Reduce ping timeout during test

Break watchdog into watchdog and storage (in-memory store)

.dockerignore

@@ -1,3 +1,5 @@
 example
+Dockerfile
 .github
 .idea
+.git

.gitattributes

@@ -0,0 +1 @@
+* text=lf

.github/codecov.yml

@@ -0,0 +1,6 @@
+ignore:
+  - "watchdog/watchdog.go"
+
+coverage:
+  status:
+    patch: off

.github/workflows/build.yml

@@ -14,14 +14,18 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - name: Set up Go 1.14
+      - name: Set up Go 1.15
         uses: actions/setup-go@v1
         with:
-          go-version: 1.14
+          go-version: 1.15
         id: go
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
       - name: Build binary to make sure it works
         run: go build -mod vendor
       - name: Test
-        run: go test -mod vendor -cover ./...
+        run: sudo go test -mod vendor ./... -race -coverprofile=coverage.txt -covermode=atomic
+      - name: Codecov
+        uses: codecov/codecov-action@v1.0.14
+        with:
+          file: ./coverage.txt

.github/workflows/publish.yml

@@ -0,0 +1,32 @@
+name: publish
+on:
+  release:
+    types: [published]
+jobs:
+  build:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+      - name: Get image repository
+        run: echo IMAGE_REPOSITORY=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+      - name: Get the release
+        run: echo RELEASE=${GITHUB_REF/refs\/tags\//} >> $GITHUB_ENV
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to Docker Registry
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build and push docker image
+        uses: docker/build-push-action@v2
+        with:
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          pull: true
+          push: true
+          tags: |
+            ${{ env.IMAGE_REPOSITORY }}:${{ env.RELEASE }}

.gitignore

@@ -1,2 +1,4 @@
 bin
-.idea
+.idea
+.vscode
+gatus

Dockerfile

@@ -1,9 +1,13 @@
 # Build the go application into a binary
 FROM golang:alpine as builder
-WORKDIR /app
-ADD . ./
-RUN CGO_ENABLED=0 GOOS=linux go build -mod vendor -a -installsuffix cgo -o gatus .
 RUN apk --update add ca-certificates
+WORKDIR /app
+COPY . ./
+RUN CGO_ENABLED=0 GOOS=linux go build -mod vendor -a -installsuffix cgo -o gatus .
+
+# Run Tests inside docker image if you don't have a configured go environment
+#RUN apk update && apk add --virtual build-dependencies build-base gcc
+#RUN go test ./... -mod vendor
 
 # Run the binary on an empty container
 FROM scratch
@@ -13,4 +17,4 @@ COPY --from=builder /app/static static/
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 ENV PORT=8080
 EXPOSE ${PORT}
-ENTRYPOINT ["/gatus"]
+ENTRYPOINT ["/gatus"]

LICENSE.md

@@ -1,201 +1,9 @@
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+MIT License
 
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+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -1,13 +1,16 @@
 ![Gatus](static/logo-with-name.png)
 
 ![build](https://github.com/TwinProduction/gatus/workflows/build/badge.svg?branch=master)
-[![Go Report Card](https://goreportcard.com/badge/github.com/TwinProduction/gatus)](https://goreportcard.com/report/github.com/TwinProduction/gatus)
+[![Go Report Card](https://goreportcard.com/badge/github.com/TwinProduction/gatus?)](https://goreportcard.com/report/github.com/TwinProduction/gatus)
+[![codecov](https://codecov.io/gh/TwinProduction/gatus/branch/master/graph/badge.svg)](https://codecov.io/gh/TwinProduction/gatus)
+[![Go version](https://img.shields.io/github/go-mod/go-version/TwinProduction/gatus.svg)](https://github.com/TwinProduction/gatus)
 [![Docker pulls](https://img.shields.io/docker/pulls/twinproduction/gatus.svg)](https://cloud.docker.com/repository/docker/twinproduction/gatus)
+[![Follow TwinProduction](https://img.shields.io/github/followers/TwinProduction?label=Follow&style=social)](https://github.com/TwinProduction)
 
 A service health dashboard in Go that is meant to be used as a docker 
 image with a custom configuration file.
 
-I personally deploy it in my Kubernetes cluster and have it monitor the status of my
+I personally deploy it in my Kubernetes cluster and let it monitor the status of my
 core applications: https://status.twinnation.org/
 
 
@@ -17,14 +20,33 @@ core applications: https://status.twinnation.org/
 - [Usage](#usage)
   - [Configuration](#configuration)
   - [Conditions](#conditions)
+    - [Placeholders](#placeholders)
+    - [Functions](#functions)
+  - [Alerting](#alerting)
+    - [Configuring Slack alerts](#configuring-slack-alerts)
+    - [Configuring PagerDuty alerts](#configuring-pagerduty-alerts)
+    - [Configuring Twilio alerts](#configuring-twilio-alerts)
+    - [Configuring Mattermost alerts](#configuring-mattermost-alerts)
+    - [Configuring Messagebird alerts](#configuring-messagebird-alerts)    
+    - [Configuring custom alerts](#configuring-custom-alerts)
+  - [Kubernetes (ALPHA)](#kubernetes-alpha)
+    - [Auto Discovery](#auto-discovery)
+    - [Deploying](#deploying)
 - [Docker](#docker)
 - [Running the tests](#running-the-tests)
 - [Using in Production](#using-in-production)
 - [FAQ](#faq)
   - [Sending a GraphQL request](#sending-a-graphql-request)
-  - [Configuring Slack alerts](#configuring-slack-alerts)
-  - [Configuring Twilio alerts](#configuring-twilio-alerts)
-  - [Configuring custom alerts](#configuring-custom-alerts)
+  - [Recommended interval](#recommended-interval)
+  - [Default timeouts](#default-timeouts)
+  - [Monitoring a TCP service](#monitoring-a-tcp-service)
+  - [Monitoring a service using ICMP](#monitoring-a-service-using-icmp)
+  - [Monitoring a service using DNS queries](#monitoring-a-service-using-dns-queries)
+  - [Basic authentication](#basic-authentication)
+  - [disable-monitoring-lock](#disable-monitoring-lock)
+  - [Service groups](#service-groups)
+  - [Exposing Gatus on a custom port](#exposing-gatus-on-a-custom-port)
+  - [Uptime Badges (ALPHA)](#uptime-badges)
 
 
 ## Features
@@ -33,9 +55,11 @@ The main features of Gatus are:
 - **Highly flexible health check conditions**: While checking the response status may be enough for some use cases, Gatus goes much further and allows you to add conditions on the response time, the response body and even the IP address.
 - **Ability to use Gatus for user acceptance tests**: Thanks to the point above, you can leverage this application to create automated user acceptance tests.
 - **Very easy to configure**: Not only is the configuration designed to be as readable as possible, it's also extremely easy to add a new service or a new endpoint to monitor.
-- **Alerting**: While having a pretty visual dashboard is useful to keep track of the state of your application(s), you probably don't want to stare at it all day. Thus, notifications via Slack are supported out of the box with the ability to configure a custom alerting provider for any needs you might have, whether it be a different provider like PagerDuty or a custom application that manages automated rollbacks. 
+- **Alerting**: While having a pretty visual dashboard is useful to keep track of the state of your application(s), you probably don't want to stare at it all day. Thus, notifications via Slack, Mattermost, Messagebird, PagerDuty and Twilio are supported out of the box with the ability to configure a custom alerting provider for any needs you might have, whether it be a different provider or a custom application that manages automated rollbacks. 
 - **Metrics**
 - **Low resource consumption**: As with most Go applications, the resource footprint that this application requires is negligibly small.
+- **GitHub uptime badges** (ALPHA): ![Uptime 1h](https://status.twinnation.org/api/v1/badges/uptime/1h/group-core-service-twinnation%20-%20external.svg) ![Uptime 24h](https://status.twinnation.org/api/v1/badges/uptime/24h/group-core-service-twinnation%20-%20external.svg) ![Uptime 7d](https://status.twinnation.org/api/v1/badges/uptime/7d/group-core-service-twinnation%20-%20external.svg)
+- **Service auto discovery in Kubernetes** (ALPHA)
 
 
 ## Usage
@@ -72,59 +96,375 @@ Note that you can also add environment variables in the configuration file (i.e.
 
 ### Configuration
 
-| Parameter                              | Description                                                     | Default        |
-| -------------------------------------- | --------------------------------------------------------------- | -------------- |
-| `debug`                                | Whether to enable debug logs                                    | `false`        |
-| `metrics`                              | Whether to expose metrics at /metrics                           | `false`        |
-| `services`                             | List of services to monitor                                     | Required `[]`  |
-| `services[].name`                      | Name of the service. Can be anything.                           | Required `""`  |
-| `services[].url`                       | URL to send the request to                                      | Required `""`  |
-| `services[].conditions`                | Conditions used to determine the health of the service          | `[]`           |
-| `services[].interval`                  | Duration to wait between every status check                     | `60s`          |
-| `services[].method`                    | Request method                                                  | `GET`          |
-| `services[].graphql`                   | Whether to wrap the body in a query param (`{"query":"$body"}`) | `false`        |
-| `services[].body`                      | Request body                                                    | `""`           |
-| `services[].headers`                   | Request headers                                                 | `{}`           |
-| `services[].alerts[].type`             | Type of alert. Valid types: `slack`, `twilio`, `custom`         | Required `""`  |
-| `services[].alerts[].enabled`          | Whether to enable the alert                                     | `false`        |
-| `services[].alerts[].threshold`        | Number of failures in a row needed before triggering the alert  | `3`            |
-| `services[].alerts[].description`      | Description of the alert. Will be included in the alert sent    | `""`           |
-| `services[].alerts[].send-on-resolved` | Whether to send a notification once a triggered alert subsides  | `false`        |
-| `alerting`                             | Configuration for alerting                                      | `{}`           |
-| `alerting.slack`                       | Webhook to use for alerts of type `slack`                       | `""`           |
-| `alerting.twilio`                      | Settings for alerts of type `twilio`                            | `""`           |
-| `alerting.twilio.sid`                  | Twilio account SID                                              | Required `""`  |
-| `alerting.twilio.token`                | Twilio auth token                                               | Required `""`  |
-| `alerting.twilio.from`                 | Number to send Twilio alerts from                               | Required `""`  |
-| `alerting.twilio.to`                   | Number to send twilio alerts to                                 | Required `""`  |
-| `alerting.custom`                      | Configuration for custom actions on failure or alerts           | `""`           |
-| `alerting.custom.url`                  | Custom alerting request url                                     | `""`           |
-| `alerting.custom.body`                 | Custom alerting request body.                                   | `""`           |
-| `alerting.custom.headers`              | Custom alerting request headers                                 | `{}`           |
+| Parameter                                | Description                                                                   | Default        |
+|:---------------------------------------- |:----------------------------------------------------------------------------- |:-------------- |
+| `debug`                                  | Whether to enable debug logs                                                  | `false`        |
+| `metrics`                                | Whether to expose metrics at /metrics                                         | `false`        |
+| `services`                               | List of services to monitor                                                   | Required `[]`  |
+| `services[].name`                        | Name of the service. Can be anything.                                         | Required `""`  |
+| `services[].group`                       | Group name. Used to group multiple services together on the dashboard. See [Service groups](#service-groups). | `""`           |
+| `services[].url`                         | URL to send the request to                                                    | Required `""`  |
+| `services[].method`                      | Request method                                                                | `GET`          |
+| `services[].insecure`                    | Whether to skip verifying the server's certificate chain and host name        | `false`        |
+| `services[].conditions`                  | Conditions used to determine the health of the service                        | `[]`           |
+| `services[].interval`                    | Duration to wait between every status check                                   | `60s`          |
+| `services[].graphql`                     | Whether to wrap the body in a query param (`{"query":"$body"}`)               | `false`        |
+| `services[].body`                        | Request body                                                                  | `""`           |
+| `services[].headers`                     | Request headers                                                               | `{}`           |
+| `services[].dns`                         | Configuration for a service of type DNS. See [Monitoring using DNS queries](#monitoring-using-dns-queries)  | `""`           |
+| `services[].dns.query-type`              | Query type for DNS service                                                    | `""`           |
+| `services[].dns.query-name`              | Query name for DNS service                                                    | `""`           |
+| `services[].alerts[].type`               | Type of alert. Valid types: `slack`, `pagerduty`, `twilio`, `mattermost`, `messagebird`, `custom` | Required `""`  |
+| `services[].alerts[].enabled`            | Whether to enable the alert                                                   | `false`        |
+| `services[].alerts[].failure-threshold`  | Number of failures in a row needed before triggering the alert                | `3`            |
+| `services[].alerts[].success-threshold`  | Number of successes in a row before an ongoing incident is marked as resolved | `2`            |
+| `services[].alerts[].send-on-resolved`   | Whether to send a notification once a triggered alert is marked as resolved   | `false`        |
+| `services[].alerts[].description`        | Description of the alert. Will be included in the alert sent                  | `""`           |
+| `alerting`                               | Configuration for alerting                                                    | `{}`           |
+| `alerting.slack`                         | Configuration for alerts of type `slack`                                      | `{}`           |
+| `alerting.slack.webhook-url`             | Slack Webhook URL                                                             | Required `""`  |
+| `alerting.pagerduty`                     | Configuration for alerts of type `pagerduty`                                  | `{}`           |
+| `alerting.pagerduty.integration-key`     | PagerDuty Events API v2 integration key.                                      | Required `""`  |
+| `alerting.twilio`                        | Settings for alerts of type `twilio`                                          | `{}`           |
+| `alerting.twilio.sid`                    | Twilio account SID                                                            | Required `""`  |
+| `alerting.twilio.token`                  | Twilio auth token                                                             | Required `""`  |
+| `alerting.twilio.from`                   | Number to send Twilio alerts from                                             | Required `""`  |
+| `alerting.twilio.to`                     | Number to send twilio alerts to                                               | Required `""`  |
+| `alerting.mattermost`                    | Configuration for alerts of type `mattermost`                                 | `{}`           |
+| `alerting.mattermost.webhook-url`        | Mattermost Webhook URL                                                        | Required `""`  |
+| `alerting.mattermost.insecure`           | Whether to skip verifying the server's certificate chain and host name        | `false`        |
+| `alerting.messagebird`                   | Settings for alerts of type `messagebird`                                     | `{}`           |
+| `alerting.messagebird.access-key`        | Messagebird access key                                                        | Required `""`  |
+| `alerting.messagebird.originator`        | The sender of the message                                                     | Required `""`  |
+| `alerting.messagebird.recipients`        | The recipients of the message                                                 | Required `""`  |
+| `alerting.custom`                        | Configuration for custom actions on failure or alerts                         | `{}`           |
+| `alerting.custom.url`                    | Custom alerting request url                                                   | Required `""`  |
+| `alerting.custom.method`                 | Request method                                                                | `GET`          |
+| `alerting.custom.insecure`               | Whether to skip verifying the server's certificate chain and host name        | `false`        |
+| `alerting.custom.body`                   | Custom alerting request body.                                                 | `""`           |
+| `alerting.custom.headers`                | Custom alerting request headers                                               | `{}`           |
+| `security`                               | Security configuration                                                        | `{}`           |
+| `security.basic`                         | Basic authentication security configuration                                   | `{}`           |
+| `security.basic.username`                | Username for Basic authentication                                             | Required `""`  |
+| `security.basic.password-sha512`         | Password's SHA512 hash for Basic authentication                               | Required `""`  |
+| `disable-monitoring-lock`                | Whether to [disable the monitoring lock](#disable-monitoring-lock)            | `false`        |
+| `web`                                    | Web configuration                                                             | `{}`           |
+| `web.address`                            | Address to listen on                                                          | `0.0.0.0`      |
+| `web.port`                               | Port to listen on                                                             | `8080`         |
+| `web.context-root`                       | Context root at which Gatus will be exposed (frontend and backend)            | `/`            |
+
+For Kubernetes configuration, see [Kubernetes](#kubernetes-alpha)
 
 
 ### Conditions
 
 Here are some examples of conditions you can use:
 
-| Condition                    | Description                                             | Passing values           | Failing values |
-| -----------------------------| ------------------------------------------------------- | ------------------------ | -------------- |
-| `[STATUS] == 200`            | Status must be equal to 200                             | 200                      | 201, 404, ...  |
-| `[STATUS] < 300`             | Status must lower than 300                              | 200, 201, 299            | 301, 302, ...  |
-| `[STATUS] <= 299`            | Status must be less than or equal to 299                | 200, 201, 299            | 301, 302, ...  |
-| `[STATUS] > 400`             | Status must be greater than 400                         | 401, 402, 403, 404       | 400, 200, ...  |
-| `[RESPONSE_TIME] < 500`      | Response time must be below 500ms                       | 100ms, 200ms, 300ms      | 500ms, 501ms   |
-| `[BODY] == 1`                | The body must be equal to 1                             | 1                        | Anything else  |
-| `[BODY].data.id == 1`        | The jsonpath `$.data.id` is equal to 1                  | `{"data":{"id":1}}`      |  |
-| `[BODY].data[0].id == 1`     | The jsonpath `$.data[0].id` is equal to 1               | `{"data":[{"id":1}]}`    |  |
-| `len([BODY].data) > 0`       | Array at jsonpath `$.data` has less than 5 elements     | `{"data":[{"id":1}]}`    |  |
-| `len([BODY].name) == 8`      | String at jsonpath `$.name` has a length of 8           | `{"name":"john.doe"}`    | `{"name":"bob"}` |
+| Condition                    | Description                                             | Passing values             | Failing values |
+|:-----------------------------|:------------------------------------------------------- |:-------------------------- | -------------- |
+| `[STATUS] == 200`            | Status must be equal to 200                             | 200                        | 201, 404, ...  |
+| `[STATUS] < 300`             | Status must lower than 300                              | 200, 201, 299              | 301, 302, ...  |
+| `[STATUS] <= 299`            | Status must be less than or equal to 299                | 200, 201, 299              | 301, 302, ...  |
+| `[STATUS] > 400`             | Status must be greater than 400                         | 401, 402, 403, 404         | 400, 200, ...  |
+| `[CONNECTED] == true`        | Connection to host must've been successful              | true, false                |  |
+| `[RESPONSE_TIME] < 500`      | Response time must be below 500ms                       | 100ms, 200ms, 300ms        | 500ms, 501ms   |
+| `[IP] == 127.0.0.1`          | Target IP must be 127.0.0.1                             | 127.0.0.1                  | 0.0.0.0        |
+| `[BODY] == 1`                | The body must be equal to 1                             | 1                          | `{}`, `2`, ... |
+| `[BODY].user.name == john`   | JSONPath value of `$.user.name` is equal to `john`      | `{"user":{"name":"john"}}` |  |
+| `[BODY].data[0].id == 1`     | JSONPath value of `$.data[0].id` is equal to 1          | `{"data":[{"id":1}]}`      |  |
+| `[BODY].age == [BODY].id`    | JSONPath value of `$.age` is equal JSONPath `$.id`      | `{"age":1,"id":1}`         |  |
+| `len([BODY].data) < 5`       | Array at JSONPath `$.data` has less than 5 elements     | `{"data":[{"id":1}]}`      |  |
+| `len([BODY].name) == 8`      | String at JSONPath `$.name` has a length of 8           | `{"name":"john.doe"}`      | `{"name":"bob"}` |
+| `[BODY].name == pat(john*)`  | String at JSONPath `$.name` matches pattern `john*`     | `{"name":"john.doe"}`      | `{"name":"bob"}` |
+| `[CERTIFICATE_EXPIRATION] > 48h` | Certificate expiration is more than 48h away        | 49h, 50h, 123h             | 1h, 24h, ... |
+
+
+#### Placeholders
+
+| Placeholder                | Description                                                     | Example of resolved value |
+|:-------------------------- |:--------------------------------------------------------------- |:------------------------- |
+| `[STATUS]`                 | Resolves into the HTTP status of the request                    | 404
+| `[RESPONSE_TIME]`          | Resolves into the response time the request took, in ms         | 10
+| `[IP]`                     | Resolves into the IP of the target host                         | 192.168.0.232
+| `[BODY]`                   | Resolves into the response body. Supports JSONPath.             | `{"name":"john.doe"}`
+| `[CONNECTED]`              | Resolves into whether a connection could be established         | `true`
+| `[CERTIFICATE_EXPIRATION]` | Resolves into the duration before certificate expiration        | `24h`, `48h`, 0 (if not using HTTPS)
+| `[DNS_RCODE]`              | Resolves into the DNS status of the response                    | NOERROR
+
+
+#### Functions
+
+| Function   | Description                                                                                                      | Example                    |
+|:-----------|:---------------------------------------------------------------------------------------------------------------- |:-------------------------- |
+| `len`      | Returns the length of the object/slice. Works only with the `[BODY]` placeholder.                                | `len([BODY].username) > 8`
+| `pat`      | Specifies that the string passed as parameter should be evaluated as a pattern. Works only with `==` and `!=`.   | `[IP] == pat(192.168.*)`
+
+**NOTE**: Use `pat` only when you need to. `[STATUS] == pat(2*)` is a lot more expensive than `[STATUS] < 300`.
+
+
+### Alerting
+
+
+#### Configuring Slack alerts
+
+```yaml
+alerting:
+  slack: 
+    webhook-url: "https://hooks.slack.com/services/**********/**********/**********"
+services:
+  - name: twinnation
+    url: "https://twinnation.org/health"
+    interval: 30s
+    alerts:
+      - type: slack
+        enabled: true
+        description: "healthcheck failed 3 times in a row"
+        send-on-resolved: true
+      - type: slack
+        enabled: true
+        failure-threshold: 5
+        description: "healthcheck failed 5 times in a row"
+        send-on-resolved: true
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+Here's an example of what the notifications look like:
+
+![Slack notifications](.github/assets/slack-alerts.png)
+
+
+#### Configuring PagerDuty alerts
+
+It is highly recommended to set `services[].alerts[].send-on-resolved` to `true` for alerts 
+of type `pagerduty`, because unlike other alerts, the operation resulting from setting said 
+parameter to `true` will not create another incident, but mark the incident as resolved on 
+PagerDuty instead. 
+
+```yaml
+alerting:
+  pagerduty: 
+    integration-key: "********************************"
+services:
+  - name: twinnation
+    url: "https://twinnation.org/health"
+    interval: 30s
+    alerts:
+      - type: pagerduty
+        enabled: true
+        failure-threshold: 3
+        success-threshold: 5
+        send-on-resolved: true
+        description: "healthcheck failed 3 times in a row"
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+
+#### Configuring Twilio alerts
+
+```yaml
+alerting:
+  twilio:
+    sid: "..."
+    token: "..."
+    from: "+1-234-567-8901"
+    to: "+1-234-567-8901"
+services:
+  - name: twinnation
+    interval: 30s
+    url: "https://twinnation.org/health"
+    alerts:
+      - type: twilio
+        enabled: true
+        failure-threshold: 5
+        send-on-resolved: true
+        description: "healthcheck failed 5 times in a row"
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+
+#### Configuring Mattermost alerts
+
+```yaml
+alerting:
+  mattermost: 
+    webhook-url: "http://**********/hooks/**********"
+    insecure: true
+services:
+  - name: twinnation
+    url: "https://twinnation.org/health"
+    interval: 30s
+    alerts:
+      - type: mattermost
+        enabled: true
+        description: "healthcheck failed 3 times in a row"
+        send-on-resolved: true
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+Here's an example of what the notifications look like:
+
+![Mattermost notifications](.github/assets/mattermost-alerts.png)
+
+
+#### Configuring Messagebird alerts
+
+Example of sending **SMS** text message alert using Messagebird:
+
+```yaml
+alerting:
+  messagebird:
+    access-key: "..."
+    originator: "31619191918"
+    recipients: "31619191919,31619191920"
+services:
+  - name: twinnation
+    interval: 30s
+    url: "https://twinnation.org/health"
+    alerts:
+      - type: messagebird
+        enabled: true
+        failure-threshold: 3
+        send-on-resolved: true
+        description: "healthcheck failed 3 times in a row"
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+
+#### Configuring custom alerts
+
+While they're called alerts, you can use this feature to call anything. 
+
+For instance, you could automate rollbacks by having an application that keeps tracks of new deployments, and by 
+leveraging Gatus, you could have Gatus call that application endpoint when a service starts failing. Your application
+would then check if the service that started failing was recently deployed, and if it was, then automatically 
+roll it back.
+
+The values `[ALERT_DESCRIPTION]` and `[SERVICE_NAME]` are automatically substituted for the alert description and the 
+service name respectively in the body (`alerting.custom.body`) as well as the url (`alerting.custom.url`).
+
+If you have `send-on-resolved` set to `true`, you may want to use `[ALERT_TRIGGERED_OR_RESOLVED]` to differentiate
+the notifications. It will be replaced for either `TRIGGERED` or `RESOLVED`, based on the situation.
+
+For all intents and purpose, we'll configure the custom alert with a Slack webhook, but you can call anything you want.
+
+```yaml
+alerting:
+  custom:
+    url: "https://hooks.slack.com/services/**********/**********/**********"
+    method: "POST"
+    insecure: true
+    body: |
+      {
+        "text": "[ALERT_TRIGGERED_OR_RESOLVED]: [SERVICE_NAME] - [ALERT_DESCRIPTION]"
+      }
+services:
+  - name: twinnation
+    url: "https://twinnation.org/health"
+    interval: 30s
+    alerts:
+      - type: custom
+        enabled: true
+        failure-threshold: 10
+        success-threshold: 3
+        send-on-resolved: true
+        description: "healthcheck failed 10 times in a row"
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+### Kubernetes (ALPHA)
+
+> **WARNING**: This feature is in ALPHA. This means that it is very likely to change in the near future, which means that
+> while you can use this feature as you see fit, there may be breaking changes in future releases.
+
+| Parameter                                   | Description                                                                   | Default        |
+|:------------------------------------------- |:----------------------------------------------------------------------------- |:-------------- |
+| `kubernetes`                                | Kubernetes configuration                                                      | `{}`           |
+| `kubernetes.auto-discover`                  | Whether to enable auto discovery                                              | `false`        |
+| `kubernetes.cluster-mode`                   | Cluster mode to use for authenticating. Supported values: `in`, `out`         | Required `""`  |
+| `kubernetes.service-template`               | Service template. See `services[]` in [Configuration](#configuration)         | Required `nil` |
+| `kubernetes.excluded-service-suffixes`      | List of service suffixes to not monitor (e.g. `canary`)                       | `[]`           |
+| `kubernetes.namespaces`                     | List of configurations for the namespaces from which services will be discovered | `[]`        |
+| `kubernetes.namespaces[].name`              | Namespace name                                                                | Required `""`  |
+| `kubernetes.namespaces[].hostname-suffix`   | Suffix to append to the service name before calling `target-path`             | Required `""`  |
+| `kubernetes.namespaces[].target-path`       | Path that will be called on the discovered service for the health check       | `""`           |
+| `kubernetes.namespaces[].excluded-services` | List of services to not monitor in the given namespace                        | `[]`           |
+
+
+#### Auto Discovery
+
+Auto discovery works by reading all `Service` resources from the configured `namespaces` and appending the `hostname-suffix` as 
+well as the configured `target-path` to the service name and making an HTTP call.
+
+All auto-discovered services will have the service configuration populated from the `service-template`.
+
+You can exclude certain services from the dashboard by using `kubernetes.excluded-service-suffixes` or `kubernetes.namespaces[].excluded-services`.
+
+```yaml
+kubernetes:
+  auto-discover: true
+  # out: Gatus is deployed outside of the K8s cluster.
+  # in: Gatus is deployed in the K8s cluster
+  cluster-mode: "out"                                              
+  excluded-service-suffixes:
+    - canary
+  service-template:
+    interval: 30s
+    conditions:
+      - "[STATUS] == 200"
+  namespaces:
+    - name: default
+      # If cluster-mode is out, you should use an externally accessible hostname suffix (e.g.. .example.com)
+      # This will result in gatus generating services with URLs like <service-name>.example.com
+      # If cluster-mode is in, you can use either an externally accessible hostname suffix (e.g.. .example.com)
+      # or an internally accessible hostname suffix (e.g. .default.svc.cluster.local)
+      hostname-suffix: ".default.svc.cluster.local"
+      target-path: "/health"
+      # If some services cannot be or do not need to be monitored, you can exclude them by explicitly defining them
+      # in the following list.
+      excluded-services:
+        - gatus
+        - kubernetes
+```
+
+Note that `hostname-suffix` could also be something like `.yourdomain.com`, in which case the endpoint that would be 
+monitored would be `potato.example.com/health`, assuming you have a service named `potato` and a matching ingress
+to map `potato.example.com` to the `potato` service.
+
+#### Deploying
+
+See [example/kubernetes-with-auto-discovery](example/kubernetes-with-auto-discovery)
 
 
 ## Docker
 
+Other than using one of the examples provided in the `examples` folder, you can also try it out locally by 
+creating a configuration file - we'll call it `config.yaml` for this example - and running the following 
+command:
 ```
-docker run -p 8080:8080 --name gatus twinproduction/gatus
+docker run -p 8080:8080 --mount type=bind,source="$(pwd)"/config.yaml,target=/config/config.yaml --name gatus twinproduction/gatus
+```
+
+If you're on Windows, replace `"$(pwd)"` by the absolute path to your current directory, e.g.:
+```
+docker run -p 8080:8080 --mount type=bind,source=C:/Users/Chris/Desktop/config.yaml,target=/config/config.yaml --name gatus twinproduction/gatus
 ```
 
 
@@ -163,7 +503,7 @@ services:
         }
       }
     headers:
-      Content-Type: application/json
+      Content-Type: application/json # XXX: as of v1.9.2, this header is automatically added when graphql is set to true
     conditions:
       - "[STATUS] == 200"
       - "[BODY].data.user[0].gender == female"
@@ -175,99 +515,227 @@ will send a `POST` request to `http://localhost:8080/playground` with the follow
 ```
 
 
-### Configuring Slack alerts
+### Recommended interval
+
+**NOTE**: This does not _really_ apply if `disable-monitoring-lock` is set to `true`, as the monitoring lock is what
+tells Gatus to only evaluate one service at a time.
+
+To ensure that Gatus provides reliable and accurate results (i.e. response time), Gatus only evaluates one service at a time
+In other words, even if you have multiple services with the exact same interval, they will not execute at the same time.
+
+You can test this yourself by running Gatus with several services configured with a very short, unrealistic interval, 
+such as 1ms. You'll notice that the response time does not fluctuate - that is because while services are evaluated on
+different goroutines, there's a global lock that prevents multiple services from running at the same time.
+
+Unfortunately, there is a drawback. If you have a lot of services, including some that are very slow or prone to time out (the default
+time out is 10s for HTTP and 5s for TCP), then it means that for the entire duration of the request, no other services can be evaluated.
+
+**This does mean that Gatus will be unable to evaluate the health of other services**. 
+The interval does not include the duration of the request itself, which means that if a service has an interval of 30s 
+and the request takes 2s to complete, the timestamp between two evaluations will be 32s, not 30s. 
+
+While this does not prevent Gatus' from performing health checks on all other services, it may cause Gatus to be unable 
+to respect the configured interval, for instance:
+- Service A has an interval of 5s, and times out after 10s to complete 
+- Service B has an interval of 5s, and takes 1ms to complete
+- Service B will be unable to run every 5s, because service A's health evaluation takes longer than its interval
+
+To sum it up, while Gatus can really handle any interval you throw at it, you're better off having slow requests with 
+higher interval.
+
+As a rule of the thumb, I personally set interval for more complex health checks to `5m` (5 minutes) and 
+simple health checks used for alerting (PagerDuty/Twilio) to `30s`.
+
+
+### Default timeouts
+
+| Protocol | Timeout |
+|:-------- |:------- |
+| HTTP     | 10s
+| TCP      | 5s
+
+
+### Monitoring a TCP service
+
+By prefixing `services[].url` with `tcp:\\`, you can monitor TCP services at a very basic level:
 
 ```yaml
-alerting:
-  slack: "https://hooks.slack.com/services/**********/**********/**********"
 services:
-  - name: twinnation
+  - name: redis
+    url: "tcp://127.0.0.1:6379"
     interval: 30s
-    url: "https://twinnation.org/health"
-    alerts:
-      - type: slack
-        enabled: true
-        description: "healthcheck failed 3 times in a row"
-        send-on-resolved: true
-      - type: slack
-        enabled: true
-        threshold: 5
-        description: "healthcheck failed 5 times in a row"
-        send-on-resolved: true
     conditions:
-      - "[STATUS] == 200"
-      - "[BODY].status == UP"
-      - "[RESPONSE_TIME] < 300"
+      - "[CONNECTED] == true"
 ```
 
-Here's an example of what the notifications look like:
+Placeholders `[STATUS]` and `[BODY]` as well as the fields `services[].body`, `services[].insecure`, 
+`services[].headers`, `services[].method` and `services[].graphql` are not supported for TCP services.
 
-![Slack notifications](.github/assets/slack-alerts.png)
+**NOTE**: `[CONNECTED] == true` does not guarantee that the service itself is healthy - it only guarantees that there's 
+something at the given address listening to the given port, and that a connection to that address was successfully 
+established.
 
 
-### Configuring Twilio alerts
+### Monitoring a service using ICMP
+
+By prefixing `services[].url` with `icmp:\\`, you can monitor services at a very basic level using ICMP, or more 
+commonly known as "ping" or "echo":
 
 ```yaml
-alerting:
-  twilio:
-    sid: "..."
-    token: "..."
-    from: "+1-234-567-8901"
-    to: "+1-234-567-8901"
 services:
-  - name: twinnation
-    interval: 30s
-    url: "https://twinnation.org/health"
-    alerts:
-      - type: twilio
-        enabled: true
-        threshold: 5
-        description: "healthcheck failed 5 times in a row"
+  - name: ICMP
+    url: "icmp://example.com"
     conditions:
-      - "[STATUS] == 200"
-      - "[BODY].status == UP"
-      - "[RESPONSE_TIME] < 300"
+      - "[CONNECTED] == true"
 ```
 
+Only the placeholders `[CONNECTED]`, `[IP]` and `[RESPONSE_TIME]` are supported for services of type ICMP.
+You can specify a domain prefixed by `icmp://`, or an IP address prefixed by `icmp://`.
 
-### Configuring custom alerts
 
-While they're called alerts, you can use this feature to call anything. 
+### Monitoring a service using DNS queries
 
-For instance, you could automate rollbacks by having an application that keeps tracks of new deployments, and by 
-leveraging Gatus, you could have Gatus call that application endpoint when a service starts failing. Your application
-would then check if the service that started failing was recently deployed, and if it was, then automatically 
-roll it back.
+Defining a `dns` configuration in a service will automatically mark that service as a service of type DNS:
+```yaml
+services:
+  - name: example dns query
+    url: "8.8.8.8" # Address of the DNS server to use
+    interval: 30s
+    dns:
+      query-name: "example.com"
+      query-type: "A"
+    conditions:
+      - "[BODY] == 93.184.216.34"
+      - "[DNS_RCODE] == NOERROR"
+```
 
-The values `[ALERT_DESCRIPTION]` and `[SERVICE_NAME]` are automatically substituted for the alert description and the 
-service name respectively in the body (`alerting.custom.body`) as well as the url (`alerting.custom.url`).
+There are two placeholders that can be used in the conditions for services of type DNS:
+- The placeholder `[BODY]` resolves to the output of the query. For instance, a query of type `A` would return an IPv4.
+- The placeholder `[DNS_RCODE]` resolves to the name associated to the response code returned by the query, such as 
+`NOERROR`, `FORMERR`, `SERVFAIL`, `NXDOMAIN`, etc.
 
-If you have `send-on-resolved` set to `true`, you may want to use `[ALERT_TRIGGERED_OR_RESOLVED]` to differentiate
-the notifications. It will be replaced for either `TRIGGERED` or `RESOLVED`, based on the situation.
 
-For all intents and purpose, we'll configure the custom alert with a Slack webhook, but you can call anything you want.
+### Basic authentication
+
+You can require Basic authentication by leveraging the `security.basic` configuration:
+
+```yaml
+security:
+  basic:
+    username: "john.doe"
+    password-sha512: "6b97ed68d14eb3f1aa959ce5d49c7dc612e1eb1dafd73b1e705847483fd6a6c809f2ceb4e8df6ff9984c6298ff0285cace6614bf8daa9f0070101b6c89899e22"
+```
+
+The example above will require that you authenticate with the username `john.doe` as well as the password `hunter2`.
+
+
+### disable-monitoring-lock
+
+Setting `disable-monitoring-lock` to `true` means that multiple services could be monitored at the same time.
+
+While this behavior wouldn't generally be harmful, conditions using the `[RESPONSE_TIME]` placeholder could be impacted 
+by the evaluation of multiple services at the same time, therefore, the default value for this parameter is `false`.
+
+There are three main reasons why you might want to disable the monitoring lock:
+- You're using Gatus for load testing (each services are periodically evaluated on a different goroutine, so 
+technically, if you create 100 services with a 1 seconds interval, Gatus will send 100 requests per second)
+- You have a _lot_ of services to monitor
+- You want to test multiple services at very short interval (< 5s)
+
+
+### Service groups
+
+Service groups are used for grouping multiple services together on the dashboard.
 
