返回错误的文件、行号、函数名

golang 开发中很多时候，会有err 排查错误，但是不知道具体的文件名和行号，很难定位
我们可以封装下，打印详细信息

package main

import (
	"fmt"
	"log"
	"runtime"
)

//this logs the function name as well.
func FancyHandleError(err error) (b bool) {
	if err != nil {
		// notice that we're using 1, so it will actually log the where
		// the error happened, 0 = this function, we don't want that.
		pc, fn, line, _ := runtime.Caller(1)

		//log.Printf("[error] in %s[%s:%d] %v", runtime.FuncForPC(pc).Name(), fn, line, err)
		fmt.Printf("[error] in %s[%s:%d] %v", runtime.FuncForPC(pc).Name(), fn, line, err)
		b = true
	}
	return
}

func main() {
	if FancyHandleError(fmt.Errorf("it's the end of the world")) {
		log.Print("stuff")
	}
}

验证

go run code/链表/链表交换相邻元素/main.go
[error] in main.main[/Users/zhangsan/Documents/GitHub/leetCode/code/链表/链表交换相邻元素/main.go:35] it's the end of the wor2021/06/30 09:40:01 stuff