mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-07 01:26:43 +00:00
105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
![]() |
/*
|
||
|
*
|
||
|
* Copyright 2014 gRPC authors.
|
||
|
*
|
||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
* you may not use this file except in compliance with the License.
|
||
|
* You may obtain a copy of the License at
|
||
|
*
|
||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
*
|
||
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
* See the License for the specific language governing permissions and
|
||
|
* limitations under the License.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
package grpc
|
||
|
|
||
|
import (
|
||
|
"math"
|
||
|
"sync"
|
||
|
|
||
|
"github.com/golang/protobuf/proto"
|
||
|
)
|
||
|
|
||
|
// Codec defines the interface gRPC uses to encode and decode messages.
|
||
|
// Note that implementations of this interface must be thread safe;
|
||
|
// a Codec's methods can be called from concurrent goroutines.
|
||
|
type Codec interface {
|
||
|
// Marshal returns the wire format of v.
|
||
|
Marshal(v interface{}) ([]byte, error)
|
||
|
// Unmarshal parses the wire format into v.
|
||
|
Unmarshal(data []byte, v interface{}) error
|
||
|
// String returns the name of the Codec implementation. The returned
|
||
|
// string will be used as part of content type in transmission.
|
||
|
String() string
|
||
|
}
|
||
|
|
||
|
// protoCodec is a Codec implementation with protobuf. It is the default codec for gRPC.
|
||
|
type protoCodec struct {
|
||
|
}
|
||
|
|
||
|
type cachedProtoBuffer struct {
|
||
|
lastMarshaledSize uint32
|
||
|
proto.Buffer
|
||
|
}
|
||
|
|
||
|
func capToMaxInt32(val int) uint32 {
|
||
|
if val > math.MaxInt32 {
|
||
|
return uint32(math.MaxInt32)
|
||
|
}
|
||
|
return uint32(val)
|
||
|
}
|
||
|
|
||
|
func (p protoCodec) marshal(v interface{}, cb *cachedProtoBuffer) ([]byte, error) {
|
||
|
protoMsg := v.(proto.Message)
|
||
|
newSlice := make([]byte, 0, cb.lastMarshaledSize)
|
||
|
|
||
|
cb.SetBuf(newSlice)
|
||
|
cb.Reset()
|
||
|
if err := cb.Marshal(protoMsg); err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
out := cb.Bytes()
|
||
|
cb.lastMarshaledSize = capToMaxInt32(len(out))
|
||
|
return out, nil
|
||
|
}
|
||
|
|
||
|
func (p protoCodec) Marshal(v interface{}) ([]byte, error) {
|
||
|
cb := protoBufferPool.Get().(*cachedProtoBuffer)
|
||
|
out, err := p.marshal(v, cb)
|
||
|
|
||
|
// put back buffer and lose the ref to the slice
|
||
|
cb.SetBuf(nil)
|
||
|
protoBufferPool.Put(cb)
|
||
|
return out, err
|
||
|
}
|
||
|
|
||
|
func (p protoCodec) Unmarshal(data []byte, v interface{}) error {
|
||
|
cb := protoBufferPool.Get().(*cachedProtoBuffer)
|
||
|
cb.SetBuf(data)
|
||
|
v.(proto.Message).Reset()
|
||
|
err := cb.Unmarshal(v.(proto.Message))
|
||
|
cb.SetBuf(nil)
|
||
|
protoBufferPool.Put(cb)
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
func (protoCodec) String() string {
|
||
|
return "proto"
|
||
|
}
|
||
|
|
||
|
var (
|
||
|
protoBufferPool = &sync.Pool{
|
||
|
New: func() interface{} {
|
||
|
return &cachedProtoBuffer{
|
||
|
Buffer: proto.Buffer{},
|
||
|
lastMarshaledSize: 16,
|
||
|
}
|
||
|
},
|
||
|
}
|
||
|
)
|