path: root/cmd/utils/cmd.go

package utils

import (
    "fmt"
    "io"
    "log"
    "os"
    "os/signal"
    "path"
    "path/filepath"
    "regexp"
    "runtime"
    "time"

    "bitbucket.org/kardianos/osext"
    "github.com/ethereum/go-ethereum"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/ethminer"
    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/ethwire"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/rpc"
    "github.com/ethereum/go-ethereum/xeth"
)

var clilogger = logger.NewLogger("CLI")
var interruptCallbacks = []func(os.Signal){}

// Register interrupt handlers callbacks
func RegisterInterrupt(cb func(os.Signal)) {
    interruptCallbacks = append(interruptCallbacks, cb)
}

// go routine that call interrupt handlers in order of registering
func HandleInterrupt() {
    c := make(chan os.Signal, 1)
    go func() {
        signal.Notify(c, os.Interrupt)
        for sig := range c {
            clilogger.Errorf("Shutting down (%v) ... \n", sig)
            RunInterruptCallbacks(sig)
        }
    }()
}

func RunInterruptCallbacks(sig os.Signal) {
    for _, cb := range interruptCallbacks {
        cb(sig)
    }
}

func AbsolutePath(Datadir string, filename string) string {
    if path.IsAbs(filename) {
        return filename
    }
    return path.Join(Datadir, filename)
}

func openLogFile(Datadir string, filename string) *os.File {
    path := AbsolutePath(Datadir, filename)
    file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
    if err != nil {
        panic(fmt.Sprintf("error opening log file '%s': %v", filename, err))
    }
    return file
}

func confirm(message string) bool {
    fmt.Println(message, "Are you sure? (y/n)")
    var r string
    fmt.Scanln(&r)
    for ; ; fmt.Scanln(&r) {
        if r == "n" || r == "y" {
            break
        } else {
            fmt.Printf("Yes or no?", r)
        }
    }
    return r == "y"
}

func DBSanityCheck(db ethutil.Database) error {
    d, _ := db.Get([]byte("ProtocolVersion"))
    protov := ethutil.NewValue(d).Uint()
    if protov != eth.ProtocolVersion && protov != 0 {
        return fmt.Errorf("Database version mismatch. Protocol(%d / %d). `rm -rf %s`", protov, eth.ProtocolVersion, ethutil.Config.ExecPath+"/database")
    }

    return nil
}

func InitDataDir(Datadir string) {
    _, err := os.Stat(Datadir)
    if err != nil {
        if os.IsNotExist(err) {
            fmt.Printf("Data directory '%s' doesn't exist, creating it\n", Datadir)
            os.Mkdir(Datadir, 0777)
        }
    }
}

func InitLogging(Datadir string, LogFile string, LogLevel int, DebugFile string) logger.LogSystem {
    var writer io.Writer
    if LogFile == "" {
        writer = os.Stdout
    } else {
        writer = openLogFile(Datadir, LogFile)
    }

    sys := logger.NewStdLogSystem(writer, log.LstdFlags, logger.LogLevel(LogLevel))
    logger.AddLogSystem(sys)
    if DebugFile != "" {
        writer = openLogFile(Datadir, DebugFile)
        logger.AddLogSystem(logger.NewStdLogSystem(writer, log.LstdFlags, logger.DebugLevel))
    }

    return sys
}

func InitConfig(vmType int, ConfigFile string, Datadir string, EnvPrefix string) *ethutil.ConfigManager {
    InitDataDir(Datadir)
    cfg := ethutil.ReadConfig(ConfigFile, Datadir, EnvPrefix)
    cfg.VmType = vmType

    return cfg
}

func exit(err error) {
    status := 0
    if err != nil {
        clilogger.Errorln("Fatal: ", err)
        status = 1
    }
    logger.Flush()
    os.Exit(status)
}

func NewDatabase() ethutil.Database {
    db, err := ethdb.NewLDBDatabase("database")
    if err != nil {
        exit(err)
    }
    return db
}

func NewClientIdentity(clientIdentifier, version, customIdentifier string) *ethwire.SimpleClientIdentity {
    clilogger.Infoln("identity created")
    return ethwire.NewSimpleClientIdentity(clientIdentifier, version, customIdentifier)
}

func NewEthereum(db ethutil.Database, clientIdentity ethwire.ClientIdentity, keyManager *crypto.KeyManager, usePnp bool, OutboundPort string, MaxPeer int) *eth.Ethereum {
    ethereum, err := eth.New(db, clientIdentity, keyManager, eth.CapDefault, usePnp)
    if err != nil {
        clilogger.Fatalln("eth start err:", err)
    }
    ethereum.Port = OutboundPort
    ethereum.MaxPeers = MaxPeer
    return ethereum
}

