监控数据库字段 钉钉报警

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    _ "github.com/go-sql-driver/MySQL"
    "github.com/go-xorm/xorm"
    "io/ioutil"
    "net/http"
    "time"
)

var engine *xorm.Engine

const webhook_url = "https://oapi.dingtalk.com/robot/send?access_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

func dingtoinfo(s string) bool {
    content, data := make(map[string]string), make(map[string]interface{})
    content["content"] = s
    data["msgtype"] = "text"
    data["text"] = content
    b, _ := json.Marshal(data)

    resp, err := http.Post(webhook_url,
        "application/json",
        bytes.NewBuffer(b))
    if err != nil {
        fmt.Println(err)
    }
    defer resp.Body.Close()
    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
    return true
}
func recoverName() {
    if r := recover(); r != nil {
        res := fmt.Sprintf("%s %s", "监控程序 报错:", r)
        dingtoinfo(res)
    }
}

func main() {
    defer recoverName()
    var err error
    engine, err = xorm.NewEngine("mysql", "root:xxxxxxxxxxxxxxx@tcp(127.0.0.1:3306)/new?charset=utf8")

    if err != nil {
        panic(err.Error())
    }
    gsql := " select up_time from token where type = 0 ;"
    gres, gerr := engine.Query(gsql)

    if gerr != nil {
        panic(gerr.Error())
    }
    var data string
    for _, v := range gres {
        data = string(v["up_time"])
    }
    loc, _ := time.LoadLocation("Asia/Shanghai")
    nowTime := time.Now().In(loc)

    tm, _ := time.Parse("2006-01-02 03:04:05", data)
    ntm := tm.In(loc)
    subM := nowTime.Sub(ntm)
    fmt.Println("token更新时间 与 系统时间 相差",subM)
    subtract := int(subM.Minutes())
    if subtract > 20 {
        dingtoinfo("异常, 请及时登录查看 !!!")
    }
}

当前题目：年轻人的第一个go程序:监控数据库字段报警
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