 ```yaml
-alerting:
-  custom:
-    url: "https://hooks.slack.com/services/**********/**********/**********"
-    method: "POST"
-    body: |
-      {
-        "text": "[ALERT_TRIGGERED_OR_RESOLVED]: [SERVICE_NAME] - [ALERT_DESCRIPTION]"
-      }
 services:
-  - name: twinnation
-    interval: 30s
-    url: "https://twinnation.org/health"
-    alerts:
-      - type: custom
-        enabled: true
-        threshold: 10
-        send-on-resolved: true
-        description: "healthcheck failed 10 times in a row"
+  - name: frontend
+    group: core
+    url: "https://example.org/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - name: backend
+    group: core
+    url: "https://example.org/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - name: monitoring
+    group: internal
+    url: "https://example.org/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - name: nas
+    group: internal
+    url: "https://example.org/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - name: random service that isn't part of a group
+    url: "https://example.org/"
+    interval: 5m
     conditions:
       - "[STATUS] == 200"
-      - "[BODY].status == UP"
-      - "[RESPONSE_TIME] < 300"
 ```
+
+The configuration above will result in a dashboard that looks like this:
+
+![Gatus Service Groups](.github/assets/service-groups.png)
+
+
+### Exposing Gatus on a custom port
+
+By default, Gatus is exposed on port `8080`, but you may specify a different port by setting the `web.port` parameter:
+```yaml
+web:
+  port: 8081
+```
+
+If you're using a PaaS like Heroku that doesn't let you set a custom port and exposes it through an environment
+variable instead, you can use that environment variable directly in the configuration file:
+```yaml
+web:
+  port: ${PORT}
+```
+
+### Uptime badges
+![Uptime 1h](https://status.twinnation.org/api/v1/badges/uptime/1h/group-core-service-twinnation%20-%20external.svg)
+![Uptime 24h](https://status.twinnation.org/api/v1/badges/uptime/24h/group-core-service-twinnation%20-%20external.svg)
+![Uptime 7d](https://status.twinnation.org/api/v1/badges/uptime/7d/group-core-service-twinnation%20-%20external.svg)
+
+> **NOTE**: This feature is currently in ALPHA
+
+Gatus can automatically generate a SVG badge for one of your monitored services.
+This allows you to put badges in your individual services' README or even create your own status page, if you 
+desire.
+
+The endpoint to generate a badge is the following:
+```
+/api/v1/badges/uptime/{duration}/{identifier}.svg
+```
+Where:
+- `{duration}` is `7d`, `24h` or `1h`
+- `{identifier}` has the following pattern: `group-<GROUP_NAME>-service-<SERVICE_NAME>.svg`
+
+For instance, if you want the uptime during the last 24 hours from the service `frontend` in the group `core`, 
+the URL would look like this:
+```
+http://example.com/api/v1/badges/uptime/7d/group-core-service-frontend.svg
+```
+
+If you want to display a service that is not part of a group, you must leave the group value empty:
+```
+http://example.com/api/v1/badges/uptime/7d/group--service-frontend.svg
+```
+
+Example: ![Uptime 24h](https://status.twinnation.org/api/v1/badges/uptime/24h/group-core-service-twinnation%20-%20external.svg)
+```
+![Uptime 24h](https://status.twinnation.org/api/v1/badges/uptime/24h/group-core-service-twinnation%20-%20external.svg)
+```
+

alerting/config.go

@@ -0,0 +1,31 @@
+package alerting
+
+import (
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/alerting/provider/mattermost"
+	"github.com/TwinProduction/gatus/alerting/provider/messagebird"
+	"github.com/TwinProduction/gatus/alerting/provider/pagerduty"
+	"github.com/TwinProduction/gatus/alerting/provider/slack"
+	"github.com/TwinProduction/gatus/alerting/provider/twilio"
+)
+
+// Config is the configuration for alerting providers
+type Config struct {
+	// Slack is the configuration for the slack alerting provider
+	Slack *slack.AlertProvider `yaml:"slack"`
+
+	// Mattermost is the configuration for the mattermost alerting provider
+	Mattermost *mattermost.AlertProvider `yaml:"mattermost"`
+
+	// Messagebird is the configuration for the messagebird alerting provider
+	Messagebird *messagebird.AlertProvider `yaml:"messagebird"`
+
+	// Pagerduty is the configuration for the pagerduty alerting provider
+	PagerDuty *pagerduty.AlertProvider `yaml:"pagerduty"`
+
+	// Twilio is the configuration for the twilio alerting provider
+	Twilio *twilio.AlertProvider `yaml:"twilio"`
+
+	// Custom is the configuration for the custom alerting provider
+	Custom *custom.AlertProvider `yaml:"custom"`
+}

alerting/provider/custom/custom.go

@@ -0,0 +1,94 @@
+package custom
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/TwinProduction/gatus/client"
+	"github.com/TwinProduction/gatus/core"
+)
+
+// AlertProvider is the configuration necessary for sending an alert using a custom HTTP request
+// Technically, all alert providers should be reachable using the custom alert provider
+type AlertProvider struct {
+	URL      string            `yaml:"url"`
+	Method   string            `yaml:"method,omitempty"`
+	Insecure bool              `yaml:"insecure,omitempty"`
+	Body     string            `yaml:"body,omitempty"`
+	Headers  map[string]string `yaml:"headers,omitempty"`
+}
+
+// IsValid returns whether the provider's configuration is valid
+func (provider *AlertProvider) IsValid() bool {
+	return len(provider.URL) > 0
+}
+
+// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, alert *core.Alert, result *core.Result, resolved bool) *AlertProvider {
+	return provider
+}
+
+func (provider *AlertProvider) buildHTTPRequest(serviceName, alertDescription string, resolved bool) *http.Request {
+	body := provider.Body
+	providerURL := provider.URL
+	method := provider.Method
+	if strings.Contains(body, "[ALERT_DESCRIPTION]") {
+		body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alertDescription)
+	}
+	if strings.Contains(body, "[SERVICE_NAME]") {
+		body = strings.ReplaceAll(body, "[SERVICE_NAME]", serviceName)
+	}
+	if strings.Contains(body, "[ALERT_TRIGGERED_OR_RESOLVED]") {
+		if resolved {
+			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", "RESOLVED")
+		} else {
+			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", "TRIGGERED")
+		}
+	}
+	if strings.Contains(providerURL, "[ALERT_DESCRIPTION]") {
+		providerURL = strings.ReplaceAll(providerURL, "[ALERT_DESCRIPTION]", alertDescription)
+	}
+	if strings.Contains(providerURL, "[SERVICE_NAME]") {
+		providerURL = strings.ReplaceAll(providerURL, "[SERVICE_NAME]", serviceName)
+	}
+	if strings.Contains(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]") {
+		if resolved {
+			providerURL = strings.ReplaceAll(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]", "RESOLVED")
+		} else {
+			providerURL = strings.ReplaceAll(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]", "TRIGGERED")
+		}
+	}
+	if len(method) == 0 {
+		method = http.MethodGet
+	}
+	bodyBuffer := bytes.NewBuffer([]byte(body))
+	request, _ := http.NewRequest(method, providerURL, bodyBuffer)
+	for k, v := range provider.Headers {
+		request.Header.Set(k, v)
+	}
+	return request
+}
+
+// Send a request to the alert provider and return the body
+func (provider *AlertProvider) Send(serviceName, alertDescription string, resolved bool) ([]byte, error) {
+	if os.Getenv("MOCK_ALERT_PROVIDER") == "true" {
+		return []byte("{}"), nil
+	}
+	request := provider.buildHTTPRequest(serviceName, alertDescription, resolved)
+	response, err := client.GetHTTPClient(provider.Insecure).Do(request)
+	if err != nil {
+		return nil, err
+	}
+	if response.StatusCode > 399 {
+		body, err := ioutil.ReadAll(response.Body)
+		if err != nil {
+			return nil, fmt.Errorf("call to provider alert returned status code %d", response.StatusCode)
+		}
+		return nil, fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return ioutil.ReadAll(response.Body)
+}

alerting/provider/custom/custom_test.go

@@ -0,0 +1,70 @@
+package custom
+
+import (
+	"io/ioutil"
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+func TestAlertProvider_IsValid(t *testing.T) {
+	invalidProvider := AlertProvider{URL: ""}
+	if invalidProvider.IsValid() {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{URL: "http://example.com"}
+	if !validProvider.IsValid() {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_buildHTTPRequestWhenResolved(t *testing.T) {
+	const (
+		ExpectedURL  = "http://example.com/service-name?event=RESOLVED&description=alert-description"
+		ExpectedBody = "service-name,alert-description,RESOLVED"
+	)
+	customAlertProvider := &AlertProvider{
+		URL:     "http://example.com/[SERVICE_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+		Body:    "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+		Headers: nil,
+	}
+	request := customAlertProvider.buildHTTPRequest("service-name", "alert-description", true)
+	if request.URL.String() != ExpectedURL {
+		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
+	}
+	body, _ := ioutil.ReadAll(request.Body)
+	if string(body) != ExpectedBody {
+		t.Error("expected body to be", ExpectedBody, "was", string(body))
+	}
+}
+
+func TestAlertProvider_buildHTTPRequestWhenTriggered(t *testing.T) {
+	const (
+		ExpectedURL  = "http://example.com/service-name?event=TRIGGERED&description=alert-description"
+		ExpectedBody = "service-name,alert-description,TRIGGERED"
+	)
+	customAlertProvider := &AlertProvider{
+		URL:     "http://example.com/[SERVICE_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+		Body:    "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+		Headers: map[string]string{"Authorization": "Basic hunter2"},
+	}
+	request := customAlertProvider.buildHTTPRequest("service-name", "alert-description", false)
+	if request.URL.String() != ExpectedURL {
+		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
+	}
+	body, _ := ioutil.ReadAll(request.Body)
+	if string(body) != ExpectedBody {
+		t.Error("expected body to be", ExpectedBody, "was", string(body))
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProvider(t *testing.T) {
+	provider := AlertProvider{URL: "http://example.com"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, true)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if customAlertProvider != customAlertProvider {
+		t.Error("customAlertProvider should've been equal to customAlertProvider")
+	}
+}

alerting/provider/mattermost/mattermost.go

@@ -0,0 +1,75 @@
+package mattermost
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/core"
+)
+
+// AlertProvider is the configuration necessary for sending an alert using Mattermost
+type AlertProvider struct {
+	WebhookURL string `yaml:"webhook-url"`
+	Insecure   bool   `yaml:"insecure,omitempty"`
+}
+
+// IsValid returns whether the provider's configuration is valid
+func (provider *AlertProvider) IsValid() bool {
+	return len(provider.WebhookURL) > 0
+}
+
+// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, alert *core.Alert, result *core.Result, resolved bool) *custom.AlertProvider {
+	var message string
+	var color string
+	if resolved {
+		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", service.Name, alert.SuccessThreshold)
+		color = "#36A64F"
+	} else {
+		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", service.Name, alert.FailureThreshold)
+		color = "#DD0000"
+	}
+	var results string
+	for _, conditionResult := range result.ConditionResults {
+		var prefix string
+		if conditionResult.Success {
+			prefix = ":white_check_mark:"
+		} else {
+			prefix = ":x:"
+		}
+		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+	}
+	return &custom.AlertProvider{
+		URL:      provider.WebhookURL,
+		Method:   http.MethodPost,
+		Insecure: provider.Insecure,
+		Body: fmt.Sprintf(`{
+  "text": "",
+  "username": "gatus",
+  "icon_url": "https://raw.githubusercontent.com/TwinProduction/gatus/master/static/logo.png",
+  "attachments": [
+    {
+      "title": ":rescue_worker_helmet: Gatus",
+      "fallback": "Gatus - %s",
+      "text": "%s:\n> %s",
+      "short": false,
+      "color": "%s",
+      "fields": [
+        {
+          "title": "URL",
+          "value": "%s",
+          "short": false
+        },
+        {
+          "title": "Condition results",
+          "value": "%s",
+          "short": false
+        }
+      ]
+    }
+  ]
+}`, message, message, alert.Description, color, service.URL, results),
+		Headers: map[string]string{"Content-Type": "application/json"},
+	}
+}

alerting/provider/mattermost/mattermost_test.go

@@ -0,0 +1,41 @@
+package mattermost
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+func TestAlertProvider_IsValid(t *testing.T) {
+	invalidProvider := AlertProvider{WebhookURL: ""}
+	if invalidProvider.IsValid() {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{WebhookURL: "http://example.com"}
+	if !validProvider.IsValid() {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
+	provider := AlertProvider{WebhookURL: "http://example.com"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{ConditionResults: []*core.ConditionResult{{Condition: "SUCCESSFUL_CONDITION", Success: true}}}, true)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "resolved") {
+		t.Error("customAlertProvider.Body should've contained the substring resolved")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
+	provider := AlertProvider{WebhookURL: "http://example.com"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{ConditionResults: []*core.ConditionResult{{Condition: "UNSUCCESSFUL_CONDITION", Success: false}}}, false)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "triggered") {
+		t.Error("customAlertProvider.Body should've contained the substring triggered")
+	}
+}

alerting/provider/messagebird/messagebird.go

@@ -0,0 +1,50 @@
+package messagebird
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/core"
+)
+
+const (
+	restAPIURL = "https://rest.messagebird.com/messages"
+)
+
+// AlertProvider is the configuration necessary for sending an alert using Messagebird
+type AlertProvider struct {
+	AccessKey  string `yaml:"access-key"`
+	Originator string `yaml:"originator"`
+	Recipients string `yaml:"recipients"`
+}
+
+// IsValid returns whether the provider's configuration is valid
+func (provider *AlertProvider) IsValid() bool {
+	return len(provider.AccessKey) > 0 && len(provider.Originator) > 0 && len(provider.Recipients) > 0
+}
+
+// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+// Reference doc for messagebird https://developers.messagebird.com/api/sms-messaging/#send-outbound-sms
+func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, alert *core.Alert, _ *core.Result, resolved bool) *custom.AlertProvider {
+	var message string
+	if resolved {
+		message = fmt.Sprintf("RESOLVED: %s - %s", service.Name, alert.Description)
+	} else {
+		message = fmt.Sprintf("TRIGGERED: %s - %s", service.Name, alert.Description)
+	}
+
+	return &custom.AlertProvider{
+		URL:    restAPIURL,
+		Method: http.MethodPost,
+		Body: fmt.Sprintf(`{
+  "originator": "%s",
+  "recipients": "%s",
+  "body": "%s"
+}`, provider.Originator, provider.Recipients, message),
+		Headers: map[string]string{
+			"Content-Type":  "application/json",
+			"Authorization": fmt.Sprintf("AccessKey %s", provider.AccessKey),
+		},
+	}
+}

alerting/provider/messagebird/messagebird_test.go

@@ -0,0 +1,53 @@
+package messagebird
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+func TestMessagebirdAlertProvider_IsValid(t *testing.T) {
+	invalidProvider := AlertProvider{}
+	if invalidProvider.IsValid() {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{
+		AccessKey:  "1",
+		Originator: "1",
+		Recipients: "1",
+	}
+	if !validProvider.IsValid() {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
+	provider := AlertProvider{
+		AccessKey:  "1",
+		Originator: "1",
+		Recipients: "1",
+	}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, true)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "RESOLVED") {
+		t.Error("customAlertProvider.Body should've contained the substring RESOLVED")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
+	provider := AlertProvider{
+		AccessKey:  "1",
+		Originator: "1",
+		Recipients: "1",
+	}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, false)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "TRIGGERED") {
+		t.Error("customAlertProvider.Body should've contained the substring TRIGGERED")
+	}
+}

alerting/provider/pagerduty/pagerduty.go

@@ -0,0 +1,52 @@
+package pagerduty
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/core"
+)
+
+// AlertProvider is the configuration necessary for sending an alert using PagerDuty
+type AlertProvider struct {
+	IntegrationKey string `yaml:"integration-key"`
+}
+
+// IsValid returns whether the provider's configuration is valid
+func (provider *AlertProvider) IsValid() bool {
+	return len(provider.IntegrationKey) == 32
+}
+
+// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+//
+// relevant: https://developer.pagerduty.com/docs/events-api-v2/trigger-events/
+func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, alert *core.Alert, _ *core.Result, resolved bool) *custom.AlertProvider {
+	var message, eventAction, resolveKey string
+	if resolved {
+		message = fmt.Sprintf("RESOLVED: %s - %s", service.Name, alert.Description)
+		eventAction = "resolve"
+		resolveKey = alert.ResolveKey
+	} else {
+		message = fmt.Sprintf("TRIGGERED: %s - %s", service.Name, alert.Description)
+		eventAction = "trigger"
+		resolveKey = ""
+	}
+	return &custom.AlertProvider{
+		URL:    "https://events.pagerduty.com/v2/enqueue",
+		Method: http.MethodPost,
+		Body: fmt.Sprintf(`{
+  "routing_key": "%s",
+  "dedup_key": "%s",
+  "event_action": "%s",
+  "payload": {
+    "summary": "%s",
+    "source": "%s",
+    "severity": "critical"
+  }
+}`, provider.IntegrationKey, resolveKey, eventAction, message, service.Name),
+		Headers: map[string]string{
+			"Content-Type": "application/json",
+		},
+	}
+}

alerting/provider/pagerduty/pagerduty_test.go

@@ -0,0 +1,41 @@
+package pagerduty
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+func TestAlertProvider_IsValid(t *testing.T) {
+	invalidProvider := AlertProvider{IntegrationKey: ""}
+	if invalidProvider.IsValid() {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{IntegrationKey: "00000000000000000000000000000000"}
+	if !validProvider.IsValid() {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
+	provider := AlertProvider{IntegrationKey: "00000000000000000000000000000000"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, true)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "RESOLVED") {
+		t.Error("customAlertProvider.Body should've contained the substring RESOLVED")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
+	provider := AlertProvider{IntegrationKey: "00000000000000000000000000000000"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, false)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "TRIGGERED") {
+		t.Error("customAlertProvider.Body should've contained the substring TRIGGERED")
+	}
+}

alerting/provider/provider.go

@@ -0,0 +1,30 @@
+package provider
+
+import (
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/alerting/provider/mattermost"
+	"github.com/TwinProduction/gatus/alerting/provider/messagebird"
+	"github.com/TwinProduction/gatus/alerting/provider/pagerduty"
+	"github.com/TwinProduction/gatus/alerting/provider/slack"
+	"github.com/TwinProduction/gatus/alerting/provider/twilio"
+	"github.com/TwinProduction/gatus/core"
+)
+
+// AlertProvider is the interface that each providers should implement
+type AlertProvider interface {
+	// IsValid returns whether the provider's configuration is valid
+	IsValid() bool
+
+	// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+	ToCustomAlertProvider(service *core.Service, alert *core.Alert, result *core.Result, resolved bool) *custom.AlertProvider
+}
+
+var (
+	// Validate interface implementation on compile
+	_ AlertProvider = (*custom.AlertProvider)(nil)
+	_ AlertProvider = (*twilio.AlertProvider)(nil)
+	_ AlertProvider = (*slack.AlertProvider)(nil)
+	_ AlertProvider = (*mattermost.AlertProvider)(nil)
+	_ AlertProvider = (*messagebird.AlertProvider)(nil)
+	_ AlertProvider = (*pagerduty.AlertProvider)(nil)
+)

alerting/provider/slack/slack.go

@@ -0,0 +1,63 @@
+package slack
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/core"
+)
+
+// AlertProvider is the configuration necessary for sending an alert using Slack
+type AlertProvider struct {
+	WebhookURL string `yaml:"webhook-url"`
+}
+
+// IsValid returns whether the provider's configuration is valid
+func (provider *AlertProvider) IsValid() bool {
+	return len(provider.WebhookURL) > 0
+}
+
+// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, alert *core.Alert, result *core.Result, resolved bool) *custom.AlertProvider {
+	var message, color, results string
+	if resolved {
+		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", service.Name, alert.SuccessThreshold)
+		color = "#36A64F"
+	} else {
+		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", service.Name, alert.FailureThreshold)
+		color = "#DD0000"
+	}
+	for _, conditionResult := range result.ConditionResults {
+		var prefix string
+		if conditionResult.Success {
+			prefix = ":heavy_check_mark:"
+		} else {
+			prefix = ":x:"
+		}
+		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+	}
+	return &custom.AlertProvider{
+		URL:    provider.WebhookURL,
+		Method: http.MethodPost,
+		Body: fmt.Sprintf(`{
+  "text": "",
+  "attachments": [
+    {
+      "title": ":helmet_with_white_cross: Gatus",
+      "text": "%s:\n> %s",
+      "short": false,
+      "color": "%s",
+      "fields": [
+        {
+          "title": "Condition results",
+          "value": "%s",
+          "short": false
+        }
+      ]
+    }
+  ]
+}`, message, alert.Description, color, results),
+		Headers: map[string]string{"Content-Type": "application/json"},
+	}
+}

alerting/provider/slack/slack_test.go

@@ -0,0 +1,41 @@
+package slack
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+func TestAlertProvider_IsValid(t *testing.T) {
+	invalidProvider := AlertProvider{WebhookURL: ""}
+	if invalidProvider.IsValid() {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{WebhookURL: "http://example.com"}
+	if !validProvider.IsValid() {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
+	provider := AlertProvider{WebhookURL: "http://example.com"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{ConditionResults: []*core.ConditionResult{{Condition: "SUCCESSFUL_CONDITION", Success: true}}}, true)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "resolved") {
+		t.Error("customAlertProvider.Body should've contained the substring resolved")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
+	provider := AlertProvider{WebhookURL: "http://example.com"}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{ConditionResults: []*core.ConditionResult{{Condition: "UNSUCCESSFUL_CONDITION", Success: false}}}, false)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "triggered") {
+		t.Error("customAlertProvider.Body should've contained the substring triggered")
+	}
+}

alerting/provider/twilio/twilio.go

@@ -0,0 +1,47 @@
+package twilio
+
+import (
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/core"
+)
+
+// AlertProvider is the configuration necessary for sending an alert using Twilio
+type AlertProvider struct {
+	SID   string `yaml:"sid"`
+	Token string `yaml:"token"`
+	From  string `yaml:"from"`
+	To    string `yaml:"to"`
+}
+
+// IsValid returns whether the provider's configuration is valid
+func (provider *AlertProvider) IsValid() bool {
+	return len(provider.Token) > 0 && len(provider.SID) > 0 && len(provider.From) > 0 && len(provider.To) > 0
+}
+
+// ToCustomAlertProvider converts the provider into a custom.AlertProvider
+func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, alert *core.Alert, _ *core.Result, resolved bool) *custom.AlertProvider {
+	var message string
+	if resolved {
+		message = fmt.Sprintf("RESOLVED: %s - %s", service.Name, alert.Description)
+	} else {
+		message = fmt.Sprintf("TRIGGERED: %s - %s", service.Name, alert.Description)
+	}
+	return &custom.AlertProvider{
+		URL:    fmt.Sprintf("https://api.twilio.com/2010-04-01/Accounts/%s/Messages.json", provider.SID),
+		Method: http.MethodPost,
+		Body: url.Values{
+			"To":   {provider.To},
+			"From": {provider.From},
+			"Body": {message},
+		}.Encode(),
+		Headers: map[string]string{
+			"Content-Type":  "application/x-www-form-urlencoded",
+			"Authorization": fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", provider.SID, provider.Token)))),
+		},
+	}
+}

alerting/provider/twilio/twilio_test.go

@@ -0,0 +1,56 @@
+package twilio
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+func TestTwilioAlertProvider_IsValid(t *testing.T) {
+	invalidProvider := AlertProvider{}
+	if invalidProvider.IsValid() {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{
+		SID:   "1",
+		Token: "1",
+		From:  "1",
+		To:    "1",
+	}
+	if !validProvider.IsValid() {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
+	provider := AlertProvider{
+		SID:   "1",
+		Token: "1",
+		From:  "1",
+		To:    "1",
+	}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, true)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "RESOLVED") {
+		t.Error("customAlertProvider.Body should've contained the substring RESOLVED")
+	}
+}
+
+func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
+	provider := AlertProvider{
+		SID:   "1",
+		Token: "1",
+		From:  "1",
+		To:    "1",
+	}
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, false)
+	if customAlertProvider == nil {
+		t.Error("customAlertProvider shouldn't have been nil")
+	}
+	if !strings.Contains(customAlertProvider.Body, "TRIGGERED") {
+		t.Error("customAlertProvider.Body should've contained the substring TRIGGERED")
+	}
+}

client/client.go

@@ -1,19 +1,84 @@
 package client
 
 import (
+	"crypto/tls"
+	"net"
 	"net/http"
 	"time"
+
+	"github.com/go-ping/ping"
 )
 
 var (
-	client *http.Client
+	secureHTTPClient   *http.Client
+	insecureHTTPClient *http.Client
+
+	// pingTimeout is the timeout for the Ping function
+	// This is mainly exposed for testing purposes
+	pingTimeout = 5 * time.Second
 )
 
-func GetHttpClient() *http.Client {
-	if client == nil {
-		client = &http.Client{
-			Timeout: time.Second * 10,
+// GetHTTPClient returns the shared HTTP client
+func GetHTTPClient(insecure bool) *http.Client {
+	if insecure {
+		if insecureHTTPClient == nil {
+			insecureHTTPClient = &http.Client{
+				Timeout: 10 * time.Second,
+				Transport: &http.Transport{
+					MaxIdleConns:        100,
+					MaxIdleConnsPerHost: 20,
+					TLSClientConfig: &tls.Config{
+						InsecureSkipVerify: true,
+					},
+				},
+			}
+		}
+		return insecureHTTPClient
+	}
+	if secureHTTPClient == nil {
+		secureHTTPClient = &http.Client{
+			Timeout: 10 * time.Second,
+			Transport: &http.Transport{
+				MaxIdleConns:        100,
+				MaxIdleConnsPerHost: 20,
+			},
 		}
 	}
-	return client
+	return secureHTTPClient
+}
+
+// CanCreateTCPConnection checks whether a connection can be established with a TCP service
+func CanCreateTCPConnection(address string) bool {
+	conn, err := net.DialTimeout("tcp", address, 5*time.Second)
+	if err != nil {
+		return false
+	}
+	_ = conn.Close()
+	return true
+}
+
+// Ping checks if an address can be pinged and returns the round-trip time if the address can be pinged
+//
+// Note that this function takes at least 100ms, even if the address is 127.0.0.1
+func Ping(address string) (bool, time.Duration) {
+	pinger, err := ping.NewPinger(address)
+	if err != nil {
+		return false, 0
+	}
+	pinger.Count = 1
+	pinger.Timeout = pingTimeout
+	pinger.SetNetwork("ip4")
+	pinger.SetPrivileged(true)
+	err = pinger.Run()
+	if err != nil {
+		return false, 0
+	}
+	if pinger.Statistics() != nil {
+		// If the packet loss is 100, it means that the packet didn't reach the host
+		if pinger.Statistics().PacketLoss == 100 {
+			return false, pinger.Timeout
+		}
+		return true, pinger.Statistics().MaxRtt
+	}
+	return true, 0
 }

client/client_test.go

@@ -0,0 +1,51 @@
+package client
+
+import (
+	"testing"
+	"time"
+)
+
+func TestGetHTTPClient(t *testing.T) {
+	if secureHTTPClient != nil {
+		t.Error("secureHTTPClient should've been nil since it hasn't been called a single time yet")
+	}
+	if insecureHTTPClient != nil {
+		t.Error("insecureHTTPClient should've been nil since it hasn't been called a single time yet")
+	}
+	_ = GetHTTPClient(false)
+	if secureHTTPClient == nil {
+		t.Error("secureHTTPClient shouldn't have been nil, since it has been called once")
+	}
+	if insecureHTTPClient != nil {
+		t.Error("insecureHTTPClient should've been nil since it hasn't been called a single time yet")
+	}
+	_ = GetHTTPClient(true)
+	if secureHTTPClient == nil {
+		t.Error("secureHTTPClient shouldn't have been nil, since it has been called once")
+	}
+	if insecureHTTPClient == nil {
+		t.Error("insecureHTTPClient shouldn't have been nil, since it has been called once")
+	}
+}
+
+func TestPing(t *testing.T) {
+	pingTimeout = 500 * time.Millisecond
+	if success, rtt := Ping("127.0.0.1"); !success {
+		t.Error("expected true")
+		if rtt == 0 {
+			t.Error("Round-trip time returned on success should've higher than 0")
+		}
+	}
+	if success, rtt := Ping("256.256.256.256"); success {
+		t.Error("expected false, because the IP is invalid")
+		if rtt != 0 {
+			t.Error("Round-trip time returned on failure should've been 0")
+		}
+	}
+	if success, rtt := Ping("192.168.152.153"); success {
+		t.Error("expected false, because the IP is valid but the host should be unreachable")
+		if rtt != 0 {
+			t.Error("Round-trip time returned on failure should've been 0")
+		}
+	}
+}

config.yaml

@@ -1,17 +1,38 @@
-metrics: true
 services:
-  - name: twinnation
-    interval: 30s
-    url: https://twinnation.org/health
+  - name: frontend
+    group: core
+    url: "https://twinnation.org/health"
+    interval: 1m
     conditions:
       - "[STATUS] == 200"
       - "[BODY].status == UP"
-      - "[RESPONSE_TIME] < 1000"
-  - name: twinnation-articles-api
-    interval: 30s
-    url: "https://twinnation.org/api/v1/articles/24"
+      - "[RESPONSE_TIME] < 70"
+
+  - name: backend
+    group: core
+    url: "http://example.org/"
+    interval: 5m
     conditions:
       - "[STATUS] == 200"
-      - "[BODY].id == 24"
-      - "[BODY].tags[0] == spring"
-      - "len([BODY].tags) > 0"
+
+  - name: monitoring
+    group: internal
+    url: "http://example.com/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - name: nas
+    group: internal
+    url: "https://example.org/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - name: cat-fact
+    url: "https://cat-fact.herokuapp.com/facts/random"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].deleted == false"
+      - "len([BODY].text) > 0"

config/config.go

@@ -2,31 +2,83 @@ package config
 
 import (
 	"errors"
-	"github.com/TwinProduction/gatus/core"
-	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"log"
 	"os"
+
+	"github.com/TwinProduction/gatus/alerting"
+	"github.com/TwinProduction/gatus/alerting/provider"
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/k8s"
+	"github.com/TwinProduction/gatus/security"
+	"gopkg.in/yaml.v2"
 )
 
 const (
+	// DefaultConfigurationFilePath is the default path that will be used to search for the configuration file
+	// if a custom path isn't configured through the GATUS_CONFIG_FILE environment variable
 	DefaultConfigurationFilePath = "config/config.yaml"
+
+	// DefaultFallbackConfigurationFilePath is the default fallback path that will be used to search for the
+	// configuration file if DefaultConfigurationFilePath didn't work
+	DefaultFallbackConfigurationFilePath = "config/config.yml"
+
+	// DefaultAddress is the default address the service will bind to
+	DefaultAddress = "0.0.0.0"
+
+	// DefaultPort is the default port the service will listen on
+	DefaultPort = 8080
+
+	// DefaultContextRoot is the default context root of the web application
+	DefaultContextRoot = "/"
 )
 
 var (
-	ErrNoServiceInConfig  = errors.New("configuration file should contain at least 1 service")
+	// ErrNoServiceInConfig is an error returned when a configuration file has no services configured
+	ErrNoServiceInConfig = errors.New("configuration file should contain at least 1 service")
+
+	// ErrConfigFileNotFound is an error returned when the configuration file could not be found
 	ErrConfigFileNotFound = errors.New("configuration file not found")
-	ErrConfigNotLoaded    = errors.New("configuration is nil")
-	config                *Config
+
+	// ErrConfigNotLoaded is an error returned when an attempt to Get() the configuration before loading it is made
+	ErrConfigNotLoaded = errors.New("configuration is nil")
+
+	// ErrInvalidSecurityConfig is an error returned when the security configuration is invalid
+	ErrInvalidSecurityConfig = errors.New("invalid security configuration")
+
+	config *Config
 )
 
+// Config is the main configuration structure
 type Config struct {
-	Metrics  bool                 `yaml:"metrics"`
-	Debug    bool                 `yaml:"debug"`
-	Alerting *core.AlertingConfig `yaml:"alerting"`
-	Services []*core.Service      `yaml:"services"`
+	// Debug Whether to enable debug logs
+	Debug bool `yaml:"debug"`
+
+	// Metrics Whether to expose metrics at /metrics
+	Metrics bool `yaml:"metrics"`
+
+	// DisableMonitoringLock Whether to disable the monitoring lock
+	// The monitoring lock is what prevents multiple services from being processed at the same time.
+	// Disabling this may lead to inaccurate response times
+	DisableMonitoringLock bool `yaml:"disable-monitoring-lock"`
+
+	// Security Configuration for securing access to Gatus
+	Security *security.Config `yaml:"security"`
+
+	// Alerting Configuration for alerting
+	Alerting *alerting.Config `yaml:"alerting"`
+
+	// Services List of services to monitor
+	Services []*core.Service `yaml:"services"`
+
+	// Kubernetes is the Kubernetes configuration
+	Kubernetes *k8s.Config `yaml:"kubernetes"`
+
+	// Web is the configuration for the web listener
+	Web *webConfig `yaml:"web"`
 }
 
+// Get returns the configuration, or panics if the configuration hasn't loaded yet
 func Get() *Config {
 	if config == nil {
 		panic(ErrConfigNotLoaded)
@@ -34,25 +86,33 @@ func Get() *Config {
 	return config
 }
 
+// Set sets the configuration
+// Used only for testing
+func Set(cfg *Config) {
+	config = cfg
+}
+
+// Load loads a custom configuration file
+// Note that the misconfiguration of some fields may lead to panics. This is on purpose.
 func Load(configFile string) error {
-	log.Printf("[config][Load] Attempting to load config from configFile=%s", configFile)
+	log.Printf("[config][Load] Reading configuration from configFile=%s", configFile)
 	cfg, err := readConfigurationFile(configFile)
 	if err != nil {
 		if os.IsNotExist(err) {
 			return ErrConfigFileNotFound
-		} else {
-			return err
 		}
+		return err
 	}
 	config = cfg
 	return nil
 }
 
+// LoadDefaultConfiguration loads the default configuration file
 func LoadDefaultConfiguration() error {
 	err := Load(DefaultConfigurationFilePath)
 	if err != nil {
 		if err == ErrConfigFileNotFound {
-			return Load("config/config.yml")
+			return Load(DefaultFallbackConfigurationFilePath)
 		}
 		return err
 	}
@@ -73,14 +133,142 @@ func parseAndValidateConfigBytes(yamlBytes []byte) (config *Config, err error) {
 	yamlBytes = []byte(os.ExpandEnv(string(yamlBytes)))
 	// Parse configuration file
 	err = yaml.Unmarshal(yamlBytes, &config)
-	// Check if the configuration file at least has services.
-	if config == nil || len(config.Services) == 0 {
+	if err != nil {
+		return
+	}
+	// Check if the configuration file at least has services configured or Kubernetes auto discovery enabled
+	if config == nil || ((config.Services == nil || len(config.Services) == 0) && (config.Kubernetes == nil || !config.Kubernetes.AutoDiscover)) {
 		err = ErrNoServiceInConfig
 	} else {
-		// Set the default values if they aren't set
-		for _, service := range config.Services {
-			service.Validate()
-		}
+		// Note that the functions below may panic, and this is on purpose to prevent Gatus from starting with
+		// invalid configurations
+		validateAlertingConfig(config)
+		validateSecurityConfig(config)
+		validateServicesConfig(config)
+		validateKubernetesConfig(config)
+		validateWebConfig(config)
 	}
 	return
 }
+
+func validateWebConfig(config *Config) {
+	if config.Web == nil {
+		config.Web = &webConfig{Address: DefaultAddress, Port: DefaultPort, ContextRoot: DefaultContextRoot}
+	} else {
+		config.Web.validateAndSetDefaults()
+	}
+}
+
+func validateKubernetesConfig(config *Config) {
+	if config.Kubernetes != nil && config.Kubernetes.AutoDiscover {
+		if config.Kubernetes.ServiceTemplate == nil {
+			panic("kubernetes.service-template cannot be nil")
+		}
+		if config.Debug {
+			log.Println("[config][validateKubernetesConfig] Automatically discovering Kubernetes services...")
+		}
+		discoveredServices, err := k8s.DiscoverServices(config.Kubernetes)
+		if err != nil {
+			panic(err)
+		}
+		config.Services = append(config.Services, discoveredServices...)
+		log.Printf("[config][validateKubernetesConfig] Discovered %d Kubernetes services", len(discoveredServices))
+	}
+}
+
+func validateServicesConfig(config *Config) {
+	for _, service := range config.Services {
+		if config.Debug {
+			log.Printf("[config][validateServicesConfig] Validating service '%s'", service.Name)
+		}
+		service.ValidateAndSetDefaults()
+	}
+	log.Printf("[config][validateServicesConfig] Validated %d services", len(config.Services))
+}
+
+func validateSecurityConfig(config *Config) {
+	if config.Security != nil {
+		if config.Security.IsValid() {
+			if config.Debug {
+				log.Printf("[config][validateSecurityConfig] Basic security configuration has been validated")
+			}
+		} else {
+			// If there was an attempt to configure security, then it must mean that some confidential or private
+			// data are exposed. As a result, we'll force a panic because it's better to be safe than sorry.
+			panic(ErrInvalidSecurityConfig)
+		}
+	}
+}
+
+func validateAlertingConfig(config *Config) {
+	if config.Alerting == nil {
+		log.Printf("[config][validateAlertingConfig] Alerting is not configured")
+		return
+	}
+	alertTypes := []core.AlertType{
+		core.SlackAlert,
+		core.MattermostAlert,
+		core.MessagebirdAlert,
+		core.TwilioAlert,
+		core.PagerDutyAlert,
+		core.CustomAlert,
+	}
+	var validProviders, invalidProviders []core.AlertType
+	for _, alertType := range alertTypes {
+		alertProvider := GetAlertingProviderByAlertType(config, alertType)
+		if alertProvider != nil {
+			if alertProvider.IsValid() {
+				validProviders = append(validProviders, alertType)
+			} else {
+				log.Printf("[config][validateAlertingConfig] Ignoring provider=%s because configuration is invalid", alertType)
+				invalidProviders = append(invalidProviders, alertType)
+			}
+		} else {
+			invalidProviders = append(invalidProviders, alertType)
+		}
+	}
+	log.Printf("[config][validateAlertingConfig] configuredProviders=%s; ignoredProviders=%s", validProviders, invalidProviders)
+}
+
+// GetAlertingProviderByAlertType returns an provider.AlertProvider by its corresponding core.AlertType
+func GetAlertingProviderByAlertType(config *Config, alertType core.AlertType) provider.AlertProvider {
+	switch alertType {
+	case core.SlackAlert:
+		if config.Alerting.Slack == nil {
+			// Since we're returning an interface, we need to explicitly return nil, even if the provider itself is nil
+			return nil
+		}
+		return config.Alerting.Slack
+	case core.MattermostAlert:
+		if config.Alerting.Mattermost == nil {
+			// Since we're returning an interface, we need to explicitly return nil, even if the provider itself is nil
+			return nil
+		}
+		return config.Alerting.Mattermost
+	case core.MessagebirdAlert:
+		if config.Alerting.Messagebird == nil {
+			// Since we're returning an interface, we need to explicitly return nil, even if the provider itself is nil
+			return nil
+		}
+		return config.Alerting.Messagebird
+	case core.TwilioAlert:
+		if config.Alerting.Twilio == nil {
+			// Since we're returning an interface, we need to explicitly return nil, even if the provider itself is nil
+			return nil
+		}
