path: root/node/defaults.go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package node

import (
    "os"
    "os/user"
    "path/filepath"
    "runtime"

    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/p2p/nat"
)

const (
    DefaultHTTPHost = "localhost" // Default host interface for the HTTP RPC server
    DefaultHTTPPort = 8545        // Default TCP port for the HTTP RPC server
    DefaultWSHost   = "localhost" // Default host interface for the websocket RPC server
    DefaultWSPort   = 8546        // Default TCP port for the websocket RPC server
)

// DefaultConfig contains reasonable default settings.
var DefaultConfig = Config{
    DataDir:     DefaultDataDir(),
    HTTPPort:    DefaultHTTPPort,
    HTTPModules: []string{"net", "web3"},
    WSPort:      DefaultWSPort,
    WSModules:   []string{"net", "web3"},
    P2P: p2p.Config{
        ListenAddr: ":30303",
        MaxPeers:   25,
        NAT:        nat.Any(),
    },
}

// DefaultDataDir is the default data directory to use for the databases and other
// persistence requirements.
func DefaultDataDir() string {
    // Try to place the data folder in the user's home dir
    home := homeDir()
    if home != "" {
        if runtime.GOOS == "darwin" {
            return filepath.Join(home, "Library", "Ethereum")
        } else if runtime.GOOS == "windows" {
            return filepath.Join(home, "AppData", "Roaming", "Ethereum")
        } else {
            return filepath.Join(home, ".ethereum")
        }
    }
    // As we cannot guess a stable location, return empty and handle later
    return ""
}

func homeDir() string {
    if home := os.Getenv("HOME"); home != "" {
        return home
    }
    if usr, err := user.Current(); err == nil {
        return usr.HomeDir
    }
    return ""
}