func writer(conn net.Conn, outbox chan []byte) {
defer func() {
conn.Close()
clearOutbox(outbox) //incase reader is blocked
}()
b := bytes.NewBuffer(nil)
for {
select {
case msg, ok := <-outbox:
if !ok {
return
}
b.Write(msg)
for n := len(outbox); n > 0; n-- {
b.Write(<-outbox)
}
conn.SetWriteDeadline(time.Now().Add(5 * time.Second))
_, err := conn.Write(b.Bytes())
if err != nil {
return
}
b.Reset()
}
}
}
func serveSPDY(conn net.Conn, srv *http.Server) {
defer func() {
if v := recover(); v != nil {
const size = 4096
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
log.Printf("panic serving %v: %v\n%s", conn.RemoteAddr(), v, buf)
}
}()
tlsConn, ok := conn.(*tls.Conn)
if !ok { // Only allow TLS connections.
return
}
if d := srv.ReadTimeout; d != 0 {
conn.SetReadDeadline(time.Now().Add(d))
}
if d := srv.WriteTimeout; d != 0 {
conn.SetWriteDeadline(time.Now().Add(d))
}
if err := tlsConn.Handshake(); err != nil {
return
}
tlsState := new(tls.ConnectionState)
*tlsState = tlsConn.ConnectionState()
proto := tlsState.NegotiatedProtocol
if fn := srv.TLSNextProto[proto]; fn != nil {
fn(srv, tlsConn, nil)
}
return
}
func copyBytes(dst, src net.Conn, wg *sync.WaitGroup, writeDeadline, readDeadline time.Duration) {
defer wg.Done()
n, err := io.Copy(dst, src)
if err != nil {
log.Errorf("proxy i/o error: %v", err)
}
if cr, ok := src.(*net.TCPConn); ok {
cr.CloseRead()
} else {
// For TLS connections.
wto := time.Now().Add(writeDeadline)
src.SetWriteDeadline(wto)
}
if cw, ok := dst.(*net.TCPConn); ok {
cw.CloseWrite()
} else {
// For TLS connections.
rto := time.Now().Add(readDeadline)
dst.SetReadDeadline(rto)
}
log.Debugf("proxy copied %d bytes %s -> %s", n, src.RemoteAddr(), dst.RemoteAddr())
}
func (s *Server) updateWriteDeadline(c net.Conn, ctx *RequestCtx, lastDeadlineTime time.Time) time.Time {
writeTimeout := s.WriteTimeout
if s.MaxKeepaliveDuration > 0 {
connTimeout := s.MaxKeepaliveDuration - time.Since(ctx.connTime)
if connTimeout <= 0 {
// MaxKeepAliveDuration exceeded, but let's try sending response anyway
// in 100ms with 'Connection: close' header.
ctx.SetConnectionClose()
connTimeout = 100 * time.Millisecond
}
if connTimeout < writeTimeout {
writeTimeout = connTimeout
}
}
// Optimization: update write deadline only if more than 25%
// of the last write deadline exceeded.
// See https://github.com/golang/go/issues/15133 for details.
currentTime := time.Now()
if currentTime.Sub(lastDeadlineTime) > (writeTimeout >> 2) {
if err := c.SetWriteDeadline(currentTime.Add(writeTimeout)); err != nil {
panic(fmt.Sprintf("BUG: error in SetWriteDeadline(%s): %s", writeTimeout, err))
}
lastDeadlineTime = currentTime
}
return lastDeadlineTime
}
func createPeerWriter(conn net.Conn) (chan<- []byte, <-chan error) {
msgChan := make(chan []byte)
errChan := make(chan error)
go func() {
defer log.V(3).Infof("WINSTON: Peer writer goroutine exited\n")
defer close(errChan)
// msgChan should be closed by the caller
for msg := range msgChan {
// Set a deadline for sending the next message and refresh it before each message
conn.SetWriteDeadline(time.Now().Add(30 * time.Second))
err := netWriteUint32(conn, uint32(len(msg)))
if err != nil {
errChan <- fmt.Errorf("Could not send byte of new message: '%s'", err)
break
}
_, err = conn.Write(msg)
if err != nil {
errChan <- fmt.Errorf("Could not send a message: '%s'", err)
break
}
}
}()
return msgChan, errChan
}
// poll sends a packet and wait for a response. Both operations can timeout, they're retried up to retries times.
