Sample Golang API Server

Sample REST API build using echo server.

The code implementation was inspired by port and adapter pattern or known as hexagonal:

• Business
  Contains all the logic in domain business. Also called this as a service. All the interface of repository needed and the implementation of the service itself will be put here.
• Modules
  Contains implementation of interfaces that defined at the business (also called as server-side adapters in hexagonal's term)
• API
  API http handler or controller (also called user-side adapters in hexagonal's term)

In this example, we just introduce two database MongoDB and MySQL as an adapters to illustrate how business side is become independent and not affected when we change the adapters.

Data initialization

To describe about how port and adapter interaction (separation concerned), this example will have two databases supported. There are MySQL and MongoDB.

MongoDB will become a default databaese in this example. If you want to change into MySQL, update the configuration inside config.yaml file.

MongoDB

Please execute script below to create a new collection called items including the index needed

db.createCollection('items');
db.items.createIndex({"tags": 1});
db.items.createIndex({"modified_at": 1, "_id": 1});

MySQL

Please execute script below to create item and item_tag table in your database

CREATE TABLE `item` (
  `id` varchar(24) NOT NULL DEFAULT '',
  `name` text NOT NULL,
  `description` text NOT NULL,
  `created_at` datetime NOT NULL,
  `created_by` varchar(50) NOT NULL DEFAULT '',
  `modified_at` datetime NOT NULL,
  `modified_by` varchar(50) NOT NULL DEFAULT '',
  `version` int(11) NOT NULL DEFAULT '1',
  PRIMARY KEY (`id`),
  KEY `modified_at` (`modified_at`,`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `item_tag` (
  `item_id` varchar(24) NOT NULL DEFAULT '',
  `tag` varchar(50) NOT NULL DEFAULT '',
  PRIMARY KEY (`item_id`,`tag`),
  KEY `tag` (`tag`),
  CONSTRAINT `item_tag_ibfk_1` FOREIGN KEY (`item_id`) REFERENCES `item` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

How To Run Server

Just execute code below in your console

./run.sh

How To Consume The API

There are 4 availables API that ready to use:

• GET /v1/items/:id
• GET /v1/items/[tag-name]
• POST /v1/items
• PUT /v1/items

To make it easier please download Insomnia Core app and import this collection.