| 1 | package p2p |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "time" |
| 6 | |
| 7 | tec "github.com/jbenet/go-temp-err-catcher" |
| 8 | net "github.com/libp2p/go-libp2p/core/network" |
| 9 | "github.com/libp2p/go-libp2p/core/peer" |
| 10 | "github.com/libp2p/go-libp2p/core/protocol" |
| 11 | ma "github.com/multiformats/go-multiaddr" |
| 12 | manet "github.com/multiformats/go-multiaddr/net" |
| 13 | ) |
| 14 | |
| 15 | // localListener manet streams and proxies them to libp2p services. |
| 16 | type localListener struct { |
| 17 | ctx context.Context |
| 18 | |
| 19 | p2p *P2P |
| 20 | |
| 21 | proto protocol.ID |
| 22 | laddr ma.Multiaddr |
| 23 | peer peer.ID |
| 24 | |
| 25 | listener manet.Listener |
| 26 | done chan struct{} |
| 27 | } |
| 28 | |
| 29 | // ForwardLocal creates new P2P stream to a remote listener. |
| 30 | func (p2p *P2P) ForwardLocal(ctx context.Context, peer peer.ID, proto protocol.ID, bindAddr ma.Multiaddr) (Listener, error) { |
| 31 | listener := &localListener{ |
| 32 | ctx: ctx, |
| 33 | p2p: p2p, |
| 34 | proto: proto, |
| 35 | peer: peer, |
| 36 | done: make(chan struct{}), |
| 37 | } |
| 38 | |
| 39 | maListener, err := manet.Listen(bindAddr) |
| 40 | if err != nil { |
| 41 | return nil, err |
| 42 | } |
| 43 | |
| 44 | listener.listener = maListener |
| 45 | listener.laddr = maListener.Multiaddr() |
| 46 | |
| 47 | if err := p2p.ListenersLocal.Register(listener); err != nil { |
| 48 | return nil, err |
| 49 | } |
| 50 | |
| 51 | go listener.acceptConns() |
| 52 | |
| 53 | return listener, nil |
| 54 | } |
| 55 | |
| 56 | func (l *localListener) dial(ctx context.Context) (net.Stream, error) { |
| 57 | cctx, cancel := context.WithTimeout(ctx, time.Second*30) // TODO: configurable? |
| 58 | defer cancel() |
| 59 | |
| 60 | return l.p2p.peerHost.NewStream(cctx, l.peer, l.proto) |
| 61 | } |
| 62 | |
| 63 | func (l *localListener) acceptConns() { |
| 64 | for { |
| 65 | local, err := l.listener.Accept() |
| 66 | if err != nil { |
| 67 | if tec.ErrIsTemporary(err) { |
| 68 | continue |
| 69 | } |
| 70 | return |
| 71 | } |
| 72 | |
| 73 | go l.setupStream(local) |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | func (l *localListener) setupStream(local manet.Conn) { |
| 78 | remote, err := l.dial(l.ctx) |
| 79 | if err != nil { |
| 80 | local.Close() |
| 81 | log.Warnf("failed to dial to remote %s/%s", l.peer, l.proto) |
| 82 | return |
| 83 | } |
| 84 | |
| 85 | stream := &Stream{ |
| 86 | Protocol: l.proto, |
| 87 | |
| 88 | OriginAddr: local.RemoteMultiaddr(), |
| 89 | TargetAddr: l.TargetAddress(), |
| 90 | peer: l.peer, |
| 91 | |
| 92 | Local: local, |
| 93 | Remote: remote, |
| 94 | |
| 95 | Registry: l.p2p.Streams, |
| 96 | } |
| 97 | |
| 98 | l.p2p.Streams.Register(stream) |
| 99 | } |
| 100 | |
| 101 | func (l *localListener) close() { |
| 102 | l.listener.Close() |
| 103 | close(l.done) |
| 104 | } |
| 105 | |
| 106 | func (l *localListener) Done() <-chan struct{} { |
| 107 | return l.done |
| 108 | } |
| 109 | |
| 110 | func (l *localListener) Protocol() protocol.ID { |
| 111 | return l.proto |
| 112 | } |
| 113 | |
| 114 | func (l *localListener) ListenAddress() ma.Multiaddr { |
| 115 | return l.laddr |
| 116 | } |
| 117 | |
| 118 | func (l *localListener) TargetAddress() ma.Multiaddr { |
| 119 | addr, err := ma.NewMultiaddr(maPrefix + l.peer.String()) |
| 120 | if err != nil { |
| 121 | panic(err) |
| 122 | } |
| 123 | return addr |
| 124 | } |
| 125 | |
| 126 | func (l *localListener) key() protocol.ID { |
| 127 | return protocol.ID(l.ListenAddress().String()) |
| 128 | } |