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session.go
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session.go
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package pmux
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"log"
"math"
"net"
"strings"
"sync"
"sync/atomic"
"time"
)
// sendReady is used to either mark a stream as ready
// or to directly send a header
type sendReady struct {
F LenFrame
Err chan error
}
type Session struct {
nextStreamID uint32
config *Config
conn io.ReadWriteCloser
connReader *bufio.Reader
connWriter io.Writer
// bufRead is a buffered reader
//bufRead *bufio.Reader
//streams map[uint32]*Stream
//streamLock sync.Mutex
streams sync.Map
streamsCounter int32
acceptCh chan *Stream
sendCh chan sendReady
pingCh chan struct{}
shutdown int32
shutdownErr error
shutdownCh chan struct{}
shutdownLock sync.Mutex
initCh chan struct{}
handshakeDone bool
acceptable bool
cryptoContext *CryptoContext
lastRecvTime time.Time
sendingNum int32
lenbuf [4]byte
}
func (s *Session) IsShutdown() bool {
return atomic.LoadInt32(&s.shutdown) > 0
}
// keepalive is a long running goroutine that periodically does
// a ping to keep the connection alive.
func (s *Session) keepalive() {
for !s.IsShutdown() {
select {
case <-time.After(s.config.KeepAliveInterval):
_, err := s.Ping()
if err != nil {
log.Printf("[ERR] pmux: keepalive failed: %v", err)
if err == ErrTimeout {
s.Close()
return
}
}
case <-s.shutdownCh:
return
}
}
}
// Ping is used to measure the RTT response time
func (s *Session) Ping() (time.Duration, error) {
// Send the ping request
pingTimeout := time.After(s.config.PingTimeout)
err := s.writeFrameNowait(newLenFrame(flagPing, 0, 0, nil), pingTimeout)
if nil != err {
return 0, err
}
// Wait for a response
start := time.Now()
select {
case <-s.pingCh:
case <-pingTimeout:
if time.Now().Sub(s.lastRecvTime) >= s.config.PingTimeout {
return 0, ErrTimeout
}
return s.config.PingTimeout, nil
case <-s.shutdownCh:
return 0, ErrSessionShutdown
}
// Compute the RTT
return time.Now().Sub(start), nil
}
func (s *Session) closeRemoteStream(id uint32, sync bool) error {
var timeout <-chan time.Time
var err error
if sync {
err = s.writeFrame(newLenFrame(flagFIN, id, 0, nil), timeout)
} else {
err = s.writeFrameNowait(newLenFrame(flagFIN, id, 0, nil), timeout)
}
if nil != err {
log.Printf("[WARN] pmux: failed to close remote: %v", err)
}
return err
}
func (s *Session) doWriteFrame(frame LenFrame, noWait bool, timeout <-chan time.Time) error {
atomic.AddInt32(&s.sendingNum, 1)
if s.IsShutdown() {
atomic.AddInt32(&s.sendingNum, -1)
//putBytesToPool(frame)
return ErrSessionShutdown
}
defer atomic.AddInt32(&s.sendingNum, -1)
ready := sendReady{F: frame, Err: nil}
if !noWait {
ready.Err = make(chan error, 1)
}
select {
case s.sendCh <- ready:
case <-s.shutdownCh:
//putBytesToPool(frame)
return ErrSessionShutdown
case <-timeout:
//putBytesToPool(frame)
return ErrConnectionWriteTimeout
}
if !noWait {
select {
case err := <-ready.Err:
return err
case <-s.shutdownCh:
return ErrSessionShutdown
case <-timeout:
return ErrConnectionWriteTimeout
}
}
return nil
}
func (s *Session) writeFrame(frame LenFrame, timeout <-chan time.Time) error {
return s.doWriteFrame(frame, false, timeout)
}
func (s *Session) writeFrameNowait(frame LenFrame, timeout <-chan time.Time) error {
return s.doWriteFrame(frame, true, timeout)
}
func (s *Session) updateWindow(sid uint32, delta uint32) error {
var timeout <-chan time.Time
frame := newLenFrame(flagWindowUpdate, sid, delta, nil)
return s.writeFrameNowait(frame, timeout)
}
func (s *Session) incomingStream(id uint32) (*Stream, error) {
//s.streamLock.Lock()
ss := newStream(s, id)
if _, loaded := s.streams.LoadOrStore(id, ss); loaded {
log.Printf("[ERR]: duplicate stream declared")
s.closeRemoteStream(id, false)
return nil, ErrDuplicateStream
}
atomic.AddInt32(&s.streamsCounter, 1)
return ss, nil
}
func (s *Session) getStream(sid uint32) *Stream {
//s.streamLock.Lock()
