Example Golang

Example made with Golang, Gin Framework, GraphQL, Resful, Authenticate with JWT and much more.

A example of bank transaction, made with GOlang, Gin Framework, Restful and GraphQL.

• Endpoints
• Insomnia
• Get Started
• Get Started - without docker
• Run Debug with VScode and DB in docker
• Unity Test and Test Integration
• Step By Step
• Commands
• Technologies
• References

Endpoints

Endpoint	Method	Action
/graphql	POST
/graphiql	GET
/users	GET	Index
/users	POST	Store
/users	PATCH	Update
/users/:id	DELETE	Destroy
/users/:id	GET	Show

Insomnia

If you use Insomnia, just import a insomnia-v4.yaml

Get Started

Just one command

docker-compose up --build

Open on you best browser: http://localhost:8085
GraphQL Playground: http://localhost:8085/gaphiql
To see a database open adminer on: http://localhost:8086
Configurations for connect on database see: /docker/local.env IMPORTANT! If you not have a docker see: Get Started - without docker

Structure

├── config - (configuration)
├── controllers (RESTfull methods)
├── core (Base methos for controllers, models and services)
├── database - (database configuration, migrate and seed data)
├── graphql
│   ├── generated            - A package that only contains the generated runtime
│   │   └── generated.go
│   ├── model                - A package for all your graph models, generated or otherwise
│   │   └── models_gen.go
│   ├── resolver.go          - The root graph resolver type. This file wont get regenerated
│   ├── schema.graphqls      - Some schema. You can split the schema into as many graphql files as you like
│   └── schema.resolvers.go  - the resolver implementation for schema.graphql
├── models (ORM models based on Database tables)
├── routes (files with routes)
├── services (with business rules and intermediate a database)controlling the generated code.
├── go.mod
├── go.sum
├── gqlgen.yml               - The gqlgen config file, knobs for
└── main.go                  - The entry point to your app. Customize it however you see fit

Commands

Enter on docker container to exec any command.

docker exec -it labbankgo-api /bin/bash

To generate graphql files.

gqlgen generate

On docker

~/go/bin/gqlgen generate

Out of docker

Get Started without docker

A Database PostgreSQL is needed, configurations for it in docker/local.env

gin --port=8080 #or ~/go/bin/gin --port=8080

Run Debugg

With VScode and SGBD on Docker

docker-compose -f docker-compose-db.yml up

Open your debug on VScode and run "Launch file"

Unity Test and Test Integration

go test -v ./src/tests/

With code coverage

go test -cover -coverprofile=c.out ./src/tests/
go tool cover -html=c.out -o coverage.html

Step By Step

All steps necessary to make this example project.

Create a mod init

All libs in Golang have a module name. This is for a package manage for Golang, like a npm/yarm for nodeJS, gradlew/mavem for Java, compose for PHP, mix for Elixir and many more.

go mod init github.com/ruyjfs/example-golang

See: go.mod

Create a file main.go - The Hello World

 echo '' >> main.go

package main

import (
	"log"
)

func main() {
	log.Printf("Hello World!")
}

Run to see you first hello world

go run main.go

Install Gin Framework

go get github.com/codegangsta/gin

Update a file main.go with this example code

package main

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

func setupRouter() *gin.Engine {
	r := gin.Default()

	r.GET("/:name", func(c *gin.Context) {
		name := c.Params.ByName("name")
		c.String(http.StatusOK, "Hello World", name)
	})

	return r
}

func main() {
	r := setupRouter()
	r.Run(":8080")
}

Install GraphQL

go run github.com/99designs/gqlgen init

To generate graphql files.

gqlgen generate

On docker

~/go/bin/gqlgen generate

Install GORM

go get -u gorm.io/gorm && \
go get -u gorm.io/driver/postgres

Start project with Hot Reload

~/go/bin/gin

Default start project

go run main.go

Open on you best browser: http://localhost:8085

Run Debugg

With VScode and SGBD on Docker

docker-compose -f docker-compose-db.yml up

Unity Test and Test Integration

go test -v ./src/tests/

With code coverage

go test -cover -coverprofile=c.out ./src/tests/
go tool cover -html=c.out -o coverage.html

Technologies:

• Golang (Language)
• GORM (ORM)
• Gqlgen (GraphQL)
• PostgreSQL (SGBD)
• Docker Compose (Local Environment)

References

• Effective GO
• JsonAPI (Restful API Specification)
• Style Guide - GOlang Code Review
• Style Guide - Google
• Style Guide - Uber GO
• Style Guide - Source Graph
• How to GraphQL with GO
• Examples with GO