Minor update

First implementation of longer result history

.dockerignore

@@ -3,3 +3,4 @@ Dockerfile
 .github
 .idea
 .git
+web/app

.github/codecov.yml

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

.github/workflows/build.yml

@@ -15,16 +15,18 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Set up Go 1.15
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2
         with:
           go-version: 1.15
-        id: go
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
       - name: Build binary to make sure it works
         run: go build -mod vendor
       - name: Test
-        run: go test -mod vendor ./... -race -coverprofile=coverage.txt -covermode=atomic
+        # We're using "sudo" because one of the tests leverages ping, which requires super-user privileges.
+        # As for the 'env "PATH=$PATH" "GOROOT=$GOROOT"', we need it to use the same "go" executable that
+        # was configured by the "Set up Go 1.15" step (otherwise, it'd use sudo's "go" executable)
+        run: sudo env "PATH=$PATH" "GOROOT=$GOROOT" go test -mod vendor ./... -race -coverprofile=coverage.txt -covermode=atomic
       - name: Codecov
         uses: codecov/codecov-action@v1.0.14
         with:

.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

@@ -1,3 +1,4 @@
-bin
 .idea
 .vscode
+gatus
+db.db

Dockerfile

@@ -13,7 +13,7 @@ RUN CGO_ENABLED=0 GOOS=linux go build -mod vendor -a -installsuffix cgo -o gatus
 FROM scratch
 COPY --from=builder /app/gatus .
 COPY --from=builder /app/config.yaml ./config/config.yaml
-COPY --from=builder /app/static static/
+COPY --from=builder /app/web/static ./web/static
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 ENV PORT=8080
 EXPOSE ${PORT}

Makefile

@@ -0,0 +1,14 @@
+docker-build:
+	docker build -t twinproduction/gatus:latest .
+
+docker-build-and-run:
+	docker build -t twinproduction/gatus:latest . && docker run -p 8080:8080 --name gatus twinproduction/gatus:latest
+
+build-frontend:
+	npm --prefix web/app run build
+
+run-frontend:
+	npm --prefix web/app run serve
+
+test:
+	go test ./alerting/... ./client/... ./config/... ./controller/... ./core/... ./jsonpath/... ./pattern/... ./security/... ./storage/... ./util/... ./watchdog/... -cover

alerting/provider/custom/custom.go

@@ -2,9 +2,11 @@ package custom
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"os"
 	"strings"
 
 	"github.com/TwinProduction/gatus/client"
@@ -14,11 +16,12 @@ import (
 // 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"`
+	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"`
+	Placeholders map[string]map[string]string `yaml:"placeholders,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
@@ -31,10 +34,25 @@ func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, aler
 	return provider
 }
 
-func (provider *AlertProvider) buildRequest(serviceName, alertDescription string, resolved bool) *http.Request {
+// GetAlertStatePlaceholderValue returns the Placeholder value for ALERT_TRIGGERED_OR_RESOLVED if configured
+func (provider *AlertProvider) GetAlertStatePlaceholderValue(resolved bool) string {
+	status := "TRIGGERED"
+	if resolved {
+		status = "RESOLVED"
+	}
+	if _, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"]; ok {
+		if val, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"][status]; ok {
+			return val
+		}
+	}
+	return status
+}
+
+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)
 	}
@@ -43,9 +61,9 @@ func (provider *AlertProvider) buildRequest(serviceName, alertDescription string
 	}
 	if strings.Contains(body, "[ALERT_TRIGGERED_OR_RESOLVED]") {
 		if resolved {
-			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", "RESOLVED")
+			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
 		} else {
-			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", "TRIGGERED")
+			body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
 		}
 	}
 	if strings.Contains(providerURL, "[ALERT_DESCRIPTION]") {
@@ -56,9 +74,9 @@ func (provider *AlertProvider) buildRequest(serviceName, alertDescription string
 	}
 	if strings.Contains(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]") {
 		if resolved {
-			providerURL = strings.ReplaceAll(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]", "RESOLVED")
+			providerURL = strings.ReplaceAll(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
 		} else {
-			providerURL = strings.ReplaceAll(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]", "TRIGGERED")
+			providerURL = strings.ReplaceAll(providerURL, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
 		}
 	}
 	if len(method) == 0 {
@@ -74,7 +92,13 @@ func (provider *AlertProvider) buildRequest(serviceName, alertDescription string
 
 // Send a request to the alert provider and return the body
 func (provider *AlertProvider) Send(serviceName, alertDescription string, resolved bool) ([]byte, error) {
-	request := provider.buildRequest(serviceName, alertDescription, resolved)
+	if os.Getenv("MOCK_ALERT_PROVIDER") == "true" {
+		if os.Getenv("MOCK_ALERT_PROVIDER_ERROR") == "true" {
+			return nil, errors.New("error")
+		}
+		return []byte("{}"), nil
+	}
+	request := provider.buildHTTPRequest(serviceName, alertDescription, resolved)
 	response, err := client.GetHTTPClient(provider.Insecure).Do(request)
 	if err != nil {
 		return nil, err

alerting/provider/custom/custom_test.go

@@ -1,9 +1,10 @@
 package custom
 
 import (
-	"github.com/TwinProduction/gatus/core"
 	"io/ioutil"
 	"testing"
+
+	"github.com/TwinProduction/gatus/core"
 )
 
 func TestAlertProvider_IsValid(t *testing.T) {
@@ -17,7 +18,7 @@ func TestAlertProvider_IsValid(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_buildRequestWhenResolved(t *testing.T) {
+func TestAlertProvider_buildHTTPRequestWhenResolved(t *testing.T) {
 	const (
 		ExpectedURL  = "http://example.com/service-name?event=RESOLVED&description=alert-description"
 		ExpectedBody = "service-name,alert-description,RESOLVED"
@@ -27,7 +28,7 @@ func TestAlertProvider_buildRequestWhenResolved(t *testing.T) {
 		Body:    "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
 		Headers: nil,
 	}
-	request := customAlertProvider.buildRequest("service-name", "alert-description", true)
+	request := customAlertProvider.buildHTTPRequest("service-name", "alert-description", true)
 	if request.URL.String() != ExpectedURL {
 		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
 	}
@@ -37,7 +38,7 @@ func TestAlertProvider_buildRequestWhenResolved(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_buildRequestWhenTriggered(t *testing.T) {
+func TestAlertProvider_buildHTTPRequestWhenTriggered(t *testing.T) {
 	const (
 		ExpectedURL  = "http://example.com/service-name?event=TRIGGERED&description=alert-description"
 		ExpectedBody = "service-name,alert-description,TRIGGERED"
@@ -47,7 +48,7 @@ func TestAlertProvider_buildRequestWhenTriggered(t *testing.T) {
 		Body:    "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
 		Headers: map[string]string{"Authorization": "Basic hunter2"},
 	}
-	request := customAlertProvider.buildRequest("service-name", "alert-description", false)
+	request := customAlertProvider.buildHTTPRequest("service-name", "alert-description", false)
 	if request.URL.String() != ExpectedURL {
 		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
 	}
@@ -61,9 +62,49 @@ 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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
-	if customAlertProvider != customAlertProvider {
-		t.Error("customAlertProvider should've been equal to customAlertProvider")
+	if customAlertProvider.URL != "http://example.com" {
+		t.Error("expected URL to be http://example.com, got", customAlertProvider.URL)
+	}
+}
+
+func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
+	const (
+		ExpectedURL  = "http://example.com/service-name?event=test&description=alert-description"
+		ExpectedBody = "service-name,alert-description,test"
+	)
+	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,
+		Placeholders: map[string]map[string]string{
+			"ALERT_TRIGGERED_OR_RESOLVED": {
+				"RESOLVED": "test",
+			},
+		},
+	}
+	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_GetAlertStatePlaceholderValueDefaults(t *testing.T) {
+	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,
+		Placeholders: nil,
+	}
+	if customAlertProvider.GetAlertStatePlaceholderValue(true) != "RESOLVED" {
+		t.Error("expected RESOLVED, got", customAlertProvider.GetAlertStatePlaceholderValue(true))
+	}
+	if customAlertProvider.GetAlertStatePlaceholderValue(false) != "TRIGGERED" {
+		t.Error("expected TRIGGERED, got", customAlertProvider.GetAlertStatePlaceholderValue(false))
 	}
 }

alerting/provider/mattermost/mattermost.go

@@ -38,7 +38,7 @@ func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, aler
 		} else {
 			prefix = ":x:"
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+		results += fmt.Sprintf("%s - `%s`\\n", prefix, conditionResult.Condition)
 	}
 	return &custom.AlertProvider{
 		URL:      provider.WebhookURL,

alerting/provider/mattermost/mattermost_test.go

@@ -1,9 +1,12 @@
 package mattermost
 
 import (
-	"github.com/TwinProduction/gatus/core"
+	"encoding/json"
+	"net/http"
 	"strings"
 	"testing"
+
+	"github.com/TwinProduction/gatus/core"
 )
 
 func TestAlertProvider_IsValid(t *testing.T) {
@@ -18,23 +21,45 @@ func TestAlertProvider_IsValid(t *testing.T) {
 }
 
 func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
-	provider := AlertProvider{WebhookURL: "http://example.com"}
+	provider := AlertProvider{WebhookURL: "http://example.org"}
 	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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "resolved") {
 		t.Error("customAlertProvider.Body should've contained the substring resolved")
 	}
+	if customAlertProvider.URL != "http://example.org" {
+		t.Errorf("expected URL to be %s, got %s", "http://example.org", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }
 
 func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
-	provider := AlertProvider{WebhookURL: "http://example.com"}
+	provider := AlertProvider{WebhookURL: "http://example.org"}
 	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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "triggered") {
 		t.Error("customAlertProvider.Body should've contained the substring triggered")
 	}
+	if customAlertProvider.URL != "http://example.org" {
+		t.Errorf("expected URL to be %s, got %s", "http://example.org", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }

alerting/provider/messagebird/messagebird_test.go

@@ -1,6 +1,8 @@
 package messagebird
 
 import (
+	"encoding/json"
+	"net/http"
 	"strings"
 	"testing"
 
@@ -30,11 +32,22 @@ func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
 	}
 	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, true)
 	if customAlertProvider == nil {
-		t.Error("customAlertProvider shouldn't have been nil")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "RESOLVED") {
 		t.Error("customAlertProvider.Body should've contained the substring RESOLVED")
 	}
+	if customAlertProvider.URL != "https://rest.messagebird.com/messages" {
+		t.Errorf("expected URL to be %s, got %s", "https://rest.messagebird.com/messages", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }
 
 func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
@@ -45,9 +58,20 @@ func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
 	}
 	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, false)
 	if customAlertProvider == nil {
-		t.Error("customAlertProvider shouldn't have been nil")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "TRIGGERED") {
 		t.Error("customAlertProvider.Body should've contained the substring TRIGGERED")
 	}
+	if customAlertProvider.URL != "https://rest.messagebird.com/messages" {
+		t.Errorf("expected URL to be %s, got %s", "https://rest.messagebird.com/messages", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }

alerting/provider/pagerduty/pagerduty_test.go

@@ -1,9 +1,12 @@
 package pagerduty
 
 import (
-	"github.com/TwinProduction/gatus/core"
+	"encoding/json"
+	"net/http"
 	"strings"
 	"testing"
+
+	"github.com/TwinProduction/gatus/core"
 )
 
 func TestAlertProvider_IsValid(t *testing.T) {
@@ -21,20 +24,42 @@ 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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "RESOLVED") {
 		t.Error("customAlertProvider.Body should've contained the substring RESOLVED")
 	}
+	if customAlertProvider.URL != "https://events.pagerduty.com/v2/enqueue" {
+		t.Errorf("expected URL to be %s, got %s", "https://events.pagerduty.com/v2/enqueue", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }
 
 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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "TRIGGERED") {
 		t.Error("customAlertProvider.Body should've contained the substring TRIGGERED")
 	}
+	if customAlertProvider.URL != "https://events.pagerduty.com/v2/enqueue" {
+		t.Errorf("expected URL to be %s, got %s", "https://events.pagerduty.com/v2/enqueue", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }

alerting/provider/slack/slack.go

@@ -31,11 +31,11 @@ func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, aler
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
-			prefix = ":heavy_check_mark:"
+			prefix = ":white_check_mark:"
 		} else {
 			prefix = ":x:"
 		}
-		results += fmt.Sprintf("%s - `%s`\n", prefix, conditionResult.Condition)
+		results += fmt.Sprintf("%s - `%s`\\n", prefix, conditionResult.Condition)
 	}
 	return &custom.AlertProvider{
 		URL:    provider.WebhookURL,

alerting/provider/slack/slack_test.go

@@ -1,6 +1,8 @@
 package slack
 
 import (
+	"encoding/json"
+	"net/http"
 	"strings"
 	"testing"
 
@@ -22,20 +24,42 @@ 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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "resolved") {
 		t.Error("customAlertProvider.Body should've contained the substring resolved")
 	}
+	if customAlertProvider.URL != "http://example.com" {
+		t.Errorf("expected URL to be %s, got %s", "http://example.com", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }
 
 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")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "triggered") {
 		t.Error("customAlertProvider.Body should've contained the substring triggered")
 	}
+	if customAlertProvider.URL != "http://example.com" {
+		t.Errorf("expected URL to be %s, got %s", "http://example.com", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	body := make(map[string]interface{})
+	err := json.Unmarshal([]byte(customAlertProvider.Body), &body)
+	if err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
 }

alerting/provider/twilio/twilio_test.go

@@ -1,9 +1,11 @@
 package twilio
 
 import (
-	"github.com/TwinProduction/gatus/core"
+	"net/http"
 	"strings"
 	"testing"
+
+	"github.com/TwinProduction/gatus/core"
 )
 
 func TestTwilioAlertProvider_IsValid(t *testing.T) {
@@ -25,31 +27,49 @@ func TestTwilioAlertProvider_IsValid(t *testing.T) {
 func TestAlertProvider_ToCustomAlertProviderWithResolvedAlert(t *testing.T) {
 	provider := AlertProvider{
 		SID:   "1",
-		Token: "1",
-		From:  "1",
-		To:    "1",
+		Token: "2",
+		From:  "3",
+		To:    "4",
 	}
-	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, true)
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{Name: "service-name"}, &core.Alert{Description: "alert-description"}, &core.Result{}, true)
 	if customAlertProvider == nil {
-		t.Error("customAlertProvider shouldn't have been nil")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "RESOLVED") {
 		t.Error("customAlertProvider.Body should've contained the substring RESOLVED")
 	}
+	if customAlertProvider.URL != "https://api.twilio.com/2010-04-01/Accounts/1/Messages.json" {
+		t.Errorf("expected URL to be %s, got %s", "https://api.twilio.com/2010-04-01/Accounts/1/Messages.json", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	if customAlertProvider.Body != "Body=RESOLVED%3A+service-name+-+alert-description&From=3&To=4" {
+		t.Errorf("expected body to be %s, got %s", "Body=RESOLVED%3A+service-name+-+alert-description&From=3&To=4", customAlertProvider.Body)
+	}
 }
 
 func TestAlertProvider_ToCustomAlertProviderWithTriggeredAlert(t *testing.T) {
 	provider := AlertProvider{
-		SID:   "1",
-		Token: "1",
-		From:  "1",
+		SID:   "4",
+		Token: "3",
+		From:  "2",
 		To:    "1",
 	}
-	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{}, &core.Alert{}, &core.Result{}, false)
+	customAlertProvider := provider.ToCustomAlertProvider(&core.Service{Name: "service-name"}, &core.Alert{Description: "alert-description"}, &core.Result{}, false)
 	if customAlertProvider == nil {
-		t.Error("customAlertProvider shouldn't have been nil")
+		t.Fatal("customAlertProvider shouldn't have been nil")
 	}
 	if !strings.Contains(customAlertProvider.Body, "TRIGGERED") {
 		t.Error("customAlertProvider.Body should've contained the substring TRIGGERED")
 	}
+	if customAlertProvider.URL != "https://api.twilio.com/2010-04-01/Accounts/4/Messages.json" {
+		t.Errorf("expected URL to be %s, got %s", "https://api.twilio.com/2010-04-01/Accounts/4/Messages.json", customAlertProvider.URL)
+	}
+	if customAlertProvider.Method != http.MethodPost {
+		t.Errorf("expected method to be %s, got %s", http.MethodPost, customAlertProvider.Method)
+	}
+	if customAlertProvider.Body != "Body=TRIGGERED%3A+service-name+-+alert-description&From=2&To=1" {
+		t.Errorf("expected body to be %s, got %s", "Body=TRIGGERED%3A+service-name+-+alert-description&From=2&To=1", customAlertProvider.Body)
+	}
 }

client/client.go

@@ -5,11 +5,17 @@ import (
 	"net"
 	"net/http"
 	"time"
+
+	"github.com/go-ping/ping"
 )
 
 var (
 	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
 )
 
