package main

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

func main() {
    r := gin.Default()
    // use prometheus metrics exporter middleware.
    //
    // ginprom.PromMiddleware() expects a ginprom.PromOpts{} pointer.
    // It is used for filtering labels by regex. `nil` will pass every requests.
    //
    // ginprom prometheus-labels: 
    //   `status`, `endpoint`, `method`
    //
    // for example:
    // 1). I don't want to record the 404 status request. That's easy for it.
    // ginprom.PromMiddleware(&ginprom.PromOpts{ExcludeRegexStatus: "404"})
    //
    // 2). And I wish to ignore endpoints started with `/prefix`.
    // ginprom.PromMiddleware(&ginprom.PromOpts{ExcludeRegexEndpoint: "^/prefix"})
    r.Use(ginprom.PromMiddleware(nil))

    // register the `/metrics` route.
    r.GET("/metrics", ginprom.PromHandler(promhttp.Handler()))

    // your working routes
    r.GET("/", func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{"message": "home"})
     })
}