UGin - Ultimate Gin API

UGin is an API boilerplate written in Go (Golang) with Gin Framework. https://github.com/gin-gonic/gin

Database Support

UGin uses gorm as an ORM. So Sqlite3, MySQL and PostgreSQL is supported. You just need to edit config.yml file according to your setup.

config.yml content:

database:
  driver: "postgres"
  dbname: "ugin"
  username: "user"
  password: "password"
  host: "localhost"
  port: "5432"

Default Models

UGin has two models (Post and Tag) as boilerplate to show relational database usage.

/model/post-model.go content:

type Post struct {
	gorm.Model
	Name        string `json:"Name" gorm:"type:varchar(255)"`
	Description string `json:"Description"  gorm:"type:text"`
	Tags        []Tag  // One-To-Many relationship (has many - use Tag's UserID as foreign key)
}

type Tag struct {
	gorm.Model
	PostID      uint   `gorm:"index"` // Foreign key (belongs to)
	Name        string `json:"Name" gorm:"type:varchar(255)"`
	Description string `json:"Description" gorm:"type:text"`
}

Filtering, Search and Pagination

UGin has it's own filtering, search and pagination system. You just need to use these parameters.

Query parameters:

/posts/?Limit=2
/posts/?Offset=0
/posts/?Sort=ID
/posts/?Order=DESC
/posts/?Search=hello

Full: http://localhost:8081/posts/?Limit=25&Offset=0&Sort=ID&Order=DESC&Search=hello

Running

To run UGin with Docker, firstly build an image:

make build-image

To run Ugin with MySQL:

make run-app-mysql

To run Ugin with PostgreSQL:

make run-app-postgres

Application will be served at ":8081"

Logging

UGin has a very powerful logging logic. There is application log (ugin.log), database log (ugin.db.log) and access log (ugin.access.log)

ugin.log:

INFO 2021-09-19T00:33:32+03:00 Server is starting at 127.0.0.1:8081
ERROR 2021-09-19T00:39:19+03:00 Failed to open log file ugin.log

ugin.db.log:

2021/09/19 00:33:32 /home/user/projects/ugin/pkg/database/database.go:76
[0.023ms] [rows:-] SELECT * FROM `posts` LIMIT 1

2021/09/19 00:33:32 /home/user/go/pkg/mod/gorm.io/driver/[email protected]/migrator.go:261
[0.015ms] [rows:-] SELECT count(*) FROM sqlite_master WHERE type = "index" AND tbl_name = "posts" AND name = "idx_posts_deleted_at"

2021/09/19 00:33:32 /home/user/go/pkg/mod/gorm.io/driver/[email protected]/migrator.go:32
[0.010ms] [rows:-] SELECT count(*) FROM sqlite_master WHERE type='table' AND name="tags"

2021/09/19 00:33:32 /home/user/projects/ugin/pkg/database/database.go:76
[0.011ms] [rows:-] SELECT * FROM `tags` LIMIT 1

ugin.access.log:

[GIN] 2021/09/19 - 00:33:43 | 200 |    9.255625ms |       127.0.0.1 | GET      "/posts/"
[GIN] 2021/09/19 - 00:41:51 | 200 |     6.41675ms |       127.0.0.1 | GET      "/posts/4"

Routes

Default UGin routes are listed below.

METHOD	ROUTE	FUNCTION
GET	/posts/	github.com/yakuter/ugin/controller.(*Controller).GetPosts
GET	/posts/:id	github.com/yakuter/ugin/controller.(*Controller).GetPost
POST	/posts/	github.com/yakuter/ugin/controller.(*Controller).CreatePost
PUT	/posts/:id	github.com/yakuter/ugin/controller.(*Controller).UpdatePost
DELETE	/posts/:id	github.com/yakuter/ugin/controller.(*Controller).DeletePost
GET	/postsjwt/	github.com/yakuter/ugin/controller.(*Controller).GetPosts
GET	/postsjwt/:id	github.com/yakuter/ugin/controller.(*Controller).GetPost
POST	/postsjwt/	github.com/yakuter/ugin/controller.(*Controller).CreatePost
PUT	/postsjwt/:id	github.com/yakuter/ugin/controller.(*Controller).UpdatePost
DELETE	/postsjwt/:id	github.com/yakuter/ugin/controller.(*Controller).DeletePost
POST	/auth/signup	github.com/yakuter/ugin/controller.(*Controller).Signup
POST	/auth/signin	github.com/yakuter/ugin/controller.(*Controller).Signin
POST	/auth/refresh	github.com/yakuter/ugin/controller.(*Controller).RefreshToken
POST	/auth/check	github.com/yakuter/ugin/controller.(*Controller).CheckToken
GET	/admin/dashboard	github.com/yakuter/ugin/controller.Dashboard

Gin Running Mode

Gin framework listens GIN_MODE environment variable to set running mode. This mode enables/disables access log. Just run one of these commands before running UGin:

// Debug mod
export GIN_MODE=debug
// Test mod
export GIN_MODE=test
// Release mod
export GIN_MODE=release

Packages

UGin uses great open source projects list below: Gin for main framework, Gorm for database and Viper for configuration.

go get -u github.com/gin-gonic/gin
go get -u github.com/jinzhu/gorm
go get -u github.com/jinzhu/gorm/dialects/postgres
go get -u github.com/jinzhu/gorm/dialects/sqlite
go get -u github.com/jinzhu/gorm/dialects/mysql
go get -u github.com/spf13/viper

Middlewares

1. Logger and Recovery Middlewares

Gin has 2 important built-in middlewares: Logger and Recovery. UGin calls these two in default.

router := gin.Default()

This is same with the following lines.

router := gin.New()
router.Use(gin.Logger())
router.Use(gin.Recovery())

2. CORS Middleware

CORS is important for API's and UGin has it's own CORS middleware in include/middleware.go. CORS middleware is called with the code below.

router.Use(include.CORS())

There is also a good repo for this: https://github.com/gin-contrib/cors

3. BasicAuth Middleware

Almost every API needs a protected area. Gin has BasicAuth middleware for protecting routes. Basic Auth is an authorization type that requires a verified username and password to access a data resource. In UGin, you can find an example for a basic auth. To access these protected routes, you need to add Basic Authorization credentials in your requests. If you try to reach these endpoints from browser, you should see a window prompting you for username and password.

authorized := router.Group("/admin", gin.BasicAuth(gin.Accounts{
    "username": "password",
}))

// /admin/dashboard endpoint is now protected
authorized.GET("/dashboard", controller.Dashboard)

What is next?

• Ugin needs a user service and an authentication method with JWT.