 // GetHTTPClient returns the shared HTTP client
@@ -17,10 +23,11 @@ func GetHTTPClient(insecure bool) *http.Client {
 	if insecure {
 		if insecureHTTPClient == nil {
 			insecureHTTPClient = &http.Client{
-				Timeout: time.Second * 10,
+				Timeout: 10 * time.Second,
 				Transport: &http.Transport{
 					MaxIdleConns:        100,
 					MaxIdleConnsPerHost: 20,
+					Proxy:               http.ProxyFromEnvironment,
 					TLSClientConfig: &tls.Config{
 						InsecureSkipVerify: true,
 					},
@@ -31,18 +38,19 @@ func GetHTTPClient(insecure bool) *http.Client {
 	}
 	if secureHTTPClient == nil {
 		secureHTTPClient = &http.Client{
-			Timeout: time.Second * 10,
+			Timeout: 10 * time.Second,
 			Transport: &http.Transport{
 				MaxIdleConns:        100,
 				MaxIdleConnsPerHost: 20,
+				Proxy:               http.ProxyFromEnvironment,
 			},
 		}
 	}
 	return secureHTTPClient
 }
 
-// CanCreateConnectionToTCPService checks whether a connection can be established with a TCP service
-func CanCreateConnectionToTCPService(address string) bool {
+// 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
@@ -50,3 +58,29 @@ func CanCreateConnectionToTCPService(address string) bool {
 	_ = 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

@@ -2,9 +2,10 @@ package client
 
 import (
 	"testing"
+	"time"
 )
 
-func TestGetHttpClient(t *testing.T) {
+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")
 	}
@@ -26,3 +27,25 @@ func TestGetHttpClient(t *testing.T) {
 		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

@@ -1,15 +1,37 @@
-metrics: true
 services:
-  - name: twinnation
+  - name: front-end
+    group: core
     url: "https://twinnation.org/health"
-    interval: 30s
+    interval: 1m
     conditions:
       - "[STATUS] == 200"
       - "[BODY].status == UP"
-      - "[RESPONSE_TIME] < 1000"
+      - "[RESPONSE_TIME] < 150"
+
+  - name: back-end
+    group: core
+    url: "http://example.org/"
+    interval: 5m
+    conditions:
+      - "[STATUS] == 200"
+
+  - 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: 1m
+    interval: 5m
     conditions:
       - "[STATUS] == 200"
       - "[BODY].deleted == false"

config/config.go

@@ -11,6 +11,8 @@ import (
 	"github.com/TwinProduction/gatus/core"
 	"github.com/TwinProduction/gatus/k8s"
 	"github.com/TwinProduction/gatus/security"
+	"github.com/TwinProduction/gatus/storage"
+	"github.com/TwinProduction/gatus/util"
 	"gopkg.in/yaml.v2"
 )
 
@@ -28,9 +30,6 @@ const (
 
 	// DefaultPort is the default port the service will listen on
 	DefaultPort = 8080
-
-	// DefaultContextRoot is the default context root of the web application
-	DefaultContextRoot = "/"
 )
 
 var (
@@ -74,8 +73,11 @@ type Config struct {
 	// Kubernetes is the Kubernetes configuration
 	Kubernetes *k8s.Config `yaml:"kubernetes"`
 
+	// Storage is the configuration for how the data is stored
+	Storage *storage.Config `yaml:"storage"`
+
 	// Web is the configuration for the web listener
-	Web *webConfig `yaml:"web"`
+	Web *WebConfig `yaml:"web"`
 }
 
 // Get returns the configuration, or panics if the configuration hasn't loaded yet
@@ -86,6 +88,12 @@ 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 {
@@ -141,13 +149,33 @@ func parseAndValidateConfigBytes(yamlBytes []byte) (config *Config, err error) {
 		validateServicesConfig(config)
 		validateKubernetesConfig(config)
 		validateWebConfig(config)
+		validateStorageConfig(config)
 	}
 	return
 }
 
+func validateStorageConfig(config *Config) {
+	if config.Storage == nil {
+		config.Storage = &storage.Config{}
+	}
+	err := storage.Initialize(config.Storage)
+	if err != nil {
+		panic(err)
+	}
+	// Remove all ServiceStatus that represent services which no longer exist in the configuration
+	var keys []string
+	for _, service := range config.Services {
+		keys = append(keys, util.ConvertGroupAndServiceToKey(service.Group, service.Name))
+	}
+	numberOfServiceStatusesDeleted := storage.Get().DeleteAllServiceStatusesNotInKeys(keys)
+	if numberOfServiceStatusesDeleted > 0 {
+		log.Printf("[config][validateStorageConfig] Deleted %d service statuses because their matching services no longer existed", numberOfServiceStatusesDeleted)
+	}
+}
+
 func validateWebConfig(config *Config) {
 	if config.Web == nil {
-		config.Web = &webConfig{Address: DefaultAddress, Port: DefaultPort, ContextRoot: DefaultContextRoot}
+		config.Web = &WebConfig{Address: DefaultAddress, Port: DefaultPort}
 	} else {
 		config.Web.validateAndSetDefaults()
 	}

config/config_test.go

@@ -17,6 +17,16 @@ func TestGetBeforeConfigIsLoaded(t *testing.T) {
 	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 {
@@ -32,7 +42,10 @@ func TestLoadDefaultConfigurationFile(t *testing.T) {
 }
 
 func TestParseAndValidateConfigBytes(t *testing.T) {
-	config, err := parseAndValidateConfigBytes([]byte(`
+	file := t.TempDir() + "/test.db"
+	config, err := parseAndValidateConfigBytes([]byte(fmt.Sprintf(`
+storage:
+  file: %s
 services:
   - name: twinnation
     url: https://twinnation.org/health
@@ -44,9 +57,9 @@ services:
     conditions:
       - "[STATUS] != 400"
       - "[STATUS] != 500"
-`))
+`, file)))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -89,7 +102,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -109,9 +122,6 @@ services:
 	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) {
@@ -125,7 +135,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -155,12 +165,12 @@ web:
   port: 12345
 services:
   - name: twinnation
-    url: https://twinnation.org/actuator/health
+    url: https://twinnation.org/health
     conditions:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -168,17 +178,15 @@ services:
 	if config.Metrics {
 		t.Error("Metrics should've been false by default")
 	}
-	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)
 	}
-
 	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)
 	}
@@ -196,7 +204,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -218,44 +226,6 @@ services:
 	}
 }
 
-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(`
@@ -271,17 +241,19 @@ services:
 	t.Fatal("Should've panicked because the configuration specifies an invalid port value")
 }
 
-func TestParseAndValidateConfigBytesWithMetrics(t *testing.T) {
+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")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -301,25 +273,25 @@ services:
 	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"
-web:
-  address: 192.168.0.1
-  port: 9090
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -327,17 +299,20 @@ web:
 	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 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 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)
 	}
 }
 
@@ -360,7 +335,6 @@ badconfig:
 func TestParseAndValidateConfigBytesWithAlerting(t *testing.T) {
 	config, err := parseAndValidateConfigBytes([]byte(`
 debug: true
-
 alerting:
   slack:
     webhook-url: "http://example.com"
@@ -387,7 +361,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -480,7 +454,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -514,7 +488,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -528,11 +502,106 @@ services:
 	if !config.Alerting.Custom.IsValid() {
 		t.Fatal("Custom alerting config should've been valid")
 	}
+	if config.Alerting.Custom.GetAlertStatePlaceholderValue(true) != "RESOLVED" {
+		t.Fatal("ALERT_TRIGGERED_OR_RESOLVED placeholder value for RESOLVED should've been 'RESOLVED', got", config.Alerting.Custom.GetAlertStatePlaceholderValue(true))
+	}
+	if config.Alerting.Custom.GetAlertStatePlaceholderValue(false) != "TRIGGERED" {
+		t.Fatal("ALERT_TRIGGERED_OR_RESOLVED placeholder value for TRIGGERED should've been 'TRIGGERED', got", config.Alerting.Custom.GetAlertStatePlaceholderValue(false))
+	}
 	if config.Alerting.Custom.Insecure {
 		t.Fatal("config.Alerting.Custom.Insecure shouldn't have been true")
 	}
 }
 
+func TestParseAndValidateConfigBytesWithCustomAlertingConfigAndCustomPlaceholderValues(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+alerting:
+  custom:
+    placeholders:
+      ALERT_TRIGGERED_OR_RESOLVED:
+        TRIGGERED: "partial_outage"
+        RESOLVED: "operational"
+    url: "https://example.com"
+    insecure: true
+    body: "[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("expected no error, got", err.Error())
+	}
+	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.GetAlertStatePlaceholderValue(true) != "operational" {
+		t.Fatal("ALERT_TRIGGERED_OR_RESOLVED placeholder value for RESOLVED should've been 'operational'")
+	}
+	if config.Alerting.Custom.GetAlertStatePlaceholderValue(false) != "partial_outage" {
+		t.Fatal("ALERT_TRIGGERED_OR_RESOLVED placeholder value for TRIGGERED should've been 'partial_outage'")
+	}
+	if !config.Alerting.Custom.Insecure {
+		t.Fatal("config.Alerting.Custom.Insecure shouldn't have been true")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithCustomAlertingConfigAndOneCustomPlaceholderValue(t *testing.T) {
+	config, err := parseAndValidateConfigBytes([]byte(`
+alerting:
+  custom:
+    placeholders:
+      ALERT_TRIGGERED_OR_RESOLVED:
+        TRIGGERED: "partial_outage"
+    url: "https://example.com"
+    insecure: true
+    body: "[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("expected no error, got", err.Error())
+	}
+	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.GetAlertStatePlaceholderValue(true) != "RESOLVED" {
+		t.Fatal("ALERT_TRIGGERED_OR_RESOLVED placeholder value for RESOLVED should've been 'RESOLVED'")
+	}
+	if config.Alerting.Custom.GetAlertStatePlaceholderValue(false) != "partial_outage" {
+		t.Fatal("ALERT_TRIGGERED_OR_RESOLVED placeholder value for TRIGGERED should've been 'partial_outage'")
+	}
+	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:
@@ -553,7 +622,7 @@ services:
       - "[STATUS] == 200"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -606,7 +675,7 @@ services:
       - "[STATUS] == 200"
 `, expectedUsername, expectedPasswordHash)))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
@@ -673,7 +742,7 @@ kubernetes:
       target-path: "/health"
 `))
 	if err != nil {
-		t.Error("No error should've been returned")
+		t.Error("expected no error, got", err.Error())
 	}
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")

config/web.go

@@ -3,25 +3,20 @@ package config
 import (
 	"fmt"
 	"math"
-	"net/url"
-	"strings"
 )
 
-// webConfig is the structure which supports the configuration of the endpoint
+// WebConfig is the structure which supports the configuration of the endpoint
 // which provides access to the web frontend
-type webConfig struct {
+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() {
+func (web *WebConfig) validateAndSetDefaults() {
 	// Validate the Address
 	if len(web.Address) == 0 {
 		web.Address = DefaultAddress
@@ -32,32 +27,9 @@ func (web *webConfig) validateAndSetDefaults() {
 	} 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 {
+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

@@ -1,12 +1,11 @@
 package config
 
 import (
-	"fmt"
 	"testing"
 )
 
 func TestWebConfig_SocketAddress(t *testing.T) {
-	web := &webConfig{
+	web := &WebConfig{
 		Address: "0.0.0.0",
 		Port:    8081,
 	}
@@ -14,88 +13,3 @@ func TestWebConfig_SocketAddress(t *testing.T) {
 		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/"},
-	{"Mutliple 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)
-		})
-	}
-}
-
-// 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))
-}
-
-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)
-	}
-}

controller/badge.go

@@ -0,0 +1,105 @@
+package controller
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/storage"
+	"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}: <KEY>.svg
+func badgeHandler(writer http.ResponseWriter, request *http.Request) {
+	variables := mux.Vars(request)
+	duration := variables["duration"]
+	if duration != "7d" && duration != "24h" && duration != "1h" {
+		writer.WriteHeader(http.StatusBadRequest)
+		_, _ = writer.Write([]byte("Durations supported: 7d, 24h, 1h"))
+		return
+	}
+	identifier := variables["identifier"]
+	key := strings.TrimSuffix(identifier, ".svg")
+	serviceStatus := storage.Get().GetServiceStatusByKey(key)
+	if serviceStatus == nil {
+		writer.WriteHeader(http.StatusNotFound)
+		_, _ = writer.Write([]byte("Requested service not found"))
+		return
+	}
+	if serviceStatus.Uptime == nil {
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte("Failed to compute uptime"))
+		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, serviceStatus.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 +1,171 @@
+package controller
+
+import (
+	"bytes"
+	"compress/gzip"
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/TwinProduction/gatus/config"
+	"github.com/TwinProduction/gatus/security"
+	"github.com/TwinProduction/gatus/storage"
+	"github.com/TwinProduction/gocache"
+	"github.com/TwinProduction/health"
+	"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)
+
+	// staticFolder is the path to the location of the static folder from the root path of the project
+	// The only reason this is exposed is to allow running tests from a different path than the root path of the project
+	staticFolder = "./web/static"
+
+	// server is the http.Server created by Handle.
+	// The only reason it exists is for testing purposes.
+	server *http.Server
+)
+
+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()
+	var router http.Handler = CreateRouter(cfg)
+	if os.Getenv("ENVIRONMENT") == "dev" {
+		router = developmentCorsHandler(router)
+	}
+	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.Println("[controller][Handle] Listening on " + cfg.Web.SocketAddress())
+	if os.Getenv("ROUTER_TEST") == "true" {
+		return
+	}
+	log.Println("[controller][Handle]", server.ListenAndServe())
+}
+
+// Shutdown stops the server
+func Shutdown() {
+	if server != nil {
+		_ = server.Shutdown(context.TODO())
+		server = nil
+	}
+}
+
+// CreateRouter creates the router for the http server
+func CreateRouter(cfg *config.Config) *mux.Router {
+	router := mux.NewRouter()
+	if cfg.Metrics {
+		router.Handle("/metrics", promhttp.Handler()).Methods("GET")
+	}
+	router.Handle("/health", health.Handler().WithJSON(true)).Methods("GET")
+	router.HandleFunc("/favicon.ico", favIconHandler).Methods("GET")
+	router.HandleFunc("/api/v1/statuses", secureIfNecessary(cfg, serviceStatusesHandler)).Methods("GET") // No GzipHandler for this one, because we cache the content
+	router.HandleFunc("/api/v1/statuses/{key}", secureIfNecessary(cfg, GzipHandlerFunc(serviceStatusHandler))).Methods("GET")
+	router.HandleFunc("/api/v1/badges/uptime/{duration}/{identifier}", badgeHandler).Methods("GET")
+	// SPA
+	router.HandleFunc("/services/{service}", spaHandler).Methods("GET")
+	// Everything else falls back on static content
+	router.PathPrefix("/").Handler(GzipHandler(http.FileServer(http.Dir(staticFolder))))
+	return router
+}
+
+func secureIfNecessary(cfg *config.Config, handler http.HandlerFunc) http.HandlerFunc {
+	if cfg.Security != nil && cfg.Security.IsValid() {
+		return security.Handler(handler, cfg.Security)
+	}
+	return handler
+}
+
+// serviceStatusesHandler handles requests to retrieve all service statuses
+// Due to the size of the response, this function leverages a cache.
+// Must not be wrapped by GzipHandler
+func serviceStatusesHandler(writer http.ResponseWriter, r *http.Request) {
+	page, pageSize := extractPageAndPageSizeFromRequest(r)
+	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(fmt.Sprintf("service-status-%d-%d-gzipped", page, pageSize))
+	} else {
+		value, exists = cache.Get(fmt.Sprintf("service-status-%d-%d", page, pageSize))
+	}
+	var data []byte
+	if !exists {
+		var err error
+		buffer := &bytes.Buffer{}
+		gzipWriter := gzip.NewWriter(buffer)
+		data, err = json.Marshal(storage.Get().GetAllServiceStatusesWithResultPagination(page, pageSize))
+		if err != nil {
+			log.Printf("[controller][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(fmt.Sprintf("service-status-%d-%d", page, pageSize), data, cacheTTL)
+		cache.SetWithTTL(fmt.Sprintf("service-status-%d-%d-gzipped", page, pageSize), gzippedData, cacheTTL)
+		if gzipped {
+			data = gzippedData
+		}
+	} else {
+		data = value.([]byte)
+	}
+	writer.Header().Add("Content-Type", "application/json")
+	writer.WriteHeader(http.StatusOK)
+	_, _ = writer.Write(data)
+}
+
+// serviceStatusHandler retrieves a single ServiceStatus by group name and service name
+func serviceStatusHandler(writer http.ResponseWriter, r *http.Request) {
+	page, pageSize := extractPageAndPageSizeFromRequest(r)
+	vars := mux.Vars(r)
+	serviceStatus := storage.Get().GetServiceStatusByKey(vars["key"])
+	if serviceStatus == nil {
+		log.Printf("[controller][serviceStatusHandler] Service with key=%s not found", vars["key"])
+		writer.WriteHeader(http.StatusNotFound)
+		_, _ = writer.Write([]byte("not found"))
+		return
+	}
+	data := map[string]interface{}{
+		"serviceStatus": serviceStatus.WithResultPagination(page, pageSize),
+		// The following fields, while present on core.ServiceStatus, are annotated to remain hidden so that we can
+		// expose only the necessary data on /api/v1/statuses.
+		// Since the /api/v1/statuses/{key} endpoint does need this data, however, we explicitly expose it here
+		"events": serviceStatus.Events,
+		"uptime": serviceStatus.Uptime,
+	}
+	output, err := json.Marshal(data)
+	if err != nil {
+		log.Printf("[controller][serviceStatusHandler] Unable to marshal object to JSON: %s", err.Error())
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte("unable to marshal object to JSON"))
+		return
+	}
+	writer.Header().Add("Content-Type", "application/json")
+	writer.WriteHeader(http.StatusOK)
+	_, _ = writer.Write(output)
+}

