A Beego Golang Framework on top of Openshift 4

Golang has a lot of web frameworks and Beego is one it, it provides a rapid development of enterprise application in Go, including RESTful APIs, web apps and backend services.

The concept for this is pretty much simple, a json rest api showing helo world as response. Deployed as containerized image, on top of Kubernetes. So lets start with some Go files,

package main

import (
	_ "HelloBeego/routers"
	"github.com/beego/beego/v2/server/web"
)

func main() {
	web.Run()
}

A router file,

package routers

import (
	"HelloBeego/controllers"
	"github.com/beego/beego/v2/server/web"
)

func init() {
	web.Router("/", &controllers.HelloController{})
}

and a controller,

package controllers

import "github.com/beego/beego/v2/server/web"

type HelloController struct {
	web.Controller
}

type helloResponse struct {
	Greeting string `json:"greeting"`
}

func (u *HelloController) Get() {

	user := helloResponse{}
	user.Greeting = "Hello World Edwin"

	u.Data["json"] = user
	u.ServeJSON()
}

The tricky part is creating a multi-stage build by using Docker to build this and deploy by using a different images.

FROM registry.access.redhat.com/ubi8/go-toolset
USER root
RUN mkdir /build/
ADD . /build/
RUN cd /build/  go build

FROM registry.access.redhat.com/ubi8/ubi-minimal
COPY --from=0 /build/HelloBeego /usr/local/bin/app
CMD app
EXPOSE 8080

Run docker build command, deploy the containerized image into Openshift 4 and create Routes in order to make the application accessible. The sample commands are in below,

$ oc new-app . --strategy=docker

$ oc create route edge --service=beego-rest-hello-world

Code can be accessed in below Github repo,

https://github.com/edwin/beego-rest-hello-world