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June 28, 2021 10:37
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libp2p minimal pubsub
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| package main | |
| import ( | |
| "context" | |
| "errors" | |
| "log" | |
| "os" | |
| "os/signal" | |
| "sync" | |
| "syscall" | |
| "time" | |
| "github.com/libp2p/go-libp2p" | |
| connmgr "github.com/libp2p/go-libp2p-connmgr" | |
| "github.com/libp2p/go-libp2p-core/crypto" | |
| "github.com/libp2p/go-libp2p-core/host" | |
| "github.com/libp2p/go-libp2p-core/peer" | |
| "github.com/libp2p/go-libp2p-core/routing" | |
| discovery "github.com/libp2p/go-libp2p-discovery" | |
| dht "github.com/libp2p/go-libp2p-kad-dht" | |
| pubsub "github.com/libp2p/go-libp2p-pubsub" | |
| libp2pquic "github.com/libp2p/go-libp2p-quic-transport" | |
| ) | |
| const RendezvousString = "2d2yzgRJGsOVggRw" | |
| func main() { | |
| log.SetFlags(log.LstdFlags | log.Lshortfile) | |
| ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) | |
| defer stop() | |
| // Generate key pair for identity | |
| priv, _, err := crypto.GenerateKeyPair(crypto.Ed25519, -1) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| bootstrapPeerAddrs := dht.GetDefaultBootstrapPeerAddrInfos() | |
| var dhtIpfs *dht.IpfsDHT | |
| h, err := libp2p.New(ctx, | |
| libp2p.DefaultListenAddrs, | |
| libp2p.DefaultTransports, | |
| libp2p.DefaultMuxers, | |
| libp2p.DefaultSecurity, | |
| libp2p.DefaultPeerstore, | |
| libp2p.DefaultEnableRelay, | |
| libp2p.Identity(priv), | |
| libp2p.ListenAddrStrings( | |
| "/ip4/0.0.0.0/udp/0/quic", | |
| "/ip6/::/udp/0/quic", | |
| ), | |
| libp2p.Transport(libp2pquic.NewTransport), | |
| libp2p.DefaultStaticRelays(), | |
| libp2p.EnableAutoRelay(), | |
| libp2p.EnableNATService(), | |
| libp2p.NATPortMap(), | |
| libp2p.ConnectionManager(connmgr.NewConnManager(20, 40, time.Minute)), | |
| libp2p.Routing(func(h host.Host) (routing.PeerRouting, error) { | |
| var err error | |
| dhtIpfs, err = dht.New(ctx, h, | |
| dht.Mode(dht.ModeServer), | |
| dht.BootstrapPeers(bootstrapPeerAddrs...)) | |
| return dhtIpfs, err | |
| })) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| defer h.Close() | |
| log.Println("Host ID:", h.ID()) | |
| log.Println("ListenAddresses:", h.Network().ListenAddresses()) | |
| err = dhtIpfs.Bootstrap(ctx) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| var wg sync.WaitGroup | |
| for _, peerAddr := range bootstrapPeerAddrs { | |
| wg.Add(1) | |
| go func(peerAddr peer.AddrInfo) { | |
| defer wg.Done() | |
| err := h.Connect(ctx, peerAddr) | |
| if err != nil { | |
| log.Println("Bootstrap connect error:", err, peerAddr) | |
| } else { | |
| log.Println("Bootstrap connect:", peerAddr) | |
| } | |
| }(peerAddr) | |
| } | |
| wg.Wait() | |
| routingDiscovery := discovery.NewRoutingDiscovery(dhtIpfs) | |
| ps, err := pubsub.NewGossipSub(ctx, h, pubsub.WithDiscovery(routingDiscovery)) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| log.Println("Advertising and finding peers...") | |
| wg.Add(1) | |
| go func() { | |
| defer wg.Done() | |
| for ctx.Err() == nil { | |
| _, err := routingDiscovery.Advertise(ctx, RendezvousString) | |
| if err != nil { | |
| if !errors.Is(err, context.DeadlineExceeded) { | |
| log.Println(err) | |
| return | |
| } else { | |
| log.Println("Advertise failed retrying...") | |
| } | |
| } else { | |
| break | |
| } | |
| } | |
| // see limit option | |
| peerAddrsChan, err := routingDiscovery.FindPeers(ctx, RendezvousString) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| for { | |
| select { | |
| case peerAddr := <-peerAddrsChan: | |
| // most the peers are empty! | |
| if (len(peerAddr.Addrs) == 0 && peerAddr.ID == "") || peerAddr.ID == h.ID() { | |
| continue | |
| } | |
| err := h.Connect(ctx, peerAddr) | |
| if err != nil { | |
| log.Println("Routing connect error:", err, peerAddr) | |
| } else { | |
| log.Println("Routing connect:", peerAddr) | |
| } | |
| case <-ctx.Done(): | |
| return | |
| } | |
| } | |
| }() | |
| defer wg.Wait() | |
| topic, err := ps.Join(RendezvousString) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| defer topic.Close() | |
| for ctx.Err() == nil { | |
| log.Println("Sending message...") | |
| // err = topic.Publish(ctx, []byte("hello world"), | |
| // pubsub.WithReadiness(func(rt pubsub.PubSubRouter, topic string) (bool, error) { | |
| // return rt.EnoughPeers(topic, 1), nil | |
| // })) | |
| err = topic.Publish(ctx, []byte("hello world")) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| select { | |
| case <-time.After(2 * time.Second): | |