controller/controller_test.go

@@ -0,0 +1,333 @@
+package controller
+
+import (
+	"math/rand"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/TwinProduction/gatus/config"
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/storage"
+	"github.com/TwinProduction/gatus/watchdog"
+)
+
+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 TestCreateRouter(t *testing.T) {
+	defer storage.Get().Clear()
+	defer cache.Clear()
+	staticFolder = "../web/static"
+	cfg := &config.Config{
+		Metrics: true,
+		Services: []*core.Service{
+			{
+				Name:  "frontend",
+				Group: "core",
+			},
+			{
+				Name:  "backend",
+				Group: "core",
+			},
+		},
+	}
+	watchdog.UpdateServiceStatuses(cfg.Services[0], &core.Result{Success: true, Duration: time.Millisecond, Timestamp: time.Now()})
+	watchdog.UpdateServiceStatuses(cfg.Services[1], &core.Result{Success: false, Duration: time.Second, Timestamp: time.Now()})
+	router := CreateRouter(cfg)
+	type Scenario struct {
+		Name         string
+		Path         string
+		ExpectedCode int
+		Gzip         bool
+	}
+	scenarios := []Scenario{
+		{
+			Name:         "health",
+			Path:         "/health",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "metrics",
+			Path:         "/metrics",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "badges-1h",
+			Path:         "/api/v1/badges/uptime/1h/core_frontend.svg",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "badges-24h",
+			Path:         "/api/v1/badges/uptime/24h/core_backend.svg",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "badges-7d",
+			Path:         "/api/v1/badges/uptime/7d/core_frontend.svg",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "badges-with-invalid-duration",
+			Path:         "/api/v1/badges/uptime/3d/core_backend.svg",
+			ExpectedCode: http.StatusBadRequest,
+		},
+		{
+			Name:         "badges-for-invalid-key",
+			Path:         "/api/v1/badges/uptime/7d/invalid_key.svg",
+			ExpectedCode: http.StatusNotFound,
+		},
+		{
+			Name:         "service-statuses",
+			Path:         "/api/v1/statuses",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "service-statuses-gzip",
+			Path:         "/api/v1/statuses",
+			ExpectedCode: http.StatusOK,
+			Gzip:         true,
+		},
+		{
+			Name:         "service-statuses-pagination",
+			Path:         "/api/v1/statuses?page=1&pageSize=20",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "service-status",
+			Path:         "/api/v1/statuses/core_frontend",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "service-status-gzip",
+			Path:         "/api/v1/statuses/core_frontend",
+			ExpectedCode: http.StatusOK,
+			Gzip:         true,
+		},
+		{
+			Name:         "service-status-for-invalid-key",
+			Path:         "/api/v1/statuses/invalid_key",
+			ExpectedCode: http.StatusNotFound,
+		},
+		{
+			Name:         "favicon",
+			Path:         "/favicon.ico",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "frontend-home",
+			Path:         "/",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "frontend-assets",
+			Path:         "/js/app.js",
+			ExpectedCode: http.StatusOK,
+		},
+		{
+			Name:         "frontend-service",
+			Path:         "/services/core_frontend",
+			ExpectedCode: http.StatusOK,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			request, _ := http.NewRequest("GET", scenario.Path, nil)
+			if scenario.Gzip {
+				request.Header.Set("Accept-Encoding", "gzip")
+			}
+			responseRecorder := httptest.NewRecorder()
+			router.ServeHTTP(responseRecorder, request)
+			if responseRecorder.Code != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
+			}
+		})
+	}
+}
+
+func TestHandle(t *testing.T) {
+	defer storage.Get().Clear()
+	defer cache.Clear()
+	cfg := &config.Config{
+		Web: &config.WebConfig{
+			Address: "0.0.0.0",
+			Port:    rand.Intn(65534),
+		},
+		Services: []*core.Service{
+			{
+				Name:  "frontend",
+				Group: "core",
+			},
+			{
+				Name:  "backend",
+				Group: "core",
+			},
+		},
+	}
+	config.Set(cfg)
+	defer config.Set(nil)
+	_ = os.Setenv("ROUTER_TEST", "true")
+	_ = os.Setenv("ENVIRONMENT", "dev")
+	defer os.Clearenv()
+	Handle()
+	defer Shutdown()
+	request, _ := http.NewRequest("GET", "/health", nil)
+	responseRecorder := httptest.NewRecorder()
+	server.Handler.ServeHTTP(responseRecorder, request)
+	if responseRecorder.Code != http.StatusOK {
+		t.Error("expected GET /health to return status code 200")
+	}
+	if server == nil {
+		t.Fatal("server should've been set (but because we set ROUTER_TEST, it shouldn't have been started)")
+	}
+}
+
+func TestShutdown(t *testing.T) {
+	// Pretend that we called controller.Handle(), which initializes the server variable
+	server = &http.Server{}
+	Shutdown()
+	if server != nil {
+		t.Error("server should've been shut down")
+	}
+}
+
+func TestServiceStatusesHandler(t *testing.T) {
+	defer storage.Get().Clear()
+	defer cache.Clear()
+	staticFolder = "../web/static"
+	firstResult := &testSuccessfulResult
+	secondResult := &testUnsuccessfulResult
+	storage.Get().Insert(&testService, firstResult)
+	storage.Get().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{}
+	router := CreateRouter(&config.Config{})
+
+	type Scenario struct {
+		Name         string
+		Path         string
+		ExpectedCode int
+		ExpectedBody string
+	}
+	scenarios := []Scenario{
+		{
+			Name:         "no-pagination",
+			Path:         "/api/v1/statuses",
+			ExpectedCode: http.StatusOK,
+			ExpectedBody: `{"group_name":{"name":"name","group":"group","key":"group_name","results":[{"status":200,"hostname":"example.org","duration":150000000,"errors":null,"conditionResults":[{"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"],"conditionResults":[{"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"}]}}`,
+		},
+		{
+			Name:         "pagination-first-result",
+			Path:         "/api/v1/statuses?page=1&pageSize=1",
+			ExpectedCode: http.StatusOK,
+			ExpectedBody: `{"group_name":{"name":"name","group":"group","key":"group_name","results":[{"status":200,"hostname":"example.org","duration":750000000,"errors":["error-1","error-2"],"conditionResults":[{"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"}]}}`,
+		},
+		{
+			Name:         "pagination-second-result",
+			Path:         "/api/v1/statuses?page=2&pageSize=1",
+			ExpectedCode: http.StatusOK,
+			ExpectedBody: `{"group_name":{"name":"name","group":"group","key":"group_name","results":[{"status":200,"hostname":"example.org","duration":150000000,"errors":null,"conditionResults":[{"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"}]}}`,
+		},
+		{
+			Name:         "pagination-no-results",
+			Path:         "/api/v1/statuses?page=5&pageSize=20",
+			ExpectedCode: http.StatusOK,
+			ExpectedBody: `{"group_name":{"name":"name","group":"group","key":"group_name","results":[]}}`,
+		},
+		{
+			Name:         "invalid-pagination-should-fall-back-to-default",
+			Path:         "/api/v1/statuses?page=INVALID&pageSize=INVALID",
+			ExpectedCode: http.StatusOK,
+			ExpectedBody: `{"group_name":{"name":"name","group":"group","key":"group_name","results":[{"status":200,"hostname":"example.org","duration":150000000,"errors":null,"conditionResults":[{"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"],"conditionResults":[{"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"}]}}`,
+		},
+	}
+
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			request, _ := http.NewRequest("GET", scenario.Path, nil)
+			responseRecorder := httptest.NewRecorder()
+			router.ServeHTTP(responseRecorder, request)
+			if responseRecorder.Code != scenario.ExpectedCode {
+				t.Errorf("%s %s should have returned %d, but returned %d instead", request.Method, request.URL, scenario.ExpectedCode, responseRecorder.Code)
+			}
+			output := responseRecorder.Body.String()
+			if output != scenario.ExpectedBody {
+				t.Errorf("expected:\n %s\n\ngot:\n %s", scenario.ExpectedBody, output)
+			}
+		})
+	}
+}

controller/cors.go

@@ -0,0 +1,10 @@
+package controller
+
+import "net/http"
+
+func developmentCorsHandler(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:8081")
+		next.ServeHTTP(w, r)
+	})
+}

controller/favicon.go

@@ -0,0 +1,8 @@
+package controller
+
+import "net/http"
+
+// favIconHandler handles requests for /favicon.ico
+func favIconHandler(writer http.ResponseWriter, request *http.Request) {
+	http.ServeFile(writer, request, staticFolder+"/favicon.ico")
+}

controller/gzip.go

@@ -1,4 +1,4 @@
-package main
+package controller
 
 import (
 	"compress/gzip"
@@ -20,19 +20,30 @@ 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
+// GzipHandler compresses the response of a given http.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) {
+	return GzipHandlerFunc(func(writer http.ResponseWriter, r *http.Request) {
+		next.ServeHTTP(writer, r)
+	})
+}
+
+// GzipHandlerFunc compresses the response of a given http.HandlerFunc if the request's headers specify that the client
+// supports gzip encoding
+func GzipHandlerFunc(next http.HandlerFunc) http.HandlerFunc {
+	return func(writer http.ResponseWriter, r *http.Request) {
 		// If the request doesn't specify that it supports gzip, then don't compress it
 		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
 			next.ServeHTTP(writer, r)
@@ -44,5 +55,5 @@ func GzipHandler(next http.Handler) http.Handler {
 		gz.Reset(writer)
 		defer gz.Close()
 		next.ServeHTTP(&gzipResponseWriter{ResponseWriter: writer, Writer: gz}, r)
-	})
+	}
 }

controller/spa.go

@@ -0,0 +1,8 @@
+package controller
+
+import "net/http"
+
+// spaHandler handles requests for /
+func spaHandler(writer http.ResponseWriter, request *http.Request) {
+	http.ServeFile(writer, request, staticFolder+"/index.html")
+}

controller/util.go

@@ -0,0 +1,46 @@
+package controller
+
+import (
+	"net/http"
+	"strconv"
+)
+
+const (
+	// DefaultPage is the default page to use if none is specified or an invalid value is provided
+	DefaultPage = 1
+
+	// DefaultPageSize is the default page siZE to use if none is specified or an invalid value is provided
+	DefaultPageSize = 20
+
+	// MaximumPageSize is the maximum page size allowed
+	MaximumPageSize = 100
+)
+
+func extractPageAndPageSizeFromRequest(r *http.Request) (page int, pageSize int) {
+	var err error
+	if pageParameter := r.URL.Query().Get("page"); len(pageParameter) == 0 {
+		page = DefaultPage
+	} else {
+		page, err = strconv.Atoi(pageParameter)
+		if err != nil {
+			page = DefaultPage
+		}
+		if page < 1 {
+			page = DefaultPage
+		}
+	}
+	if pageSizeParameter := r.URL.Query().Get("pageSize"); len(pageSizeParameter) == 0 {
+		pageSize = DefaultPageSize
+	} else {
+		pageSize, err = strconv.Atoi(pageSizeParameter)
+		if err != nil {
+			pageSize = DefaultPageSize
+		}
+		if pageSize > MaximumPageSize {
+			pageSize = MaximumPageSize
+		} else if pageSize < 1 {
+			pageSize = DefaultPageSize
+		}
+	}
+	return
+}

controller/util_test.go

@@ -0,0 +1,67 @@
+package controller
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+)
+
+func TestExtractPageAndPageSizeFromRequest(t *testing.T) {
+	type Scenario struct {
+		Name             string
+		Page             string
+		PageSize         string
+		ExpectedPage     int
+		ExpectedPageSize int
+	}
+	scenarios := []Scenario{
+		{
+			Page:             "1",
+			PageSize:         "20",
+			ExpectedPage:     1,
+			ExpectedPageSize: 20,
+		},
+		{
+			Page:             "2",
+			PageSize:         "10",
+			ExpectedPage:     2,
+			ExpectedPageSize: 10,
+		},
+		{
+			Page:             "2",
+			PageSize:         "10",
+			ExpectedPage:     2,
+			ExpectedPageSize: 10,
+		},
+		{
+			Page:             "1",
+			PageSize:         "999999",
+			ExpectedPage:     1,
+			ExpectedPageSize: MaximumPageSize,
+		},
+		{
+			Page:             "-1",
+			PageSize:         "-1",
+			ExpectedPage:     DefaultPage,
+			ExpectedPageSize: DefaultPageSize,
+		},
+		{
+			Page:             "invalid",
+			PageSize:         "invalid",
+			ExpectedPage:     DefaultPage,
+			ExpectedPageSize: DefaultPageSize,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run("page-"+scenario.Page+"-pageSize-"+scenario.PageSize, func(t *testing.T) {
+			request, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/statuses?page=%s&pageSize=%s", scenario.Page, scenario.PageSize), nil)
+			actualPage, actualPageSize := extractPageAndPageSizeFromRequest(request)
+			if actualPage != scenario.ExpectedPage {
+				t.Errorf("expected %d, got %d", scenario.ExpectedPage, actualPage)
+			}
+			if actualPageSize != scenario.ExpectedPageSize {
+				t.Errorf("expected %d, got %d", scenario.ExpectedPageSize, actualPageSize)
+			}
+		})
+	}
+}

core/alert.go

@@ -26,6 +26,12 @@ type Alert struct {
 
 	// 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.
+	//
+	// This value should only be modified if the provider.AlertProvider's Send function does not return an error for an
+	// alert that hasn't been triggered yet. This doubles as a lazy retry. The reason why this behavior isn't also
+	// applied for alerts that are already triggered and has become "healthy" again is to prevent a case where, for
+	// some reason, the alert provider always returns errors when trying to send the resolved notification
+	// (SendOnResolved).
 	Triggered bool
 }
 

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

@@ -2,7 +2,6 @@ package core
 
 import (
 	"fmt"
-	"log"
 	"strconv"
 	"strings"
 	"time"
@@ -48,11 +47,20 @@ const (
 	CertificateExpirationPlaceholder = "[CERTIFICATE_EXPIRATION]"
 
 	// LengthFunctionPrefix is the prefix for the length function
+	//
+	// Usage: len([BODY].articles) == 10, len([BODY].name) > 5
 	LengthFunctionPrefix = "len("
 
 	// PatternFunctionPrefix is the prefix for the pattern function
+	//
+	// Usage: pat(192.168.*.*)
 	PatternFunctionPrefix = "pat("
 
+	// AnyFunctionPrefix is the prefix for the any function
+	//
+	// Usage: any(1.1.1.1, 1.0.0.1)
+	AnyFunctionPrefix = "any("
+
 	// FunctionSuffix is the suffix for all functions
 	FunctionSuffix = ")"
 
