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client_handler.go
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/
client_handler.go
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/*
* Copyright 2021 CloudWeGo 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 netpollmux
import (
"context"
"fmt"
"net"
"sync/atomic"
stats2 "github.com/cloudwego/kitex/internal/stats"
"github.com/cloudwego/kitex/pkg/kerrors"
"github.com/cloudwego/kitex/pkg/klog"
"github.com/cloudwego/kitex/pkg/remote"
"github.com/cloudwego/kitex/pkg/remote/codec"
"github.com/cloudwego/kitex/pkg/remote/trans"
np "github.com/cloudwego/kitex/pkg/remote/trans/netpoll"
"github.com/cloudwego/kitex/pkg/serviceinfo"
"github.com/cloudwego/kitex/pkg/stats"
"github.com/cloudwego/netpoll"
)
type cliTransHandlerFactory struct{}
// NewCliTransHandlerFactory creates a new netpollmux client transport handler factory.
func NewCliTransHandlerFactory() remote.ClientTransHandlerFactory {
return &cliTransHandlerFactory{}
}
// NewTransHandler implements the remote.ClientTransHandlerFactory interface.
func (f *cliTransHandlerFactory) NewTransHandler(opt *remote.ClientOption) (remote.ClientTransHandler, error) {
if _, ok := opt.ConnPool.(*MuxPool); !ok {
return nil, fmt.Errorf("ConnPool[%T] invalid, netpoll mux just suppot MuxPool", opt.ConnPool)
}
return newCliTransHandler(opt)
}
func newCliTransHandler(opt *remote.ClientOption) (*cliTransHandler, error) {
return &cliTransHandler{
opt: opt,
codec: opt.Codec,
}, nil
}
var _ remote.ClientTransHandler = &cliTransHandler{}
type cliTransHandler struct {
opt *remote.ClientOption
codec remote.Codec
transPipe *remote.TransPipeline
}
// Write implements the remote.ClientTransHandler interface.
func (t *cliTransHandler) Write(ctx context.Context, conn net.Conn, sendMsg remote.Message) (err error) {
ri := sendMsg.RPCInfo()
stats2.Record(ctx, ri, stats.WriteStart, nil)
buf := netpoll.NewLinkBuffer()
bufWriter := np.NewWriterByteBuffer(buf)
defer func() {
if err != nil {
buf.Close()
bufWriter.Release(err)
}
stats2.Record(ctx, ri, stats.WriteFinish, nil)
}()
// Set header flag = 1
tags := sendMsg.Tags()
if tags == nil {
tags = make(map[string]interface{})
}
tags[codec.HeaderFlagsKey] = codec.HeaderFlagSupportOutOfOrder
// encode
sendMsg.SetPayloadCodec(t.opt.PayloadCodec)
err = t.codec.Encode(ctx, sendMsg, bufWriter)
if err != nil {
return err
}
mc, _ := conn.(*muxCliConn)
// if oneway
var methodInfo serviceinfo.MethodInfo
if methodInfo, err = trans.GetMethodInfo(ri, sendMsg.ServiceInfo()); err != nil {
return err
}
if methodInfo.OneWay() {
mc.Put(func() (_ netpoll.Writer, isNil bool) {
return buf, false
})
return nil
}
// add notify
seqID := ri.Invocation().SeqID()
callback := newAsyncCallback(buf, bufWriter)
mc.seqIDMap.store(seqID, callback)
mc.Put(callback.getter)
return err
}
// Read implements the remote.ClientTransHandler interface.
func (t *cliTransHandler) Read(ctx context.Context, conn net.Conn, msg remote.Message) (err error) {
ri := msg.RPCInfo()
mc, _ := conn.(*muxCliConn)
seqID := ri.Invocation().SeqID()
// load & delete before return
event, _ := mc.seqIDMap.load(seqID)
defer mc.seqIDMap.delete(seqID)
callback, _ := event.(*asyncCallback)
defer callback.Close()
readTimeout := trans.GetReadTimeout(ri.Config())
if readTimeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, readTimeout)
defer cancel()
}
select {
case <-ctx.Done():
// timeout
return fmt.Errorf("recv wait timeout %s, seqID=%d", readTimeout, seqID)
case err := <-callback.notifyChan:
// recv
if err != nil {
return err
}
stats2.Record(ctx, ri, stats.ReadStart, nil)
msg.SetPayloadCodec(t.opt.PayloadCodec)
err = t.codec.Decode(ctx, msg, callback.bufReader)
stats2.Record(ctx, ri, stats.ReadFinish, err)
return err
}
}
// OnMessage implements the remote.ClientTransHandler interface.
func (t *cliTransHandler) OnMessage(ctx context.Context, args, result remote.Message) (context.Context, error) {
// do nothing
return ctx, nil
}
// OnInactive implements the remote.ClientTransHandler interface.
func (t *cliTransHandler) OnInactive(ctx context.Context, conn net.Conn) {
// ineffective now and do nothing
}
// OnError implements the remote.ClientTransHandler interface.
func (t *cliTransHandler) OnError(ctx context.Context, err error, conn net.Conn) {
if pe, ok := err.(*kerrors.DetailedError); ok {
klog.CtxErrorf(ctx, "KITEX: send request error, remote=%s, error=%s\nstack=%s", conn.RemoteAddr(), err.Error(), pe.Stack())
} else {
klog.CtxErrorf(ctx, "KITEX: send request error, remote=%s, error=%s", conn.RemoteAddr(), err.Error())
}
}
// SetPipeline implements the remote.ClientTransHandler interface.
func (t *cliTransHandler) SetPipeline(p *remote.TransPipeline) {
t.transPipe = p
}
type asyncCallback struct {
wbuf *netpoll.LinkBuffer
bufWriter remote.ByteBuffer
bufReader remote.ByteBuffer
notifyChan chan error
closed int32 // 1 is closed, 2 means wbuf has been flush
}
func newAsyncCallback(wbuf *netpoll.LinkBuffer, bufWriter remote.ByteBuffer) *asyncCallback {
return &asyncCallback{
wbuf: wbuf,
bufWriter: bufWriter,
notifyChan: make(chan error, 1),
}
}
// Recv is called when receive a message.
func (c *asyncCallback) Recv(bufReader remote.ByteBuffer, err error) error {
c.bufReader = bufReader
c.notify(err)
return nil
}
// Close is used to close the mux connection.
func (c *asyncCallback) Close() error {
if atomic.CompareAndSwapInt32(&c.closed, 0, 1) {
c.wbuf.Close()
c.bufWriter.Release(nil)
}
if c.bufReader != nil {
if l := c.bufReader.ReadableLen(); l > 0 {
c.bufReader.Skip(l)
}
c.bufReader.Release(nil)
}
return nil
}
func (c *asyncCallback) notify(err error) {
select {
case c.notifyChan <- err:
default:
}
}
func (c *asyncCallback) getter() (w netpoll.Writer, isNil bool) {
if atomic.CompareAndSwapInt32(&c.closed, 0, 2) {
return c.wbuf, false
}
return nil, true
}