grpcproxy: client watch adapter
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// 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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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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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, ch2 := make(chan interface{}), make(chan interface{})
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headerc, trailerc := make(chan metadata.MD, 1), make(chan metadata.MD, 1)
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wclient := &ws2wcClientStream{chanClientStream{headerc, trailerc, &chanStream{ch1, ch2, ctx}}}
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wserver := &ws2wcServerStream{chanServerStream{headerc, trailerc, &chanStream{ch2, ch1, ctx}}}
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go s.wserv.Watch(wserver)
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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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// chanServerStream implements grpc.ServerStream with a chanStream
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type chanServerStream struct {
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headerc chan<- metadata.MD
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trailerc chan<- metadata.MD
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grpc.Stream
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}
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func (ss *chanServerStream) SendHeader(md metadata.MD) error {
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select {
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case ss.headerc <- md:
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return nil
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case <-ss.Context().Done():
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}
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return ss.Context().Err()
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}
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func (ss *chanServerStream) SetTrailer(md metadata.MD) {
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ss.trailerc <- md
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}
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// chanClientStream implements grpc.ClientStream with a chanStream
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type chanClientStream struct {
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headerc <-chan metadata.MD
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trailerc <-chan metadata.MD
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grpc.Stream
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}
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func (cs *chanClientStream) Header() (metadata.MD, error) {
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select {
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case md := <-cs.headerc:
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return md, nil
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case <-cs.Context().Done():
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}
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return nil, cs.Context().Err()
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}
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func (cs *chanClientStream) Trailer() metadata.MD {
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select {
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case md := <-cs.trailerc:
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return md
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case <-cs.Context().Done():
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return nil
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}
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}
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func (s *chanClientStream) CloseSend() error { return nil }
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// chanStream implements grpc.Stream using channels
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type chanStream struct {
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recvc <-chan interface{}
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sendc chan<- interface{}
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ctx context.Context
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}
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func (s *chanStream) Context() context.Context { return s.Context() }
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func (s *chanStream) SendMsg(m interface{}) error {
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select {
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case s.sendc <- m:
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return nil
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case <-s.ctx.Done():
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}
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return s.ctx.Err()
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}
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func (s *chanStream) RecvMsg(m interface{}) error {
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v := m.(*interface{})
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select {
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case m = <-s.recvc:
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*v = m
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return nil
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case <-s.ctx.Done():
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}
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return s.ctx.Err()
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}
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