micro/tunnel/listener.go
2019-09-03 15:56:37 +01:00

116 lines
2.3 KiB
Go

package tunnel
import (
"io"
"github.com/micro/go-micro/util/log"
)
type tunListener struct {
// address of the listener
channel string
// the accept channel
accept chan *session
// the channel to close
closed chan bool
// the tunnel closed channel
tunClosed chan bool
// the listener session
session *session
}
func (t *tunListener) process() {
// our connection map for session
conns := make(map[string]*session)
for {
select {
case <-t.closed:
return
// receive a new message
case m := <-t.session.recv:
// get a session
sess, ok := conns[m.session]
log.Debugf("Tunnel listener received channel %s session %s exists: %t", m.channel, m.session, ok)
if !ok {
// create a new session session
sess = &session{
// the id of the remote side
tunnel: m.tunnel,
// the channel
channel: m.channel,
// the session id
session: m.session,
// is loopback conn
loopback: m.loopback,
// the link the message was received on
link: m.link,
// close chan
closed: make(chan bool),
// recv called by the acceptor
recv: make(chan *message, 128),
// use the internal send buffer
send: t.session.send,
// wait
wait: make(chan bool),
// error channel
errChan: make(chan error, 1),
}
// save the session
conns[m.session] = sess
// send to accept chan
select {
case <-t.closed:
return
case t.accept <- sess:
}
}
// send this to the accept chan
select {
case <-sess.closed:
delete(conns, m.session)
case sess.recv <- m:
log.Debugf("Tunnel listener sent to recv chan channel %s session %s", m.channel, m.session)
}
}
}
}
func (t *tunListener) Channel() string {
return t.channel
}
// Close closes tunnel listener
func (t *tunListener) Close() error {
select {
case <-t.closed:
return nil
default:
close(t.closed)
}
return nil
}
// Everytime accept is called we essentially block till we get a new connection
func (t *tunListener) Accept() (Session, error) {
select {
// if the session is closed return
case <-t.closed:
return nil, io.EOF
case <-t.tunClosed:
// close the listener when the tunnel closes
t.Close()
return nil, io.EOF
// wait for a new connection
case c, ok := <-t.accept:
if !ok {
return nil, io.EOF
}
return c, nil
}
return nil, nil
}