106 lines
1.9 KiB
Go
106 lines
1.9 KiB
Go
package tunnel
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import (
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"io"
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)
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type tunListener struct {
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// address of the listener
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addr string
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// the accept channel
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accept chan *socket
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// the channel to close
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closed chan bool
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// the tunnel closed channel
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tunClosed chan bool
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// the connection
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conn Conn
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// the listener socket
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socket *socket
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}
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func (t *tunListener) process() {
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// our connection map for session
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conns := make(map[string]*socket)
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for {
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select {
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case <-t.closed:
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return
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// receive a new message
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case m := <-t.socket.recv:
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// get a socket
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sock, ok := conns[m.session]
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if !ok {
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// create a new socket session
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sock = &socket{
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// our tunnel id
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id: m.id,
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// the session id
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session: m.session,
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// close chan
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closed: make(chan bool),
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// recv called by the acceptor
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recv: make(chan *message, 128),
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// use the internal send buffer
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send: t.socket.send,
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// wait
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wait: make(chan bool),
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}
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// save the socket
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conns[m.session] = sock
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// send to accept chan
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select {
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case <-t.closed:
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return
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case t.accept <- sock:
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}
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}
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// send this to the accept chan
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select {
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case <-sock.closed:
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delete(conns, m.session)
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case sock.recv <- m:
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}
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}
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}
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}
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func (t *tunListener) Addr() string {
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return t.addr
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}
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// Close closes tunnel listener
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func (t *tunListener) Close() error {
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select {
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case <-t.closed:
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return nil
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default:
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close(t.closed)
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}
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return nil
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}
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// Everytime accept is called we essentially block till we get a new connection
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func (t *tunListener) Accept() (Conn, error) {
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select {
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// if the socket is closed return
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case <-t.closed:
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return nil, io.EOF
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case <-t.tunClosed:
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// close the listener when the tunnel closes
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close(t.closed)
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return nil, io.EOF
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// wait for a new connection
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case c, ok := <-t.accept:
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if !ok {
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return nil, io.EOF
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}
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return c, nil
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}
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return nil, nil
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}
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