go.uber.org/yarpc@v1.72.1/encoding/protobuf/stream.go (about)

     1  // Copyright (c) 2022 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package protobuf
    22  
    23  import (
    24  	"bytes"
    25  	"context"
    26  
    27  	"github.com/gogo/protobuf/proto"
    28  	"go.uber.org/yarpc/api/transport"
    29  )
    30  
    31  // readFromStream reads a proto.Message from a stream.
    32  func readFromStream(
    33  	ctx context.Context,
    34  	stream transport.Stream,
    35  	newMessage func() proto.Message,
    36  	codec *codec,
    37  ) (proto.Message, error) {
    38  	streamMsg, err := stream.ReceiveMessage(ctx)
    39  	if err != nil {
    40  		return nil, convertFromYARPCError(Encoding, err, codec)
    41  	}
    42  	message := newMessage()
    43  	if err := unmarshal(stream.Request().Meta.Encoding, streamMsg.Body, message, codec); err != nil {
    44  		streamMsg.Body.Close()
    45  		return nil, err
    46  	}
    47  	if streamMsg.Body != nil {
    48  		streamMsg.Body.Close()
    49  	}
    50  	return message, nil
    51  }
    52  
    53  // writeToStream writes a proto.Message to a stream.
    54  func writeToStream(ctx context.Context, stream transport.Stream, message proto.Message, codec *codec) error {
    55  	messageData, cleanup, err := marshal(stream.Request().Meta.Encoding, message, codec)
    56  	if err != nil {
    57  		return err
    58  	}
    59  	return stream.SendMessage(
    60  		ctx,
    61  		&transport.StreamMessage{
    62  			Body: readCloser{
    63  				Reader: bytes.NewReader(messageData),
    64  				closer: cleanup,
    65  			},
    66  			BodySize: len(messageData),
    67  		},
    68  	)
    69  }
    70  
    71  type readCloser struct {
    72  	*bytes.Reader
    73  	closer func()
    74  }
    75  
    76  func (r readCloser) Close() error {
    77  	r.closer()
    78  	return nil
    79  }