@@ -64,51 +72,52 @@ const (
 type Condition string
 
 // evaluate the Condition with the Result of the health check
-func (c *Condition) evaluate(result *Result) bool {
-	condition := string(*c)
+func (c Condition) evaluate(result *Result) bool {
+	condition := string(c)
 	success := false
-	var resolvedCondition string
+	conditionToDisplay := condition
 	if strings.Contains(condition, "==") {
-		parts := sanitizeAndResolve(strings.Split(condition, "=="), result)
-		success = isEqual(parts[0], parts[1])
-		resolvedCondition = fmt.Sprintf("%v == %v", parts[0], parts[1])
+		parameters, resolvedParameters := sanitizeAndResolve(strings.Split(condition, "=="), result)
+		success = isEqual(resolvedParameters[0], resolvedParameters[1])
+		if !success {
+			conditionToDisplay = prettify(parameters, resolvedParameters, "==")
+		}
 	} else if strings.Contains(condition, "!=") {
-		parts := sanitizeAndResolve(strings.Split(condition, "!="), result)
-		success = !isEqual(parts[0], parts[1])
-		resolvedCondition = fmt.Sprintf("%v != %v", parts[0], parts[1])
+		parameters, resolvedParameters := sanitizeAndResolve(strings.Split(condition, "!="), result)
+		success = !isEqual(resolvedParameters[0], resolvedParameters[1])
+		if !success {
+			conditionToDisplay = prettify(parameters, resolvedParameters, "!=")
+		}
 	} else if strings.Contains(condition, "<=") {
-		parts := sanitizeAndResolveNumerical(strings.Split(condition, "<="), result)
-		success = parts[0] <= parts[1]
-		resolvedCondition = fmt.Sprintf("%v <= %v", parts[0], parts[1])
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, "<="), result)
+		success = resolvedParameters[0] <= resolvedParameters[1]
+		if !success {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, "<=")
+		}
 	} else if strings.Contains(condition, ">=") {
-		parts := sanitizeAndResolveNumerical(strings.Split(condition, ">="), result)
-		success = parts[0] >= parts[1]
-		resolvedCondition = fmt.Sprintf("%v >= %v", parts[0], parts[1])
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, ">="), result)
+		success = resolvedParameters[0] >= resolvedParameters[1]
+		if !success {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, ">=")
+		}
 	} else if strings.Contains(condition, ">") {
-		parts := sanitizeAndResolveNumerical(strings.Split(condition, ">"), result)
-		success = parts[0] > parts[1]
-		resolvedCondition = fmt.Sprintf("%v > %v", parts[0], parts[1])
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, ">"), result)
+		success = resolvedParameters[0] > resolvedParameters[1]
+		if !success {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, ">")
+		}
 	} else if strings.Contains(condition, "<") {
-		parts := sanitizeAndResolveNumerical(strings.Split(condition, "<"), result)
-		success = parts[0] < parts[1]
-		resolvedCondition = fmt.Sprintf("%v < %v", parts[0], parts[1])
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, "<"), result)
+		success = resolvedParameters[0] < resolvedParameters[1]
+		if !success {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, "<")
+		}
 	} else {
 		result.Errors = append(result.Errors, fmt.Sprintf("invalid condition '%s' has been provided", condition))
 		return false
 	}
-	conditionToDisplay := condition
-	// 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)
-		// 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)
-		}
+		//log.Printf("[Condition][evaluate] Condition '%s' did not succeed because '%s' is false", condition, condition)
 	}
 	result.ConditionResults = append(result.ConditionResults, &ConditionResult{Condition: conditionToDisplay, Success: success})
 	return success
@@ -116,33 +125,66 @@ func (c *Condition) evaluate(result *Result) bool {
 
 // 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.
+// Supports the pattern and the any functions.
+// i.e. if one of the parameters 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
+	firstHasFunctionSuffix := strings.HasSuffix(first, FunctionSuffix)
+	secondHasFunctionSuffix := strings.HasSuffix(second, FunctionSuffix)
+	if firstHasFunctionSuffix || secondHasFunctionSuffix {
+		var isFirstPattern, isSecondPattern bool
+		if strings.HasPrefix(first, PatternFunctionPrefix) && firstHasFunctionSuffix {
+			isFirstPattern = true
+			first = strings.TrimSuffix(strings.TrimPrefix(first, PatternFunctionPrefix), FunctionSuffix)
+		}
+		if strings.HasPrefix(second, PatternFunctionPrefix) && secondHasFunctionSuffix {
+			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)
+		}
+		var isFirstAny, isSecondAny bool
+		if strings.HasPrefix(first, AnyFunctionPrefix) && firstHasFunctionSuffix {
+			isFirstAny = true
+			first = strings.TrimSuffix(strings.TrimPrefix(first, AnyFunctionPrefix), FunctionSuffix)
+		}
+		if strings.HasPrefix(second, AnyFunctionPrefix) && secondHasFunctionSuffix {
+			isSecondAny = true
+			second = strings.TrimSuffix(strings.TrimPrefix(second, AnyFunctionPrefix), FunctionSuffix)
+		}
+		if isFirstAny && !isSecondAny {
+			options := strings.Split(first, ",")
+			for _, option := range options {
+				if strings.TrimSpace(option) == second {
+					return true
+				}
+			}
+			return false
+		} else if !isFirstAny && isSecondAny {
+			options := strings.Split(second, ",")
+			for _, option := range options {
+				if strings.TrimSpace(option) == first {
+					return true
+				}
+			}
+			return false
+		}
 	}
+	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
+// sanitizeAndResolve sanitizes and resolves a list of elements and returns the list of parameters as well as a list
+// of resolved parameters
+func sanitizeAndResolve(elements []string, result *Result) ([]string, []string) {
+	parameters := make([]string, len(elements))
+	resolvedParameters := make([]string, len(elements))
 	body := strings.TrimSpace(string(result.Body))
-	for _, element := range list {
+	for i, element := range elements {
 		element = strings.TrimSpace(element)
+		parameters[i] = element
 		switch strings.ToUpper(element) {
 		case StatusPlaceholder:
 			element = strconv.Itoa(result.HTTPStatus)
@@ -166,42 +208,68 @@ func sanitizeAndResolve(list []string, result *Result) []string {
 					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)
+				resolvedElement, resolvedElementLength, err := jsonpath.Eval(strings.TrimPrefix(element, BodyPlaceholder+"."), 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("len(%s) %s", element, InvalidConditionElementSuffix)
+						element = LengthFunctionPrefix + element + FunctionSuffix + " " + InvalidConditionElementSuffix
 					} else {
-						element = fmt.Sprintf("%s %s", element, InvalidConditionElementSuffix)
+						element = element + " " + InvalidConditionElementSuffix
 					}
 				} else {
 					if wantLength {
-						element = fmt.Sprintf("%d", resolvedElementLength)
+						element = strconv.Itoa(resolvedElementLength)
 					} else {
 						element = resolvedElement
 					}
 				}
 			}
 		}
-		sanitizedList = append(sanitizedList, element)
+		resolvedParameters[i] = element
 	}
-	return sanitizedList
+	return parameters, resolvedParameters
 }
 
-func sanitizeAndResolveNumerical(list []string, result *Result) []int64 {
-	var sanitizedNumbers []int64
-	sanitizedList := sanitizeAndResolve(list, result)
-	for _, element := range sanitizedList {
+func sanitizeAndResolveNumerical(list []string, result *Result) (parameters []string, resolvedNumericalParameters []int64) {
+	parameters, resolvedParameters := sanitizeAndResolve(list, result)
+	for _, element := range resolvedParameters {
 		if duration, err := time.ParseDuration(element); duration != 0 && err == nil {
-			sanitizedNumbers = append(sanitizedNumbers, duration.Milliseconds())
+			resolvedNumericalParameters = append(resolvedNumericalParameters, 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)
+			resolvedNumericalParameters = append(resolvedNumericalParameters, 0)
 		} else {
-			sanitizedNumbers = append(sanitizedNumbers, number)
+			resolvedNumericalParameters = append(resolvedNumericalParameters, number)
 		}
 	}
-	return sanitizedNumbers
+	return parameters, resolvedNumericalParameters
+}
+
+func prettifyNumericalParameters(parameters []string, resolvedParameters []int64, operator string) string {
+	return prettify(parameters, []string{strconv.Itoa(int(resolvedParameters[0])), strconv.Itoa(int(resolvedParameters[1]))}, operator)
+}
+
+// XXX: make this configurable? i.e. show-resolved-conditions-on-failure
+func prettify(parameters []string, resolvedParameters []string, operator string) string {
+	// Since, in the event of an invalid path, the resolvedParameters also contain the condition itself,
+	// we'll return the resolvedParameters as-is.
+	if strings.HasSuffix(resolvedParameters[0], InvalidConditionElementSuffix) || strings.HasSuffix(resolvedParameters[1], InvalidConditionElementSuffix) {
+		return resolvedParameters[0] + " " + operator + " " + resolvedParameters[1]
+	}
+	// First element is a placeholder
+	if parameters[0] != resolvedParameters[0] && parameters[1] == resolvedParameters[1] {
+		return parameters[0] + " (" + resolvedParameters[0] + ") " + operator + " " + parameters[1]
+	}
+	// Second element is a placeholder
+	if parameters[0] == resolvedParameters[0] && parameters[1] != resolvedParameters[1] {
+		return parameters[0] + " " + operator + " " + parameters[1] + " (" + resolvedParameters[1] + ")"
+	}
+	// Both elements are placeholders...?
+	if parameters[0] != resolvedParameters[0] && parameters[1] != resolvedParameters[1] {
+		return parameters[0] + " (" + resolvedParameters[0] + ") " + operator + " " + parameters[1] + " (" + resolvedParameters[1] + ")"
+	}
+	// Neither elements are placeholders
+	return parameters[0] + " " + operator + " " + parameters[1]
 }

core/condition_bench_test.go

@@ -0,0 +1,75 @@
+package core
+
+import "testing"
+
+func BenchmarkCondition_evaluateWithBodyStringAny(b *testing.B) {
+	condition := Condition("[BODY].name == any(john.doe, jane.doe)")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringAnyFailure(b *testing.B) {
+	condition := Condition("[BODY].name == any(john.doe, jane.doe)")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyString(b *testing.B) {
+	condition := Condition("[BODY].name == john.doe")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringFailure(b *testing.B) {
+	condition := Condition("[BODY].name == john.doe")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringLen(b *testing.B) {
+	condition := Condition("len([BODY].name) == 8")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringLenFailure(b *testing.B) {
+	condition := Condition("len([BODY].name) == 8")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithStatus(b *testing.B) {
+	condition := Condition("[STATUS] == 200")
+	for n := 0; n < b.N; n++ {
+		result := &Result{HTTPStatus: 200}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithStatusFailure(b *testing.B) {
+	condition := Condition("[STATUS] == 200")
+	for n := 0; n < b.N; n++ {
+		result := &Result{HTTPStatus: 400}
+		condition.evaluate(result)
+	}
+	b.ReportAllocs()
+}

core/condition_test.go

@@ -1,6 +1,7 @@
 package core
 
 import (
+	"fmt"
 	"strconv"
 	"testing"
 	"time"
@@ -22,6 +23,9 @@ func TestCondition_evaluateWithStatus(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	if result.ConditionResults[0].Condition != string(condition) {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, condition, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithStatusFailure(t *testing.T) {
@@ -31,6 +35,10 @@ func TestCondition_evaluateWithStatusFailure(t *testing.T) {
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[STATUS] (500) == 200"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithStatusUsingLessThan(t *testing.T) {
@@ -40,6 +48,10 @@ func TestCondition_evaluateWithStatusUsingLessThan(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[STATUS] < 300"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithStatusFailureUsingLessThan(t *testing.T) {
@@ -49,6 +61,10 @@ func TestCondition_evaluateWithStatusFailureUsingLessThan(t *testing.T) {
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[STATUS] (404) < 300"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingLessThan(t *testing.T) {
@@ -58,6 +74,10 @@ func TestCondition_evaluateWithResponseTimeUsingLessThan(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] < 500"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingLessThanDuration(t *testing.T) {
@@ -67,6 +87,10 @@ func TestCondition_evaluateWithResponseTimeUsingLessThanDuration(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] < 1s"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingLessThanInvalid(t *testing.T) {
@@ -76,6 +100,10 @@ func TestCondition_evaluateWithResponseTimeUsingLessThanInvalid(t *testing.T) {
 	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)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] (50) < potato (0)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingGreaterThan(t *testing.T) {
@@ -87,6 +115,10 @@ func TestCondition_evaluateWithResponseTimeUsingGreaterThan(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] > 500"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingGreaterThanDuration(t *testing.T) {
@@ -96,6 +128,10 @@ func TestCondition_evaluateWithResponseTimeUsingGreaterThanDuration(t *testing.T
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] > 1s"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingGreaterThanOrEqualTo(t *testing.T) {
@@ -105,6 +141,10 @@ func TestCondition_evaluateWithResponseTimeUsingGreaterThanOrEqualTo(t *testing.
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] >= 500"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithResponseTimeUsingLessThanOrEqualTo(t *testing.T) {
@@ -114,6 +154,10 @@ func TestCondition_evaluateWithResponseTimeUsingLessThanOrEqualTo(t *testing.T)
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[RESPONSE_TIME] <= 500"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBody(t *testing.T) {
@@ -123,6 +167,10 @@ func TestCondition_evaluateWithBody(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY] == test"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPath(t *testing.T) {
@@ -132,6 +180,10 @@ func TestCondition_evaluateWithBodyJSONPath(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].status == UP"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathComplex(t *testing.T) {
@@ -141,31 +193,35 @@ func TestCondition_evaluateWithBodyJSONPathComplex(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data.name == john"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 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)
+	expectedConditionDisplayed := "[BODY].data.name (INVALID) == john"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, 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)
+	expectedConditionDisplayed := "len([BODY].data.name) (INVALID) == john"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
 	}
 }
 
@@ -176,6 +232,10 @@ func TestCondition_evaluateWithBodyJSONPathDoublePlaceholders(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].user.firstName != [BODY].user.lastName"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathDoublePlaceholdersFailure(t *testing.T) {
@@ -185,6 +245,10 @@ func TestCondition_evaluateWithBodyJSONPathDoublePlaceholdersFailure(t *testing.
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[BODY].user.firstName (john) == [BODY].user.lastName (doe)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathLongInt(t *testing.T) {
@@ -194,6 +258,10 @@ func TestCondition_evaluateWithBodyJSONPathLongInt(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data.id == 1"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathComplexInt(t *testing.T) {
@@ -203,6 +271,10 @@ func TestCondition_evaluateWithBodyJSONPathComplexInt(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data[1].id == 2"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathComplexIntUsingGreaterThan(t *testing.T) {
@@ -212,6 +284,10 @@ func TestCondition_evaluateWithBodyJSONPathComplexIntUsingGreaterThan(t *testing
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data.id > 0"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathComplexIntFailureUsingGreaterThan(t *testing.T) {
@@ -221,6 +297,10 @@ func TestCondition_evaluateWithBodyJSONPathComplexIntFailureUsingGreaterThan(t *
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data.id (1) > 5"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathComplexIntUsingLessThan(t *testing.T) {
@@ -230,6 +310,10 @@ func TestCondition_evaluateWithBodyJSONPathComplexIntUsingLessThan(t *testing.T)
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data.id < 5"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyJSONPathComplexIntFailureUsingLessThan(t *testing.T) {
@@ -239,6 +323,10 @@ func TestCondition_evaluateWithBodyJSONPathComplexIntFailureUsingLessThan(t *tes
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[BODY].data.id (10) < 5"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodySliceLength(t *testing.T) {
@@ -248,6 +336,10 @@ func TestCondition_evaluateWithBodySliceLength(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "len([BODY].data) == 3"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyStringLength(t *testing.T) {
@@ -257,6 +349,36 @@ func TestCondition_evaluateWithBodyStringLength(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "len([BODY].name) == 8"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyPattern(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)
+	}
+	expectedConditionDisplayed := "[BODY] == pat(*john*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithReverseBodyPattern(t *testing.T) {
+	condition := Condition("pat(*john*) == [BODY]")
+	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)
+	}
+	expectedConditionDisplayed := "pat(*john*) == [BODY]"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyStringPattern(t *testing.T) {
@@ -266,6 +388,24 @@ func TestCondition_evaluateWithBodyStringPattern(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[BODY].name == pat(*ohn*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyHTMLPattern(t *testing.T) {
+	var html = `<!DOCTYPE html><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body><div id="user">john.doe</div></body></html>`
+	condition := Condition("[BODY] == pat(*<div id=\"user\">john.doe</div>*)")
+	result := &Result{Body: []byte(html)}
+	condition.evaluate(result)
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+	expectedConditionDisplayed := "[BODY] == pat(*<div id=\"user\">john.doe</div>*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithBodyStringPatternFailure(t *testing.T) {
@@ -275,14 +415,9 @@ func TestCondition_evaluateWithBodyStringPatternFailure(t *testing.T) {
 	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)
+	expectedConditionDisplayed := "[BODY].name (john.doe) == pat(bob*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
 	}
 }
 
