common/common.go


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package common

import (
    "fmt"
    "math/big"
    "runtime"
    "time"
)

// 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())
}

// 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))
}