github.com/tickoalcantara12/micro/v3@v3.0.0-20221007104245-9d75b9bcbab9/util/codec/proto/marshaler.go (about)

     1  // Licensed under the Apache License, Version 2.0 (the "License");
     2  // you may not use this file except in compliance with the License.
     3  // You may obtain a copy of the License at
     4  //
     5  //     https://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS,
     9  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    10  // See the License for the specific language governing permissions and
    11  // limitations under the License.
    12  //
    13  // Original source: github.com/micro/go-micro/v3/codec/proto/marshaler.go
    14  
    15  package proto
    16  
    17  import (
    18  	"bytes"
    19  
    20  	"github.com/golang/protobuf/proto"
    21  	"github.com/tickoalcantara12/micro/v3/util/codec"
    22  	"github.com/oxtoacart/bpool"
    23  )
    24  
    25  // create buffer pool with 16 instances each preallocated with 256 bytes
    26  var bufferPool = bpool.NewSizedBufferPool(16, 256)
    27  
    28  type Marshaler struct{}
    29  
    30  func (Marshaler) Marshal(v interface{}) ([]byte, error) {
    31  	pb, ok := v.(proto.Message)
    32  	if !ok {
    33  		return nil, codec.ErrInvalidMessage
    34  	}
    35  
    36  	// looks not good, but allows to reuse underlining bytes
    37  	buf := bufferPool.Get()
    38  	pbuf := proto.NewBuffer(buf.Bytes())
    39  	defer func() {
    40  		bufferPool.Put(bytes.NewBuffer(pbuf.Bytes()))
    41  	}()
    42  
    43  	if err := pbuf.Marshal(pb); err != nil {
    44  		return nil, err
    45  	}
    46  
    47  	return pbuf.Bytes(), nil
    48  }
    49  
    50  func (Marshaler) Unmarshal(data []byte, v interface{}) error {
    51  	pb, ok := v.(proto.Message)
    52  	if !ok {
    53  		return codec.ErrInvalidMessage
    54  	}
    55  
    56  	return proto.Unmarshal(data, pb)
    57  }
    58  
    59  func (Marshaler) String() string {
    60  	return "proto"
    61  }