forked from libp2p/go-libp2p
/
listen.go
80 lines (68 loc) · 1.53 KB
/
listen.go
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package reuseport
import (
"net"
"github.com/libp2p/go-reuseport"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
)
type listener struct {
manet.Listener
network *network
}
func (l *listener) Close() error {
l.network.mu.Lock()
delete(l.network.listeners, l)
l.network.dialer = nil
l.network.mu.Unlock()
return l.Listener.Close()
}
// Listen listens on the given multiaddr.
//
// If reuseport is supported, it will be enabled for this listener and future
// dials from this transport may reuse the port.
//
// Note: You can listen on the same multiaddr as many times as you want
// (although only *one* listener will end up handling the inbound connection).
func (t *Transport) Listen(laddr ma.Multiaddr) (manet.Listener, error) {
nw, naddr, err := manet.DialArgs(laddr)
if err != nil {
return nil, err
}
var n *network
switch nw {
case "tcp4":
n = &t.v4
case "tcp6":
n = &t.v6
default:
return nil, ErrWrongProto
}
if !reuseport.Available() {
return manet.Listen(laddr)
}
nl, err := reuseport.Listen(nw, naddr)
if err != nil {
return manet.Listen(laddr)
}
if _, ok := nl.Addr().(*net.TCPAddr); !ok {
nl.Close()
return nil, ErrWrongProto
}
malist, err := manet.WrapNetListener(nl)
if err != nil {
nl.Close()
return nil, err
}
list := &listener{
Listener: malist,
network: n,
}
n.mu.Lock()
defer n.mu.Unlock()
if n.listeners == nil {
n.listeners = make(map[*listener]struct{})
}
n.listeners[list] = struct{}{}
n.dialer = nil
return list, nil
}