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wrap.go
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wrap.go
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/*
* Copyright 2014-2015 Jason Woods.
*
* 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 transports
import (
"net"
"time"
)
// If tls.Conn.Write ever times out it will permanently break, so we cannot use
// SetWriteDeadline with it directly. So we wrap the given tcpsocket and handle
// the SetWriteDeadline there and check shutdown signal and loop. Inside
// tls.Conn the Write blocks until it finishes and everyone is happy
type transportTCPWrap struct {
transport *TransportTCP
tcpsocket net.Conn
net.Conn
}
func (w *transportTCPWrap) Read(b []byte) (int, error) {
return w.tcpsocket.Read(b)
}
func (w *transportTCPWrap) Write(b []byte) (n int, err error) {
length := 0
RetrySend:
for {
// Timeout after socket_interval_seconds, check for shutdown, and try again
w.tcpsocket.SetWriteDeadline(time.Now().Add(socketIntervalSeconds * time.Second))
n, err = w.tcpsocket.Write(b[length:])
length += n
if length >= len(b) {
return length, err
}
if err == nil {
// Keep trying
continue
}
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
// Check for shutdown, then try again
select {
case <-w.transport.sendControl:
// Shutdown
return length, err
default:
goto RetrySend
}
}
return length, err
} /* loop forever */
}
func (w *transportTCPWrap) Close() error {
return w.tcpsocket.Close()
}
func (w *transportTCPWrap) LocalAddr() net.Addr {
return w.tcpsocket.LocalAddr()
}
func (w *transportTCPWrap) RemoteAddr() net.Addr {
return w.tcpsocket.RemoteAddr()
}
func (w *transportTCPWrap) SetDeadline(t time.Time) error {
return w.tcpsocket.SetDeadline(t)
}
func (w *transportTCPWrap) SetReadDeadline(t time.Time) error {
return w.tcpsocket.SetReadDeadline(t)
}
func (w *transportTCPWrap) SetWriteDeadline(t time.Time) error {
return w.tcpsocket.SetWriteDeadline(t)
}