package common

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"os/user"
	"runtime"
)

// 发送POST请求
// url：         请求地址
// data：        POST请求提交的数据
// contentType： 请求体格式，如：application/json
// content：     请求放回的内容
func Post(url string, data interface{}, contentType string) (string, error) {
	if contentType == "" {
		contentType = "application/json"
	}
	// 超时时间：5秒
	client := http.DefaultClient
	jsonStr, _ := json.Marshal(data)
	resp, err := client.Post(url, contentType, bytes.NewBuffer(jsonStr))
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	result, _ := ioutil.ReadAll(resp.Body)
	return string(result), nil
}

func StackTrace() string {
	ret := "\n\t\t[StackTrace]:\n"
	for i := 1; i < 40; i++ {
		pc, file, line, ok := runtime.Caller(i)
		if !ok {
			break
		}
		ret = fmt.Sprintf("%s\t\t%d. %s() %s:%d\n", ret, i, runtime.FuncForPC(pc).Name(), file, line)
	}
	return ret
}

func GetSystemUserName() string {
	if us, err := user.Current(); err != nil {
		return ""
	} else {
		return us.Username
	}
}