func StartEthereum(ethereum *eth.Ethereum, UseSeed bool) {
    clilogger.Infof("Starting %s", ethereum.ClientIdentity())
    ethereum.Start(UseSeed)
    RegisterInterrupt(func(sig os.Signal) {
        ethereum.Stop()
        logger.Flush()
    })
}

func ShowGenesis(ethereum *eth.Ethereum) {
    clilogger.Infoln(ethereum.ChainManager().Genesis())
    exit(nil)
}

func NewKeyManager(KeyStore string, Datadir string, db ethutil.Database) *crypto.KeyManager {
    var keyManager *crypto.KeyManager
    switch {
    case KeyStore == "db":
        keyManager = crypto.NewDBKeyManager(db)
    case KeyStore == "file":
        keyManager = crypto.NewFileKeyManager(Datadir)
    default:
        exit(fmt.Errorf("unknown keystore type: %s", KeyStore))
    }
    return keyManager
}

func DefaultAssetPath() string {
    var assetPath string
    // If the current working directory is the go-ethereum dir
    // assume a debug build and use the source directory as
    // asset directory.
    pwd, _ := os.Getwd()
    if pwd == path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist") {
        assetPath = path.Join(pwd, "assets")
    } else {
        switch runtime.GOOS {
        case "darwin":
            // Get Binary Directory
            exedir, _ := osext.ExecutableFolder()
            assetPath = filepath.Join(exedir, "../Resources")
        case "linux":
            assetPath = "/usr/share/mist"
        case "windows":
            assetPath = "./assets"
        default:
            assetPath = "."
        }
    }
    return assetPath
}

func KeyTasks(keyManager *crypto.KeyManager, KeyRing string, GenAddr bool, SecretFile string, ExportDir string, NonInteractive bool) {

    var err error
    switch {
    case GenAddr:
        if NonInteractive || confirm("This action overwrites your old private key.") {
            err = keyManager.Init(KeyRing, 0, true)
        }
        exit(err)
    case len(SecretFile) > 0:
        SecretFile = ethutil.ExpandHomePath(SecretFile)

        if NonInteractive || confirm("This action overwrites your old private key.") {
            err = keyManager.InitFromSecretsFile(KeyRing, 0, SecretFile)
        }
        exit(err)
    case len(ExportDir) > 0:
        err = keyManager.Init(KeyRing, 0, false)
        if err == nil {
            err = keyManager.Export(ExportDir)
        }
        exit(err)
    default:
        // Creates a keypair if none exists
        err = keyManager.Init(KeyRing, 0, false)
        if err != nil {
            exit(err)
        }
    }
}

func StartRpc(ethereum *eth.Ethereum, RpcPort int) {
    var err error
    ethereum.RpcServer, err = rpc.NewJsonRpcServer(xeth.NewJSXEth(ethereum), RpcPort)
    if err != nil {
        clilogger.Errorf("Could not start RPC interface (port %v): %v", RpcPort, err)
    } else {
        go ethereum.RpcServer.Start()
    }
}

var miner *ethminer.Miner

func GetMiner() *ethminer.Miner {
    return miner
}

func StartMining(ethereum *eth.Ethereum) bool {
    if !ethereum.Mining {
        ethereum.Mining = true
        addr := ethereum.KeyManager().Address()

        go func() {
            clilogger.Infoln("Start mining")
            if miner == nil {
                miner = ethminer.NewDefaultMiner(addr, ethereum)
            }
            // Give it some time to connect with peers
            time.Sleep(3 * time.Second)
            for !ethereum.IsUpToDate() {
                time.Sleep(5 * time.Second)
            }
            miner.Start()
        }()
        RegisterInterrupt(func(os.Signal) {
            StopMining(ethereum)
        })
        return true
    }
    return false
}

func FormatTransactionData(data string) []byte {
    d := ethutil.StringToByteFunc(data, func(s string) (ret []byte) {
        slice := regexp.MustCompile("\\n|\\s").Split(s, 1000000000)
        for _, dataItem := range slice {
            d := ethutil.FormatData(dataItem)
            ret = append(ret, d...)
        }
        return
    })

    return d
}

func StopMining(ethereum *eth.Ethereum) bool {
    if ethereum.Mining && miner != nil {
        miner.Stop()
        clilogger.Infoln("Stopped mining")
        ethereum.Mining = false

        return true
    }

    return false
}

// Replay block
func BlockDo(ethereum *eth.Ethereum, hash []byte) error {
    block := ethereum.ChainManager().GetBlock(hash)
    if block == nil {
        return fmt.Errorf("unknown block %x", hash)
    }

    parent := ethereum.ChainManager().GetBlock(block.PrevHash)

    _, err := ethereum.StateManager().ApplyDiff(parent.State(), parent, block)
    if err != nil {
        return err
    }

    return nil

}