用于统计某个函数执行了多久 defer Trace(xxx...)()

trace.go

// Trace trace
func Trace(name string, param ...interface{}) func() {
	if !TraceSwitch {
		return func() {}
	}

	start := time.Now()
	log.Println("####Enter", name, param)

	return func() {
		_, file, line, ok := runtime.Caller(1)
		if !ok {
			file = "???"
			line = 0
		}

		for i := len(file) - 1; i > 0; i-- {
			if file[i] == '/' {
				file = file[i+1:]
				break
			}
		}

		log.Println("#####Exit", name, fmt.Sprintf("%s:%d", file, line), time.Since(start))
	}
}