@@ -293,6 +428,10 @@ func TestCondition_evaluateWithIPPattern(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[IP] == pat(10.*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithIPPatternFailure(t *testing.T) {
@@ -302,6 +441,10 @@ func TestCondition_evaluateWithIPPatternFailure(t *testing.T) {
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[IP] (255.255.255.255) == pat(10.*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithStatusPattern(t *testing.T) {
@@ -311,6 +454,10 @@ func TestCondition_evaluateWithStatusPattern(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[STATUS] == pat(4*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithStatusPatternFailure(t *testing.T) {
@@ -320,6 +467,105 @@ func TestCondition_evaluateWithStatusPatternFailure(t *testing.T) {
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[STATUS] (404) != pat(4*)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithBodyStringAny(t *testing.T) {
+	condition := Condition("[BODY].name == any(john.doe, jane.doe)")
+	expectedConditionDisplayed := "[BODY].name == any(john.doe, jane.doe)"
+	results := []*Result{
+		{Body: []byte("{\"name\": \"john.doe\"}")},
+		{Body: []byte("{\"name\": \"jane.doe\"}")},
+	}
+	for _, result := range results {
+		success := condition.evaluate(result)
+		if !success || !result.ConditionResults[0].Success {
+			t.Errorf("Condition '%s' should have been a success", condition)
+		}
+		if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+			t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+		}
+	}
+}
+
+func TestCondition_evaluateWithBodyStringAnyFailure(t *testing.T) {
+	condition := Condition("[BODY].name == any(john.doe, jane.doe)")
+	result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure", condition)
+	}
+	expectedConditionDisplayed := "[BODY].name (bob.doe) == any(john.doe, jane.doe)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
+}
+
+func TestCondition_evaluateWithStatusAny(t *testing.T) {
+	condition := Condition("[STATUS] == any(200, 429)")
+	statuses := []int{200, 429}
+	for _, status := range statuses {
+		result := &Result{HTTPStatus: status}
+		condition.evaluate(result)
+		if !result.ConditionResults[0].Success {
+			t.Errorf("Condition '%s' should have been a success", condition)
+		}
+		expectedConditionDisplayed := "[STATUS] == any(200, 429)"
+		if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+			t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+		}
+	}
+}
+
+func TestCondition_evaluateWithReverseStatusAny(t *testing.T) {
+	condition := Condition("any(200, 429) == [STATUS]")
+	statuses := []int{200, 429}
+	for _, status := range statuses {
+		result := &Result{HTTPStatus: status}
+		condition.evaluate(result)
+		if !result.ConditionResults[0].Success {
+			t.Errorf("Condition '%s' should have been a success", condition)
+		}
+		expectedConditionDisplayed := "any(200, 429) == [STATUS]"
+		if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+			t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+		}
+	}
+}
+
+func TestCondition_evaluateWithStatusAnyFailure(t *testing.T) {
+	condition := Condition("[STATUS] == any(200, 429)")
+	statuses := []int{201, 400, 404, 500}
+	for _, status := range statuses {
+		result := &Result{HTTPStatus: status}
+		condition.evaluate(result)
+		if result.ConditionResults[0].Success {
+			t.Errorf("Condition '%s' should have been a failure", condition)
+		}
+		expectedConditionDisplayed := fmt.Sprintf("[STATUS] (%d) == any(200, 429)", status)
+		if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+			t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+		}
+	}
+}
+
+func TestCondition_evaluateWithReverseStatusAnyFailure(t *testing.T) {
+	condition := Condition("any(200, 429) == [STATUS]")
+	statuses := []int{201, 400, 404, 500}
+	for _, status := range statuses {
+		result := &Result{HTTPStatus: status}
+		condition.evaluate(result)
+		if result.ConditionResults[0].Success {
+			t.Errorf("Condition '%s' should have been a failure", condition)
+		}
+		expectedConditionDisplayed := fmt.Sprintf("any(200, 429) == [STATUS] (%d)", status)
+		if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+			t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+		}
+	}
 }
 
 func TestCondition_evaluateWithConnected(t *testing.T) {
@@ -329,6 +575,10 @@ func TestCondition_evaluateWithConnected(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[CONNECTED] == true"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithConnectedFailure(t *testing.T) {
@@ -338,6 +588,10 @@ func TestCondition_evaluateWithConnectedFailure(t *testing.T) {
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[CONNECTED] (false) == true"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithUnsetCertificateExpiration(t *testing.T) {
@@ -347,6 +601,10 @@ func TestCondition_evaluateWithUnsetCertificateExpiration(t *testing.T) {
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[CERTIFICATE_EXPIRATION] == 0"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithCertificateExpirationGreaterThanNumerical(t *testing.T) {
@@ -357,6 +615,10 @@ func TestCondition_evaluateWithCertificateExpirationGreaterThanNumerical(t *test
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[CERTIFICATE_EXPIRATION] > 2419200000"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithCertificateExpirationGreaterThanNumericalFailure(t *testing.T) {
@@ -367,6 +629,10 @@ func TestCondition_evaluateWithCertificateExpirationGreaterThanNumericalFailure(
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[CERTIFICATE_EXPIRATION] (1209600000) > 2419200000"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithCertificateExpirationGreaterThanDuration(t *testing.T) {
@@ -376,6 +642,10 @@ func TestCondition_evaluateWithCertificateExpirationGreaterThanDuration(t *testi
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
 	}
+	expectedConditionDisplayed := "[CERTIFICATE_EXPIRATION] > 12h"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }
 
 func TestCondition_evaluateWithCertificateExpirationGreaterThanDurationFailure(t *testing.T) {
@@ -385,4 +655,8 @@ func TestCondition_evaluateWithCertificateExpirationGreaterThanDurationFailure(t
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
 	}
+	expectedConditionDisplayed := "[CERTIFICATE_EXPIRATION] (86400000) > 48h (172800000)"
+	if result.ConditionResults[0].Condition != expectedConditionDisplayed {
+		t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", condition, expectedConditionDisplayed, result.ConditionResults[0].Condition)
+	}
 }

core/dns.go

@@ -11,6 +11,7 @@ import (
 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")
 )
@@ -19,9 +20,11 @@ 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"`
 }

core/dns_test.go

@@ -2,6 +2,8 @@ package core
 
 import (
 	"testing"
+
+	"github.com/TwinProduction/gatus/pattern"
 )
 
 func TestIntegrationQuery(t *testing.T) {
@@ -61,7 +63,7 @@ func TestIntegrationQuery(t *testing.T) {
 			},
 			inputURL:        "8.8.8.8",
 			expectedDNSCode: "NOERROR",
-			expectedBody:    "b.iana-servers.net.",
+			expectedBody:    "*.iana-servers.net.",
 		},
 		{
 			name: "test DNS with fake type and retrieve error",
@@ -87,8 +89,15 @@ func TestIntegrationQuery(t *testing.T) {
 				t.Errorf("DNSRCodePlaceholder '%s' should have been %s", result.DNSRCode, test.expectedDNSCode)
 			}
 
-			if string(result.Body) != test.expectedBody {
-				t.Errorf("got %s, expected result %s,", string(result.Body), test.expectedBody)
+			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)
+				}
 			}
 		})
 	}

core/event.go

@@ -0,0 +1,26 @@
+package core
+
+import "time"
+
+// Event is something that happens at a specific time
+type Event struct {
+	// Type is the kind of event
+	Type EventType `json:"type"`
+
+	// Timestamp is the moment at which the event happened
+	Timestamp time.Time `json:"timestamp"`
+}
+
+// EventType is, uh, the types of events?
+type EventType string
+
+var (
+	// EventStart is a type of event that represents when a service starts being monitored
+	EventStart EventType = "START"
+
+	// EventHealthy is a type of event that represents a service passing all of its conditions
+	EventHealthy EventType = "HEALTHY"
+
+	// EventUnhealthy is a type of event that represents a service failing one or more of its conditions
+	EventUnhealthy EventType = "UNHEALTHY"
+)

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

@@ -4,23 +4,13 @@ import (
 	"time"
 )
 
-// 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"`
-}
-
 // 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 DNS query in human readable version
-	DNSRCode string `json:"dns-rcode"`
+	// 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:"-"`
@@ -41,7 +31,7 @@ type Result struct {
 	Errors []string `json:"errors"`
 
 	// ConditionResults results of the service's conditions
-	ConditionResults []*ConditionResult `json:"condition-results"`
+	ConditionResults []*ConditionResult `json:"conditionResults"`
 
 	// Success whether the result signifies a success or not
 	Success bool `json:"success"`
@@ -50,14 +40,5 @@ type Result struct {
 	Timestamp time.Time `json:"timestamp"`
 
 	// CertificateExpiration is the duration before the certificate expires
-	CertificateExpiration time.Duration `json:"certificate-expiration,omitempty"`
-}
-
-// 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"`
+	CertificateExpiration time.Duration `json:"-"`
 }

core/service-status.go

@@ -0,0 +1,126 @@
+package core
+
+import (
+	"time"
+
+	"github.com/TwinProduction/gatus/util"
+)
+
+const (
+	// MaximumNumberOfResults is the maximum number of results that ServiceStatus.Results can have
+	MaximumNumberOfResults = 100
+
+	// MaximumNumberOfEvents is the maximum number of events that ServiceStatus.Events can have
+	MaximumNumberOfEvents = 50
+)
+
+// 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"`
+
+	// Key is the key representing the ServiceStatus
+	Key string `json:"key"`
+
+	// Results is the list of service evaluation results
+	Results []*Result `json:"results"`
+
+	// Events is a list of events
+	//
+	// We don't expose this through JSON, because the main dashboard doesn't need to have this data.
+	// However, the detailed service page does leverage this by including it to a map that will be
+	// marshalled alongside the ServiceStatus.
+	Events []*Event `json:"-"`
+
+	// Uptime information on the service's uptime
+	//
+	// We don't expose this through JSON, because the main dashboard doesn't need to have this data.
+	// However, the detailed service page does leverage this by including it to a map that will be
+	// marshalled alongside the ServiceStatus.
+	Uptime *Uptime `json:"-"`
+}
+
+// NewServiceStatus creates a new ServiceStatus
+func NewServiceStatus(service *Service) *ServiceStatus {
+	return &ServiceStatus{
+		Name:    service.Name,
+		Group:   service.Group,
+		Key:     util.ConvertGroupAndServiceToKey(service.Group, service.Name),
+		Results: make([]*Result, 0),
+		Events: []*Event{{
+			Type:      EventStart,
+			Timestamp: time.Now(),
+		}},
+		Uptime: NewUptime(),
+	}
+}
+
+// ShallowCopy creates a shallow copy of ServiceStatus
+func (ss *ServiceStatus) ShallowCopy() *ServiceStatus {
+	return &ServiceStatus{
+		Name:    ss.Name,
+		Group:   ss.Group,
+		Key:     ss.Key,
+		Results: ss.Results,
+		Events:  ss.Events,
+		Uptime:  ss.Uptime,
+	}
+}
+
+// WithResultPagination makes a shallow copy of the ServiceStatus with only the results
+// within the range defined by the page and pageSize parameters
+func (ss *ServiceStatus) WithResultPagination(page, pageSize int) *ServiceStatus {
+	shallowCopy := ss.ShallowCopy()
+	numberOfResults := len(shallowCopy.Results)
+	start := numberOfResults - (page * pageSize)
+	end := numberOfResults - ((page - 1) * pageSize)
+	if start > numberOfResults {
+		start = -1
+	} else if start < 0 {
+		start = 0
+	}
+	if end > numberOfResults {
+		end = numberOfResults
+	}
+	if start < 0 || end < 0 {
+		shallowCopy.Results = []*Result{}
+	} else {
+		shallowCopy.Results = shallowCopy.Results[start:end]
+	}
+	return shallowCopy
+}
+
+// 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) {
+	if len(ss.Results) > 0 {
+		// Check if there's any change since the last result
+		// OR there's only 1 event, which only happens when there's a start event
+		if ss.Results[len(ss.Results)-1].Success != result.Success || len(ss.Events) == 1 {
+			event := &Event{Timestamp: result.Timestamp}
+			if result.Success {
+				event.Type = EventHealthy
+			} else {
+				event.Type = EventUnhealthy
+			}
+			ss.Events = append(ss.Events, event)
+			if len(ss.Events) > MaximumNumberOfEvents {
+				// Doing ss.Events[1:] would usually be sufficient, but in the case where for some reason, the slice has
+				// more than one extra element, we can get rid of all of them at once and thus returning the slice to a
+				// length of MaximumNumberOfEvents by using ss.Events[len(ss.Events)-MaximumNumberOfEvents:] instead
+				ss.Events = ss.Events[len(ss.Events)-MaximumNumberOfEvents:]
+			}
+		}
+	}
+	ss.Results = append(ss.Results, result)
+	if len(ss.Results) > MaximumNumberOfResults {
+		// Doing ss.Results[1:] would usually be sufficient, but in the case where for some reason, the slice has more
+		// than one extra element, we can get rid of all of them at once and thus returning the slice to a length of
+		// MaximumNumberOfResults by using ss.Results[len(ss.Results)-MaximumNumberOfResults:] instead
+		ss.Results = ss.Results[len(ss.Results)-MaximumNumberOfResults:]
+	}
+	ss.Uptime.ProcessResult(result)
+}

core/service-status_test.go

@@ -0,0 +1,66 @@
+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)
+	}
+	if serviceStatus.Key != "group_name" {
+		t.Errorf("expected %s, got %s", "group_name", serviceStatus.Key)
+	}
+}
+
+func TestServiceStatus_AddResult(t *testing.T) {
+	service := &Service{Name: "name", Group: "group"}
+	serviceStatus := NewServiceStatus(service)
+	for i := 0; i < MaximumNumberOfResults+10; i++ {
+		serviceStatus.AddResult(&Result{Timestamp: time.Now()})
+	}
+	if len(serviceStatus.Results) != MaximumNumberOfResults {
+		t.Errorf("expected serviceStatus.Results to not exceed a length of 20")
+	}
+}
+
+func TestServiceStatus_WithResultPagination(t *testing.T) {
+	service := &Service{Name: "name", Group: "group"}
+	serviceStatus := NewServiceStatus(service)
+	for i := 0; i < 25; i++ {
+		serviceStatus.AddResult(&Result{Timestamp: time.Now()})
+	}
+	if len(serviceStatus.WithResultPagination(1, 1).Results) != 1 {
+		t.Errorf("expected to have 1 result")
+	}
+	if len(serviceStatus.WithResultPagination(5, 0).Results) != 0 {
+		t.Errorf("expected to have 0 results")
+	}
+	if len(serviceStatus.WithResultPagination(-1, 20).Results) != 0 {
+		t.Errorf("expected to have 0 result, because the page was invalid")
+	}
+	if len(serviceStatus.WithResultPagination(1, -1).Results) != 0 {
+		t.Errorf("expected to have 0 result, because the page size was invalid")
+	}
+	if len(serviceStatus.WithResultPagination(1, 10).Results) != 10 {
+		t.Errorf("expected to have 10 results, because given a page size of 10, page 1 should have 10 elements")
+	}
+	if len(serviceStatus.WithResultPagination(2, 10).Results) != 10 {
+		t.Errorf("expected to have 10 results, because given a page size of 10, page 2 should have 10 elements")
+	}
+	if len(serviceStatus.WithResultPagination(3, 10).Results) != 5 {
+		t.Errorf("expected to have 5 results, because given a page size of 10, page 3 should have 5 elements")
+	}
+	if len(serviceStatus.WithResultPagination(4, 10).Results) != 0 {
+		t.Errorf("expected to have 0 results, because given a page size of 10, page 4 should have 0 elements")
+	}
+	if len(serviceStatus.WithResultPagination(1, 50).Results) != 25 {
+		t.Errorf("expected to have 25 results, because there's only 25 results")
+	}
+}

core/service.go

@@ -14,14 +14,28 @@ import (
 	"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 (
-	// ErrServiceWithNoCondition is the error with which gatus will panic if a service is configured with no conditions
+	// 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 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 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")
 )
 
