Exemplo n.º 1
0
// Listen for new connections on the given multiaddr
func (s *Swarm) setupListener(maddr ma.Multiaddr) error {

	// TODO rethink how this has to work. (jbenet)
	//
	// resolved, err := resolveUnspecifiedAddresses([]ma.Multiaddr{maddr})
	// if err != nil {
	// 	return err
	// }
	// for _, a := range resolved {
	// 	s.peers.AddAddr(s.local, a)
	// }

	sk := s.peers.PrivKey(s.local)
	if sk == nil {
		// may be fine for sk to be nil, just log a warning.
		log.Warning("Listener not given PrivateKey, so WILL NOT SECURE conns.")
	}
	log.Debugf("Swarm Listening at %s", maddr)
	list, err := conn.Listen(s.Context(), maddr, s.local, sk)
	if err != nil {
		return err
	}

	list.SetAddrFilters(s.Filters)

	if cw, ok := list.(conn.ListenerConnWrapper); ok {
		cw.SetConnWrapper(func(c manet.Conn) manet.Conn {
			return mconn.WrapConn(s.bwc, c)
		})
	}

	// AddListener to the peerstream Listener. this will begin accepting connections
	// and streams!
	sl, err := s.swarm.AddListener(list)
	if err != nil {
		return err
	}
	log.Debugf("Swarm Listeners at %s", s.ListenAddresses())

	// signal to our notifiees on successful conn.
	s.notifyAll(func(n inet.Notifiee) {
		n.Listen((*Network)(s), maddr)
	})

	// go consume peerstream's listen accept errors. note, these ARE errors.
	// they may be killing the listener, and if we get _any_ we should be
	// fixing this in our conn.Listener (to ignore them or handle them
	// differently.)
	go func(ctx context.Context, sl *ps.Listener) {

		// signal to our notifiees closing
		defer s.notifyAll(func(n inet.Notifiee) {
			n.ListenClose((*Network)(s), maddr)
		})

		for {
			select {
			case err, more := <-sl.AcceptErrors():
				if !more {
					return
				}
				log.Warningf("swarm listener accept error: %s", err)
			case <-ctx.Done():
				return
			}
		}
	}(s.Context(), sl)

	return nil
}
Exemplo n.º 2
0
// dial is the actual swarm's dial logic, gated by Dial.
func (s *Swarm) dial(ctx context.Context, p peer.ID) (*Conn, error) {
	var logdial = lgbl.Dial("swarm", s.LocalPeer(), p, nil, nil)
	if p == s.local {
		log.Event(ctx, "swarmDialDoDialSelf", logdial)
		return nil, ErrDialToSelf
	}
	defer log.EventBegin(ctx, "swarmDialDo", logdial).Done()
	logdial["dial"] = "failure" // start off with failure. set to "success" at the end.

	sk := s.peers.PrivKey(s.local)
	logdial["encrypted"] = (sk != nil) // log wether this will be an encrypted dial or not.
	if sk == nil {
		// fine for sk to be nil, just log.
		log.Debug("Dial not given PrivateKey, so WILL NOT SECURE conn.")
	}

	// get our own addrs. try dialing out from our listener addresses (reusing ports)
	// Note that using our peerstore's addresses here is incorrect, as that would
	// include observed addresses. TODO: make peerstore's address book smarter.
	localAddrs := s.ListenAddresses()
	if len(localAddrs) == 0 {
		log.Debug("Dialing out with no local addresses.")
	}

	// get remote peer addrs
	remoteAddrs := s.peers.Addrs(p)
	// make sure we can use the addresses.
	remoteAddrs = addrutil.FilterUsableAddrs(remoteAddrs)
	// drop out any addrs that would just dial ourselves. use ListenAddresses
	// as that is a more authoritative view than localAddrs.
	ila, _ := s.InterfaceListenAddresses()
	remoteAddrs = addrutil.Subtract(remoteAddrs, ila)
	remoteAddrs = addrutil.Subtract(remoteAddrs, s.peers.Addrs(s.local))

	log.Debugf("%s swarm dialing %s -- local:%s remote:%s", s.local, p, s.ListenAddresses(), remoteAddrs)
	if len(remoteAddrs) == 0 {
		err := errors.New("peer has no addresses")
		logdial["error"] = err
		return nil, err
	}

	remoteAddrs = s.filterAddrs(remoteAddrs)
	if len(remoteAddrs) == 0 {
		err := errors.New("all adresses for peer have been filtered out")
		logdial["error"] = err
		return nil, err
	}

	// open connection to peer
	d := &conn.Dialer{
		Dialer: manet.Dialer{
			Dialer: net.Dialer{
				Timeout: s.dialT,
			},
		},
		LocalPeer:  s.local,
		LocalAddrs: localAddrs,
		PrivateKey: sk,
		Wrapper: func(c manet.Conn) manet.Conn {
			return mconn.WrapConn(s.bwc, c)
		},
	}

	// try to get a connection to any addr
	connC, err := s.dialAddrs(ctx, d, p, remoteAddrs)
	if err != nil {
		logdial["error"] = err
		return nil, err
	}
	logdial["netconn"] = lgbl.NetConn(connC)

	// ok try to setup the new connection.
	defer log.EventBegin(ctx, "swarmDialDoSetup", logdial, lgbl.NetConn(connC)).Done()
	swarmC, err := dialConnSetup(ctx, s, connC)
	if err != nil {
		logdial["error"] = err
		connC.Close() // close the connection. didn't work out :(
		return nil, err
	}

	logdial["dial"] = "success"
	return swarmC, nil
}