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  }