feat(alerting): Add new providers for Datadog, IFTTT, Line, NewRelic, Plivo, RocketChat, SendGrid, Signal, SIGNL4, Splunk, Squadcast, Vonage, Webex and Zapier (#1224)
* feat(alerting): Add new providers for Datadog, IFTTT, Line, NewRelic, Plivo, RocketChat, SendGrid, Signal, SIGNL4, Splunk, Squadcast, Vonage, Webex and Zapier Relevant: https://github.com/TwiN/gatus/discussions/1223 Fixes #1073 Fixes #1074 * chore: Clean up code * docs: Fix table formatting * Update alerting/provider/datadog/datadog.go * Update alerting/provider/signal/signal.go * Update alerting/provider/ifttt/ifttt.go * Update alerting/provider/newrelic/newrelic.go * Update alerting/provider/squadcast/squadcast.go * Update alerting/provider/squadcast/squadcast.go
This commit is contained in:
TwiN
248
alerting/provider/sendgrid/sendgrid.go
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248
alerting/provider/sendgrid/sendgrid.go
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package sendgrid
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strings"
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"github.com/TwiN/gatus/v5/alerting/alert"
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"github.com/TwiN/gatus/v5/client"
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"github.com/TwiN/gatus/v5/config/endpoint"
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"gopkg.in/yaml.v3"
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)
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const (
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ApiURL = "https://api.sendgrid.com/v3/mail/send"
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)
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var (
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ErrAPIKeyNotSet = errors.New("api-key not set")
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ErrFromNotSet = errors.New("from not set")
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ErrToNotSet = errors.New("to not set")
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ErrDuplicateGroupOverride = errors.New("duplicate group override")
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)
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type Config struct {
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APIKey string `yaml:"api-key"`
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From string `yaml:"from"`
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To string `yaml:"to"`
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// ClientConfig is the configuration of the client used to communicate with the provider's target
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ClientConfig *client.Config `yaml:"client,omitempty"`
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}
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func (cfg *Config) Validate() error {
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if len(cfg.APIKey) == 0 {
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return ErrAPIKeyNotSet
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}
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if len(cfg.From) == 0 {
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return ErrFromNotSet
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}
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if len(cfg.To) == 0 {
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return ErrToNotSet
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}
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return nil
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}
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func (cfg *Config) Merge(override *Config) {
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if override.ClientConfig != nil {
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cfg.ClientConfig = override.ClientConfig
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}
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if len(override.APIKey) > 0 {
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cfg.APIKey = override.APIKey
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}
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if len(override.From) > 0 {
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cfg.From = override.From
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}
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if len(override.To) > 0 {
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cfg.To = override.To
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}
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}
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// AlertProvider is the configuration necessary for sending an alert using SendGrid
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type AlertProvider struct {
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DefaultConfig Config `yaml:",inline"`
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// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
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DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
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// Overrides is a list of Override that may be prioritized over the default configuration
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Overrides []Override `yaml:"overrides,omitempty"`
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}
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// Override is a case under which the default integration is overridden
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type Override struct {
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Group string `yaml:"group"`
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Config `yaml:",inline"`
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}
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// Validate the provider's configuration
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func (provider *AlertProvider) Validate() error {
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registeredGroups := make(map[string]bool)
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if provider.Overrides != nil {
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for _, override := range provider.Overrides {
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if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
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return ErrDuplicateGroupOverride
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}
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registeredGroups[override.Group] = true
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}
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}
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return provider.DefaultConfig.Validate()
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}
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// Send an alert using the provider
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func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
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cfg, err := provider.GetConfig(ep.Group, alert)
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if err != nil {
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return err
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}
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subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
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payload := provider.buildSendGridPayload(cfg, subject, body)
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payloadBytes, err := json.Marshal(payload)
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if err != nil {
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return err
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}
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request, err := http.NewRequest(http.MethodPost, ApiURL, bytes.NewBuffer(payloadBytes))
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if err != nil {
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return err
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}
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request.Header.Set("Content-Type", "application/json")
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request.Header.Set("Authorization", "Bearer "+cfg.APIKey)
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response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
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if err != nil {
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return err
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}
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defer response.Body.Close()
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if response.StatusCode >= 400 {
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body, _ := io.ReadAll(response.Body)
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return fmt.Errorf("call to sendgrid alert returned status code %d: %s", response.StatusCode, string(body))
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}
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return nil
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}
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type SendGridPayload struct {
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Personalizations []Personalization `json:"personalizations"`
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From Email `json:"from"`
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Subject string `json:"subject"`
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Content []Content `json:"content"`
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}
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type Personalization struct {
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To []Email `json:"to"`
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}
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type Email struct {
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Email string `json:"email"`
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}
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type Content struct {
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Type string `json:"type"`
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Value string `json:"value"`
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}
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// buildSendGridPayload builds the SendGrid API payload
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func (provider *AlertProvider) buildSendGridPayload(cfg *Config, subject, body string) SendGridPayload {
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toEmails := strings.Split(cfg.To, ",")
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var recipients []Email
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for _, email := range toEmails {
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recipients = append(recipients, Email{Email: strings.TrimSpace(email)})
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}
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return SendGridPayload{
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Personalizations: []Personalization{
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{
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To: recipients,
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},
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},
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From: Email{
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Email: cfg.From,
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},
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Subject: subject,
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Content: []Content{
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{
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Type: "text/plain",
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Value: body,
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},
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{
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Type: "text/html",
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Value: strings.ReplaceAll(body, "\n", "<br>"),
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},
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},
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}
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}
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// buildMessageSubjectAndBody builds the message subject and body
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func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) (string, string) {
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var subject, message string
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if resolved {
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subject = fmt.Sprintf("[%s] Alert resolved", ep.DisplayName())
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message = fmt.Sprintf("An alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
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} else {
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subject = fmt.Sprintf("[%s] Alert triggered", ep.DisplayName())
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message = fmt.Sprintf("An alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
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}
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var formattedConditionResults string
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if len(result.ConditionResults) > 0 {
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formattedConditionResults = "\n\nCondition results:\n"
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for _, conditionResult := range result.ConditionResults {
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var prefix string
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if conditionResult.Success {
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prefix = "✅"
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} else {
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prefix = "❌"
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}
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formattedConditionResults += fmt.Sprintf("%s %s\n", prefix, conditionResult.Condition)
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}
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}
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var description string
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if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
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description = "\n\nAlert description: " + alertDescription
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}
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var extraLabels string
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if len(ep.ExtraLabels) > 0 {
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extraLabels = "\n\nExtra labels:\n"
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for key, value := range ep.ExtraLabels {
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extraLabels += fmt.Sprintf(" %s: %s\n", key, value)
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}
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}
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return subject, message + description + extraLabels + formattedConditionResults
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}
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// GetDefaultAlert returns the provider's default alert configuration
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func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
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return provider.DefaultAlert
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}
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// GetConfig returns the configuration for the provider with the overrides applied
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func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
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cfg := provider.DefaultConfig
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// Handle group overrides
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if provider.Overrides != nil {
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for _, override := range provider.Overrides {
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if group == override.Group {
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cfg.Merge(&override.Config)
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break
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}
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}
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}
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// Handle alert overrides
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if len(alert.ProviderOverride) != 0 {
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overrideConfig := Config{}
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if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
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return nil, err
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}
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cfg.Merge(&overrideConfig)
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}
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// Validate the configuration
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err := cfg.Validate()
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return &cfg, err
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}
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// ValidateOverrides validates the alert's provider override and, if present, the group override
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func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
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_, err := provider.GetConfig(group, alert)
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return err
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}
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