+		return config.Alerting.Twilio
+	case core.PagerDutyAlert:
+		if config.Alerting.PagerDuty == nil {
+			// Since we're returning an interface, we need to explicitly return nil, even if the provider itself is nil
+			return nil
+		}
+		return config.Alerting.PagerDuty
+	case core.CustomAlert:
+		if config.Alerting.Custom == nil {
+			// Since we're returning an interface, we need to explicitly return nil, even if the provider itself is nil
+			return nil
+		}
+		return config.Alerting.Custom
+	}
+	return nil
+}

config/config_test.go

@@ -2,16 +2,50 @@ package config
 
 import (
 	"fmt"
-	"github.com/TwinProduction/gatus/core"
+	"strings"
 	"testing"
 	"time"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/k8stest"
+	v1 "k8s.io/api/core/v1"
 )
 
+func TestGetBeforeConfigIsLoaded(t *testing.T) {
+	defer func() { recover() }()
+	Get()
+	t.Fatal("Should've panicked because the configuration hasn't been loaded yet")
+}
+
+func TestSet(t *testing.T) {
+	if config != nil {
+		t.Fatal("config should've been nil")
+	}
+	Set(&Config{})
+	if config == nil {
+		t.Fatal("config shouldn't have been nil")
+	}
+}
+
+func TestLoadFileThatDoesNotExist(t *testing.T) {
+	err := Load("file-that-does-not-exist.yaml")
+	if err == nil {
+		t.Error("Should've returned an error, because the file specified doesn't exist")
+	}
+}
+
+func TestLoadDefaultConfigurationFile(t *testing.T) {
+	err := LoadDefaultConfiguration()
+	if err == nil {
+		t.Error("Should've returned an error, because there's no configuration files at the default path nor the default fallback path")
+	}
+}
+
 func TestParseAndValidateConfigBytes(t *testing.T) {
 	config, err := parseAndValidateConfigBytes([]byte(`
 services:
   - name: twinnation
-    url: https://twinnation.org/actuator/health
+    url: https://twinnation.org/health
     interval: 15s
     conditions:
       - "[STATUS] == 200"
@@ -30,13 +64,18 @@ services:
 	if len(config.Services) != 2 {
 		t.Error("Should have returned two services")
 	}
-	if config.Services[0].Url != "https://twinnation.org/actuator/health" {
-		t.Errorf("URL should have been %s", "https://twinnation.org/actuator/health")
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
 	}
-	if config.Services[1].Url != "https://api.github.com/healthz" {
+	if config.Services[1].URL != "https://api.github.com/healthz" {
 		t.Errorf("URL should have been %s", "https://api.github.com/healthz")
 	}
-	fmt.Println(config.Services[0].Interval)
+	if config.Services[0].Method != "GET" {
+		t.Errorf("Method should have been %s (default)", "GET")
+	}
+	if config.Services[1].Method != "GET" {
+		t.Errorf("Method should have been %s (default)", "GET")
+	}
 	if config.Services[0].Interval != 15*time.Second {
 		t.Errorf("Interval should have been %s", 15*time.Second)
 	}
@@ -53,6 +92,42 @@ services:
 
 func TestParseAndValidateConfigBytesDefault(t *testing.T) {
 	config, err := parseAndValidateConfigBytes([]byte(`
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Metrics {
+		t.Error("Metrics should've been false by default")
+	}
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
+	}
+	if config.Services[0].Interval != 60*time.Second {
+		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+	}
+	if config.Web.Address != DefaultAddress {
+		t.Errorf("Bind address should have been %s, because it is the default value", DefaultAddress)
+	}
+	if config.Web.Port != DefaultPort {
+		t.Errorf("Port should have been %d, because it is the default value", DefaultPort)
+	}
+	if config.Web.ContextRoot != DefaultContextRoot {
+		t.Errorf("ContextRoot should have been %s, because it is the default value", DefaultContextRoot)
+	}
+}
+
+func TestParseAndValidateConfigBytesWithAddress(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+web:
+  address: 127.0.0.1
 services:
   - name: twinnation
     url: https://twinnation.org/actuator/health
@@ -68,17 +143,26 @@ services:
 	if config.Metrics {
 		t.Error("Metrics should've been false by default")
 	}
-	if config.Services[0].Url != "https://twinnation.org/actuator/health" {
+	if config.Services[0].URL != "https://twinnation.org/actuator/health" {
 		t.Errorf("URL should have been %s", "https://twinnation.org/actuator/health")
 	}
 	if config.Services[0].Interval != 60*time.Second {
 		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
 	}
+
+	if config.Web.Address != "127.0.0.1" {
+		t.Errorf("Bind address should have been %s, because it is specified in config", "127.0.0.1")
+	}
+
+	if config.Web.Port != DefaultPort {
+		t.Errorf("Port should have been %d, because it is the default value", DefaultPort)
+	}
 }
 
-func TestParseAndValidateConfigBytesWithMetrics(t *testing.T) {
+func TestParseAndValidateConfigBytesWithPort(t *testing.T) {
 	config, err := parseAndValidateConfigBytes([]byte(`
-metrics: true
+web:
+  port: 12345
 services:
   - name: twinnation
     url: https://twinnation.org/actuator/health
@@ -91,15 +175,188 @@ services:
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
 	}
-	if !config.Metrics {
-		t.Error("Metrics should have been true")
+	if config.Metrics {
+		t.Error("Metrics should've been false by default")
 	}
-	if config.Services[0].Url != "https://twinnation.org/actuator/health" {
+	if config.Services[0].URL != "https://twinnation.org/actuator/health" {
 		t.Errorf("URL should have been %s", "https://twinnation.org/actuator/health")
 	}
 	if config.Services[0].Interval != 60*time.Second {
 		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
 	}
+
+	if config.Web.Address != DefaultAddress {
+		t.Errorf("Bind address should have been %s, because it is the default value", DefaultAddress)
+	}
+
+	if config.Web.Port != 12345 {
+		t.Errorf("Port should have been %d, because it is specified in config", 12345)
+	}
+}
+
+func TestParseAndValidateConfigBytesWithPortAndHost(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+web:
+  port: 12345
+  address: 127.0.0.1
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Metrics {
+		t.Error("Metrics should've been false by default")
+	}
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
+	}
+	if config.Services[0].Interval != 60*time.Second {
+		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+	}
+	if config.Web.Address != "127.0.0.1" {
+		t.Errorf("Bind address should have been %s, because it is specified in config", "127.0.0.1")
+	}
+	if config.Web.Port != 12345 {
+		t.Errorf("Port should have been %d, because it is specified in config", 12345)
+	}
+}
+
+func TestParseAndValidateConfigBytesWithPortAndHostAndContextRoot(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+web:
+  port: 12345
+  address: 127.0.0.1
+  context-root: /deeply/nested/down=/their
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Metrics {
+		t.Error("Metrics should've been false by default")
+	}
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
+	}
+	if config.Services[0].Interval != 60*time.Second {
+		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+	}
+	if config.Web.Address != "127.0.0.1" {
+		t.Errorf("Bind address should have been %s, because it is specified in config", "127.0.0.1")
+	}
+	if config.Web.Port != 12345 {
+		t.Errorf("Port should have been %d, because it is specified in config", 12345)
+	}
+	if config.Web.ContextRoot != "/deeply/nested/down=/their/" {
+		t.Errorf("Port should have been %s, because it is specified in config", "/deeply/nested/down=/their/")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithInvalidPort(t *testing.T) {
+	defer func() { recover() }()
+	_, _ = parseAndValidateConfigBytes([]byte(`
+web:
+  port: 65536
+  address: 127.0.0.1
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`))
+	t.Fatal("Should've panicked because the configuration specifies an invalid port value")
+}
+
+func TestParseAndValidateConfigBytesWithMetricsAndCustomUserAgentHeader(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+metrics: true
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    headers:
+      User-Agent: Test/2.0
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if !config.Metrics {
+		t.Error("Metrics should have been true")
+	}
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
+	}
+	if config.Services[0].Interval != 60*time.Second {
+		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+	}
+	if config.Web.Address != DefaultAddress {
+		t.Errorf("Bind address should have been %s, because it is the default value", DefaultAddress)
+	}
+	if config.Web.Port != DefaultPort {
+		t.Errorf("Port should have been %d, because it is the default value", DefaultPort)
+	}
+	if config.Web.ContextRoot != DefaultContextRoot {
+		t.Errorf("ContextRoot should have been %s, because it is the default value", DefaultContextRoot)
+	}
+	if userAgent := config.Services[0].Headers["User-Agent"]; userAgent != "Test/2.0" {
+		t.Errorf("User-Agent should've been %s, got %s", "Test/2.0", userAgent)
+	}
+}
+
+func TestParseAndValidateConfigBytesWithMetricsAndHostAndPort(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+metrics: true
+web:
+  address: 192.168.0.1
+  port: 9090
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if !config.Metrics {
+		t.Error("Metrics should have been true")
+	}
+	if config.Web.Address != "192.168.0.1" {
+		t.Errorf("Bind address should have been %s, because it is the default value", "192.168.0.1")
+	}
+	if config.Web.Port != 9090 {
+		t.Errorf("Port should have been %d, because it is specified in config", 9090)
+	}
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
+	}
+	if config.Services[0].Interval != 60*time.Second {
+		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+	}
+	if userAgent := config.Services[0].Headers["User-Agent"]; userAgent != core.GatusUserAgent {
+		t.Errorf("User-Agent should've been %s because it's the default value, got %s", core.GatusUserAgent, userAgent)
+	}
 }
 
 func TestParseAndValidateBadConfigBytes(t *testing.T) {
@@ -120,16 +377,30 @@ badconfig:
 
 func TestParseAndValidateConfigBytesWithAlerting(t *testing.T) {
 	config, err := parseAndValidateConfigBytes([]byte(`
+debug: true
+
 alerting:
-  slack: "http://example.com"
+  slack:
+    webhook-url: "http://example.com"
+  pagerduty:
+    integration-key: "00000000000000000000000000000000"
+  messagebird:
+    access-key: "1"
+    originator: "31619191918"
+    recipients: "31619191919"
 services:
   - name: twinnation
-    url: https://twinnation.org/actuator/health
+    url: https://twinnation.org/health
     alerts:
       - type: slack
         enabled: true
-        threshold: 7
+      - type: pagerduty
+        enabled: true
+        failure-threshold: 7
+        success-threshold: 5
         description: "Healthcheck failed 7 times in a row"
+      - type: messagebird
+        enabled: true
     conditions:
       - "[STATUS] == 200"
 `))
@@ -143,16 +414,37 @@ services:
 		t.Error("Metrics should've been false by default")
 	}
 	if config.Alerting == nil {
-		t.Fatal("config.AlertingConfig shouldn't have been nil")
+		t.Fatal("config.Alerting shouldn't have been nil")
 	}
-	if config.Alerting.Slack != "http://example.com" {
-		t.Errorf("Slack webhook should've been %s, but was %s", "http://example.com", config.Alerting.Slack)
+	if config.Alerting.Slack == nil || !config.Alerting.Slack.IsValid() {
+		t.Fatal("Slack alerting config should've been valid")
+	}
+	if config.Alerting.Slack.WebhookURL != "http://example.com" {
+		t.Errorf("Slack webhook should've been %s, but was %s", "http://example.com", config.Alerting.Slack.WebhookURL)
+	}
+	if config.Alerting.PagerDuty == nil || !config.Alerting.PagerDuty.IsValid() {
+		t.Fatal("PagerDuty alerting config should've been valid")
+	}
+	if config.Alerting.Messagebird == nil || !config.Alerting.Messagebird.IsValid() {
+		t.Fatal("Messagebird alerting config should've been valid")
+	}
+	if config.Alerting.PagerDuty.IntegrationKey != "00000000000000000000000000000000" {
+		t.Errorf("PagerDuty integration key should've been %s, but was %s", "00000000000000000000000000000000", config.Alerting.PagerDuty.IntegrationKey)
+	}
+	if config.Alerting.Messagebird.AccessKey != "1" {
+		t.Errorf("Messagebird access key should've been %s, but was %s", "1", config.Alerting.Messagebird.AccessKey)
+	}
+	if config.Alerting.Messagebird.Originator != "31619191918" {
+		t.Errorf("Messagebird originator field should've been %s, but was %s", "31619191918", config.Alerting.Messagebird.Originator)
+	}
+	if config.Alerting.Messagebird.Recipients != "31619191919" {
+		t.Errorf("Messagebird to recipients should've been %s, but was %s", "31619191919", config.Alerting.Messagebird.Recipients)
 	}
 	if len(config.Services) != 1 {
 		t.Error("There should've been 1 service")
 	}
-	if config.Services[0].Url != "https://twinnation.org/actuator/health" {
-		t.Errorf("URL should have been %s", "https://twinnation.org/actuator/health")
+	if config.Services[0].URL != "https://twinnation.org/health" {
+		t.Errorf("URL should have been %s", "https://twinnation.org/health")
 	}
 	if config.Services[0].Interval != 60*time.Second {
 		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
@@ -160,19 +452,309 @@ services:
 	if config.Services[0].Alerts == nil {
 		t.Fatal("The service alerts shouldn't have been nil")
 	}
-	if len(config.Services[0].Alerts) != 1 {
-		t.Fatal("There should've been 1 alert configured")
+	if len(config.Services[0].Alerts) != 3 {
+		t.Fatal("There should've been 3 alert configured")
 	}
 	if !config.Services[0].Alerts[0].Enabled {
 		t.Error("The alert should've been enabled")
 	}
-	if config.Services[0].Alerts[0].Threshold != 7 {
-		t.Errorf("The threshold of the alert should've been %d, but it was %d", 7, config.Services[0].Alerts[0].Threshold)
+	if config.Services[0].Alerts[0].FailureThreshold != 3 {
+		t.Errorf("The default failure threshold of the alert should've been %d, but it was %d", 3, config.Services[0].Alerts[0].FailureThreshold)
+	}
+	if config.Services[0].Alerts[0].SuccessThreshold != 2 {
+		t.Errorf("The default success threshold of the alert should've been %d, but it was %d", 2, config.Services[0].Alerts[0].SuccessThreshold)
+	}
+	if config.Services[0].Alerts[1].FailureThreshold != 7 {
+		t.Errorf("The failure threshold of the alert should've been %d, but it was %d", 7, config.Services[0].Alerts[1].FailureThreshold)
+	}
+	if config.Services[0].Alerts[1].SuccessThreshold != 5 {
+		t.Errorf("The success threshold of the alert should've been %d, but it was %d", 5, config.Services[0].Alerts[1].SuccessThreshold)
 	}
 	if config.Services[0].Alerts[0].Type != core.SlackAlert {
 		t.Errorf("The type of the alert should've been %s, but it was %s", core.SlackAlert, config.Services[0].Alerts[0].Type)
 	}
-	if config.Services[0].Alerts[0].Description != "Healthcheck failed 7 times in a row" {
-		t.Errorf("The type of the alert should've been %s, but it was %s", "Healthcheck failed 7 times in a row", config.Services[0].Alerts[0].Description)
+	if config.Services[0].Alerts[1].Type != core.PagerDutyAlert {
+		t.Errorf("The type of the alert should've been %s, but it was %s", core.PagerDutyAlert, config.Services[0].Alerts[1].Type)
+	}
+	if config.Services[0].Alerts[1].Description != "Healthcheck failed 7 times in a row" {
+		t.Errorf("The description of the alert should've been %s, but it was %s", "Healthcheck failed 7 times in a row", config.Services[0].Alerts[0].Description)
+	}
+	if config.Services[0].Alerts[2].Type != core.MessagebirdAlert {
+		t.Errorf("The type of the alert should've been %s, but it was %s", core.MessagebirdAlert, config.Services[0].Alerts[1].Type)
 	}
 }
+
+func TestParseAndValidateConfigBytesWithInvalidPagerDutyAlertingConfig(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+alerting:
+  pagerduty:
+    integration-key: "INVALID_KEY"
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    alerts:
+      - type: pagerduty
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Alerting == nil {
+		t.Fatal("config.Alerting shouldn't have been nil")
+	}
+	if config.Alerting.PagerDuty == nil {
+		t.Fatal("PagerDuty alerting config shouldn't have been nil")
+	}
+	if config.Alerting.PagerDuty.IsValid() {
+		t.Fatal("PagerDuty alerting config should've been invalid")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithCustomAlertingConfig(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+alerting:
+  custom:
+    url: "https://example.com"
+    body: |
+      {
+        "text": "[ALERT_TRIGGERED_OR_RESOLVED]: [SERVICE_NAME] - [ALERT_DESCRIPTION]"
+      }
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    alerts:
+      - type: custom
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Alerting == nil {
+		t.Fatal("config.Alerting shouldn't have been nil")
+	}
+	if config.Alerting.Custom == nil {
+		t.Fatal("PagerDuty alerting config shouldn't have been nil")
+	}
+	if !config.Alerting.Custom.IsValid() {
+		t.Fatal("Custom alerting config should've been valid")
+	}
+	if config.Alerting.Custom.Insecure {
+		t.Fatal("config.Alerting.Custom.Insecure shouldn't have been true")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithCustomAlertingConfigThatHasInsecureSetToTrue(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+alerting:
+  custom:
+    url: "https://example.com"
+    method: "POST"
+    insecure: true
+    body: |
+      {
+        "text": "[ALERT_TRIGGERED_OR_RESOLVED]: [SERVICE_NAME] - [ALERT_DESCRIPTION]"
+      }
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    alerts:
+      - type: custom
+    conditions:
+      - "[STATUS] == 200"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Alerting == nil {
+		t.Fatal("config.Alerting shouldn't have been nil")
+	}
+	if config.Alerting.Custom == nil {
+		t.Fatal("PagerDuty alerting config shouldn't have been nil")
+	}
+	if !config.Alerting.Custom.IsValid() {
+		t.Error("Custom alerting config should've been valid")
+	}
+	if config.Alerting.Custom.Method != "POST" {
+		t.Error("config.Alerting.Custom.Method should've been POST")
+	}
+	if !config.Alerting.Custom.Insecure {
+		t.Error("config.Alerting.Custom.Insecure shouldn't have been true")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithInvalidSecurityConfig(t *testing.T) {
+	defer func() { recover() }()
+	_, _ = parseAndValidateConfigBytes([]byte(`
+security:
+  basic:
+    username: "admin"
+    password-sha512: "invalid-sha512-hash"
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`))
+	t.Error("Function should've panicked")
+}
+
+func TestParseAndValidateConfigBytesWithValidSecurityConfig(t *testing.T) {
+	const expectedUsername = "admin"
+	const expectedPasswordHash = "6b97ed68d14eb3f1aa959ce5d49c7dc612e1eb1dafd73b1e705847483fd6a6c809f2ceb4e8df6ff9984c6298ff0285cace6614bf8daa9f0070101b6c89899e22"
+	config, err := parseAndValidateConfigBytes([]byte(fmt.Sprintf(`
+security:
+  basic:
+    username: "%s"
+    password-sha512: "%s"
+services:
+  - name: twinnation
+    url: https://twinnation.org/health
+    conditions:
+      - "[STATUS] == 200"
+`, expectedUsername, expectedPasswordHash)))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Security == nil {
+		t.Fatal("config.Security shouldn't have been nil")
+	}
+	if !config.Security.IsValid() {
+		t.Error("Security config should've been valid")
+	}
+	if config.Security.Basic == nil {
+		t.Fatal("config.Security.Basic shouldn't have been nil")
+	}
+	if config.Security.Basic.Username != expectedUsername {
+		t.Errorf("config.Security.Basic.Username should've been %s, but was %s", expectedUsername, config.Security.Basic.Username)
+	}
+	if config.Security.Basic.PasswordSha512Hash != expectedPasswordHash {
+		t.Errorf("config.Security.Basic.PasswordSha512Hash should've been %s, but was %s", expectedPasswordHash, config.Security.Basic.PasswordSha512Hash)
+	}
+}
+
+func TestParseAndValidateConfigBytesWithNoServicesOrAutoDiscovery(t *testing.T) {
+	_, err := parseAndValidateConfigBytes([]byte(``))
+	if err != ErrNoServiceInConfig {
+		t.Error("The error returned should have been of type ErrNoServiceInConfig")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithKubernetesAutoDiscovery(t *testing.T) {
+	var kubernetesServices []v1.Service
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-1", "default", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-2", "default", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-2-canary", "default", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-3", "kube-system", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-4", "tools", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-5", "tools", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-6", "tools", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-7", "metrics", 8080))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-7-canary", "metrics", 8080))
+	k8stest.InitializeMockedKubernetesClient(kubernetesServices)
+	config, err := parseAndValidateConfigBytes([]byte(`
+debug: true
+
+kubernetes:
+  cluster-mode: "mock"
+  auto-discover: true
+  excluded-service-suffixes:
+    - canary
+  service-template:
+    interval: 29s
+    conditions:
+      - "[STATUS] == 200"
+  namespaces:
+    - name: default
+      hostname-suffix: ".default.svc.cluster.local"
+      target-path: "/health"
+    - name: tools
+      hostname-suffix: ".tools.svc.cluster.local"
+      target-path: "/health"
+      excluded-services:
+        - service-6
+    - name: metrics
+      hostname-suffix: ".metrics.svc.cluster.local"
+      target-path: "/health"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Kubernetes == nil {
+		t.Fatal("Kuberbetes config shouldn't have been nil")
+	}
+	if len(config.Services) != 5 {
+		t.Error("Expected 5 services to have been added through k8s auto discovery, got", len(config.Services))
+	}
+	for _, service := range config.Services {
+		if service.Name == "service-2-canary" || service.Name == "service-7-canary" {
+			t.Errorf("service '%s' should've been excluded because excluded-service-suffixes has 'canary'", service.Name)
+		} else if service.Name == "service-6" {
+			t.Errorf("service '%s' should've been excluded because excluded-services has 'service-6'", service.Name)
+		} else if service.Name == "service-3" {
+			t.Errorf("service '%s' should've been excluded because the namespace 'kube-system' is not configured for auto discovery", service.Name)
+		} else {
+			if service.Interval != 29*time.Second {
+				t.Errorf("service '%s' should've had an interval of 29s, because the template is configured for it", service.Name)
+			}
+			if len(service.Conditions) != 1 {
+				t.Errorf("service '%s' should've had 1 condition", service.Name)
+			}
+			if len(service.Conditions) == 1 && *service.Conditions[0] != "[STATUS] == 200" {
+				t.Errorf("service '%s' should've had the condition '[STATUS] == 200', because the template is configured for it", service.Name)
+			}
+			if !strings.HasSuffix(service.URL, ".svc.cluster.local:8080/health") {
+				t.Errorf("service '%s' should've had an URL with the suffix '.svc.cluster.local:8080/health'", service.Name)
+			}
+		}
+	}
+}
+
+func TestParseAndValidateConfigBytesWithKubernetesAutoDiscoveryButNoServiceTemplate(t *testing.T) {
+	defer func() { recover() }()
+	_, _ = parseAndValidateConfigBytes([]byte(`
+kubernetes:
+  cluster-mode: "mock"
+  auto-discover: true
+  namespaces:
+    - name: default
+      hostname-suffix: ".default.svc.cluster.local"
+      target-path: "/health"
+`))
+	t.Error("Function should've panicked because providing a service-template is mandatory")
+}
+
+func TestParseAndValidateConfigBytesWithKubernetesAutoDiscoveryUsingClusterModeIn(t *testing.T) {
+	defer func() { recover() }()
+	_, _ = parseAndValidateConfigBytes([]byte(`
+kubernetes:
+  cluster-mode: "in"
+  auto-discover: true
+  service-template:
+    interval: 30s
+    conditions:
+      - "[STATUS] == 200"
+  namespaces:
+    - name: default
+      hostname-suffix: ".default.svc.cluster.local"
+      target-path: "/health"
+`))
+	// TODO: find a way to test this?
+	t.Error("Function should've panicked because testing with ClusterModeIn isn't supported")
+}

config/web.go

@@ -0,0 +1,63 @@
+package config
+
+import (
+	"fmt"
+	"math"
+	"net/url"
+	"strings"
+)
+
+// webConfig is the structure which supports the configuration of the endpoint
+// which provides access to the web frontend
+type webConfig struct {
+	// Address to listen on (defaults to 0.0.0.0 specified by DefaultAddress)
+	Address string `yaml:"address"`
+
+	// Port to listen on (default to 8080 specified by DefaultPort)
+	Port int `yaml:"port"`
+
+	// ContextRoot set the root context for the web application
+	ContextRoot string `yaml:"context-root"`
+}
+
+// validateAndSetDefaults checks and sets the default values for fields that are not set
+func (web *webConfig) validateAndSetDefaults() {
+	// Validate the Address
+	if len(web.Address) == 0 {
+		web.Address = DefaultAddress
+	}
+	// Validate the Port
+	if web.Port == 0 {
+		web.Port = DefaultPort
+	} else if web.Port < 0 || web.Port > math.MaxUint16 {
+		panic(fmt.Sprintf("invalid port: value should be between %d and %d", 0, math.MaxUint16))
+	}
+	// Validate the ContextRoot
+	if len(web.ContextRoot) == 0 {
+		web.ContextRoot = DefaultContextRoot
+	} else {
+		trimmedContextRoot := strings.Trim(web.ContextRoot, "/")
+		if len(trimmedContextRoot) == 0 {
+			web.ContextRoot = DefaultContextRoot
+			return
+		}
+		rootContextURL, err := url.Parse(trimmedContextRoot)
+		if err != nil {
+			panic("invalid context root:" + err.Error())
+		}
+		if rootContextURL.Path != trimmedContextRoot {
+			panic("invalid context root: too complex")
+		}
+		web.ContextRoot = "/" + strings.Trim(rootContextURL.Path, "/") + "/"
+	}
+}
+
+// SocketAddress returns the combination of the Address and the Port
+func (web *webConfig) SocketAddress() string {
+	return fmt.Sprintf("%s:%d", web.Address, web.Port)
+}
+
+// PrependWithContextRoot appends the given path to the ContextRoot
+func (web *webConfig) PrependWithContextRoot(path string) string {
+	return web.ContextRoot + strings.Trim(path, "/")
+}

config/web_test.go

@@ -0,0 +1,99 @@
+package config
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestWebConfig_SocketAddress(t *testing.T) {
+	web := &webConfig{
+		Address: "0.0.0.0",
+		Port:    8081,
+	}
+	if web.SocketAddress() != "0.0.0.0:8081" {
+		t.Errorf("expected %s, got %s", "0.0.0.0:8081", web.SocketAddress())
+	}
+}
+
+func TestWebConfig_PrependWithContextRoot(t *testing.T) {
+	web := &webConfig{ContextRoot: "/status/"}
+	if result := web.PrependWithContextRoot("/api/v1/results"); result != "/status/api/v1/results" {
+		t.Errorf("expected %s, got %s", "/status/api/v1/results", result)
+	}
+	if result := web.PrependWithContextRoot("/health"); result != "/status/health" {
+		t.Errorf("expected %s, got %s", "/status/health", result)
+	}
+	if result := web.PrependWithContextRoot("/health/"); result != "/status/health" {
+		t.Errorf("expected %s, got %s", "/status/health", result)
+	}
+}
+
+// validContextRootTest specifies all test case which should end up in
+// a valid context root used to bind the web interface to
+var validContextRootTests = []struct {
+	name         string
+	path         string
+	expectedPath string
+}{
+	{"Empty", "", "/"},
+	{"/", "/", "/"},
+	{"///", "///", "/"},
+	{"Single character 'a'", "a", "/a/"},
+	{"Slash at the beginning", "/status", "/status/"},
+	{"Slashes at start and end", "/status/", "/status/"},
+	{"Multiple slashes at start", "//status", "/status/"},
+	{"Multiple slashes at start and end", "///status////", "/status/"},
+	{"Contains '@' in path'", "me@/status/gatus", "/me@/status/gatus/"},
+	{"Nested context with trailing slash", "/status/gatus/", "/status/gatus/"},
+	{"Nested context without trailing slash", "/status/gatus/system", "/status/gatus/system/"},
+}
+
+func TestWebConfig_ValidContextRoots(t *testing.T) {
+	for idx, test := range validContextRootTests {
+		t.Run(fmt.Sprintf("%d: %s", idx, test.name), func(t *testing.T) {
+			expectValidResultForContextRoot(t, test.path, test.expectedPath)
+		})
+	}
+}
+
+func expectValidResultForContextRoot(t *testing.T, path string, expected string) {
+	web := &webConfig{
+		ContextRoot: path,
+	}
+	web.validateAndSetDefaults()
+	if web.ContextRoot != expected {
+		t.Errorf("expected %s, got %s", expected, web.ContextRoot)
+	}
+}
+
+// invalidContextRootTests contains all tests for context root which are
+// expected to fail and stop program execution
+var invalidContextRootTests = []struct {
+	name string
+	path string
+}{
+	{"Only a fragment identifier", "#"},
+	{"Invalid character in path", "/invalid" + string([]byte{0x7F})},
+	{"Starts with protocol", "http://status/gatus"},
+	{"Path with fragment", "/status/gatus#here"},
+	{"Starts with '://'", "://status"},
+	{"Contains query parameter", "/status/h?ello=world"},
+	{"Contains '?'", "/status?"},
+}
+
+func TestWebConfig_InvalidContextRoots(t *testing.T) {
+	for idx, test := range invalidContextRootTests {
+		t.Run(fmt.Sprintf("%d: %s", idx, test.name), func(t *testing.T) {
+			expectInvalidResultForContextRoot(t, test.path)
+		})
+	}
+}
+
+func expectInvalidResultForContextRoot(t *testing.T, path string) {
+	defer func() { recover() }()
+
+	web := &webConfig{ContextRoot: path}
+	web.validateAndSetDefaults()
+
+	t.Fatal(fmt.Sprintf("Should've panicked because the configuration specifies an invalid context root: %s", path))
+}

controller/badge.go

@@ -0,0 +1,108 @@
+package controller
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/watchdog"
+	"github.com/gorilla/mux"
+)
+
+// badgeHandler handles the automatic generation of badge based on the group name and service name passed.
+//
+// Valid values for {duration}: 7d, 24h, 1h
+// Pattern for {identifier}: group-<GROUP_NAME>-service-<SERVICE_NAME>.svg
+func badgeHandler(writer http.ResponseWriter, request *http.Request) {
+	variables := mux.Vars(request)
+	duration := variables["duration"]
+	// group-<GROUP_NAME>-service-<SERVICE_NAME>.svg
+	identifier := variables["identifier"]
+	if duration != "7d" && duration != "24h" && duration != "1h" {
+		writer.WriteHeader(http.StatusBadRequest)
+		_, _ = writer.Write([]byte("Durations supported: 7d, 24h, 1h"))
+		return
+	}
+	parts := strings.Split(identifier, "-service-")
+	if len(parts) != 2 || !strings.HasPrefix(identifier, "group-") || !strings.HasSuffix(identifier, ".svg") {
+		writer.WriteHeader(http.StatusBadRequest)
+		_, _ = writer.Write([]byte("Invalid path: Pattern should look like /group-<GROUP_NAME>-service-<SERVICE_NAME>.svg"))
+		return
+	}
+	groupName := strings.TrimPrefix(parts[0], "group-")
+	serviceName := strings.TrimSuffix(parts[1], ".svg")
+	uptime := watchdog.GetUptimeByServiceGroupAndName(groupName, serviceName)
+	if uptime == nil {
+		writer.WriteHeader(http.StatusNotFound)
+		_, _ = writer.Write([]byte("Requested service not found"))
+		return
+	}
+	formattedDate := time.Now().Format(http.TimeFormat)
+	writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	writer.Header().Set("Date", formattedDate)
+	writer.Header().Set("Expires", formattedDate)
+	writer.Header().Set("Content-Type", "image/svg+xml")
+	_, _ = writer.Write(generateSVG(duration, uptime))
+}
+
+func generateSVG(duration string, uptime *core.Uptime) []byte {
+	var labelWidth, valueWidth, valueWidthAdjustment int
+	var color string
+	var value float64
+	switch duration {
+	case "7d":
+		labelWidth = 65
+		value = uptime.LastSevenDays
+	case "24h":
+		labelWidth = 70
+		value = uptime.LastTwentyFourHours
+	case "1h":
+		labelWidth = 65
+		value = uptime.LastHour
+	default:
+	}
+	if value >= 0.8 {
+		color = "#40cc11"
+	} else {
+		color = "#c7130a"
+	}
+	sanitizedValue := strings.TrimRight(strings.TrimRight(fmt.Sprintf("%.2f", value*100), "0"), ".") + "%"
+	if strings.Contains(sanitizedValue, ".") {
+		valueWidthAdjustment = -10
+	}
+	valueWidth = (len(sanitizedValue) * 11) + valueWidthAdjustment
+	width := labelWidth + valueWidth
+	labelX := labelWidth / 2
+	valueX := labelWidth + (valueWidth / 2)
+	svg := []byte(fmt.Sprintf(`<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="20">
+  <linearGradient id="b" x2="0" y2="100%%">
+    <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
+    <stop offset="1" stop-opacity=".1"/>
+  </linearGradient>
+  <mask id="a">
+    <rect width="%d" height="20" rx="3" fill="#fff"/>
+  </mask>
+  <g mask="url(#a)">
+    <path fill="#555" d="M0 0h%dv20H0z"/>
+    <path fill="%s" d="M%d 0h%dv20H%dz"/>
+    <path fill="url(#b)" d="M0 0h%dv20H0z"/>
+  </g>
+  <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
+    <text x="%d" y="15" fill="#010101" fill-opacity=".3">
+      uptime %s
+    </text>
+    <text x="%d" y="14">
+      uptime %s
+    </text>
+    <text x="%d" y="15" fill="#010101" fill-opacity=".3">
+      %s
+    </text>
+    <text x="%d" y="14">
+      %s
+    </text>
+  </g>
+</svg>`, width, width, labelWidth, color, labelWidth, valueWidth, labelWidth, width, labelX, duration, labelX, duration, valueX, sanitizedValue, valueX, sanitizedValue))
+	return svg
+}

controller/controller.go

@@ -0,0 +1,114 @@
+package controller
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/TwinProduction/gatus/config"
+	"github.com/TwinProduction/gatus/security"
+	"github.com/TwinProduction/gatus/watchdog"
+	"github.com/TwinProduction/gocache"
+	"github.com/gorilla/mux"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	cacheTTL = 10 * time.Second
+)
+
+var (
+	cache = gocache.NewCache().WithMaxSize(100).WithEvictionPolicy(gocache.LeastRecentlyUsed)
+)
+
+func init() {
+	if err := cache.StartJanitor(); err != nil {
+		log.Fatal("[controller][init] Failed to start cache janitor:", err.Error())
+	}
+}
+
+// Handle creates the router and starts the server
+func Handle() {
+	cfg := config.Get()
+	router := CreateRouter(cfg)
+	server := &http.Server{
+		Addr:         fmt.Sprintf("%s:%d", cfg.Web.Address, cfg.Web.Port),
+		Handler:      router,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 15 * time.Second,
+		IdleTimeout:  15 * time.Second,
+	}
+	log.Printf("[controller][Handle] Listening on %s%s\n", cfg.Web.SocketAddress(), cfg.Web.ContextRoot)
+	log.Fatal(server.ListenAndServe())
+}
+
+// CreateRouter creates the router for the http server
+func CreateRouter(cfg *config.Config) *mux.Router {
+	router := mux.NewRouter()
+	statusesHandler := serviceStatusesHandler
+	if cfg.Security != nil && cfg.Security.IsValid() {
+		statusesHandler = security.Handler(serviceStatusesHandler, cfg.Security)
+	}
+	router.HandleFunc("/favicon.ico", favIconHandler).Methods("GET") // favicon needs to be always served from the root
+	router.HandleFunc(cfg.Web.PrependWithContextRoot("/api/v1/statuses"), statusesHandler).Methods("GET")
+	router.HandleFunc(cfg.Web.PrependWithContextRoot("/api/v1/badges/uptime/{duration}/{identifier}"), badgeHandler).Methods("GET")
+	router.HandleFunc(cfg.Web.PrependWithContextRoot("/health"), healthHandler).Methods("GET")
+	router.PathPrefix(cfg.Web.ContextRoot).Handler(GzipHandler(http.StripPrefix(cfg.Web.ContextRoot, http.FileServer(http.Dir("./static")))))
+	if cfg.Metrics {
+		router.Handle(cfg.Web.PrependWithContextRoot("/metrics"), promhttp.Handler()).Methods("GET")
+	}
+	return router
+}
+
+func serviceStatusesHandler(writer http.ResponseWriter, r *http.Request) {
+	gzipped := strings.Contains(r.Header.Get("Accept-Encoding"), "gzip")
+	var exists bool
+	var value interface{}
+	if gzipped {
+		writer.Header().Set("Content-Encoding", "gzip")
+		value, exists = cache.Get("service-status-gzipped")
+	} else {
+		value, exists = cache.Get("service-status")
+	}
+	var data []byte
+	if !exists {
+		var err error
+		buffer := &bytes.Buffer{}
+		gzipWriter := gzip.NewWriter(buffer)
+		data, err = watchdog.GetServiceStatusesAsJSON()
+		if err != nil {
+			log.Printf("[main][serviceStatusesHandler] Unable to marshal object to JSON: %s", err.Error())
+			writer.WriteHeader(http.StatusInternalServerError)
+			_, _ = writer.Write([]byte("Unable to marshal object to JSON"))
+			return
+		}
+		_, _ = gzipWriter.Write(data)
+		_ = gzipWriter.Close()
+		gzippedData := buffer.Bytes()
+		cache.SetWithTTL("service-status", data, cacheTTL)
+		cache.SetWithTTL("service-status-gzipped", gzippedData, cacheTTL)
+		if gzipped {
+			data = gzippedData
+		}
+	} else {
+		data = value.([]byte)
+	}
+	writer.Header().Add("Content-Type", "application/json")
+	writer.WriteHeader(http.StatusOK)
+	_, _ = writer.Write(data)
+}
+
+func healthHandler(writer http.ResponseWriter, _ *http.Request) {
+	writer.Header().Add("Content-Type", "application/json")
+	writer.WriteHeader(http.StatusOK)
+	_, _ = writer.Write([]byte("{\"status\":\"UP\"}"))
+}
+
+// favIconHandler handles requests for /favicon.ico
+func favIconHandler(writer http.ResponseWriter, request *http.Request) {
+	http.ServeFile(writer, request, "./static/favicon.ico")
+}

controller/gzip.go

@@ -1,4 +1,4 @@
-package main
+package controller
 
 import (
 	"compress/gzip"
@@ -20,15 +20,20 @@ type gzipResponseWriter struct {
 	http.ResponseWriter
 }
 
+// WriteHeader sends an HTTP response header with the provided status code.
+// It also deletes the Content-Length header, since the GZIP compression may modify the size of the payload
 func (w *gzipResponseWriter) WriteHeader(status int) {
 	w.Header().Del("Content-Length")
 	w.ResponseWriter.WriteHeader(status)
 }
 
+// Write writes len(b) bytes from b to the underlying data stream.
 func (w *gzipResponseWriter) Write(b []byte) (int, error) {
 	return w.Writer.Write(b)
 }
 
+// GzipHandler compresses the response of a given handler if the request's headers specify that the client
+// supports gzip encoding
 func GzipHandler(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(writer http.ResponseWriter, r *http.Request) {
 		// If the request doesn't specify that it supports gzip, then don't compress it

core/alert.go

@@ -8,20 +8,47 @@ type Alert struct {
 	// Enabled defines whether or not the alert is enabled
 	Enabled bool `yaml:"enabled"`
 
-	// Threshold is the number of failures in a row needed before triggering the alert
-	Threshold int `yaml:"threshold"`
+	// FailureThreshold is the number of failures in a row needed before triggering the alert
+	FailureThreshold int `yaml:"failure-threshold"`
 
 	// Description of the alert. Will be included in the alert sent.
 	Description string `yaml:"description"`
 
 	// SendOnResolved defines whether to send a second notification when the issue has been resolved
 	SendOnResolved bool `yaml:"send-on-resolved"`
+
+	// SuccessThreshold defines how many successful executions must happen in a row before an ongoing incident is marked as resolved
+	SuccessThreshold int `yaml:"success-threshold"`
+
+	// ResolveKey is an optional field that is used by some providers (i.e. PagerDuty's dedup_key) to resolve
+	// ongoing/triggered incidents
+	ResolveKey string
+
+	// Triggered is used to determine whether an alert has been triggered. When an alert is resolved, this value
+	// should be set back to false. It is used to prevent the same alert from going out twice.
+	Triggered bool
 }
 
+// AlertType is the type of the alert.
+// The value will generally be the name of the alert provider
 type AlertType string
 
 const (
-	SlackAlert  AlertType = "slack"
+	// SlackAlert is the AlertType for the slack alerting provider
+	SlackAlert AlertType = "slack"
+
+	// MattermostAlert is the AlertType for the mattermost alerting provider
+	MattermostAlert AlertType = "mattermost"
+
+	// MessagebirdAlert is the AlertType for the messagebird alerting provider
+	MessagebirdAlert AlertType = "messagebird"
+
+	// PagerDutyAlert is the AlertType for the pagerduty alerting provider
+	PagerDutyAlert AlertType = "pagerduty"
+
+	// TwilioAlert is the AlertType for the twilio alerting provider
 	TwilioAlert AlertType = "twilio"
+
+	// CustomAlert is the AlertType for the custom alerting provider
 	CustomAlert AlertType = "custom"
 )

core/alerting.go

@@ -1,149 +0,0 @@
-package core
-
-import (
-	"bytes"
-	"encoding/base64"
-	"fmt"
-	"github.com/TwinProduction/gatus/client"
-	"net/http"
-	"net/url"
-	"strings"
-)
-
-type AlertingConfig struct {
-	Slack  string               `yaml:"slack"`
-	Twilio *TwilioAlertProvider `yaml:"twilio"`
-	Custom *CustomAlertProvider `yaml:"custom"`
-}
-
-type TwilioAlertProvider struct {
-	SID   string `yaml:"sid"`
-	Token string `yaml:"token"`
-	From  string `yaml:"from"`
-	To    string `yaml:"to"`
-}
-
-func (provider *TwilioAlertProvider) IsValid() bool {