stream, exist := s.streams.Load(sid)
//s.streamLock.Unlock()
if exist {
return stream.(*Stream)
}
return nil
}
func (s *Session) removeStream(sid uint32) {
//s.streamLock.Lock()
//delete(s.streams, sid)
//s.streamLock.Unlock()
s.streams.Delete(sid)
atomic.AddInt32(&s.streamsCounter, -1)
}
func (s *Session) exitErr(err error) {
s.shutdownLock.Lock()
if s.shutdownErr == nil {
s.shutdownErr = err
}
s.shutdownLock.Unlock()
s.Close()
}
func (s *Session) recv() {
if err := s.recvLoop(); err != nil {
s.exitErr(err)
}
}
func (s *Session) resetCryptoContext(method string, iv uint64, wait bool) error {
if wait {
var timeout <-chan time.Time
s.writeFrame(nil, timeout)
}
ctx, err := NewCryptoContext(method, s.config.CipherKey, iv)
if nil != err {
return err
}
//ctx.encryptCounter = ctx.decryptCounter =
s.cryptoContext = ctx
return nil
}
func (s *Session) ResetCryptoContext(method string, iv uint64) error {
return s.resetCryptoContext(method, iv, true)
}
func (s *Session) recvFrame(reader io.Reader) (Frame, error) {
//lenbuf := make([]byte, 4)
_, err := io.ReadAtLeast(reader, s.lenbuf[:], len(s.lenbuf))
if nil != err {
return nil, err
}
ctx := s.cryptoContext
length := binary.BigEndian.Uint32(s.lenbuf[:])
length = ctx.decodeLength(length)
//log.Printf("[Recv]Read len:%d %d %d", length, binary.BigEndian.Uint32(lenbuf), ctx.decryptCounter)
if length > maxDataPacketSize {
return nil, ErrToolargeDataFrame
}
buf := make([]byte, length)
//buf := getBytesFromPool(int(length))
_, err = io.ReadAtLeast(reader, buf, len(buf))
if nil != err {
return nil, err
}
buf, err = ctx.decodeData(buf)
if nil != err {
return nil, err
}
frame := Frame(buf)
// frame := &Frame{}
// frame.Header = FrameHeader(buf[0:HeaderLenV1])
// frame.Body = buf[HeaderLenV1:]
//log.Printf("[Recv]Read frame %d %d %d %d %d", length, frame.Header().Flags(), frame.Header().StreamID(), len(frame.Body()), ctx.decryptCounter)
ctx.incDecryptCounter()
if frame.Header().Version() != FrameProtoVersion {
return nil, fmt.Errorf("Invalid proto version:%d with data len:%d, flag:%d", frame.Header().Version(), length, frame.Header().Flags())
}
return frame, nil
}
func (s *Session) recvLoop() error {
for !s.IsShutdown() {
// Read the frame
var frame Frame
var err error
if frame, err = s.recvFrame(s.connReader); err != nil {
if err != io.EOF && !strings.Contains(err.Error(), "closed") && !strings.Contains(err.Error(), "reset by peer") {
log.Printf("[ERROR]: Failed to read frame: %v while decrypt counter %d ", err, s.cryptoContext.decryptCounter)
}
return err
}
s.lastRecvTime = time.Now()
//log.Printf("####Recv %d", frame.Header.Flags())
// Switch on the type
switch frame.Header().Flags() {
case flagData:
err = s.handleData(frame)
case flagSYN:
err = s.handleSYN(frame)
//putBytesToPool(frame)
case flagFIN:
err = s.handleFIN(frame)
//putBytesToPool(frame)
case flagWindowUpdate:
err = s.handleWindowUpdate(frame)
//putBytesToPool(frame)
case flagPing:
var timeout <-chan time.Time
s.writeFrameNowait(newLenFrame(flagPingACK, frame.Header().StreamID(), 0, nil), timeout)
//putBytesToPool(frame)
case flagPingACK:
asyncNotify(s.pingCh)
//fmt.Printf("####Recv flagPingACK\n")
//putBytesToPool(frame)
default:
return ErrInvalidMsgType
}
}
return ErrSessionShutdown
}
func (s *Session) handleWindowUpdate(frame Frame) error {
stream := s.getStream(frame.Header().StreamID())
if nil != stream {
stream.incrSendWindow(frame)
} else {
s.closeRemoteStream(frame.Header().StreamID(), false)
}
return nil
}
func (s *Session) handleData(frame Frame) error {
stream := s.getStream(frame.Header().StreamID())
if nil != stream {
return stream.offerData(frame)
} else {
s.closeRemoteStream(frame.Header().StreamID(), false)
//putBytesToPool(frame)
}
return nil
}
func (s *Session) handleSYN(frame Frame) error {
stream, err := s.incomingStream(frame.Header().StreamID())
if nil == err {
if !s.acceptable {
log.Printf("[WARN] pmux: close incoming stream since current session is not acceptable.")
