p2p: start p2p networking and DHT ops when starting services, not when instantiating them

agreement/fuzzer/networkFacade_test.go

@@ -247,7 +247,7 @@ func (n *NetworkFacade) PushDownstreamMessage(newMsg context.CancelFunc) bool {
 func (n *NetworkFacade) Address() (string, bool) { return "mock network", true }
 
 // Start - unused function
-func (n *NetworkFacade) Start() {}
+func (n *NetworkFacade) Start() error { return nil }
 
 // Stop - unused function
 func (n *NetworkFacade) Stop() {}

agreement/gossip/network_test.go

@@ -160,7 +160,7 @@ func (w *whiteholeNetwork) GetHTTPRequestConnection(request *http.Request) (conn
 	return nil
 }
 
-func (w *whiteholeNetwork) Start() {
+func (w *whiteholeNetwork) Start() error {
 	w.quit = make(chan struct{})
 	go func(w *whiteholeNetwork) {
 		w.domain.messagesMu.Lock()
@@ -216,7 +216,7 @@ func (w *whiteholeNetwork) Start() {
 			atomic.AddUint32(&w.lastMsgRead, 1)
 		}
 	}(w)
-	return
+	return nil
 }
 func (w *whiteholeNetwork) getMux() *network.Multiplexer {
 	return w.mux

components/mocks/mockNetwork.go

@@ -47,7 +47,8 @@ func (network *MockNetwork) Address() (string, bool) {
 }
 
 // Start - unused function
-func (network *MockNetwork) Start() {
+func (network *MockNetwork) Start() error {
+	return nil
 }
 
 // Stop - unused function

daemon/algod/server.go

@@ -56,7 +56,7 @@
 type ServerNode interface {
 	apiServer.APINodeInterface
 	ListeningAddress() (string, bool)
-	Start()
+	Start() error
 	Stop()
 }
 
@@ -272,7 +272,13 @@
 func (s *Server) Start() {
 	s.log.Info("Trying to start an Algorand node")
 	fmt.Print("Initializing the Algorand node... ")
-	s.node.Start()
+	err := s.node.Start()
+	if err != nil {
+		msg := fmt.Sprintf(("Failed to start alg Algorand node: %v"), err)
+		s.log.Error(msg)
+		fmt.Println(msg)
+		os.Exit(1)
+	}
 	s.log.Info("Successfully started an Algorand node.")
 	fmt.Println("Success!")
 
@@ -291,7 +297,6 @@
 	}
 
 	var apiToken string
-	var err error
 	fmt.Printf("API authentication disabled: %v\n", cfg.DisableAPIAuth)
 	if !cfg.DisableAPIAuth {
 		apiToken, err = tokens.GetAndValidateAPIToken(s.RootPath, tokens.AlgodTokenFilename)

network/gossipNode.go

@@ -72,7 +72,7 @@ type GossipNode interface {
 	GetPeers(options ...PeerOption) []Peer
 
 	// Start threads, listen on sockets.
-	Start()
+	Start() error
 
 	// Close sockets. Stop threads.
 	Stop()

network/hybridNetwork.go

@@ -42,7 +42,7 @@
 	// supply alternate NetAddress for P2P network
 	p2pcfg := cfg
 	p2pcfg.NetAddress = cfg.P2PListenAddress
-	p2pnet, err := NewP2PNetwork(log, p2pcfg, datadir, phonebookAddresses, genesisID, networkID)
+	p2pnet, err := NewP2PNetwork(log, p2pcfg, datadir, phonebookAddresses, genesisID, networkID, nodeInfo)
 	if err != nil {
 		return nil, err
 	}
@@ -153,18 +153,17 @@
 }
 
 // Start implements GossipNode
-func (n *HybridP2PNetwork) Start() {
-	_ = n.runParallel(func(net GossipNode) error {
-		net.Start()
-		return nil
+func (n *HybridP2PNetwork) Start() error {
+	err := n.runParallel(func(net GossipNode) error {
+		return net.Start()
 	})
+	return err
 }
 
 // Stop implements GossipNode
 func (n *HybridP2PNetwork) Stop() {
 	_ = n.runParallel(func(net GossipNode) error {
-		net.Start()
-		return nil
+		return net.Start()
 	})
 }
 

network/p2p/capabilities.go

@@ -30,7 +30,7 @@
 	"github.com/algorand/go-algorand/config"
 	"github.com/algorand/go-algorand/logging"
 	algoDht "github.com/algorand/go-algorand/network/p2p/dht"
-	"github.com/algorand/go-algorand/network/p2p/peerstore"
+	"github.com/algorand/go-algorand/protocol"
 )
 
