path: root/cmd/geth/main.go

// Copyright 2014 The go-ethereum Authors
// 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/>.

// geth is the official command-line client for Ethereum.
package main

import (
    "encoding/hex"
    "fmt"
    "io/ioutil"
    "os"
    "path/filepath"
    "runtime"
    "strconv"
    "strings"
    "time"

    "github.com/ethereum/ethash"
    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/console"
    "github.com/ethereum/go-ethereum/contracts/release"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/internal/debug"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/metrics"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/rlp"
    "gopkg.in/urfave/cli.v1"
)

const (
    clientIdentifier = "geth" // Client identifier to advertise over the network
)

var (
    // Git SHA1 commit hash of the release (set via linker flags)
    gitCommit = ""
    // Ethereum address of the Geth release oracle.
    relOracle = common.HexToAddress("0xfa7b9770ca4cb04296cac84f37736d4041251cdf")
    // The app that holds all commands and flags.
    app = utils.NewApp(gitCommit, "the go-ethereum command line interface")
)

func init() {
    // Initialize the CLI app and start Geth
    app.Action = geth
    app.HideVersion = true // we have a command to print the version
    app.Copyright = "Copyright 2013-2016 The go-ethereum Authors"
    app.Commands = []cli.Command{
        importCommand,
        exportCommand,
        upgradedbCommand,
        removedbCommand,
        dumpCommand,
        monitorCommand,
        accountCommand,
        walletCommand,
        consoleCommand,
        attachCommand,
        javascriptCommand,
        {
            Action:    makedag,
            Name:      "makedag",
            Usage:     "Generate ethash DAG (for testing)",
            ArgsUsage: "<blockNum> <outputDir>",
            Category:  "MISCELLANEOUS COMMANDS",
            Description: `
The makedag command generates an ethash DAG in /tmp/dag.

This command exists to support the system testing project.
Regular users do not need to execute it.
`,
        },
        {
            Action:    version,
            Name:      "version",
            Usage:     "Print version numbers",
            ArgsUsage: " ",
            Category:  "MISCELLANEOUS COMMANDS",
            Description: `
The output of this command is supposed to be machine-readable.
`,
        },
        {
            Action:    initGenesis,
            Name:      "init",
            Usage:     "Bootstrap and initialize a new genesis block",
            ArgsUsage: "<genesisPath>",
            Category:  "BLOCKCHAIN COMMANDS",
            Description: `
The init command initializes a new genesis block and definition for the network.
This is a destructive action and changes the network in which you will be
participating.
`,
        },
        {
            Action:    license,
            Name:      "license",
            Usage:     "Display license information",
            ArgsUsage: " ",
            Category:  "MISCELLANEOUS COMMANDS",
        },
    }

    app.Flags = []cli.Flag{
        utils.IdentityFlag,
        utils.UnlockedAccountFlag,
        utils.PasswordFileFlag,
        utils.BootnodesFlag,
        utils.DataDirFlag,
        utils.KeyStoreDirFlag,
        utils.OlympicFlag,
        utils.FastSyncFlag,
        utils.LightModeFlag,
        utils.LightServFlag,
        utils.LightPeersFlag,
        utils.LightKDFFlag,
        utils.CacheFlag,
        utils.TrieCacheGenFlag,
        utils.JSpathFlag,
        utils.ListenPortFlag,
        utils.MaxPeersFlag,
        utils.MaxPendingPeersFlag,
        utils.EtherbaseFlag,
        utils.GasPriceFlag,
        utils.MinerThreadsFlag,
        utils.MiningEnabledFlag,
        utils.AutoDAGFlag,
        utils.TargetGasLimitFlag,
        utils.NATFlag,
        utils.NatspecEnabledFlag,
        utils.NoDiscoverFlag,
        utils.DiscoveryV5Flag,
        utils.NetrestrictFlag,
        utils.NodeKeyFileFlag,
        utils.NodeKeyHexFlag,
        utils.RPCEnabledFlag,
        utils.RPCListenAddrFlag,
        utils.RPCPortFlag,
        utils.RPCApiFlag,
        utils.WSEnabledFlag,
        utils.WSListenAddrFlag,
        utils.WSPortFlag,
        utils.WSApiFlag,
        utils.WSAllowedOriginsFlag,
        utils.IPCDisabledFlag,
        utils.IPCApiFlag,
        utils.IPCPathFlag,
        utils.ExecFlag,
        utils.PreloadJSFlag,
        utils.WhisperEnabledFlag,
        utils.DevModeFlag,
        utils.TestNetFlag,
        utils.VMForceJitFlag,
        utils.VMJitCacheFlag,
        utils.VMEnableJitFlag,
        utils.NetworkIdFlag,
        utils.RPCCORSDomainFlag,
        utils.EthStatsURLFlag,
        utils.MetricsEnabledFlag,
        utils.FakePoWFlag,
        utils.SolcPathFlag,
        utils.GpoMinGasPriceFlag,
        utils.GpoMaxGasPriceFlag,
        utils.GpoFullBlockRatioFlag,
        utils.GpobaseStepDownFlag,
        utils.GpobaseStepUpFlag,
        utils.GpobaseCorrectionFactorFlag,
        utils.ExtraDataFlag,
    }
    app.Flags = append(app.Flags, debug.Flags...)

