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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package yggconn
import (
"context"
"net"
"strings"
"time"
"github.com/libp2p/go-yamux"
)
func (n *Node) yamuxConfig() *yamux.Config {
cfg := yamux.DefaultConfig()
cfg.EnableKeepAlive = false
cfg.ConnectionWriteTimeout = time.Second * 15
cfg.MaxMessageSize = 65535
cfg.ReadBufSize = 655350
return cfg
}
func (n *Node) listenFromYgg() {
for {
conn, err := n.listener.Accept()
if err != nil {
n.log.Println("n.listener.Accept:", err)
return
}
var session *yamux.Session
// If the remote address is lower than ours then we'll be the
// server. Otherwse we'll be the client.
if strings.Compare(conn.RemoteAddr().String(), n.DerivedSessionName()) < 0 {
session, err = yamux.Server(conn, n.yamuxConfig())
} else {
session, err = yamux.Client(conn, n.yamuxConfig())
}
if err != nil {
return
}
go n.listenFromYggConn(session)
}
}
func (n *Node) listenFromYggConn(session *yamux.Session) {
n.sessions.Store(session.RemoteAddr().String(), session)
defer n.sessions.Delete(session.RemoteAddr())
defer func() {
if err := session.Close(); err != nil {
n.log.Println("session.Close:", err)
}
}()
for {
st, err := session.AcceptStream()
if err != nil {
n.log.Println("session.AcceptStream:", err)
return
}
n.incoming <- st
}
}
// Implements net.Listener
func (n *Node) Accept() (net.Conn, error) {
return <-n.incoming, nil
}
// Implements net.Listener
func (n *Node) Close() error {
return n.listener.Close()
}
// Implements net.Listener
func (n *Node) Addr() net.Addr {
return n.listener.Addr()
}
// Implements http.Transport.Dial
func (n *Node) Dial(network, address string) (net.Conn, error) {
return n.DialContext(context.TODO(), network, address)
}
// Implements http.Transport.DialContext
func (n *Node) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
s, ok1 := n.sessions.Load(address)
session, ok2 := s.(*yamux.Session)
if !ok1 || !ok2 || (ok1 && ok2 && session.IsClosed()) {
conn, err := n.dialer.DialContext(ctx, network, address)
if err != nil {
n.log.Println("n.dialer.DialContext:", err)
return nil, err
}
// If the remote address is lower than ours then we will be the
// server. Otherwise we'll be the client.
if strings.Compare(conn.RemoteAddr().String(), n.DerivedSessionName()) < 0 {
session, err = yamux.Server(conn, n.yamuxConfig())
} else {
session, err = yamux.Client(conn, n.yamuxConfig())
}
if err != nil {
return nil, err
}
go n.listenFromYggConn(session)
}
st, err := session.OpenStream()
if err != nil {
n.log.Println("session.OpenStream:", err)
return nil, err
}
return st, nil
}
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