lucasvmiguel / products-api

Products API is a REST API written in Typescript where products can be created, read, updated and deleted.

Products API

Description

Products API is a REST API written in Typescript where products can be created, read, updated and deleted.

Note: This API has been configured for development environment. To use in a production environment, further setup will be required.

Installing the app

Requirements:

• Node
• Docker
• Docker Compose

git clone [e-mail]:lucasvmiguel/products-api.git
cd products-api
npm install

Running the app

1. Open a terminal and run the following command to start the persistence (database) required:

npm run persistence:up

2. In another terminal, start the application with the following command:

npm run dev

Note: The graphql schema is not reloaded if there is any changes. You must restart the server to pick up the new changes.

Testing

Unit test

npm run test:unit

Integration test

npm run test:integration

Stress test

Requirements:

• Apache AB

1. Open a terminal and run the following command to start the persistence (database) required:

npm run persistence:up

2. In a new terminal, start the application with the following command:

npm run build && npm start

3. In another terminal, run the stress test with the following command

npm run test:stress

Configuration

• To configure how the app will run, check the following file: .env

Architecture

This section describes what are the goals of the system and some of its design and implementation.

Requirements

The following list shows all user requirements implemented by the system.

• As a user, I can fetch all products using a REST API.
• As a user, I can fetch a paginated list of products using a REST API.
• As a user, I can fetch a product by its id using a REST API.
• As a user, I can create a product using a REST API.
• As a user, I can update some fields (name and/or code) of a product by its id using a REST API.
• As a user, I can delete a product by its id using a REST API.

Schema

The following picture shows all the entities of the system.

System Design

The following pictures shows some of the details of how the system is designed and implemented.

Folder/File structure

• /src: Application source code
• /test: All sort of tests. (eg: unit, integration, stress)
• .env and /src/config.ts: Configures the application
• /src/controllers: Responsible for handling HTTP requests
• /src/middlewares: Application middlewares (eg: logging, authentication, etc)
• /src/services: Business logic layer for the application
• /src/resolvers: Responsible for handling GraphQL queries
• /src/utils: Utilities and helpers to create the application
• /src/routes.ts: HTTP routes to access the API
• /src/app.ts: Configures the application to start
• /src/index.ts: Application start file
• /.github: CI/CD from Github
• docker-compose.yml: Used to spin up the persistence layer in development and testing
• package.json: Project's executable tasks

Inspired by: https://blog.logrocket.com/organizing-express-js-project-structure-better-productivity/

Stack

• Language: Node
• API/REST framework: Express
• Database ORM: Prisma
• Config reader: dotenv
• Database: Postgres

API Docs

This section is described the REST API's endpoints (URL, request, response, etc).

Create product

Endpoint that creates a product

Request

Endpoint: [POST] /api/v1/products

Headers:
  Content-Type: application/json

Body:
  {
    "name": "Product name",
    "stock_quantity": 10
  }

Response

Success

Status: 201

Body:
  {
    "id": 1,
    "name": "Product name",
    "code": "70a17d32-a670-4396-9706-bd0940152fc7",
    "stock_quantity": 10,
    "created_at": "2022-07-08T18:53:57.936433+01:00",
    "updated_at": "2022-07-08T18:53:57.936433+01:00"
  }

Bad Request

Status: 400

Internal Server Error

Status: 500

Get products paginated

Endpoint to get products paginated

Request

Query Parameters

• cursor: use the response's next_cursor field
• limit: limit of products to be returned (min=1, max=100)

Endpoint: [GET] /api/v1/products?limit=10&cursor=2

Headers:
  Content-Type: application/json

Response

Success

Status: 200

Body:
  {
    "items": [
      {
        "id": 1,
        "name": "foo",
        "code": "70a17d32-a670-4396-9706-bd0940152fc7",
        "stock_quantity": 1,
        "created_at": "2022-07-08T18:53:57.936433+01:00",
        "updated_at": "2022-07-08T18:53:57.936433+01:00"
      }
    ],
    "next_cursor": 2
  }

Internal Server Error

Status: 500

Get all products

Endpoint to get all products (does not have pagination)

Request

Endpoint: [GET] /api/v1/products/all

Headers:
  Content-Type: application/json

Response

Success

Status: 200

Body:
  [
    {
      "id": 1,
      "name": "foo",
      "code": "70a17d32-a670-4396-9706-bd0940152fc7",
      "stock_quantity": 1,
      "created_at": "2022-07-08T18:53:57.936433+01:00",
      "updated_at": "2022-07-08T18:53:57.936433+01:00"
    }
  ]

Internal Server Error

Status: 500

Get product by id

Endpoint to get a product by id

Request

Endpoint: [GET] /api/v1/products/{id}

Headers:
  Content-Type: application/json

Response

Success

Status: 200

Body:
  {
    "id": 1,
    "name": "foo",
    "code": "70a17d32-a670-4396-9706-bd0940152fc7",
    "stock_quantity": 1,
    "created_at": "2022-07-08T18:53:57.936433+01:00",
    "updated_at": "2022-07-08T18:53:57.936433+01:00"
  }

Not Found

Status: 404

Internal Server Error

Status: 500

Update product by id

Endpoint that updates a product by id

Request

Endpoint: [PUT] /api/v1/products/{id}

Headers:
  Content-Type: application/json

Body:
  {
    "name": "new product name",
    "stock_quantity": 5
  }

Response

Success

Status: 200

Body:
  {
    "id": 1,
    "name": "new product name",
    "code": "70a17d32-a670-4396-9706-bd0940152fc7",
    "stock_quantity": 5,
    "created_at": "2022-07-08T18:53:57.936433+01:00",
    "updated_at": "2022-07-08T18:53:57.936433+01:00"
  }

Bad Request

Status: 400

Not Found

Status: 404

Internal Server Error

Status: 500

Delete product by id

Endpoint to delete a product by id

Request

Endpoint: [DELETE] /api/v1/products/{id}

Headers:
  Content-Type: application/json

Response

Success

Status: 204

Not Found

Status: 404

Internal Server Error

Status: 500

GraphQL

The API also count with a GraphQL server that can be accessed on the endpoint /graphql. However, at the moment, only getProduct resolver is implemented.

Configuration

A file called .env has all config used in the project.

In the future, a service like Doppler or Vault could (and should) be used in the project.

CI/CD

The project uses Github CI to run tests, builds (and possibly deployments). You can see the badge below:

Steps:

1. Set up Nodejs
2. Build
3. Unit/Integration Test
4. Log in to the Container registry (Github)
5. Build and push Docker images

Roadmap

• Improvement: API docs are being described on the Readme. However, OpenAPI might be a good improvement in the future.
• Improvement: Using a secret management service like Doppler or Vault
• Chore add all resolvers from product CRUD to GraphQL's API.
• Fix: Date is not returning correctly from the resolvers.
• Fix: npm run docker:run has an issue when copying the prisma client.