Go-book-store-api

Go Sample project to understand Mysql CRUD operation with best practises

A production ready sample Book store RESTful API with Go using gorilla/mux uber/Zap lumberjack with Mysql (A nice relational Database), JWT Authentication. This Project contains a golang implementation of Swagger 2.0 (aka OpenAPI 2.0): it knows how to serialize and deserialize swagger specifications.

Installation & Run

# Download this project
git clone github.com/err-him/go-book-store-api

Before running API server, you should set the database config with yours or set the your database config with my values on db/evv.local.json

{
  "host"   :  "127.0.0.1",
	"port"   :  "3306",
	"uname"  :  "root",
	"dbname" :  "book_store",
	"pass"   :  "root"
}

Run via Docker

Requirements

Step 1: Create the Docker image according to Dockerfile. Ensure docker-compose is installed on your build system. For details on how to do this, see: https://docs.docker.com/compose/install/

# This may take a few minutes.
$ docker-compose up -d

This will create two containers in background for Go and Mysql respectively

Step 2:. The above process will create two separate container and DB for application, to auto populate some data in DB run

$ cat db.sql | docker exec -i full_db_mysql /usr/bin/mysql -u root --password=root book_store

Step 3: Open another terminal and access the example API endpoint.

$ curl http://localhost:9002/health
{"status": "up" }

Important Note: While setting up the docker change the DB host from 127.0.0.1 to book-store-mysql because while creating the docker Image we are proving host name book-store-mysql else use 127.0.0.1 if running using go run or make run

Routing

gorilla/mux is being used to setup for routing. It provides some powerful feature like grouping/middleware/handler etc.

  v1 := r.PathPrefix("/api/v1").Subrouter()

	v1.HandleFunc("/genre/create", genreHandler.CreateGenre).Methods(http.MethodPost)
	v1.HandleFunc("/genre/update", genreHandler.UpdateGenre).Methods(http.MethodPut)
	v1.HandleFunc("/genre/get/all", genreHandler.GetAll).Methods(http.MethodGet)
	v1.HandleFunc("/genre/get/{id}", genreHandler.GetOne).Methods(http.MethodGet)
	v1.HandleFunc("/genre/delete/{id}", genreHandler.Delete).Methods(http.MethodDelete)

DB

Mysql is being used as database database/sql and github.com/go-sql-driver/mysql module to create and manage database connection

Build

# Build and Run
cd go-book-store-api
make build

Run

# Build and Run
cd go-book-store-api
make APP_ENV="local" run

# API Endpoint : http://127.0.0.1:9002

Structure

main.go -> Entry point of application
config -> folder to store all connection and routing related logic

  config/app.go -> app run/db connection and routing Initialize
  config/routes.go -> app routing defined here
  config/driver/db.go -> mysql connection established Here
  config/properties -> all application properties in JSON form stored Here, to read config file **https://github.com/err-him/gonf** package used

logger -> Folder contains application logging logic
    logger/zap.go -> This contains the logger implementation logic. To implement **uber/zap** logger with **lumberjack** a log rolling package **https://github.com/err-him/gozap** package is being used

api  -> Api package is used to receive an incoming request, validate the request for any bad input parameters. Generate a proper     response after running our business logic.

    api/constants  ->   contains all application related constants like http etc
    api/controllers ->  Contains handler functions for particular route to be called when an api is called.
    api/models ->   database tables to be used as models struct and interface provided for the repositories
    api/handler ->      basically contains the helper functions used in returning api responses, HTTP status codes, default messages etc.
    api/repositories ->   repository package is a wrapper on database and cache, so no other package can directly access the database. This package handle all create, update, fetch and delete operation on database tables or cache.
    api/utils ->    contains all application utility function.

db.sql -> file contains db schema and data information, dumped data from mysql
          command for dump database => `mysqldump -u root -p book_store > /Users/himanshu/go-learning/book-store-api/db.sql`

swagger.yml -> swagger API documentation configuration          

OpenAPI & Swagger - API DOCUMENTATION

Introduction to OpenAPI & Swagger Open Source Tools

OpenAPI & Swagger

OpenAPI

OpenAPI Specification (formerly Swagger Specification) is an API description format for REST APIs. An OpenAPI file allows you to describe your entire API, including:

• Available endpoints (/users) and operations on each endpoint (GET /users, POST /users)
• Operation parameters Input and output for each operation
• Authentication methods
• Contact information, license, terms of use and other information.

