micro/tunnel/listener.go

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2019-08-07 20:44:33 +03:00
package tunnel
import (
"io"
)
type tunListener struct {
// address of the listener
addr string
// the accept channel
accept chan *socket
// the channel to close
closed chan bool
// the connection
conn Conn
// the listener socket
socket *socket
}
func (t *tunListener) process() {
// our connection map for session
conns := make(map[string]*socket)
for {
select {
case <-t.closed:
return
// receive a new message
case m := <-t.socket.recv:
// get a socket
sock, ok := conns[m.session]
if !ok {
// create a new socket session
sock = &socket{
// our tunnel id
id: m.id,
// the session id
session: m.session,
// close chan
closed: make(chan bool),
// recv called by the acceptor
recv: make(chan *message, 128),
// use the internal send buffer
send: t.socket.send,
// wait
wait: make(chan bool),
}
// first message
sock.recv <- m
// save the socket
conns[m.session] = sock
// send to accept chan
select {
case <-t.closed:
return
case t.accept <- sock:
}
}
// send this to the accept chan
select {
case <-sock.closed:
delete(conns, m.session)
case sock.recv <- m:
}
}
}
}
func (t *tunListener) Addr() string {
return t.addr
}
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() (Conn, error) {
select {
// if the socket is closed return
case <-t.closed:
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
}