mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
// Copyright 2017 The etcd Authors
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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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// http://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 etcdhttp
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import (
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"context"
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"encoding/json"
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"net/http"
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"time"
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"github.com/coreos/etcd/etcdserver"
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"github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/raft"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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pathMetrics = "/metrics"
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PathHealth = "/health"
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)
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// HandleMetricsHealth registers metrics and health handlers.
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func HandleMetricsHealth(mux *http.ServeMux, srv *etcdserver.EtcdServer) {
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mux.Handle(pathMetrics, prometheus.Handler())
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mux.Handle(PathHealth, NewHealthHandler(func() Health { return checkHealth(srv) }))
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}
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// HandlePrometheus registers prometheus handler on '/metrics'.
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func HandlePrometheus(mux *http.ServeMux) {
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mux.Handle(pathMetrics, prometheus.Handler())
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}
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// HandleHealth registers health handler on '/health'.
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func HandleHealth(mux *http.ServeMux, srv *etcdserver.EtcdServer) {
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mux.Handle(PathHealth, NewHealthHandler(func() Health { return checkHealth(srv) }))
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}
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// NewHealthHandler handles '/health' requests.
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func NewHealthHandler(hfunc func() Health) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodGet {
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w.Header().Set("Allow", http.MethodGet)
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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h := hfunc()
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d, _ := json.Marshal(h)
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if !h.Health {
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http.Error(w, string(d), http.StatusServiceUnavailable)
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return
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}
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w.WriteHeader(http.StatusOK)
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w.Write(d)
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}
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}
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// Health defines etcd server health status.
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// TODO: remove manual parsing in etcdctl cluster-health
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type Health struct {
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Health bool `json:"health"`
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Errors []string `json:"errors,omitempty"`
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}
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func checkHealth(srv *etcdserver.EtcdServer) Health {
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h := Health{Health: false}
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as := srv.Alarms()
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if len(as) > 0 {
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for _, v := range as {
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h.Errors = append(h.Errors, v.Alarm.String())
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}
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return h
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}
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if uint64(srv.Leader()) == raft.None {
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h.Errors = append(h.Errors, etcdserver.ErrNoLeader.Error())
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return h
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}
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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_, err := srv.Do(ctx, etcdserverpb.Request{Method: "QGET"})
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cancel()
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if err != nil {
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h.Errors = append(h.Errors, err.Error())
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}
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h.Health = err == nil
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return h
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}
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