User management RESTful API

I created a simple RESTful API in Go for user-management which runs on 18080 port in this project. I connected this application to the MariaDB cluster, which sat up in this link. I make a docker image for it and push it to docker hub. And at the end, I configure GitLab CI/CD for it.

This application stores new users and their phone numbers.

controllers
In usercontroller.go, I have defined four handlers :
 1- GetAllUsers: retrieve the records of all the users
 2- DeletUserByID: delete specific user by ID
 3- CreateUser: create a new user
 4- UpdateUserByID: update a users’s record information

I use the gorilla/mux package to implement a request router and dispatcher for matching incoming requests to their respective handler.

database connection
For connecting this app to the database, there are two files:
  1- config.go:
    I defined the config structure in this file, and whit the GetConnectionString function, the connectionString was created.

  2- connector.go:
   For connecting to database i use gorm which is an ORM library for Golang.
   GORM provides CRUD operations and can also be used for the initial migration and creation of the database schema.
   in this file i define two functions :

• Connect: its open connection to the mysql service.
• Migration: this function use gorm AutoMigrate function to automaticly create table.

    I leran about ORM technique from blow:
     Introduction to Object-Relational Mapping

entity
In this folder is a user.go file which contains and User object for REST(CRUD).

main
In main file three functions are defined:

• initDb: it loads .env file to get database config and after that called all functions which are used to connect ro database and create table
• initaliseHandlers: in this function we have four routes which are maped to their related handler.
• main: called initDb and initaliseHandlers functions and create router.

Preparing GitLab CI/CD

 I just write some bash scripts, define all the automated tasks in a .gitlab-ci.yml file in the root of the repo, and with a few more small configuration steps.Three stages are defined in the CI/CD :

• test: it is an simple automated testing of the Golang code.
• build: just build the docker image and push it to dockerhub.
• deploy: releasing an app to production.