Ilham S
Posted on June 9, 2021
Food App Backend Golang with Domain Driven Design
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Please kindly visit this repo for the complete source code :Link
List of libraries we will be using :
- Viper Link
- Gin Web Framework Link
- Go ORM / GORM Link
- Go JWT Implementation Link
- Go MySQL driver Link
- Go Email validation Link
- Bcrpyt hashing Link
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First thing first
Let's start by initiating dependency management in Go using go.mod, execute in root project
Path: food-app/
go mod init food-app
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Folder Organization
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Pkg layer
Environment config
We use MySQL database, the connection configuration will be written in file App.yaml folder configurations
Please adjust the config to fit your local database
Then, inside pkg folder , we make package config to read the configuration from App.yaml . We use viper library to read local config file App.yaml
Path: food-app/pkg/config
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Database connection
We will define the database connection package in the database.go file, it contains a function to initiate a MySQL database connection with the configuration we took from viper earlier.
Path: food-app/pkg/database
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Token management
In this application we will use jwt-token to store individual information, verification, and validation
The jwttoken package we define in the token.go file, contains functions to create a jwttoken, extract the contents of the information stored in the jwttoken, and also validate the jwttoken sent from the client.
Path: food-app/pgk/jwttoken
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Password management
In this application, the user password will be stored in the database in the form of hash data or the implementation of Provos and Mazières bcrypt adaptive hashing algorithm. Link
File hash.go
Path: food-app/pkg/security
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Response custom
This custom Response Package will handle returning data according to certain needs and conditions
File response.go
Path: food-app/pkg/response
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Domain Layer
At this layer start to enter the business logic of this application
Entity
We will function the Entity package as a blueprint for the domain, where we put the schema and struct model for food and users
File: food.go
Path: food-app/internal/domain/entity
File: user.go
Path: food-app/internal/domain/entity
Pay attention to the user entity, we have implemented a security package for user password encryption
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Repository
The Package Repository will function as a place to define a collection of methods, which will later interact with databases, services, and other API integrations
File: food_repository.go
Path: food-app/internal/domain/repository
File: user_repository.go
Path: food-app/internal/domain/repository
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Service
The Package Service will serve as the place where we implement the methods defined in the repository
File: food_service.go
Path: food-app/internal/domain/service
File: user_service.go
Path: food-app/internal/domain/service
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Handler
The Package Handler here is where we handle HTTP requests and responses. The entry point for user-related services, and food-related services
File: food_handler.go
Path: food-app/internal/domain/handler
File: user_handler.go
Path: food-app/internal/domain/handler
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API Layer
Middleware
Package Middleware here functions as an in-between process for us to pass requests from authenticated users and restrict/hold access from unauthenticated users. Here we also define CORS middleware Link so that users can access data from different domains
File: middleware.go
Path: food-app/api/middleware
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Router
In this Router package we will define our API routes, and mapping the response, also include the middleware earlier
File : router.go
Path : food-app/api
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Migration
In this application, we have given ddl for the MySQL client to initiate the tables that we are using, please access the food-app.sql file, at the path: food-app/migration
Run the command in it on your local MySQL database client
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Main.go
In this main package, we will initiate the environment config and open a connection to the database, after success, the application will run locally on the port we specified in the environment.
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Run application
Make sure your database has been created with dbname according to the environment, the tables have been formed after running the sql command in the migration folder, to run this application do the following command
go mod init
go get
go run main.go
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That is all and thank you
Good luck
Credits and Insights
Posted on June 9, 2021
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