package server import ( "context" "errors" "fmt" "net/url" "os" "os/signal" "runtime" "syscall" "github.com/nspcc-dev/neo-go/cli/options" "github.com/nspcc-dev/neo-go/pkg/config" "github.com/nspcc-dev/neo-go/pkg/config/netmode" "github.com/nspcc-dev/neo-go/pkg/consensus" "github.com/nspcc-dev/neo-go/pkg/core" "github.com/nspcc-dev/neo-go/pkg/core/block" "github.com/nspcc-dev/neo-go/pkg/core/chaindump" corestate "github.com/nspcc-dev/neo-go/pkg/core/stateroot" "github.com/nspcc-dev/neo-go/pkg/core/storage" "github.com/nspcc-dev/neo-go/pkg/core/transaction" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/network" "github.com/nspcc-dev/neo-go/pkg/services/metrics" "github.com/nspcc-dev/neo-go/pkg/services/notary" "github.com/nspcc-dev/neo-go/pkg/services/oracle" "github.com/nspcc-dev/neo-go/pkg/services/rpcsrv" "github.com/nspcc-dev/neo-go/pkg/services/stateroot" "github.com/urfave/cli" "go.uber.org/zap" "go.uber.org/zap/zapcore" ) var ( // _winfileSinkRegistered denotes whether zap has registered // user-supplied factory for all sinks with `winfile`-prefixed scheme. _winfileSinkRegistered bool _winfileSinkCloser func() error ) // NewCommands returns 'node' command. func NewCommands() []cli.Command { var cfgFlags = []cli.Flag{ cli.StringFlag{Name: "config-path"}, cli.BoolFlag{Name: "debug, d"}, } cfgFlags = append(cfgFlags, options.Network...) var cfgWithCountFlags = make([]cli.Flag, len(cfgFlags)) copy(cfgWithCountFlags, cfgFlags) cfgWithCountFlags = append(cfgWithCountFlags, cli.UintFlag{ Name: "count, c", Usage: "number of blocks to be processed (default or 0: all chain)", }, ) var cfgCountOutFlags = make([]cli.Flag, len(cfgWithCountFlags)) copy(cfgCountOutFlags, cfgWithCountFlags) cfgCountOutFlags = append(cfgCountOutFlags, cli.UintFlag{ Name: "start, s", Usage: "block number to start from (default: 0)", }, cli.StringFlag{ Name: "out, o", Usage: "Output file (stdout if not given)", }, ) var cfgCountInFlags = make([]cli.Flag, len(cfgWithCountFlags)) copy(cfgCountInFlags, cfgWithCountFlags) cfgCountInFlags = append(cfgCountInFlags, cli.StringFlag{ Name: "in, i", Usage: "Input file (stdin if not given)", }, cli.StringFlag{ Name: "dump", Usage: "directory for storing JSON dumps", }, cli.BoolFlag{ Name: "incremental, n", Usage: "use if dump is incremental", }, ) return []cli.Command{ { Name: "node", Usage: "start a NEO node", Action: startServer, Flags: cfgFlags, }, { Name: "db", Usage: "database manipulations", Subcommands: []cli.Command{ { Name: "dump", Usage: "dump blocks (starting with block #1) to the file", Action: dumpDB, Flags: cfgCountOutFlags, }, { Name: "restore", Usage: "restore blocks from the file", Action: restoreDB, Flags: cfgCountInFlags, }, }, }, } } func newGraceContext() context.Context { ctx, cancel := context.WithCancel(context.Background()) stop := make(chan os.Signal, 1) signal.Notify(stop, os.Interrupt) go func() { <-stop cancel() }() return ctx } // getConfigFromContext looks at the path and the mode flags in the given config and // returns an appropriate config. func getConfigFromContext(ctx *cli.Context) (config.Config, error) { configPath := "./config" if argCp := ctx.String("config-path"); argCp != "" { configPath = argCp } return config.Load(configPath, options.GetNetwork(ctx)) } // handleLoggingParams reads logging parameters. // If a user selected debug level -- function enables it. // If logPath is configured -- function creates a dir and a file for logging. // If logPath is configured on Windows -- function returns closer to be // able to close sink for the opened log output file. func handleLoggingParams(ctx *cli.Context, cfg config.ApplicationConfiguration) (*zap.Logger, func() error, error) { level := zapcore.InfoLevel if ctx.Bool("debug") { level = zapcore.DebugLevel } cc := zap.NewProductionConfig() cc.DisableCaller = true cc.DisableStacktrace = true cc.EncoderConfig.EncodeDuration = zapcore.StringDurationEncoder cc.EncoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder cc.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder cc.Encoding = "console" cc.Level = zap.NewAtomicLevelAt(level) cc.Sampling = nil if logPath := cfg.LogPath; logPath != "" { if err := io.MakeDirForFile(logPath, "logger"); err != nil { return nil, nil, err } if runtime.GOOS == "windows" { if !_winfileSinkRegistered { // See https://github.com/uber-go/zap/issues/621. err := zap.RegisterSink("winfile", func(u *url.URL) (zap.Sink, error) { if u.User != nil { return nil, fmt.Errorf("user and password not allowed with file URLs: got %v", u) } if u.Fragment != "" { return nil, fmt.Errorf("fragments not allowed with file URLs: got %v", u) } if u.RawQuery != "" { return nil, fmt.Errorf("query parameters not allowed with file URLs: got %v", u) } // Error messages are better if we check hostname and port separately. if u.Port() != "" { return nil, fmt.Errorf("ports not allowed with file URLs: got %v", u) } if hn := u.Hostname(); hn != "" && hn != "localhost" { return nil, fmt.Errorf("file URLs must leave host empty or use localhost: got %v", u) } switch u.Path { case "stdout": return os.Stdout, nil case "stderr": return os.Stderr, nil } f, err := os.OpenFile(u.Path[1:], // Remove leading slash left after url.Parse. os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644) _winfileSinkCloser = func() error { _winfileSinkCloser = nil return f.Close() } return f, err }) if err != nil { return nil, nil, fmt.Errorf("failed to register windows-specific sinc: %w", err) } _winfileSinkRegistered = true } logPath = "winfile:///" + logPath } cc.OutputPaths = []string{logPath} } log, err := cc.Build() return log, _winfileSinkCloser, err } func initBCWithMetrics(cfg config.Config, log *zap.Logger) (*core.Blockchain, *metrics.Service, *metrics.Service, error) { chain, err := initBlockChain(cfg, log) if err != nil { return nil, nil, nil, cli.NewExitError(err, 1) } configureAddresses(&cfg.ApplicationConfiguration) prometheus := metrics.NewPrometheusService(cfg.ApplicationConfiguration.Prometheus, log) pprof := metrics.NewPprofService(cfg.ApplicationConfiguration.Pprof, log) go chain.Run() go prometheus.Start() go pprof.Start() return chain, prometheus, pprof, nil } func dumpDB(ctx *cli.Context) error { cfg, err := getConfigFromContext(ctx) if err != nil { return cli.NewExitError(err, 1) } log, logCloser, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration) if err != nil { return cli.NewExitError(err, 1) } if logCloser != nil { defer func() { _ = logCloser() }() } count := uint32(ctx.Uint("count")) start := uint32(ctx.Uint("start")) var outStream = os.Stdout if out := ctx.String("out"); out != "" { outStream, err = os.Create(out) if err != nil { return cli.NewExitError(err, 1) } } defer outStream.Close() writer := io.NewBinWriterFromIO(outStream) chain, prometheus, pprof, err := initBCWithMetrics(cfg, log) if err != nil { return err } defer func() { pprof.ShutDown() prometheus.ShutDown() chain.Close() }() chainCount := chain.BlockHeight() + 1 if start+count > chainCount { return cli.NewExitError(fmt.Errorf("chain is not that high (%d) to dump %d blocks starting from %d", chainCount-1, count, start), 1) } if count == 0 { count = chainCount - start } writer.WriteU32LE(count) err = chaindump.Dump(chain, writer, start, count) if err != nil { return cli.NewExitError(err.Error(), 1) } return nil } func restoreDB(ctx *cli.Context) error { cfg, err := getConfigFromContext(ctx) if err != nil { return err } log, logCloser, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration) if err != nil { return cli.NewExitError(err, 1) } if logCloser != nil { defer func() { _ = logCloser() }() } count := uint32(ctx.Uint("count")) var inStream = os.Stdin if in := ctx.String("in"); in != "" { inStream, err = os.Open(in) if err != nil { return cli.NewExitError(err, 1) } } defer inStream.Close() reader := io.NewBinReaderFromIO(inStream) dumpDir := ctx.String("dump") if dumpDir != "" { cfg.ProtocolConfiguration.SaveStorageBatch = true } chain, prometheus, pprof, err := initBCWithMetrics(cfg, log) if err != nil { return err } defer func() { pprof.ShutDown() prometheus.ShutDown() chain.Close() }() var start uint32 if ctx.Bool("incremental") { start = reader.ReadU32LE() if chain.BlockHeight()+1 < start { return cli.NewExitError(fmt.Errorf("expected height: %d, dump starts at %d", chain.BlockHeight()+1, start), 1) } } var skip uint32 if chain.BlockHeight() != 0 { skip = chain.BlockHeight() + 1 - start } var allBlocks = reader.ReadU32LE() if reader.Err != nil { return cli.NewExitError(err, 1) } if skip+count > allBlocks { return cli.NewExitError(fmt.Errorf("input file has only %d blocks, can't read %d starting from %d", allBlocks, count, skip), 1) } if count == 0 { count = allBlocks - skip } log.Info("initialize restore", zap.Uint32("start", start), zap.Uint32("height", chain.BlockHeight()), zap.Uint32("skip", skip), zap.Uint32("count", count)) gctx := newGraceContext() var lastIndex uint32 dump := newDump() defer func() { _ = dump.tryPersist(dumpDir, lastIndex) }() var f = func(b *block.Block) error { select { case <-gctx.Done(): return gctx.Err() default: return nil } } if dumpDir != "" { f = func(b *block.Block) error { select { case <-gctx.Done(): return gctx.Err() default: } batch := chain.LastBatch() // The genesis block may already be persisted, so LastBatch() will return nil. if batch == nil && b.Index == 0 { return nil } dump.add(b.Index, batch) lastIndex = b.Index if b.Index%1000 == 0 { if err := dump.tryPersist(dumpDir, b.Index); err != nil { return fmt.Errorf("can't dump storage to file: %w", err) } } return nil } } err = chaindump.Restore(chain, reader, skip, count, f) if err != nil { return cli.NewExitError(err, 1) } return nil } func mkOracle(config config.OracleConfiguration, magic netmode.Magic, chain *core.Blockchain, serv *network.Server, log *zap.Logger) (*oracle.Oracle, error) { if !config.Enabled { return nil, nil } orcCfg := oracle.Config{ Log: log, Network: magic, MainCfg: config, Chain: chain, OnTransaction: serv.RelayTxn, } orc, err := oracle.NewOracle(orcCfg) if err != nil { return nil, fmt.Errorf("can't initialize Oracle module: %w", err) } chain.SetOracle(orc) serv.AddService(orc) return orc, nil } func mkConsensus(config