stream.Close()
return nil
}
stream.state = streamAccepting
select {
case s.acceptCh <- stream:
return nil
default:
// Backlog exceeded! RST the stream
log.Printf("[WARN] pmux: backlog exceeded:%d, forcing connection reset", len(s.acceptCh))
stream.Close()
}
return nil
}
return nil
}
func (s *Session) handleFIN(frame Frame) error {
stream := s.getStream(frame.Header().StreamID())
if nil != stream {
//log.Printf("[%d]passive close stream", stream.ID())
stream.forceClose(true)
}
return nil
}
// send is a long running goroutine that sends data
func (s *Session) send() {
readFrames := func() ([]sendReady, error) {
var frs []sendReady
for len(s.sendCh) > 0 {
frame := <-s.sendCh
frs = append(frs, frame)
}
if len(frs) == 0 {
select {
case frame := <-s.sendCh:
frs = append(frs, frame)
case <-s.shutdownCh:
return frs, ErrSessionShutdown
}
}
return frs, nil
}
for !s.IsShutdown() {
frs, err := readFrames()
var wbuffers net.Buffers
if nil == err {
for _, frame := range frs {
wbuffers, err = encodeFrameToBuffers(wbuffers, frame.F, s.cryptoContext)
//err = writeFrame(s.connWriter, frame.F, s.cryptoContext)
//putBytesToPool(frame.F)
if nil != err {
break
}
}
}
if len(wbuffers) > 0 {
_, err = wbuffers.WriteTo(s.connWriter)
}
for _, frame := range frs {
//putBytesToPool(frame.F)
if nil != frame.Err {
asyncSendErr(frame.Err, err)
}
}
if err != nil {
if err != ErrSessionShutdown {
log.Printf("[ERR] pmux: Failed to write frames: %v", err)
}
s.exitErr(err)
return
}
}
}
func (s *Session) NumStreams() int {
return int(s.streamsCounter)
}
// Close is used to close the session and all streams.
// Attempts to send a GoAway before closing the connection.
func (s *Session) Close() error {
s.shutdownLock.Lock()
defer s.shutdownLock.Unlock()
if s.IsShutdown() {
return nil
}
atomic.StoreInt32(&s.shutdown, 1)
if s.shutdownErr == nil {
s.shutdownErr = ErrSessionShutdown
}
asyncNotify(s.shutdownCh)
select {
case s.acceptCh <- nil:
default:
}
close(s.shutdownCh)
s.conn.Close()
//s.streamLock.Lock()
//defer s.streamLock.Unlock()
s.streams.Range(func(key, value interface{}) bool {
stream := value.(*Stream)
stream.forceClose(true)
return true
})
//for len(s.sendCh) > 0 {
//frame := <-s.sendCh
//putBytesToPool(frame.F)
//}
//RecycleBufReaderToPool(s.connReader)
for atomic.LoadInt32(&s.sendingNum) > 0 {
time.Sleep(10 * time.Nanosecond)
}
close(s.sendCh)
return nil
}
// AcceptStream is used to block until the next available stream
// is ready to be accepted.
func (s *Session) AcceptStream() (*Stream, error) {
if s.IsShutdown() {
return nil, ErrSessionShutdown
}
s.acceptable = true
select {
case stream := <-s.acceptCh:
if nil == stream {
return nil, ErrSessionShutdown
}
stream.state = streamEstablished
return stream, nil
case <-s.shutdownCh:
return nil, ErrSessionShutdown
}
}
// IsClosed does a safe check to see if we have shutdown
func (s *Session) IsClosed() bool {
return s.IsShutdown()
}
// OpenStream is used to create a new stream
func (s *Session) OpenStream() (*Stream, error) {
if s.IsClosed() {
return nil, ErrSessionShutdown
}
GET_ID:
// Get an ID, and check for stream exhaustion
id := atomic.LoadUint32(&s.nextStreamID)
if id >= math.MaxUint32-1 {
return nil, ErrStreamsExhausted
}
if !atomic.CompareAndSwapUint32(&s.nextStreamID, id, id+2) {
goto GET_ID
}
// Register the stream
stream := newStream(s, id)
s.streams.Store(id, stream)
atomic.AddInt32(&s.streamsCounter, 1)
var timeout <-chan time.Time
err := s.writeFrame(newLenFrame(flagSYN, id, 0, nil), timeout)
if nil != err {
return nil, err
}
return stream, nil
}
func newSession(config *Config, conn io.ReadWriteCloser, client bool) *Session {
s := &Session{
config: config,
// logger: log.New(config.LogOutput, "", log.LstdFlags),
conn: conn,
connReader: bufio.NewReader(conn),
connWriter: conn,
// pings: make(map[uint32]chan struct{}),
//streams: make(map[uint32]*Stream),
// inflight: make(map[uint32]struct{}),
// synCh: make(chan struct{}, config.AcceptBacklog),
acceptCh: make(chan *Stream, 8),
sendCh: make(chan sendReady, config.WriteQueueLimit),
// recvDoneCh: make(chan struct{}),
shutdownCh: make(chan struct{}),
pingCh: make(chan struct{}),
}
//default cipher
err := s.resetCryptoContext(s.config.CipherMethod, s.config.CipherInitialCounter, false)
if nil != err {
panic(err)
}
if config.EnableCompress {
//s.connReader = snappy.NewReader(s.connReader)
//s.connWriter = snappy.NewWriter(s.connWriter)
}
if client {
s.nextStreamID = 1
} else {
s.nextStreamID = 2
}
go s.recv()
go s.send()
if config.EnableKeepAlive {
go s.keepalive()
}
return s
}