forked from github/multus-cni
ac21a96804
gomodule is still in progress to migrate for now, hence multus team decide to keep vendor directory to support build without gomodule.
111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package proto defines the protobuf codec. Importing this package will
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// register the codec.
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package proto
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import (
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"math"
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"sync"
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"github.com/golang/protobuf/proto"
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"google.golang.org/grpc/encoding"
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)
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// Name is the name registered for the proto compressor.
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const Name = "proto"
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func init() {
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encoding.RegisterCodec(codec{})
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}
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// codec is a Codec implementation with protobuf. It is the default codec for gRPC.
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type codec struct{}
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type cachedProtoBuffer struct {
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lastMarshaledSize uint32
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proto.Buffer
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}
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func capToMaxInt32(val int) uint32 {
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if val > math.MaxInt32 {
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return uint32(math.MaxInt32)
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}
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return uint32(val)
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}
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func marshal(v interface{}, cb *cachedProtoBuffer) ([]byte, error) {
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protoMsg := v.(proto.Message)
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newSlice := make([]byte, 0, cb.lastMarshaledSize)
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cb.SetBuf(newSlice)
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cb.Reset()
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if err := cb.Marshal(protoMsg); err != nil {
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return nil, err
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}
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out := cb.Bytes()
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cb.lastMarshaledSize = capToMaxInt32(len(out))
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return out, nil
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}
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func (codec) Marshal(v interface{}) ([]byte, error) {
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if pm, ok := v.(proto.Marshaler); ok {
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// object can marshal itself, no need for buffer
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return pm.Marshal()
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}
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cb := protoBufferPool.Get().(*cachedProtoBuffer)
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out, err := marshal(v, cb)
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// put back buffer and lose the ref to the slice
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cb.SetBuf(nil)
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protoBufferPool.Put(cb)
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return out, err
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}
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func (codec) Unmarshal(data []byte, v interface{}) error {
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protoMsg := v.(proto.Message)
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protoMsg.Reset()
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if pu, ok := protoMsg.(proto.Unmarshaler); ok {
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// object can unmarshal itself, no need for buffer
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return pu.Unmarshal(data)
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}
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cb := protoBufferPool.Get().(*cachedProtoBuffer)
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cb.SetBuf(data)
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err := cb.Unmarshal(protoMsg)
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cb.SetBuf(nil)
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protoBufferPool.Put(cb)
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return err
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}
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func (codec) Name() string {
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return Name
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}
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var protoBufferPool = &sync.Pool{
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New: func() interface{} {
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return &cachedProtoBuffer{
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Buffer: proto.Buffer{},
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lastMarshaledSize: 16,
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}
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},
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}
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