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Implement Slack alerting (#2)

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This commit is contained in:
TwinProduction 2020-08-20 21:11:22 -04:00
parent 6596d253aa
commit 6f4cf69c4e
3 changed files with 40 additions and 2 deletions
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4
alerting/slack.go
View File

@ -13,8 +13,8 @@ type requestBody struct {
}
// SendSlackMessage sends a message to the given Slack webhook
func SendSlackMessage(webhookUrl, msg string) error {
body, _ := json.Marshal(requestBody{Text: msg})
func SendSlackMessage(webhookUrl, service, description string) error {
body, _ := json.Marshal(requestBody{Text: fmt.Sprintf("*[Gatus]*\n*service:* %s\n*description:* %s", service, description)})
response, err := client.GetHttpClient().Post(webhookUrl, "application/json", bytes.NewBuffer(body))
if err != nil {
return err

22
core/service.go
View File

@ -26,6 +26,9 @@ type Service struct {
Headers map[string]string `yaml:"headers,omitempty"`
Interval time.Duration `yaml:"interval,omitempty"`
Conditions []*Condition `yaml:"conditions"`
Alerts []*Alert `yaml:"alerts"`
numberOfFailuresInARow int
}
func (service *Service) Validate() {
@ -68,9 +71,28 @@ func (service *Service) EvaluateConditions() *Result {
}
}
result.Timestamp = time.Now()
if result.Success {
service.numberOfFailuresInARow = 0
} else {
service.numberOfFailuresInARow++
}
return result
}
func (service *Service) GetAlertsTriggered() []Alert {
var alerts []Alert
if service.numberOfFailuresInARow == 0 {
return alerts
}
for _, alert := range service.Alerts {
if alert.Enabled && alert.Threshold == service.numberOfFailuresInARow {
alerts = append(alerts, *alert)
continue
}
}
return alerts
}
func (service *Service) getIp(result *Result) {
urlObject, err := url.Parse(service.Url)
if err != nil {

16
watchdog/watchdog.go
View File

@ -2,6 +2,7 @@ package watchdog
import (
"fmt"
"github.com/TwinProduction/gatus/alerting"
"github.com/TwinProduction/gatus/config"
"github.com/TwinProduction/gatus/core"
"github.com/TwinProduction/gatus/metric"
@ -54,6 +55,21 @@ func monitor(service *core.Service) {
result.Duration.Round(time.Millisecond),
extra,
)
cfg := config.Get()
if cfg.Alerting != nil {
for _, alertTriggered := range service.GetAlertsTriggered() {
if alertTriggered.Type == core.SlackAlert {
if len(cfg.Alerting.Slack) > 0 {
log.Printf("[watchdog][monitor] Sending Slack alert because alert with description=%s has been triggered", alertTriggered.Description)
alerting.SendSlackMessage(cfg.Alerting.Slack, service.Name, alertTriggered.Description)
} else {
log.Printf("[watchdog][monitor] Not sending Slack alert despite being triggered, because there is no Slack webhook configured")
}
}
}
}
log.Printf("[watchdog][monitor] Waiting for interval=%s before monitoring serviceName=%s", service.Interval, service.Name)
time.Sleep(service.Interval)
}