Todo Space 📑

💡 Objective

Develop a TODO API using Golang and ScyllaDB that supports basic CRUD operations and includes 
pagination functionality for the list endpoint.

📒 Requirements

• Set up a Golang project and integrate ScyllaDB as the database for storing TODO items. Ensure that items in the database are stored user-wise.
• Implement endpoints for creating, reading, updating, and deleting TODO items for a single user at a time. Each TODO item should have at least the following properties: id, user_id, title, description, status, created, updated.
• Implement a paginated list endpoint to retrieve TODO items.
• Provide support for filtering based on TODO item status (e.g., pending, completed).

⚙️ API Documentation

POST /v1/todo

Create a new todo item.

• URL: http://localhost:8080/v1/todo
• Method: POST
• Body: json

  {
      "id": "004599c1-69d7-47b8-8306-a144d7265538",
      "user_id": "004599c1-69d7-47b8-8306-a144d7265538",
      "title": "Complete project tasks",
      "description": "Finish coding the backend and write documentation",
      "status": "Complete",
      "created": "2024-06-10T12:00:00Z",
      "updated": "2024-06-10T12:00:00Z"
  }
  

PUT /v1/todo/:id

Update a specific todo item.

• URL: http://localhost:8080/v1/todo/:id
• Method: PUT
• URL Parameters:
  • id: ID of the todo item to update

DELETE /v1/todo/:id

Delete a specific todo item.

• URL: http://localhost:8080/v1/todo/:id
• Method: DELETE
• URL Parameters:
  • id: ID of the todo item to delete

GET /v1/todo/:id

Retrieve details of a specific todo item.

• URL: http://localhost:8080/v1/todo/:id
• Method: GET
• URL Parameters:
  • id: ID of the todo item to retrieve

GET /v1/todo

Retrieve all todo items based on filters.

• URL: http://localhost:8080/v1/todo
• Method: GET
• Query Parameters:
  • status: Filter by status (pending or completed)
  • size: Number of items to retrieve (default 10)
  • lastPageToken: Offset for pagination (default 0)

🏃‍♂️ Run Locally

• Clone this repository.

  https://github.com/debrajhyper/Todo-Space.git

• Install Docker Desktop.
• Run docker-compose -f todospace-api.yml up to initialize a Scylla-DB instance running on port 9042.
• Go from the main directory to \cmd\api and then run go run main.go to start the service.

Note: If you are facing issue while connecting the golang backend services with the ScyllaDB then run the below steps.

• open cmd and enter the command to execute the cqlsh in the scylla-db instance.

  docker exec -it scylla-db cqlsh

Note down the IP(172.23.0.2)(might be change according to your docker configuration) and change it to the scylladb.go file.

• Now in the cqlsh terminal create the KEYSPACE manually by the following command:

  CREATE KEYSPACE todo WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};

• Now enter the command to use the todo KEYSPACE

  use todo;

• Now create the todos table from the below query

  CREATE TABLE IF NOT EXISTS todos (id UUID,user_id UUID,title TEXT,description TEXT,status TEXT,created TEXT,updated TEXT,PRIMARY KEY (id, user_id));

Features Implemented:

• Implemented CRUD routes for interaction b/w server and ScyllaDB.
• The API's are paginated for easy data retrieval.
• The application's DB part is Dockerized and is stateful through volumes.
• Support for filtering based on TODO item status (e.g., pending, completed).

Current Architecture:

• Containerized approach to solving the problem statement.
• Two Interfaces one for the server and one for db are interacting between each other for the backend application.

Future Scope:

• The current architecture is a very basic implementation of the problem statement.
• Depending upon the scale, the entire architecture can be scaled horizontally using nginx load balancing.
• Web can use a queueing mechanism like Rabbit or BullMQ to introduce pub-sub architecture to improve performance.
• The Go-Server could be containerized to improve deployment.
• Introduction to goroutines would increase the overall throughput of the service.

👨🏻‍💻 Developer's Talk

Developed by Debraj Karmakar

This is a small effort from my side to build a small scale project using Golang and ScyllaDB technologies. The experience taught me so many things, as well as the challenges involved in overcoming problems encountered during the development phase. I consider this project very relevant to me as a full-stack developer.

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