path: root/cmd/geth/config.go

// Copyright 2017 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/>.

package main

import (
    "bufio"
    "errors"
    "fmt"
    "io"
    "os"
    "reflect"
    "unicode"

    cli "gopkg.in/urfave/cli.v1"

    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/dashboard"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/params"
    whisper "github.com/ethereum/go-ethereum/whisper/whisperv5"
    "github.com/naoina/toml"
)

var (
    dumpConfigCommand = cli.Command{
        Action:      utils.MigrateFlags(dumpConfig),
        Name:        "dumpconfig",
        Usage:       "Show configuration values",
        ArgsUsage:   "",
        Flags:       append(append(nodeFlags, rpcFlags...), whisperFlags...),
        Category:    "MISCELLANEOUS COMMANDS",
        Description: `The dumpconfig command shows configuration values.`,
    }

    configFileFlag = cli.StringFlag{
        Name:  "config",
        Usage: "TOML configuration file",
    }
)

// These settings ensure that TOML keys use the same names as Go struct fields.
var tomlSettings = toml.Config{
    NormFieldName: func(rt reflect.Type, key string) string {
        return key
    },
    FieldToKey: func(rt reflect.Type, field string) string {
        return field
    },
    MissingField: func(rt reflect.Type, field string) error {
        link := ""
        if unicode.IsUpper(rune(rt.Name()[0])) && rt.PkgPath() != "main" {
            link = fmt.Sprintf(", see https://godoc.org/%s#%s for available fields", rt.PkgPath(), rt.Name())
        }
        return fmt.Errorf("field '%s' is not defined in %s%s", field, rt.String(), link)
    },
}

type ethstatsConfig struct {
    URL string `toml:",omitempty"`
}

type gethConfig struct {
    Eth       eth.Config
    Shh       whisper.Config
    Node      node.Config
    Ethstats  ethstatsConfig
    Dashboard dashboard.Config
}

func loadConfig(file string, cfg *gethConfig) error {
    f, err := os.Open(file)
    if err != nil {
        return err
    }
    defer f.Close()

    err = tomlSettings.NewDecoder(bufio.NewReader(f)).Decode(cfg)
    // Add file name to errors that have a line number.
    if _, ok := err.(*toml.LineError); ok {
        err = errors.New(file + ", " + err.Error())
    }
    return err
}

func defaultNodeConfig() node.Config {
    cfg := node.DefaultConfig
    cfg.Name = clientIdentifier
    cfg.Version = params.VersionWithCommit(gitCommit)
    cfg.HTTPModules = append(cfg.HTTPModules, "eth", "shh")
    cfg.WSModules = append(cfg.WSModules, "eth", "shh")
    cfg.IPCPath = "geth.ipc"
    return cfg
}

func makeConfigNode(ctx *cli.Context) (*node.Node, gethConfig) {
    // Load defaults.
    cfg := gethConfig{
        Eth:       eth.DefaultConfig,
        Shh:       whisper.DefaultConfig,
        Node:      defaultNodeConfig(),
        Dashboard: dashboard.DefaultConfig,
    }

    // Load config file.
    if file := ctx.GlobalString(configFileFlag.Name); file != "" {
        if err := loadConfig(file, &cfg); err != nil {
            utils.Fatalf("%v", err)
        }
    }

    // Apply flags.
    utils.SetNodeConfig(ctx, &cfg.Node)
    stack, err := node.New(&cfg.Node)
    if err != nil {
        utils.Fatalf("Failed to create the protocol stack: %v", err)
    }
    utils.SetEthConfig(ctx, stack, &cfg.Eth)
    if ctx.GlobalIsSet(utils.EthStatsURLFlag.Name) {
        cfg.Ethstats.URL = ctx.GlobalString(utils.EthStatsURLFlag.Name)
    }

    utils.SetShhConfig(ctx, stack, &cfg.Shh)
    utils.SetDashboardConfig(ctx, &cfg.Dashboard)

    return stack, cfg
}

// enableWhisper returns true in case one of the whisper flags is set.
func enableWhisper(ctx *cli.Context) bool {
    for _, flag := range whisperFlags {
        if ctx.GlobalIsSet(flag.GetName()) {
            return true
        }
    }
    return false
}

func makeFullNode(ctx *cli.Context) *node.Node {
    stack, cfg := makeConfigNode(ctx)

    utils.RegisterEthService(stack, &cfg.Eth)

    if ctx.GlobalBool(utils.DashboardEnabledFlag.Name) {
        utils.RegisterDashboardService(stack, &cfg.Dashboard, gitCommit)
    }
    // Whisper must be explicitly enabled by specifying at least 1 whisper flag or in dev mode
    shhEnabled := enableWhisper(ctx)
    shhAutoEnabled := !ctx.GlobalIsSet(utils.WhisperEnabledFlag.Name) && ctx.GlobalIsSet(utils.DeveloperFlag.Name)
    if shhEnabled || shhAutoEnabled {
        if ctx.GlobalIsSet(utils.WhisperMaxMessageSizeFlag.Name) {
            cfg.Shh.MaxMessageSize = uint32(ctx.Int(utils.WhisperMaxMessageSizeFlag.Name))
        }
        if ctx.GlobalIsSet(utils.WhisperMinPOWFlag.Name) {
            cfg.Shh.MinimumAcceptedPOW = ctx.Float64(utils.WhisperMinPOWFlag.Name)
        }
        utils.RegisterShhService(stack, &cfg.Shh)
    }

    // Add the Ethereum Stats daemon if requested.
    if cfg.Ethstats.URL != "" {
        utils.RegisterEthStatsService(stack, cfg.Ethstats.URL)
    }
    return stack
}

// dumpConfig is the dumpconfig command.
func dumpConfig(ctx *cli.Context) error {
    _, cfg := makeConfigNode(ctx)
    comment := ""

    if cfg.Eth.Genesis != nil {
        cfg.Eth.Genesis = nil
        comment += "# Note: this config doesn't contain the genesis block.\n\n"
    }

    out, err := tomlSettings.Marshal(&cfg)
    if err != nil {
        return err
    }
    io.WriteString(os.Stdout, comment)
    os.Stdout.Write(out)
    return nil
}