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tcp_hub.go
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tcp_hub.go
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package internet
import (
"net"
"sync"
"v2ray.com/core/common/errors"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/common/retry"
)
var (
transportListenerCache = make(map[TransportProtocol]ListenFunc)
)
func RegisterTransportListener(protocol TransportProtocol, listener ListenFunc) error {
if _, found := transportListenerCache[protocol]; found {
return errors.New("Internet|TCPHub: ", protocol, " listener already registered.")
}
transportListenerCache[protocol] = listener
return nil
}
type ListenFunc func(address v2net.Address, port v2net.Port, options ListenOptions) (Listener, error)
type ListenOptions struct {
Stream *StreamConfig
RecvOrigDest bool
}
type Listener interface {
Accept() (Connection, error)
Close() error
Addr() net.Addr
}
type TCPHub struct {
sync.Mutex
listener Listener
connCallback ConnectionHandler
accepting bool
}
func ListenTCP(address v2net.Address, port v2net.Port, callback ConnectionHandler, settings *StreamConfig) (*TCPHub, error) {
options := ListenOptions{
Stream: settings,
}
protocol := settings.GetEffectiveProtocol()
listenFunc := transportListenerCache[protocol]
if listenFunc == nil {
return nil, errors.New("Internet|TCPHub: ", protocol, " listener not registered.")
}
listener, err := listenFunc(address, port, options)
if err != nil {
return nil, errors.Base(err).Message("Internet|TCPHub: Failed to listen on address: ", address, ":", port)
}
hub := &TCPHub{
listener: listener,
connCallback: callback,
}
go hub.start()
return hub, nil
}
func (v *TCPHub) Close() {
v.accepting = false
v.listener.Close()
}
func (v *TCPHub) start() {
v.accepting = true
for v.accepting {
var newConn Connection
err := retry.ExponentialBackoff(10, 500).On(func() error {
if !v.accepting {
return nil
}
conn, err := v.listener.Accept()
if err != nil {
return errors.Base(err).Message("Internet|Listener: Failed to accept new TCP connection.")
}
newConn = conn
return nil
})
if err == nil && newConn != nil {
go v.connCallback(newConn)
}
}
}