如何使用 gin 作为服务器编写 prometheus 导出器指标

如何解决如何使用 gin 作为服务器编写 prometheus 导出器指标

这是prometheus官方golang-client示例：

package main

import (
    "log"
    "net/http"

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

var cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
        Name: "cpu_temperature_celsius",Help: "Current temperature of the CPU.",})


func init() {
    // Metrics have to be registered to be exposed:
    prometheus.MustRegister(cpuTemp)
}

func main() {
    cpuTemp.Set(65.3)

    // The Handler function provides a default handler to expose metrics
    // via an HTTP server. "/metrics" is the usual endpoint for that.
    http.Handle("/metrics",promhttp.Handler())
    log.Fatal(http.ListenAndServe(":8080",nil))
}

在此代码中，http 服务器使用 promhttp 库。

如何在使用 gin 框架时修改指标处理程序？我在 documentation 中没有找到答案。

解决方法

我们只使用 promhttp 处理程序。

package main

import (
    "github.com/gin-gonic/gin"
    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/promhttp"
)

var cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
    Name: "cpu_temperature_celsius",Help: "Current temperature of the CPU.",})

func init() {
    prometheus.MustRegister(cpuTemp)
}

func prometheusHandler() gin.HandlerFunc {
    h := promhttp.Handler()

    return func(c *gin.Context) {
        h.ServeHTTP(c.Writer,c.Request)
    }
}

func main() {
    cpuTemp.Set(65.3)

    r := gin.New()

    r.GET("/",func(c *gin.Context) {
        c.JSON(200,"Hello world!")
    })

    r.GET("/metrics",prometheusHandler())

    r.Run()
}

或者我们总是可以切换到 Prometheus 中间件 - https://github.com/zsais/go-gin-prometheus

,

我将 prometheus 与其他库 https://github.com/Depado/ginprom 一起使用：

package main

import (
    "github.com/Depado/ginprom"
    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    p := ginprom.New(
        ginprom.Engine(r),ginprom.Subsystem("gin"),ginprom.Path("/metrics"),)
    r.Use(p.Instrument())

    r.GET("/hello/:id",func(c *gin.Context) {})
    r.GET("/world/:id",func(c *gin.Context) {})
    r.Run("127.0.0.1:8080")
}