forked from moby/vpnkit
/
stream_proxy.go
61 lines (53 loc) · 1.31 KB
/
stream_proxy.go
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package libproxy
import (
"io"
"net"
"strings"
)
// Conn defines a network connection
type Conn interface {
net.Conn
CloseWrite() error
}
// ProxyStream data between client and backend, until both are at EOF or quit is closed.
func ProxyStream(client, backend Conn, quit <-chan struct{}) error {
event := make(chan int64)
var broker = func(to, from Conn) {
written, err := io.Copy(to, from)
if err != nil && err != io.EOF && !errIsBeingClosed(err) {
log.Println("error copying:", err)
}
err = to.CloseWrite()
if err != nil && !errIsNotConnected(err) && !errIsBeingClosed(err) {
log.Println("error CloseWrite to:", err)
}
event <- written
}
go broker(client, backend)
go broker(backend, client)
var transferred int64
for i := 0; i < 2; i++ {
select {
case written := <-event:
transferred += written
case <-quit:
// Interrupt the two brokers and "join" them.
backend.Close()
for ; i < 2; i++ {
transferred += <-event
}
return nil
}
}
backend.Close()
return nil
}
func errIsNotConnected(err error) bool {
return strings.HasSuffix(err.Error(), "is not connected")
}
func errIsConnectionRefused(err error) bool {
return strings.HasSuffix(err.Error(), "connection refused")
}
func errIsBeingClosed(err error) bool {
return strings.HasSuffix(err.Error(), "is being closed.")
}