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twin-gatus/watchdog/alerting.go

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package watchdog
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import (
"encoding/json"
"log"
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"github.com/TwinProduction/gatus/config"
"github.com/TwinProduction/gatus/core"
)
// HandleAlerting takes care of alerts to resolve and alerts to trigger based on result success or failure
func HandleAlerting(service *core.Service, result *core.Result) {
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cfg := config.Get()
if cfg.Alerting == nil {
return
}
if result.Success {
handleAlertsToResolve(service, result, cfg)
} else {
handleAlertsToTrigger(service, result, cfg)
}
}
func handleAlertsToTrigger(service *core.Service, result *core.Result, cfg *config.Config) {
service.NumberOfSuccessesInARow = 0
service.NumberOfFailuresInARow++
for _, alert := range service.Alerts {
// If the alert hasn't been triggered, move to the next one
if !alert.IsEnabled() || alert.FailureThreshold > service.NumberOfFailuresInARow {
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continue
}
if alert.Triggered {
if cfg.Debug {
log.Printf("[watchdog][handleAlertsToTrigger] Alert for service=%s with description='%s' has already been TRIGGERED, skipping", service.Name, alert.GetDescription())
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}
continue
}
alertProvider := config.GetAlertingProviderByAlertType(cfg, alert.Type)
if alertProvider != nil && alertProvider.IsValid() {
log.Printf("[watchdog][handleAlertsToTrigger] Sending %s alert because alert for service=%s with description='%s' has been TRIGGERED", alert.Type, service.Name, alert.GetDescription())
customAlertProvider := alertProvider.ToCustomAlertProvider(service, alert, result, false)
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// TODO: retry on error
var err error
// We need to extract the DedupKey from PagerDuty's response
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if alert.Type == core.PagerDutyAlert {
var body []byte
if body, err = customAlertProvider.Send(service.Name, alert.GetDescription(), false); err == nil {
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var response pagerDutyResponse
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if err = json.Unmarshal(body, &response); err != nil {
log.Printf("[watchdog][handleAlertsToTrigger] Ran into error unmarshaling pagerduty response: %s", err.Error())
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} else {
alert.ResolveKey = response.DedupKey
}
}
} else {
// All other alert types don't need to extract anything from the body, so we can just send the request right away
_, err = customAlertProvider.Send(service.Name, alert.GetDescription(), false)
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}
if err != nil {
log.Printf("[watchdog][handleAlertsToTrigger] Failed to send an alert for service=%s: %s", service.Name, err.Error())
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} else {
alert.Triggered = true
}
} else {
log.Printf("[watchdog][handleAlertsToResolve] Not sending alert of type=%s despite being TRIGGERED, because the provider wasn't configured properly", alert.Type)
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}
}
}
func handleAlertsToResolve(service *core.Service, result *core.Result, cfg *config.Config) {
service.NumberOfSuccessesInARow++
for _, alert := range service.Alerts {
if !alert.IsEnabled() || !alert.Triggered || alert.SuccessThreshold > service.NumberOfSuccessesInARow {
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continue
}
// Even if the alert provider returns an error, we still set the alert's Triggered variable to false.
// Further explanation can be found on Alert's Triggered field.
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alert.Triggered = false
if !alert.IsSendingOnResolved() {
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continue
}
alertProvider := config.GetAlertingProviderByAlertType(cfg, alert.Type)
if alertProvider != nil && alertProvider.IsValid() {
log.Printf("[watchdog][handleAlertsToResolve] Sending %s alert because alert for service=%s with description='%s' has been RESOLVED", alert.Type, service.Name, alert.GetDescription())
customAlertProvider := alertProvider.ToCustomAlertProvider(service, alert, result, true)
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// TODO: retry on error
_, err := customAlertProvider.Send(service.Name, alert.GetDescription(), true)
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if err != nil {
log.Printf("[watchdog][handleAlertsToResolve] Failed to send an alert for service=%s: %s", service.Name, err.Error())
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} else {
if alert.Type == core.PagerDutyAlert {
alert.ResolveKey = ""
}
}
} else {
log.Printf("[watchdog][handleAlertsToResolve] Not sending alert of type=%s despite being RESOLVED, because the provider wasn't configured properly", alert.Type)
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}
}
service.NumberOfFailuresInARow = 0
}
type pagerDutyResponse struct {
Status string `json:"status"`
Message string `json:"message"`
DedupKey string `json:"dedup_key"`
}