| case <-ctx.Done(): | |
| return | |
| } | |
| } | |
| } |
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| package main | |
| import ( | |
| "context" | |
| "errors" | |
| "log" | |
| "os" | |
| "os/signal" | |
| "sync" | |
| "syscall" | |
| "time" | |
| "github.com/libp2p/go-libp2p" | |
| connmgr "github.com/libp2p/go-libp2p-connmgr" | |
| "github.com/libp2p/go-libp2p-core/crypto" | |
| "github.com/libp2p/go-libp2p-core/host" | |
| "github.com/libp2p/go-libp2p-core/peer" | |
| "github.com/libp2p/go-libp2p-core/routing" | |
| discovery "github.com/libp2p/go-libp2p-discovery" | |
| dht "github.com/libp2p/go-libp2p-kad-dht" | |
| pubsub "github.com/libp2p/go-libp2p-pubsub" | |
| libp2pquic "github.com/libp2p/go-libp2p-quic-transport" | |
| ) | |
| const RendezvousString = "2d2yzgRJGsOVggRw" | |
| func main() { | |
| log.SetFlags(log.LstdFlags | log.Lshortfile) | |
| ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) | |
| defer stop() | |
| // Generate key pair for identity | |
| priv, _, err := crypto.GenerateKeyPair(crypto.Ed25519, -1) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| bootstrapPeerAddrs := dht.GetDefaultBootstrapPeerAddrInfos() | |
| var dhtIpfs *dht.IpfsDHT | |
| h, err := libp2p.New(ctx, | |
| libp2p.DefaultListenAddrs, | |
| libp2p.DefaultTransports, | |
| libp2p.DefaultMuxers, | |
| libp2p.DefaultSecurity, | |
| libp2p.DefaultPeerstore, | |
| libp2p.DefaultEnableRelay, | |
| libp2p.Identity(priv), | |
| libp2p.ListenAddrStrings( | |
| "/ip4/0.0.0.0/udp/0/quic", | |
| "/ip6/::/udp/0/quic", | |
| ), | |
| libp2p.Transport(libp2pquic.NewTransport), | |
| libp2p.DefaultStaticRelays(), | |
| libp2p.EnableAutoRelay(), | |
| libp2p.EnableNATService(), | |
| libp2p.NATPortMap(), | |
| libp2p.ConnectionManager(connmgr.NewConnManager(20, 40, time.Minute)), | |
| libp2p.Routing(func(h host.Host) (routing.PeerRouting, error) { | |
| var err error | |
| dhtIpfs, err = dht.New(ctx, h, | |
| dht.Mode(dht.ModeServer), | |
| dht.BootstrapPeers(bootstrapPeerAddrs...)) | |
| return dhtIpfs, err | |
| })) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| defer h.Close() | |
| log.Println("Host ID:", h.ID()) | |
| log.Println("ListenAddresses:", h.Network().ListenAddresses()) | |
| err = dhtIpfs.Bootstrap(ctx) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| var wg sync.WaitGroup | |
| for _, peerAddr := range bootstrapPeerAddrs { | |
| wg.Add(1) | |
| go func(peerAddr peer.AddrInfo) { | |
| defer wg.Done() | |
| err := h.Connect(ctx, peerAddr) | |
| if err != nil { | |
| log.Println("Bootstrap connect error:", err, peerAddr) | |
| } else { | |
| log.Println("Bootstrap connect:", peerAddr) | |
| } | |
| }(peerAddr) | |
| } | |
| wg.Wait() | |
| routingDiscovery := discovery.NewRoutingDiscovery(dhtIpfs) | |
| ps, err := pubsub.NewGossipSub(ctx, h, pubsub.WithDiscovery(routingDiscovery)) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| log.Println("Advertising and finding peers...") | |
| wg.Add(1) | |
| go func() { | |
| defer wg.Done() | |
| for ctx.Err() == nil { | |
| _, err := routingDiscovery.Advertise(ctx, RendezvousString) | |
| if err != nil { | |
| if !errors.Is(err, context.DeadlineExceeded) { | |
| log.Println(err) | |
| return | |
| } else { | |
| log.Println("Advertise failed retrying...") | |
| } | |
| } else { | |
| break | |
| } | |
| } | |
| // see limit option | |
| peerAddrsChan, err := routingDiscovery.FindPeers(ctx, RendezvousString) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| for { | |
| select { | |
| case peerAddr := <-peerAddrsChan: | |
| // most of the peers are empty! | |
| if (len(peerAddr.Addrs) == 0 && peerAddr.ID == "") || peerAddr.ID == h.ID() { | |
| continue | |
| } | |
| err := h.Connect(ctx, peerAddr) | |
| if err != nil { | |
| log.Println("Routing connect error:", err, peerAddr) | |
| } else { | |
| log.Println("Routing connect:", peerAddr) | |
| } | |
| case <-ctx.Done(): | |
| return | |
| } | |
| } | |
| }() | |
| defer wg.Wait() | |
| topic, err := ps.Join(RendezvousString) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| defer topic.Close() | |
| sub, err := topic.Subscribe() | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| defer sub.Cancel() | |
| log.Println("Listening on messages...") | |
| for ctx.Err() == nil { | |
| mess, err := sub.Next(ctx) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| if mess.GetFrom() == h.ID() { | |
| continue | |
| } | |
| log.Println("From:", mess.GetFrom()) | |
| log.Println("Data:", string(mess.GetData())) | |
| } | |
| } |
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