 // Capability represents functions that some nodes may provide and other nodes would want to know about
@@ -88,7 +88,9 @@
 	ctx, cancel := context.WithTimeout(context.Background(), operationTimeout)
 	defer cancel()
 	var peers []peer.AddrInfo
-	peersChan, err := c.FindPeers(ctx, string(capability), discovery.Limit(n))
+	// +1 because it can include self but we exclude self from the returned list
+	// that might confuse the caller (and tests assertions)
+	peersChan, err := c.FindPeers(ctx, string(capability), discovery.Limit(n+1))
 	if err != nil {
 		return nil, err
 	}
@@ -146,17 +148,19 @@
 	}()
 }
 
+// Sizer exposes the Size method
+type Sizer interface {
+	Size() int
+}
+
+// RoutingTable exposes some knowledge about the DHT routing table
+func (c *CapabilitiesDiscovery) RoutingTable() Sizer {
+	return c.dht.RoutingTable()
+}
+
 // MakeCapabilitiesDiscovery creates a new CapabilitiesDiscovery object which exposes peer discovery and capabilities advertisement
-func MakeCapabilitiesDiscovery(ctx context.Context, cfg config.Local, datadir string, network string, log logging.Logger, bootstrapPeers []*peer.AddrInfo) (*CapabilitiesDiscovery, error) {
-	pstore, err := peerstore.NewPeerStore(bootstrapPeers)
-	if err != nil {
-		return nil, err
-	}
-	h, err := makeHost(cfg, datadir, pstore)
-	if err != nil {
-		return nil, err
-	}
-	discDht, err := algoDht.MakeDHT(ctx, h, network, cfg, bootstrapPeers)
+func MakeCapabilitiesDiscovery(ctx context.Context, cfg config.Local, h host.Host, networkID protocol.NetworkID, log logging.Logger, bootstrapFunc func() []peer.AddrInfo) (*CapabilitiesDiscovery, error) {
+	discDht, err := algoDht.MakeDHT(ctx, h, networkID, cfg, bootstrapFunc)
 	if err != nil {
 		return nil, err
 	}

network/p2p/capabilities_test.go

@@ -47,7 +47,11 @@ func TestCapabilities_Discovery(t *testing.T) {
 	testSize := 3
 	for i := 0; i < testSize; i++ {
 		tempdir := t.TempDir()
-		capD, err := MakeCapabilitiesDiscovery(context.Background(), config.GetDefaultLocal(), tempdir, "devtestnet", logging.Base(), []*peer.AddrInfo{})
+		ps, err := peerstore.NewPeerStore(nil)
+		require.NoError(t, err)
+		h, _, err := MakeHost(config.GetDefaultLocal(), tempdir, ps)
+		require.NoError(t, err)
+		capD, err := MakeCapabilitiesDiscovery(context.Background(), config.GetDefaultLocal(), h, "devtestnet", logging.Base(), func() []peer.AddrInfo { return nil })
 		require.NoError(t, err)
 		caps = append(caps, capD)
 		addrs = append(addrs, peer.AddrInfo{
@@ -72,7 +76,7 @@ func TestCapabilities_Discovery(t *testing.T) {
 
 func setupDHTHosts(t *testing.T, numHosts int) []*dht.IpfsDHT {
 	var hosts []host.Host
-	var bootstrapPeers []*peer.AddrInfo
+	var bootstrapPeers []peer.AddrInfo
 	var dhts []*dht.IpfsDHT
 	cfg := config.GetDefaultLocal()
 	for i := 0; i < numHosts; i++ {
@@ -87,10 +91,10 @@ func setupDHTHosts(t *testing.T, numHosts int) []*dht.IpfsDHT {
 			libp2p.Peerstore(ps))
 		require.NoError(t, err)
 		hosts = append(hosts, h)
-		bootstrapPeers = append(bootstrapPeers, &peer.AddrInfo{ID: h.ID(), Addrs: h.Addrs()})
+		bootstrapPeers = append(bootstrapPeers, peer.AddrInfo{ID: h.ID(), Addrs: h.Addrs()})
 	}
 	for _, h := range hosts {
-		ht, err := algodht.MakeDHT(context.Background(), h, "devtestnet", cfg, bootstrapPeers)
+		ht, err := algodht.MakeDHT(context.Background(), h, "devtestnet", cfg, func() []peer.AddrInfo { return bootstrapPeers })
 		require.NoError(t, err)
 		err = ht.Bootstrap(context.Background())
 		require.NoError(t, err)
@@ -117,7 +121,7 @@ func waitForRouting(t *testing.T, disc *CapabilitiesDiscovery) {
 
