vitess.io/vitess@v0.16.2/go/vt/servenv/grpc_codec.go (about)

     1  /*
     2  Copyright 2021 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package servenv
    18  
    19  import (
    20  	"fmt"
    21  
    22  	// use the original golang/protobuf package we can continue serializing
    23  	// messages from our dependencies, particularly from etcd
    24  	"github.com/golang/protobuf/proto" //nolint
    25  
    26  	"google.golang.org/grpc/encoding"
    27  	_ "google.golang.org/grpc/encoding/proto" // nolint:revive
    28  )
    29  
    30  // Name is the name registered for the proto compressor.
    31  const Name = "proto"
    32  
    33  type vtprotoCodec struct{}
    34  
    35  type vtprotoMessage interface {
    36  	MarshalVT() ([]byte, error)
    37  	UnmarshalVT([]byte) error
    38  }
    39  
    40  func (vtprotoCodec) Marshal(v any) ([]byte, error) {
    41  	vt, ok := v.(vtprotoMessage)
    42  	if ok {
    43  		return vt.MarshalVT()
    44  	}
    45  
    46  	vv, ok := v.(proto.Message)
    47  	if !ok {
    48  		return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
    49  	}
    50  	return proto.Marshal(vv)
    51  }
    52  
    53  func (vtprotoCodec) Unmarshal(data []byte, v any) error {
    54  	vt, ok := v.(vtprotoMessage)
    55  	if ok {
    56  		return vt.UnmarshalVT(data)
    57  	}
    58  
    59  	vv, ok := v.(proto.Message)
    60  	if !ok {
    61  		return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
    62  	}
    63  	return proto.Unmarshal(data, vv)
    64  }
    65  
    66  func (vtprotoCodec) Name() string {
    67  	return Name
    68  }
    69  
    70  func init() {
    71  	encoding.RegisterCodec(vtprotoCodec{})
    72  }