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webserver.go
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webserver.go
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package main
import (
"fmt"
"log"
"net/http"
"time"
"github.com/gin-gonic/gin"
)
/*
cf https://prometheus.io/docs/alerting/configuration/#webhook_config
{
"version": "4",
"groupKey": <string>, // key identifying the group of alerts (e.g. to deduplicate)
"status": "<resolved|firing>",
"receiver": <string>,
"groupLabels": <object>,
"commonLabels": <object>,
"commonAnnotations": <object>,
"externalURL": <string>, // backlink to the Alertmanager.
"alerts": [
{
"labels": <object>,
"annotations": <object>,
"startsAt": "<rfc3339>",
"endsAt": "<rfc3339>"
},
...
]
}
*/
type PrometheusAlertDetail struct {
Labels map[string]string `json:"labels"`
Annotations map[string]string `json:"annotations"`
StartAt string `json:"startsAt"`
EndsAt string `json:"endsAt"`
}
type PrometheusAlert struct {
Version string `json:"version" binding:"required"`
GroupKey string `json:"groupKey"`
Status string `json:"status" binding:"required"`
Receiver string `json:"receiver"`
GroupLabels map[string]string `json:"groupLabels"`
CommonLabels map[string]string `json:"commonLabels"`
CommonAnnotations map[string]string `json:"commonAnnotations"`
ExternalURL string `json:"externalURL"`
Alerts []PrometheusAlertDetail `json:"alerts"`
}
// SubmitAlert receive an alert from Prometheus, and try to forward it to CachetHQ
func SubmitAlert(c *gin.Context, config *PrometheusCachetConfig) {
// check the Bearer
if config.PrometheusToken != "" {
bearer := c.GetHeader("Authorization")
if bearer != fmt.Sprintf("Bearer %s", config.PrometheusToken) {
if config.LogLevel == LOG_DEBUG {
log.Println("wrong Authorization header:", bearer)
}
c.JSON(http.StatusBadRequest, gin.H{"error": "wrong Authorization header"})
return
}
}
// read the payload
var alerts PrometheusAlert
if err := c.ShouldBindJSON(&alerts); err == nil {
// talk to CachetHQ
status := 1 // "resolved"
componentStatus := 1
if alerts.Status == "firing" {
status = 4
componentStatus = 4
}
list, err := config.Cachet.ListComponents()
if err != nil {
if config.LogLevel == LOG_DEBUG {
log.Println(err)
}
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// prometheus can send 2 times the same alerts info in one call
alreadyFired := make(map[int]int)
for _, alert := range alerts.Alerts {
// fire something
if componentID, ok := list[alert.Labels[config.LabelName]]; ok {
if alreadyFired[componentID] == 0 {
alreadyFired[componentID] = 1
if config.SquashIncident {
// firing
if status != 1 {
incidents, err := config.Cachet.SearchIncidents(componentID)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// if no open incident currently, let's create a new one
if len(incidents) == 0 || incidents[0].Status == 4 {
if err := config.Cachet.CreateIncident(alert.Labels[config.LabelName], componentID, status, componentStatus); err != nil {
if config.LogLevel == LOG_DEBUG {
log.Println(err)
}
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
}
} else { // resolved
// if we want to "squash" event for a given incident
if incidents, err := config.Cachet.SearchIncidents(componentID); err == nil {
if len(incidents) > 0 {
if err == nil {
config.Cachet.UpdateIncident(alert.Labels[config.LabelName], componentID, incidents[0].Id, status, fmt.Sprintf("Prometheus flagged service %s as up", alert.Labels[config.LabelName]))
incidentID := incidents[0].Id
componentName := alert.Labels[config.LabelName]
if incident, err := config.Cachet.ReadIncident(incidentID); err == nil {
layout := "2006-01-02 15:04:05"
createdAt, err1 := time.Parse(layout, incident.CreatedAt)
updatedAt, err2 := time.Parse(layout, incident.UpdatedAt)
if err1 == nil && err2 == nil {
config.Cachet.UpdateIncident(componentName, componentID, incidentID, status, fmt.Sprintf("Prometheus flagged service %s as up (service was down for %d minutes)", componentName, int(updatedAt.Sub(createdAt).Minutes())))
}
}
} else {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
} else {
c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("No incident found for component %d\n", componentID)})
return
}
} else {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
}
} else { // we dont 'squash' so let's create a new incident
if err := config.Cachet.CreateIncident(alert.Labels[config.LabelName], componentID, status, componentStatus); err != nil {
if config.LogLevel == LOG_DEBUG {
log.Println(err)
}
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
}
}
}
}
} else {
if config.LogLevel == LOG_DEBUG {
log.Println(err)
}
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
c.JSON(http.StatusOK, gin.H{"status": "OK"})
}
func PrepareGinRouter(config *PrometheusCachetConfig) *gin.Engine {
router := gin.New()
router.Use(gin.LoggerWithWriter(gin.DefaultWriter, "/health"))
router.Use(gin.Recovery())
router.GET("/health", func(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{"status": "OK"})
})
router.POST("/alert", func(c *gin.Context) {
SubmitAlert(c, config)
})
return router
}