func poll(conn net.Conn, toSend []byte, respondBuffer []byte, retries int, timeout time.Duration) (int, error) {
var err error
for i := 0; i < retries+1; i++ {
deadline := time.Now().Add(timeout)
if err = conn.SetWriteDeadline(deadline); err != nil {
log.Printf("Couldn't set write deadline. Retrying. Retry %d/%d\n", i, retries)
continue
}
if _, err = conn.Write(toSend); err != nil {
log.Printf("Couldn't write. Retrying. Retry %d/%d\n", i, retries)
continue
}
deadline = time.Now().Add(timeout)
if err = conn.SetReadDeadline(deadline); err != nil {
log.Printf("Couldn't set read deadline. Retrying. Retry %d/%d\n", i, retries)
continue
}
numRead := 0
if numRead, err = conn.Read(respondBuffer); err != nil {
log.Printf("Couldn't read. Retrying. Retry %d/%d\n", i, retries)
continue
}
return numRead, nil
}
return 0, err
}
func copyContent(from net.Conn, to net.Conn, complete chan bool, done chan bool, otherDone chan bool) {
var err error = nil
var bytes []byte = make([]byte, 256)
var read int = 0
for {
select {
// If we received a done message from the other goroutine, we exit.
case <-otherDone:
complete <- true
return
default:
// Read data from the source connection.
from.SetReadDeadline(time.Now().Add(time.Second * 5))
read, err = from.Read(bytes)
// If any errors occured, write to complete as we are done (one of the
// connections closed.)
if err != nil {
complete <- true
done <- true
return
}
// Write data to the destination.
to.SetWriteDeadline(time.Now().Add(time.Second * 5))
_, err = to.Write(bytes[:read])
// Same error checking.
if err != nil {
complete <- true
done <- true
return
}
}
}
}
// testRacyWrite tests that it is safe to mutate the input Write buffer
// immediately after cancelation has occurred.
func testRacyWrite(t *testing.T, c1, c2 net.Conn) {
go chunkedCopy(ioutil.Discard, c2)
var wg sync.WaitGroup
defer wg.Wait()
c1.SetWriteDeadline(time.Now().Add(time.Millisecond))
for i := 0; i < 10; i++ {
wg.Add(1)
go func() {
defer wg.Done()
b1 := make([]byte, 1024)
b2 := make([]byte, 1024)
for j := 0; j < 100; j++ {
_, err := c1.Write(b1)
copy(b1, b2) // Mutate b1 to trigger potential race
if err != nil {
checkForTimeoutError(t, err)
c1.SetWriteDeadline(time.Now().Add(time.Millisecond))
}
}
}()
}
}
func (service *StreamService) serve(conn net.Conn) {
var data []byte
var err error
for {
if service.readTimeout != nil {
err = conn.SetReadDeadline(time.Now().Add(service.readTimeout.(time.Duration)))
}
if err == nil {
data, err = receiveDataOverStream(conn)
}
if err == nil {
data = service.Handle(data, &StreamContext{BaseContext: NewBaseContext(), Conn: conn})
if service.writeTimeout != nil {
err = conn.SetWriteDeadline(time.Now().Add(service.writeTimeout.(time.Duration)))
}
if err == nil {
err = sendDataOverStream(conn, data)
}
}
if err != nil {
conn.Close()
break
}
}
}
// copy Content two-way
func pass(from net.Conn, to net.Conn, complete chan bool, oneSide chan bool, otherSide chan bool) {
var err error
var read int
bytes := make([]byte, 256)
for {
select {
case <-otherSide:
complete <- true
return
default:
from.SetReadDeadline(time.Now().Add(time.Duration(pConfig.Timeout) * time.Second))
read, err = from.Read(bytes)
if err != nil {
complete <- true
oneSide <- true
return
}
to.SetWriteDeadline(time.Now().Add(time.Duration(pConfig.Timeout) * time.Second))
_, err = to.Write(bytes[:read])
if err != nil {
complete <- true
oneSide <- true
return
}
}
}
}
func serveSPDY(conn net.Conn, srv *http.Server) {
defer common.Recover()
tlsConn, ok := conn.(*tls.Conn)
if !ok { // Only allow TLS connections.
