Prometheus

Enable Prometheus middleware

Install

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

Options

options	description	type	default
fiber.middleware.prom.enabled	Enable Prometheus middleware	boolean	false
fiber.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="FiberEntry",instance="lark.local",resCode="200",restMethod="GET",restPath="/v1/greeter",quantile="0.5"} 88645
...
rk_prom_resCode{domain="*",entryName="greeter",entryType="FiberEntry",instance="lark.local",resCode="200",restMethod="GET",restPath="/v1/greeter"} 1

Quick start

1.Create boot.yaml

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

2.Create main.go

// Copyright (c) 2021 rookie-ninja
//
// Use of this source code is governed by an Apache-style
// license that can be found in the LICENSE file.

package main

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

// @title Swagger Example API
// @version 1.0
// @description This is a sample rk-demo server.
// @termsOfService http://swagger.io/terms/

// @securityDefinitions.basic BasicAuth

// @contact.name API Support
// @contact.url http://www.swagger.io/support
// @contact.email support@swagger.io

// @license.name Apache 2.0
// @license.url http://www.apache.org/licenses/LICENSE-2.0.html
func main() {
  // Create a new boot instance.
  boot := rkboot.NewBoot()

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

  // Register handler
  entry := rkfiber.GetFiberEntry("greeter")
  entry.App.Get("/v1/greeter", Greeter)
  // This is required!!!
  entry.RefreshFiberRoutes()

  boot.WaitForShutdownSig(context.TODO())
}

// Greeter handler
// @Summary Greeter
// @Id 1
// @Tags Hello
// @version 1.0
// @Param name query string true "name"
// @produce application/json
// @Success 200 {object} GreeterResponse
// @Router /v1/greeter [get]
func Greeter(ctx *fiber.Ctx) error {
  ctx.Response().SetStatusCode(http.StatusOK)
  return ctx.JSON(&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