function for tracking time used by function

time_tracer.go

package main

import (
	"time"
	"fmt"
	"log"
	"runtime"
	"github.com/fatih/color"
)

func timeTrack(start time.Time, funcName string) {
	elapsed := time.Since(start)

	coloredFunc := color.BlueString("%s", funcName)
	coloredTime := color.RedString("%s", elapsed)

	log.Printf("%s took: %s", coloredFunc, coloredTime)
}

func trace() string {
	pc := make([]uintptr, 10)  // at least 1 entry needed
	runtime.Callers(2, pc)
	f := runtime.FuncForPC(pc[0])
	file, line := f.FileLine(pc[0])
	//fmt.Printf("%s:%d %s\n", file, line, f.Name())

	return fmt.Sprintf("%s:%d %s", file, line, f.Name())
}

func main() {
	myFunc()
}

func myFunc() {
	defer timeTrack(time.Now(), trace())
	i := 0
	for i < 1000000000 { // one billion
		//fmt.Println("Myfunc")
		i++
	}
}