Prometheus

Enable Prometheus middleware

Install

go get github.com/rookie-ninja/rk-boot/v2
go get github.com/rookie-ninja/rk-gin/v2

Options

options	description	type	default
gin.middleware.prom.enabled	Enable Prometheus middleware	boolean	false
gin.middleware.prom.ignore	Ignore by path	[]string	[]

Concept

Prometheus middleware will record bellow information

Fields	Type	Description
elapsedNano	Summary	RPC elapsed time in nano
resCode	Counter	Counter of response code

Labels as bellow:

Label	Description
entryName	Entry name
entryType	Entry type
domain	ENV value of DOMAIN, eg: prod
instance	Hostname
restMethod	eg: GET
restPath	eg: /rk/v1/alive
resCode	Response code, eg: 200

Example

rk_prom_elapsedNano{domain="*",entryName="greeter",entryType="GinEntry",instance="lark.local",resCode="200",restMethod="GET",restPath="/v1/greeter",quantile="0.5"} 88645
...
rk_prom_resCode{domain="*",entryName="greeter",entryType="GinEntry",instance="lark.local",resCode="200",restMethod="GET",restPath="/v1/greeter"} 1

Quick start

1.Create boot.yaml

---
gin:
  - name: greeter
    port: 8080
    enabled: true
    prom:
      enabled : true
    middleware:
      prom:
        enabled: true
#        ignore: [""]

2.Create main.go

package main

import (
  "context"
  "fmt"
  "github.com/gin-gonic/gin"
  "github.com/rookie-ninja/rk-boot/v2"
  "github.com/rookie-ninja/rk-gin/v2/boot"
  "net/http"
)

func main() {
  // Create a new boot instance.
  boot := rkboot.NewBoot()

  // Register handler
  entry := rkgin.GetGinEntry("greeter")
  entry.Router.GET("/v1/greeter", Greeter)

  // Bootstrap
  boot.Bootstrap(context.TODO())

  boot.WaitForShutdownSig(context.TODO())
}

func Greeter(ctx *gin.Context) {
  ctx.JSON(http.StatusOK, &GreeterResponse{
    Message: fmt.Sprintf("Hello %s!", ctx.Query("name")),
  })
}

type GreeterResponse struct {
  Message string
}

3.Validate

Send request

$ curl "localhost:8080/v1/greeter?name=rk-dev"
{"Message":"Hello rk-dev!"}

Prometheus client:

http://localhost:8080/metrics

Cheers