forked from AcalephStorage/consul-alerts
/
event-handler.go
80 lines (65 loc) · 1.73 KB
/
event-handler.go
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package main
import (
"bytes"
"encoding/json"
"net/http"
"os/exec"
"github.com/AcalephStorage/consul-alerts/consul"
log "github.com/AcalephStorage/consul-alerts/Godeps/_workspace/src/github.com/Sirupsen/logrus"
)
var eventsChannel = make(chan []consul.Event)
var firstEventRun bool = true
func eventHandler(w http.ResponseWriter, r *http.Request) {
consulClient.LoadConfig()
if firstEventRun {
log.Println("Now watching for events.")
firstEventRun = false
// set status to OK
return
}
if !consulClient.EventsEnabled() {
log.Println("Event handling disabled. Event ignored.")
// set to OK?
return
}
var events []consul.Event
toWatchObject(r.Body, &events)
eventsChannel <- events
// set status to OK
}
func processEvents() {
for {
events := <-eventsChannel
for _, event := range events {
processEvent(event)
}
}
}
func processEvent(event consul.Event) {
log.Println("----------------------------------------")
log.Printf("Processing event %s:\n", event.ID)
log.Println("----------------------------------------")
eventHandlers := consulClient.EventHandlers(event.Name)
for _, eventHandler := range eventHandlers {
executeEventHandler(event, eventHandler)
}
log.Printf("Event Processed.\n\n")
}
func executeEventHandler(event consul.Event, eventHandler string) {
data, err := json.Marshal(&event)
if err != nil {
log.Println("Unable to read event: ", event)
// then what?
}
input := bytes.NewReader(data)
output := new(bytes.Buffer)
cmd := exec.Command(eventHandler)
cmd.Stdin = input
cmd.Stdout = output
cmd.Stderr = output
if err := cmd.Run(); err != nil {
log.Println("error running handler: ", err)
} else {
log.Printf(">>> \n%s -> %s:\n %s\n", event.ID, eventHandler, output)
}
}