API specifications can be written in YAML or JSON. The format is easy to learn and readable to both humans and machines. The complete OpenAPI Specification can be found on GitHub: OpenAPI 2.0 Specification, OpenAPI 3.0 Specification

Swagger

Swagger is a set of open-source tools built around the OpenAPI Specification that can help you design, build, document and consume REST APIs. The major Swagger tools include: Swagger allows you to describe the structure of your APIs so that machines can read them. The ability of APIs to describe their own structure is the root of all awesomeness in Swagger.

• Swagger Editor – browser-based editor where you can write OpenAPI specs.
• Swagger Codegen – generates server stubs and client libraries from an OpenAPI spec.
• Swagger UI – renders OpenAPI specs as interactive API documentation.

Introduction to OpenAPI Specification

Basic Structure

Swagger can be written in JSON or YAML. In this guide, we only use YAML examples, but JSON works equally well. A sample Swagger specification written in YAML looks like:

swagger: "2.0"
info:
  title: Sample API
  description: API description in Markdown.
  version: 1.0.0
host: api.example.com
basePath: /v1
schemes:
  - https
paths:
  /users:
    get:
      summary: Returns a list of users.
      description: Optional extended description in Markdown.
      produces:
        - application/json
      responses:
        200:
          description: OK

Quick Start Swagger

This Project contains a golang implementation of Swagger 2.0 (aka OpenAPI 2.0): it knows how to serialize and deserialize swagger specifications.

go-swagger brings to the go community a complete suite of fully-featured, high-performance, API components to work with a Swagger API

Installation Go Swagger To install Go SWAGGER in Mac, type following command

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

Once Installation complete go to project repo and generate swagger documentation by following command

swagger serve -F=swagger ./swagger.yml

Also created nice Makefile for the same, to run via make enter: make serve-swagger

** Swagger UI**

Quick Start Swagger

This Project contains a golang implementation of Swagger 2.0 (aka OpenAPI 2.0): it knows how to serialize and deserialize swagger specifications.

go-swagger brings to the go community a complete suite of fully-featured, high-performance, API components to work with a Swagger API

Installation Go Swagger To install Go SWAGGER in Mac, type following command

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

Once Installation complete go to project repo and generate swagger documentation by following command

swagger serve -F=swagger ./swagger.yml

Also created nice Makefile for the same, to run via make enter: make serve-swagger

** Swagger UI**

API

/genre

• /create POST : Create Genre
• /update PUT : update Genre
• /get/all GET : Get all active Genre
• get/{:id} GET : Get One genre - specified by Id or Genre slug
• delete/{:id} DELETE : delete genre - Soft delete by specified id or slug

/publishers

• /create POST : Create Publisher
• /update PUT : update Publisher
• /get/all GET : Get all active Publisher
• get/{:id} GET : Get One Publisher - specified by Id or Genre slug
• delete/{:id} DELETE : delete Publisher - Soft delete by specified id or slug

/author

• /create POST : Create Author
• /update PUT : update Author
• /get/all GET : Get all active Author
• get/{:id} GET : Get One Author - specified by Id or Genre slug
• delete/{:id} DELETE : delete Author - Soft delete by specified id or slug

/books

• /create POST : Create Book
• /update PUT : update Book
• /get/all GET : Get all Books
• get/{:id} GET : Get One Book - specified by Id
• delete/{:id} DELETE : delete Book - Soft delete by Id
• search?q={:query} GET : Search book - by its Name

/users

• /create POST : Create User
• /verify PUT : Verify Book

Todo

• [√] Support basic REST APIs.
• [√] Support Authentication with user for securing the APIs.
• [√] Make convenient wrappers for creating API handlers.
• Write the tests for all APIs.
• [√] Organize the code with packages
• [√] Add logging to application
• Add zipkin for tracing
• [√