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sender.go
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sender.go
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package sender
import (
"fmt"
"io"
"sync"
"sync/atomic"
"time"
"github.com/fatedier/fft/pkg/stream"
"github.com/fatedier/golib/control/shutdown"
)
type AckWaitingObj struct {
Frame *stream.Frame
HasAck bool
LastSendTime time.Time
}
type Sender struct {
id uint32
// each frame size
frameSize int
// send src to remote Receiver
src io.Reader
frameCh chan *SendFrame
// get each ack message from ackCh
ackCh chan *stream.Ack
retryFrames []*SendFrame
maxBufferCount int
limiter chan struct{}
waitAcks map[uint32]*SendFrame
bufferFrames []*SendFrame
// 1 means all frames has been sent
sendAll bool
mu sync.Mutex
sendShutdown *shutdown.Shutdown
ackShutdown *shutdown.Shutdown
count uint32
}
func NewSender(id uint32, src io.Reader, frameSize int, maxBufferCount int) (*Sender, error) {
if !stream.IsValidFrameSize(frameSize) {
return nil, fmt.Errorf("invalid frameSize")
}
if maxBufferCount <= 0 {
maxBufferCount = 100
}
s := &Sender{
id: id,
frameSize: frameSize,
src: src,
frameCh: make(chan *SendFrame),
ackCh: make(chan *stream.Ack),
maxBufferCount: maxBufferCount,
retryFrames: make([]*SendFrame, 0),
limiter: make(chan struct{}, maxBufferCount),
waitAcks: make(map[uint32]*SendFrame),
bufferFrames: make([]*SendFrame, 0),
sendShutdown: shutdown.New(),
ackShutdown: shutdown.New(),
}
for i := 0; i < maxBufferCount; i++ {
s.limiter <- struct{}{}
}
return s, nil
}
func (sender *Sender) HandleStream(s *stream.FrameStream) {
sender.mu.Lock()
if sender.sendAll {
sender.mu.Unlock()
s.Close()
return
}
sender.mu.Unlock()
id := atomic.AddUint32(&sender.count, 1)
trBufferCount := sender.maxBufferCount / 2
if trBufferCount <= 0 {
trBufferCount = 1
}
tr := NewTransfer(int(id), trBufferCount, s, sender.frameCh, sender.ackCh)
// block until transfer exit
noAckFrames := tr.Run()
if len(noAckFrames) > 0 {
sender.mu.Lock()
sender.retryFrames = append(sender.retryFrames, noAckFrames...)
sender.mu.Unlock()
for i := 0; i < len(noAckFrames); i++ {
sender.limiter <- struct{}{}
}
}
}
func (sender *Sender) Run() {
go sender.ackHandler()
go sender.loopSend()
sender.sendShutdown.WaitDone()
sender.ackShutdown.WaitDone()
}
func (sender *Sender) loopSend() {
defer sender.sendShutdown.Done()
var count uint32
for {
<-sender.limiter
// retry first
var retryFrame *SendFrame
sender.mu.Lock()
if len(sender.retryFrames) > 0 {
retryFrame = sender.retryFrames[0]
sender.retryFrames = sender.retryFrames[1:]
}
sender.mu.Unlock()
if retryFrame != nil {
sender.frameCh <- retryFrame
continue
}
// don't need get frames from src
if sender.sendAll {
continue
}
// no retry frames, get a new frame from src
buf := make([]byte, sender.frameSize)
n, err := sender.src.Read(buf)
if err == io.EOF {
// send last frame and it's buffer is nil
f := stream.NewFrame(sender.id, count, nil)
sf := NewSendFrame(f)
sender.mu.Lock()
sender.sendAll = true
sender.waitAcks[sf.FrameID()] = sf
sender.bufferFrames = append(sender.bufferFrames, sf)
sender.mu.Unlock()
sender.frameCh <- sf
return
}
if err != nil {
close(sender.frameCh)
return
}
buf = buf[:n]
// send frames to transfers
f := stream.NewFrame(0, count, buf)
sf := NewSendFrame(f)
sender.mu.Lock()
sender.waitAcks[sf.FrameID()] = sf
sender.bufferFrames = append(sender.bufferFrames, sf)
sender.mu.Unlock()
sender.frameCh <- sf
count++
}
}
func (sender *Sender) ackHandler() {
defer sender.ackShutdown.Done()
for {
ack, ok := <-sender.ackCh
if !ok {
return
}
finished := false
sender.mu.Lock()
waitSendFrame, ok := sender.waitAcks[ack.FrameID]
if ok {
waitSendFrame.SetAck()
delete(sender.waitAcks, ack.FrameID)
// if all frames has been sent and no waiting acks, we are success
if sender.sendAll && len(sender.waitAcks) == 0 {
finished = true
}
removeCount := 0
// remove all continuous buffer frames with ack
for _, sf := range sender.bufferFrames {
if sf.HasAck() {
removeCount++
sender.limiter <- struct{}{}
} else {
break
}
}
sender.bufferFrames = sender.bufferFrames[removeCount:]
}
sender.mu.Unlock()
if finished {
close(sender.ackCh)
close(sender.frameCh)
close(sender.limiter)
return
}
}
}