return
}
if d := srv.ReadTimeout; d != 0 {
conn.SetReadDeadline(time.Now().Add(d))
}
if d := srv.WriteTimeout; d != 0 {
conn.SetWriteDeadline(time.Now().Add(d))
}
if err := tlsConn.Handshake(); err != nil {
return
}
tlsState := new(tls.ConnectionState)
*tlsState = tlsConn.ConnectionState()
proto := tlsState.NegotiatedProtocol
if fn := srv.TLSNextProto[proto]; fn != nil {
fn(srv, tlsConn, nil)
}
return
}
func (s *session) proxy(c1, c2 net.Conn) error {
if debug {
log.Println("Proxy", c1.RemoteAddr(), "->", c2.RemoteAddr())
}
atomic.AddInt64(&numProxies, 1)
defer atomic.AddInt64(&numProxies, -1)
buf := make([]byte, 65536)
for {
c1.SetReadDeadline(time.Now().Add(networkTimeout))
n, err := c1.Read(buf)
if err != nil {
return err
}
atomic.AddInt64(&bytesProxied, int64(n))
if debug {
log.Printf("%d bytes from %s to %s", n, c1.RemoteAddr(), c2.RemoteAddr())
}
if s.rateLimit != nil {
s.rateLimit(int64(n))
}
c2.SetWriteDeadline(time.Now().Add(networkTimeout))
_, err = c2.Write(buf[:n])
if err != nil {
return err
}
}
}
// copy Content two-way
func pass(from net.Conn, to net.Conn, complete chan bool, one_side chan bool, other_side chan bool) {
var err error = nil
var bytes []byte = make([]byte, 256)
var read int = 0
for {
select {
case <-other_side:
complete <- true
return
default:
from.SetReadDeadline(time.Now().Add(time.Duration(*expire) * time.Second))
read, err = from.Read(bytes)
if err != nil {
complete <- true
one_side <- true
return
}
to.SetWriteDeadline(time.Now().Add(time.Duration(*expire) * time.Second))
_, err = to.Write(bytes[:read])
if err != nil {
complete <- true
one_side <- true
return
}
}
}
}
func WriteMessage(conn net.Conn, timeout time.Duration, msg *Message) error {
var handle = &codec.MsgpackHandle{}
var buf []byte
var encoder = codec.NewEncoderBytes(&buf, handle)
err := encoder.Encode(msg)
if err != nil {
return err
}
length := len(buf)
if length > DefaultMessageLengthCap {
return errors.New("message is too long")
}
var lengthBuf [2]byte
binary.BigEndian.PutUint16(lengthBuf[:], uint16(length))
conn.SetWriteDeadline(time.Now().Add(timeout))
_, err = conn.Write(lengthBuf[:])
if err != nil {
return err
}
_, err = io.Copy(conn, bytes.NewBuffer(buf))
return err
}
func write(conn net.Conn, content []byte, timeout float64) error {
if timeout > 0 {
conn.SetWriteDeadline(time.Now().Add(time.Duration(timeout) * time.Second))
}
_, err := conn.Write(content)
return err
}
func (c *GsiScanClient) sendRequest(
conn net.Conn, pkt *transport.TransportPacket, req interface{}) (err error) {
timeoutMs := c.writeDeadline * time.Millisecond
conn.SetWriteDeadline(time.Now().Add(timeoutMs))
return pkt.Send(conn, req)
}
func NewConn(client *Client, network, addr string, connectTimeout, readTimeout, writeTimeout time.Duration) (*Conn, error) {
client.CountNewConn++
var conn net.Conn
var err error
if connectTimeout > 0 {
conn, err = net.DialTimeout(network, addr, connectTimeout)
} else {
conn, err = net.Dial(network, addr)
}
if err != nil {
return nil, err
}
if readTimeout > 0 {
conn.SetReadDeadline(time.Now().Add(readTimeout))
}
if writeTimeout > 0 {
conn.SetWriteDeadline(time.Now().Add(writeTimeout))
}
this := &Conn{
Conn: conn,
Client: client,
ReadTimeout: readTimeout,
WriteTimeout: writeTimeout,
}
return this, nil
}
func serveSPDYNoNPN(conn net.Conn, srv *http.Server, version, subversion int) {
defer common.Recover()
tlsConn, ok := conn.(*tls.Conn)
if !ok { // Only allow TLS connections.