network.ServerConfig, chain *core.Blockchain, serv *network.Server, log *zap.Logger) (consensus.Service, error) { if config.Wallet == nil { return nil, nil } srv, err := consensus.NewService(consensus.Config{ Logger: log, Broadcast: serv.BroadcastExtensible, Chain: chain, ProtocolConfiguration: chain.GetConfig(), RequestTx: serv.RequestTx, Wallet: config.Wallet, TimePerBlock: config.TimePerBlock, }) if err != nil { return nil, fmt.Errorf("can't initialize Consensus module: %w", err) } serv.AddExtensibleHPService(srv, consensus.Category, srv.OnPayload, srv.OnTransaction) return srv, nil } func mkP2PNotary(config network.ServerConfig, chain *core.Blockchain, serv *network.Server, log *zap.Logger) (*notary.Notary, error) { if !config.P2PNotaryCfg.Enabled { return nil, nil } if !chain.P2PSigExtensionsEnabled() { return nil, errors.New("P2PSigExtensions are disabled, but Notary service is enabled") } cfg := notary.Config{ MainCfg: config.P2PNotaryCfg, Chain: chain, Log: log, } n, err := notary.NewNotary(cfg, serv.Net, serv.GetNotaryPool(), func(tx *transaction.Transaction) error { err := serv.RelayTxn(tx) if err != nil && !errors.Is(err, core.ErrAlreadyExists) { return fmt.Errorf("can't relay completed notary transaction: hash %s, error: %w", tx.Hash().StringLE(), err) } return nil }) if err != nil { return nil, fmt.Errorf("failed to create Notary module: %w", err) } serv.AddService(n) chain.SetNotary(n) return n, nil } func startServer(ctx *cli.Context) error { cfg, err := getConfigFromContext(ctx) if err != nil { return cli.NewExitError(err, 1) } log, logCloser, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration) if err != nil { return cli.NewExitError(err, 1) } if logCloser != nil { defer func() { _ = logCloser() }() } grace, cancel := context.WithCancel(newGraceContext()) defer cancel() serverConfig := network.NewServerConfig(cfg) chain, prometheus, pprof, err := initBCWithMetrics(cfg, log) if err != nil { return cli.NewExitError(err, 1) } defer func() { pprof.ShutDown() prometheus.ShutDown() chain.Close() }() serv, err := network.NewServer(serverConfig, chain, chain.GetStateSyncModule(), log) if err != nil { return cli.NewExitError(fmt.Errorf("failed to create network server: %w", err), 1) } srMod := chain.GetStateModule().(*corestate.Module) // Take full responsibility here. sr, err := stateroot.New(serverConfig.StateRootCfg, srMod, log, chain, serv.BroadcastExtensible) if err != nil { return cli.NewExitError(fmt.Errorf("can't initialize StateRoot service: %w", err), 1) } serv.AddExtensibleService(sr, stateroot.Category, sr.OnPayload) oracleSrv, err := mkOracle(cfg.ApplicationConfiguration.Oracle, cfg.ProtocolConfiguration.Magic, chain, serv, log) if err != nil { return cli.NewExitError(err, 1) } _, err = mkConsensus(serverConfig, chain, serv, log) if err != nil { return cli.NewExitError(err, 1) } _, err = mkP2PNotary(serverConfig, chain, serv, log) if err != nil { return cli.NewExitError(err, 1) } errChan := make(chan error) rpcServer := rpcsrv.New(chain, cfg.ApplicationConfiguration.RPC, serv, oracleSrv, log, errChan) serv.AddService(&rpcServer) go serv.Start(errChan) if !cfg.ApplicationConfiguration.RPC.StartWhenSynchronized { rpcServer.Start() } sigCh := make(chan os.Signal, 1) signal.Notify(sigCh, syscall.SIGHUP) signal.Notify(sigCh, syscall.SIGUSR1) fmt.Fprintln(ctx.App.Writer, Logo()) fmt.Fprintln(ctx.App.Writer, serv.UserAgent) fmt.Fprintln(ctx.App.Writer) var