-	return len(provider.Token) > 0 && len(provider.SID) > 0 && len(provider.From) > 0 && len(provider.To) > 0
-}
-
-type CustomAlertProvider struct {
-	Url     string            `yaml:"url"`
-	Method  string            `yaml:"method,omitempty"`
-	Body    string            `yaml:"body,omitempty"`
-	Headers map[string]string `yaml:"headers,omitempty"`
-}
-
-func (provider *CustomAlertProvider) IsValid() bool {
-	return len(provider.Url) > 0
-}
-
-func (provider *CustomAlertProvider) buildRequest(serviceName, alertDescription string, resolved bool) *http.Request {
-	body := provider.Body
-	providerUrl := provider.Url
-	if strings.Contains(body, "[ALERT_DESCRIPTION]") {
-		body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alertDescription)
-	}
-	if strings.Contains(body, "[SERVICE_NAME]") {
-		body = strings.ReplaceAll(body, "[SERVICE_NAME]", serviceName)
-	}
-	if strings.Contains(body, "[ALERT_TRIGGERED_OR_RESOLVED]") {
-		if resolved {
-			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", "RESOLVED")
-		} else {
-			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", "TRIGGERED")
-		}
-	}
-	if strings.Contains(providerUrl, "[ALERT_DESCRIPTION]") {
-		providerUrl = strings.ReplaceAll(providerUrl, "[ALERT_DESCRIPTION]", alertDescription)
-	}
-	if strings.Contains(providerUrl, "[SERVICE_NAME]") {
-		providerUrl = strings.ReplaceAll(providerUrl, "[SERVICE_NAME]", serviceName)
-	}
-	if strings.Contains(providerUrl, "[ALERT_TRIGGERED_OR_RESOLVED]") {
-		if resolved {
-			providerUrl = strings.ReplaceAll(providerUrl, "[ALERT_TRIGGERED_OR_RESOLVED]", "RESOLVED")
-		} else {
-			providerUrl = strings.ReplaceAll(providerUrl, "[ALERT_TRIGGERED_OR_RESOLVED]", "TRIGGERED")
-		}
-	}
-	bodyBuffer := bytes.NewBuffer([]byte(body))
-	request, _ := http.NewRequest(provider.Method, providerUrl, bodyBuffer)
-	for k, v := range provider.Headers {
-		request.Header.Set(k, v)
-	}
-	return request
-}
-
-func (provider *CustomAlertProvider) Send(serviceName, alertDescription string, resolved bool) error {
-	request := provider.buildRequest(serviceName, alertDescription, resolved)
-	response, err := client.GetHttpClient().Do(request)
-	if err != nil {
-		return err
-	}
-	if response.StatusCode > 399 {
-		return fmt.Errorf("call to provider alert returned status code %d", response.StatusCode)
-	}
-	return nil
-}
-
-func CreateSlackCustomAlertProvider(slackWebHookUrl string, service *Service, alert *Alert, result *Result, resolved bool) *CustomAlertProvider {
-	var message string
-	var color string
-	if resolved {
-		message = fmt.Sprintf("An alert for *%s* has been resolved after %d failures in a row", service.Name, service.NumberOfFailuresInARow)
-		color = "#36A64F"
-	} else {
-		message = fmt.Sprintf("An alert for *%s* has been triggered", service.Name)
-		color = "#DD0000"
-	}
-	var results string
-	for _, conditionResult := range result.ConditionResults {
-		var prefix string
-		if conditionResult.Success {
-			prefix = ":heavy_check_mark:"
-		} else {
-			prefix = ":x:"
-		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
-	}
-	return &CustomAlertProvider{
-		Url:    slackWebHookUrl,
-		Method: "POST",
-		Body: fmt.Sprintf(`{
-  "text": "",
-  "attachments": [
-    {
-      "title": ":helmet_with_white_cross: Gatus",
-      "text": "%s:\n> %s",
-      "short": false,
-      "color": "%s",
-      "fields": [
-        {
-          "title": "Condition results",
-          "value": "%s",
-          "short": false
-        }
-      ]
-    },
-  ]
-}`, message, alert.Description, color, results),
-		Headers: map[string]string{"Content-Type": "application/json"},
-	}
-}
-
-func CreateTwilioCustomAlertProvider(provider *TwilioAlertProvider, message string) *CustomAlertProvider {
-	return &CustomAlertProvider{
-		Url:    fmt.Sprintf("https://api.twilio.com/2010-04-01/Accounts/%s/Messages.json", provider.SID),
-		Method: "POST",
-		Body: url.Values{
-			"To":   {provider.To},
-			"From": {provider.From},
-			"Body": {message},
-		}.Encode(),
-		Headers: map[string]string{
-			"Content-Type":  "application/x-www-form-urlencoded",
-			"Authorization": fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", provider.SID, provider.Token)))),
-		},
-	}
-}

core/alerting_test.go

@@ -1,48 +0,0 @@
-package core
-
-import (
-	"io/ioutil"
-	"testing"
-)
-
-func TestCustomAlertProvider_buildRequestWhenResolved(t *testing.T) {
-	const (
-		ExpectedUrl  = "http://example.com/service-name"
-		ExpectedBody = "service-name,alert-description,RESOLVED"
-	)
-	customAlertProvider := &CustomAlertProvider{
-		Url:     "http://example.com/[SERVICE_NAME]",
-		Method:  "GET",
-		Body:    "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
-		Headers: nil,
-	}
-	request := customAlertProvider.buildRequest("service-name", "alert-description", true)
-	if request.URL.String() != ExpectedUrl {
-		t.Error("expected URL to be", ExpectedUrl, "was", request.URL.String())
-	}
-	body, _ := ioutil.ReadAll(request.Body)
-	if string(body) != ExpectedBody {
-		t.Error("expected body to be", ExpectedBody, "was", string(body))
-	}
-}
-
-func TestCustomAlertProvider_buildRequestWhenTriggered(t *testing.T) {
-	const (
-		ExpectedUrl  = "http://example.com/service-name"
-		ExpectedBody = "service-name,alert-description,TRIGGERED"
-	)
-	customAlertProvider := &CustomAlertProvider{
-		Url:     "http://example.com/[SERVICE_NAME]",
-		Method:  "GET",
-		Body:    "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
-		Headers: nil,
-	}
-	request := customAlertProvider.buildRequest("service-name", "alert-description", false)
-	if request.URL.String() != ExpectedUrl {
-		t.Error("expected URL to be", ExpectedUrl, "was", request.URL.String())
-	}
-	body, _ := ioutil.ReadAll(request.Body)
-	if string(body) != ExpectedBody {
-		t.Error("expected body to be", ExpectedBody, "was", string(body))
-	}
-}

core/condition-result.go

@@ -0,0 +1,10 @@
+package core
+
+// ConditionResult result of a Condition
+type ConditionResult struct {
+	// Condition that was evaluated
+	Condition string `json:"condition"`
+
+	// Success whether the condition was met (successful) or not (failed)
+	Success bool `json:"success"`
+}

core/condition.go

@@ -3,22 +3,78 @@ package core
 import (
 	"fmt"
 	"log"
+	"strconv"
 	"strings"
+	"time"
+
+	"github.com/TwinProduction/gatus/jsonpath"
+	"github.com/TwinProduction/gatus/pattern"
 )
 
+const (
+	// StatusPlaceholder is a placeholder for a HTTP status.
+	//
+	// Values that could replace the placeholder: 200, 404, 500, ...
+	StatusPlaceholder = "[STATUS]"
+
+	// IPPlaceholder is a placeholder for an IP.
+	//
+	// Values that could replace the placeholder: 127.0.0.1, 10.0.0.1, ...
+	IPPlaceholder = "[IP]"
+
+	// DNSRCodePlaceholder is a place holder for DNS_RCODE
+	//
+	// Values that could be NOERROR, FORMERR, SERVFAIL, NXDOMAIN, NOTIMP and REFUSED
+	DNSRCodePlaceholder = "[DNS_RCODE]"
+
+	// ResponseTimePlaceholder is a placeholder for the request response time, in milliseconds.
+	//
+	// Values that could replace the placeholder: 1, 500, 1000, ...
+	ResponseTimePlaceholder = "[RESPONSE_TIME]"
+
+	// BodyPlaceholder is a placeholder for the body of the response
+	//
+	// Values that could replace the placeholder: {}, {"data":{"name":"john"}}, ...
+	BodyPlaceholder = "[BODY]"
+
+	// ConnectedPlaceholder is a placeholder for whether a connection was successfully established.
+	//
+	// Values that could replace the placeholder: true, false
+	ConnectedPlaceholder = "[CONNECTED]"
+
+	// CertificateExpirationPlaceholder is a placeholder for the duration before certificate expiration, in milliseconds.
+	//
+	// Values that could replace the placeholder: 4461677039 (~52 days)
+	CertificateExpirationPlaceholder = "[CERTIFICATE_EXPIRATION]"
+
+	// LengthFunctionPrefix is the prefix for the length function
+	LengthFunctionPrefix = "len("
+
+	// PatternFunctionPrefix is the prefix for the pattern function
+	PatternFunctionPrefix = "pat("
+
+	// FunctionSuffix is the suffix for all functions
+	FunctionSuffix = ")"
+
+	// InvalidConditionElementSuffix is the suffix that will be appended to an invalid condition
+	InvalidConditionElementSuffix = "(INVALID)"
+)
+
+// Condition is a condition that needs to be met in order for a Service to be considered healthy.
 type Condition string
 
+// evaluate the Condition with the Result of the health check
 func (c *Condition) evaluate(result *Result) bool {
 	condition := string(*c)
 	success := false
 	var resolvedCondition string
 	if strings.Contains(condition, "==") {
 		parts := sanitizeAndResolve(strings.Split(condition, "=="), result)
-		success = parts[0] == parts[1]
+		success = isEqual(parts[0], parts[1])
 		resolvedCondition = fmt.Sprintf("%v == %v", parts[0], parts[1])
 	} else if strings.Contains(condition, "!=") {
 		parts := sanitizeAndResolve(strings.Split(condition, "!="), result)
-		success = parts[0] != parts[1]
+		success = !isEqual(parts[0], parts[1])
 		resolvedCondition = fmt.Sprintf("%v != %v", parts[0], parts[1])
 	} else if strings.Contains(condition, "<=") {
 		parts := sanitizeAndResolveNumerical(strings.Split(condition, "<="), result)
@@ -44,8 +100,108 @@ func (c *Condition) evaluate(result *Result) bool {
 	// If the condition isn't a success, return what the resolved condition was too
 	if !success {
 		log.Printf("[Condition][evaluate] Condition '%s' did not succeed because '%s' is false", condition, resolvedCondition)
-		conditionToDisplay = fmt.Sprintf("%s (%s)", condition, resolvedCondition)
+		// Check if the resolved condition was an invalid path
+		isResolvedConditionInvalidPath := strings.ReplaceAll(resolvedCondition, fmt.Sprintf("%s ", InvalidConditionElementSuffix), "") == condition
+		if isResolvedConditionInvalidPath {
+			// Since, in the event of an invalid path, the resolvedCondition contains the condition itself,
+			// we'll only display the resolvedCondition
+			conditionToDisplay = resolvedCondition
+		} else {
+			conditionToDisplay = fmt.Sprintf("%s (%s)", condition, resolvedCondition)
+		}
 	}
 	result.ConditionResults = append(result.ConditionResults, &ConditionResult{Condition: conditionToDisplay, Success: success})
 	return success
 }
+
+// isEqual compares two strings.
+//
+// It also supports the pattern function. That is to say, if one of the strings starts with PatternFunctionPrefix
+// and ends with FunctionSuffix, it will be treated like a pattern.
+func isEqual(first, second string) bool {
+	var isFirstPattern, isSecondPattern bool
+	if strings.HasPrefix(first, PatternFunctionPrefix) && strings.HasSuffix(first, FunctionSuffix) {
+		isFirstPattern = true
+		first = strings.TrimSuffix(strings.TrimPrefix(first, PatternFunctionPrefix), FunctionSuffix)
+	}
+	if strings.HasPrefix(second, PatternFunctionPrefix) && strings.HasSuffix(second, FunctionSuffix) {
+		isSecondPattern = true
+		second = strings.TrimSuffix(strings.TrimPrefix(second, PatternFunctionPrefix), FunctionSuffix)
+	}
+	if isFirstPattern && !isSecondPattern {
+		return pattern.Match(first, second)
+	} else if !isFirstPattern && isSecondPattern {
+		return pattern.Match(second, first)
+	} else {
+		return first == second
+	}
+}
+
+// sanitizeAndResolve sanitizes and resolves a list of element and returns the list of resolved elements
+func sanitizeAndResolve(list []string, result *Result) []string {
+	var sanitizedList []string
+	body := strings.TrimSpace(string(result.Body))
+	for _, element := range list {
+		element = strings.TrimSpace(element)
+		switch strings.ToUpper(element) {
+		case StatusPlaceholder:
+			element = strconv.Itoa(result.HTTPStatus)
+		case IPPlaceholder:
+			element = result.IP
+		case ResponseTimePlaceholder:
+			element = strconv.Itoa(int(result.Duration.Milliseconds()))
+		case BodyPlaceholder:
+			element = body
+		case DNSRCodePlaceholder:
+			element = result.DNSRCode
+		case ConnectedPlaceholder:
+			element = strconv.FormatBool(result.Connected)
+		case CertificateExpirationPlaceholder:
+			element = strconv.FormatInt(result.CertificateExpiration.Milliseconds(), 10)
+		default:
+			// if contains the BodyPlaceholder, then evaluate json path
+			if strings.Contains(element, BodyPlaceholder) {
+				wantLength := false
+				if strings.HasPrefix(element, LengthFunctionPrefix) && strings.HasSuffix(element, FunctionSuffix) {
+					wantLength = true
+					element = strings.TrimSuffix(strings.TrimPrefix(element, LengthFunctionPrefix), FunctionSuffix)
+				}
+				resolvedElement, resolvedElementLength, err := jsonpath.Eval(strings.Replace(element, fmt.Sprintf("%s.", BodyPlaceholder), "", 1), result.Body)
+				if err != nil {
+					if err.Error() != "unexpected end of JSON input" {
+						result.Errors = append(result.Errors, err.Error())
+					}
+					if wantLength {
+						element = fmt.Sprintf("%s%s%s %s", LengthFunctionPrefix, element, FunctionSuffix, InvalidConditionElementSuffix)
+					} else {
+						element = fmt.Sprintf("%s %s", element, InvalidConditionElementSuffix)
+					}
+				} else {
+					if wantLength {
+						element = fmt.Sprintf("%d", resolvedElementLength)
+					} else {
+						element = resolvedElement
+					}
+				}
+			}
+		}
+		sanitizedList = append(sanitizedList, element)
+	}
+	return sanitizedList
+}
+
+func sanitizeAndResolveNumerical(list []string, result *Result) []int64 {
+	var sanitizedNumbers []int64
+	sanitizedList := sanitizeAndResolve(list, result)
+	for _, element := range sanitizedList {
+		if duration, err := time.ParseDuration(element); duration != 0 && err == nil {
+			sanitizedNumbers = append(sanitizedNumbers, duration.Milliseconds())
+		} else if number, err := strconv.ParseInt(element, 10, 64); err != nil {
+			// Default to 0 if the string couldn't be converted to an integer
+			sanitizedNumbers = append(sanitizedNumbers, 0)
+		} else {
+			sanitizedNumbers = append(sanitizedNumbers, number)
+		}
+	}
+	return sanitizedNumbers
+}

core/condition_test.go

@@ -1,13 +1,14 @@
 package core
 
 import (
+	"strconv"
 	"testing"
 	"time"
 )
 
-func TestCondition_evaluateWithIp(t *testing.T) {
+func TestCondition_evaluateWithIP(t *testing.T) {
 	condition := Condition("[IP] == 127.0.0.1")
-	result := &Result{Ip: "127.0.0.1"}
+	result := &Result{IP: "127.0.0.1"}
 	condition.evaluate(result)
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
@@ -16,7 +17,7 @@ func TestCondition_evaluateWithIp(t *testing.T) {
 
 func TestCondition_evaluateWithStatus(t *testing.T) {
 	condition := Condition("[STATUS] == 201")
-	result := &Result{HttpStatus: 201}
+	result := &Result{HTTPStatus: 201}
 	condition.evaluate(result)
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
@@ -25,7 +26,7 @@ func TestCondition_evaluateWithStatus(t *testing.T) {
 
 func TestCondition_evaluateWithStatusFailure(t *testing.T) {
 	condition := Condition("[STATUS] == 200")
-	result := &Result{HttpStatus: 500}
+	result := &Result{HTTPStatus: 500}
 	condition.evaluate(result)
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
@@ -34,7 +35,7 @@ func TestCondition_evaluateWithStatusFailure(t *testing.T) {
 
 func TestCondition_evaluateWithStatusUsingLessThan(t *testing.T) {
 	condition := Condition("[STATUS] < 300")
-	result := &Result{HttpStatus: 201}
+	result := &Result{HTTPStatus: 201}
 	condition.evaluate(result)
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
@@ -43,7 +44,7 @@ func TestCondition_evaluateWithStatusUsingLessThan(t *testing.T) {
 
 func TestCondition_evaluateWithStatusFailureUsingLessThan(t *testing.T) {
 	condition := Condition("[STATUS] < 300")
-	result := &Result{HttpStatus: 404}
+	result := &Result{HTTPStatus: 404}
 	condition.evaluate(result)
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
@@ -59,7 +60,27 @@ func TestCondition_evaluateWithResponseTimeUsingLessThan(t *testing.T) {
 	}
 }
 
+func TestCondition_evaluateWithResponseTimeUsingLessThanDuration(t *testing.T) {
+	condition := Condition("[RESPONSE_TIME] < 1s")
+	result := &Result{Duration: time.Millisecond * 50}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithResponseTimeUsingLessThanInvalid(t *testing.T) {
+	condition := Condition("[RESPONSE_TIME] < potato")
+	result := &Result{Duration: time.Millisecond * 50}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have failed because the condition has an invalid numerical value that should've automatically resolved to 0", condition)
+	}
+}
+
 func TestCondition_evaluateWithResponseTimeUsingGreaterThan(t *testing.T) {
+	// Not exactly sure why you'd want to have a condition that checks if the response time is too fast,
+	// but hey, who am I to judge?
 	condition := Condition("[RESPONSE_TIME] > 500")
 	result := &Result{Duration: time.Millisecond * 750}
 	condition.evaluate(result)
@@ -68,6 +89,15 @@ func TestCondition_evaluateWithResponseTimeUsingGreaterThan(t *testing.T) {
 	}
 }
 
+func TestCondition_evaluateWithResponseTimeUsingGreaterThanDuration(t *testing.T) {
+	condition := Condition("[RESPONSE_TIME] > 1s")
+	result := &Result{Duration: time.Second * 2}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
 func TestCondition_evaluateWithResponseTimeUsingGreaterThanOrEqualTo(t *testing.T) {
 	condition := Condition("[RESPONSE_TIME] >= 500")
 	result := &Result{Duration: time.Millisecond * 500}
@@ -95,7 +125,7 @@ func TestCondition_evaluateWithBody(t *testing.T) {
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPath(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPath(t *testing.T) {
 	condition := Condition("[BODY].status == UP")
 	result := &Result{Body: []byte("{\"status\":\"UP\"}")}
 	condition.evaluate(result)
@@ -104,7 +134,7 @@ func TestCondition_evaluateWithBodyJsonPath(t *testing.T) {
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathComplex(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPathComplex(t *testing.T) {
 	condition := Condition("[BODY].data.name == john")
 	result := &Result{Body: []byte("{\"data\": {\"id\": 1, \"name\": \"john\"}}")}
 	condition.evaluate(result)
@@ -113,7 +143,51 @@ func TestCondition_evaluateWithBodyJsonPathComplex(t *testing.T) {
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathLongInt(t *testing.T) {
+func TestCondition_evaluateWithInvalidBodyJSONPathComplex(t *testing.T) {
+	expectedResolvedCondition := "[BODY].data.name (INVALID) == john"
+	condition := Condition("[BODY].data.name == john")
+	result := &Result{Body: []byte("{\"data\": {\"id\": 1}}")}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure, because the path was invalid", condition)
+	}
+	if result.ConditionResults[0].Condition != expectedResolvedCondition {
+		t.Errorf("Condition '%s' should have resolved to '%s', but resolved to '%s' instead", condition, expectedResolvedCondition, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithInvalidBodyJSONPathComplexWithLengthFunction(t *testing.T) {
+	expectedResolvedCondition := "len([BODY].data.name) (INVALID) == john"
+	condition := Condition("len([BODY].data.name) == john")
+	result := &Result{Body: []byte("{\"data\": {\"id\": 1}}")}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure, because the path was invalid", condition)
+	}
+	if result.ConditionResults[0].Condition != expectedResolvedCondition {
+		t.Errorf("Condition '%s' should have resolved to '%s', but resolved to '%s' instead", condition, expectedResolvedCondition, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyJSONPathDoublePlaceholders(t *testing.T) {
+	condition := Condition("[BODY].user.firstName != [BODY].user.lastName")
+	result := &Result{Body: []byte("{\"user\": {\"firstName\": \"john\", \"lastName\": \"doe\"}}")}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyJSONPathDoublePlaceholdersFailure(t *testing.T) {
+	condition := Condition("[BODY].user.firstName == [BODY].user.lastName")
+	result := &Result{Body: []byte("{\"user\": {\"firstName\": \"john\", \"lastName\": \"doe\"}}")}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyJSONPathLongInt(t *testing.T) {
 	condition := Condition("[BODY].data.id == 1")
 	result := &Result{Body: []byte("{\"data\": {\"id\": 1}}")}
 	condition.evaluate(result)
@@ -122,7 +196,7 @@ func TestCondition_evaluateWithBodyJsonPathLongInt(t *testing.T) {
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathComplexInt(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPathComplexInt(t *testing.T) {
 	condition := Condition("[BODY].data[1].id == 2")
 	result := &Result{Body: []byte("{\"data\": [{\"id\": 1}, {\"id\": 2}, {\"id\": 3}]}")}
 	condition.evaluate(result)
@@ -131,7 +205,7 @@ func TestCondition_evaluateWithBodyJsonPathComplexInt(t *testing.T) {
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathComplexIntUsingGreaterThan(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPathComplexIntUsingGreaterThan(t *testing.T) {
 	condition := Condition("[BODY].data.id > 0")
 	result := &Result{Body: []byte("{\"data\": {\"id\": 1}}")}
 	condition.evaluate(result)
@@ -140,7 +214,7 @@ func TestCondition_evaluateWithBodyJsonPathComplexIntUsingGreaterThan(t *testing
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathComplexIntFailureUsingGreaterThan(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPathComplexIntFailureUsingGreaterThan(t *testing.T) {
 	condition := Condition("[BODY].data.id > 5")
 	result := &Result{Body: []byte("{\"data\": {\"id\": 1}}")}
 	condition.evaluate(result)
@@ -149,7 +223,7 @@ func TestCondition_evaluateWithBodyJsonPathComplexIntFailureUsingGreaterThan(t *
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathComplexIntUsingLessThan(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPathComplexIntUsingLessThan(t *testing.T) {
 	condition := Condition("[BODY].data.id < 5")
 	result := &Result{Body: []byte("{\"data\": {\"id\": 2}}")}
 	condition.evaluate(result)
@@ -158,7 +232,7 @@ func TestCondition_evaluateWithBodyJsonPathComplexIntUsingLessThan(t *testing.T)
 	}
 }
 
-func TestCondition_evaluateWithBodyJsonPathComplexIntFailureUsingLessThan(t *testing.T) {
+func TestCondition_evaluateWithBodyJSONPathComplexIntFailureUsingLessThan(t *testing.T) {
 	condition := Condition("[BODY].data.id < 5")
 	result := &Result{Body: []byte("{\"data\": {\"id\": 10}}")}
 	condition.evaluate(result)
@@ -184,3 +258,131 @@ func TestCondition_evaluateWithBodyStringLength(t *testing.T) {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
 }
+
+func TestCondition_evaluateWithBodyStringPattern(t *testing.T) {
+	condition := Condition("[BODY].name == pat(*ohn*)")
+	result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyStringPatternFailure(t *testing.T) {
+	condition := Condition("[BODY].name == pat(bob*)")
+	result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyPatternFailure(t *testing.T) {
+	condition := Condition("[BODY] == pat(*john*)")
+	result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithIPPattern(t *testing.T) {
+	condition := Condition("[IP] == pat(10.*)")
+	result := &Result{IP: "10.0.0.0"}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithIPPatternFailure(t *testing.T) {
+	condition := Condition("[IP] == pat(10.*)")
+	result := &Result{IP: "255.255.255.255"}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}
+
+func TestCondition_evaluateWithStatusPattern(t *testing.T) {
+	condition := Condition("[STATUS] == pat(4*)")
+	result := &Result{HTTPStatus: 404}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithStatusPatternFailure(t *testing.T) {
+	condition := Condition("[STATUS] != pat(4*)")
+	result := &Result{HTTPStatus: 404}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}
+
+func TestCondition_evaluateWithConnected(t *testing.T) {
+	condition := Condition("[CONNECTED] == true")
+	result := &Result{Connected: true}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithConnectedFailure(t *testing.T) {
+	condition := Condition("[CONNECTED] == true")
+	result := &Result{Connected: false}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}
+
+func TestCondition_evaluateWithUnsetCertificateExpiration(t *testing.T) {
+	condition := Condition("[CERTIFICATE_EXPIRATION] == 0")
+	result := &Result{}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithCertificateExpirationGreaterThanNumerical(t *testing.T) {
+	acceptable := (time.Hour * 24 * 28).Milliseconds()
+	condition := Condition("[CERTIFICATE_EXPIRATION] > " + strconv.FormatInt(acceptable, 10))
+	result := &Result{CertificateExpiration: time.Hour * 24 * 60}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithCertificateExpirationGreaterThanNumericalFailure(t *testing.T) {
+	acceptable := (time.Hour * 24 * 28).Milliseconds()
+	condition := Condition("[CERTIFICATE_EXPIRATION] > " + strconv.FormatInt(acceptable, 10))
+	result := &Result{CertificateExpiration: time.Hour * 24 * 14}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}
+
+func TestCondition_evaluateWithCertificateExpirationGreaterThanDuration(t *testing.T) {
+	condition := Condition("[CERTIFICATE_EXPIRATION] > 12h")
+	result := &Result{CertificateExpiration: 24 * time.Hour}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+}
+
+func TestCondition_evaluateWithCertificateExpirationGreaterThanDurationFailure(t *testing.T) {
+	condition := Condition("[CERTIFICATE_EXPIRATION] > 48h")
+	result := &Result{CertificateExpiration: 24 * time.Hour}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+}

core/dns.go

@@ -0,0 +1,85 @@
+package core
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/miekg/dns"
+)
+
+var (
+	// ErrDNSWithNoQueryName is the error with which gatus will panic if a dns is configured without query name
+	ErrDNSWithNoQueryName = errors.New("you must specify a query name for DNS")
+
+	// ErrDNSWithInvalidQueryType is the error with which gatus will panic if a dns is configured with invalid query type
+	ErrDNSWithInvalidQueryType = errors.New("invalid query type")
+)
+
+const (
+	dnsPort = 53
+)
+
+// DNS is the configuration for a Service of type DNS
+type DNS struct {
+	// QueryType is the type for the DNS records like A, AAAA, CNAME...
+	QueryType string `yaml:"query-type"`
+
+	// QueryName is the query for DNS
+	QueryName string `yaml:"query-name"`
+}
+
+func (d *DNS) validateAndSetDefault() {
+	if len(d.QueryName) == 0 {
+		panic(ErrDNSWithNoQueryName)
+	}
+	if !strings.HasSuffix(d.QueryName, ".") {
+		d.QueryName += "."
+	}
+	if _, ok := dns.StringToType[d.QueryType]; !ok {
+		panic(ErrDNSWithInvalidQueryType)
+	}
+}
+
+func (d *DNS) query(url string, result *Result) {
+	if !strings.Contains(url, ":") {
+		url = fmt.Sprintf("%s:%d", url, dnsPort)
+	}
+	queryType := dns.StringToType[d.QueryType]
+	c := new(dns.Client)
+	m := new(dns.Msg)
+	m.SetQuestion(d.QueryName, queryType)
+	r, _, err := c.Exchange(m, url)
+	if err != nil {
+		result.Errors = append(result.Errors, err.Error())
+		return
+	}
+	result.Connected = true
+	result.DNSRCode = dns.RcodeToString[r.Rcode]
+	for _, rr := range r.Answer {
+		switch rr.Header().Rrtype {
+		case dns.TypeA:
+			if a, ok := rr.(*dns.A); ok {
+				result.Body = []byte(a.A.String())
+			}
+		case dns.TypeAAAA:
+			if aaaa, ok := rr.(*dns.AAAA); ok {
+				result.Body = []byte(aaaa.AAAA.String())
+			}
+		case dns.TypeCNAME:
+			if cname, ok := rr.(*dns.CNAME); ok {
+				result.Body = []byte(cname.Target)
+			}
+		case dns.TypeMX:
+			if mx, ok := rr.(*dns.MX); ok {
+				result.Body = []byte(mx.Mx)
+			}
+		case dns.TypeNS:
+			if ns, ok := rr.(*dns.NS); ok {
+				result.Body = []byte(ns.Ns)
+			}
+		default:
+			result.Body = []byte("query type is not supported yet")
+		}
+	}
+}

core/dns_test.go

@@ -0,0 +1,124 @@
+package core
+
+import (
+	"testing"
+
+	"github.com/TwinProduction/gatus/pattern"
+)
+
+func TestIntegrationQuery(t *testing.T) {
+	tests := []struct {
+		name            string
+		inputDNS        DNS
+		inputURL        string
+		expectedDNSCode string
+		expectedBody    string
+		isErrExpected   bool
+	}{
+		{
+			name: "test DNS with type A",
+			inputDNS: DNS{
+				QueryType: "A",
+				QueryName: "example.com.",
+			},
+			inputURL:        "8.8.8.8",
+			expectedDNSCode: "NOERROR",
+			expectedBody:    "93.184.216.34",
+		},
+		{
+			name: "test DNS with type AAAA",
+			inputDNS: DNS{
+				QueryType: "AAAA",
+				QueryName: "example.com.",
+			},
+			inputURL:        "8.8.8.8",
+			expectedDNSCode: "NOERROR",
+			expectedBody:    "2606:2800:220:1:248:1893:25c8:1946",
+		},
+		{
+			name: "test DNS with type CNAME",
+			inputDNS: DNS{
+				QueryType: "CNAME",
+				QueryName: "doc.google.com.",
+			},
+			inputURL:        "8.8.8.8",
+			expectedDNSCode: "NOERROR",
+			expectedBody:    "writely.l.google.com.",
+		},
+		{
+			name: "test DNS with type MX",
+			inputDNS: DNS{
+				QueryType: "MX",
+				QueryName: "example.com.",
+			},
+			inputURL:        "8.8.8.8",
+			expectedDNSCode: "NOERROR",
+			expectedBody:    ".",
+		},
+		{
+			name: "test DNS with type NS",
+			inputDNS: DNS{
+				QueryType: "NS",
+				QueryName: "example.com.",
+			},
+			inputURL:        "8.8.8.8",
+			expectedDNSCode: "NOERROR",
+			expectedBody:    "*.iana-servers.net.",
+		},
+		{
+			name: "test DNS with fake type and retrieve error",
+			inputDNS: DNS{
+				QueryType: "B",
+				QueryName: "google",
+			},
+			inputURL:      "8.8.8.8",
+			isErrExpected: true,
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			dns := test.inputDNS
+			result := &Result{}
+			dns.query(test.inputURL, result)
+			if test.isErrExpected && len(result.Errors) == 0 {
+				t.Errorf("there should be errors")
+			}
+			if result.DNSRCode != test.expectedDNSCode {
+				t.Errorf("DNSRCodePlaceholder '%s' should have been %s", result.DNSRCode, test.expectedDNSCode)
+			}
+
+			if test.inputDNS.QueryType == "NS" {
+				// Because there are often multiple nameservers backing a single domain, we'll only look at the suffix
+				if !pattern.Match(test.expectedBody, string(result.Body)) {
+					t.Errorf("got %s, expected result %s,", string(result.Body), test.expectedBody)
+				}
+			} else {
+				if string(result.Body) != test.expectedBody {
+					t.Errorf("got %s, expected result %s,", string(result.Body), test.expectedBody)
+				}
+			}
+		})
+	}
+}
+
+func TestService_ValidateAndSetDefaultsWithNoDNSQueryName(t *testing.T) {
+	defer func() { recover() }()
+	dns := &DNS{
+		QueryType: "A",
+		QueryName: "",
+	}
+	dns.validateAndSetDefault()
+	t.Fatal("Should've panicked because service`s dns didn't have a query name, which is a mandatory field for dns")
+}
+
+func TestService_ValidateAndSetDefaultsWithInvalidDNSQueryType(t *testing.T) {
+	defer func() { recover() }()
+	dns := &DNS{
+		QueryType: "B",
+		QueryName: "example.com",
+	}
+	dns.validateAndSetDefault()
+	t.Fatal("Should've panicked because service`s dns query type is invalid, it needs to be a valid query name like A, AAAA, CNAME...")
+}

core/health-status.go

@@ -0,0 +1,11 @@
+package core
+
+// HealthStatus is the status of Gatus
+type HealthStatus struct {
+	// Status is the state of Gatus (UP/DOWN)
+	Status string `json:"status"`
+
+	// Message is an accompanying description of why the status is as reported.
+	// If the Status is UP, no message will be provided
+	Message string `json:"message,omitempty"`
+}

core/result.go

@@ -0,0 +1,44 @@
+package core
+
+import (
+	"time"
+)
+
+// Result of the evaluation of a Service
+type Result struct {
+	// HTTPStatus is the HTTP response status code
+	HTTPStatus int `json:"status"`
+
+	// DNSRCode is the response code of a DNS query in a human readable format
+	DNSRCode string `json:"-"`
+
+	// Body is the response body
+	Body []byte `json:"-"`
+
+	// Hostname extracted from the Service URL
+	Hostname string `json:"hostname"`
+
+	// IP resolved from the Service URL
+	IP string `json:"-"`
+
+	// Connected whether a connection to the host was established successfully
+	Connected bool `json:"-"`
+
+	// Duration time that the request took
+	Duration time.Duration `json:"duration"`
+
+	// Errors encountered during the evaluation of the service's health
+	Errors []string `json:"errors"`
+
+	// ConditionResults results of the service's conditions
+	ConditionResults []*ConditionResult `json:"condition-results"`
+
+	// Success whether the result signifies a success or not
+	Success bool `json:"success"`
+
+	// Timestamp when the request was sent
+	Timestamp time.Time `json:"timestamp"`
+
+	// CertificateExpiration is the duration before the certificate expires
+	CertificateExpiration time.Duration `json:"-"`
+}

core/service-status.go

@@ -0,0 +1,36 @@
+package core
+
+// ServiceStatus contains the evaluation Results of a Service
+type ServiceStatus struct {
+	// Name of the service
+	Name string `json:"name,omitempty"`
+
+	// Group the service is a part of. Used for grouping multiple services together on the front end.
+	Group string `json:"group,omitempty"`
+
+	// Results is the list of service evaluation results
+	Results []*Result `json:"results"`
+
+	// Uptime information on the service's uptime
+	Uptime *Uptime `json:"uptime"`
+}
+
+// NewServiceStatus creates a new ServiceStatus
+func NewServiceStatus(service *Service) *ServiceStatus {
+	return &ServiceStatus{
+		Name:    service.Name,
+		Group:   service.Group,
+		Results: make([]*Result, 0),
+		Uptime:  NewUptime(),
+	}
+}
+
+// AddResult adds a Result to ServiceStatus.Results and makes sure that there are
+// no more than 20 results in the Results slice
+func (ss *ServiceStatus) AddResult(result *Result) {
+	ss.Results = append(ss.Results, result)
+	if len(ss.Results) > 20 {
+		ss.Results = ss.Results[1:]
+	}
+	ss.Uptime.ProcessResult(result)
+}

core/service-status_test.go

@@ -0,0 +1,28 @@
+package core
+
+import (
+	"testing"
+	"time"
+)
+
+func TestNewServiceStatus(t *testing.T) {
+	service := &Service{Name: "name", Group: "group"}
+	serviceStatus := NewServiceStatus(service)
+	if serviceStatus.Name != service.Name {
+		t.Errorf("expected %s, got %s", service.Name, serviceStatus.Name)
+	}
+	if serviceStatus.Group != service.Group {
+		t.Errorf("expected %s, got %s", service.Group, serviceStatus.Group)
+	}
+}
+
+func TestServiceStatus_AddResult(t *testing.T) {
+	service := &Service{Name: "name", Group: "group"}
+	serviceStatus := NewServiceStatus(service)
+	for i := 0; i < 50; i++ {
+		serviceStatus.AddResult(&Result{Timestamp: time.Now()})
+	}
+	if len(serviceStatus.Results) != 20 {
+		t.Errorf("expected serviceStatus.Results to not exceed a length of 20")
+	}
+}

core/service.go

@@ -4,17 +4,39 @@ import (
 	"bytes"
 	"encoding/json"
 	"errors"
-	"github.com/TwinProduction/gatus/client"
 	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
+	"strings"
 	"time"
+
+	"github.com/TwinProduction/gatus/client"
+)
+
+const (
+	// HostHeader is the name of the header used to specify the host
+	HostHeader = "Host"
+
+	// ContentTypeHeader is the name of the header used to specify the content type
+	ContentTypeHeader = "Content-Type"
+
+	// UserAgentHeader is the name of the header used to specify the request's user agent
+	UserAgentHeader = "User-Agent"
+
+	// GatusUserAgent is the default user agent that Gatus uses to send requests.
+	GatusUserAgent = "Gatus/1.0"
 )
 
 var (
-	ErrNoCondition = errors.New("you must specify at least one condition per service")
-	ErrNoUrl       = errors.New("you must specify an url for each service")
+	// ErrServiceWithNoCondition is the error with which Gatus will panic if a service is configured with no conditions
+	ErrServiceWithNoCondition = errors.New("you must specify at least one condition per service")
+
+	// ErrServiceWithNoURL is the error with which Gatus will panic if a service is configured with no url
+	ErrServiceWithNoURL = errors.New("you must specify an url for each service")
+
+	// ErrServiceWithNoName is the error with which Gatus will panic if a service is configured with no name
+	ErrServiceWithNoName = errors.New("you must specify a name for each service")
 )
 
 // Service is the configuration of a monitored endpoint
@@ -22,8 +44,14 @@ type Service struct {
 	// Name of the service. Can be anything.
 	Name string `yaml:"name"`
 
+	// Group the service is a part of. Used for grouping multiple services together on the front end.
+	Group string `yaml:"group,omitempty"`
+
 	// URL to send the request to
-	Url string `yaml:"url"`
+	URL string `yaml:"url"`
+
+	// DNS is the configuration of DNS monitoring
+	DNS *DNS `yaml:"dns,omitempty"`
 
 	// Method of the request made to the url of the service
 	Method string `yaml:"method,omitempty"`
@@ -46,10 +74,18 @@ type Service struct {
 	// Alerts is the alerting configuration for the service in case of failure
 	Alerts []*Alert `yaml:"alerts"`
 
+	// Insecure is whether to skip verifying the server's certificate chain and host name
+	Insecure bool `yaml:"insecure,omitempty"`
+
+	// NumberOfFailuresInARow is the number of unsuccessful evaluations in a row
 	NumberOfFailuresInARow int
+
+	// NumberOfFailuresInARow is the number of successful evaluations in a row
+	NumberOfSuccessesInARow int
 }
 
-func (service *Service) Validate() {
+// ValidateAndSetDefaults validates the service's configuration and sets the default value of fields that have one
+func (service *Service) ValidateAndSetDefaults() {
 	// Set default values
 	if service.Interval == 0 {
 		service.Interval = 1 * time.Minute
@@ -60,28 +96,47 @@ func (service *Service) Validate() {
 	if len(service.Headers) == 0 {
 		service.Headers = make(map[string]string)
 	}
+	// Automatically add user agent header if there isn't one specified in the service configuration
+	if _, userAgentHeaderExists := service.Headers[UserAgentHeader]; !userAgentHeaderExists {
+		service.Headers[UserAgentHeader] = GatusUserAgent
+	}
+	// Automatically add "Content-Type: application/json" header if there's no Content-Type set
+	// and service.GraphQL is set to true
+	if _, contentTypeHeaderExists := service.Headers[ContentTypeHeader]; !contentTypeHeaderExists && service.GraphQL {
+		service.Headers[ContentTypeHeader] = "application/json"
+	}
 	for _, alert := range service.Alerts {
-		if alert.Threshold <= 0 {
-			alert.Threshold = 3
+		if alert.FailureThreshold <= 0 {
+			alert.FailureThreshold = 3
+		}
+		if alert.SuccessThreshold <= 0 {
+			alert.SuccessThreshold = 2
 		}
 	}
-	if len(service.Url) == 0 {
-		panic(ErrNoUrl)
+	if len(service.Name) == 0 {
+		panic(ErrServiceWithNoName)
+	}
+	if len(service.URL) == 0 {
+		panic(ErrServiceWithNoURL)
 	}
 	if len(service.Conditions) == 0 {
-		panic(ErrNoCondition)
+		panic(ErrServiceWithNoCondition)
+	}
+	if service.DNS != nil {
+		service.DNS.validateAndSetDefault()
+		return
 	}
-
 	// Make sure that the request can be created
-	_, err := http.NewRequest(service.Method, service.Url, bytes.NewBuffer([]byte(service.Body)))
+	_, err := http.NewRequest(service.Method, service.URL, bytes.NewBuffer([]byte(service.Body)))
 	if err != nil {
 		panic(err)
 	}
 }
 
-func (service *Service) EvaluateConditions() *Result {
+// EvaluateHealth sends a request to the service's URL and evaluates the conditions of the service.
+func (service *Service) EvaluateHealth() *Result {
 	result := &Result{Success: true, Errors: []string{}}
-	service.getIp(result)
+	service.getIP(result)
 	if len(result.Errors) == 0 {
 		service.call(result)
 	} else {
@@ -97,13 +152,14 @@ func (service *Service) EvaluateConditions() *Result {
 	return result
 }
 
+// GetAlertsTriggered returns a slice of alerts that have been triggered
 func (service *Service) GetAlertsTriggered() []Alert {
 	var alerts []Alert
 	if service.NumberOfFailuresInARow == 0 {
 		return alerts
 	}
 	for _, alert := range service.Alerts {
-		if alert.Enabled && alert.Threshold == service.NumberOfFailuresInARow {
+		if alert.Enabled && alert.FailureThreshold == service.NumberOfFailuresInARow {
 			alerts = append(alerts, *alert)
 			continue
 		}
@@ -111,39 +167,66 @@ func (service *Service) GetAlertsTriggered() []Alert {
 	return alerts
 }
 
-func (service *Service) getIp(result *Result) {
-	urlObject, err := url.Parse(service.Url)
+func (service *Service) getIP(result *Result) {
+	if service.DNS != nil {
+		result.Hostname = strings.TrimSuffix(service.URL, ":53")
+	} else {
+		urlObject, err := url.Parse(service.URL)
+		if err != nil {
+			result.Errors = append(result.Errors, err.Error())
+			return
+		}
+		result.Hostname = urlObject.Hostname()
+	}
+	ips, err := net.LookupIP(result.Hostname)
 	if err != nil {
 		result.Errors = append(result.Errors, err.Error())
 		return
 	}
-	result.Hostname = urlObject.Hostname()
-	ips, err := net.LookupIP(urlObject.Hostname())
-	if err != nil {
-		result.Errors = append(result.Errors, err.Error())
-		return
-	}
-	result.Ip = ips[0].String()
