neoneo-go/cli/server/server.go

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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"
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"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"
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"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) {
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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 {
return nil, nil, err
}
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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
}
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cc.OutputPaths = []string{logPath}
}
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log, err := cc.Build()
return log, _winfileSinkCloser, err
}
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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)
}
log, logCloser, err := handleLoggingParams(ctx, cfg.ApplicationConfiguration)
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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)
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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)
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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
}
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chain, prometheus, pprof, err := initBCWithMetrics(cfg, log)
if err != nil {
return err
}
cli: ensure chain is properly stopped after chain-related commands Blockchain occupies resources (e.g. it opens log files for DB, etc.) on creation and running. We need to release these resources if something goes wrong during execution chain-related commands. This commit solves the following problem on Windows: ``` --- FAIL: TestServerStart (0.32s) --- FAIL: TestServerStart/stateroot_service_is_on_&&_StateRootInHeader=true (0.04s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_stateroot_service_is_on_&&_StateRootInHeader=true460557297\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_Oracle_config (0.03s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_Oracle_config810064028\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_consensus_config (0.04s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_consensus_config217270091\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_Notary_config (0.07s) --- FAIL: TestServerStart/invalid_Notary_config/malformed_config (0.04s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_Notary_config_malformed_config754934830\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_Notary_config/invalid_wallet (0.03s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_Notary_config_invalid_wallet934249397\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/good (0.11s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_good596150160\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. ``` This commit also unifies blockchain and services releasing code.
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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
}
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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)
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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)
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chain, prometheus, pprof, err := initBCWithMetrics(cfg, log)
if err != nil {
return cli.NewExitError(err, 1)
}
cli: ensure chain is properly stopped after chain-related commands Blockchain occupies resources (e.g. it opens log files for DB, etc.) on creation and running. We need to release these resources if something goes wrong during execution chain-related commands. This commit solves the following problem on Windows: ``` --- FAIL: TestServerStart (0.32s) --- FAIL: TestServerStart/stateroot_service_is_on_&&_StateRootInHeader=true (0.04s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_stateroot_service_is_on_&&_StateRootInHeader=true460557297\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_Oracle_config (0.03s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_Oracle_config810064028\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_consensus_config (0.04s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_consensus_config217270091\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_Notary_config (0.07s) --- FAIL: TestServerStart/invalid_Notary_config/malformed_config (0.04s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_Notary_config_malformed_config754934830\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/invalid_Notary_config/invalid_wallet (0.03s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_invalid_Notary_config_invalid_wallet934249397\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. --- FAIL: TestServerStart/good (0.11s) testing.go:894: TempDir RemoveAll cleanup: remove C:\Users\Anna\AppData\Local\Temp\TestServerStart_good596150160\001\neogotestchain\000001.log: The process cannot access the file because it is being used by another process. ``` This commit also unifies blockchain and services releasing code.
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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)
}
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_, err = mkConsensus(serverConfig, chain, serv, log)
if err != nil {
return cli.NewExitError(err, 1)
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}
_, 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.
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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: %w", 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: %w", err), 1)
}
return chain, nil
}
// Logo returns Neo-Go logo.
func Logo() string {
return `
_ ____________ __________
/ | / / ____/ __ \ / ____/ __ \
/ |/ / __/ / / / /_____/ / __/ / / /
/ /| / /___/ /_/ /_____/ /_/ / /_/ /
/_/ |_/_____/\____/ \____/\____/
`
}