@@ -30,6 +44,9 @@ 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"`
 
@@ -79,6 +96,15 @@ func (service *Service) ValidateAndSetDefaults() {
 	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.FailureThreshold <= 0 {
 			alert.FailureThreshold = 3
@@ -96,12 +122,10 @@ func (service *Service) ValidateAndSetDefaults() {
 	if len(service.Conditions) == 0 {
 		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)))
 	if err != nil {
@@ -166,9 +190,10 @@ func (service *Service) call(result *Result) {
 	var request *http.Request
 	var response *http.Response
 	var err error
-	isServiceTCP := strings.HasPrefix(service.URL, "tcp://")
 	isServiceDNS := service.DNS != nil
-	isServiceHTTP := !isServiceTCP && !isServiceDNS
+	isServiceTCP := strings.HasPrefix(service.URL, "tcp://")
+	isServiceICMP := strings.HasPrefix(service.URL, "icmp://")
+	isServiceHTTP := !isServiceDNS && !isServiceTCP && !isServiceICMP
 	if isServiceHTTP {
 		request = service.buildHTTPRequest()
 	}
@@ -177,8 +202,10 @@ func (service *Service) call(result *Result) {
 		service.DNS.query(service.URL, result)
 		result.Duration = time.Since(startTime)
 	} else if isServiceTCP {
-		result.Connected = client.CanCreateConnectionToTCPService(strings.TrimPrefix(service.URL, "tcp://"))
+		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)
@@ -186,9 +213,10 @@ func (service *Service) call(result *Result) {
 			result.Errors = append(result.Errors, err.Error())
 			return
 		}
+		defer response.Body.Close()
 		if response.TLS != nil && len(response.TLS.PeerCertificates) > 0 {
 			certificate := response.TLS.PeerCertificates[0]
-			result.CertificateExpiration = certificate.NotAfter.Sub(time.Now())
+			result.CertificateExpiration = time.Until(certificate.NotAfter)
 		}
 		result.HTTPStatus = response.StatusCode
 		result.Connected = response.StatusCode > 0
@@ -213,6 +241,9 @@ func (service *Service) buildHTTPRequest() *http.Request {
 	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

@@ -1,6 +1,8 @@
 package core
 
 import (
+	"io/ioutil"
+	"strings"
 	"testing"
 	"time"
 )
@@ -113,6 +115,101 @@ func TestService_GetAlertsTriggered(t *testing.T) {
 	}
 }
 
+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{
@@ -132,30 +229,6 @@ func TestIntegrationEvaluateHealth(t *testing.T) {
 	}
 }
 
-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 TestIntegrationEvaluateHealthWithFailure(t *testing.T) {
 	condition := Condition("[STATUS] == 500")
 	service := Service{
@@ -174,3 +247,60 @@ func TestIntegrationEvaluateHealthWithFailure(t *testing.T) {
 		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/uptime.go

@@ -0,0 +1,119 @@
+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 is a map containing the number of successes per hour, per timestamp following the
+	// custom RFC3339WithoutMinutesAndSeconds format
+	SuccessCountPerHour map[string]uint64 `json:"-"`
+
+	// TotalCountPerHour is a map containing the total number of checks per hour, per timestamp following the
+	// custom RFC3339WithoutMinutesAndSeconds format
+	TotalCountPerHour map[string]uint64 `json:"-"`
+}
+
+// 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)
+	}
+}

example/docker-compose-mattermost/config.yaml

@@ -1,6 +1,16 @@
+alerting:
+  mattermost:
+    webhook-url: "http://mattermost:8065/hooks/tokengoeshere"
+    insecure: true
+
 services:
   - name: example
     url: http://example.org
-    interval: 30s
+    interval: 1m
+    alerts:
+      - type: mattermost
+        enabled: true
+        description: "healthcheck failed 3 times in a row"
+        send-on-resolved: true
     conditions:
       - "[STATUS] == 200"

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

@@ -1,13 +1,24 @@
 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
+services:
+  gatus:
+    container_name: gatus
+    image: twinproduction/gatus:latest
+    ports:
+      - 8080:8080
+    volumes:
+      - ./config.yaml:/config/config.yaml
+    networks:
+      - default
+
+  mattermost:
+    container_name: mattermost
+    image: mattermost/mattermost-preview:5.26.0
+    ports:
+      - 8065:8065
+    networks:
+      - default
+
+networks:
+  default:
+    driver: bridge

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

@@ -81,11 +81,11 @@ spec:
               protocol: TCP
           resources:
             limits:
-              cpu: 200m
-              memory: 50M
+              cpu: 250m
+              memory: 100M
             requests:
               cpu: 50m
-              memory: 20M
+              memory: 30M
           volumeMounts:
             - mountPath: /config
               name: gatus-config

example/kubernetes/gatus.yaml

@@ -59,11 +59,11 @@ spec:
               protocol: TCP
           resources:
             limits:
-              cpu: 200m
-              memory: 50M
+              cpu: 250m
+              memory: 100M
             requests:
               cpu: 50m
-              memory: 20M
+              memory: 30M
           volumeMounts:
             - mountPath: /config
               name: gatus-config

go.mod

@@ -3,19 +3,24 @@ module github.com/TwinProduction/gatus
 go 1.15
 
 require (
-	github.com/googleapis/gnostic v0.5.3 // indirect
+	cloud.google.com/go v0.74.0 // indirect
+	github.com/TwinProduction/gocache v1.2.1
+	github.com/TwinProduction/health v1.0.0
+	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 v1.7.1
-	github.com/prometheus/common v0.13.0 // indirect
-	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	google.golang.org/protobuf v1.25.0 // indirect
-	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/yaml.v2 v2.3.0
-	k8s.io/api v0.0.0-20190816222004-e3a6b8045b0b
-	k8s.io/apimachinery v0.0.0-20190816221834-a9f1d8a9c101
-	k8s.io/client-go v11.0.1-0.20190918222721-c0e3722d5cf0+incompatible
-	k8s.io/klog v1.0.0 // indirect
-	k8s.io/utils v0.0.0-20201027101359-01387209bb0d // indirect
+	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

@@ -1,10 +1,59 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0 h1:eOI3/cP2VTU6uZLDYAoic+eyzzB9YyGmJ7eIjl8rOPg=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+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=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0 h1:kpgPA77kSSbjSs+fWHkPTxQ6J5Z2Qkruo5jfXEkHxNQ=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
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+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
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 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
+github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
+github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/TwinProduction/gocache v1.2.1 h1:NAdMwO9SQEZFmX69YWx6fzhwb6fHakkLri0451c+V1w=
+github.com/TwinProduction/gocache v1.2.1/go.mod h1:6zkBoLjrFLkIISwkZTgLy67qliCGSon1xpORM4Ri5HM=
+github.com/TwinProduction/health v1.0.0 h1:TVyYTAORQQZ8LaptX8jCHZRCGCAO6e+oJx19BUIzQYY=
+github.com/TwinProduction/health v1.0.0/go.mod h1:ys4mYKUeEfYrWmkm60xLtPjTuLIEDQNBZaTZvenLG1c=
 github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
@@ -31,8 +80,13 @@ github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QH
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/clbanning/x2j v0.0.0-20191024224557-825249438eec/go.mod h1:jMjuTZXRI4dUb/I5gc9Hdhagfvm9+RyrPryS/auMzxE=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
@@ -44,20 +98,31 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
+github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
 github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
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+github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
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 github.com/envoyproxy/go-control-plane v0.6.9/go.mod h1:SBwIajubJHhxtWwsL9s8ss4safvEdbitLhGGK48rN6g=
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 github.com/franela/goreq v0.0.0-20171204163338-bcd34c9993f8/go.mod h1:ZhphrRTfi2rbfLwlschooIH4+wKKDR4Pdxhh+TRoA20=
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@@ -65,6 +130,13 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
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@@ -77,11 +149,23 @@ github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXP
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@@ -99,19 +183,49 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
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@@ -137,6 +251,9 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
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@@ -149,6 +266,8 @@ github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/u
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@@ -160,14 +279,13 @@ github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxv
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@@ -190,8 +308,10 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJ
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@@ -199,12 +319,22 @@ github.com/nats-io/nats.go v1.9.1/go.mod h1:ZjDU1L/7fJ09jvUSRVBR2e7+RnLiiIQyqyzE
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@@ -218,12 +348,14 @@ github.com/pact-foundation/pact-go v1.0.4/go.mod h1:uExwJY4kCzNPcHRj+hCR/HBbOOIw
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@@ -232,6 +364,8 @@ github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5Fsn
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@@ -245,14 +379,16 @@ github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y8
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@@ -270,9 +406,11 @@ github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4k
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@@ -280,17 +418,31 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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+go.etcd.io/bbolt v1.3.5 h1:XAzx9gjCb0Rxj7EoqcClPD1d5ZBxZJk0jbuoPHenBt0=
+go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
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+go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
+go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
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+go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
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@@ -300,21 +452,51 @@ go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
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+k8s.io/client-go v0.18.14 h1:9dWb5D0dBsuc2umLPuWVE07rPDmBNsggW3vvctDyJII=
+k8s.io/client-go v0.18.14/go.mod h1:fpZHBter1MB6bs+GISolsmIRsGlBEJyd0mllE0H9f2Y=
+k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
+k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
+k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
-k8s.io/utils v0.0.0-20201027101359-01387209bb0d h1:1qqs/6lQQGCeZhCu0tO7La4lAazDXic6BiCmpjWcWUo=
-k8s.io/utils v0.0.0-20201027101359-01387209bb0d/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+k8s.io/kube-openapi v0.0.0-20200410145947-61e04a5be9a6/go.mod h1:GRQhZsXIAJ1xR0C9bd8UpWHZ5plfAS9fzPjJuQ6JL3E=
+k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89 h1:d4vVOjXm687F1iLSP2q3lyPPuyvTUt3aVoBpi2DqRsU=
+k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/structured-merge-diff/v3 v3.0.0-20200116222232-67a7b8c61874/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
+sigs.k8s.io/structured-merge-diff/v3 v3.0.0 h1:dOmIZBMfhcHS09XZkMyUgkq5trg3/jRyJYFZUiaOp8E=
+sigs.k8s.io/structured-merge-diff/v3 v3.0.0/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

k8s/client.go

@@ -1,6 +1,7 @@
 package k8s
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"os"
@@ -15,20 +16,20 @@ import (
 	"k8s.io/client-go/tools/clientcmd"
 )
 
-// KubernetesClientApi is a minimal interface for interacting with Kubernetes
+// KubernetesClientAPI is a minimal interface for interacting with Kubernetes
 // Created mostly to make mocking the Kubernetes client easier
-type KubernetesClientApi interface {
+type KubernetesClientAPI interface {
 	GetServices(namespace string) ([]v1.Service, error)
 }
 
-// KubernetesClient is a working implementation of KubernetesClientApi
+// 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(metav1.ListOptions{})
+	services, err := k.client.CoreV1().Services(namespace).List(context.TODO(), metav1.ListOptions{})
 	if err != nil {
 		return nil, err
 	}
@@ -43,7 +44,7 @@ func NewKubernetesClient(client *kubernetes.Clientset) *KubernetesClient {
 }
 
 // NewClient creates a Kubernetes client for the given ClusterMode
-func NewClient(clusterMode ClusterMode) (KubernetesClientApi, error) {
+func NewClient(clusterMode ClusterMode) (KubernetesClientAPI, error) {
 	var kubeConfig *rest.Config
 	var err error
 	switch clusterMode {

k8s/k8s.go

@@ -5,6 +5,6 @@ import (
 )
 
 // GetKubernetesServices return a list of Services from the given namespace
-func GetKubernetesServices(client KubernetesClientApi, namespace string) ([]v1.Service, error) {
+func GetKubernetesServices(client KubernetesClientAPI, namespace string) ([]v1.Service, error) {
 	return client.GetServices(namespace)
 }

main.go

@@ -1,45 +1,37 @@
 package main
 
 import (
-	"bytes"
-	"compress/gzip"
 	"log"
-	"net/http"
 	"os"
-	"strings"
-	"time"
+	"os/signal"
+	"syscall"
 
 	"github.com/TwinProduction/gatus/config"
-	"github.com/TwinProduction/gatus/security"
+	"github.com/TwinProduction/gatus/controller"
+	"github.com/TwinProduction/gatus/storage"
 	"github.com/TwinProduction/gatus/watchdog"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-)
-
-const cacheTTL = 10 * time.Second
-
-var (
-	cachedServiceResults          []byte
-	cachedServiceResultsGzipped   []byte
-	cachedServiceResultsTimestamp time.Time
 )
 
 func main() {
 	cfg := loadConfiguration()
-	resultsHandler := serviceResultsHandler
-	if cfg.Security != nil && cfg.Security.IsValid() {
-		resultsHandler = security.Handler(serviceResultsHandler, cfg.Security)
-	}
-	http.HandleFunc("/favicon.ico", favIconHandler) // favicon needs to be always served from the root
-	http.HandleFunc(cfg.Web.PrependWithContextRoot("/api/v1/results"), resultsHandler)
-	http.HandleFunc(cfg.Web.PrependWithContextRoot("/health"), healthHandler)
-	http.Handle(cfg.Web.ContextRoot, GzipHandler(http.StripPrefix(cfg.Web.ContextRoot, http.FileServer(http.Dir("./static")))))
-
-	if cfg.Metrics {
-		http.Handle(cfg.Web.PrependWithContextRoot("/metrics"), promhttp.Handler())
-	}
-	log.Printf("[main][main] Listening on %s%s\n", cfg.Web.SocketAddress(), cfg.Web.ContextRoot)
 	go watchdog.Monitor(cfg)
-	log.Fatal(http.ListenAndServe(cfg.Web.SocketAddress(), nil))
+	go controller.Handle()
+	// Wait for termination signal
+	sig := make(chan os.Signal, 1)
+	done := make(chan bool, 1)
+	signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		<-sig
+		log.Println("Received termination signal, attempting to gracefully shut down")
+		controller.Shutdown()
+		err := storage.Get().Save()
+		if err != nil {
+			log.Println("Failed to save storage provider:", err.Error())
+		}
+		done <- true
+	}()
+	<-done
+	log.Println("Shutting down")
 }
 
 func loadConfiguration() *config.Config {
@@ -55,43 +47,3 @@ 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\"}"))
-}
-
-// favIconHandler handles requests for /favicon.ico
-func favIconHandler(writer http.ResponseWriter, request *http.Request) {
-	http.ServeFile(writer, request, "./static/favicon.ico")
-}

pattern/pattern.go

@@ -1,12 +1,20 @@
 package pattern
 
-import "path/filepath"
+import (
+	"path/filepath"
+	"strings"
+)
 
 // Match checks whether a string matches a pattern
 func Match(pattern, s string) bool {
 	if pattern == "*" {
 		return true
 	}
+	// Separators found in the string break filepath.Match, so we'll remove all of them.
+	// This has a pretty significant impact on performance when there are separators in
+	// the strings, but at least it doesn't break filepath.Match.
+	s = strings.ReplaceAll(s, string(filepath.Separator), "")
+	pattern = strings.ReplaceAll(pattern, string(filepath.Separator), "")
 	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

