mirror of
https://github.com/google/alertmanager-irc-relay.git
synced 2024-12-02 16:09:25 +01:00
137 lines
4.0 KiB
Go
137 lines
4.0 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"encoding/json"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"strconv"
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"strings"
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"github.com/gorilla/mux"
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promtmpl "github.com/prometheus/alertmanager/template"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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var (
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handledAlertGroups = promauto.NewCounterVec(prometheus.CounterOpts{
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Name: "webhook_handled_alert_groups",
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Help: "Number of alert groups received"},
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[]string{"ircchannel"},
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)
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handledAlerts = promauto.NewCounterVec(prometheus.CounterOpts{
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Name: "webhook_handled_alerts",
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Help: "Number of single alert messages relayed"},
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[]string{"ircchannel"},
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)
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alertHandlingErrors = promauto.NewCounterVec(prometheus.CounterOpts{
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Name: "webhook_alert_handling_errors",
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Help: "Errors while processing webhook requests"},
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[]string{"ircchannel", "error"},
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)
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)
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type HTTPListener func(string, http.Handler) error
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type HTTPServer struct {
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Addr string
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Port int
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formatter *Formatter
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AlertMsgs chan AlertMsg
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httpListener HTTPListener
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}
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func NewHTTPServer(config *Config, alertMsgs chan AlertMsg) (
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*HTTPServer, error) {
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return NewHTTPServerForTesting(config, alertMsgs, http.ListenAndServe)
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}
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func NewHTTPServerForTesting(config *Config, alertMsgs chan AlertMsg,
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httpListener HTTPListener) (*HTTPServer, error) {
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formatter, err := NewFormatter(config)
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if err != nil {
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return nil, err
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}
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server := &HTTPServer{
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Addr: config.HTTPHost,
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Port: config.HTTPPort,
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formatter: formatter,
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AlertMsgs: alertMsgs,
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httpListener: httpListener,
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}
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return server, nil
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}
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func (s *HTTPServer) RelayAlert(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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ircChannel := "#" + vars["IRCChannel"]
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body, err := ioutil.ReadAll(io.LimitReader(r.Body, 1024*1024*1024))
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if err != nil {
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log.Printf("Could not get body: %s", err)
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alertHandlingErrors.WithLabelValues(ircChannel, "read_body").Inc()
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return
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}
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var alertMessage = promtmpl.Data{}
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if err := json.Unmarshal(body, &alertMessage); err != nil {
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log.Printf("Could not decode request body (%s): %s", err, body)
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alertHandlingErrors.WithLabelValues(ircChannel, "decode_body").Inc()
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w.Header().Set("Content-Type", "application/json; charset=UTF-8")
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w.WriteHeader(422) // Unprocessable entity
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if err := json.NewEncoder(w).Encode(err); err != nil {
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log.Printf("Could not write decoding error: %s", err)
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return
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}
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return
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}
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handledAlertGroups.WithLabelValues(ircChannel).Inc()
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for _, alertMsg := range s.formatter.GetMsgsFromAlertMessage(
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ircChannel, &alertMessage) {
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select {
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case s.AlertMsgs <- alertMsg:
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handledAlerts.WithLabelValues(ircChannel).Inc()
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default:
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log.Printf("Could not send this alert to the IRC routine: %s",
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alertMsg)
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alertHandlingErrors.WithLabelValues(ircChannel, "internal_comm_channel_full").Inc()
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}
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}
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}
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func (s *HTTPServer) Run() {
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router := mux.NewRouter().StrictSlash(true)
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router.Path("/metrics").Handler(promhttp.Handler())
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handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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s.RelayAlert(w, r)
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})
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router.Path("/{IRCChannel}").Handler(handler).Methods("POST")
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listenAddr := strings.Join(
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[]string{s.Addr, strconv.Itoa(s.Port)}, ":")
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log.Printf("Starting HTTP server")
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if err := s.httpListener(listenAddr, router); err != nil {
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log.Printf("Could not start http server: %s", err)
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}
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}
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