+	result.IP = ips[0].String()
 }
 
 func (service *Service) call(result *Result) {
-	request := service.buildRequest()
-	startTime := time.Now()
-	response, err := client.GetHttpClient().Do(request)
-	if err != nil {
-		result.Duration = time.Since(startTime)
-		result.Errors = append(result.Errors, err.Error())
-		return
+	var request *http.Request
+	var response *http.Response
+	var err error
+	isServiceDNS := service.DNS != nil
+	isServiceTCP := strings.HasPrefix(service.URL, "tcp://")
+	isServiceICMP := strings.HasPrefix(service.URL, "icmp://")
+	isServiceHTTP := !isServiceDNS && !isServiceTCP && !isServiceICMP
+	if isServiceHTTP {
+		request = service.buildHTTPRequest()
 	}
-	result.Duration = time.Since(startTime)
-	result.HttpStatus = response.StatusCode
-	result.Body, err = ioutil.ReadAll(response.Body)
-	if err != nil {
-		result.Errors = append(result.Errors, err.Error())
+	startTime := time.Now()
+	if isServiceDNS {
+		service.DNS.query(service.URL, result)
+		result.Duration = time.Since(startTime)
+	} else if isServiceTCP {
+		result.Connected = client.CanCreateTCPConnection(strings.TrimPrefix(service.URL, "tcp://"))
+		result.Duration = time.Since(startTime)
+	} else if isServiceICMP {
+		result.Connected, result.Duration = client.Ping(strings.TrimPrefix(service.URL, "icmp://"))
+	} else {
+		response, err = client.GetHTTPClient(service.Insecure).Do(request)
+		result.Duration = time.Since(startTime)
+		if err != nil {
+			result.Errors = append(result.Errors, err.Error())
+			return
+		}
+		if response.TLS != nil && len(response.TLS.PeerCertificates) > 0 {
+			certificate := response.TLS.PeerCertificates[0]
+			result.CertificateExpiration = certificate.NotAfter.Sub(time.Now())
+		}
+		result.HTTPStatus = response.StatusCode
+		result.Connected = response.StatusCode > 0
+		result.Body, err = ioutil.ReadAll(response.Body)
+		if err != nil {
+			result.Errors = append(result.Errors, err.Error())
+		}
 	}
 }
 
-func (service *Service) buildRequest() *http.Request {
+func (service *Service) buildHTTPRequest() *http.Request {
 	var bodyBuffer *bytes.Buffer
 	if service.GraphQL {
 		graphQlBody := map[string]string{
@@ -154,9 +237,12 @@ func (service *Service) buildRequest() *http.Request {
 	} else {
 		bodyBuffer = bytes.NewBuffer([]byte(service.Body))
 	}
-	request, _ := http.NewRequest(service.Method, service.Url, bodyBuffer)
+	request, _ := http.NewRequest(service.Method, service.URL, bodyBuffer)
 	for k, v := range service.Headers {
 		request.Header.Set(k, v)
+		if k == HostHeader {
+			request.Host = v
+		}
 	}
 	return request
 }

core/service_test.go

@@ -1,37 +1,306 @@
 package core
 
 import (
+	"io/ioutil"
+	"strings"
 	"testing"
+	"time"
 )
 
-func TestIntegrationEvaluateConditions(t *testing.T) {
+func TestService_ValidateAndSetDefaults(t *testing.T) {
 	condition := Condition("[STATUS] == 200")
 	service := Service{
 		Name:       "TwiNNatioN",
-		Url:        "https://twinnation.org/health",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+		Alerts:     []*Alert{{Type: PagerDutyAlert}},
+	}
+	service.ValidateAndSetDefaults()
+	if service.Method != "GET" {
+		t.Error("Service method should've defaulted to GET")
+	}
+	if service.Interval != time.Minute {
+		t.Error("Service interval should've defaulted to 1 minute")
+	}
+	if service.Headers == nil {
+		t.Error("Service headers should've defaulted to an empty map")
+	}
+	if len(service.Alerts) != 1 {
+		t.Error("Service should've had 1 alert")
+	}
+	if service.Alerts[0].Enabled {
+		t.Error("Service alert should've defaulted to disabled")
+	}
+	if service.Alerts[0].SuccessThreshold != 2 {
+		t.Error("Service alert should've defaulted to a success threshold of 2")
+	}
+	if service.Alerts[0].FailureThreshold != 3 {
+		t.Error("Service alert should've defaulted to a failure threshold of 3")
+	}
+}
+
+func TestService_ValidateAndSetDefaultsWithNoName(t *testing.T) {
+	defer func() { recover() }()
+	condition := Condition("[STATUS] == 200")
+	service := &Service{
+		Name:       "",
+		URL:        "http://example.com",
 		Conditions: []*Condition{&condition},
 	}
-	result := service.EvaluateConditions()
+	service.ValidateAndSetDefaults()
+	t.Fatal("Should've panicked because service didn't have a name, which is a mandatory field")
+}
+
+func TestService_ValidateAndSetDefaultsWithNoUrl(t *testing.T) {
+	defer func() { recover() }()
+	condition := Condition("[STATUS] == 200")
+	service := &Service{
+		Name:       "example",
+		URL:        "",
+		Conditions: []*Condition{&condition},
+	}
+	service.ValidateAndSetDefaults()
+	t.Fatal("Should've panicked because service didn't have an url, which is a mandatory field")
+}
+
+func TestService_ValidateAndSetDefaultsWithNoConditions(t *testing.T) {
+	defer func() { recover() }()
+	service := &Service{
+		Name:       "example",
+		URL:        "http://example.com",
+		Conditions: nil,
+	}
+	service.ValidateAndSetDefaults()
+	t.Fatal("Should've panicked because service didn't have at least 1 condition")
+}
+
+func TestService_ValidateAndSetDefaultsWithDNS(t *testing.T) {
+	conditionSuccess := Condition("[DNS_RCODE] == NOERROR")
+	service := &Service{
+		Name: "dns-test",
+		URL:  "http://example.com",
+		DNS: &DNS{
+			QueryType: "A",
+			QueryName: "example.com",
+		},
+		Conditions: []*Condition{&conditionSuccess},
+	}
+	service.ValidateAndSetDefaults()
+	if service.DNS.QueryName != "example.com." {
+		t.Error("Service.dns.query-name should be formatted with . suffix")
+	}
+}
+
+func TestService_GetAlertsTriggered(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+		Alerts:     []*Alert{{Type: PagerDutyAlert, Enabled: true}},
+	}
+	service.ValidateAndSetDefaults()
+	if service.NumberOfFailuresInARow != 0 {
+		t.Error("Service.NumberOfFailuresInARow should start with 0")
+	}
+	if service.NumberOfSuccessesInARow != 0 {
+		t.Error("Service.NumberOfSuccessesInARow should start with 0")
+	}
+	if len(service.GetAlertsTriggered()) > 0 {
+		t.Error("No alerts should've been triggered, because service.NumberOfFailuresInARow is 0, which is below the failure threshold")
+	}
+	service.NumberOfFailuresInARow = service.Alerts[0].FailureThreshold
+	if len(service.GetAlertsTriggered()) != 1 {
+		t.Error("Alert should've been triggered")
+	}
+}
+
+func TestService_buildHTTPRequest(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+	}
+	service.ValidateAndSetDefaults()
+	request := service.buildHTTPRequest()
+	if request.Method != "GET" {
+		t.Error("request.Method should've been GET, but was", request.Method)
+	}
+	if request.Host != "twinnation.org" {
+		t.Error("request.Host should've been twinnation.org, but was", request.Host)
+	}
+	if userAgent := request.Header.Get("User-Agent"); userAgent != GatusUserAgent {
+		t.Errorf("request.Header.Get(User-Agent) should've been %s, but was %s", GatusUserAgent, userAgent)
+	}
+}
+
+func TestService_buildHTTPRequestWithCustomUserAgent(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+		Headers: map[string]string{
+			"User-Agent": "Test/2.0",
+		},
+	}
+	service.ValidateAndSetDefaults()
+	request := service.buildHTTPRequest()
+	if request.Method != "GET" {
+		t.Error("request.Method should've been GET, but was", request.Method)
+	}
+	if request.Host != "twinnation.org" {
+		t.Error("request.Host should've been twinnation.org, but was", request.Host)
+	}
+	if userAgent := request.Header.Get("User-Agent"); userAgent != "Test/2.0" {
+		t.Errorf("request.Header.Get(User-Agent) should've been %s, but was %s", "Test/2.0", userAgent)
+	}
+}
+
+func TestService_buildHTTPRequestWithHostHeader(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Method:     "POST",
+		Conditions: []*Condition{&condition},
+		Headers: map[string]string{
+			"Host": "example.com",
+		},
+	}
+	service.ValidateAndSetDefaults()
+	request := service.buildHTTPRequest()
+	if request.Method != "POST" {
+		t.Error("request.Method should've been POST, but was", request.Method)
+	}
+	if request.Host != "example.com" {
+		t.Error("request.Host should've been example.com, but was", request.Host)
+	}
+}
+
+func TestService_buildHTTPRequestWithGraphQLEnabled(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/graphql",
+		Method:     "POST",
+		Conditions: []*Condition{&condition},
+		GraphQL:    true,
+		Body: `{
+  user(gender: "female") {
+    id
+    name
+    gender
+    avatar
+  }
+}`,
+	}
+	service.ValidateAndSetDefaults()
+	request := service.buildHTTPRequest()
+	if request.Method != "POST" {
+		t.Error("request.Method should've been POST, but was", request.Method)
+	}
+	if contentType := request.Header.Get(ContentTypeHeader); contentType != "application/json" {
+		t.Error("request.Header.Content-Type should've been application/json, but was", contentType)
+	}
+	body, _ := ioutil.ReadAll(request.Body)
+	if !strings.HasPrefix(string(body), "{\"query\":") {
+		t.Error("request.Body should've started with '{\"query\":', but it didn't:", string(body))
+	}
+}
+
+func TestIntegrationEvaluateHealth(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+	}
+	result := service.EvaluateHealth()
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
 	if !result.Success {
 		t.Error("Because all conditions passed, this should have been a success")
 	}
 }
 
-func TestIntegrationEvaluateConditionsWithFailure(t *testing.T) {
+func TestIntegrationEvaluateHealthWithFailure(t *testing.T) {
 	condition := Condition("[STATUS] == 500")
 	service := Service{
 		Name:       "TwiNNatioN",
-		Url:        "https://twinnation.org/health",
+		URL:        "https://twinnation.org/health",
 		Conditions: []*Condition{&condition},
 	}
-	result := service.EvaluateConditions()
+	result := service.EvaluateHealth()
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
 	if result.Success {
 		t.Error("Because one of the conditions failed, success should have been false")
 	}
 }
+
+func TestIntegrationEvaluateHealthForDNS(t *testing.T) {
+	conditionSuccess := Condition("[DNS_RCODE] == NOERROR")
+	conditionBody := Condition("[BODY] == 93.184.216.34")
+	service := Service{
+		Name: "TwiNNatioN",
+		URL:  "8.8.8.8",
+		DNS: &DNS{
+			QueryType: "A",
+			QueryName: "example.com.",
+		},
+		Conditions: []*Condition{&conditionSuccess, &conditionBody},
+	}
+	result := service.EvaluateHealth()
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Conditions '%s' and %s should have been a success", conditionSuccess, conditionBody)
+	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
+	if !result.Success {
+		t.Error("Because all conditions passed, this should have been a success")
+	}
+}
+
+func TestIntegrationEvaluateHealthForICMP(t *testing.T) {
+	conditionSuccess := Condition("[CONNECTED] == true")
+	service := Service{
+		Name:       "ICMP test",
+		URL:        "icmp://127.0.0.1",
+		Conditions: []*Condition{&conditionSuccess},
+	}
+	result := service.EvaluateHealth()
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Conditions '%s' should have been a success", conditionSuccess)
+	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
+	if !result.Success {
+		t.Error("Because all conditions passed, this should have been a success")
+	}
+}
+
+func TestService_getIP(t *testing.T) {
+	conditionSuccess := Condition("[CONNECTED] == true")
+	service := Service{
+		Name:       "Invalid URL test",
+		URL:        "",
+		Conditions: []*Condition{&conditionSuccess},
+	}
+	result := &Result{}
+	service.getIP(result)
+	if len(result.Errors) == 0 {
+		t.Error("service.getIP(result) should've thrown an error because the URL is invalid, thus cannot be parsed")
+	}
+}

core/types.go

@@ -1,27 +0,0 @@
-package core
-
-import (
-	"time"
-)
-
-type HealthStatus struct {
-	Status  string `json:"status"`
-	Message string `json:"message,omitempty"`
-}
-
-type Result struct {
-	HttpStatus       int                `json:"status"`
-	Body             []byte             `json:"-"`
-	Hostname         string             `json:"hostname"`
-	Ip               string             `json:"-"`
-	Duration         time.Duration      `json:"duration"`
-	Errors           []string           `json:"errors"`
-	ConditionResults []*ConditionResult `json:"condition-results"`
-	Success          bool               `json:"success"`
-	Timestamp        time.Time          `json:"timestamp"`
-}
-
-type ConditionResult struct {
-	Condition string `json:"condition"`
-	Success   bool   `json:"success"`
-}

core/uptime.go

@@ -0,0 +1,114 @@
+package core
+
+import (
+	"log"
+	"time"
+)
+
+const (
+	// RFC3339WithoutMinutesAndSeconds is the format defined by RFC3339 (see time.RFC3339) but with the minutes
+	// and seconds hardcoded to 0.
+	RFC3339WithoutMinutesAndSeconds = "2006-01-02T15:00:00Z07:00"
+
+	numberOfHoursInTenDays = 10 * 24
+	sevenDays              = 7 * 24 * time.Hour
+)
+
+// Uptime is the struct that contains the relevant data for calculating the uptime as well as the uptime itself
+type Uptime struct {
+	// LastSevenDays is the uptime percentage over the past 7 days
+	LastSevenDays float64 `json:"7d"`
+
+	// LastTwentyFourHours is the uptime percentage over the past 24 hours
+	LastTwentyFourHours float64 `json:"24h"`
+
+	// LastHour is the uptime percentage over the past hour
+	LastHour float64 `json:"1h"`
+
+	successCountPerHour map[string]uint64
+	totalCountPerHour   map[string]uint64
+}
+
+// NewUptime creates a new Uptime
+func NewUptime() *Uptime {
+	return &Uptime{
+		successCountPerHour: make(map[string]uint64),
+		totalCountPerHour:   make(map[string]uint64),
+	}
+}
+
+// ProcessResult processes the result by extracting the relevant from the result and recalculating the uptime
+// if necessary
+func (uptime *Uptime) ProcessResult(result *Result) {
+	timestampDateWithHour := result.Timestamp.Format(RFC3339WithoutMinutesAndSeconds)
+	if result.Success {
+		uptime.successCountPerHour[timestampDateWithHour]++
+	}
+	uptime.totalCountPerHour[timestampDateWithHour]++
+	// Clean up only when we're starting to have too many useless keys
+	// Note that this is only triggered when there are more entries than there should be after
+	// 10 days, despite the fact that we are deleting everything that's older than 7 days.
+	// This is to prevent re-iterating on every `ProcessResult` as soon as the uptime has been logged for 7 days.
+	if len(uptime.totalCountPerHour) > numberOfHoursInTenDays {
+		sevenDaysAgo := time.Now().Add(-(sevenDays + time.Hour))
+		for k := range uptime.totalCountPerHour {
+			dateWithHour, err := time.Parse(time.RFC3339, k)
+			if err != nil {
+				// This shouldn't happen, but we'll log it in case it does happen
+				log.Println("[uptime][ProcessResult] Failed to parse programmatically generated timestamp:", err.Error())
+				continue
+			}
+			if sevenDaysAgo.Unix() > dateWithHour.Unix() {
+				delete(uptime.totalCountPerHour, k)
+				delete(uptime.successCountPerHour, k)
+			}
+		}
+	}
+	if result.Success {
+		// Recalculate uptime if at least one of the 1h, 24h or 7d uptime are not 100%
+		// If they're all 100%, then recalculating the uptime would be useless unless
+		// the result added was a failure (!result.Success)
+		if uptime.LastSevenDays != 1 || uptime.LastTwentyFourHours != 1 || uptime.LastHour != 1 {
+			uptime.recalculate()
+		}
+	} else {
+		// Recalculate uptime if at least one of the 1h, 24h or 7d uptime are not 0%
+		// If they're all 0%, then recalculating the uptime would be useless unless
+		// the result added was a success (result.Success)
+		if uptime.LastSevenDays != 0 || uptime.LastTwentyFourHours != 0 || uptime.LastHour != 0 {
+			uptime.recalculate()
+		}
+	}
+}
+
+func (uptime *Uptime) recalculate() {
+	uptimeBrackets := make(map[string]uint64)
+	now := time.Now()
+	// The oldest uptime bracket starts 7 days ago, so we'll start from there
+	timestamp := now.Add(-sevenDays)
+	for now.Sub(timestamp) >= 0 {
+		timestampDateWithHour := timestamp.Format(RFC3339WithoutMinutesAndSeconds)
+		successCountForTimestamp := uptime.successCountPerHour[timestampDateWithHour]
+		totalCountForTimestamp := uptime.totalCountPerHour[timestampDateWithHour]
+		uptimeBrackets["7d_success"] += successCountForTimestamp
+		uptimeBrackets["7d_total"] += totalCountForTimestamp
+		if now.Sub(timestamp) <= 24*time.Hour {
+			uptimeBrackets["24h_success"] += successCountForTimestamp
+			uptimeBrackets["24h_total"] += totalCountForTimestamp
+		}
+		if now.Sub(timestamp) <= time.Hour {
+			uptimeBrackets["1h_success"] += successCountForTimestamp
+			uptimeBrackets["1h_total"] += totalCountForTimestamp
+		}
+		timestamp = timestamp.Add(time.Hour)
+	}
+	if uptimeBrackets["7d_total"] > 0 {
+		uptime.LastSevenDays = float64(uptimeBrackets["7d_success"]) / float64(uptimeBrackets["7d_total"])
+	}
+	if uptimeBrackets["24h_total"] > 0 {
+		uptime.LastTwentyFourHours = float64(uptimeBrackets["24h_success"]) / float64(uptimeBrackets["24h_total"])
+	}
+	if uptimeBrackets["1h_total"] > 0 {
+		uptime.LastHour = float64(uptimeBrackets["1h_success"]) / float64(uptimeBrackets["1h_total"])
+	}
+}

core/uptime_test.go

@@ -0,0 +1,79 @@
+package core
+
+import (
+	"testing"
+	"time"
+)
+
+func TestUptime_ProcessResult(t *testing.T) {
+	service := &Service{Name: "name", Group: "group"}
+	serviceStatus := NewServiceStatus(service)
+	uptime := serviceStatus.Uptime
+
+	checkUptimes(t, serviceStatus, 0.00, 0.00, 0.00)
+
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-7 * 24 * time.Hour), Success: true})
+	checkUptimes(t, serviceStatus, 1.00, 0.00, 0.00)
+
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-6 * 24 * time.Hour), Success: false})
+	checkUptimes(t, serviceStatus, 0.50, 0.00, 0.00)
+
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-8 * 24 * time.Hour), Success: true})
+	checkUptimes(t, serviceStatus, 0.50, 0.00, 0.00)
+
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-24 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-12 * time.Hour), Success: true})
+	checkUptimes(t, serviceStatus, 0.75, 1.00, 0.00)
+
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-1 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-30 * time.Minute), Success: false})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-15 * time.Minute), Success: false})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-10 * time.Minute), Success: false})
+	checkUptimes(t, serviceStatus, 0.50, 0.50, 0.25)
+
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-120 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-119 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-118 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-117 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-10 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-8 * time.Hour), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-30 * time.Minute), Success: true})
+	uptime.ProcessResult(&Result{Timestamp: time.Now().Add(-25 * time.Minute), Success: true})
+	checkUptimes(t, serviceStatus, 0.75, 0.70, 0.50)
+}
+
+func TestServiceStatus_AddResultUptimeIsCleaningUpAfterItself(t *testing.T) {
+	service := &Service{Name: "name", Group: "group"}
+	serviceStatus := NewServiceStatus(service)
+	now := time.Now()
+	now = time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 0, 0, 0, now.Location())
+	// Start 12 days ago
+	timestamp := now.Add(-12 * 24 * time.Hour)
+	for timestamp.Unix() <= now.Unix() {
+		serviceStatus.AddResult(&Result{Timestamp: timestamp, Success: true})
+		if len(serviceStatus.Uptime.successCountPerHour) > numberOfHoursInTenDays {
+			t.Errorf("At no point in time should there be more than %d entries in serviceStatus.successCountPerHour", numberOfHoursInTenDays)
+		}
+		//fmt.Printf("timestamp=%s; uptimeDuringLastHour=%f; timeAgo=%s\n", timestamp.Format(time.RFC3339), serviceStatus.UptimeDuringLastHour, time.Since(timestamp))
+		if now.Sub(timestamp) > time.Hour && serviceStatus.Uptime.LastHour != 0 {
+			t.Error("most recent timestamp > 1h ago, expected serviceStatus.Uptime.LastHour to be 0, got", serviceStatus.Uptime.LastHour)
+		}
+		if now.Sub(timestamp) < time.Hour && serviceStatus.Uptime.LastHour == 0 {
+			t.Error("most recent timestamp < 1h ago, expected serviceStatus.Uptime.LastHour to NOT be 0, got", serviceStatus.Uptime.LastHour)
+		}
+		// Simulate service with an interval of 1 minute
+		timestamp = timestamp.Add(3 * time.Minute)
+	}
+}
+
+func checkUptimes(t *testing.T, status *ServiceStatus, expectedUptimeDuringLastSevenDays, expectedUptimeDuringLastTwentyFourHours, expectedUptimeDuringLastHour float64) {
+	if status.Uptime.LastSevenDays != expectedUptimeDuringLastSevenDays {
+		t.Errorf("expected status.Uptime.LastSevenDays to be %f, got %f", expectedUptimeDuringLastHour, status.Uptime.LastSevenDays)
+	}
+	if status.Uptime.LastTwentyFourHours != expectedUptimeDuringLastTwentyFourHours {
+		t.Errorf("expected status.Uptime.LastTwentyFourHours to be %f, got %f", expectedUptimeDuringLastTwentyFourHours, status.Uptime.LastTwentyFourHours)
+	}
+	if status.Uptime.LastHour != expectedUptimeDuringLastHour {
+		t.Errorf("expected status.Uptime.LastHour to be %f, got %f", expectedUptimeDuringLastHour, status.Uptime.LastHour)
+	}
+}

core/util.go

@@ -1,74 +0,0 @@
-package core
-
-import (
-	"fmt"
-	"github.com/TwinProduction/gatus/jsonpath"
-	"strconv"
-	"strings"
-)
-
-const (
-	StatusPlaceholder       = "[STATUS]"
-	IPPlaceHolder           = "[IP]"
-	ResponseTimePlaceHolder = "[RESPONSE_TIME]"
-	BodyPlaceHolder         = "[BODY]"
-
-	LengthFunctionPrefix = "len("
-	FunctionSuffix       = ")"
-
-	InvalidConditionElementSuffix = "(INVALID)"
-)
-
-func sanitizeAndResolve(list []string, result *Result) []string {
-	var sanitizedList []string
-	body := strings.TrimSpace(string(result.Body))
-	for _, element := range list {
-		element = strings.TrimSpace(element)
-		switch strings.ToUpper(element) {
-		case StatusPlaceholder:
-			element = strconv.Itoa(result.HttpStatus)
-		case IPPlaceHolder:
-			element = result.Ip
-		case ResponseTimePlaceHolder:
-			element = strconv.Itoa(int(result.Duration.Milliseconds()))
-		case BodyPlaceHolder:
-			element = body
-		default:
-			// if starts with BodyPlaceHolder, then evaluate json path
-			if strings.Contains(element, BodyPlaceHolder) {
-				wantLength := false
-				if strings.HasPrefix(element, LengthFunctionPrefix) && strings.HasSuffix(element, FunctionSuffix) {
-					wantLength = true
-					element = strings.TrimSuffix(strings.TrimPrefix(element, LengthFunctionPrefix), FunctionSuffix)
-				}
-				resolvedElement, resolvedElementLength, err := jsonpath.Eval(strings.Replace(element, fmt.Sprintf("%s.", BodyPlaceHolder), "", 1), result.Body)
-				if err != nil {
-					result.Errors = append(result.Errors, err.Error())
-					element = fmt.Sprintf("%s %s", element, InvalidConditionElementSuffix)
-				} else {
-					if wantLength {
-						element = fmt.Sprintf("%d", resolvedElementLength)
-					} else {
-						element = resolvedElement
-					}
-				}
-			}
-		}
-		sanitizedList = append(sanitizedList, element)
-	}
-	return sanitizedList
-}
-
-func sanitizeAndResolveNumerical(list []string, result *Result) []int {
-	var sanitizedNumbers []int
-	sanitizedList := sanitizeAndResolve(list, result)
-	for _, element := range sanitizedList {
-		if number, err := strconv.Atoi(element); err != nil {
-			// Default to 0 if the string couldn't be converted to an integer
-			sanitizedNumbers = append(sanitizedNumbers, 0)
-		} else {
-			sanitizedNumbers = append(sanitizedNumbers, number)
-		}
-	}
-	return sanitizedNumbers
-}

docs/pagerduty-integration-guide.md

@@ -0,0 +1,74 @@
+# PagerDuty + Gatus Integration Benefits
+- Notify on-call responders based on alerts sent from Gatus.
+- Incidents will automatically resolve in PagerDuty when the service that caused the incident in Gatus returns to a healthy state.
+
+
+# How it Works
+- Services that do not meet the user-specified conditions and that are configured with alerts of type `pagerduty` will trigger a new incident on the corresponding PagerDuty service when the alert's defined `failure-threshold` has been reached.
+- Once the unhealthy services have returned to a healthy state for the number of executions defined in `success-threshold`, the previously triggered incident will be automatically resolved.
+
+
+# Requirements
+- PagerDuty integrations require an Admin base role for account authorization. If you do not have this role, please reach out to an Admin or Account Owner within your organization to configure the integration.
+
+
+# Support
+If you need help with this integration, please create an issue at https://github.com/TwinProduction/gatus/issues
+
+
+# Integration Walkthrough
+## In PagerDuty
+### Integrating With a PagerDuty Service
+1. From the **Configuration** menu, select **Services**.
+2. There are two ways to add an integration to a service:
+   * **If you are adding your integration to an existing service**: Click the **name** of the service you want to add the integration to. Then, select the **Integrations** tab and click the **New Integration** button.
+   * **If you are creating a new service for your integration**: Please read our documentation in section [Configuring Services and Integrations](https://support.pagerduty.com/docs/services-and-integrations#section-configuring-services-and-integrations) and follow the steps outlined in the [Create a New Service](https://support.pagerduty.com/docs/services-and-integrations#section-create-a-new-service) section, selecting **Gatus** as the **Integration Type** in step 4. Continue with the In Gatus section (below) once you have finished these steps.
+3. Enter an **Integration Name** in the format `gatus-service-name` (e.g. `Gatus-Shopping-Cart`) and select **Gatus** from the Integration Type menu.
+4. Click the **Add Integration** button to save your new integration. You will be redirected to the Integrations tab for your service.
+5. An **Integration Key** will be generated on this screen. Keep this key saved in a safe place, as it will be used when you configure the integration with **Gatus** in the next section.
+![PagerDuty Integration Key](https://raw.githubusercontent.com/TwinProduction/gatus/master/.github/assets/pagerduty-integration-key.png)
+
+
+## In Gatus
+In your configuration file, you must first specify the integration key at `alerting.pagerduty.integration-key`, like so:
+```yaml
+alerting:
+  pagerduty: 
+    integration-key: "********************************"
+```
+You can now add alerts of type `pagerduty` in the services you've defined, like so:
+```yaml
+services:
+  - name: twinnation
+    interval: 30s
+    url: "https://twinnation.org/health"
+    alerts:
+      - type: pagerduty
+        enabled: true
+        failure-threshold: 3
+        success-threshold: 5
+        description: "healthcheck failed 3 times in a row"
+        send-on-resolved: true
+    conditions:
+      - "[STATUS] == 200"
+      - "[BODY].status == UP"
+      - "[RESPONSE_TIME] < 300"
+```
+
+The sample above will do the following:
+- Send a request to the `https://twinnation.org/health` (`services[].url`) specified every **30s** (`services[].interval`)
+- Evaluate the conditions to determine whether the service is "healthy" or not
+- **If all conditions are not met 3 (`services[].alerts[].failure-threshold`) times in a row**: Gatus will create a new incident
+- **If, after an incident has been triggered, all conditions are met 5 (`services[].alerts[].success-threshold`) times in a row _AND_ `services[].alerts[].send-on-resolved` is set to `true`**: Gatus will resolve the triggered incident
+
+It is highly recommended to set `services[].alerts[].send-on-resolved` to true for alerts of type `pagerduty`.
+
+
+# How to Uninstall
+1. Navigate to the PagerDuty service you'd like to uninstall the Gatus integration from
+2. Click on the **Integration** tab
+3. Click on the **Gatus** integration
+4. Click on **Delete Integration**
+
+While the above will prevent incidents from being created, you are also highly encouraged to disable the alerts
+in your Gatus configuration files or simply remove the integration key from the configuration file.

example/docker-compose-mattermost/config.yaml

@@ -0,0 +1,6 @@
+services:
+  - name: example
+    url: http://example.org
+    interval: 30s
+    conditions:
+      - "[STATUS] == 200"

example/docker-compose-mattermost/docker-compose.yml

@@ -0,0 +1,13 @@
+version: "3.8"
+services:
+    gatus:
+        image: twinproduction/gatus:latest
+        ports:
+          - 8080:8080
+        volumes:
+          - ./config.yaml:/config/config.yaml
+
+    mattermost-preview:
+        image: mattermost/mattermost-preview:latest
+        ports:
+          - 8065:8065

example/kubernetes-with-auto-discovery/gatus.yaml

@@ -0,0 +1,109 @@
+apiVersion: v1
+data:
+  config.yaml: |
+    kubernetes:
+      cluster-mode: "in"
+      auto-discover: true
+      excluded-service-suffixes:
+        - canary
+      service-template:
+        interval: 30s
+        conditions:
+          - "[STATUS] == 200"
+      namespaces:
+        - name: default
+          hostname-suffix: ".default.svc.cluster.local"
+          target-path: "/health"
+          excluded-services:
+            - gatus
+kind: ConfigMap
+metadata:
+  name: gatus
+  namespace: kube-system
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: gatus
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - services
+    verbs:
+      - list
+      - get
+---
+apiVersion: v1
+automountServiceAccountToken: true
+kind: ServiceAccount
+metadata:
+  name: gatus
+  namespace: kube-system
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: gatus
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: gatus
+subjects:
+  - kind: ServiceAccount
+    name: gatus
+    namespace: kube-system
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: gatus
+  namespace: kube-system
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      k8s-app: gatus
+  template:
+    metadata:
+      labels:
+        k8s-app: gatus
+      name: gatus
+      namespace: kube-system
+    spec:
+      containers:
+        - image: twinproduction/gatus
+          imagePullPolicy: IfNotPresent
+          name: gatus
+          ports:
+            - containerPort: 8080
+              name: http
+              protocol: TCP
+          resources:
+            limits:
+              cpu: 200m
+              memory: 50M
+            requests:
+              cpu: 50m
+              memory: 20M
+          volumeMounts:
+            - mountPath: /config
+              name: gatus-config
+      volumes:
+        - configMap:
+            name: gatus
+          name: gatus-config
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: gatus
+  namespace: kube-system
+spec:
+  ports:
+    - name: http
+      port: 8080
+      protocol: TCP
+      targetPort: 8080
+  selector:
+    k8s-app: gatus

example/kubernetes/gatus.yaml

@@ -13,6 +13,16 @@ data:
         interval: 5m
         conditions:
           - "[STATUS] == 200"
+      - name: cat-fact
+        url: "https://cat-fact.herokuapp.com/facts/random"
+        interval: 5m
+        conditions:
+          - "[STATUS] == 200"
+          - "[BODY].deleted == false"
+          - "len([BODY].text) > 0"
+          - "[BODY].text == pat(*cat*)"
+          - "[STATUS] == pat(2*)"
+          - "[CONNECTED] == true"
       - name: Example
         url: https://example.com/
         conditions:
@@ -49,10 +59,10 @@ spec:
               protocol: TCP
           resources:
             limits:
-              cpu: 50m
+              cpu: 200m
               memory: 50M
             requests:
-              cpu: 20m
+              cpu: 50m
               memory: 20M
           volumeMounts:
             - mountPath: /config

go.mod

@@ -3,6 +3,23 @@ module github.com/TwinProduction/gatus
 go 1.15
 
 require (
-	github.com/prometheus/client_golang v1.2.1
-	gopkg.in/yaml.v2 v2.2.2
+	cloud.google.com/go v0.74.0 // indirect
+	github.com/TwinProduction/gocache v1.1.0
+	github.com/go-ping/ping v0.0.0-20201115131931-3300c582a663
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/gorilla/mux v1.8.0
+	github.com/imdario/mergo v0.3.11 // indirect
+	github.com/miekg/dns v1.1.35
+	github.com/prometheus/client_golang v1.9.0
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
+	golang.org/x/net v0.0.0-20201224014010-6772e930b67b // indirect
+	golang.org/x/sys v0.0.0-20201223074533-0d417f636930 // indirect
+	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf // indirect
+	golang.org/x/time v0.0.0-20201208040808-7e3f01d25324 // indirect
+	gopkg.in/yaml.v2 v2.4.0
+	k8s.io/api v0.18.14
+	k8s.io/apimachinery v0.18.14
+	k8s.io/client-go v0.18.14
 )
+
+replace k8s.io/client-go => k8s.io/client-go v0.18.14

go.sum

@@ -1,79 +1,852 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
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+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
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k8s/client.go

@@ -0,0 +1,86 @@
+package k8s
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/TwinProduction/gatus/k8stest"
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+// KubernetesClientApi is a minimal interface for interacting with Kubernetes
+// Created mostly to make mocking the Kubernetes client easier
+type KubernetesClientApi interface {
+	GetServices(namespace string) ([]v1.Service, error)
+}
+
+// KubernetesClient is a working implementation of KubernetesClientApi
+type KubernetesClient struct {
+	client *kubernetes.Clientset
+}
+
+// GetServices returns a list of services for a given namespace
+func (k *KubernetesClient) GetServices(namespace string) ([]v1.Service, error) {
+	services, err := k.client.CoreV1().Services(namespace).List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	return services.Items, nil
+}
+
+// NewKubernetesClient creates a KubernetesClient
+func NewKubernetesClient(client *kubernetes.Clientset) *KubernetesClient {
+	return &KubernetesClient{
+		client: client,
+	}
+}
+
+// NewClient creates a Kubernetes client for the given ClusterMode
+func NewClient(clusterMode ClusterMode) (KubernetesClientApi, error) {
+	var kubeConfig *rest.Config
+	var err error
+	switch clusterMode {
+	case ClusterModeIn:
+		kubeConfig, err = rest.InClusterConfig()
+	case ClusterModeOut:
+		kubeConfig, err = getOutClusterConfig()
+	case ClusterModeMock:
+		return k8stest.GetMockedKubernetesClient(), nil
+	default:
+		return nil, fmt.Errorf("invalid cluster mode, try '%s' or '%s'", ClusterModeIn, ClusterModeOut)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("unable to get cluster config for mode '%s': %s", clusterMode, err.Error())
+	}
+	client, err := kubernetes.NewForConfig(kubeConfig)
+	if err != nil {
+		return nil, err
+	}
+	return NewKubernetesClient(client), nil
+}
+
+func homeDir() string {
+	if h := os.Getenv("HOME"); h != "" {
+		return h
+	}
+	return os.Getenv("USERPROFILE") // windows
+}
+
+func getOutClusterConfig() (*rest.Config, error) {
+	var kubeConfig *string
+	if home := homeDir(); home != "" {
+		kubeConfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
+	} else {
+		kubeConfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
+	}
+	flag.Parse()
+	return clientcmd.BuildConfigFromFlags("", *kubeConfig)
+}

k8s/config.go

@@ -0,0 +1,45 @@
+package k8s
+
+import "github.com/TwinProduction/gatus/core"
+
+// Config for Kubernetes auto-discovery
+type Config struct {
+	// AutoDiscover to discover services to monitor
+	AutoDiscover bool `yaml:"auto-discover"`
+
+	// ClusterMode is the mode to use to authenticate with Kubernetes
+	ClusterMode ClusterMode `yaml:"cluster-mode"`
+
+	// ServiceTemplate is the template for auto discovered services
+	ServiceTemplate *core.Service `yaml:"service-template"`
+
+	// ExcludedServiceSuffixes is a list of service suffixes that should be ignored
+	ExcludedServiceSuffixes []string `yaml:"excluded-service-suffixes"`
+
+	// Namespaces is a list of configurations for the namespaces from which services will be discovered
+	Namespaces []*NamespaceConfig `yaml:"namespaces"`
+}
+
+// NamespaceConfig level config
+type NamespaceConfig struct {
+	// Name of the namespace
+	Name string `yaml:"name"`
+
+	// ExcludedServices is a list of services to exclude from the auto discovery
+	ExcludedServices []string `yaml:"excluded-services"`
+
+	// HostnameSuffix is a suffix to append to each service name before calling TargetPath
+	HostnameSuffix string `yaml:"hostname-suffix"`
+
+	// TargetPath Path to append after the HostnameSuffix
+	TargetPath string `yaml:"target-path"`
+}
+
+// ClusterMode is the mode to use to authenticate to Kubernetes
+type ClusterMode string
+
+const (
+	ClusterModeIn   ClusterMode = "in"
+	ClusterModeOut  ClusterMode = "out"
+	ClusterModeMock ClusterMode = "mock"
+)

k8s/discovery.go

@@ -0,0 +1,54 @@
+package k8s
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+// DiscoverServices return discovered services
+func DiscoverServices(kubernetesConfig *Config) ([]*core.Service, error) {
+	client, err := NewClient(kubernetesConfig.ClusterMode)
+	if err != nil {
+		return nil, err
+	}
+	services := make([]*core.Service, 0)
+	for _, ns := range kubernetesConfig.Namespaces {
+		kubernetesServices, err := GetKubernetesServices(client, ns.Name)
+		if err != nil {
+			return nil, err
+		}
+	skipExcluded:
+		for _, service := range kubernetesServices {
+			for _, excludedServiceSuffix := range kubernetesConfig.ExcludedServiceSuffixes {
+				if strings.HasSuffix(service.Name, excludedServiceSuffix) {
+					continue skipExcluded
+				}
+			}
+			for _, excludedService := range ns.ExcludedServices {
+				if service.Name == excludedService {
+					continue skipExcluded
+				}
+			}
+			// XXX: try to extract health from liveness probe endpoint?
+			var url, port string
+			if len(service.Spec.Ports) > 0 && !strings.Contains(ns.HostnameSuffix, ":") && strings.HasSuffix(ns.HostnameSuffix, ".svc.cluster.local") {
+				port = fmt.Sprintf(":%d", service.Spec.Ports[0].Port)
+			}
+			// If the path starts with a / or starts with a port
+			if strings.HasPrefix(ns.TargetPath, "/") {
+				url = fmt.Sprintf("http://%s%s%s%s", service.Name, ns.HostnameSuffix, port, ns.TargetPath)
+			} else {
+				url = fmt.Sprintf("http://%s%s%s/%s", service.Name, ns.HostnameSuffix, port, ns.TargetPath)
+			}
+			services = append(services, &core.Service{
+				Name:       service.Name,
+				URL:        url,
+				Interval:   kubernetesConfig.ServiceTemplate.Interval,
+				Conditions: kubernetesConfig.ServiceTemplate.Conditions,
+			})
+		}
+	}
+	return services, nil
+}

k8s/k8s.go

@@ -0,0 +1,10 @@
+package k8s
+
+import (
+	"k8s.io/api/core/v1"
+)
+
+// GetKubernetesServices return a list of Services from the given namespace
+func GetKubernetesServices(client KubernetesClientApi, namespace string) ([]v1.Service, error) {
+	return client.GetServices(namespace)
+}

k8stest/k8stest.go

@@ -0,0 +1,55 @@
+package k8stest
+
+import (
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+var (
+	mockedKubernetesClient *MockKubernetesClient
+)
+
+// MockKubernetesClient is a mocked implementation of k8s.KubernetesClientApi
+type MockKubernetesClient struct {
+	Services []v1.Service
+}
+
+// GetServices returns a list of services in a given namespace
+func (mock *MockKubernetesClient) GetServices(namespace string) ([]v1.Service, error) {
+	var services []v1.Service
+	for _, service := range mock.Services {
+		if service.Namespace == namespace {
+			services = append(services, service)
+		}
+	}
+	return services, nil
+}
+
+// GetMockedKubernetesClient returns a mocked implementation of k8s.KubernetesClientApi
+func GetMockedKubernetesClient() *MockKubernetesClient {
+	if mockedKubernetesClient != nil {
+		return mockedKubernetesClient
+	}
+	InitializeMockedKubernetesClient(nil)
+	return mockedKubernetesClient
+}
+
+// InitializeMockedKubernetesClient initializes a MockKubernetesClient with a given list of services
+func InitializeMockedKubernetesClient(services []v1.Service) {
+	mockedKubernetesClient = &MockKubernetesClient{
+		Services: services,
+	}
+}
+
+// CreateTestServices creates a mocked service for testing purposes
+func CreateTestServices(name, namespace string, port int32) v1.Service {
+	return v1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		Spec: v1.ServiceSpec{
+			Ports: []v1.ServicePort{{Name: "http", Protocol: v1.ProtocolTCP, Port: port}},
+		},
+	}
+}

main.go

@@ -1,37 +1,17 @@
 package main
 
 import (
-	"bytes"
-	"compress/gzip"
