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codec_client.go
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codec_client.go
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// Copyright (c) 2019 Meng Huang ([email protected])
// This package is licensed under a MIT license that can be found in the LICENSE file.
package rpc
import (
"errors"
"github.com/hslam/buffer"
"github.com/hslam/socket"
"io"
"sync/atomic"
)
type clientCodec struct {
headerEncoder Encoder
bodyCodec Codec
writeBufSize int
bufferPool *buffer.Pool
messages socket.Messages
closed uint32
}
// NewClientCodec returns a new ClientCodec.
func NewClientCodec(bodyCodec Codec, headerEncoder Encoder, messages socket.Messages, writeBufSize int) ClientCodec {
if messages == nil {
return nil
}
if headerEncoder != nil {
if bodyCodec == nil {
bodyCodec = headerEncoder.NewCodec()
}
}
if bodyCodec == nil {
return nil
}
if writeBufSize < 1 {
writeBufSize = bufferSize
}
c := &clientCodec{
headerEncoder: headerEncoder,
bodyCodec: bodyCodec,
writeBufSize: writeBufSize,
bufferPool: buffer.AssignPool(writeBufSize),
}
c.messages = messages
if set, ok := c.messages.(socket.BufferedOutput); ok {
set.SetBufferedOutput(writeBufSize)
}
return c
}
//SetBufferSize sets buffer size.
func (c *clientCodec) SetBufferSize(size int) {
if size < 1 {
size = bufferSize
}
c.writeBufSize = size
c.bufferPool = buffer.AssignPool(size)
if set, ok := c.messages.(socket.BufferedOutput); ok {
set.SetBufferedOutput(size)
}
}
// SetDirectIO disables async io.
func (c *clientCodec) SetDirectIO(directIO bool) {
if directIO {
if set, ok := c.messages.(socket.BufferedOutput); ok {
set.SetBufferedOutput(c.writeBufSize)
}
} else {
if set, ok := c.messages.(socket.BufferedOutput); ok {
set.SetBufferedOutput(0)
}
}
}
func (c *clientCodec) Messages() socket.Messages {
return c.messages
}
func (c *clientCodec) WriteRequest(ctx *Context, param interface{}) error {
if atomic.LoadUint32(&c.closed) > 0 {
return io.EOF
}
var args []byte
var data []byte
var err error
var argsBuffer []byte
if ctx.upgrade.NoRequest != noRequest {
argsBuffer = c.bufferPool.GetBuffer(0)
args, err = c.bodyCodec.Marshal(argsBuffer, param)
if err != nil {
return err
}
}
var requestBuffer = c.bufferPool.GetBuffer(0)
if c.headerEncoder != nil {
req := c.headerEncoder.NewRequest()
req.SetSeq(ctx.Seq)
req.SetUpgrade(ctx.Upgrade)
req.SetServiceMethod(ctx.ServiceMethod)
req.SetArgs(args)
codec := c.headerEncoder.NewCodec()
data, err = codec.Marshal(requestBuffer, req)
} else {
req := &pbRequest{}
req.SetSeq(ctx.Seq)
req.SetUpgrade(ctx.Upgrade)
req.SetServiceMethod(ctx.ServiceMethod)
req.SetArgs(args)
size := req.Size()
var buf = checkBuffer(requestBuffer, size)
var n int
n, err = req.MarshalTo(buf)
data = buf[:n]
}
if err == nil {
err = c.messages.WriteMessage(data)
}
if ctx.upgrade.NoRequest != noRequest {
c.bufferPool.PutBuffer(argsBuffer)
}
c.bufferPool.PutBuffer(requestBuffer)
return err
}
func (c *clientCodec) ReadResponseHeader(ctx *Context) error {
if atomic.LoadUint32(&c.closed) > 0 {
return io.EOF
}
var data = ctx.data
var err error
if c.headerEncoder != nil {
res := c.headerEncoder.NewResponse()
res.Reset()
codec := c.headerEncoder.NewCodec()
err = codec.Unmarshal(data, res)
if err == nil {
ctx.Seq = res.GetSeq()
ctx.Error = res.GetError()
ctx.value = res.GetReply()
}
} else {
res := &pbResponse{}
res.Reset()
err = res.Unmarshal(data)
if err == nil {
ctx.Seq = res.GetSeq()
ctx.Error = res.GetError()
ctx.value = res.GetReply()
}
}
return err
}
func (c *clientCodec) ReadResponseBody(reply []byte, x interface{}) error {
if x == nil {
return errors.New("x is nil")
}
return c.bodyCodec.Unmarshal(reply, x)
}
func (c *clientCodec) Close() error {
atomic.StoreUint32(&c.closed, 1)
return c.messages.Close()
}