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package ws
import (
"io"
"github.com/gorilla/websocket"
"github.com/lxc/incus/v6/shared/logger"
)
// Proxy mirrors the traffic between two websockets.
func Proxy(source *websocket.Conn, target *websocket.Conn) chan struct{} {
logger.Debug("Websocket: Started proxy", logger.Ctx{"source": source.RemoteAddr().String(), "target": target.RemoteAddr().String()})
// Forwarder between two websockets, closes channel upon disconnection.
forward := func(in *websocket.Conn, out *websocket.Conn, ch chan struct{}) {
for {
mt, r, err := in.NextReader()
if err != nil {
break
}
w, err := out.NextWriter(mt)
if err != nil {
break
}
_, err = io.Copy(w, r)
w.Close()
if err != nil {
break
}
}
close(ch)
}
// Spawn forwarders in both directions.
chSend := make(chan struct{})
go forward(source, target, chSend)
chRecv := make(chan struct{})
go forward(target, source, chRecv)
// Close main channel and disconnect upon completion of either forwarder.
ch := make(chan struct{})
go func() {
select {
case <-chSend:
case <-chRecv:
}
source.Close()
target.Close()
logger.Debug("Websocket: Stopped proxy", logger.Ctx{"source": source.RemoteAddr().String(), "target": target.RemoteAddr().String()})
close(ch)
}()
return ch
}
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