watch_client_adapter.go

Documentation: go.etcd.io/etcd/server/v3/proxy/grpcproxy/adapter

     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 "go.etcd.io/etcd/api/v3/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  }
    67
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