 func setupCapDiscovery(t *testing.T, numHosts int, numBootstrapPeers int) []*CapabilitiesDiscovery {
 	var hosts []host.Host
-	var bootstrapPeers []*peer.AddrInfo
+	var bootstrapPeers []peer.AddrInfo
 	var capsDisc []*CapabilitiesDiscovery
 	cfg := config.GetDefaultLocal()
 	for i := 0; i < numHosts; i++ {
@@ -132,17 +136,19 @@ func setupCapDiscovery(t *testing.T, numHosts int, numBootstrapPeers int) []*Cap
 			libp2p.Peerstore(ps))
 		require.NoError(t, err)
 		hosts = append(hosts, h)
-		bootstrapPeers = append(bootstrapPeers, &peer.AddrInfo{ID: h.ID(), Addrs: h.Addrs()})
+		bootstrapPeers = append(bootstrapPeers, peer.AddrInfo{ID: h.ID(), Addrs: h.Addrs()})
 	}
 	for _, h := range hosts {
 		bp := bootstrapPeers
 		if numBootstrapPeers != 0 && numBootstrapPeers != numHosts {
+			bp = make([]peer.AddrInfo, len(bootstrapPeers))
+			copy(bp, bootstrapPeers)
 			rand.Shuffle(len(bootstrapPeers), func(i, j int) {
 				bp[i], bp[j] = bp[j], bp[i]
 			})
 			bp = bp[:numBootstrapPeers]
 		}
-		ht, err := algodht.MakeDHT(context.Background(), h, "devtestnet", cfg, bp)
+		ht, err := algodht.MakeDHT(context.Background(), h, "devtestnet", cfg, func() []peer.AddrInfo { return bp })
 		require.NoError(t, err)
 		disc, err := algodht.MakeDiscovery(ht)
 		require.NoError(t, err)
@@ -304,7 +310,7 @@ func TestCapabilities_ExcludesSelf(t *testing.T) {
 	disc := setupCapDiscovery(t, 2, 2)
 
 	testPeersFound := func(disc *CapabilitiesDiscovery, n int, cap Capability) bool {
-		peers, err := disc.PeersForCapability(cap, n+1)
+		peers, err := disc.PeersForCapability(cap, n)
 		if err == nil && len(peers) == n {
 			return true
 		}

network/p2p/dht/dht.go

@@ -32,62 +32,26 @@ import (
 	"github.com/libp2p/go-libp2p/p2p/discovery/routing"
 
 	"github.com/algorand/go-algorand/config"
-	"github.com/algorand/go-algorand/network/p2p/dnsaddr"
 	algoproto "github.com/algorand/go-algorand/protocol"
 )
 
 const minBackoff = time.Second * 5
 const maxBackoff = time.Second * 20
 const baseBackoff = float64(1.1)
 
-// getBootstrapPeersFunc looks up a list of Multiaddrs strings from the dnsaddr records at the primary
-// SRV record domain.
-func getBootstrapPeersFunc(cfg config.Local, network string) func() []peer.AddrInfo {
-	return func() []peer.AddrInfo {
-		var addrs []peer.AddrInfo
-		bootstraps := cfg.DNSBootstrapArray(algoproto.NetworkID(network))
-		for _, dnsBootstrap := range bootstraps {
-			controller := dnsaddr.NewMultiaddrDNSResolveController(cfg.DNSSecuritySRVEnforced(), "")
-			resolvedAddrs, err := dnsaddr.MultiaddrsFromResolver(dnsBootstrap.PrimarySRVBootstrap, controller)
-			if err != nil {
-				continue
-			}
-			for _, resolvedAddr := range resolvedAddrs {
-				info, err0 := peer.AddrInfoFromP2pAddr(resolvedAddr)
-				if err0 != nil {
-					continue
-				}
-				addrs = append(addrs, *info)
-			}
-		}
-		return addrs
-	}
-}
-
-func dhtProtocolPrefix(network string) protocol.ID {
-	return protocol.ID(fmt.Sprintf("/algorand/kad/%s", network))
+func dhtProtocolPrefix(networkID algoproto.NetworkID) protocol.ID {
+	return protocol.ID(fmt.Sprintf("/algorand/kad/%s", networkID))
 }
 