@@ -1,6 +1,9 @@
 package pattern
 
-import "testing"
+import (
+	"fmt"
+	"testing"
+)
 
 func TestMatch(t *testing.T) {
 	testMatch(t, "*", "livingroom_123", true)
@@ -15,6 +18,7 @@ func TestMatch(t *testing.T) {
 	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)
@@ -24,14 +28,16 @@ func TestMatch(t *testing.T) {
 }
 
 func testMatch(t *testing.T, pattern, key string, expectedToMatch bool) {
-	matched := Match(pattern, key)
-	if expectedToMatch {
-		if !matched {
-			t.Errorf("%s should've matched pattern '%s'", key, pattern)
+	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)
+			}
 		}
-	} else {
-		if matched {
-			t.Errorf("%s shouldn't have matched pattern '%s'", key, pattern)
-		}
-	}
+	})
 }

static/index.html

@@ -1,335 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-	<title>Health Dashboard</title>
-	<meta name="viewport" content="width=device-width, initial-scale=1" />
-	<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;
-		}
-		#settings {
-			position: fixed;
-			left: 5px;
-			bottom: 5px;
-			padding: 5px;
-		}
-		#settings select:focus {
-			box-shadow: none;
-		}
-	</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>
-		</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>
-	</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>
-		let serviceStatuses = {};
-		let timerHandler = 0;
-		let refreshIntervalHandler = 0;
-		let userClickedStatus = false;
-
-		function showTooltip(serviceName, index, element) {
-			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();
-			} 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 fadeTooltip() {
-			if (!userClickedStatus) {
-				timerHandler = setTimeout(function () {
-					$("#tooltip").hide();
-				}, 500);
-			}
-		}
-
-		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>";
-			}
-			return "<span class='status badge badge-danger' style='width: 5%' onmouseenter='showTooltip(\""+serviceName+"\", "+index+", this)' onmouseleave='fadeTooltip()' onclick='userClickedStatus = !userClickedStatus;'>X</span>";
-		}
-
-		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();
-				}
-			});
-		}
-
-		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>";
-			}
-			$("#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 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 htmlEntities(s) {
-			return String(s)
-				.replace(/&/g, '&amp;')
-				.replace(/</g, '&lt;')
-				.replace(/>/g, '&gt;')
-				.replace(/"/g, '&quot;')
-				.replace(/'/g, '&apos;');
-		}
-
-		function setRefreshInterval(seconds) {
-			refreshResults();
-			refreshIntervalHandler = setInterval(function() {
-				refreshResults();
-			}, seconds * 1000)
-		}
-
-		$("#refresh-rate").change(function() {
-			clearInterval(refreshIntervalHandler);
-			setRefreshInterval($(this).val())
-		});
-		setRefreshInterval(30);
-		$("#refresh-rate").val(30);
-	</script>
-</body>
-</html>

storage/config.go

@@ -0,0 +1,8 @@
+package storage
+
+// Config is the configuration for alerting providers
+type Config struct {
+	// File is the path of the file to use for persistence
+	// If blank, persistence is disabled.
+	File string `yaml:"file"`
+}

storage/storage.go

@@ -0,0 +1,63 @@
+package storage
+
+import (
+	"log"
+	"time"
+
+	"github.com/TwinProduction/gatus/storage/store"
+	"github.com/TwinProduction/gatus/storage/store/memory"
+)
+
+var (
+	provider store.Store
+
+	// initialized keeps track of whether the storage provider was initialized
+	// Because store.Store is an interface, a nil check wouldn't be sufficient, so instead of doing reflection
+	// every single time Get is called, we'll just lazily keep track of its existence through this variable
+	initialized bool
+)
+
+// Get retrieves the storage provider
+func Get() store.Store {
+	if !initialized {
+		log.Println("[storage][Get] Provider requested before it was initialized, automatically initializing")
+		err := Initialize(nil)
+		if err != nil {
+			panic("failed to automatically initialize store: " + err.Error())
+		}
+	}
+	return provider
+}
+
+// Initialize instantiates the storage provider based on the Config provider
+func Initialize(cfg *Config) error {
+	initialized = true
+	var err error
+	if cfg == nil || len(cfg.File) == 0 {
+		log.Println("[storage][Initialize] Creating storage provider")
+		provider, err = memory.NewStore("")
+		if err != nil {
+			return err
+		}
+	} else {
+		log.Printf("[storage][Initialize] Creating storage provider with file=%s", cfg.File)
+		provider, err = memory.NewStore(cfg.File)
+		if err != nil {
+			return err
+		}
+		go autoSave(7 * time.Minute)
+	}
+	return nil
+}
+
+// autoSave automatically calls the Save function of the provider at every interval
+func autoSave(interval time.Duration) {
+	for {
+		time.Sleep(interval)
+		log.Printf("[storage][autoSave] Saving")
+		err := provider.Save()
+		if err != nil {
+			log.Println("[storage][autoSave] Save failed:", err.Error())
+		}
+	}
+}

storage/store/memory/memory.go

@@ -0,0 +1,104 @@
+package memory
+
+import (
+	"encoding/gob"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/util"
+	"github.com/TwinProduction/gocache"
+)
+
+func init() {
+	gob.Register(&core.ServiceStatus{})
+	gob.Register(&core.Uptime{})
+	gob.Register(&core.Result{})
+	gob.Register(&core.Event{})
+}
+
+// Store that leverages gocache
+type Store struct {
+	file  string
+	cache *gocache.Cache
+}
+
+// NewStore creates a new store
+func NewStore(file string) (*Store, error) {
+	store := &Store{
+		file:  file,
+		cache: gocache.NewCache().WithMaxSize(gocache.NoMaxSize),
+	}
+	if len(file) > 0 {
+		_, err := store.cache.ReadFromFile(file)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return store, nil
+}
+
+// GetAllServiceStatusesWithResultPagination returns all monitored core.ServiceStatus
+// with a subset of core.Result defined by the page and pageSize parameters
+func (s *Store) GetAllServiceStatusesWithResultPagination(page, pageSize int) map[string]*core.ServiceStatus {
+	serviceStatuses := s.cache.GetAll()
+	pagedServiceStatuses := make(map[string]*core.ServiceStatus, len(serviceStatuses))
+	for k, v := range serviceStatuses {
+		pagedServiceStatuses[k] = v.(*core.ServiceStatus).WithResultPagination(page, pageSize)
+	}
+	return pagedServiceStatuses
+}
+
+// GetServiceStatus returns the service status for a given service name in the given group
+func (s *Store) GetServiceStatus(groupName, serviceName string) *core.ServiceStatus {
+	return s.GetServiceStatusByKey(util.ConvertGroupAndServiceToKey(groupName, serviceName))
+}
+
+// GetServiceStatusByKey returns the service status for a given key
+func (s *Store) GetServiceStatusByKey(key string) *core.ServiceStatus {
+	serviceStatus := s.cache.GetValue(key)
+	if serviceStatus == nil {
+		return nil
+	}
+	return serviceStatus.(*core.ServiceStatus).ShallowCopy()
+}
+
+// Insert adds the observed result for the specified service into the store
+func (s *Store) Insert(service *core.Service, result *core.Result) {
+	key := util.ConvertGroupAndServiceToKey(service.Group, service.Name)
+	serviceStatus, exists := s.cache.Get(key)
+	if !exists {
+		serviceStatus = core.NewServiceStatus(service)
+	}
+	serviceStatus.(*core.ServiceStatus).AddResult(result)
+	s.cache.Set(key, serviceStatus)
+}
+
+// DeleteAllServiceStatusesNotInKeys removes all ServiceStatus that are not within the keys provided
+func (s *Store) DeleteAllServiceStatusesNotInKeys(keys []string) int {
+	var keysToDelete []string
+	for _, existingKey := range s.cache.GetKeysByPattern("*", 0) {
+		shouldDelete := true
+		for _, key := range keys {
+			if existingKey == key {
+				shouldDelete = false
+				break
+			}
+		}
+		if shouldDelete {
+			keysToDelete = append(keysToDelete, existingKey)
+		}
+	}
+	return s.cache.DeleteAll(keysToDelete)
+}
+
+// Clear deletes everything from the store
+func (s *Store) Clear() {
+	s.cache.Clear()
+}
+
+// Save persists the cache to the store file
+func (s *Store) Save() error {
+	if len(s.file) > 0 {
+		return s.cache.SaveToFile(s.file)
+	}
+	return nil
+}

storage/store/memory/memory_test.go

@@ -0,0 +1,277 @@
+package memory
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/util"
+)
+
+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 TestStore_Insert(t *testing.T) {
+	store, _ := NewStore("")
+	store.Insert(&testService, &testSuccessfulResult)
+	store.Insert(&testService, &testUnsuccessfulResult)
+
+	if store.cache.Count() != 1 {
+		t.Fatalf("expected 1 ServiceStatus, got %d", store.cache.Count())
+	}
+	key := fmt.Sprintf("%s_%s", testService.Group, testService.Name)
+	serviceStatus := store.GetServiceStatusByKey(key)
+	if serviceStatus == nil {
+		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 TestStore_GetServiceStatus(t *testing.T) {
+	store, _ := NewStore("")
+	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")
+	}
+}
+
+func TestStore_GetServiceStatusForMissingStatusReturnsNil(t *testing.T) {
+	store, _ := NewStore("")
+	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 TestStore_GetServiceStatusByKey(t *testing.T) {
+	store, _ := NewStore("")
+	store.Insert(&testService, &testSuccessfulResult)
+	store.Insert(&testService, &testUnsuccessfulResult)
+
+	serviceStatus := store.GetServiceStatusByKey(util.ConvertGroupAndServiceToKey(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")
+	}
+}
+
+func TestStore_GetAllServiceStatusesWithResultPagination(t *testing.T) {
+	store, _ := NewStore("")
+	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{}
+	serviceStatuses := store.GetAllServiceStatusesWithResultPagination(1, 20)
+	if len(serviceStatuses) != 1 {
+		t.Fatal("expected 1 service status")
+	}
+	actual, exists := serviceStatuses[util.ConvertGroupAndServiceToKey(testService.Group, testService.Name)]
+	if !exists {
+		t.Fatal("expected service status to exist")
+	}
+	if len(actual.Results) != 2 {
+		t.Error("expected 2 results, got", len(actual.Results))
+	}
+	if len(actual.Events) != 2 {
+		t.Error("expected 2 events, got", len(actual.Events))
+	}
+}
+
+func TestStore_DeleteAllServiceStatusesNotInKeys(t *testing.T) {
+	store, _ := NewStore("")
+	firstService := core.Service{Name: "service-1", Group: "group"}
+	secondService := core.Service{Name: "service-2", Group: "group"}
+	result := &testSuccessfulResult
+	store.Insert(&firstService, result)
+	store.Insert(&secondService, result)
+	if store.cache.Count() != 2 {
+		t.Errorf("expected cache to have 2 keys, got %d", store.cache.Count())
+	}
+	if store.GetServiceStatusByKey(util.ConvertGroupAndServiceToKey(firstService.Group, firstService.Name)) == nil {
+		t.Fatal("firstService should exist")
+	}
+	if store.GetServiceStatusByKey(util.ConvertGroupAndServiceToKey(secondService.Group, secondService.Name)) == nil {
+		t.Fatal("secondService should exist")
+	}
+	store.DeleteAllServiceStatusesNotInKeys([]string{util.ConvertGroupAndServiceToKey(firstService.Group, firstService.Name)})
+	if store.cache.Count() != 1 {
+		t.Fatalf("expected cache to have 1 keys, got %d", store.cache.Count())
+	}
+	if store.GetServiceStatusByKey(util.ConvertGroupAndServiceToKey(firstService.Group, firstService.Name)) == nil {
+		t.Error("secondService should've been deleted")
+	}
+	if store.GetServiceStatusByKey(util.ConvertGroupAndServiceToKey(secondService.Group, secondService.Name)) != nil {
+		t.Error("firstService should still exist")
+	}
+}
+
+func TestStore_Save(t *testing.T) {
+	files := []string{
+		"",
+		t.TempDir() + "/test.db",
+	}
+	for _, file := range files {
+		t.Run(file, func(t *testing.T) {
+			store, err := NewStore(file)
+			if err != nil {
+				t.Fatal("expected no error, got", err.Error())
+			}
+			err = store.Save()
+			if err != nil {
+				t.Fatal("expected no error, got", err.Error())
+			}
+		})
+	}
+}

storage/store/store.go

@@ -0,0 +1,38 @@
+package store
+
+import (
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/storage/store/memory"
+)
+
+// Store is the interface that each stores should implement
+type Store interface {
+	// GetAllAsJSON returns the JSON encoding of all monitored core.ServiceStatus
+	// with a subset of core.Result defined by the page and pageSize parameters
+	GetAllServiceStatusesWithResultPagination(page, pageSize int) map[string]*core.ServiceStatus
+
+	// GetServiceStatus returns the service status for a given service name in the given group
+	GetServiceStatus(groupName, serviceName string) *core.ServiceStatus
+
+	// GetServiceStatusByKey returns the service status for a given key
+	GetServiceStatusByKey(key string) *core.ServiceStatus
+
+	// Insert adds the observed result for the specified service into the store
+	Insert(service *core.Service, result *core.Result)
+
+	// DeleteAllServiceStatusesNotInKeys removes all ServiceStatus that are not within the keys provided
+	//
+	// Used to delete services that have been persisted but are no longer part of the configured services
+	DeleteAllServiceStatusesNotInKeys(keys []string) int
+
+	// Clear deletes everything from the store
+	Clear()
+
+	// Save persists the data if and where it needs to be persisted
+	Save() error
+}
+
+var (
+	// Validate interface implementation on compile
+	_ Store = (*memory.Store)(nil)
+)

storage/store/store_bench_test.go

@@ -0,0 +1,136 @@
+package store
+
+import (
+	"testing"
+	"time"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/storage/store/memory"
+)
+
+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 BenchmarkStore_GetAllAsJSON(b *testing.B) {
+	memoryStore, err := memory.NewStore("")
+	if err != nil {
+		b.Fatal("failed to create store:", err.Error())
+	}
+	type Scenario struct {
+		Name  string
+		Store Store
+	}
+	scenarios := []Scenario{
+		{
+			Name:  "memory",
+			Store: memoryStore,
+		},
+	}
+	for _, scenario := range scenarios {
+		scenario.Store.Insert(&testService, &testSuccessfulResult)
+		scenario.Store.Insert(&testService, &testUnsuccessfulResult)
+		b.Run(scenario.Name, func(b *testing.B) {
+			for n := 0; n < b.N; n++ {
+				scenario.Store.GetAllServiceStatusesWithResultPagination(1, 20)
+			}
+			b.ReportAllocs()
+		})
+	}
+}
+
+func BenchmarkStore_Insert(b *testing.B) {
+	memoryStore, err := memory.NewStore("")
+	if err != nil {
+		b.Fatal("failed to create store:", err.Error())
+	}
+	type Scenario struct {
+		Name  string
+		Store Store
+	}
+	scenarios := []Scenario{
+		{
+			Name:  "memory",
+			Store: memoryStore,
+		},
+	}
+	for _, scenario := range scenarios {
+		b.Run(scenario.Name, func(b *testing.B) {
+			for n := 0; n < b.N; n++ {
+				scenario.Store.Insert(&testService, &testSuccessfulResult)
+				scenario.Store.Insert(&testService, &testUnsuccessfulResult)
+			}
+			b.ReportAllocs()
+		})
+	}
+}

util/key.go

@@ -0,0 +1,18 @@
+package util
+
+import "strings"
+
+// ConvertGroupAndServiceToKey converts a group and a service to a key
+func ConvertGroupAndServiceToKey(group, service string) string {
+	return sanitize(group) + "_" + sanitize(service)
+}
+
+func sanitize(s string) string {
+	s = strings.TrimSpace(strings.ToLower(s))
+	s = strings.ReplaceAll(s, "/", "-")
+	s = strings.ReplaceAll(s, "_", "-")
+	s = strings.ReplaceAll(s, ".", "-")
+	s = strings.ReplaceAll(s, ",", "-")
+	s = strings.ReplaceAll(s, " ", "-")
+	return s
+}

util/key_test.go

@@ -0,0 +1,36 @@
+package util
+
+import "testing"
+
+func TestConvertGroupAndServiceToKey(t *testing.T) {
+	type Scenario struct {
+		GroupName      string
+		ServiceName    string
+		ExpectedOutput string
+	}
+	scenarios := []Scenario{
+		{
+			GroupName:      "Core",
+			ServiceName:    "Front End",
+			ExpectedOutput: "core_front-end",
+		},
+		{
+			GroupName:      "Load balancers",
+			ServiceName:    "us-west-2",
+			ExpectedOutput: "load-balancers_us-west-2",
+		},
+		{
+			GroupName:      "a/b test",
+			ServiceName:    "a",
+			ExpectedOutput: "a-b-test_a",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.ExpectedOutput, func(t *testing.T) {
+			output := ConvertGroupAndServiceToKey(scenario.GroupName, scenario.ServiceName)
+			if output != scenario.ExpectedOutput {
+				t.Errorf("Expected '%s', got '%s'", scenario.ExpectedOutput, output)
+			}
+		})
+	}
+}

vendor/cloud.google.com/go/AUTHORS

@@ -1,15 +0,0 @@
-# This is the official list of cloud authors for copyright purposes.
-# This file is distinct from the CONTRIBUTORS files.
-# See the latter for an explanation.
-
-# Names should be added to this file as:
-# Name or Organization <email address>
-# The email address is not required for organizations.
-
-Filippo Valsorda <hi@filippo.io>
-Google Inc.
-Ingo Oeser <nightlyone@googlemail.com>
-Palm Stone Games, Inc.
-Paweł Knap <pawelknap88@gmail.com>
-Péter Szilágyi <peterke@gmail.com>
-Tyler Treat <ttreat31@gmail.com>

vendor/cloud.google.com/go/CONTRIBUTORS

@@ -1,40 +0,0 @@
-# People who have agreed to one of the CLAs and can contribute patches.
-# The AUTHORS file lists the copyright holders; this file
-# lists people.  For example, Google employees are listed here
-# but not in AUTHORS, because Google holds the copyright.
-#
-# https://developers.google.com/open-source/cla/individual
-# https://developers.google.com/open-source/cla/corporate
-#
-# Names should be added to this file as:
-#     Name <email address>
-
-# Keep the list alphabetically sorted.
-
-Alexis Hunt <lexer@google.com>
-Andreas Litt <andreas.litt@gmail.com>
-Andrew Gerrand <adg@golang.org>
-Brad Fitzpatrick <bradfitz@golang.org>
-Burcu Dogan <jbd@google.com>
-Dave Day <djd@golang.org>
-David Sansome <me@davidsansome.com>
-David Symonds <dsymonds@golang.org>
-Filippo Valsorda <hi@filippo.io>
-Glenn Lewis <gmlewis@google.com>
-Ingo Oeser <nightlyone@googlemail.com>
-James Hall <james.hall@shopify.com>
-Johan Euphrosine <proppy@google.com>
-Jonathan Amsterdam <jba@google.com>
-Kunpei Sakai <namusyaka@gmail.com>
-Luna Duclos <luna.duclos@palmstonegames.com>
-Magnus Hiie <magnus.hiie@gmail.com>
-Mario Castro <mariocaster@gmail.com>
-Michael McGreevy <mcgreevy@golang.org>
-Omar Jarjur <ojarjur@google.com>
-Paweł Knap <pawelknap88@gmail.com>
-Péter Szilágyi <peterke@gmail.com>
-Sarah Adams <shadams@google.com>
-Thanatat Tamtan <acoshift@gmail.com>
-Toby Burress <kurin@google.com>
-Tuo Shan <shantuo@google.com>
-Tyler Treat <ttreat31@gmail.com>

