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session.go
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session.go
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/*
* ORBIT - Interlink Remote Applications
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Roland Singer <roland.singer[at]desertbit.com>
* Copyright (c) 2020 Sebastian Borchers <sebastian[at]desertbit.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package yamux
import (
"context"
"errors"
"io"
"net"
"github.com/desertbit/closer/v3"
"github.com/desertbit/orbit/pkg/transport"
"github.com/desertbit/yamux"
)
var _ transport.Conn = &session{}
type session struct {
closer.Closer
conn net.Conn
ys *yamux.Session
}
func newSession(cl closer.Closer, conn net.Conn, isServer bool, conf *yamux.Config) (s *session, err error) {
s = &session{
Closer: cl,
conn: conn,
}
s.OnClosing(conn.Close)
// Always close on error.
defer func() {
if err != nil {
s.Close_()
}
}()
// Create a new yamux session.
if isServer {
s.ys, err = yamux.Server(conn, conf)
} else {
s.ys, err = yamux.Client(conn, conf)
}
if err != nil {
return
}
s.OnClosing(s.ys.Close)
// Always close if the yamux session closes.
go func() {
select {
case <-s.ClosingChan():
case <-s.ys.ClosedChan():
}
s.Close_()
}()
return s, nil
}
// LocalAddr returns the local address.
func (s *session) LocalAddr() net.Addr {
return s.conn.LocalAddr()
}
// RemoteAddr returns the address of the peer.
func (s *session) RemoteAddr() net.Addr {
return s.conn.RemoteAddr()
}
// AcceptStream returns the next stream opened by the peer, blocking until one is available.
func (s *session) AcceptStream(ctx context.Context) (transport.Stream, error) {
stream, err := s.ys.AcceptStreamWithContext(ctx)
if err != nil {
return nil, err
}
return newStream(stream), nil
}
// OpenStream opens a new bidirectional stream.
// There is no signaling to the peer about new streams:
// The peer can only accept the stream after data has been sent on the stream.
func (s *session) OpenStream(ctx context.Context) (transport.Stream, error) {
// TODO: Fork the yamux package and implement the context cancel handling.
stream, err := s.ys.OpenStream()
if err != nil {
return nil, err
}
return newStream(stream), nil
}
func (s *session) IsClosedError(err error) bool {
return errors.Is(err, io.EOF)
}