dendrite/cmd/dendrite-demo-yggdrasil/yggconn/session.go
Neil Alexander 464718c3e6
Yggdrasil-based P2P demo (#1108)
* Initial work on Yggdrasil demo

* Muxing?

* Yamux

* Updates to yamux

* Updates

* Comments

* Update to use monolith stuff

* Update go.mod/go.sum

* Set defaults

* Tweaks

* Update yggdrasil

* Update config

* MarshalIndent

* Change default instance name/port

* add -peer switch

* gocyclo, for a change

* Determinate yamux roles

* Fix copyright notices

* Remove HTTP API checks as always false, remove unused topic
2020-06-10 10:54:06 +01:00

116 lines
2.8 KiB
Go

// 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 = true
cfg.KeepAliveInterval = time.Second * 30
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 strings.Compare(n.EncryptionPublicKey(), conn.RemoteAddr().String()) < 0 {
session, err = yamux.Client(conn, n.yamuxConfig())
} else {
session, err = yamux.Server(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())
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 {
conn, err := n.dialer.DialContext(ctx, network, address)
if err != nil {
n.log.Println("n.dialer.DialContext:", err)
return nil, err
}
if strings.Compare(n.EncryptionPublicKey(), address) < 0 {
session, err = yamux.Client(conn, n.yamuxConfig())
} else {
session, err = yamux.Server(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
}