shutdownErr error Main: for { select { case err := <-errChan: shutdownErr = fmt.Errorf("server error: %w", err) cancel() case sig := <-sigCh: log.Info("signal received", zap.Stringer("name", sig)) cfgnew, err := getConfigFromContext(ctx) if err != nil { log.Warn("can't reread the config file, signal ignored", zap.Error(err)) break // Continue working. } if !cfg.ProtocolConfiguration.Equals(&cfgnew.ProtocolConfiguration) { log.Warn("ProtocolConfiguration changed, signal ignored") break // Continue working. } if !cfg.ApplicationConfiguration.EqualsButServices(&cfgnew.ApplicationConfiguration) { log.Warn("ApplicationConfiguration changed in incompatible way, signal ignored") break // Continue working. } configureAddresses(&cfgnew.ApplicationConfiguration) switch sig { case syscall.SIGHUP: rpcServer.Shutdown() rpcServer = rpcsrv.New(chain, cfgnew.ApplicationConfiguration.RPC, serv, oracleSrv, log, errChan) serv.AddService(&rpcServer) // Replaces old one by service name. if !cfgnew.ApplicationConfiguration.RPC.StartWhenSynchronized || serv.IsInSync() { rpcServer.Start() } pprof.ShutDown() pprof = metrics.NewPprofService(cfgnew.ApplicationConfiguration.Pprof, log) go pprof.Start() prometheus.ShutDown() prometheus = metrics.NewPrometheusService(cfgnew.ApplicationConfiguration.Prometheus, log) go prometheus.Start() case syscall.SIGUSR1: if oracleSrv != nil { chain.SetOracle(nil) rpcServer.SetOracleHandler(nil) oracleSrv.Shutdown() } oracleSrv, err = mkOracle(cfgnew.ApplicationConfiguration.Oracle, cfgnew.ProtocolConfiguration.Magic, chain, serv, log) if err != nil { log.Error("failed to create oracle service", zap.Error(err)) break // Keep going. } if oracleSrv != nil { rpcServer.SetOracleHandler(oracleSrv) if serv.IsInSync() { oracleSrv.Start() } } } cfg = cfgnew case <-grace.Done(): signal.Stop(sigCh) serv.Shutdown() break Main } } if shutdownErr != nil { return cli.NewExitError(shutdownErr, 1) } return nil } // configureAddresses sets up addresses for RPC, Prometheus and Pprof depending from the provided config. // In case RPC or Prometheus or Pprof Address provided each of them will use it. // In case global Address (of the node) provided and RPC/Prometheus/Pprof don't have configured addresses they will // use global one. So Node and RPC and Prometheus and Pprof will run on one address. func configureAddresses(cfg *config.ApplicationConfiguration) { if cfg.Address != "" { if cfg.RPC.Address == "" { cfg.RPC.Address = cfg.Address } if cfg.Prometheus.Address == "" { cfg.Prometheus.Address = cfg.Address } if cfg.Pprof.Address == "" { cfg.Pprof.Address = cfg.Address } } } // initBlockChain initializes BlockChain with preselected DB. func initBlockChain(cfg config.Config, log *zap.Logger) (*core.Blockchain, error) { store, err := storage.NewStore(cfg.ApplicationConfiguration.DBConfiguration) if err != nil { return nil, cli.NewExitError(fmt.Errorf("could not initialize storage: %w", err), 1) } chain, err := core.NewBlockchain(store, cfg.ProtocolConfiguration, log) if err != nil { return nil, cli.NewExitError(fmt.Errorf("could not initialize blockchain: %w", err), 1) } return chain, nil } // Logo returns Neo-Go logo. func Logo() string { return ` _ ____________ __________ / | / / ____/ __ \ / ____/ __ \ / |/ / __/ / / / /_____/ / __/ / / / / /| / /___/ /_/ /_____/ /_/ / /_/ / /_/ |_/_____/\____/ \____/\____/ ` }