1// Copyright 2016 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 adapter 16 17import ( 18 "context" 19 "errors" 20 21 pb "github.com/coreos/etcd/etcdserver/etcdserverpb" 22 "google.golang.org/grpc" 23) 24 25var errAlreadySentHeader = errors.New("adapter: already sent header") 26 27type ws2wc struct{ wserv pb.WatchServer } 28 29func WatchServerToWatchClient(wserv pb.WatchServer) pb.WatchClient { 30 return &ws2wc{wserv} 31} 32 33func (s *ws2wc) Watch(ctx context.Context, opts ...grpc.CallOption) (pb.Watch_WatchClient, error) { 34 cs := newPipeStream(ctx, func(ss chanServerStream) error { 35 return s.wserv.Watch(&ws2wcServerStream{ss}) 36 }) 37 return &ws2wcClientStream{cs}, nil 38} 39 40// ws2wcClientStream implements Watch_WatchClient 41type ws2wcClientStream struct{ chanClientStream } 42 43// ws2wcServerStream implements Watch_WatchServer 44type ws2wcServerStream struct{ chanServerStream } 45 46func (s *ws2wcClientStream) Send(wr *pb.WatchRequest) error { 47 return s.SendMsg(wr) 48} 49func (s *ws2wcClientStream) Recv() (*pb.WatchResponse, error) { 50 var v interface{} 51 if err := s.RecvMsg(&v); err != nil { 52 return nil, err 53 } 54 return v.(*pb.WatchResponse), nil 55} 56 57func (s *ws2wcServerStream) Send(wr *pb.WatchResponse) error { 58 return s.SendMsg(wr) 59} 60func (s *ws2wcServerStream) Recv() (*pb.WatchRequest, error) { 61 var v interface{} 62 if err := s.RecvMsg(&v); err != nil { 63 return nil, err 64 } 65 return v.(*pb.WatchRequest), nil 66} 67