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125 lines
2.6 KiB
125 lines
2.6 KiB
package peer
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import (
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"sync/atomic"
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"net"
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)
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const (
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DEFAULT_PORT = 8001
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)
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/* Listener */
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type Listener interface {
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Connections() <-chan *Connection
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LocalAddress() *NetAddress
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Stop()
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}
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/* DefaultListener */
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type DefaultListener struct {
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listener net.Listener
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connections chan *Connection
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stopped uint32
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}
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const (
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DEFAULT_BUFFERED_CONNECTIONS = 10
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)
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func NewDefaultListener(protocol string, listenAddr string) Listener {
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listener, err := net.Listen(protocol, listenAddr)
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if err != nil { panic(err) }
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dl := &DefaultListener{
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listener: listener,
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connections: make(chan *Connection, DEFAULT_BUFFERED_CONNECTIONS),
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}
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go dl.listenHandler()
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return dl
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}
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func (l *DefaultListener) listenHandler() {
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for {
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conn, err := l.listener.Accept()
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if atomic.LoadUint32(&l.stopped) == 1 { return }
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// listener wasn't stopped,
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// yet we encountered an error.
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if err != nil { panic(err) }
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c := NewConnection(conn)
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l.connections <- c
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}
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// cleanup
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close(l.connections)
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for _ = range l.connections {
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// drain
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}
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}
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func (l *DefaultListener) Connections() <-chan *Connection {
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return l.connections
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}
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func (l *DefaultListener) LocalAddress() *NetAddress {
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return GetLocalAddress()
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}
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func (l *DefaultListener) Stop() {
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if atomic.CompareAndSwapUint32(&l.stopped, 0, 1) {
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l.listener.Close()
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}
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}
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/* local address helpers */
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func GetLocalAddress() *NetAddress {
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laddr := GetUPNPLocalAddress()
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if laddr != nil { return laddr }
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laddr = GetDefaultLocalAddress()
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if laddr != nil { return laddr }
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panic("Could not determine local address")
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}
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// UPNP external address discovery & port mapping
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// TODO: more flexible internal & external ports
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func GetUPNPLocalAddress() *NetAddress {
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nat, err := Discover()
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if err != nil { return nil }
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ext, err := nat.GetExternalAddress()
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if err != nil { return nil }
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_, err = nat.AddPortMapping("tcp", DEFAULT_PORT, DEFAULT_PORT, "tendermint", 0)
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if err != nil { return nil }
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return NewNetAddressIPPort(ext, DEFAULT_PORT)
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}
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// Naive local IPv4 interface address detection
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// TODO: use syscalls to get actual ourIP. http://pastebin.com/9exZG4rh
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func GetDefaultLocalAddress() *NetAddress {
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addrs, err := net.InterfaceAddrs()
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if err != nil { panic("Wtf") }
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for _, a := range addrs {
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ipnet, ok := a.(*net.IPNet)
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if !ok { continue }
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v4 := ipnet.IP.To4()
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if v4 == nil || v4[0] == 127 { continue } // loopback
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return NewNetAddress(a)
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}
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return nil
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}
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