quorum/common/common.go

package common

import (
	"fmt"
	"math/big"
	"os"
	"os/user"
	"path"
	"path/filepath"
	"runtime"
	"time"

	"github.com/kardianos/osext"
)

// MakeName creates a node name that follows the ethereum convention
// for such names. It adds the operation system name and Go runtime version
// the name.
func MakeName(name, version string) string {
	return fmt.Sprintf("%s/v%s/%s/%s", name, version, runtime.GOOS, runtime.Version())
}

func DefaultAssetPath() string {
	var assetPath string
	pwd, _ := os.Getwd()
	srcdir := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist")

	// If the current working directory is the go-ethereum dir
	// assume a debug build and use the source directory as
	// asset directory.
	if pwd == srcdir {
		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 = "."
		}
	}

	// Check if the assetPath exists. If not, try the source directory
	// This happens when binary is run from outside cmd/mist directory
	if _, err := os.Stat(assetPath); os.IsNotExist(err) {
		assetPath = path.Join(srcdir, "assets")
	}

	return assetPath
}

func DefaultDataDir() string {
	usr, _ := user.Current()
	if runtime.GOOS == "darwin" {
		return path.Join(usr.HomeDir, "Library/Ethereum")
	} else if runtime.GOOS == "windows" {
		return path.Join(usr.HomeDir, "AppData/Roaming/Ethereum")
	} else {
		return path.Join(usr.HomeDir, ".ethereum")
	}
}

func IsWindows() bool {
	return runtime.GOOS == "windows"
}

func WindonizePath(path string) string {
	if string(path[0]) == "/" && IsWindows() {
		path = path[1:]
	}
	return path
}

// Common big integers often used
var (
	Big1     = big.NewInt(1)
	Big2     = big.NewInt(2)
	Big3     = big.NewInt(3)
	Big0     = big.NewInt(0)
	BigTrue  = Big1
	BigFalse = Big0
	Big32    = big.NewInt(32)
	Big256   = big.NewInt(0xff)
	Big257   = big.NewInt(257)
)

func Bench(pre string, cb func()) {
	start := time.Now()
	cb()
	fmt.Println(pre, ": took:", time.Since(start))
}