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// Copyright 2017 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grpcproxy
import (
"context"
"fmt"
"net/http"
"time"
"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
"go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/server/v3/etcdserver/api/etcdhttp"
"go.uber.org/zap"
)
// HandleHealth registers health handler on '/health'.
func HandleHealth(lg *zap.Logger, mux *http.ServeMux, c *clientv3.Client) {
if lg == nil {
lg = zap.NewNop()
}
mux.Handle(etcdhttp.PathHealth, etcdhttp.NewHealthHandler(lg, func(ctx context.Context, excludedAlarms etcdhttp.StringSet, serializable bool) etcdhttp.Health {
return checkHealth(c)
}))
}
// HandleProxyHealth registers health handler on '/proxy/health'.
func HandleProxyHealth(lg *zap.Logger, mux *http.ServeMux, c *clientv3.Client) {
if lg == nil {
lg = zap.NewNop()
}
mux.Handle(etcdhttp.PathProxyHealth, etcdhttp.NewHealthHandler(lg, func(ctx context.Context, excludedAlarms etcdhttp.StringSet, serializable bool) etcdhttp.Health {
return checkProxyHealth(c)
}))
}
func checkHealth(c *clientv3.Client) etcdhttp.Health {
h := etcdhttp.Health{Health: "false"}
ctx, cancel := context.WithTimeout(c.Ctx(), time.Second)
_, err := c.Get(ctx, "a")
cancel()
if err == nil || err == rpctypes.ErrPermissionDenied {
h.Health = "true"
} else {
h.Reason = fmt.Sprintf("GET ERROR:%s", err)
}
return h
}
func checkProxyHealth(c *clientv3.Client) etcdhttp.Health {
if c == nil {
return etcdhttp.Health{Health: "false", Reason: "no connection to proxy"}
}
h := checkHealth(c)
if h.Health != "true" {
return h
}
ctx, cancel := context.WithTimeout(c.Ctx(), time.Second*3)
ch := c.Watch(ctx, "a", clientv3.WithCreatedNotify())
select {
case <-ch:
case <-ctx.Done():
h.Health = "false"
h.Reason = "WATCH TIMEOUT"
}
cancel()
return h
}
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