编写一个简单的 rtc_exporter

1. 系统交互图

   
   rtc_exporter.png

1）rtc_server 通过写文件的方式将系统和业务数据记录到临时文件
2）rtc_exporter 读取相关配置并上传到 pushgateway

2. 系统使用的是 golang 语言进行编写
   main.go

package main

import (
    "flag"
    "fmt"
    "os"
    "rtc_exporter/common"
    "rtc_exporter/structure"
    "rtc_exporter/utils"
    "time"

    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/push"
)

var (
    confFile = flag.String("c", "./config/config.json", "configuration file,json format")

    rtcData = prometheus.NewGaugeVec(prometheus.GaugeOpts{
        Name:      "rtc_server",
        Namespace: "rtc_server",
        Help:      "rtc server report running manually~",
    }, []string{"server", "key"})
)

//读取程序配置文件
func ReadConfigFile() (string, string, string, float64) {

    common.ProcessOptions()
    if err := common.LoadConfigFromFile(*confFile); err != nil {
        fmt.Println("Load Config File fail,", err)
        return "", "", "", -1
    }
    common.DumpConfigContent()

    // 获取日志配置
    expo_dest, err := common.GetConfigByKey("exporter.dest")
    if err != nil {
        fmt.Println("can not get dest config:", err)
        return "", "", "", -1
    }
    jobname, err := common.GetConfigByKey("exporter.jobname")
    if err != nil {
        fmt.Println("can not get jobname config:", err)
        return "", "", "", -1
    }
    filename, err := common.GetConfigByKey("exporter.filename")
    if err != nil {
        fmt.Println("can not get filename config:", err)
        return "", "", "", -1
    }
    interval, err := common.GetConfigByKey("exporter.interval")
    if err != nil {
        fmt.Println("can not get interval config:", err)
        return "", "", "", -1
    }

    return expo_dest.(string), jobname.(string), filename.(string), interval.(float64)
}

//main函数
func main() {

    var f func()
    var t *time.Timer

    expo_dest, jobname, filename, interval := ReadConfigFile()

    f = func() {
        var info structure.BasicInfo
        info, err := utils.ReadLineJson(filename, utils.ProcessLine)
        if err != nil {
            fmt.Println("Info error!")
        } else {
            registry := prometheus.NewRegistry()
            registry.MustRegister(rtcData)
            pusher := push.New(expo_dest, jobname).Gatherer(registry)

            rtcData.WithLabelValues(info.Server, "user").Set((float64)(info.Data.User))
            rtcData.WithLabelValues(info.Server, "qps").Set((float64)(info.Data.Qps))

            if err := pusher.Add(); err != nil {
                fmt.Println("Could not push to Pushgateway:", err)
                os.Exit(-1)
            }

            fmt.Println("success")
        }
        t = time.AfterFunc(time.Duration(interval)*time.Second, f)
    }

    t = time.AfterFunc(time.Duration(interval)*time.Second, f)

    defer t.Stop()
    time.Sleep(time.Minute)
}

因为是Beta版，只实现基本功能，后续会持续优化

3. 实现功能：
   1）读取临时文件（json格式）
   2）读取配置文件信息（包括上报地址、间隔时间等）
   3）定时发送信息到 pushgateway

4. 后续可优化的点
   1）改造成直接与 prometheus 交互的版本
   2）实现自身的高可用，守护进程等方式
   3）代码整合结构化...