    app.Before = func(ctx *cli.Context) error {
        runtime.GOMAXPROCS(runtime.NumCPU())
        if err := debug.Setup(ctx); err != nil {
            return err
        }
        // Start system runtime metrics collection
        go metrics.CollectProcessMetrics(3 * time.Second)

        // This should be the only place where reporting is enabled
        // because it is not intended to run while testing.
        // In addition to this check, bad block reports are sent only
        // for chains with the main network genesis block and network id 1.
        eth.EnableBadBlockReporting = true

        utils.SetupNetwork(ctx)
        return nil
    }

    app.After = func(ctx *cli.Context) error {
        logger.Flush()
        debug.Exit()
        console.Stdin.Close() // Resets terminal mode.
        return nil
    }
}

func main() {
    if err := app.Run(os.Args); err != nil {
        fmt.Fprintln(os.Stderr, err)
        os.Exit(1)
    }
}

// geth is the main entry point into the system if no special subcommand is ran.
// It creates a default node based on the command line arguments and runs it in
// blocking mode, waiting for it to be shut down.
func geth(ctx *cli.Context) error {
    node := makeFullNode(ctx)
    startNode(ctx, node)
    node.Wait()
    return nil
}

// initGenesis will initialise the given JSON format genesis file and writes it as
// the zero'd block (i.e. genesis) or will fail hard if it can't succeed.
func initGenesis(ctx *cli.Context) error {
    genesisPath := ctx.Args().First()
    if len(genesisPath) == 0 {
        utils.Fatalf("must supply path to genesis JSON file")
    }

    stack := makeFullNode(ctx)
    chaindb := utils.MakeChainDatabase(ctx, stack)

    genesisFile, err := os.Open(genesisPath)
    if err != nil {
        utils.Fatalf("failed to read genesis file: %v", err)
    }

    block, err := core.WriteGenesisBlock(chaindb, genesisFile)
    if err != nil {
        utils.Fatalf("failed to write genesis block: %v", err)
    }
    glog.V(logger.Info).Infof("successfully wrote genesis block and/or chain rule set: %x", block.Hash())
    return nil
}

func makeFullNode(ctx *cli.Context) *node.Node {
    // Create the default extradata and construct the base node
    var clientInfo = struct {
        Version   uint
        Name      string
        GoVersion string
        Os        string
    }{uint(params.VersionMajor<<16 | params.VersionMinor<<8 | params.VersionPatch), clientIdentifier, runtime.Version(), runtime.GOOS}
    extra, err := rlp.EncodeToBytes(clientInfo)
    if err != nil {
        glog.V(logger.Warn).Infoln("error setting canonical miner information:", err)
    }
    if uint64(len(extra)) > params.MaximumExtraDataSize.Uint64() {
        glog.V(logger.Warn).Infoln("error setting canonical miner information: extra exceeds", params.MaximumExtraDataSize)
        glog.V(logger.Debug).Infof("extra: %x\n", extra)
        extra = nil
    }
    stack := utils.MakeNode(ctx, clientIdentifier, gitCommit)
    utils.RegisterEthService(ctx, stack, extra)