 // MakeDHT creates the dht.IpfsDHT object
-func MakeDHT(ctx context.Context, h host.Host, network string, cfg config.Local, bootstrapPeers []*peer.AddrInfo) (*dht.IpfsDHT, error) {
+func MakeDHT(ctx context.Context, h host.Host, networkID algoproto.NetworkID, cfg config.Local, bootstrapFunc func() []peer.AddrInfo) (*dht.IpfsDHT, error) {
 	dhtCfg := []dht.Option{
 		// Automatically determine server or client mode
 		dht.Mode(dht.ModeAutoServer),
 		// We don't need the value store right now
 		dht.DisableValues(),
-		dht.ProtocolPrefix(dhtProtocolPrefix(network)),
-	}
-	if len(bootstrapPeers) > 0 {
-		var peers []peer.AddrInfo
-		for _, bPeer := range bootstrapPeers {
-			if bPeer != nil {
-				peers = append(peers, *bPeer)
-			}
-		}
-		dhtCfg = append(dhtCfg, dht.BootstrapPeers(peers...))
-
-	} else {
-		dhtCfg = append(dhtCfg, dht.BootstrapPeersFunc(getBootstrapPeersFunc(cfg, network)))
+		dht.ProtocolPrefix(dhtProtocolPrefix(networkID)),
+		dht.BootstrapPeersFunc(bootstrapFunc),
 	}
 	return dht.New(ctx, h, dhtCfg...)
 }

network/p2p/dht/dht_test.go

@@ -39,7 +39,7 @@ func TestDHTBasic(t *testing.T) {
 		h,
 		"devtestnet",
 		config.GetDefaultLocal(),
-		[]*peer.AddrInfo{{}})
+		func() []peer.AddrInfo { return nil })
 	require.NoError(t, err)
 	_, err = MakeDiscovery(dht)
 	require.NoError(t, err)
@@ -55,52 +55,10 @@ func TestDHTBasicAlgodev(t *testing.T) {
 	require.NoError(t, err)
 	cfg := config.GetDefaultLocal()
 	cfg.DNSBootstrapID = "<network>.algodev.network"
-	dht, err := MakeDHT(context.Background(), h, "betanet", cfg, []*peer.AddrInfo{})
+	dht, err := MakeDHT(context.Background(), h, "betanet", cfg, func() []peer.AddrInfo { return nil })
 	require.NoError(t, err)
 	_, err = MakeDiscovery(dht)
 	require.NoError(t, err)
 	err = dht.Bootstrap(context.Background())
 	require.NoError(t, err)
 }
-
-func TestGetBootstrapPeers(t *testing.T) {
-	t.Parallel()
-	partitiontest.PartitionTest(t)
-
-	cfg := config.GetDefaultLocal()
-	cfg.DNSBootstrapID = "<network>.algodev.network"
-	cfg.DNSSecurityFlags = 0
-
-	addrs := getBootstrapPeersFunc(cfg, "test")()
-
-	require.GreaterOrEqual(t, len(addrs), 1)
-	addr := addrs[0]
-	require.Equal(t, len(addr.Addrs), 1)
-	require.GreaterOrEqual(t, len(addr.Addrs), 1)
-}
-
-func TestGetBootstrapPeersFailure(t *testing.T) {
-	t.Parallel()
-	partitiontest.PartitionTest(t)
-
-	cfg := config.GetDefaultLocal()
-	cfg.DNSSecurityFlags = 0
-	cfg.DNSBootstrapID = "non-existent.algodev.network"
-
-	addrs := getBootstrapPeersFunc(cfg, "test")()
-
-	require.Equal(t, 0, len(addrs))
-}
-
-func TestGetBootstrapPeersInvalidAddr(t *testing.T) {
-	t.Parallel()
-	partitiontest.PartitionTest(t)
-
-	cfg := config.GetDefaultLocal()
-	cfg.DNSSecurityFlags = 0
-	cfg.DNSBootstrapID = "<network>.algodev.network"
-
-	addrs := getBootstrapPeersFunc(cfg, "testInvalidAddr")()
-
-	require.Equal(t, 0, len(addrs))
-}