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 15package v3client 16 17import ( 18 "time" 19 20 "github.com/coreos/etcd/clientv3" 21 "github.com/coreos/etcd/etcdserver" 22 "github.com/coreos/etcd/etcdserver/api/v3rpc" 23 "github.com/coreos/etcd/proxy/grpcproxy/adapter" 24 25 "golang.org/x/net/context" 26) 27 28// New creates a clientv3 client that wraps an in-process EtcdServer. Instead 29// of making gRPC calls through sockets, the client makes direct function calls 30// to the etcd server through its api/v3rpc function interfaces. 31func New(s *etcdserver.EtcdServer) *clientv3.Client { 32 c := clientv3.NewCtxClient(context.Background()) 33 34 kvc := adapter.KvServerToKvClient(v3rpc.NewQuotaKVServer(s)) 35 c.KV = clientv3.NewKVFromKVClient(kvc, c) 36 37 lc := adapter.LeaseServerToLeaseClient(v3rpc.NewQuotaLeaseServer(s)) 38 c.Lease = clientv3.NewLeaseFromLeaseClient(lc, c, time.Second) 39 40 wc := adapter.WatchServerToWatchClient(v3rpc.NewWatchServer(s)) 41 c.Watcher = &watchWrapper{clientv3.NewWatchFromWatchClient(wc, c)} 42 43 mc := adapter.MaintenanceServerToMaintenanceClient(v3rpc.NewMaintenanceServer(s)) 44 c.Maintenance = clientv3.NewMaintenanceFromMaintenanceClient(mc, c) 45 46 clc := adapter.ClusterServerToClusterClient(v3rpc.NewClusterServer(s)) 47 c.Cluster = clientv3.NewClusterFromClusterClient(clc, c) 48 49 // TODO: implement clientv3.Auth interface? 50 51 return c 52} 53 54// BlankContext implements Stringer on a context so the ctx string doesn't 55// depend on the context's WithValue data, which tends to be unsynchronized 56// (e.g., x/net/trace), causing ctx.String() to throw data races. 57type blankContext struct{ context.Context } 58 59func (*blankContext) String() string { return "(blankCtx)" } 60 61// watchWrapper wraps clientv3 watch calls to blank out the context 62// to avoid races on trace data. 63type watchWrapper struct{ clientv3.Watcher } 64 65func (ww *watchWrapper) Watch(ctx context.Context, key string, opts ...clientv3.OpOption) clientv3.WatchChan { 66 return ww.Watcher.Watch(&blankContext{ctx}, key, opts...) 67} 68