-	"github.com/TwinProduction/gatus/config"
-	"github.com/TwinProduction/gatus/watchdog"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"log"
-	"net/http"
 	"os"
-	"strings"
-	"time"
-)
 
-const CacheTTL = 10 * time.Second
-
-var (
-	cachedServiceResults          []byte
-	cachedServiceResultsGzipped   []byte
-	cachedServiceResultsTimestamp time.Time
+	"github.com/TwinProduction/gatus/config"
+	"github.com/TwinProduction/gatus/controller"
+	"github.com/TwinProduction/gatus/watchdog"
 )
 
 func main() {
 	cfg := loadConfiguration()
-	http.HandleFunc("/api/v1/results", serviceResultsHandler)
-	http.HandleFunc("/health", healthHandler)
-	http.Handle("/", GzipHandler(http.FileServer(http.Dir("./static"))))
-	if cfg.Metrics {
-		http.Handle("/metrics", promhttp.Handler())
-	}
-	log.Println("[main][main] Listening on port 8080")
 	go watchdog.Monitor(cfg)
-	log.Fatal(http.ListenAndServe(":8080", nil))
+	controller.Handle()
 }
 
 func loadConfiguration() *config.Config {
@@ -47,38 +27,3 @@ func loadConfiguration() *config.Config {
 	}
 	return config.Get()
 }
-
-func serviceResultsHandler(writer http.ResponseWriter, r *http.Request) {
-	if isExpired := cachedServiceResultsTimestamp.IsZero() || time.Now().Sub(cachedServiceResultsTimestamp) > CacheTTL; isExpired {
-		buffer := &bytes.Buffer{}
-		gzipWriter := gzip.NewWriter(buffer)
-		data, err := watchdog.GetJsonEncodedServiceResults()
-		if err != nil {
-			log.Printf("[main][serviceResultsHandler] Unable to marshal object to JSON: %s", err.Error())
-			writer.WriteHeader(http.StatusInternalServerError)
-			_, _ = writer.Write([]byte("Unable to marshal object to JSON"))
-			return
-		}
-		gzipWriter.Write(data)
-		gzipWriter.Close()
-		cachedServiceResults = data
-		cachedServiceResultsGzipped = buffer.Bytes()
-		cachedServiceResultsTimestamp = time.Now()
-	}
-	var data []byte
-	if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
-		writer.Header().Set("Content-Encoding", "gzip")
-		data = cachedServiceResultsGzipped
-	} else {
-		data = cachedServiceResults
-	}
-	writer.Header().Add("Content-type", "application/json")
-	writer.WriteHeader(http.StatusOK)
-	_, _ = writer.Write(data)
-}
-
-func healthHandler(writer http.ResponseWriter, _ *http.Request) {
-	writer.Header().Add("Content-type", "application/json")
-	writer.WriteHeader(http.StatusOK)
-	_, _ = writer.Write([]byte("{\"status\":\"UP\"}"))
-}

metric/metric.go

@@ -2,12 +2,13 @@ package metric
 
 import (
 	"fmt"
+	"strconv"
+	"sync"
+
 	"github.com/TwinProduction/gatus/config"
 	"github.com/TwinProduction/gatus/core"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	"strconv"
-	"sync"
 )
 
 var (
@@ -15,19 +16,21 @@ var (
 	rwLock sync.RWMutex
 )
 
+// PublishMetricsForService publishes metrics for the given service and its result.
+// These metrics will be exposed at /metrics if the metrics are enabled
 func PublishMetricsForService(service *core.Service, result *core.Result) {
 	if config.Get().Metrics {
 		rwLock.Lock()
-		gauge, exists := gauges[fmt.Sprintf("%s_%s", service.Name, service.Url)]
+		gauge, exists := gauges[fmt.Sprintf("%s_%s", service.Name, service.URL)]
 		if !exists {
 			gauge = promauto.NewGaugeVec(prometheus.GaugeOpts{
 				Subsystem:   "gatus",
 				Name:        "tasks",
-				ConstLabels: prometheus.Labels{"service": service.Name, "url": service.Url},
+				ConstLabels: prometheus.Labels{"service": service.Name, "url": service.URL},
 			}, []string{"status", "success"})
-			gauges[fmt.Sprintf("%s_%s", service.Name, service.Url)] = gauge
+			gauges[fmt.Sprintf("%s_%s", service.Name, service.URL)] = gauge
 		}
 		rwLock.Unlock()
-		gauge.WithLabelValues(strconv.Itoa(result.HttpStatus), strconv.FormatBool(result.Success)).Inc()
+		gauge.WithLabelValues(strconv.Itoa(result.HTTPStatus), strconv.FormatBool(result.Success)).Inc()
 	}
 }

pattern/pattern.go

@@ -0,0 +1,19 @@
+package pattern
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+// Match checks whether a string matches a pattern
+func Match(pattern, s string) bool {
+	if pattern == "*" {
+		return true
+	}
+	// Backslashes break filepath.Match, so we'll remove all of them.
+	// This has a pretty significant impact on performance when there
+	// are backslashes, but at least it doesn't break filepath.Match.
+	s = strings.ReplaceAll(s, "\\", "")
+	matched, _ := filepath.Match(pattern, s)
+	return matched
+}

pattern/pattern_bench_test.go

@@ -0,0 +1,21 @@
+package pattern
+
+import "testing"
+
+func BenchmarkMatch(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		if !Match("*ing*", "livingroom") {
+			b.Error("should've matched")
+		}
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkMatchWithBackslash(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		if !Match("*ing*", "living\\room") {
+			b.Error("should've matched")
+		}
+	}
+	b.ReportAllocs()
+}

pattern/pattern_test.go

@@ -0,0 +1,43 @@
+package pattern
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestMatch(t *testing.T) {
+	testMatch(t, "*", "livingroom_123", true)
+	testMatch(t, "**", "livingroom_123", true)
+	testMatch(t, "living*", "livingroom_123", true)
+	testMatch(t, "*living*", "livingroom_123", true)
+	testMatch(t, "*123", "livingroom_123", true)
+	testMatch(t, "*_*", "livingroom_123", true)
+	testMatch(t, "living*_*3", "livingroom_123", true)
+	testMatch(t, "living*room_*3", "livingroom_123", true)
+	testMatch(t, "living*room_*3", "livingroom_123", true)
+	testMatch(t, "*vin*om*2*", "livingroom_123", true)
+	testMatch(t, "livingroom_123", "livingroom_123", true)
+	testMatch(t, "*livingroom_123*", "livingroom_123", true)
+	testMatch(t, "*test*", "\\test", true)
+	testMatch(t, "livingroom", "livingroom_123", false)
+	testMatch(t, "livingroom123", "livingroom_123", false)
+	testMatch(t, "what", "livingroom_123", false)
+	testMatch(t, "*what*", "livingroom_123", false)
+	testMatch(t, "*.*", "livingroom_123", false)
+	testMatch(t, "room*123", "livingroom_123", false)
+}
+
+func testMatch(t *testing.T, pattern, key string, expectedToMatch bool) {
+	t.Run(fmt.Sprintf("pattern '%s' from '%s'", pattern, key), func(t *testing.T) {
+		matched := Match(pattern, key)
+		if expectedToMatch {
+			if !matched {
+				t.Errorf("%s should've matched pattern '%s'", key, pattern)
+			}
+		} else {
+			if matched {
+				t.Errorf("%s shouldn't have matched pattern '%s'", key, pattern)
+			}
+		}
+	})
+}

security/handler.go

@@ -0,0 +1,20 @@
+package security
+
+import (
+	"net/http"
+	"strings"
+)
+
+// Handler takes care of security for a given handler with the given security configuratioon
+func Handler(handler http.HandlerFunc, security *Config) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		usernameEntered, passwordEntered, ok := r.BasicAuth()
+		if !ok || usernameEntered != security.Basic.Username || Sha512(passwordEntered) != strings.ToLower(security.Basic.PasswordSha512Hash) {
+			w.Header().Set("WWW-Authenticate", "Basic")
+			w.WriteHeader(http.StatusUnauthorized)
+			_, _ = w.Write([]byte("Unauthorized"))
+			return
+		}
+		handler(w, r)
+	}
+}

security/handler_test.go

@@ -0,0 +1,58 @@
+package security
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func mockHandler(writer http.ResponseWriter, _ *http.Request) {
+	writer.WriteHeader(200)
+}
+
+func TestHandlerWhenNotAuthenticated(t *testing.T) {
+	handler := Handler(mockHandler, &Config{&BasicConfig{
+		Username:           "john.doe",
+		PasswordSha512Hash: "6b97ed68d14eb3f1aa959ce5d49c7dc612e1eb1dafd73b1e705847483fd6a6c809f2ceb4e8df6ff9984c6298ff0285cace6614bf8daa9f0070101b6c89899e22",
+	}})
+	request, _ := http.NewRequest("GET", "/api/v1/results", nil)
+	responseRecorder := httptest.NewRecorder()
+
+	handler.ServeHTTP(responseRecorder, request)
+
+	if responseRecorder.Code != http.StatusUnauthorized {
+		t.Error("Expected code to be 401, but was", responseRecorder.Code)
+	}
+}
+
+func TestHandlerWhenAuthenticated(t *testing.T) {
+	handler := Handler(mockHandler, &Config{&BasicConfig{
+		Username:           "john.doe",
+		PasswordSha512Hash: "6b97ed68d14eb3f1aa959ce5d49c7dc612e1eb1dafd73b1e705847483fd6a6c809f2ceb4e8df6ff9984c6298ff0285cace6614bf8daa9f0070101b6c89899e22",
+	}})
+	request, _ := http.NewRequest("GET", "/api/v1/results", nil)
+	request.SetBasicAuth("john.doe", "hunter2")
+	responseRecorder := httptest.NewRecorder()
+
+	handler.ServeHTTP(responseRecorder, request)
+
+	if responseRecorder.Code != http.StatusOK {
+		t.Error("Expected code to be 200, but was", responseRecorder.Code)
+	}
+}
+
+func TestHandlerWhenAuthenticatedWithBadCredentials(t *testing.T) {
+	handler := Handler(mockHandler, &Config{&BasicConfig{
+		Username:           "john.doe",
+		PasswordSha512Hash: "6b97ed68d14eb3f1aa959ce5d49c7dc612e1eb1dafd73b1e705847483fd6a6c809f2ceb4e8df6ff9984c6298ff0285cace6614bf8daa9f0070101b6c89899e22",
+	}})
+	request, _ := http.NewRequest("GET", "/api/v1/results", nil)
+	request.SetBasicAuth("john.doe", "bad-password")
+	responseRecorder := httptest.NewRecorder()
+
+	handler.ServeHTTP(responseRecorder, request)
+
+	if responseRecorder.Code != http.StatusUnauthorized {
+		t.Error("Expected code to be 401, but was", responseRecorder.Code)
+	}
+}

security/security.go

@@ -0,0 +1,25 @@
+package security
+
+// Config is the security configuration for Gatus
+type Config struct {
+	Basic *BasicConfig `yaml:"basic"`
+}
+
+// IsValid returns whether the security configuration is valid or not
+func (c *Config) IsValid() bool {
+	return c.Basic != nil && c.Basic.IsValid()
+}
+
+// BasicConfig is the configuration for Basic authentication
+type BasicConfig struct {
+	// Username is the name which will need to be used for a successful authentication
+	Username string `yaml:"username"`
+
+	// PasswordSha512Hash is the SHA512 hash of the password which will need to be used for a successful authentication
+	PasswordSha512Hash string `yaml:"password-sha512"`
+}
+
+// IsValid returns whether the basic security configuration is valid or not
+func (c *BasicConfig) IsValid() bool {
+	return len(c.Username) > 0 && len(c.PasswordSha512Hash) == 128
+}

security/security_test.go

@@ -0,0 +1,23 @@
+package security
+
+import "testing"
+
+func TestBasicConfig_IsValid(t *testing.T) {
+	basicConfig := &BasicConfig{
+		Username:           "admin",
+		PasswordSha512Hash: Sha512("test"),
+	}
+	if !basicConfig.IsValid() {
+		t.Error("basicConfig should've been valid")
+	}
+}
+
+func TestBasicConfig_IsValidWhenPasswordIsInvalid(t *testing.T) {
+	basicConfig := &BasicConfig{
+		Username:           "admin",
+		PasswordSha512Hash: "",
+	}
+	if basicConfig.IsValid() {
+		t.Error("basicConfig shouldn't have been valid")
+	}
+}

security/sha512.go

@@ -0,0 +1,13 @@
+package security
+
+import (
+	"crypto/sha512"
+	"fmt"
+)
+
+// Sha512 hashes a provided string using SHA512 and returns the resulting hash as a string
+func Sha512(s string) string {
+	hash := sha512.New()
+	hash.Write([]byte(s))
+	return fmt.Sprintf("%x", hash.Sum(nil))
+}

security/sha512_test.go

@@ -0,0 +1,12 @@
+package security
+
+import "testing"
+
+func TestSha512(t *testing.T) {
+	input := "password"
+	expectedHash := "b109f3bbbc244eb82441917ed06d618b9008dd09b3befd1b5e07394c706a8bb980b1d7785e5976ec049b46df5f1326af5a2ea6d103fd07c95385ffab0cacbc86"
+	hash := Sha512(input)
+	if hash != expectedHash {
+		t.Errorf("Expected hash to be '%s', but was '%s'", expectedHash, hash)
+	}
+}

static/index.html

@@ -3,298 +3,412 @@
 <head>
 	<title>Health Dashboard</title>
 	<meta name="viewport" content="width=device-width, initial-scale=1" />
-	<link rel="stylesheet" href="/bootstrap.min.css" />
+	<link rel="stylesheet" href="./bootstrap.min.css" />
 	<style>
-		html, body {
-			background-color: #f7f9fb;
-		}
-		html {
-			height: 100%;
-		}
-		#results div.container:first-child {
-			border-top-left-radius: 3px;
-			border-top-right-radius: 3px;
-		}
-		#results div.container:last-child {
-			border-bottom-left-radius: 3px;
-			border-bottom-right-radius: 3px;
-			border-bottom-width: 1px;
-			border-color: #dee2e6;
-			border-style: solid;
-		}
-		.status {
-			cursor: pointer;
-			transition: all 500ms ease-in-out;
-			overflow-x: hidden;
-			padding: .25em 0;
-			color: white;
-		}
-		.title {
-			font-size: 2.5rem;
-		}
-		.status:hover {
-			opacity: 0.7;
-			transition: opacity 100ms ease-in-out;
-			color: black;
-		}
-		.status-over-time {
-			overflow: auto;
-		}
-		.status-over-time>span:not(:last-child) {
-			margin-left: 2px;
-		}
-		.status-time-ago {
-			color: #6a737d;
-			opacity: 0.5;
-			margin-top: 5px;
-		}
-		.status-min-max-ms {
-			overflow-x: hidden;
-		}
-		#tooltip {
-			position: fixed;
-			top: 0;
-			left: 0;
-			background-color: white;
-			border: 1px solid lightgray;
-			border-radius: 4px;
-			padding: 6px;
-			font-size: 13px;
-		}
-		#tooltip code {
-			color: #212529;
-			line-height: 1;
-		}
-		#tooltip .tooltip-title {
-			font-weight: bold;
-			margin-bottom: 0;
-			display: block;
-		}
-		#tooltip .tooltip-title {
-			margin-top: 8px;
-		}
-		#tooltip>.tooltip-title:first-child {
-			margin-top: 0;
-		}
-		#social {
-			position: fixed;
-			right: 5px;
-			bottom: 5px;
-			padding: 5px;
-			margin: 0;
-			z-index: 100;
-		}
-		#social img {
-			opacity: 0.3;
-		}
-		#social img:hover {
-			opacity: 1;
-		}
+        html, body {
+            background-color: #f7f9fb;
+        }
+        html {
+            height: 100%;
+        }
+        #results div.container:first-child {
+            border-top-left-radius: 3px;
+            border-top-right-radius: 3px;
+        }
+        #results div.container:last-child {
+            border-bottom-left-radius: 3px;
+            border-bottom-right-radius: 3px;
+            border-bottom-width: 1px;
+            border-color: #dee2e6;
+            border-style: solid;
+        }
+        .status {
+            cursor: pointer;
+            transition: all 500ms ease-in-out;
+            overflow-x: hidden;
+            padding: .25em 0;
+            color: white;
+        }
+        .title {
+            font-size: 2.5rem;
+        }
+        .status:hover {
+            opacity: 0.7;
+            transition: opacity 100ms ease-in-out;
+            color: black;
+        }
+        .status-over-time {
+            overflow: auto;
+        }
+        .status-over-time>span:not(:last-child) {
+            margin-left: 2px;
+        }
+        .status-time-ago {
+            color: #6a737d;
+            opacity: 0.5;
+            margin-top: 5px;
+        }
+        .status-min-max-ms {
+            overflow-x: hidden;
+        }
+        #tooltip {
+            position: fixed;
+            top: 0;
+            left: 0;
+            background-color: white;
+            border: 1px solid lightgray;
+            border-radius: 4px;
+            padding: 6px;
+            font-size: 13px;
+        }
+        #tooltip code {
+            color: #212529;
+            line-height: 1;
+        }
+        #tooltip .tooltip-title {
+            font-weight: bold;
+            margin-bottom: 0;
+            display: block;
+        }
+        #tooltip .tooltip-title {
+            margin-top: 8px;
+        }
+        #tooltip>.tooltip-title:first-child {
+            margin-top: 0;
+        }
+        #social {
+            position: fixed;
+            right: 5px;
+            bottom: 5px;
+            padding: 5px;
+            margin: 0;
+            z-index: 100;
+        }
+        #social img {
+            opacity: 0.3;
+        }
+        #social img:hover {
+            opacity: 1;
+        }
+        #settings {
+            position: fixed;
+            left: 5px;
+            bottom: 5px;
+            padding: 5px;
+        }
+        #settings select:focus {
+            box-shadow: none;
+        }
+        .service-group {
+            cursor: pointer;
+            user-select: none;
+        }
+        .service-group h5:hover {
+            color: #1b1e21 !important;
+        }
 	</style>
 </head>
 <body>
-	<div class="container my-3 rounded p-3 border shadow">
-		<div class="mb-2">
-			<div class="row">
-				<div class="col-8 text-left my-auto">
-					<div class="title display-4">Health Status</div>
-				</div>
-				<div class="col-4 text-right">
-					<img src="logo.png" alt="Gatus" style="position: relative; min-width: 50px; max-width: 200px; width: 20%;"/>
-				</div>
+<div class="container my-3 rounded p-3 border shadow">
+	<div class="mb-2">
+		<div class="row">
+			<div class="col-8 text-left my-auto">
+				<div class="title display-4">Health Status</div>
+			</div>
+			<div class="col-4 text-right">
+				<img src="logo.png" alt="Gatus" style="position: relative; min-width: 50px; max-width: 200px; width: 20%;"/>
 			</div>
 		</div>
-		<div id="results"></div>
 	</div>
+	<div id="results"></div>
+</div>
 
-	<div id="tooltip" style="display: none">
-		<div class="tooltip-title">Timestamp:</div>
-		<code id="tooltip-timestamp">...</code>
-		<div class="tooltip-title">Response time:</div>
-		<code id="tooltip-response-time">...</code>
-		<div class="tooltip-title">Conditions:</div>
-		<code id="tooltip-conditions">...</code>
-		<div id="tooltip-errors-container">
-			<div class="tooltip-title">Errors:</div>
-			<code id="tooltip-errors">...</code>
+<div id="tooltip" style="display: none">
+	<div class="tooltip-title">Timestamp:</div>
+	<code id="tooltip-timestamp">...</code>
+	<div class="tooltip-title">Response time:</div>
+	<code id="tooltip-response-time">...</code>
+	<div class="tooltip-title">Conditions:</div>
+	<code id="tooltip-conditions">...</code>
+	<div id="tooltip-errors-container">
+		<div class="tooltip-title">Errors:</div>
+		<code id="tooltip-errors">...</code>
+	</div>
+</div>
+
+<script src="./jquery.min.js"></script>
+
+<div id="social">
+	<a href="https://github.com/TwinProduction/gatus" target="_blank" title="Gatus on GitHub">
+		<img src="./github.png" alt="GitHub" width="32" height="auto" />
+	</a>
+</div>
+
+<div id="settings">
+	<div class="input-group input-group-sm">
+		<div class="input-group-prepend">
+			<div class="input-group-text">&#x21bb;</div>
 		</div>
+		<select class="form-control form-control-sm" id="refresh-rate">
+			<option value="10">10s</option>
+			<option value="30" selected>30s</option>
+			<option value="60">1m</option>
+			<option value="120">2m</option>
+			<option value="300">5m</option>
+			<option value="600">10m</option>
+		</select>
 	</div>
+</div>
 
-	<script src="/jquery.min.js"></script>
+<script>
+	let serviceStatuses = {};
+	let timerHandler = 0;
+	let refreshIntervalHandler = 0;
+	let userClickedStatus = false;
 
-	<div id="social">
-		<a href="https://github.com/TwinProduction/gatus" target="_blank" title="Gatus on GitHub">
-			<img src="/github.png" alt="GitHub" width="32" height="auto" />
-		</a>
-	</div>
+	// TODO: make this variable configurable and persist the choice in localStorage
+	let showStatusOnHover = true;
 
-	<script>
-		let serviceStatuses = {};
-		let timerHandler = 0;
-		let userClickedStatus = false;
+	function showTooltip(serviceName, index, element) {
+		//userClickedStatus = false;
+		clearTimeout(timerHandler);
+		let serviceResult = serviceStatuses[serviceName].results[index];
+		$("#tooltip-timestamp").text(prettifyTimestamp(serviceResult.timestamp));
+		$("#tooltip-response-time").text(parseInt(serviceResult.duration/1000000) + "ms");
+		// Populate the condition section
+		let conditions = "";
+		for (let i in serviceResult['condition-results']) {
+			let conditionResult = serviceResult['condition-results'][i];
+			conditions += (conditionResult.success ? "&#10003;" : "X") + " ~ " + htmlEntities(conditionResult.condition) + "<br />";
+		}
+		$("#tooltip-conditions").html(conditions);
+		// Populate the error section only if there are errors
+		if (serviceResult.errors && serviceResult.errors.length > 0) {
+			let errors = "";
+			for (let i in serviceResult.errors) {
+				errors += "- " + htmlEntities(serviceResult.errors[i]) + "<br />";
+			}
+			$("#tooltip-errors").html(errors);
+			$("#tooltip-errors-container").show();
+		} else {
+			$("#tooltip-errors-container").hide();
+		}
+		// Position tooltip
+		$("#tooltip").css({top: "0px", left: "0px"}).show();
+		let targetTopPosition = element.getBoundingClientRect().y + 30;
+		let targetLeftPosition = element.getBoundingClientRect().x;
+		// Make adjustments if necessary
+		let tooltipBoundingClientRect = document.querySelector('#tooltip').getBoundingClientRect();
+		if (targetLeftPosition + window.scrollX + tooltipBoundingClientRect.width + 50 > document.body.getBoundingClientRect().width) {
+			targetLeftPosition = element.getBoundingClientRect().x - tooltipBoundingClientRect.width + element.getBoundingClientRect().width;
+			if (targetLeftPosition < 0) {
+				targetLeftPosition += -targetLeftPosition;
+			}
+		}
+		if (targetTopPosition + window.scrollY + tooltipBoundingClientRect.height + 50 > document.body.getBoundingClientRect().height && targetTopPosition >= 0) {
+			targetTopPosition = element.getBoundingClientRect().y - (tooltipBoundingClientRect.height + 10);
+			if (targetTopPosition < 0) {
+				targetTopPosition = element.getBoundingClientRect().y + 30;
+			}
+		}
+		$("#tooltip").css({top: targetTopPosition + "px", left: targetLeftPosition + "px"});
+	}
 
-		function showTooltip(serviceName, index, element) {
+	function fadeTooltip() {
+		if (!userClickedStatus) {
+			timerHandler = setTimeout(function () {
+				$("#tooltip").hide();
+			}, 500);
+		}
+	}
+
+	function toggleTooltip(serviceName, index, element) {
+		console.log("userClickedStatus="+userClickedStatus);
+		if (!userClickedStatus) {
+			showTooltip(serviceName, index, element);
+			userClickedStatus = true;
+		} else {
+			$("#tooltip").hide();
 			userClickedStatus = false;
-			clearTimeout(timerHandler);
-			let serviceResult = serviceStatuses[serviceName][index];
-			$("#tooltip-timestamp").text(prettifyTimestamp(serviceResult.timestamp));
-			$("#tooltip-response-time").text(parseInt(serviceResult.duration/1000000) + "ms");
-			// Populate the condition section
-			let conditions = "";
-			for (let i in serviceResult['condition-results']) {
-				let conditionResult = serviceResult['condition-results'][i];
-				conditions += (conditionResult.success ? "&#10003;" : "X") + " ~ " + htmlEntities(conditionResult.condition) + "<br />";
-			}
-			$("#tooltip-conditions").html(conditions);
-			// Populate the error section only if there are errors
-			if (serviceResult.errors && serviceResult.errors.length > 0) {
-				let errors = "";
-				for (let i in serviceResult.errors) {
-					errors += "- " + htmlEntities(serviceResult.errors[i]) + "<br />";
-				}
-				$("#tooltip-errors").html(errors);
-				$("#tooltip-errors-container").show();
+		}
+	}
+
+	function createStatusBadge(serviceStatusIndex, index, success) {
+		if (success) {
+			if (showStatusOnHover) {
+				return "<span class='status badge badge-success' style='width: 5%' onmouseenter='showTooltip(\"" + serviceStatusIndex + "\", " + index + ", this)' onmouseleave='fadeTooltip()' onclick='userClickedStatus = !userClickedStatus;'>&#10003;</span>";
 			} else {
-				$("#tooltip-errors-container").hide();
+				return "<span class='status badge badge-success' style='width: 5%' onclick='toggleTooltip(\"" + serviceStatusIndex + "\", " + index + ", this)'>&#10003;</span>";
 			}
-			// Position tooltip
-			$("#tooltip").css({top: "0px", left: "0px"}).show();
-			let targetTopPosition = element.getBoundingClientRect().y + 30;
-			let targetLeftPosition = element.getBoundingClientRect().x;
-			// Make adjustments if necessary
-			let tooltipBoundingClientRect = document.querySelector('#tooltip').getBoundingClientRect();
-			if (targetLeftPosition + window.scrollX + tooltipBoundingClientRect.width + 50 > document.body.getBoundingClientRect().width) {
-				targetLeftPosition = element.getBoundingClientRect().x - tooltipBoundingClientRect.width + element.getBoundingClientRect().width;
-				if (targetLeftPosition < 0) {
-					targetLeftPosition += -targetLeftPosition;
+		}
+		if (showStatusOnHover) {
+			return "<span class='status badge badge-danger' style='width: 5%' onmouseenter='showTooltip(\"" + serviceStatusIndex + "\", " + index + ", this)' onmouseleave='fadeTooltip()' onclick='userClickedStatus = !userClickedStatus;'>X</span>";
+		} else {
+			return "<span class='status badge badge-danger' style='width: 5%' onclick='toggleTooltip(\"" + serviceStatusIndex + "\", " + index + ", this)'>X</span>";
+		}
+	}
+
+	function refreshStatuses() {
+		$.getJSON("./api/v1/statuses", function (data) {
+			// Update the table only if there's a change
+			if (JSON.stringify(serviceStatuses) !== JSON.stringify(data)) {
+				serviceStatuses = data;
+				buildTable();
+			}
+		});
+	}
+
+	function buildTable() {
+		let outputByGroup = {};
+		for (let serviceStatusIndex in serviceStatuses) {
+			let serviceStatusOverTime = "";
+			let serviceStatus = serviceStatuses[serviceStatusIndex];
+			let hostname = serviceStatus.results[serviceStatus.results.length-1].hostname;
+			let minResponseTime = null;
+			let maxResponseTime = null;
+			let newestTimestamp = null;
+			let oldestTimestamp = null;
+			for (let resultIndex in serviceStatus.results) {
+				let serviceResult = serviceStatus.results[resultIndex];
+				serviceStatusOverTime = createStatusBadge(serviceStatusIndex, resultIndex, serviceResult.success) + serviceStatusOverTime;
+				const responseTime = parseInt(serviceResult.duration/1000000);
+				if (minResponseTime == null || minResponseTime > responseTime) {
+					minResponseTime = responseTime;
+				}
+				if (maxResponseTime == null || maxResponseTime < responseTime) {
+					maxResponseTime = responseTime;
+				}
+				const timestamp = new Date(serviceResult.timestamp);
+				if (newestTimestamp == null || newestTimestamp < timestamp) {
+					newestTimestamp = timestamp;
+				}
+				if (oldestTimestamp == null || oldestTimestamp > timestamp) {
+					oldestTimestamp = timestamp;
 				}
 			}
-			if (targetTopPosition + window.scrollY + tooltipBoundingClientRect.height + 50 > document.body.getBoundingClientRect().height && targetTopPosition >= 0) {
-				targetTopPosition = element.getBoundingClientRect().y - (tooltipBoundingClientRect.height + 10);
-				if (targetTopPosition < 0) {
-					targetTopPosition = element.getBoundingClientRect().y + 30;
-				}
+			let output = ""
+				+ "<div class='container py-3 border-left border-right border-top border-black rounded-0'>"
+				+ "  <div class='row mb-2'>"
+				+ "    <div class='col-md-10'>"
+				+ "      <span class='font-weight-bold'>" + serviceStatus.name + "</span> <span class='text-secondary font-weight-lighter'>- " + hostname + "</span>"
+				+ "    </div>"
+				+ "    <div class='col-md-2 text-right'>"
+				+ "      <span class='font-weight-lighter status-min-max-ms'>" + (minResponseTime === maxResponseTime ? minResponseTime : (minResponseTime + "-" + maxResponseTime)) + "ms</span>"
+				+ "    </div>"
+				+ "  </div>"
+				+ "  <div class='row'>"
+				+ "    <div class='col-12 d-flex flex-row-reverse status-over-time'>"
+				+ "      " + serviceStatusOverTime
+				+ "    </div>"
+				+ "  </div>"
+				+ "  <div class='row status-time-ago'>"
+				+ "    <div class='col-6'>"
+				+ "      " + generatePrettyTimeAgo(oldestTimestamp)
+				+ "    </div>"
+				+ "    <div class='col-6 text-right'>"
+				+ "      " + generatePrettyTimeAgo(newestTimestamp)
+				+ "    </div>"
+				+ "  </div>"
+				+ "</div>";
+			// create an empty entry if this group is new
+			if (!outputByGroup[serviceStatus.group]) {
+				outputByGroup[serviceStatus.group] = "";
 			}
-			$("#tooltip").css({top: targetTopPosition + "px", left: targetLeftPosition + "px"});
+			outputByGroup[serviceStatus.group] += output;
 		}
-
-		function fadeTooltip() {
-			if (!userClickedStatus) {
-				timerHandler = setTimeout(function () {
-					$("#tooltip").hide();
-				}, 500);
+		let output = "";
+		for (let group in outputByGroup) {
+			// Services that don't have a group should be skipped and left for last
+			if (group === 'undefined') {
+				continue
 			}
-		}
-
-		function createStatusBadge(serviceName, index, success) {
-			if (success) {
-				return "<span class='status badge badge-success' style='width: 5%' onmouseenter='showTooltip(\""+serviceName+"\", "+index+", this)' onmouseleave='fadeTooltip()' onclick='userClickedStatus = !userClickedStatus;'>&#10003;</span>";
+			let key = group.replace(/[^a-zA-Z0-9]/g, '');
+			let existingGroupContentSelector = $("#service-group-" + key + "-content");
+			let isCurrentlyHidden = existingGroupContentSelector.length && existingGroupContentSelector[0].style.display === 'none';
+			let groupStatus = "<span class='text-success'>&#10003;</span>";
+			if (outputByGroup[group].includes("badge badge-danger")) {
+				groupStatus = "<span class='text-warning'>~</span>";
 			}
-			return "<span class='status badge badge-danger' style='width: 5%' onmouseenter='showTooltip(\""+serviceName+"\", "+index+", this)' onmouseleave='fadeTooltip()' onclick='userClickedStatus = !userClickedStatus;'>X</span>";
+			output += ""
+				+ "<div class='mt-" + (output.length ? '4' : '3') + "'>"
+				+ "  <div class='container pt-2 border-left border-right border-top border-black border-bottom service-group' id='service-group-" + key + "' data-group='" + key + "' onclick='toggleGroup(this)'>"
+				+ "    <h5 class='text-secondary text-monospace pb-0'>"
+				+ "      " + groupStatus + " " + group
+				+ "      <span class='float-right service-group-arrow' id='service-group-" + key + "-arrow'>" + (isCurrentlyHidden ? "&#9660;" : "&#9650;") + "</span>"
+				+ "    </h5>"
+				+ "  </div>"
+				+ "  <div class='service-group-content' id='service-group-" + key + "-content' style='" + (isCurrentlyHidden ? "display: none;" : "") + "'>"
+				+ "    " + outputByGroup[group]
+				+ "  </div>"
+				+ "</div>";
 		}
-
-		function refreshResults() {
-			$.getJSON("/api/v1/results", function (data) {
-				// Update the table only if there's a change
-				if (JSON.stringify(serviceStatuses) !== JSON.stringify(data)) {
-					serviceStatuses = data;
-					buildTable();
-				}
-			});
+		// Add all services that don't have a group at the end
+		if (outputByGroup['undefined']) {
+			output += ""
+				+ "<div class='mt-" + (output.length ? '4' : '3') + "'>"
+				+ "  " + outputByGroup['undefined']
+				+ "</div>"
 		}
+		$("#results").html(output);
+	}
 
-		function buildTable() {
-			let output = "";
-			for (let serviceName in serviceStatuses) {
-				let serviceStatusOverTime = "";
-				let hostname = serviceStatuses[serviceName][serviceStatuses[serviceName].length-1].hostname
-				let minResponseTime = null;
-				let maxResponseTime = null;
-				let newestTimestamp = null;
-				let oldestTimestamp = null;
-				for (let key in serviceStatuses[serviceName]) {
-					let serviceResult = serviceStatuses[serviceName][key];
-					serviceStatusOverTime = createStatusBadge(serviceName, key, serviceResult.success) + serviceStatusOverTime;
-					const responseTime = parseInt(serviceResult.duration/1000000);
-					if (minResponseTime == null || minResponseTime > responseTime) {
-						minResponseTime = responseTime;
-					}
-					if (maxResponseTime == null || maxResponseTime < responseTime) {
-						maxResponseTime = responseTime;
-					}
-					const timestamp = new Date(serviceResult.timestamp);
-					if (newestTimestamp == null || newestTimestamp < timestamp) {
-						newestTimestamp = timestamp;
-					}
-					if (oldestTimestamp == null || oldestTimestamp > timestamp) {
-						oldestTimestamp = timestamp;
-					}
-				}
-				output += ""
-					+ "<div class='container py-3 border-left border-right border-top border-black'>"
-					+ "  <div class='row mb-2'>"
-					+ "    <div class='col-md-10'>"
-					+ "      <span class='font-weight-bold'>" + serviceName + "</span> <span class='text-secondary font-weight-lighter'>- " + hostname + "</span>"
-					+ "    </div>"
-					+ "    <div class='col-md-2 text-right'>"
-					+ "      <span class='font-weight-lighter status-min-max-ms'>" + (minResponseTime === maxResponseTime ? minResponseTime : (minResponseTime + "-" + maxResponseTime)) + "ms</span>"
-					+ "    </div>"
-					+ "  </div>"
-					+ "  <div class='row'>"
-					+ "    <div class='col-12 d-flex flex-row-reverse status-over-time'>"
-					+ "      " + serviceStatusOverTime
-					+ "    </div>"
-					+ "  </div>"
-					+ "  <div class='row status-time-ago'>"
-					+ "    <div class='col-6'>"
-					+ "      " + generatePrettyTimeAgo(oldestTimestamp)
-					+ "    </div>"
-					+ "    <div class='col-6 text-right'>"
-					+ "      " + generatePrettyTimeAgo(newestTimestamp)
-					+ "    </div>"
-					+ "  </div>"
-					+ "</div>";
+	function toggleGroup(element) {
+		let selector = $("#service-group-" + element.dataset.group + "-content");
+		selector.toggle("fast", function() {
+			if (selector.length && selector[0].style.display === 'none') {
+				$("#service-group-" + element.dataset.group + "-arrow").html("&#9660;");
+			} else {
+				$("#service-group-" + element.dataset.group + "-arrow").html("&#9650;");
 			}
-			$("#results").html(output);
-		}
+		});
+	}
 
-		function prettifyTimestamp(timestamp) {
-			let date = new Date(timestamp);
-			let YYYY = date.getFullYear();
-			let MM = ((date.getMonth()+1)<10?"0":"")+""+(date.getMonth()+1);
-			let DD = ((date.getDate())<10?"0":"")+""+(date.getDate());
-			let hh = ((date.getHours())<10?"0":"")+""+(date.getHours());
-			let mm = ((date.getMinutes())<10?"0":"")+""+(date.getMinutes());
-			let ss = ((date.getSeconds())<10?"0":"")+""+(date.getSeconds());
-			return YYYY + "-" + MM + "-" + DD + " " + hh + ":" + mm + ":" + ss;
-		}
+	function prettifyTimestamp(timestamp) {
+		let date = new Date(timestamp);
+		let YYYY = date.getFullYear();
+		let MM = ((date.getMonth()+1)<10?"0":"")+""+(date.getMonth()+1);
+		let DD = ((date.getDate())<10?"0":"")+""+(date.getDate());
+		let hh = ((date.getHours())<10?"0":"")+""+(date.getHours());
+		let mm = ((date.getMinutes())<10?"0":"")+""+(date.getMinutes());
+		let ss = ((date.getSeconds())<10?"0":"")+""+(date.getSeconds());
+		return YYYY + "-" + MM + "-" + DD + " " + hh + ":" + mm + ":" + ss;
+	}
 
-		function generatePrettyTimeAgo(t) {
-			let differenceInMs = new Date().getTime() - new Date(t).getTime();
-			if (differenceInMs > 3600000) {
-				let hours = (differenceInMs/3600000).toFixed(0);
-				return hours + " hour" + (hours !== "1" ? "s" : "") + " ago";
-			}
-			if (differenceInMs > 60000) {
-				let minutes = (differenceInMs/60000).toFixed(0);
-				return minutes + " minute" + (minutes !== "1" ? "s" : "") + " ago";
-			}
-			return (differenceInMs/1000).toFixed(0) + " seconds ago";
+	function generatePrettyTimeAgo(t) {
+		let differenceInMs = new Date().getTime() - new Date(t).getTime();
+		if (differenceInMs > 3600000) {
+			let hours = (differenceInMs/3600000).toFixed(0);
+			return hours + " hour" + (hours !== "1" ? "s" : "") + " ago";
 		}
-
-		function htmlEntities(s) {
-			return String(s)
-				.replace(/&/g, '&amp;')
-				.replace(/</g, '&lt;')
-				.replace(/>/g, '&gt;')
-				.replace(/"/g, '&quot;')
-				.replace(/'/g, '&apos;');
+		if (differenceInMs > 60000) {
+			let minutes = (differenceInMs/60000).toFixed(0);
+			return minutes + " minute" + (minutes !== "1" ? "s" : "") + " ago";
 		}
+		return (differenceInMs/1000).toFixed(0) + " seconds ago";
+	}
 
-		refreshResults();
-		setInterval(function() {
-			refreshResults();
-		}, 30000);
-	</script>
+	function htmlEntities(s) {
+		return String(s)
+			.replace(/&/g, '&amp;')
+			.replace(/</g, '&lt;')
+			.replace(/>/g, '&gt;')
+			.replace(/"/g, '&quot;')
+			.replace(/'/g, '&apos;');
+	}
+
+	function setRefreshInterval(seconds) {
+		refreshStatuses();
+		refreshIntervalHandler = setInterval(function() {
+			refreshStatuses();
+		}, seconds * 1000);
+	}
+
+	$("#refresh-rate").change(function() {
+		clearInterval(refreshIntervalHandler);
+		setRefreshInterval($(this).val());
+	});
+	setRefreshInterval(30);
+	$("#refresh-rate").val(30);
+</script>
 </body>
-</html>
+</html>

storage/memory.go

@@ -0,0 +1,61 @@
+package storage
+
+import (
+	"encoding/json"
+	"fmt"
+	"sync"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+// InMemoryStore implements an in-memory store
+type InMemoryStore struct {
+	serviceStatuses     map[string]*core.ServiceStatus
+	serviceResultsMutex sync.RWMutex
+}
+
+// NewInMemoryStore returns an in-memory store. Note that the store acts as a singleton, so although new-ing
+// up in-memory stores will give you a unique reference to a struct each time, all structs returned
+// by this function will act on the same in-memory store.
+func NewInMemoryStore() *InMemoryStore {
+	return &InMemoryStore{
+		serviceStatuses: make(map[string]*core.ServiceStatus),
+	}
+}
+
+// GetAllAsJSON returns the JSON encoding of all monitored core.ServiceStatus
+func (ims *InMemoryStore) GetAllAsJSON() ([]byte, error) {
+	ims.serviceResultsMutex.RLock()
+	serviceStatuses, err := json.Marshal(ims.serviceStatuses)
+	ims.serviceResultsMutex.RUnlock()
+	return serviceStatuses, err
+}
+
+// GetServiceStatus returns the service status for a given service name in the given group
+func (ims *InMemoryStore) GetServiceStatus(group, name string) *core.ServiceStatus {
+	key := fmt.Sprintf("%s_%s", group, name)
+	ims.serviceResultsMutex.RLock()
+	serviceStatus := ims.serviceStatuses[key]
+	ims.serviceResultsMutex.RUnlock()
+	return serviceStatus
+}
+
+// Insert inserts the observed result for the specified service into the in memory store
+func (ims *InMemoryStore) Insert(service *core.Service, result *core.Result) {
+	key := fmt.Sprintf("%s_%s", service.Group, service.Name)
+	ims.serviceResultsMutex.Lock()
+	serviceStatus, exists := ims.serviceStatuses[key]
+	if !exists {
+		serviceStatus = core.NewServiceStatus(service)
+		ims.serviceStatuses[key] = serviceStatus
+	}
+	serviceStatus.AddResult(result)
+	ims.serviceResultsMutex.Unlock()
+}
+
+// Clear will empty all the results from the in memory store
+func (ims *InMemoryStore) Clear() {
+	ims.serviceResultsMutex.Lock()
+	ims.serviceStatuses = make(map[string]*core.ServiceStatus)
+	ims.serviceResultsMutex.Unlock()
+}

storage/memory_test.go

@@ -0,0 +1,201 @@
+package storage
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/TwinProduction/gatus/core"
+)
+
+var (
+	firstCondition  = core.Condition("[STATUS] == 200")
+	secondCondition = core.Condition("[RESPONSE_TIME] < 500")
+	thirdCondition  = core.Condition("[CERTIFICATE_EXPIRATION] < 72h")
+
+	timestamp = time.Now()
+
+	testService = core.Service{
+		Name:                    "name",
+		Group:                   "group",
+		URL:                     "https://example.org/what/ever",
+		Method:                  "GET",
+		Body:                    "body",
+		Interval:                30 * time.Second,
+		Conditions:              []*core.Condition{&firstCondition, &secondCondition, &thirdCondition},
+		Alerts:                  nil,
+		Insecure:                false,
+		NumberOfFailuresInARow:  0,
+		NumberOfSuccessesInARow: 0,
+	}
+	testSuccessfulResult = core.Result{
+		Hostname:              "example.org",
+		IP:                    "127.0.0.1",
+		HTTPStatus:            200,
+		Body:                  []byte("body"),
+		Errors:                nil,
+		Connected:             true,
+		Success:               true,
+		Timestamp:             timestamp,
+		Duration:              150 * time.Millisecond,
+		CertificateExpiration: 10 * time.Hour,
+		ConditionResults: []*core.ConditionResult{
+			{
+				Condition: "[STATUS] == 200",
+				Success:   true,
+			},
+			{
+				Condition: "[RESPONSE_TIME] < 500",
+				Success:   true,
+			},
+			{
+				Condition: "[CERTIFICATE_EXPIRATION] < 72h",
+				Success:   true,
+			},
+		},
+	}
+	testUnsuccessfulResult = core.Result{
+		Hostname:              "example.org",
+		IP:                    "127.0.0.1",
+		HTTPStatus:            200,
+		Body:                  []byte("body"),
+		Errors:                []string{"error-1", "error-2"},
+		Connected:             true,
+		Success:               false,
+		Timestamp:             timestamp,
+		Duration:              750 * time.Millisecond,
+		CertificateExpiration: 10 * time.Hour,
+		ConditionResults: []*core.ConditionResult{
+			{
+				Condition: "[STATUS] == 200",
+				Success:   true,
+			},
+			{
+				Condition: "[RESPONSE_TIME] < 500",
+				Success:   false,
+			},
+			{
