go flag的常用设置

package main

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

var ZabbixTarget, ZabbixMessage, ZabbixType, PrometheusAlertUrl string
var help bool

func init() {
    //zabbix传入参数发送目标，告警消息，目标类型
    flag.StringVar(&ZabbixTarget, "t", "", "指定告警消息的接收目标的`手机号/钉钉url/微信url/飞书url/百度Hi(如流)url`")
    flag.StringVar(&ZabbixMessage, "m", "zabbix告警测试", "需要发送的`告警消息内容`")
    flag.StringVar(&ZabbixType, "type", "dd", "告警消息的目标类型,支持`txdx(腾讯云短信)、txdh(腾讯云电话)、alydx(阿里云短信)、alydh(阿里云电话)、hwdx(华为云短信)、bddx(百度云短信)、rlydh(荣联云电话)、7moordx（七陌短信）、7moordh（七陌电话）、dd(钉钉)、wx(微信)、fs(飞书)、tg(Telegram)、rl(百度Hi(如流))、workwechat(企业微信应用) `")
    flag.StringVar(&PrometheusAlertUrl, "d", "http://127.0.0.1:8080/zabbix", "`PrometheusAlert的地址`")
    flag.BoolVar(&help, "h", false, "显示帮助")
    flag.Usage = usage
}
func usage() {
    fmt.Fprintf(os.Stderr, `Version 1.4 If you need help contact 244217140@qq.com or visit https://github.com/feiyu563/PrometheusAlert
Usage: zabbixclient [-h] [-t SendTarget] [-m SendMessage] [-type SendType] [-d PrometheusAlertUrl]
Example(发送告警到钉钉)：zabbixclent -t https://oapi.dingtalk.com/robot/send?access_token=xxxxx -m zabbix告警测试 -type dd -d http://127.0.0.1:8080/zabbix

Options:
`)
    flag.PrintDefaults()
}
func main() {
    flag.Parse()
    if help {
       flag.Usage()
       return
    }

    JsonPrometheusAlertMessage := make(map[string]interface{})
    JsonPrometheusAlertMessage["zabbixtarget"] = ZabbixTarget
    JsonPrometheusAlertMessage["zabbixmessage"] = ZabbixMessage
    JsonPrometheusAlertMessage["zabbixtype"] = ZabbixType
    PostMessage, err := json.Marshal(JsonPrometheusAlertMessage)
    if err != nil {
       fmt.Println(err.Error())
       return
    }

    Post(PrometheusAlertUrl, PostMessage)
}

func Post(url string, message []byte) {
    reader := bytes.NewReader(message)
    //reader := strings.NewReader(string(message))
    resp, err := http.Post(url, "application/json", reader)
    if err != nil {
       fmt.Printf("消息发送失败：%s", err)
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
       fmt.Printf("消息发送失败：%s", err)
    }
    fmt.Printf("消息发送完成,服务器返回内容：%s", string(body))
}