Go REST API Boilerplate

This repository is a skeleton for building production ready Golang REST API, with Swagger documentation.

We will use gorilla/mux and go-swagger packages.

Installation

Assuming you have a working Go environment and GOPATH/bin is in your PATH.

Dependencies

Install gorilla/mux:

$ go get github.com/gorilla/mux

Install CORS middleware rs/cors:

$ go get github.com/rs/cors

Live reload

gin is a simple command line utility for live-reloading Go web applications. Just run gin in your app directory and your web app will be served with gin as a proxy. gin will automatically recompile your code when it detects a change. Your app will be restarted the next time it receives an HTTP request.

gin adheres to the "silence is golden" principle, so it will only complain if there was a compiler error or if you succesfully compile after an error.

gin is a breeze to install:

$ go get github.com/codegangsta/gin

Then verify that gin was installed correctly:

$ gin -h

Start gin proxy to listen on port 3000 and send request to proxied app listening on port 8000:

$ cd cmd/app
$ gin run -p 3000 -a 8000 main.go

Then verify that gin act correctly as a proxy to the api:

$ curl -X GET "http://localhost:3000/v1/people" -H "accept: application/json"

Swagger

See the go-swagger page for full installation instructions.

go-swagger releases are distributed as binaries that are built from signed tags. It is published as github release, rpm, deb and docker image.

Debian

$ echo "deb https://dl.bintray.com/go-swagger/goswagger-debian ubuntu main" | sudo tee -a /etc/apt/sources.list

Homebrew

$ brew tap go-swagger/go-swagger
$ brew install go-swagger

Generate swagger

$ swagger generate spec -o swagger-api/v1/swagger.json && swagger validate swagger-api/v1/swagger.json

Serve swagger documentation

Swagger Flavor

$ swagger serve --flavor=swagger --port=6060 swagger-api/v1/swagger.json

This command will open your browser on the URL petstore.swagger.io (the official swagger live-demo exploration tool). This server allow you to explore any swagger json file.

You can host your own swagger-ui server too: https://swagger.io/docs/swagger-tools/#download-33

Redoc flavor

$ swagger serve --flavor=redoc --port=6060 swagger-api/v1/swagger.json

This command will open your browser on the URL localhost:6060/docs, no need of an internet connexion to use it.

REST API

Content of the package

├── main.go
├── router
│   ├── logger.go
│   ├── routes.go
│   └── router.go
├── db
│   └── people.go
├── handlers
│   ├── people.go
│   └── response.go
├── model
│   └── people.go
└── swagger-api
    └── v1
        └── swagger.json

main.go

router

handlers

db

models

swagger-api/v1

References

The following references helped me :

• https://github.com/gorilla/mux
• https://github.com/rs/cors
• http://www.gorillatoolkit.org/pkg/mux
• https://goswagger.io/
• https://github.com/kkamdooong/go-restful-api-example
• https://thenewstack.io/make-a-restful-json-api-go/
• https://github.com/corylanou/tns-restful-json-api

Todo

• Error handling for any system call
• Add correct Content-type headers
• Handle correctly Accept headers
• Handle concurrency
• Add pagination for collections/models getters
•  Http StatusCode handling with consistent http codes implementation
• Versionning with version.go or local json file (pathPrefix)
• Full swagger documentation
• Aggregate multiple miroservices API in a single Swagger end point
• Authentication
• Handle eTags
• Add environment variable such as listening port
• Production ready logs
• Unitary and system Tests
• Rate limit
• gRPC example/version