proto.go 1.5 KB

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  1. /*
  2. *
  3. * Copyright 2018 gRPC authors.
  4. *
  5. * Licensed under the Apache License, Version 2.0 (the "License");
  6. * you may not use this file except in compliance with the License.
  7. * You may obtain a copy of the License at
  8. *
  9. * http://www.apache.org/licenses/LICENSE-2.0
  10. *
  11. * Unless required by applicable law or agreed to in writing, software
  12. * distributed under the License is distributed on an "AS IS" BASIS,
  13. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14. * See the License for the specific language governing permissions and
  15. * limitations under the License.
  16. *
  17. */
  18. // Package proto defines the protobuf codec. Importing this package will
  19. // register the codec.
  20. package proto
  21. import (
  22. "fmt"
  23. "github.com/golang/protobuf/proto"
  24. "google.golang.org/grpc/encoding"
  25. )
  26. // Name is the name registered for the proto compressor.
  27. const Name = "proto"
  28. func init() {
  29. encoding.RegisterCodec(codec{})
  30. }
  31. // codec is a Codec implementation with protobuf. It is the default codec for gRPC.
  32. type codec struct{}
  33. func (codec) Marshal(v interface{}) ([]byte, error) {
  34. vv, ok := v.(proto.Message)
  35. if !ok {
  36. return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
  37. }
  38. return proto.Marshal(vv)
  39. }
  40. func (codec) Unmarshal(data []byte, v interface{}) error {
  41. vv, ok := v.(proto.Message)
  42. if !ok {
  43. return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
  44. }
  45. return proto.Unmarshal(data, vv)
  46. }
  47. func (codec) Name() string {
  48. return Name
  49. }