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

@@ -61,25 +61,14 @@ var (
 	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,
-			ResponseHeaderTimeout: 2 * time.Second,
-		},
-	}}
-	subscribeClient = &Client{hc: &http.Client{
-		Transport: &http.Transport{
-			Dial: (&net.Dialer{
-				Timeout:   2 * time.Second,
-				KeepAlive: 30 * time.Second,
-			}).Dial,
-		},
-	}}
-)
+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.
 //
@@ -137,7 +126,7 @@ func testOnGCE() bool {
 	resc := make(chan bool, 2)
 
 	// Try two strategies in parallel.
-	// See https://github.com/GoogleCloudPlatform/google-cloud-go/issues/194
+	// 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)
@@ -151,7 +140,7 @@ func testOnGCE() bool {
 	}()
 
 	go func() {
-		addrs, err := net.LookupHost("metadata.google.internal")
+		addrs, err := net.DefaultResolver.LookupHost(ctx, "metadata.google.internal")
 		if err != nil || len(addrs) == 0 {
 			resc <- false
 			return
@@ -206,10 +195,9 @@ func systemInfoSuggestsGCE() bool {
 	return name == "Google" || name == "Google Compute Engine"
 }
 
-// Subscribe calls Client.Subscribe on a client designed for subscribing (one with no
-// ResponseHeaderTimeout).
+// Subscribe calls Client.Subscribe on the default client.
 func Subscribe(suffix string, fn func(v string, ok bool) error) error {
-	return subscribeClient.Subscribe(suffix, fn)
+	return defaultClient.Subscribe(suffix, fn)
 }
 
 // Get calls Client.Get on the default client.
@@ -227,6 +215,9 @@ 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() }
@@ -277,9 +268,14 @@ type Client struct {
 	hc *http.Client
 }
 
-// NewClient returns a Client that can be used to fetch metadata. All HTTP requests
-// will use the given http.Client instead of the default 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}
 }
 
@@ -300,8 +296,12 @@ func (c *Client) getETag(suffix string) (value, etag string, err error) {
 		// being stable anyway.
 		host = metadataIP
 	}
-	url := "http://" + host + "/computeMetadata/v1/" + suffix
-	req, _ := http.NewRequest("GET", url, nil)
+	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)
@@ -312,13 +312,13 @@ func (c *Client) getETag(suffix string) (value, etag string, err error) {
 	if res.StatusCode == http.StatusNotFound {
 		return "", "", NotDefinedError(suffix)
 	}
-	if res.StatusCode != 200 {
-		return "", "", fmt.Errorf("status code %d trying to fetch %s", res.StatusCode, url)
-	}
 	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
 }
 
@@ -367,6 +367,16 @@ 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")
@@ -394,11 +404,7 @@ func (c *Client) InstanceTags() ([]string, error) {
 
 // InstanceName returns the current VM's instance ID string.
 func (c *Client) InstanceName() (string, error) {
-	host, err := c.Hostname()
-	if err != nil {
-		return "", err
-	}
-	return strings.Split(host, ".")[0], nil
+	return c.getTrimmed("instance/name")
 }
 
 // Zone returns the current VM's zone, such as "us-central1-b".
@@ -499,3 +505,15 @@ func (c *Client) Subscribe(suffix string, fn func(v string, ok bool) error) erro
 		}
 	}
 }
+
+// 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 +1,476 @@
+# 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` limit its external dependencies to the strict 
+minimum (e.g. boltdb for persistence), however, rather than re-inventing the wheel, the server implementation uses
+redcon, which is a very good 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).WithPort(6379)
+	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 |
+
+```
+// Normal map
+BenchmarkMap_Get
+BenchmarkMap_Get-8                                                              46087372  26.7 ns/op
+BenchmarkMap_Set                                                                   
+BenchmarkMap_Set/small_value-8                                                   3841911   389 ns/op
+BenchmarkMap_Set/medium_value-8                                                  3887074   391 ns/op
+BenchmarkMap_Set/large_value-8                                                   3921956   393 ns/op
+// Gocache                                                                         
+BenchmarkCache_Get                                                                 
+BenchmarkCache_Get/FirstInFirstOut-8                                            27273036  46.4 ns/op
+BenchmarkCache_Get/LeastRecentlyUsed-8                                          26648248  46.3 ns/op
+BenchmarkCache_Set                                                              
+BenchmarkCache_Set/FirstInFirstOut_small_value-8                                 2919584   405 ns/op
+BenchmarkCache_Set/FirstInFirstOut_medium_value-8                                2990841   391 ns/op
+BenchmarkCache_Set/FirstInFirstOut_large_value-8                                 2970513   391 ns/op
+BenchmarkCache_Set/LeastRecentlyUsed_small_value-8                               2962939   402 ns/op
+BenchmarkCache_Set/LeastRecentlyUsed_medium_value-8                              2962963   390 ns/op
+BenchmarkCache_Set/LeastRecentlyUsed_large_value-8                               2962928   394 ns/op
+BenchmarkCache_SetUsingMaxMemoryUsage                                           
+BenchmarkCache_SetUsingMaxMemoryUsage/small_value-8                              2683356   447 ns/op
+BenchmarkCache_SetUsingMaxMemoryUsage/medium_value-8                             2637578   441 ns/op
+BenchmarkCache_SetUsingMaxMemoryUsage/large_value-8                              2672434   443 ns/op
+BenchmarkCache_SetWithMaxSize                                                   
+BenchmarkCache_SetWithMaxSize/100_small_value-8                                  4782966   252 ns/op
+BenchmarkCache_SetWithMaxSize/10000_small_value-8                                4067967   296 ns/op
+BenchmarkCache_SetWithMaxSize/100000_small_value-8                               3762055   328 ns/op
+BenchmarkCache_SetWithMaxSize/100_medium_value-8                                 4760479   252 ns/op
+BenchmarkCache_SetWithMaxSize/10000_medium_value-8                               4081050   295 ns/op
+BenchmarkCache_SetWithMaxSize/100000_medium_value-8                              3785050   330 ns/op
+BenchmarkCache_SetWithMaxSize/100_large_value-8                                  4732909   254 ns/op
+BenchmarkCache_SetWithMaxSize/10000_large_value-8                                4079533   297 ns/op
+BenchmarkCache_SetWithMaxSize/100000_large_value-8                               3712820   331 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU                                             
+BenchmarkCache_SetWithMaxSizeAndLRU/100_small_value-8                            4761732   254 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/10000_small_value-8                          4084474   296 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/100000_small_value-8                         3761402   329 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/100_medium_value-8                           4783075   254 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/10000_medium_value-8                         4103980   296 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/100000_medium_value-8                        3646023   331 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/100_large_value-8                            4779025   254 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/10000_large_value-8                          4096192   296 ns/op
+BenchmarkCache_SetWithMaxSizeAndLRU/100000_large_value-8                         3726823   331 ns/op
+BenchmarkCache_GetSetMultipleConcurrent                                         
+BenchmarkCache_GetSetMultipleConcurrent-8                                         707142  1698 ns/op
+BenchmarkCache_GetSetConcurrentWithFrequentEviction
+BenchmarkCache_GetSetConcurrentWithFrequentEviction/FirstInFirstOut-8            3616256   334 ns/op
+BenchmarkCache_GetSetConcurrentWithFrequentEviction/LeastRecentlyUsed-8          3636367   331 ns/op
+BenchmarkCache_GetConcurrentWithLRU                                              
+BenchmarkCache_GetConcurrentWithLRU/FirstInFirstOut-8                            4405557   268 ns/op
+BenchmarkCache_GetConcurrentWithLRU/LeastRecentlyUsed-8                          4445475   269 ns/op
+BenchmarkCache_WithForceNilInterfaceOnNilPointer
+BenchmarkCache_WithForceNilInterfaceOnNilPointer/true_with_nil_struct_pointer-8  6184591   191 ns/op
+BenchmarkCache_WithForceNilInterfaceOnNilPointer/true-8                          6090482   191 ns/op
+BenchmarkCache_WithForceNilInterfaceOnNilPointer/false_with_nil_struct_pointer-8 6184629   187 ns/op
+BenchmarkCache_WithForceNilInterfaceOnNilPointer/false-8                         6281781   186 ns/op
+(Trimmed "BenchmarkCache_" for readability)
+WithForceNilInterfaceOnNilPointerWithConcurrency
+WithForceNilInterfaceOnNilPointerWithConcurrency/true_with_nil_struct_pointer-8  4379564   268 ns/op
+WithForceNilInterfaceOnNilPointerWithConcurrency/true-8                          4379558   265 ns/op
+WithForceNilInterfaceOnNilPointerWithConcurrency/false_with_nil_struct_pointer-8 4444456   261 ns/op
+WithForceNilInterfaceOnNilPointerWithConcurrency/false-8                         4493896   262 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/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
+	go.etcd.io/bbolt v1.3.5
+)

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

@@ -0,0 +1,67 @@
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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vendor/github.com/TwinProduction/gocache/gocache.go

@@ -0,0 +1,567 @@
+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 (which is nil)
+//     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 nil pointer as an interface{}
+	// means that the interface itself is not nil, because the interface value is nil but not the type.
+	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
+}
+
+// GetValue retrieves an entry using the key passed as parameter
+// Unlike Get, this function only returns the value
+func (cache *Cache) GetValue(key string) interface{} {
+	value, _ := cache.Get(key)
+	return value
+}
+
+// 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"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+// 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 +1,32 @@
+package gocache
+
+type EvictionPolicy string
+
+var (
+	// LeastRecentlyUsed is an eviction policy that causes the most recently accessed cache entry to be moved to the
+	// head of the cache. Effectively, this causes the cache entries that have not been accessed for some time to
+	// gradually move closer and closer to the tail, and since the tail is the entry that gets deleted when an eviction
+	// is required, it allows less used cache entries to be evicted while keeping recently accessed entries at or close
+	// to the head.
+	//
+	// For instance, creating a Cache with a Cache.MaxSize of 3 and creating the entries 1, 2 and 3 in that order would
+	// put 3 at the head and 1 at the tail:
+	//     3 (head) -> 2 -> 1 (tail)
+	// If the cache entry 1 was then accessed, 1 would become the head and 2 the tail:
+	//     1 (head) -> 3 -> 2 (tail)
+	// If a cache entry 4 was then created, because the Cache.MaxSize is 3, the tail (2) would then be evicted:
+	//     4 (head) -> 1 -> 3 (tail)
+	LeastRecentlyUsed EvictionPolicy = "LeastRecentlyUsed"
+
+	// FirstInFirstOut is an eviction policy that causes cache entries to be evicted in the same order that they are
+	// created.
+	//
+	// For instance, creating a Cache with a Cache.MaxSize of 3 and creating the entries 1, 2 and 3 in that order would
+	// put 3 at the head and 1 at the tail:
+	//     3 (head) -> 2 -> 1 (tail)
+	// If the cache entry 1 was then accessed, unlike with LeastRecentlyUsed, nothing would change:
+	//     3 (head) -> 2 -> 1 (tail)
+	// If a cache entry 4 was then created, because the Cache.MaxSize is 3, the tail (1) would then be evicted:
+	//     4 (head) -> 3 -> 2 (tail)
+	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/TwinProduction/health/.gitattributes

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

vendor/github.com/TwinProduction/health/.gitignore

@@ -0,0 +1,2 @@
+.idea
+*.iml

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

@@ -0,0 +1,72 @@
+# health
+
+![build](https://github.com/TwinProduction/health/workflows/build/badge.svg?branch=master) 
+[![Go Report Card](https://goreportcard.com/badge/github.com/TwinProduction/health)](https://goreportcard.com/report/github.com/TwinProduction/health)
+[![codecov](https://codecov.io/gh/TwinProduction/health/branch/master/graph/badge.svg)](https://codecov.io/gh/TwinProduction/health)
+[![Go version](https://img.shields.io/github/go-mod/go-version/TwinProduction/health.svg)](https://github.com/TwinProduction/health)
+[![Go Reference](https://pkg.go.dev/badge/github.com/TwinProduction/health.svg)](https://pkg.go.dev/github.com/TwinProduction/health)
+
+Health is a library used for creating a very simple health endpoint.
+
+While implementing a health endpoint is very simple, I've grown tired of implementing 
+it over and over again.
+
+## Installation
+
+```
+go get -u github.com/TwinProduction/health
+```
+
+
+## Usage
+
+To retrieve the handler, you must use `health.Handler()` and are expected to pass it to the router like so:
+```go
+router := http.NewServeMux()
+router.Handle("/health", health.Handler())
+server := &http.Server{
+	Addr:    ":8080",
+	Handler: router,
+}
+```
+
+By default, the handler will return `UP` when the status is down, and `DOWN` when the status is down.
+If you prefer using JSON, however, you may initialize the health handler like so:
+```go
+router.Handle("/health", health.Handler().WithJSON(true))
+```
+The above will cause the response body to become `{"status":"UP"}` and `{"status":"DOWN"}` for both status respectively.
+
+To change the health of the application, you can use `health.SetStatus(<status>)` where `<status>` is one `health.Up`
+or `health.Down`:
+
+```go
+health.SetStatus(health.Up)
+health.SetStatus(health.Down)
+```
+
+### Complete example
+
+```go
+package main
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/TwinProduction/health"
+)
+
+func main() {
+	router := http.NewServeMux()
+	router.Handle("/health", health.Handler())
+	server := &http.Server{
+		Addr:         "0.0.0.0:8080",
+		Handler:      router,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 15 * time.Second,
+		IdleTimeout:  15 * time.Second,
+	}
+	server.ListenAndServe()
+}
+```

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

@@ -0,0 +1,3 @@
+module github.com/TwinProduction/health
+
+go 1.15

vendor/github.com/TwinProduction/health/health.go

@@ -0,0 +1,51 @@
+package health
+
+import "net/http"
+
+var (
+	handler = &healthHandler{
+		useJSON: false,
+		status:  Up,
+	}
+)
+
+type healthHandler struct {
+	useJSON bool
+	status  Status
+}
+
+// WithJSON configures whether the handler should output a response in JSON or in raw text
+//
+// Defaults to false
+func (h *healthHandler) WithJSON(v bool) *healthHandler {
+	h.useJSON = v
+	return h
+}
+
+func (h healthHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	var status int
+	var body []byte
+	if h.status == Up {
+		status = http.StatusOK
+	} else {
+		status = http.StatusInternalServerError
+	}
+	if h.useJSON {
+		writer.Header().Set("Content-Type", "application/json")
+		body = []byte(`{"status":"` + h.status + `"}`)
+	} else {
+		body = []byte(h.status)
+	}
+	writer.WriteHeader(status)
+	_, _ = writer.Write(body)
+}
+
+// Handler retrieves the health handler
+func Handler() *healthHandler {
+	return handler
+}
+
+// SetStatus sets the status to be reflected by the health handler
+func SetStatus(status Status) {
+	handler.status = status
+}

vendor/github.com/TwinProduction/health/status.go

@@ -0,0 +1,8 @@
+package health
+
+type Status string
+
+var (
+	Down Status = "DOWN"
+	Up   Status = "UP"
+)