package server import ( "context" "fmt" "os" "os/signal" "github.com/nspcc-dev/neo-go/config" "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/storage" "github.com/nspcc-dev/neo-go/pkg/encoding/address" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/network" "github.com/nspcc-dev/neo-go/pkg/network/metrics" "github.com/nspcc-dev/neo-go/pkg/rpc/server" "github.com/pkg/errors" "github.com/urfave/cli" "go.uber.org/zap" "go.uber.org/zap/zapcore" ) // NewCommands returns 'node' command. func NewCommands() []cli.Command { var cfgFlags = []cli.Flag{ cli.StringFlag{Name: "config-path"}, cli.BoolFlag{Name: "privnet, p"}, cli.BoolFlag{Name: "mainnet, m"}, cli.BoolFlag{Name: "testnet, t"}, cli.BoolFlag{Name: "debug, d"}, } 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.UintFlag{ Name: "skip, s", Usage: "number of blocks to skip (default: 0)", }, cli.StringFlag{ Name: "in, i", Usage: "Input file (stdin if not given)", }, cli.StringFlag{ Name: "dump", Usage: "directory for storing JSON dumps", }, ) 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 path and mode flags in the given config and // returns appropriate config. func getConfigFromContext(ctx *cli.Context) (config.Config, error) { var net = config.ModePrivNet if ctx.Bool("testnet") { net = config.ModeTestNet } if ctx.Bool("mainnet") { net = config.ModeMainNet } configPath := "./config" if argCp := ctx.String("config-path"); argCp != "" { configPath = argCp } return config.Load(configPath, net) } // handleLoggingParams reads logging parameters. // If user selected debug level -- function enables it. // If logPath is configured -- function creates dir and file for logging. func handleLoggingParams(ctx *cli.Context, cfg config.ApplicationConfiguration) (*zap.Logger, 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, err } cc.OutputPaths = []string{logPath} } return cc.Build() } 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, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration) if err != nil { return cli.NewExitError(err, 1) } 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 } 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) for i := start; i < start+count; i++ { bh := chain.GetHeaderHash(int(i)) b, err := chain.GetBlock(bh) if err != nil { return cli.NewExitError(fmt.Errorf("failed to get block %d: %s", i, err), 1) } buf := io.NewBufBinWriter() b.EncodeBinary(buf.BinWriter) bytes := buf.Bytes() writer.WriteU32LE(uint32(len(bytes))) writer.WriteBytes(bytes) if writer.Err != nil { return cli.NewExitError(err, 1) } } pprof.ShutDown() prometheus.ShutDown() chain.Close() return nil } func restoreDB(ctx *cli.Context) error { cfg, err := getConfigFromContext(ctx) if err != nil { return err } log, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration) if err != nil { return cli.NewExitError(err, 1) } count := uint32(ctx.Uint("count")) skip := uint32(ctx.Uint("skip")) 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 chain.Close() defer prometheus.ShutDown() defer pprof.ShutDown() 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 } i := uint32(0) for ; i < skip; i++ { _, err := readBlock(reader) if err != nil { return cli.NewExitError(err, 1) } } gctx := newGraceContext() var lastIndex uint32 dump := newDump() defer func() { _ = dump.tryPersist(dumpDir, lastIndex) }() for ; i < skip+count; i++ { select { case <-gctx.Done(): return cli.NewExitError("cancelled", 1) default: } bytes, err := readBlock(reader) block := &block.Block{} newReader := io.NewBinReaderFromBuf(bytes) block.DecodeBinary(newReader) if err != nil { return cli.NewExitError(err, 1) } if block.Index == 0 && i == 0 && skip == 0 { genesis, err := chain.GetBlock(block.Hash()) if err == nil && genesis.Index == 0 { log.Info("skipped genesis block", zap.String("hash", block.Hash().StringLE())) continue } } err = chain.AddBlock(block) if err != nil { return cli.NewExitError(fmt.Errorf("failed to add block %d: %s", i, err), 1) } if dumpDir != "" { batch := chain.LastBatch() dump.add(block.Index, batch) lastIndex = block.Index if block.Index%1000 == 0 { if err := dump.tryPersist(dumpDir, block.Index); err != nil { return cli.NewExitError(fmt.Errorf("can't dump storage to file: %v", err), 1) } } } } return nil } // readBlock performs reading of block size and then bytes with the length equal to that size. func readBlock(reader *io.BinReader) ([]byte, error) { var size = reader.ReadU32LE() bytes := make([]byte, size) reader.ReadBytes(bytes) if reader.Err != nil { return nil, reader.Err } return bytes, nil } func startServer(ctx *cli.Context) error { cfg, err := getConfigFromContext(ctx) if err != nil { return err } log, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration) if err != nil { return err } grace, cancel := context.WithCancel(newGraceContext()) defer cancel() serverConfig := network.NewServerConfig(cfg) chain, prometheus, pprof, err := initBCWithMetrics(cfg, log) if err != nil { return err } serv, err := network.NewServer(serverConfig, chain, log) if err != nil { return cli.NewExitError(fmt.Errorf("failed to create network server: %v", err), 1) } rpcServer := server.New(chain, cfg.ApplicationConfiguration.RPC, serv, log) errChan := make(chan error) go serv.Start(errChan) go rpcServer.Start(errChan) fmt.Println(logo()) fmt.Println(serv.UserAgent) fmt.Println() var shutdownErr error Main: for { select { case err := <-errChan: shutdownErr = errors.Wrap(err, "Error encountered by server") cancel() case <-grace.Done(): serv.Shutdown() if serverErr := rpcServer.Shutdown(); serverErr != nil { shutdownErr = errors.Wrap(serverErr, "Error encountered whilst shutting down server") } prometheus.ShutDown() pprof.ShutDown() chain.Close() 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: %s", err), 1) } chain, err := core.NewBlockchain(store, cfg.ProtocolConfiguration, log) if err != nil { return nil, cli.NewExitError(fmt.Errorf("could not initialize blockchain: %s", err), 1) } if cfg.ProtocolConfiguration.AddressVersion != 0 { address.Prefix = cfg.ProtocolConfiguration.AddressVersion } return chain, nil } func logo() string { return ` _ ____________ __________ / | / / ____/ __ \ / ____/ __ \ / |/ / __/ / / / /_____/ / __/ / / / / /| / /___/ /_/ /_____/ /_/ / /_/ / /_/ |_/_____/\____/ \____/\____/ ` }