+				Condition: "[CERTIFICATE_EXPIRATION] < 72h",
+				Success:   false,
+			},
+		},
+	}
+)
+
+func TestInMemoryStore_Insert(t *testing.T) {
+	store := NewInMemoryStore()
+	store.Insert(&testService, &testSuccessfulResult)
+	store.Insert(&testService, &testUnsuccessfulResult)
+
+	if len(store.serviceStatuses) != 1 {
+		t.Fatalf("expected 1 ServiceStatus, got %d", len(store.serviceStatuses))
+	}
+	key := fmt.Sprintf("%s_%s", testService.Group, testService.Name)
+	serviceStatus, exists := store.serviceStatuses[key]
+	if !exists {
+		t.Fatalf("Store should've had key '%s', but didn't", key)
+	}
+	if len(serviceStatus.Results) != 2 {
+		t.Fatalf("Service '%s' should've had 2 results, but actually returned %d", serviceStatus.Name, len(serviceStatus.Results))
+	}
+	for i, r := range serviceStatus.Results {
+		expectedResult := store.GetServiceStatus(testService.Group, testService.Name).Results[i]
+		if r.HTTPStatus != expectedResult.HTTPStatus {
+			t.Errorf("Result at index %d should've had a HTTPStatus of %d, but was actually %d", i, expectedResult.HTTPStatus, r.HTTPStatus)
+		}
+		if r.DNSRCode != expectedResult.DNSRCode {
+			t.Errorf("Result at index %d should've had a DNSRCode of %s, but was actually %s", i, expectedResult.DNSRCode, r.DNSRCode)
+		}
+		if len(r.Body) != len(expectedResult.Body) {
+			t.Errorf("Result at index %d should've had a body of length %d, but was actually %d", i, len(expectedResult.Body), len(r.Body))
+		}
+		if r.Hostname != expectedResult.Hostname {
+			t.Errorf("Result at index %d should've had a Hostname of %s, but was actually %s", i, expectedResult.Hostname, r.Hostname)
+		}
+		if r.IP != expectedResult.IP {
+			t.Errorf("Result at index %d should've had a IP of %s, but was actually %s", i, expectedResult.IP, r.IP)
+		}
+		if r.Connected != expectedResult.Connected {
+			t.Errorf("Result at index %d should've had a Connected value of %t, but was actually %t", i, expectedResult.Connected, r.Connected)
+		}
+		if r.Duration != expectedResult.Duration {
+			t.Errorf("Result at index %d should've had a Duration of %s, but was actually %s", i, expectedResult.Duration.String(), r.Duration.String())
+		}
+		if len(r.Errors) != len(expectedResult.Errors) {
+			t.Errorf("Result at index %d should've had %d errors, but actually had %d errors", i, len(expectedResult.Errors), len(r.Errors))
+		}
+		if len(r.ConditionResults) != len(expectedResult.ConditionResults) {
+			t.Errorf("Result at index %d should've had %d ConditionResults, but actually had %d ConditionResults", i, len(expectedResult.ConditionResults), len(r.ConditionResults))
+		}
+		if r.Success != expectedResult.Success {
+			t.Errorf("Result at index %d should've had a Success of %t, but was actually %t", i, expectedResult.Success, r.Success)
+		}
+		if r.Timestamp != expectedResult.Timestamp {
+			t.Errorf("Result at index %d should've had a Timestamp of %s, but was actually %s", i, expectedResult.Timestamp.String(), r.Timestamp.String())
+		}
+		if r.CertificateExpiration != expectedResult.CertificateExpiration {
+			t.Errorf("Result at index %d should've had a CertificateExpiration of %s, but was actually %s", i, expectedResult.CertificateExpiration.String(), r.CertificateExpiration.String())
+		}
+	}
+}
+
+func TestInMemoryStore_GetServiceStatus(t *testing.T) {
+	store := NewInMemoryStore()
+	store.Insert(&testService, &testSuccessfulResult)
+	store.Insert(&testService, &testUnsuccessfulResult)
+
+	serviceStatus := store.GetServiceStatus(testService.Group, testService.Name)
+	if serviceStatus == nil {
+		t.Fatalf("serviceStatus shouldn't have been nil")
+	}
+	if serviceStatus.Uptime == nil {
+		t.Fatalf("serviceStatus.Uptime shouldn't have been nil")
+	}
+	if serviceStatus.Uptime.LastHour != 0.5 {
+		t.Errorf("serviceStatus.Uptime.LastHour should've been 0.5")
+	}
+	if serviceStatus.Uptime.LastTwentyFourHours != 0.5 {
+		t.Errorf("serviceStatus.Uptime.LastTwentyFourHours should've been 0.5")
+	}
+	if serviceStatus.Uptime.LastSevenDays != 0.5 {
+		t.Errorf("serviceStatus.Uptime.LastSevenDays should've been 0.5")
+	}
+	fmt.Println(serviceStatus.Results[0].Timestamp.Format(time.RFC3339))
+}
+
+func TestInMemoryStore_GetServiceStatusForMissingStatusReturnsNil(t *testing.T) {
+	store := NewInMemoryStore()
+	store.Insert(&testService, &testSuccessfulResult)
+
+	serviceStatus := store.GetServiceStatus("nonexistantgroup", "nonexistantname")
+	if serviceStatus != nil {
+		t.Errorf("Returned service status for group '%s' and name '%s' not nil after inserting the service into the store", testService.Group, testService.Name)
+	}
+	serviceStatus = store.GetServiceStatus(testService.Group, "nonexistantname")
+	if serviceStatus != nil {
+		t.Errorf("Returned service status for group '%s' and name '%s' not nil after inserting the service into the store", testService.Group, "nonexistantname")
+	}
+	serviceStatus = store.GetServiceStatus("nonexistantgroup", testService.Name)
+	if serviceStatus != nil {
+		t.Errorf("Returned service status for group '%s' and name '%s' not nil after inserting the service into the store", "nonexistantgroup", testService.Name)
+	}
+}
+
+func TestInMemoryStore_GetAllAsJSON(t *testing.T) {
+	store := NewInMemoryStore()
+	firstResult := &testSuccessfulResult
+	secondResult := &testUnsuccessfulResult
+	store.Insert(&testService, firstResult)
+	store.Insert(&testService, secondResult)
+	// Can't be bothered dealing with timezone issues on the worker that runs the automated tests
+	firstResult.Timestamp = time.Time{}
+	secondResult.Timestamp = time.Time{}
+	output, err := store.GetAllAsJSON()
+	if err != nil {
+		t.Fatal("shouldn't have returned an error, got", err.Error())
+	}
+	expectedOutput := `{"group_name":{"name":"name","group":"group","results":[{"status":200,"hostname":"example.org","duration":150000000,"errors":null,"condition-results":[{"condition":"[STATUS] == 200","success":true},{"condition":"[RESPONSE_TIME] \u003c 500","success":true},{"condition":"[CERTIFICATE_EXPIRATION] \u003c 72h","success":true}],"success":true,"timestamp":"0001-01-01T00:00:00Z"},{"status":200,"hostname":"example.org","duration":750000000,"errors":["error-1","error-2"],"condition-results":[{"condition":"[STATUS] == 200","success":true},{"condition":"[RESPONSE_TIME] \u003c 500","success":false},{"condition":"[CERTIFICATE_EXPIRATION] \u003c 72h","success":false}],"success":false,"timestamp":"0001-01-01T00:00:00Z"}],"uptime":{"7d":0.5,"24h":0.5,"1h":0.5}}}`
+	if string(output) != expectedOutput {
+		t.Errorf("expected:\n %s\n\ngot:\n %s", expectedOutput, string(output))
+	}
+}

vendor/cloud.google.com/go/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
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+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+      the terms of any separate license agreement you may have executed
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+
+   6. Trademarks. This License does not grant permission to use the trade
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/cloud.google.com/go/compute/metadata/metadata.go

@@ -0,0 +1,519 @@
+// Copyright 2014 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package metadata provides access to Google Compute Engine (GCE)
+// metadata and API service accounts.
+//
+// This package is a wrapper around the GCE metadata service,
+// as documented at https://developers.google.com/compute/docs/metadata.
+package metadata // import "cloud.google.com/go/compute/metadata"
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+	"time"
+)
+
+const (
+	// metadataIP is the documented metadata server IP address.
+	metadataIP = "169.254.169.254"
+
+	// metadataHostEnv is the environment variable specifying the
+	// GCE metadata hostname.  If empty, the default value of
+	// metadataIP ("169.254.169.254") is used instead.
+	// This is variable name is not defined by any spec, as far as
+	// I know; it was made up for the Go package.
+	metadataHostEnv = "GCE_METADATA_HOST"
+
+	userAgent = "gcloud-golang/0.1"
+)
+
+type cachedValue struct {
+	k    string
+	trim bool
+	mu   sync.Mutex
+	v    string
+}
+
+var (
+	projID  = &cachedValue{k: "project/project-id", trim: true}
+	projNum = &cachedValue{k: "project/numeric-project-id", trim: true}
+	instID  = &cachedValue{k: "instance/id", trim: true}
+)
+
+var defaultClient = &Client{hc: &http.Client{
+	Transport: &http.Transport{
+		Dial: (&net.Dialer{
+			Timeout:   2 * time.Second,
+			KeepAlive: 30 * time.Second,
+		}).Dial,
+	},
+}}
+
+// NotDefinedError is returned when requested metadata is not defined.
+//
+// The underlying string is the suffix after "/computeMetadata/v1/".
+//
+// This error is not returned if the value is defined to be the empty
+// string.
+type NotDefinedError string
+
+func (suffix NotDefinedError) Error() string {
+	return fmt.Sprintf("metadata: GCE metadata %q not defined", string(suffix))
+}
+
+func (c *cachedValue) get(cl *Client) (v string, err error) {
+	defer c.mu.Unlock()
+	c.mu.Lock()
+	if c.v != "" {
+		return c.v, nil
+	}
+	if c.trim {
+		v, err = cl.getTrimmed(c.k)
+	} else {
+		v, err = cl.Get(c.k)
+	}
+	if err == nil {
+		c.v = v
+	}
+	return
+}
+
+var (
+	onGCEOnce sync.Once
+	onGCE     bool
+)
+
+// OnGCE reports whether this process is running on Google Compute Engine.
+func OnGCE() bool {
+	onGCEOnce.Do(initOnGCE)
+	return onGCE
+}
+
+func initOnGCE() {
+	onGCE = testOnGCE()
+}
+
+func testOnGCE() bool {
+	// The user explicitly said they're on GCE, so trust them.
+	if os.Getenv(metadataHostEnv) != "" {
+		return true
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	resc := make(chan bool, 2)
+
+	// Try two strategies in parallel.
+	// See https://github.com/googleapis/google-cloud-go/issues/194
+	go func() {
+		req, _ := http.NewRequest("GET", "http://"+metadataIP, nil)
+		req.Header.Set("User-Agent", userAgent)
+		res, err := defaultClient.hc.Do(req.WithContext(ctx))
+		if err != nil {
+			resc <- false
+			return
+		}
+		defer res.Body.Close()
+		resc <- res.Header.Get("Metadata-Flavor") == "Google"
+	}()
+
+	go func() {
+		addrs, err := net.DefaultResolver.LookupHost(ctx, "metadata.google.internal")
+		if err != nil || len(addrs) == 0 {
+			resc <- false
+			return
+		}
+		resc <- strsContains(addrs, metadataIP)
+	}()
+
+	tryHarder := systemInfoSuggestsGCE()
+	if tryHarder {
+		res := <-resc
+		if res {
+			// The first strategy succeeded, so let's use it.
+			return true
+		}
+		// Wait for either the DNS or metadata server probe to
+		// contradict the other one and say we are running on
+		// GCE. Give it a lot of time to do so, since the system
+		// info already suggests we're running on a GCE BIOS.
+		timer := time.NewTimer(5 * time.Second)
+		defer timer.Stop()
+		select {
+		case res = <-resc:
+			return res
+		case <-timer.C:
+			// Too slow. Who knows what this system is.
+			return false
+		}
+	}
+
+	// There's no hint from the system info that we're running on
+	// GCE, so use the first probe's result as truth, whether it's
+	// true or false. The goal here is to optimize for speed for
+	// users who are NOT running on GCE. We can't assume that
+	// either a DNS lookup or an HTTP request to a blackholed IP
+	// address is fast. Worst case this should return when the
+	// metaClient's Transport.ResponseHeaderTimeout or
+	// Transport.Dial.Timeout fires (in two seconds).
+	return <-resc
+}
+
+// systemInfoSuggestsGCE reports whether the local system (without
+// doing network requests) suggests that we're running on GCE. If this
+// returns true, testOnGCE tries a bit harder to reach its metadata
+// server.
+func systemInfoSuggestsGCE() bool {
+	if runtime.GOOS != "linux" {
+		// We don't have any non-Linux clues available, at least yet.
+		return false
+	}
+	slurp, _ := ioutil.ReadFile("/sys/class/dmi/id/product_name")
+	name := strings.TrimSpace(string(slurp))
+	return name == "Google" || name == "Google Compute Engine"
+}
+
+// Subscribe calls Client.Subscribe on the default client.
+func Subscribe(suffix string, fn func(v string, ok bool) error) error {
+	return defaultClient.Subscribe(suffix, fn)
+}
+
+// Get calls Client.Get on the default client.
+func Get(suffix string) (string, error) { return defaultClient.Get(suffix) }
+
+// ProjectID returns the current instance's project ID string.
+func ProjectID() (string, error) { return defaultClient.ProjectID() }
+
+// NumericProjectID returns the current instance's numeric project ID.
+func NumericProjectID() (string, error) { return defaultClient.NumericProjectID() }
+
+// InternalIP returns the instance's primary internal IP address.
+func InternalIP() (string, error) { return defaultClient.InternalIP() }
+
+// ExternalIP returns the instance's primary external (public) IP address.
+func ExternalIP() (string, error) { return defaultClient.ExternalIP() }
+
+// Email calls Client.Email on the default client.
+func Email(serviceAccount string) (string, error) { return defaultClient.Email(serviceAccount) }
+
+// Hostname returns the instance's hostname. This will be of the form
+// "<instanceID>.c.<projID>.internal".
+func Hostname() (string, error) { return defaultClient.Hostname() }
+
+// InstanceTags returns the list of user-defined instance tags,
+// assigned when initially creating a GCE instance.
+func InstanceTags() ([]string, error) { return defaultClient.InstanceTags() }
+
+// InstanceID returns the current VM's numeric instance ID.
+func InstanceID() (string, error) { return defaultClient.InstanceID() }
+
+// InstanceName returns the current VM's instance ID string.
+func InstanceName() (string, error) { return defaultClient.InstanceName() }
+
+// Zone returns the current VM's zone, such as "us-central1-b".
+func Zone() (string, error) { return defaultClient.Zone() }
+
+// InstanceAttributes calls Client.InstanceAttributes on the default client.
+func InstanceAttributes() ([]string, error) { return defaultClient.InstanceAttributes() }
+
+// ProjectAttributes calls Client.ProjectAttributes on the default client.
+func ProjectAttributes() ([]string, error) { return defaultClient.ProjectAttributes() }
+
+// InstanceAttributeValue calls Client.InstanceAttributeValue on the default client.
+func InstanceAttributeValue(attr string) (string, error) {
+	return defaultClient.InstanceAttributeValue(attr)
+}
+
+// ProjectAttributeValue calls Client.ProjectAttributeValue on the default client.
+func ProjectAttributeValue(attr string) (string, error) {
+	return defaultClient.ProjectAttributeValue(attr)
+}
+
+// Scopes calls Client.Scopes on the default client.
+func Scopes(serviceAccount string) ([]string, error) { return defaultClient.Scopes(serviceAccount) }
+
+func strsContains(ss []string, s string) bool {
+	for _, v := range ss {
+		if v == s {
+			return true
+		}
+	}
+	return false
+}
+
+// A Client provides metadata.
+type Client struct {
+	hc *http.Client
+}
+
+// NewClient returns a Client that can be used to fetch metadata.
+// Returns the client that uses the specified http.Client for HTTP requests.
+// If nil is specified, returns the default client.
+func NewClient(c *http.Client) *Client {
+	if c == nil {
+		return defaultClient
+	}
+
+	return &Client{hc: c}
+}
+
+// getETag returns a value from the metadata service as well as the associated ETag.
+// This func is otherwise equivalent to Get.
+func (c *Client) getETag(suffix string) (value, etag string, err error) {
+	// Using a fixed IP makes it very difficult to spoof the metadata service in
+	// a container, which is an important use-case for local testing of cloud
+	// deployments. To enable spoofing of the metadata service, the environment
+	// variable GCE_METADATA_HOST is first inspected to decide where metadata
+	// requests shall go.
+	host := os.Getenv(metadataHostEnv)
+	if host == "" {
+		// Using 169.254.169.254 instead of "metadata" here because Go
+		// binaries built with the "netgo" tag and without cgo won't
+		// know the search suffix for "metadata" is
+		// ".google.internal", and this IP address is documented as
+		// being stable anyway.
+		host = metadataIP
+	}
+	suffix = strings.TrimLeft(suffix, "/")
+	u := "http://" + host + "/computeMetadata/v1/" + suffix
+	req, err := http.NewRequest("GET", u, nil)
+	if err != nil {
+		return "", "", err
+	}
+	req.Header.Set("Metadata-Flavor", "Google")
+	req.Header.Set("User-Agent", userAgent)
+	res, err := c.hc.Do(req)
+	if err != nil {
+		return "", "", err
+	}
+	defer res.Body.Close()
+	if res.StatusCode == http.StatusNotFound {
+		return "", "", NotDefinedError(suffix)
+	}
+	all, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return "", "", err
+	}
+	if res.StatusCode != 200 {
+		return "", "", &Error{Code: res.StatusCode, Message: string(all)}
+	}
+	return string(all), res.Header.Get("Etag"), nil
+}
+
+// Get returns a value from the metadata service.
+// The suffix is appended to "http://${GCE_METADATA_HOST}/computeMetadata/v1/".
+//
+// If the GCE_METADATA_HOST environment variable is not defined, a default of
+// 169.254.169.254 will be used instead.
+//
+// If the requested metadata is not defined, the returned error will
+// be of type NotDefinedError.
+func (c *Client) Get(suffix string) (string, error) {
+	val, _, err := c.getETag(suffix)
+	return val, err
+}
+
+func (c *Client) getTrimmed(suffix string) (s string, err error) {
+	s, err = c.Get(suffix)
+	s = strings.TrimSpace(s)
+	return
+}
+
+func (c *Client) lines(suffix string) ([]string, error) {
+	j, err := c.Get(suffix)
+	if err != nil {
+		return nil, err
+	}
+	s := strings.Split(strings.TrimSpace(j), "\n")
+	for i := range s {
+		s[i] = strings.TrimSpace(s[i])
+	}
+	return s, nil
+}
+
+// ProjectID returns the current instance's project ID string.
+func (c *Client) ProjectID() (string, error) { return projID.get(c) }
+
+// NumericProjectID returns the current instance's numeric project ID.
+func (c *Client) NumericProjectID() (string, error) { return projNum.get(c) }
+
+// InstanceID returns the current VM's numeric instance ID.
+func (c *Client) InstanceID() (string, error) { return instID.get(c) }
+
+// InternalIP returns the instance's primary internal IP address.
+func (c *Client) InternalIP() (string, error) {
+	return c.getTrimmed("instance/network-interfaces/0/ip")
+}
+
+// Email returns the email address associated with the service account.
+// The account may be empty or the string "default" to use the instance's
+// main account.
+func (c *Client) Email(serviceAccount string) (string, error) {
+	if serviceAccount == "" {
+		serviceAccount = "default"
+	}
+	return c.getTrimmed("instance/service-accounts/" + serviceAccount + "/email")
+}
+
+// ExternalIP returns the instance's primary external (public) IP address.
+func (c *Client) ExternalIP() (string, error) {
+	return c.getTrimmed("instance/network-interfaces/0/access-configs/0/external-ip")
+}
+
+// Hostname returns the instance's hostname. This will be of the form
+// "<instanceID>.c.<projID>.internal".
+func (c *Client) Hostname() (string, error) {
+	return c.getTrimmed("instance/hostname")
+}
+
+// InstanceTags returns the list of user-defined instance tags,
+// assigned when initially creating a GCE instance.
+func (c *Client) InstanceTags() ([]string, error) {
+	var s []string
+	j, err := c.Get("instance/tags")
+	if err != nil {
+		return nil, err
+	}
+	if err := json.NewDecoder(strings.NewReader(j)).Decode(&s); err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+// InstanceName returns the current VM's instance ID string.
+func (c *Client) InstanceName() (string, error) {
+	return c.getTrimmed("instance/name")
+}
+
+// Zone returns the current VM's zone, such as "us-central1-b".
+func (c *Client) Zone() (string, error) {
+	zone, err := c.getTrimmed("instance/zone")
+	// zone is of the form "projects/<projNum>/zones/<zoneName>".
+	if err != nil {
+		return "", err
+	}
+	return zone[strings.LastIndex(zone, "/")+1:], nil
+}
+
+// InstanceAttributes returns the list of user-defined attributes,
+// assigned when initially creating a GCE VM instance. The value of an
+// attribute can be obtained with InstanceAttributeValue.
+func (c *Client) InstanceAttributes() ([]string, error) { return c.lines("instance/attributes/") }
+
+// ProjectAttributes returns the list of user-defined attributes
+// applying to the project as a whole, not just this VM.  The value of
+// an attribute can be obtained with ProjectAttributeValue.
+func (c *Client) ProjectAttributes() ([]string, error) { return c.lines("project/attributes/") }
+
+// InstanceAttributeValue returns the value of the provided VM
+// instance attribute.
+//
+// If the requested attribute is not defined, the returned error will
+// be of type NotDefinedError.
+//
+// InstanceAttributeValue may return ("", nil) if the attribute was
+// defined to be the empty string.
+func (c *Client) InstanceAttributeValue(attr string) (string, error) {
+	return c.Get("instance/attributes/" + attr)
+}
+
+// ProjectAttributeValue returns the value of the provided
+// project attribute.
+//
+// If the requested attribute is not defined, the returned error will
+// be of type NotDefinedError.
+//
+// ProjectAttributeValue may return ("", nil) if the attribute was
+// defined to be the empty string.
+func (c *Client) ProjectAttributeValue(attr string) (string, error) {
+	return c.Get("project/attributes/" + attr)
+}
+
+// Scopes returns the service account scopes for the given account.
+// The account may be empty or the string "default" to use the instance's
+// main account.
+func (c *Client) Scopes(serviceAccount string) ([]string, error) {
+	if serviceAccount == "" {
+		serviceAccount = "default"
+	}
+	return c.lines("instance/service-accounts/" + serviceAccount + "/scopes")
+}
+
+// Subscribe subscribes to a value from the metadata service.
+// The suffix is appended to "http://${GCE_METADATA_HOST}/computeMetadata/v1/".
+// The suffix may contain query parameters.
+//
+// Subscribe calls fn with the latest metadata value indicated by the provided
+// suffix. If the metadata value is deleted, fn is called with the empty string
+// and ok false. Subscribe blocks until fn returns a non-nil error or the value
+// is deleted. Subscribe returns the error value returned from the last call to
+// fn, which may be nil when ok == false.
+func (c *Client) Subscribe(suffix string, fn func(v string, ok bool) error) error {
+	const failedSubscribeSleep = time.Second * 5
+
+	// First check to see if the metadata value exists at all.
+	val, lastETag, err := c.getETag(suffix)
+	if err != nil {
+		return err
+	}
+
+	if err := fn(val, true); err != nil {
+		return err
+	}
+
+	ok := true
+	if strings.ContainsRune(suffix, '?') {
+		suffix += "&wait_for_change=true&last_etag="
+	} else {
+		suffix += "?wait_for_change=true&last_etag="
+	}
+	for {
+		val, etag, err := c.getETag(suffix + url.QueryEscape(lastETag))
+		if err != nil {
+			if _, deleted := err.(NotDefinedError); !deleted {
+				time.Sleep(failedSubscribeSleep)
+				continue // Retry on other errors.
+			}
+			ok = false
+		}
+		lastETag = etag
+
+		if err := fn(val, ok); err != nil || !ok {
+			return err
+		}
+	}
+}
+
+// Error contains an error response from the server.
+type Error struct {
+	// Code is the HTTP response status code.
+	Code int
+	// Message is the server response message.
+	Message string
+}
+
+func (e *Error) Error() string {
+	return fmt.Sprintf("compute: Received %d `%s`", e.Code, e.Message)
+}

vendor/github.com/TwinProduction/gocache/.gitattributes

@@ -0,0 +1 @@
+* text=lf

vendor/github.com/TwinProduction/gocache/.gitignore

@@ -0,0 +1 @@
+.idea

vendor/github.com/TwinProduction/gocache/Dockerfile

@@ -0,0 +1,20 @@
+# Build the go application into a binary
+FROM golang:alpine as builder
+WORKDIR /app
+ADD . ./
+RUN CGO_ENABLED=0 GOOS=linux go build -mod vendor -a -installsuffix cgo -o bin/gocache-server ./gocacheserver/main
+RUN apk --update add --no-cache ca-certificates
+
+FROM scratch
+ENV APP_HOME=/app
+ENV APP_DATA=/app/data
+ENV PORT=6379
+ENV MAX_CACHE_SIZE=100000
+ENV MAX_MEMORY_USAGE=0
+ENV AUTOSAVE="false"
+VOLUME ${APP_DATA}
+WORKDIR ${APP_HOME}
+COPY --from=builder /app/bin/gocache-server ./bin/gocache-server
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+EXPOSE ${PORT}
+ENTRYPOINT ["/app/bin/gocache-server"]

vendor/github.com/TwinProduction/gocache/LICENSE.md

@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) 2020 TwinProduction
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/TwinProduction/gocache/Makefile

@@ -0,0 +1,24 @@
+db: docker-build
+dr: docker-run
+drmem: docker-run-max-memory-usage
+
+docker-build:
+	docker build --tag=gocache-server .
+
+docker-run:
+	docker run -p 6666:6379 -e AUTOSAVE=true -e MAX_CACHE_SIZE=0 --name gocache-server -d gocache-server
+
+docker-run-max-memory-usage:
+	docker run -p 6666:6379 -e AUTOSAVE=true -e MAX_CACHE_SIZE=0 -e MAX_MEMORY_USAGE=524288000 --name gocache-server -d gocache-server
+
+run:
+	PORT=6666 go run gocacheserver/main/server.go
+
+start-redis:
+	docker run -p 6379:6379 --name redis -d redis
+
+redis-benchmark:
+	redis-benchmark -p 6666 -t set,get -n 10000000 -r 200000 -q -P 512 -c 512
+
+memtier-benchmark:
+	memtier_benchmark --port 6666 --hide-histogram --key-maximum 100000 --ratio 1:1 --expiry-range 1-100 --key-pattern R:R --randomize -n 100000

vendor/github.com/TwinProduction/gocache/README.md

@@ -0,0 +1,452 @@
+# gocache
+
+![build](https://github.com/TwinProduction/gocache/workflows/build/badge.svg?branch=master) 
+[![Go Report Card](https://goreportcard.com/badge/github.com/TwinProduction/gocache)](https://goreportcard.com/report/github.com/TwinProduction/gocache)
+[![codecov](https://codecov.io/gh/TwinProduction/gocache/branch/master/graph/badge.svg)](https://codecov.io/gh/TwinProduction/gocache)
+[![Go version](https://img.shields.io/github/go-mod/go-version/TwinProduction/gocache.svg)](https://github.com/TwinProduction/gocache)
+[![Go Reference](https://pkg.go.dev/badge/github.com/TwinProduction/gocache.svg)](https://pkg.go.dev/github.com/TwinProduction/gocache)
+
+gocache is an easy-to-use, high-performance, lightweight and thread-safe (goroutine-safe) in-memory key-value cache 
+with support for LRU and FIFO eviction policies as well as expiration, bulk operations and even persistence to file.
+
+
+## Table of Contents
+
+- [Features](#features)
+- [Usage](#usage)
+  - [Initializing the cache](#initializing-the-cache)
+  - [Functions](#functions)
+  - [Examples](#examples)
+    - [Creating or updating an entry](#creating-or-updating-an-entry)
+    - [Getting an entry](#getting-an-entry)
+    - [Deleting an entry](#deleting-an-entry)
+    - [Complex example](#complex-example)
+- [Persistence](#persistence)
+  - [Limitations](#limitations)
+- [Eviction](#eviction)
+  - [MaxSize](#maxsize)
+  - [MaxMemoryUsage](#maxmemoryusage)
+- [Expiration](#expiration)
+- [Server](#server)
+- [Running the server with Docker](#running-the-server-with-docker)
+- [Performance](#performance)
+  - [Summary](#summary)
+  - [Results](#results)
+- [FAQ](#faq)
+  - [Why does the memory usage not go down?](#why-does-the-memory-usage-not-go-down)
+
+
+## Features
+gocache supports the following cache eviction policies: 
+- First in first out (FIFO)
+- Least recently used (LRU)
+
+It also supports cache entry TTL, which is both active and passive. Active expiration means that if you attempt 
+to retrieve a cache key that has already expired, it will delete it on the spot and the behavior will be as if
+the cache key didn't exist. As for passive expiration, there's a background task that will take care of deleting
+expired keys.
+
+It also includes what you'd expect from a cache, like bulk operations, persistence and patterns.
+
+While meant to be used as a library, there's a Redis-compatible cache server included. 
+See the [Server](#server) section. 
+It may also serve as a good reference to use in order to implement gocache in your own applications.
+
+
+## Usage
+```
+go get -u github.com/TwinProduction/gocache
+```
+
+### Initializing the cache
+```go
+cache := gocache.NewCache().WithMaxSize(1000).WithEvictionPolicy(gocache.LeastRecentlyUsed)
+```
+
+If you're planning on using expiration (`SetWithTTL` or `Expire`) and you want expired entries to be automatically deleted 
+in the background, make sure to start the janitor when you instantiate the cache:
+
+```go
+cache.StartJanitor()
+```
+
+### Functions
+| Function                          | Description |
+| --------------------------------- | ----------- |
+| WithMaxSize                       | Sets the max size of the cache. `gocache.NoMaxSize` means there is no limit. If not set, the default max size is `gocache.DefaultMaxSize`.
+| WithMaxMemoryUsage                | Sets the max memory usage of the cache. `gocache.NoMaxMemoryUsage` means there is no limit. The default behavior is to not evict based on memory usage.
+| WithEvictionPolicy                | Sets the eviction algorithm to be used when the cache reaches the max size. If not set, the default eviction policy is `gocache.FirstInFirstOut` (FIFO).
+| WithForceNilInterfaceOnNilPointer | Configures whether values with a nil pointer passed to write functions should be forcefully set to nil. Defaults to true.
+| StartJanitor                      | Starts the janitor, which is in charge of deleting expired cache entries in the background.
+| StopJanitor                       | Stops the janitor.
+| Set                               | Same as `SetWithTTL`, but with no expiration (`gocache.NoExpiration`)
+| SetAll                            | Same as `Set`, but in bulk
+| SetWithTTL                        | Creates or updates a cache entry with the given key, value and expiration time. If the max size after the aforementioned operation is above the configured max size, the tail will be evicted. Depending on the eviction policy, the tail is defined as the oldest 
+| Get                               | Gets a cache entry by its key.
+| GetByKeys                         | Gets a map of entries by their keys. The resulting map will contain all keys, even if some of the keys in the slice passed as parameter were not present in the cache.  
+| GetAll                            | Gets all cache entries.
+| GetKeysByPattern                  | Retrieves a slice of keys that matches a given pattern.
+| Delete                            | Removes a key from the cache.
+| DeleteAll                         | Removes multiple keys from the cache.
+| Count                             | Gets the size of the cache. This includes cache keys which may have already expired, but have not been removed yet.
+| Clear                             | Wipes the cache.
+| TTL                               | Gets the time until a cache key expires. 
+| Expire                            | Sets the expiration time of an existing cache key.
+| SaveToFile                        | Stores the content of the cache to a file so that it can be read using `ReadFromFile`. See [persistence](#persistence).
+| ReadFromFile                      | Populates the cache using a file created using `SaveToFile`. See [persistence](#persistence).
+
+For further documentation, please refer to [Go Reference](https://pkg.go.dev/github.com/TwinProduction/gocache)
+
+
+### Examples
+
+#### Creating or updating an entry
+```go
+cache.Set("key", "value") 
+cache.Set("key", 1)
+cache.Set("key", struct{ Text string }{Test: "value"})
+cache.SetWithTTL("key", []byte("value"), 24*time.Hour)
+```
+
+#### Getting an entry
+```go
+value, exists := cache.Get("key")
+```
+You can also get multiple entries by using `cache.GetByKeys([]string{"key1", "key2"})`
+
+#### Deleting an entry
+```go
+cache.Delete("key")
+```
+You can also delete multiple entries by using `cache.DeleteAll([]string{"key1", "key2"})`
+
+#### Complex example
+```go
+package main
+
+import (
+	"fmt"
+	"time"
+
+    "github.com/TwinProduction/gocache"
+)
+
+func main() {
+	cache := gocache.NewCache().WithEvictionPolicy(gocache.LeastRecentlyUsed).WithMaxSize(10000)
+	cache.StartJanitor() // Passively manages expired entries
+
+	cache.Set("key", "value")
+	cache.SetWithTTL("key-with-ttl", "value", 60*time.Minute)
+	cache.SetAll(map[string]interface{}{"k1": "v1", "k2": "v2", "k3": "v3"})
+
+	value, exists := cache.Get("key")
+	fmt.Printf("[Get] key=key; value=%s; exists=%v\n", value, exists)
+	for key, value := range cache.GetByKeys([]string{"k1", "k2", "k3"}) {
+		fmt.Printf("[GetByKeys] key=%s; value=%s\n", key, value)
+	}
+	for _, key := range cache.GetKeysByPattern("key*", 0) {
+		fmt.Printf("[GetKeysByPattern] key=%s\n", key)
+	}
+
+	fmt.Println("Cache size before persisting cache to file:", cache.Count())
+	err := cache.SaveToFile("cache.bak")
+	if err != nil {
+		panic(fmt.Sprintf("failed to persist cache to file: %s", err.Error()))
+	}
+
+	cache.Expire("key", time.Hour)
+	time.Sleep(500*time.Millisecond)
+	timeUntilExpiration, _ := cache.TTL("key")
+	fmt.Println("Number of minutes before 'key' expires:", int(timeUntilExpiration.Seconds()))
+
+	cache.Delete("key")
+	cache.DeleteAll([]string{"k1", "k2", "k3"})
+
+	fmt.Println("Cache size before restoring cache from file:", cache.Count())
+	_, err = cache.ReadFromFile("cache.bak")
+	if err != nil {
+		panic(fmt.Sprintf("failed to restore cache from file: %s", err.Error()))
+	}
+
+	fmt.Println("Cache size after restoring cache from file:", cache.Count())
+	cache.Clear()
+	fmt.Println("Cache size after clearing the cache:", cache.Count())
+}
+```
+
+<details>
+  <summary>Output</summary>
+
+```
+[Get] key=key; value=value; exists=true
+[GetByKeys] key=k2; value=v2
+[GetByKeys] key=k3; value=v3
+[GetByKeys] key=k1; value=v1
+[GetKeysByPattern] key=key
+[GetKeysByPattern] key=key-with-ttl
+Cache size before persisting cache to file: 5
+Number of minutes before 'key' expires: 3599
+Cache size before restoring cache from file: 1
+Cache size after restoring cache from file: 5
+Cache size after clearing the cache: 0
+```
+</details>
+
+
+## Persistence
+While gocache is an in-memory cache, you can still save the content of the cache in a file
+and vice versa.
+
+To save the content of the cache to a file:
+```go
+err := cache.SaveToFile(TestCacheFile)
+```
+
+To retrieve the content of the cache from a file:
+```go
+numberOfEntriesEvicted, err := newCache.ReadFromFile(TestCacheFile)
+```
+The `numberOfEntriesEvicted` will be non-zero only if the number of entries 
+in the file is higher than the cache's configured `MaxSize`.
+
+### Limitations
+While you can cache structs in memory out of the box, persisting structs to a file requires you to 
+**register the custom interfaces that your application uses with the `gob` package**.
+
+```go
+type YourCustomStruct struct {
+	A string
+	B int
+}
+
+// ...
+cache.Set("key", YourCustomStruct{A: "test", B: 123})
+```
+To persist your custom struct properly:
+```go
+gob.Register(YourCustomStruct{})
+cache.SaveToFile("gocache.bak")
+``` 
+The same applies for restoring the cache from a file:
+```go
+cache := NewCache()
+gob.Register(YourCustomStruct{})
+cache.ReadFromFile(TestCacheFile)
+value, _ := cache.Get("key")
+fmt.Println(value.(YourCustomStruct))
+```
+You only need to persist the struct once, so adding the following function in a file would suffice:
+```go
+func init() {
+    gob.Register(YourCustomStruct{})
+}
+```
+
+Failure to register your custom structs will prevent gocache from persisting and/or parsing the value of each keys that 
+use said custom structs.
+
+That being said, assuming that you're using gocache as a cache, this shouldn't create any bugs on your end, because
+every key that cannot be parsed are not populated into the cache by `ReadFromFile`.
+
+In other words, if you're falling back to a database or something similar when the cache doesn't have the key requested,
+you'll be fine.
+
+
+## Eviction
+
+### MaxSize
+Eviction by MaxSize is the default behavior, and is also the most efficient.
+
+The code below will create a cache that has a maximum size of 1000:
+```go
+cache := gocache.NewCache().WithMaxSize(1000)
+```
+This means that whenever an operation causes the total size of the cache to go above 1000, the tail will be evicted.
+
+### MaxMemoryUsage
+Eviction by MaxMemoryUsage is **disabled by default**, and is in alpha.
+
+The code below will create a cache that has a maximum memory usage of 50MB:
+```go
+cache := gocache.NewCache().WithMaxSize(0).WithMaxMemoryUsage(50*gocache.Megabyte)
+```
+This means that whenever an operation causes the total memory usage of the cache to go above 50MB, one or more tails
+will be evicted.
+
+Unlike evictions caused by reaching the MaxSize, evictions triggered by MaxMemoryUsage may lead to multiple entries
+being evicted in a row. The reason for this is that if, for instance, you had 100 entries of 0.1MB each and you suddenly added 
+a single entry of 10MB, 100 entries would need to be evicted to make enough space for that new big entry.
+
+It's very important to keep in mind that eviction by MaxMemoryUsage is approximate.
+
+**The only memory taken into consideration is the size of the cache, not the size of the entire application.**
+If you pass along 100MB worth of data in a matter of seconds, even though the cache's memory usage will remain
+under 50MB (or whatever you configure the MaxMemoryUsage to), the memory footprint generated by that 100MB will 
+still exist until the next GC cycle.
+
+As previously mentioned, this is a work in progress, and here's a list of the things you should keep in mind:
+- The memory usage of structs are a gross estimation and may not reflect the actual memory usage.
+- Native types (string, int, bool, []byte, etc.) are the most accurate for calculating the memory usage.
+- Adding an entry bigger than the configured MaxMemoryUsage will work, but it will evict all other entries.
+
+
+## Expiration
+There are two ways that the deletion of expired keys can take place:
+- Active
+- Passive
+
+**Active deletion of expired keys** happens when an attempt is made to access the value of a cache entry that expired. 
+`Get`, `GetByKeys` and `GetAll` are the only functions that can trigger active deletion of expired keys.
+
+**Passive deletion of expired keys** runs in the background and is managed by the janitor. 
+If you do not start the janitor, there will be no passive deletion of expired keys.
+
+
+## Server
+For the sake of convenience, a ready-to-go cache server is available 
+through the `gocacheserver` package. 
+
+The reason why the server is in a different package is because `gocache` does not use 
+any external dependencies, but rather than re-inventing the wheel, the server 
+implementation uses redcon, which is a Redis server framework for Go.
+
+That way, those who desire to use gocache without the server will not add any extra dependencies
+as long as they don't import the `gocacheserver` package. 
+
+```go
+package main
+
+import (
+	"github.com/TwinProduction/gocache"
+	"github.com/TwinProduction/gocache/gocacheserver"
+)
+
+func main() {
+	cache := gocache.NewCache().WithEvictionPolicy(gocache.LeastRecentlyUsed).WithMaxSize(100000)
+	server := gocacheserver.NewServer(cache)
+	server.Start()
+}
+```
+
+Any Redis client should be able to interact with the server, though only the following instructions are supported:
+- [X] GET
+- [X] SET
+- [X] DEL
+- [X] PING
+- [X] QUIT
+- [X] INFO
+- [X] EXPIRE
+- [X] SETEX
+- [X] TTL
+- [X] FLUSHDB
+- [X] EXISTS
+- [X] ECHO
+- [X] MGET
+- [X] MSET
+- [X] SCAN (kind of - cursor is not currently supported)
+- [ ] KEYS
+
+
+## Running the server with Docker
+[![Docker pulls](https://img.shields.io/docker/pulls/twinproduction/gocache-server.svg)](https://cloud.docker.com/repository/docker/twinproduction/gocache-server)
+
+To build it locally, refer to the Makefile's `docker-build` and `docker-run` steps.
+
+Note that the server version of gocache is still under development.
+
+```
+docker run --name gocache-server -p 6379:6379 twinproduction/gocache-server
+```
+
+
+## Performance
+
+### Summary
+- **Set**: Both map and gocache have the same performance.
+- **Get**: Map is faster than gocache.
+
+This is because gocache keeps track of the head and the tail for eviction and expiration/TTL. 
+
+Ultimately, the difference is negligible. 
+
+We could add a way to disable eviction or disable expiration altogether just to match the map's performance, 
+but if you're looking into using a library like gocache, odds are, you want more than just a map.