return
}
if d := srv.ReadTimeout; d != 0 {
conn.SetReadDeadline(time.Now().Add(d))
}
if d := srv.WriteTimeout; d != 0 {
conn.SetWriteDeadline(time.Now().Add(d))
}
if err := tlsConn.Handshake(); err != nil {
return
}
serverConn, err := NewServerConn(tlsConn, srv, version, subversion)
if err != nil {
log.Println(err)
return
}
serverConn.Run()
}
// Send all the bytes, but respect the upload limit (force delays)
func SockWrite(con net.Conn, buf []byte) (n int, e error) {
var tosend int
bw_mutex.Lock()
TickSent()
if UploadLimit == 0 {
tosend = len(buf)
} else {
tosend = int(UploadLimit) - ul_bytes_so_far
if tosend > len(buf) {
tosend = len(buf)
} else if tosend < 0 {
tosend = 0
}
}
ul_bytes_so_far += tosend
bw_mutex.Unlock()
if tosend > 0 {
// Set timeout to prevent thread from getting stuck if the other end does not read
con.SetWriteDeadline(time.Now().Add(250 * time.Millisecond))
n, e = con.Write(buf[:tosend])
bw_mutex.Lock()
UlBytesTotal += uint64(n)
ul_bytes_priod += uint64(n)
bw_mutex.Unlock()
if e != nil {
if nerr, ok := e.(net.Error); ok && nerr.Timeout() {
e = nil
}
}
} else {
time.Sleep(250 * time.Millisecond)
}
return
}
func tcpSend(conn net.Conn, bytesStream []byte, timeout time.Duration) error {
if err := conn.SetWriteDeadline(time.Now().Add(timeout)); err != nil {
return err
}
if _, err := conn.Write(bytesStream); err != nil {
return err
}
return nil
}
func writeMessage(conn net.Conn, m *Message) error {
conn.SetWriteDeadline(time.Now().Add(idleWriteTimeout))
if err := json.NewEncoder(conn).Encode(m); err != nil {
return err
}
// Jon wants double newline after each message.
_, err := conn.Write([]byte("\n\n"))
return err
}
func Send(addr string, conn net.Conn, params ...string) error {
msg := strings.Join(params, " ") + "\n"
log.Printf("%s <- %s", addr, msg)
if err := conn.SetWriteDeadline(time.Now().Add(5 * time.Second)); err != nil {
return err
}
_, err := io.WriteString(conn, msg)
return err
}
func (self *Http) initConnection(conn net.Conn) {
now := time.Now()
readDeadline := now.Add(CONNECTION_READ_TIMEOUT_SECOND * time.Second)
conn.SetReadDeadline(readDeadline)
writeDeadline := readDeadline.Add(CONNECTION_READ_TIMEOUT_SECOND * time.Second)
conn.SetWriteDeadline(writeDeadline)
}
// testWriteTimeout tests that Write timeouts do not affect Read.
