mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package grpcproxy
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import (
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"errors"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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)
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var errAlreadySentHeader = errors.New("grpcproxy: already send header")
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type ws2wc struct{ wserv pb.WatchServer }
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func WatchServerToWatchClient(wserv pb.WatchServer) pb.WatchClient {
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return &ws2wc{wserv}
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}
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func (s *ws2wc) Watch(ctx context.Context, opts ...grpc.CallOption) (pb.Watch_WatchClient, error) {
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// ch1 is buffered so server can send error on close
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ch1, ch2 := make(chan interface{}, 1), make(chan interface{})
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headerc, trailerc := make(chan metadata.MD, 1), make(chan metadata.MD, 1)
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cctx, ccancel := context.WithCancel(ctx)
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cli := &chanStream{recvc: ch1, sendc: ch2, ctx: cctx, cancel: ccancel}
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wclient := &ws2wcClientStream{chanClientStream{headerc, trailerc, cli}}
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sctx, scancel := context.WithCancel(ctx)
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srv := &chanStream{recvc: ch2, sendc: ch1, ctx: sctx, cancel: scancel}
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wserver := &ws2wcServerStream{chanServerStream{headerc, trailerc, srv, nil}}
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go func() {
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if err := s.wserv.Watch(wserver); err != nil {
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select {
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case srv.sendc <- err:
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case <-sctx.Done():
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case <-cctx.Done():
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}
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}
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scancel()
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ccancel()
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}()
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return wclient, nil
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}
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// ws2wcClientStream implements Watch_WatchClient
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type ws2wcClientStream struct{ chanClientStream }
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// ws2wcServerStream implements Watch_WatchServer
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type ws2wcServerStream struct{ chanServerStream }
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func (s *ws2wcClientStream) Send(wr *pb.WatchRequest) error {
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return s.SendMsg(wr)
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}
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func (s *ws2wcClientStream) Recv() (*pb.WatchResponse, error) {
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var v interface{}
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if err := s.RecvMsg(&v); err != nil {
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return nil, err
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}
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return v.(*pb.WatchResponse), nil
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}
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func (s *ws2wcServerStream) Send(wr *pb.WatchResponse) error {
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return s.SendMsg(wr)
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}
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func (s *ws2wcServerStream) Recv() (*pb.WatchRequest, error) {
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var v interface{}
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if err := s.RecvMsg(&v); err != nil {
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return nil, err
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}
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return v.(*pb.WatchRequest), nil
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}
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