+
+
+### Results
+| key    | value    |
+|:------ |:-------- |
+| goos   | windows  |
+| goarch | amd64    |
+| cpu    | i7-9700K |
+| mem    | 32G DDR4 |
+
+```
+BenchmarkMap_Get-8                                                         	95936680	      26.3 ns/op
+BenchmarkMap_SetSmallValue-8                                               	 7738132	       424 ns/op
+BenchmarkMap_SetMediumValue-8                                              	 7766346	       424 ns/op
+BenchmarkMap_SetLargeValue-8                                               	 7947063	       435 ns/op
+BenchmarkCache_Get-8                                                       	54549049	      45.7 ns/op
+BenchmarkCache_SetSmallValue-8                                             	35225013	      69.2 ns/op
+BenchmarkCache_SetMediumValue-8                                            	 5952064	       412 ns/op
+BenchmarkCache_SetLargeValue-8                                             	 5969121	       411 ns/op
+BenchmarkCache_GetUsingLRU-8                                               	54545949	      45.6 ns/op
+BenchmarkCache_SetSmallValueUsingLRU-8                                     	 5909504	       419 ns/op
+BenchmarkCache_SetMediumValueUsingLRU-8                                    	 5910885	       418 ns/op
+BenchmarkCache_SetLargeValueUsingLRU-8                                     	 5867544	       419 ns/op
+BenchmarkCache_SetSmallValueWhenUsingMaxMemoryUsage-8                      	 5477178	       462 ns/op
+BenchmarkCache_SetMediumValueWhenUsingMaxMemoryUsage-8                     	 5417595	       475 ns/op
+BenchmarkCache_SetLargeValueWhenUsingMaxMemoryUsage-8                      	 5215263	       479 ns/op
+BenchmarkCache_SetSmallValueWithMaxSize10-8                                	10115574	       236 ns/op
+BenchmarkCache_SetMediumValueWithMaxSize10-8                               	10242792	       241 ns/op
+BenchmarkCache_SetLargeValueWithMaxSize10-8                                	10201894	       241 ns/op
+BenchmarkCache_SetSmallValueWithMaxSize1000-8                              	 9637113	       253 ns/op
+BenchmarkCache_SetMediumValueWithMaxSize1000-8                             	 9635175	       253 ns/op
+BenchmarkCache_SetLargeValueWithMaxSize1000-8                              	 9598982	       260 ns/op
+BenchmarkCache_SetSmallValueWithMaxSize100000-8                            	 7642584	       337 ns/op
+BenchmarkCache_SetMediumValueWithMaxSize100000-8                           	 7407571	       344 ns/op
+BenchmarkCache_SetLargeValueWithMaxSize100000-8                            	 7071360	       345 ns/op
+BenchmarkCache_SetSmallValueWithMaxSize100000AndLRU-8                      	 7544194	       332 ns/op
+BenchmarkCache_SetMediumValueWithMaxSize100000AndLRU-8                     	 7667004	       344 ns/op
+BenchmarkCache_SetLargeValueWithMaxSize100000AndLRU-8                      	 7357642	       338 ns/op
+BenchmarkCache_GetAndSetMultipleConcurrently-8                             	 1442306	      1684 ns/op
+BenchmarkCache_GetAndSetConcurrentlyWithRandomKeysAndLRU-8                 	 5117271	       477 ns/op
+BenchmarkCache_GetAndSetConcurrentlyWithRandomKeysAndFIFO-8                	 5228412	       475 ns/op
+BenchmarkCache_GetAndSetConcurrentlyWithRandomKeysAndNoEvictionAndLRU-8    	 5139195	       529 ns/op
+BenchmarkCache_GetAndSetConcurrentlyWithRandomKeysAndNoEvictionAndFIFO-8   	 5251639	       511 ns/op
+BenchmarkCache_GetAndSetConcurrentlyWithFrequentEvictionsAndLRU-8          	 7384626	       334 ns/op
+BenchmarkCache_GetAndSetConcurrentlyWithFrequentEvictionsAndFIFO-8         	 7361985	       332 ns/op
+BenchmarkCache_GetConcurrentlyWithLRU-8                                    	 3370784	       726 ns/op
+BenchmarkCache_GetConcurrentlyWithFIFO-8                                   	 3749994	       681 ns/op
+BenchmarkCache_GetKeysThatDoNotExistConcurrently-8                         	17647344	       143 ns/op
+```
+
+
+## FAQ
+
+### Why does the memory usage not go down?
+
+> **NOTE**: As of Go 1.16, this will no longer apply. See [golang/go#42330](https://github.com/golang/go/issues/42330)
+
+By default, Go uses `MADV_FREE` if the kernel supports it to release memory, which is significantly more efficient 
+than using `MADV_DONTNEED`. Unfortunately, this means that RSS doesn't go down unless the OS actually needs the 
+memory. 
+
+Technically, the memory _is_ available to the kernel, even if it shows a high memory usage, but the OS will only
+use that memory if it needs to. In the case that the OS does need the freed memory, the RSS will go down and you'll
+notice the memory usage lowering.
+
+[reference](https://github.com/golang/go/issues/33376#issuecomment-666455792)
+
+You can reproduce this by following the steps below:
+- Start gocacheserver
+- Note the memory usage
+- Create 500k keys
+- Note the memory usage
+- Flush the cache
+- Note that the memory usage has not decreased, despite the cache being empty.
+
+**Substituting gocache for a normal map will yield the same result.**
+
+If the released memory still appearing as used is a problem for you, 
+you can set the environment variable `GODEBUG` to `madvdontneed=1`.

vendor/github.com/TwinProduction/gocache/entry.go

@@ -0,0 +1,108 @@
+package gocache
+
+import (
+	"fmt"
+	"time"
+	"unsafe"
+)
+
+// Entry is a cache entry
+type Entry struct {
+	// Key is the name of the cache entry
+	Key string
+
+	// Value is the value of the cache entry
+	Value interface{}
+
+	// RelevantTimestamp is the variable used to store either:
+	// - creation timestamp, if the Cache's EvictionPolicy is FirstInFirstOut
+	// - last access timestamp, if the Cache's EvictionPolicy is LeastRecentlyUsed
+	//
+	// Note that updating an existing entry will also update this value
+	RelevantTimestamp time.Time
+
+	// Expiration is the unix time in nanoseconds at which the entry will expire (-1 means no expiration)
+	Expiration int64
+
+	next     *Entry
+	previous *Entry
+}
+
+// Accessed updates the Entry's RelevantTimestamp to now
+func (entry *Entry) Accessed() {
+	entry.RelevantTimestamp = time.Now()
+}
+
+// Expired returns whether the Entry has expired
+func (entry Entry) Expired() bool {
+	if entry.Expiration > 0 {
+		if time.Now().UnixNano() > entry.Expiration {
+			return true
+		}
+	}
+	return false
+}
+
+// SizeInBytes returns the size of an entry in bytes, approximately.
+func (entry *Entry) SizeInBytes() int {
+	return toBytes(entry.Key) + toBytes(entry.Value) + 32
+}
+
+func toBytes(value interface{}) int {
+	switch value.(type) {
+	case string:
+		return int(unsafe.Sizeof(value)) + len(value.(string))
+	case int8, uint8, bool:
+		return int(unsafe.Sizeof(value)) + 1
+	case int16, uint16:
+		return int(unsafe.Sizeof(value)) + 2
+	case int32, uint32, float32, complex64:
+		return int(unsafe.Sizeof(value)) + 4
+	case int64, uint64, int, uint, float64, complex128:
+		return int(unsafe.Sizeof(value)) + 8
+	case []interface{}:
+		size := 0
+		for _, v := range value.([]interface{}) {
+			size += toBytes(v)
+		}
+		return int(unsafe.Sizeof(value)) + size
+	case []string:
+		size := 0
+		for _, v := range value.([]string) {
+			size += toBytes(v)
+		}
+		return int(unsafe.Sizeof(value)) + size
+	case []int8:
+		return int(unsafe.Sizeof(value)) + len(value.([]int8))
+	case []uint8:
+		return int(unsafe.Sizeof(value)) + len(value.([]uint8))
+	case []bool:
+		return int(unsafe.Sizeof(value)) + len(value.([]bool))
+	case []int16:
+		return int(unsafe.Sizeof(value)) + (len(value.([]int16)) * 2)
+	case []uint16:
+		return int(unsafe.Sizeof(value)) + (len(value.([]uint16)) * 2)
+	case []int32:
+		return int(unsafe.Sizeof(value)) + (len(value.([]int32)) * 4)
+	case []uint32:
+		return int(unsafe.Sizeof(value)) + (len(value.([]uint32)) * 4)
+	case []float32:
+		return int(unsafe.Sizeof(value)) + (len(value.([]float32)) * 4)
+	case []complex64:
+		return int(unsafe.Sizeof(value)) + (len(value.([]complex64)) * 4)
+	case []int64:
+		return int(unsafe.Sizeof(value)) + (len(value.([]int64)) * 8)
+	case []uint64:
+		return int(unsafe.Sizeof(value)) + (len(value.([]uint64)) * 8)
+	case []int:
+		return int(unsafe.Sizeof(value)) + (len(value.([]int)) * 8)
+	case []uint:
+		return int(unsafe.Sizeof(value)) + (len(value.([]uint)) * 8)
+	case []float64:
+		return int(unsafe.Sizeof(value)) + (len(value.([]float64)) * 8)
+	case []complex128:
+		return int(unsafe.Sizeof(value)) + (len(value.([]complex128)) * 8)
+	default:
+		return int(unsafe.Sizeof(value)) + len(fmt.Sprintf("%v", value))
+	}
+}

vendor/github.com/TwinProduction/gocache/go.mod

@@ -0,0 +1,11 @@
+module github.com/TwinProduction/gocache
+
+go 1.15
+
+require (
+	github.com/boltdb/bolt v1.3.1
+	github.com/go-redis/redis v6.15.9+incompatible
+	github.com/onsi/ginkgo v1.14.1 // indirect
+	github.com/onsi/gomega v1.10.2 // indirect
+	github.com/tidwall/redcon v1.3.2
+)

vendor/github.com/TwinProduction/gocache/go.sum

@@ -0,0 +1,66 @@
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+github.com/go-redis/redis v6.15.9+incompatible/go.mod h1:NAIEuMOZ/fxfXJIrKDQDz8wamY7mA7PouImQ2Jvg6kA=
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vendor/github.com/TwinProduction/gocache/gocache.go

@@ -0,0 +1,559 @@
+package gocache
+
+import (
+	"errors"
+	"reflect"
+	"sync"
+	"time"
+)
+
+var (
+	Debug = false
+)
+
+const (
+	// NoMaxSize means that the cache has no maximum number of entries in the cache
+	// Setting Cache.maxSize to this value also means there will be no eviction
+	NoMaxSize = 0
+
+	// NoMaxMemoryUsage means that the cache has no maximum number of entries in the cache
+	NoMaxMemoryUsage = 0
+
+	// DefaultMaxSize is the max size set if no max size is specified
+	DefaultMaxSize = 100000
+
+	// NoExpiration is the value that must be used as TTL to specify that the given key should never expire
+	NoExpiration = -1
+
+	Kilobyte = 1024
+	Megabyte = 1024 * Kilobyte
+	Gigabyte = 1024 * Megabyte
+)
+
+var (
+	ErrKeyDoesNotExist       = errors.New("key does not exist")
+	ErrKeyHasNoExpiration    = errors.New("key has no expiration")
+	ErrJanitorAlreadyRunning = errors.New("janitor is already running")
+)
+
+// Cache is the core struct of gocache which contains the data as well as all relevant configuration fields
+type Cache struct {
+	// maxSize is the maximum amount of entries that can be in the cache at any given time
+	// By default, this is set to DefaultMaxSize
+	maxSize int
+
+	// maxMemoryUsage is the maximum amount of memory that can be taken up by the cache at any time
+	// By default, this is set to NoMaxMemoryUsage, meaning that the default behavior is to not evict
+	// based on maximum memory usage
+	maxMemoryUsage int
+
+	// evictionPolicy is the eviction policy
+	evictionPolicy EvictionPolicy
+
+	// stats is the object that contains cache statistics/metrics
+	stats *Statistics
+
+	// entries is the content of the cache
+	entries map[string]*Entry
+
+	// mutex is the lock for making concurrent operations on the cache
+	mutex sync.RWMutex
+
+	// head is the cache entry at the head of the cache
+	head *Entry
+
+	// tail is the last cache node and also the next entry that will be evicted
+	tail *Entry
+
+	// stopJanitor is the channel used to stop the janitor
+	stopJanitor chan bool
+
+	// memoryUsage is the approximate memory usage of the cache (dataset only) in bytes
+	memoryUsage int
+
+	// forceNilInterfaceOnNilPointer determines whether all Set-like functions should set a value as nil if the
+	// interface passed has a nil value but not a nil type.
+	//
+	// By default, interfaces are only nil when both their type and value is nil.
+	// This means that when you pass a pointer to a nil value, the type of the interface
+	// will still show as nil, which means that if you don't cast the interface after
+	// retrieving it, a nil check will return that the value is not false.
+	forceNilInterfaceOnNilPointer bool
+}
+
+// MaxSize returns the maximum amount of keys that can be present in the cache before
+// new entries trigger the eviction of the tail
+func (cache *Cache) MaxSize() int {
+	return cache.maxSize
+}
+
+// MaxMemoryUsage returns the configured maxMemoryUsage of the cache
+func (cache *Cache) MaxMemoryUsage() int {
+	return cache.maxMemoryUsage
+}
+
+// EvictionPolicy returns the EvictionPolicy of the Cache
+func (cache *Cache) EvictionPolicy() EvictionPolicy {
+	return cache.evictionPolicy
+}
+
+// Stats returns statistics from the cache
+func (cache *Cache) Stats() Statistics {
+	cache.mutex.RLock()
+	stats := Statistics{
+		EvictedKeys: cache.stats.EvictedKeys,
+		ExpiredKeys: cache.stats.ExpiredKeys,
+		Hits:        cache.stats.Hits,
+		Misses:      cache.stats.Misses,
+	}
+	cache.mutex.RUnlock()
+	return stats
+}
+
+// MemoryUsage returns the current memory usage of the cache's dataset in bytes
+// If MaxMemoryUsage is set to NoMaxMemoryUsage, this will return 0
+func (cache *Cache) MemoryUsage() int {
+	return cache.memoryUsage
+}
+
+// WithMaxSize sets the maximum amount of entries that can be in the cache at any given time
+// A maxSize of 0 or less means infinite
+func (cache *Cache) WithMaxSize(maxSize int) *Cache {
+	if maxSize < 0 {
+		maxSize = NoMaxSize
+	}
+	if maxSize != NoMaxSize && cache.Count() == 0 {
+		cache.entries = make(map[string]*Entry, maxSize)
+	}
+	cache.maxSize = maxSize
+	return cache
+}
+
+// WithMaxMemoryUsage sets the maximum amount of memory that can be used by the cache at any given time
+//
+// NOTE: This is approximate.
+//
+// Setting this to NoMaxMemoryUsage will disable eviction by memory usage
+func (cache *Cache) WithMaxMemoryUsage(maxMemoryUsageInBytes int) *Cache {
+	if maxMemoryUsageInBytes < 0 {
+		maxMemoryUsageInBytes = NoMaxMemoryUsage
+	}
+	cache.maxMemoryUsage = maxMemoryUsageInBytes
+	return cache
+}
+
+// WithEvictionPolicy sets eviction algorithm.
+// Defaults to FirstInFirstOut (FIFO)
+func (cache *Cache) WithEvictionPolicy(policy EvictionPolicy) *Cache {
+	cache.evictionPolicy = policy
+	return cache
+}
+
+// WithForceNilInterfaceOnNilPointer sets whether all Set-like functions should set a value as nil if the
+// interface passed has a nil value but not a nil type.
+//
+// In Go, an interface is only nil if both its type and value are nil, which means that a nil pointer
+// (e.g. (*Struct)(nil)) will retain its attribution to the type, and the unmodified value returned from
+// Cache.Get, for instance, would return false when compared with nil if this option is set to false.
+//
+// We can bypass this by detecting if the interface's value is nil and setting it to nil rather than
+// a nil pointer, which will make the value returned from Cache.Get return true when compared with nil.
+// This is exactly what passing true to WithForceNilInterfaceOnNilPointer does, and it's also the default behavior.
+//
+// Alternatively, you may pass false to WithForceNilInterfaceOnNilPointer, which will mean that you'll have
+// to cast the value returned from Cache.Get to its original type to check for whether the pointer returned
+// is nil or not.
+//
+// If set to true:
+//     cache := gocache.NewCache().WithForceNilInterfaceOnNilPointer(true)
+//     cache.Set("key", (*Struct)(nil))
+//     value, _ := cache.Get("key")
+//     // the following returns true, because the interface{} was forcefully set to nil
+//     if value == nil {}
+//     // the following will panic, because the value has been casted to its type
+//     if value.(*Struct) == nil {}
+//
+// If set to false:
+//     cache := gocache.NewCache().WithForceNilInterfaceOnNilPointer(false)
+//     cache.Set("key", (*Struct)(nil))
+//     value, _ := cache.Get("key")
+//     // the following returns false, because the interface{} returned has a non-nil type (*Struct)
+//     if value == nil {}
+//     // the following returns true, because the value has been casted to its type
+//     if value.(*Struct) == nil {}
+//
+// In other words, if set to true, you do not need to cast the value returned from the cache to
+// to check if the value is nil.
+//
+// Defaults to true
+func (cache *Cache) WithForceNilInterfaceOnNilPointer(forceNilInterfaceOnNilPointer bool) *Cache {
+	cache.forceNilInterfaceOnNilPointer = forceNilInterfaceOnNilPointer
+	return cache
+}
+
+// NewCache creates a new Cache
+//
+// Should be used in conjunction with Cache.WithMaxSize, Cache.WithMaxMemoryUsage and/or Cache.WithEvictionPolicy
+//     gocache.NewCache().WithMaxSize(10000).WithEvictionPolicy(gocache.LeastRecentlyUsed)
+//
+func NewCache() *Cache {
+	return &Cache{
+		maxSize:                       DefaultMaxSize,
+		evictionPolicy:                FirstInFirstOut,
+		stats:                         &Statistics{},
+		entries:                       make(map[string]*Entry),
+		mutex:                         sync.RWMutex{},
+		stopJanitor:                   nil,
+		forceNilInterfaceOnNilPointer: true,
+	}
+}
+
+// Set creates or updates a key with a given value
+func (cache *Cache) Set(key string, value interface{}) {
+	cache.SetWithTTL(key, value, NoExpiration)
+}
+
+// SetWithTTL creates or updates a key with a given value and sets an expiration time (-1 is NoExpiration)
+//
+// The TTL provided must be greater than 0, or NoExpiration (-1). If a negative value that isn't -1 (NoExpiration) is
+// provided, the entry will not be created if the key doesn't exist
+func (cache *Cache) SetWithTTL(key string, value interface{}, ttl time.Duration) {
+	// An interface is only nil if both its value and its type are nil, however, passing a pointer
+	if cache.forceNilInterfaceOnNilPointer {
+		if value != nil && (reflect.ValueOf(value).Kind() == reflect.Ptr && reflect.ValueOf(value).IsNil()) {
+			value = nil
+		}
+	}
+	cache.mutex.Lock()
+	entry, ok := cache.get(key)
+	if !ok {
+		// A negative TTL that isn't -1 (NoExpiration) or 0 is an entry that will expire instantly,
+		// so might as well just not create it in the first place
+		if ttl != NoExpiration && ttl < 1 {
+			cache.mutex.Unlock()
+			return
+		}
+		// Cache entry doesn't exist, so we have to create a new one
+		entry = &Entry{
+			Key:               key,
+			Value:             value,
+			RelevantTimestamp: time.Now(),
+			previous:          cache.head,
+		}
+		if cache.head == nil {
+			cache.tail = entry
+		} else {
+			cache.head.next = entry
+		}
+		cache.head = entry
+		cache.entries[key] = entry
+		if cache.maxMemoryUsage != NoMaxMemoryUsage {
+			cache.memoryUsage += entry.SizeInBytes()
+		}
+	} else {
+		// A negative TTL that isn't -1 (NoExpiration) or 0 is an entry that will expire instantly,
+		// so might as well just delete it immediately instead of updating it
+		if ttl != NoExpiration && ttl < 1 {
+			cache.delete(key)
+			cache.mutex.Unlock()
+			return
+		}
+		if cache.maxMemoryUsage != NoMaxMemoryUsage {
+			// Substract the old entry from the cache's memoryUsage
+			cache.memoryUsage -= entry.SizeInBytes()
+		}
+		// Update existing entry's value
+		entry.Value = value
+		entry.RelevantTimestamp = time.Now()
+		if cache.maxMemoryUsage != NoMaxMemoryUsage {
+			// Add the memory usage of the new entry to the cache's memoryUsage
+			cache.memoryUsage += entry.SizeInBytes()
+		}
+		// Because we just updated the entry, we need to move it back to HEAD
+		cache.moveExistingEntryToHead(entry)
+	}
+	if ttl != NoExpiration {
+		entry.Expiration = time.Now().Add(ttl).UnixNano()
+	} else {
+		entry.Expiration = NoExpiration
+	}
+	// If the cache doesn't have a maxSize/maxMemoryUsage, then there's no point checking if we need to evict
+	// an entry, so we'll just return now
+	if cache.maxSize == NoMaxSize && cache.maxMemoryUsage == NoMaxMemoryUsage {
+		cache.mutex.Unlock()
+		return
+	}
+	// If there's a maxSize and the cache has more entries than the maxSize, evict
+	if cache.maxSize != NoMaxSize && len(cache.entries) > cache.maxSize {
+		cache.evict()
+	}
+	// If there's a maxMemoryUsage and the memoryUsage is above the maxMemoryUsage, evict
+	if cache.maxMemoryUsage != NoMaxMemoryUsage && cache.memoryUsage > cache.maxMemoryUsage {
+		for cache.memoryUsage > cache.maxMemoryUsage && len(cache.entries) > 0 {
+			cache.evict()
+		}
+	}
+	cache.mutex.Unlock()
+}
+
+// SetAll creates or updates multiple values
+func (cache *Cache) SetAll(entries map[string]interface{}) {
+	for key, value := range entries {
+		cache.SetWithTTL(key, value, NoExpiration)
+	}
+}
+
+// Get retrieves an entry using the key passed as parameter
+// If there is no such entry, the value returned will be nil and the boolean will be false
+// If there is an entry, the value returned will be the value cached and the boolean will be true
+func (cache *Cache) Get(key string) (interface{}, bool) {
+	cache.mutex.Lock()
+	entry, ok := cache.get(key)
+	if !ok {
+		cache.mutex.Unlock()
+		cache.stats.Misses++
+		return nil, false
+	}
+	if entry.Expired() {
+		cache.stats.ExpiredKeys++
+		cache.delete(key)
+		cache.mutex.Unlock()
+		return nil, false
+	}
+	cache.stats.Hits++
+	if cache.evictionPolicy == LeastRecentlyUsed {
+		entry.Accessed()
+		if cache.head == entry {
+			cache.mutex.Unlock()
+			return entry.Value, true
+		}
+		// Because the eviction policy is LRU, we need to move the entry back to HEAD
+		cache.moveExistingEntryToHead(entry)
+	}
+	cache.mutex.Unlock()
+	return entry.Value, true
+}
+
+// GetByKeys retrieves multiple entries using the keys passed as parameter
+// All keys are returned in the map, regardless of whether they exist or not, however, entries that do not exist in the
+// cache will return nil, meaning that there is no way of determining whether a key genuinely has the value nil, or
+// whether it doesn't exist in the cache using only this function.
+func (cache *Cache) GetByKeys(keys []string) map[string]interface{} {
+	entries := make(map[string]interface{})
+	for _, key := range keys {
+		entries[key], _ = cache.Get(key)
+	}
+	return entries
+}
+
+// GetAll retrieves all cache entries
+//
+// If the eviction policy is LeastRecentlyUsed, note that unlike Get and GetByKeys, this does not update the last access
+// timestamp. The reason for this is that since all cache entries will be accessed, updating the last access timestamp
+// would provide very little benefit while harming the ability to accurately determine the next key that will be evicted
+//
+// You should probably avoid using this if you have a lot of entries.
+//
+// GetKeysByPattern is a good alternative if you want to retrieve entries that you do not have the key for, as it only
+// retrieves the keys and does not trigger active eviction and has a parameter for setting a limit to the number of keys
+// you wish to retrieve.
+func (cache *Cache) GetAll() map[string]interface{} {
+	entries := make(map[string]interface{})
+	cache.mutex.Lock()
+	for key, entry := range cache.entries {
+		if entry.Expired() {
+			cache.delete(key)
+			continue
+		}
+		entries[key] = entry.Value
+	}
+	cache.stats.Hits += uint64(len(entries))
+	cache.mutex.Unlock()
+	return entries
+}
+
+// GetKeysByPattern retrieves a slice of keys that match a given pattern
+// If the limit is set to 0, the entire cache will be searched for matching keys.
+// If the limit is above 0, the search will stop once the specified number of matching keys have been found.
+//
+// e.g.
+//     cache.GetKeysByPattern("*some*", 0) will return all keys containing "some" in them
+//     cache.GetKeysByPattern("*some*", 5) will return 5 keys (or less) containing "some" in them
+//
+// Note that GetKeysByPattern does not trigger active evictions, nor does it count as accessing the entry, the latter
+// only applying if the cache uses the LeastRecentlyUsed eviction policy.
+// The reason for that behavior is that these two (active eviction and access) only applies when you access the value
+// of the cache entry, and this function only returns the keys.
+func (cache *Cache) GetKeysByPattern(pattern string, limit int) []string {
+	var matchingKeys []string
+	cache.mutex.Lock()
+	for key, value := range cache.entries {
+		if value.Expired() {
+			continue
+		}
+		if MatchPattern(pattern, key) {
+			matchingKeys = append(matchingKeys, key)
+			if limit > 0 && len(matchingKeys) >= limit {
+				break
+			}
+		}
+	}
+	cache.mutex.Unlock()
+	return matchingKeys
+}
+
+// Delete removes a key from the cache
+//
+// Returns false if the key did not exist.
+func (cache *Cache) Delete(key string) bool {
+	cache.mutex.Lock()
+	ok := cache.delete(key)
+	cache.mutex.Unlock()
+	return ok
+}
+
+// DeleteAll deletes multiple entries based on the keys passed as parameter
+//
+// Returns the number of keys deleted
+func (cache *Cache) DeleteAll(keys []string) int {
+	numberOfKeysDeleted := 0
+	cache.mutex.Lock()
+	for _, key := range keys {
+		if cache.delete(key) {
+			numberOfKeysDeleted++
+		}
+	}
+	cache.mutex.Unlock()
+	return numberOfKeysDeleted
+}
+
+// Count returns the total amount of entries in the cache, regardless of whether they're expired or not
+func (cache *Cache) Count() int {
+	cache.mutex.RLock()
+	count := len(cache.entries)
+	cache.mutex.RUnlock()
+	return count
+}
+
+// Clear deletes all entries from the cache
+func (cache *Cache) Clear() {
+	cache.mutex.Lock()
+	cache.entries = make(map[string]*Entry)
+	cache.memoryUsage = 0
+	cache.head = nil
+	cache.tail = nil
+	cache.mutex.Unlock()
+}
+
+// TTL returns the time until the cache entry specified by the key passed as parameter
+// will be deleted.
+func (cache *Cache) TTL(key string) (time.Duration, error) {
+	cache.mutex.RLock()
+	entry, ok := cache.get(key)
+	cache.mutex.RUnlock()
+	if !ok {
+		return 0, ErrKeyDoesNotExist
+	}
+	if entry.Expiration == NoExpiration {
+		return 0, ErrKeyHasNoExpiration
+	}
+	timeUntilExpiration := time.Until(time.Unix(0, entry.Expiration))
+	if timeUntilExpiration < 0 {
+		// The key has already expired but hasn't been deleted yet.
+		// From the client's perspective, this means that the cache entry doesn't exist
+		return 0, ErrKeyDoesNotExist
+	}
+	return timeUntilExpiration, nil
+}
+
+// Expire sets a key's expiration time
+//
+// A TTL of -1 means that the key will never expire
+// A TTL of 0 means that the key will expire immediately
+// If using LRU, note that this does not reset the position of the key
+//
+// Returns true if the cache key exists and has had its expiration time altered
+func (cache *Cache) Expire(key string, ttl time.Duration) bool {
+	entry, ok := cache.get(key)
+	if !ok || entry.Expired() {
+		return false
+	}
+	if ttl != NoExpiration {
+		entry.Expiration = time.Now().Add(ttl).UnixNano()
+	} else {
+		entry.Expiration = NoExpiration
+	}
+	return true
+}
+
+// get retrieves an entry using the key passed as parameter, but unlike Get, it doesn't update the access time or
+// move the position of the entry to the head
+func (cache *Cache) get(key string) (*Entry, bool) {
+	entry, ok := cache.entries[key]
+	return entry, ok
+}
+
+func (cache *Cache) delete(key string) bool {
+	entry, ok := cache.entries[key]
+	if ok {
+		if cache.maxMemoryUsage != NoMaxMemoryUsage {
+			cache.memoryUsage -= entry.SizeInBytes()
+		}
+		cache.removeExistingEntryReferences(entry)
+		delete(cache.entries, key)
+	}
+	return ok
+}
+
+// moveExistingEntryToHead replaces the current cache head for an existing entry
+func (cache *Cache) moveExistingEntryToHead(entry *Entry) {
+	if !(entry == cache.head && entry == cache.tail) {
+		cache.removeExistingEntryReferences(entry)
+	}
+	if entry != cache.head {
+		entry.previous = cache.head
+		entry.next = nil
+		if cache.head != nil {
+			cache.head.next = entry
+		}
+		cache.head = entry
+	}
+}
+
+// removeExistingEntryReferences modifies the next and previous reference of an existing entry and re-links
+// the next and previous entry accordingly, as well as the cache head or/and the cache tail if necessary.
+// Note that it does not remove the entry from the cache, only the references.
+func (cache *Cache) removeExistingEntryReferences(entry *Entry) {
+	if cache.tail == entry && cache.head == entry {
+		cache.tail = nil
+		cache.head = nil
+	} else if cache.tail == entry {
+		cache.tail = cache.tail.next
+	} else if cache.head == entry {
+		cache.head = cache.head.previous
+	}
+	if entry.previous != nil {
+		entry.previous.next = entry.next
+	}
+	if entry.next != nil {
+		entry.next.previous = entry.previous
+	}
+	entry.next = nil
+	entry.previous = nil
+}
+
+// evict removes the tail from the cache
+func (cache *Cache) evict() {
+	if cache.tail == nil || len(cache.entries) == 0 {
+		return
+	}
+	if cache.tail != nil {
+		oldTail := cache.tail
+		cache.removeExistingEntryReferences(oldTail)
+		delete(cache.entries, oldTail.Key)
+		if cache.maxMemoryUsage != NoMaxMemoryUsage {
+			cache.memoryUsage -= oldTail.SizeInBytes()
+		}
+		cache.stats.EvictedKeys++
+	}
+}

vendor/github.com/TwinProduction/gocache/janitor.go

@@ -0,0 +1,140 @@
+package gocache
+
+import (
+	"log"
+	"time"
+)
+
+const (
+	// JanitorShiftTarget is the target number of expired keys to find during passive clean up duty
+	// before pausing the passive expired keys eviction process
+	JanitorShiftTarget = 25
+
+	// JanitorMaxIterationsPerShift is the maximum number of nodes to traverse before pausing
+	JanitorMaxIterationsPerShift = 1000
+
+	// JanitorMinShiftBackOff is the minimum interval between each iteration of steps
+	// defined by JanitorMaxIterationsPerShift
+	JanitorMinShiftBackOff = time.Millisecond * 50
+
+	// JanitorMaxShiftBackOff is the maximum interval between each iteration of steps
+	// defined by JanitorMaxIterationsPerShift
+	JanitorMaxShiftBackOff = time.Millisecond * 500
+)
+
+// StartJanitor starts the janitor on a different goroutine
+// The janitor's job is to delete expired keys in the background, in other words, it takes care of passive eviction.
+// It can be stopped by calling Cache.StopJanitor.
+// If you do not start the janitor, expired keys will only be deleted when they are accessed through Get, GetByKeys, or
+// GetAll.
+func (cache *Cache) StartJanitor() error {
+	if cache.stopJanitor != nil {
+		return ErrJanitorAlreadyRunning
+	}
+	cache.stopJanitor = make(chan bool)
+	go func() {
+		// rather than starting from the tail on every run, we can try to start from the last next entry
+		var lastTraversedNode *Entry
+		totalNumberOfExpiredKeysInPreviousRunFromTailToHead := 0
+		backOff := JanitorMinShiftBackOff
+		for {
+			select {
+			case <-time.After(backOff):
+				// Passive clean up duty
+				cache.mutex.Lock()
+				if cache.tail != nil {
+					start := time.Now()
+					steps := 0
+					expiredEntriesFound := 0
+					current := cache.tail
+					if lastTraversedNode != nil {
+						// Make sure the lastTraversedNode is still in the cache, otherwise we might be traversing nodes that were already deleted.
+						// Furthermore, we need to make sure that the entry from the cache has the same pointer as the lastTraversedNode
+						// to verify that there isn't just a new cache entry with the same key (i.e. in case lastTraversedNode got evicted)
+						if entryFromCache, isInCache := cache.get(lastTraversedNode.Key); isInCache && entryFromCache == lastTraversedNode {
+							current = lastTraversedNode
+						}
+					}
+					if current == cache.tail {
+						if Debug {
+							log.Printf("There are currently %d entries in the cache. The last walk resulted in finding %d expired keys", len(cache.entries), totalNumberOfExpiredKeysInPreviousRunFromTailToHead)
+						}
+						totalNumberOfExpiredKeysInPreviousRunFromTailToHead = 0
+					}
+					for current != nil {
+						var next *Entry
+						steps++
+						if current.Expired() {
+							expiredEntriesFound++
+							// Because delete will remove the next reference from the entry, we need to store the
+							// next reference before we delete it
+							next = current.next
+							cache.delete(current.Key)
+							cache.stats.ExpiredKeys++
+						}
+						if current == cache.head {
+							lastTraversedNode = nil
+							break
+						}
+						// Travel to the current node's next node only if no specific next node has been specified
+						if next != nil {
+							current = next
+						} else {
+							current = current.next
+						}
+						lastTraversedNode = current
+						if steps == JanitorMaxIterationsPerShift || expiredEntriesFound >= JanitorShiftTarget {
+							if expiredEntriesFound > 0 {
+								backOff = JanitorMinShiftBackOff
+							} else {
+								if backOff*2 <= JanitorMaxShiftBackOff {
+									backOff *= 2
+								} else {
+									backOff = JanitorMaxShiftBackOff
+								}
+							}
+							break
+						}
+					}
+					if Debug {
+						log.Printf("traversed %d nodes and found %d expired entries in %s before stopping\n", steps, expiredEntriesFound, time.Since(start))
+					}
+					totalNumberOfExpiredKeysInPreviousRunFromTailToHead += expiredEntriesFound
+				} else {
+					if backOff*2 < JanitorMaxShiftBackOff {
+						backOff *= 2
+					} else {
+						backOff = JanitorMaxShiftBackOff
+					}
+				}
+				cache.mutex.Unlock()
+			case <-cache.stopJanitor:
+				cache.stopJanitor <- true
+				return
+			}
+		}
+	}()
+	//if Debug {
+	//	go func() {
+	//		var m runtime.MemStats
+	//		for {
+	//			runtime.ReadMemStats(&m)
+	//			log.Printf("Alloc=%vMB; HeapReleased=%vMB; Sys=%vMB; HeapInUse=%vMB; HeapObjects=%v; HeapObjectsFreed=%v; GC=%v; cache.memoryUsage=%vMB; cacheSize=%d\n", m.Alloc/1024/1024, m.HeapReleased/1024/1024, m.Sys/1024/1024, m.HeapInuse/1024/1024, m.HeapObjects, m.Frees, m.NumGC, cache.memoryUsage/1024/1024, cache.Count())
+	//			time.Sleep(3 * time.Second)
+	//		}
+	//	}()
+	//}
+	return nil
+}
+
+// StopJanitor stops the janitor
+func (cache *Cache) StopJanitor() {
+	if cache.stopJanitor != nil {
+		// Tell the janitor to stop, and then wait for the janitor to reply on the same channel that it's stopping
+		// This may seem a bit odd, but this allows us to avoid a data race condition in which setting cache.stopJanitor
+		// to nil
+		cache.stopJanitor <- true
+		<-cache.stopJanitor
+		cache.stopJanitor = nil
+	}
+}

vendor/github.com/TwinProduction/gocache/pattern.go

@@ -0,0 +1,12 @@
+package gocache
+
+import "path/filepath"
+
+// MatchPattern checks whether a string matches a pattern
+func MatchPattern(pattern, s string) bool {
+	if pattern == "*" {
+		return true
+	}
+	matched, _ := filepath.Match(pattern, s)
+	return matched
+}

vendor/github.com/TwinProduction/gocache/persistence.go

@@ -0,0 +1,148 @@
+package gocache
+
+import (
+	"bytes"
+	"encoding/gob"
+	"log"
+	"os"
+	"sort"
+	"time"
+
+	"github.com/boltdb/bolt"
+)
+
+// SaveToFile stores the content of the cache to a file so that it can be read using
+// the ReadFromFile function
+func (cache *Cache) SaveToFile(path string) error {
+	db, err := bolt.Open(path, os.ModePerm, nil)
+	if err != nil {
+		return err
+	}
+	start := time.Now()
+	cache.mutex.RLock()
+	bulkEntries := make([]*Entry, len(cache.entries))
+	i := 0
+	for _, v := range cache.entries {
+		bulkEntries[i] = v
+		i++
+	}
+	cache.mutex.RUnlock()
+	if Debug {
+		log.Printf("unlocked after %s", time.Since(start))
+	}
+	err = db.Update(func(tx *bolt.Tx) error {
+		_ = tx.DeleteBucket([]byte("entries"))
+		bucket, err := tx.CreateBucket([]byte("entries"))
+		if err != nil {
+			return err
+		}
+		for _, bulkEntry := range bulkEntries {
+			buffer := bytes.Buffer{}
+			err = gob.NewEncoder(&buffer).Encode(bulkEntry)
+			if err != nil {
+				// Failed to encode the value, so we'll skip it.
+				// This is likely due to the fact that the custom struct wasn't registered using gob.Register(...)
+				// See [Persistence - Limitations](https://github.com/TwinProduction/gocache#limitations)
+				continue
+			}
+			bucket.Put([]byte(bulkEntry.Key), buffer.Bytes())
+		}
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+	return db.Close()
+}
+
+// ReadFromFile populates the cache using a file created using cache.SaveToFile(path)
+//
+// Note that if the number of entries retrieved from the file exceed the configured maxSize,
+// the extra entries will be automatically evicted according to the EvictionPolicy configured.
+// This function returns the number of entries evicted, and because this function only reads
+// from a file and does not modify it, you can safely retry this function after configuring
+// the cache with the appropriate maxSize, should you desire to.
+func (cache *Cache) ReadFromFile(path string) (int, error) {
+	db, err := bolt.Open(path, os.ModePerm, nil)
+	if err != nil {
+		return 0, err
+	}
+	defer db.Close()
+	cache.mutex.Lock()
+	defer cache.mutex.Unlock()
+	err = db.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte("entries"))
+		// If the bucket doesn't exist, there's nothing to read, so we'll return right now
+		if bucket == nil {
+			return nil
+		}
+		err = bucket.ForEach(func(k, v []byte) error {
+			buffer := new(bytes.Buffer)
+			decoder := gob.NewDecoder(buffer)
+			entry := Entry{}
+			buffer.Write(v)
+			err := decoder.Decode(&entry)
+			if err != nil {
+				// Failed to decode the value, so we'll skip it.
+				// This is likely due to the fact that the custom struct wasn't registered using gob.Register(...)
+				// See [Persistence - Limitations](https://github.com/TwinProduction/gocache#limitations)
+				return err
+			}
+			cache.entries[string(k)] = &entry
+			buffer.Reset()
+			return nil
+		})
+		return err
+	})
+	if err != nil {
+		return 0, err
+	}
+	// Because pointers don't get stored in the file, we need to relink everything from head to tail
+	var entries []*Entry
+	for _, v := range cache.entries {
+		entries = append(entries, v)
+	}
+	// Sort the slice of entries from oldest to newest
+	sort.Slice(entries, func(i, j int) bool {
+		return entries[i].RelevantTimestamp.Before(entries[j].RelevantTimestamp)
+	})
+	// Relink the nodes from tail to head
+	var previous *Entry
+	for i := range entries {
+		current := entries[i]
+		if previous == nil {
+			cache.tail = current
+			cache.head = current
+		} else {
+			previous.next = current
+			current.previous = previous
+			cache.head = current
+		}
+		previous = entries[i]
+		if cache.maxMemoryUsage != NoMaxMemoryUsage {
+			cache.memoryUsage += current.SizeInBytes()
+		}
+	}
+	// If the cache doesn't have a maxSize/maxMemoryUsage, then there's no point checking if we need to evict
+	// an entry, so we'll just return now
+	if cache.maxSize == NoMaxSize && cache.maxMemoryUsage == NoMaxMemoryUsage {
+		return 0, nil
+	}
+	// Evict what needs to be evicted
+	numberOfEvictions := 0
+	// If there's a maxSize and the cache has more entries than the maxSize, evict
+	if cache.maxSize != NoMaxSize && len(cache.entries) > cache.maxSize {
+		for len(cache.entries) > cache.maxSize {
+			numberOfEvictions++
+			cache.evict()
+		}
+	}
+	// If there's a maxMemoryUsage and the memoryUsage is above the maxMemoryUsage, evict
+	if cache.maxMemoryUsage != NoMaxMemoryUsage && cache.memoryUsage > cache.maxMemoryUsage {
+		for cache.memoryUsage > cache.maxMemoryUsage && len(cache.entries) > 0 {
+			numberOfEvictions++
+			cache.evict()
+		}
+	}
+	return numberOfEvictions, nil
+}

vendor/github.com/TwinProduction/gocache/policy.go

@@ -0,0 +1,8 @@
+package gocache
+
+type EvictionPolicy string
+
+var (
+	LeastRecentlyUsed EvictionPolicy = "LeastRecentlyUsed"
+	FirstInFirstOut   EvictionPolicy = "FirstInFirstOut"
+)

vendor/github.com/TwinProduction/gocache/statistics.go

@@ -0,0 +1,15 @@
+package gocache
+
+type Statistics struct {
+	// EvictedKeys is the number of keys that were evicted
+	EvictedKeys uint64
+
+	// ExpiredKeys is the number of keys that were automatically deleted as a result of expiring
+	ExpiredKeys uint64
+
+	// Hits is the number of cache hits
+	Hits uint64
+
+	// Misses is the number of cache misses
+	Misses uint64
+}

vendor/github.com/boltdb/bolt/.gitignore

@@ -0,0 +1,4 @@
+*.prof
+*.test
+*.swp
+/bin/

vendor/github.com/boltdb/bolt/LICENSE

@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Ben Johnson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/boltdb/bolt/Makefile

@@ -0,0 +1,18 @@
+BRANCH=`git rev-parse --abbrev-ref HEAD`
+COMMIT=`git rev-parse --short HEAD`
+GOLDFLAGS="-X main.branch $(BRANCH) -X main.commit $(COMMIT)"
+
+default: build
+
+race:
+	@go test -v -race -test.run="TestSimulate_(100op|1000op)"
+
+# go get github.com/kisielk/errcheck
+errcheck:
+	@errcheck -ignorepkg=bytes -ignore=os:Remove github.com/boltdb/bolt
+
+test: 
+	@go test -v -cover .
+	@go test -v ./cmd/bolt
+
+.PHONY: fmt test