func testWriteTimeout(t *testing.T, c1, c2 net.Conn) {
go chunkedCopy(c2, rand.New(rand.NewSource(0)))
c1.SetWriteDeadline(aLongTimeAgo)
_, err := c1.Write(make([]byte, 1024))
checkForTimeoutError(t, err)
if _, err := c1.Read(make([]byte, 1024)); err != nil {
t.Errorf("unexpected Read error: %v", err)
}
}
func (cons *Socket) sendAck(conn net.Conn, success bool) error {
if cons.acknowledge != "" {
var err error
conn.SetWriteDeadline(time.Now().Add(cons.ackTimeout))
if success {
_, err = fmt.Fprint(conn, cons.acknowledge)
} else {
_, err = fmt.Fprint(conn, "NOT "+cons.acknowledge)
}
return err
}
return nil
}
func (this *Server) send(buf []byte, conn net.Conn) error {
conn.SetWriteDeadline(time.Now().Add(this.connTimeout))
num, err := conn.Write(buf)
if err != nil {
return err
}
if num <= 0 {
return fmt.Errorf("connection write back %d bytes error", num)
}
return nil
}
func setupHeartbeat(c net.Conn) {
for {
time.Sleep(1 * time.Second)
c.SetWriteDeadline(time.Now().Add(3 * time.Second))
_, err := c.Write([]byte("ping"))
if err != nil {
l.Log("Couldn't connect to server. Check your network connection, and run client again.")
os.Exit(1)
}
}
}
//发送数据 3秒超时删除连接
func (this *MsgBox) SendMsg(key string, conn net.Conn, msg *SimpleMsg) {
if conn != nil {
conn.SetWriteDeadline(time.Now().Add(time.Second * 3))
_, err := conn.Write(msg.ToData()) //包续传先不管
if err != nil {
conn.Close()
this.Conns.Remove(key)
SysLog.PutLineAsLog(fmt.Sprintf("Msgbox%s SendMsg: %s ERROR:%s", this.BoxId, msg.MsgBody, err.Error()))
}
} else {
this.Conns.Remove(key)
}
}
// Write a packet to the conn.
func (w *FixWriter) WritePacket(conn net.Conn, packet []byte) error {
if w.timeout > 0 {
conn.SetWriteDeadline(time.Now().Add(w.timeout))
} else {
conn.SetWriteDeadline(time.Time{})
}
if _, err := conn.Write(packet); err != nil {
return err
}
return nil
}
// poolWorker sends data to APNS. A different connection receives the APNS responses.
func poolWorker(wg *sync.WaitGroup, manager ConnManager, requests <-chan workerRequest, maxWaitTime int) {
defer wg.Done()
var conn net.Conn = nil
var err error
var closed <-chan bool
lastRequestTime := time.Now()
for request := range requests {
curTime := time.Now()
if conn != nil {
// Ensure we'll automatically reconnect on a request if we know the connection was closed. This is non-blocking.
select {
case <-closed:
conn = nil
default:
}
}
if conn != nil && curTime.Sub(lastRequestTime) > CLOSE_TIMEOUT {
// Close and re-open the connection if the connection has been inactive for over an hour.
conn.Close()
conn = nil
closed = nil
}
lastRequestTime = curTime
if conn == nil {
// Lazily attempt to open a connection. If that fails, tell the requester that the connection failed.
conn, closed, err = manager.NewConn()
if err != nil {
request.Response <- &PermanentError{Err: err}
conn = nil
continue
}
}
deadline := time.Now().Add(time.Duration(maxWaitTime) * time.Second)
conn.SetWriteDeadline(deadline)
err := writen(conn, request.Payload)
if err != nil {
request.Response <- &TemporaryError{Err: err, Endpoint: conn.RemoteAddr()}
conn.Close()
conn = nil
closed = nil
continue
}
request.Response <- nil
}
if conn != nil {
conn.Close()
conn = nil
closed = nil
}
}