go.etcd.io/etcd@v3.3.27+incompatible/proxy/grpcproxy/adapter/watch_client_adapter.go (about) 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 15 package adapter 16 17 import ( 18 "context" 19 "errors" 20 21 pb "github.com/coreos/etcd/etcdserver/etcdserverpb" 22 "google.golang.org/grpc" 23 ) 24 25 var errAlreadySentHeader = errors.New("adapter: already sent header") 26 27 type ws2wc struct{ wserv pb.WatchServer } 28 29 func WatchServerToWatchClient(wserv pb.WatchServer) pb.WatchClient { 30 return &ws2wc{wserv} 31 } 32 33 func (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 41 type ws2wcClientStream struct{ chanClientStream } 42 43 // ws2wcServerStream implements Watch_WatchServer 44 type ws2wcServerStream struct{ chanServerStream } 45 46 func (s *ws2wcClientStream) Send(wr *pb.WatchRequest) error { 47 return s.SendMsg(wr) 48 } 49 func (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 57 func (s *ws2wcServerStream) Send(wr *pb.WatchResponse) error { 58 return s.SendMsg(wr) 59 } 60 func (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 }