path: root/cmd/utils/cmd.go

/*
    This file is part of go-ethereum

    go-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    go-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @authors
 *  Jeffrey Wilcke <i@jev.io>
 *  Viktor Tron <viktor@ethdev.com>
 */
package utils

import (
    "fmt"
    "os"
    "os/signal"
    "regexp"

    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/state"
)

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 openLogFile(Datadir string, filename string) *os.File {
    path := ethutil.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? (%s)", r)
        }
    }
    return r == "y"
}

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 exit(err error) {
    status := 0
    if err != nil {
        fmt.Fprintln(os.Stderr, "Fatal: ", err)
        status = 1
    }
    logger.Flush()
    os.Exit(status)
}

// Fatalf formats a message to standard output and exits the program.
func Fatalf(format string, args ...interface{}) {
    fmt.Fprintf(os.Stderr, "Fatal: "+format+"\n", args...)
    logger.Flush()
    os.Exit(1)
}

func StartEthereum(ethereum *eth.Ethereum) {
    clilogger.Infoln("Starting ", ethereum.Name())
    if err := ethereum.Start(); err != nil {
        exit(err)
    }
    RegisterInterrupt(func(sig os.Signal) {
        ethereum.Stop()
        logger.Flush()
    })
}

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
}

// 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.ParentHash())

    statedb := state.New(parent.Root(), ethereum.StateDb())
    _, err := ethereum.BlockProcessor().TransitionState(statedb, parent, block, true)
    if err != nil {
        return err
    }

    return nil

}

func ImportChain(chain *core.ChainManager, fn string) error {
    fmt.Printf("importing chain '%s'\n", fn)
    fh, err := os.OpenFile(fn, os.O_RDONLY, os.ModePerm)
    if err != nil {
        return err
    }
    defer fh.Close()

    var blocks types.Blocks
    if err := rlp.Decode(fh, &blocks); err != nil {
        return err
    }

    chain.Reset()
    if err := chain.InsertChain(blocks); err != nil {
        return err
    }
    fmt.Printf("imported %d blocks\n", len(blocks))

    return nil
}