package main import ( "encoding/hex" "fmt" "io/ioutil" "net" "net/http" _ "net/http/pprof" "os" "path/filepath" "runtime" "strconv" "google.golang.org/grpc" "github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/lnrpc" "github.com/lightningnetwork/lnd/lnwallet" ) var ( cfg *config shutdownChannel = make(chan struct{}) ) // lndMain is the true entry point for lnd. This function is required since // defers created in the top-level scope of a main method aren't executed if // os.Exit() is called. func lndMain() error { // Load the configuration, and parse any command line options. This // function will also set up logging properly. loadedConfig, err := loadConfig() if err != nil { return err } cfg = loadedConfig defer backendLog.Flush() // Show version at startup. ltndLog.Infof("Version %s", version()) if loadedConfig.SPVMode == true { shell(loadedConfig.SPVHostAdr, activeNetParams.Params) return err } // Enable http profiling server if requested. if cfg.Profile != "" { go func() { listenAddr := net.JoinHostPort("", cfg.Profile) profileRedirect := http.RedirectHandler("/debug/pprof", http.StatusSeeOther) http.Handle("/", profileRedirect) fmt.Println(http.ListenAndServe(listenAddr, nil)) }() } // Open the channeldb, which is dedicated to storing channel, and // network related meta-data. chanDB, err := channeldb.Open(loadedConfig.DataDir, activeNetParams.Params) if err != nil { fmt.Println("unable to open channeldb: ", err) return err } defer chanDB.Close() // Next load btcd's TLS cert for the RPC connection. If a raw cert was // specified in the config, then we'll se that directly. Otherwise, we // attempt to read the cert from the path specified in the config. var rpcCert []byte if loadedConfig.RawRPCCert != "" { rpcCert, err = hex.DecodeString(loadedConfig.RawRPCCert) if err != nil { return err } } else { certFile, err := os.Open(loadedConfig.RPCCert) if err != nil { return err } rpcCert, err = ioutil.ReadAll(certFile) if err != nil { return err } if err := certFile.Close(); err != nil { return err } } rpcIP, err := net.LookupHost(loadedConfig.RPCHost) if err != nil { fmt.Printf("unable to resolve rpc host: %v", err) return err } // Create, and start the lnwallet, which handles the core payment channel // logic, and exposes control via proxy state machines. config := &lnwallet.Config{ PrivatePass: []byte("hello"), DataDir: filepath.Join(loadedConfig.DataDir, "lnwallet"), RpcHost: fmt.Sprintf("%v:%v", rpcIP[0], activeNetParams.rpcPort), RpcUser: loadedConfig.RPCUser, RpcPass: loadedConfig.RPCPass, CACert: rpcCert, NetParams: activeNetParams.Params, } wallet, err := lnwallet.NewLightningWallet(config, chanDB) if err != nil { fmt.Printf("unable to create wallet: %v\n", err) return err } if err := wallet.Startup(); err != nil { fmt.Printf("unable to start wallet: %v\n", err) return err } ltndLog.Info("LightningWallet opened") ec := &lnwallet.WaddrmgrEncryptorDecryptor{wallet.Manager} chanDB.RegisterCryptoSystem(ec) // Set up the core server which will listen for incoming peer // connections. defaultListenAddrs := []string{ net.JoinHostPort("", strconv.Itoa(loadedConfig.PeerPort)), } server, err := newServer(defaultListenAddrs, wallet, chanDB) if err != nil { srvrLog.Errorf("unable to create server: %v\n", err) return err } server.Start() addInterruptHandler(func() { ltndLog.Infof("Gracefully shutting down the server...") server.Stop() server.WaitForShutdown() }) // Initialize, and register our implementation of the gRPC server. var opts []grpc.ServerOption grpcServer := grpc.NewServer(opts...) lnrpc.RegisterLightningServer(grpcServer, server.rpcServer) // Finally, start the grpc server listening for HTTP/2 connections. lis, err := net.Listen("tcp", fmt.Sprintf(":%d", loadedConfig.RPCPort)) if err != nil { fmt.Printf("failed to listen: %v", err) return err } go func() { rpcsLog.Infof("RPC server listening on %s", lis.Addr()) grpcServer.Serve(lis) }() // Wait for shutdown signal from either a graceful server stop or from // the interrupt handler. <-shutdownChannel ltndLog.Info("Shutdown complete") return nil } func main() { // Use all processor cores. // TODO(roasbeef): remove this if required version # is > 1.6? runtime.GOMAXPROCS(runtime.NumCPU()) // Call the "real" main in a nested manner so the defers will properly // be executed in the case of a graceful shutdown. if err := lndMain(); err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(1) } }