neoneo-go/cli/server/server.go

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package server
import (
"context"
"fmt"
"os"
"os/signal"
"github.com/CityOfZion/neo-go/config"
"github.com/CityOfZion/neo-go/pkg/core"
"github.com/CityOfZion/neo-go/pkg/core/block"
"github.com/CityOfZion/neo-go/pkg/core/storage"
"github.com/CityOfZion/neo-go/pkg/encoding/address"
"github.com/CityOfZion/neo-go/pkg/io"
"github.com/CityOfZion/neo-go/pkg/network"
"github.com/CityOfZion/neo-go/pkg/network/metrics"
"github.com/CityOfZion/neo-go/pkg/rpc/server"
"github.com/pkg/errors"
"github.com/urfave/cli"
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"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.
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func handleLoggingParams(ctx *cli.Context, cfg config.ApplicationConfiguration) (*zap.Logger, error) {
level := zapcore.InfoLevel
if ctx.Bool("debug") {
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level = zapcore.DebugLevel
}
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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
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if logPath := cfg.LogPath; logPath != "" {
if err := io.MakeDirForFile(logPath, "logger"); err != nil {
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return nil, err
}
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cc.OutputPaths = []string{logPath}
}
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return cc.Build()
}
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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)
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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)
}
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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)
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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
}
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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
}
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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)
}
}
dump := newDump()
for ; i < skip+count; i++ {
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 {
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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)
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
}
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log, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration)
if err != nil {
return err
}
grace, cancel := context.WithCancel(newGraceContext())
defer cancel()
serverConfig := network.NewServerConfig(cfg)
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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.
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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)
}
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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 `
_ ____________ __________
/ | / / ____/ __ \ / ____/ __ \
/ |/ / __/ / / / /_____/ / __/ / / /
/ /| / /___/ /_/ /_____/ /_/ / /_/ /
/_/ |_/_____/\____/ \____/\____/
`
}