    // Whisper must be explicitly enabled, but is auto-enabled in --dev mode.
    shhEnabled := ctx.GlobalBool(utils.WhisperEnabledFlag.Name)
    shhAutoEnabled := !ctx.GlobalIsSet(utils.WhisperEnabledFlag.Name) && ctx.GlobalIsSet(utils.DevModeFlag.Name)
    if shhEnabled || shhAutoEnabled {
        utils.RegisterShhService(stack)
    }
    // Add the Ethereum Stats daemon if requested
    if url := ctx.GlobalString(utils.EthStatsURLFlag.Name); url != "" {
        utils.RegisterEthStatsService(stack, url)
    }
    // Add the release oracle service so it boots along with node.
    if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
        config := release.Config{
            Oracle: relOracle,
            Major:  uint32(params.VersionMajor),
            Minor:  uint32(params.VersionMinor),
            Patch:  uint32(params.VersionPatch),
        }
        commit, _ := hex.DecodeString(gitCommit)
        copy(config.Commit[:], commit)
        return release.NewReleaseService(ctx, config)
    }); err != nil {
        utils.Fatalf("Failed to register the Geth release oracle service: %v", err)
    }
    return stack
}

// startNode boots up the system node and all registered protocols, after which
// it unlocks any requested accounts, and starts the RPC/IPC interfaces and the
// miner.
func startNode(ctx *cli.Context, stack *node.Node) {
    // Start up the node itself
    utils.StartNode(stack)

    // Unlock any account specifically requested
    accman := stack.AccountManager()
    passwords := utils.MakePasswordList(ctx)
    accounts := strings.Split(ctx.GlobalString(utils.UnlockedAccountFlag.Name), ",")
    for i, account := range accounts {
        if trimmed := strings.TrimSpace(account); trimmed != "" {
            unlockAccount(ctx, accman, trimmed, i, passwords)
        }
    }
    // Start auxiliary services if enabled
    if ctx.GlobalBool(utils.MiningEnabledFlag.Name) {
        var ethereum *eth.Ethereum
        if err := stack.Service(&ethereum); err != nil {
            utils.Fatalf("ethereum service not running: %v", err)
        }
        if err := ethereum.StartMining(ctx.GlobalInt(utils.MinerThreadsFlag.Name)); err != nil {
            utils.Fatalf("Failed to start mining: %v", err)
        }
    }
}

func makedag(ctx *cli.Context) error {
    args := ctx.Args()
    wrongArgs := func() {
        utils.Fatalf(`Usage: geth makedag <block number> <outputdir>`)
    }
    switch {
    case len(args) == 2:
        blockNum, err := strconv.ParseUint(args[0], 0, 64)
        dir := args[1]
        if err != nil {
            wrongArgs()
        } else {
            dir = filepath.Clean(dir)
            // seems to require a trailing slash
            if !strings.HasSuffix(dir, "/") {
                dir = dir + "/"
            }
            _, err = ioutil.ReadDir(dir)
            if err != nil {
                utils.Fatalf("Can't find dir")
            }
            fmt.Println("making DAG, this could take awhile...")
            ethash.MakeDAG(blockNum, dir)
        }
    default:
        wrongArgs()
    }
    return nil
}

func version(ctx *cli.Context) error {
    fmt.Println(strings.Title(clientIdentifier))
    fmt.Println("Version:", params.Version)
    if gitCommit != "" {
        fmt.Println("Git Commit:", gitCommit)
    }
    fmt.Println("Protocol Versions:", eth.ProtocolVersions)
    fmt.Println("Network Id:", ctx.GlobalInt(utils.NetworkIdFlag.Name))
    fmt.Println("Go Version:", runtime.Version())
    fmt.Println("OS:", runtime.GOOS)
    fmt.Printf("GOPATH=%s\n", os.Getenv("GOPATH"))
    fmt.Printf("GOROOT=%s\n", runtime.GOROOT())
    return nil
}

func license(_ *cli.Context) error {
    fmt.Println(`Geth 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.

Geth 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 geth. If not, see <http://www.gnu.org/licenses/>.
`)
    return nil
}