go.etcd.io/etcd@v3.3.27+incompatible/proxy/grpcproxy/health.go (about) 1 // Copyright 2017 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package grpcproxy 16 17 import ( 18 "context" 19 "net/http" 20 "time" 21 22 "github.com/coreos/etcd/clientv3" 23 "github.com/coreos/etcd/etcdserver/api/etcdhttp" 24 "github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes" 25 ) 26 27 // HandleHealth registers health handler on '/health'. 28 func HandleHealth(mux *http.ServeMux, c *clientv3.Client) { 29 mux.Handle(etcdhttp.PathHealth, etcdhttp.NewHealthHandler(func() etcdhttp.Health { return checkHealth(c) })) 30 } 31 32 func checkHealth(c *clientv3.Client) etcdhttp.Health { 33 h := etcdhttp.Health{Health: "false"} 34 ctx, cancel := context.WithTimeout(c.Ctx(), time.Second) 35 _, err := c.Get(ctx, "a") 36 cancel() 37 if err == nil || err == rpctypes.ErrPermissionDenied { 38 h.Health = "true" 39 } 40 return h 41 }