Ciena Websocket - Fibonacci Communication

Socket implementation to handle comunications between entities, a server side and one or many clients.

The client will send numeric data into the server and this one will expose a Fibonacci sequence.

Also, the service will hang up waiting for the user to instance a new computation flow.

This is a code from Ciena challenge.

Installation Steps

As a recommendation, install a new virtual environment:

python3 -m venv env

source env/bin/activate

Now proceed with the installation of dependencies:

pip3 install -r requirements.txt

Create a file to store environment variables:

nano .env

# And write this:
HOST='localhost'
PORT='8000'

# Then save it and exit

How to Test

To cover unit testing I selected pytest as tool:

pytest test

# If you wanna be verbose
pytest test -s -v

How to Execute

Consider that the service has only one entry point "app.py" and two entities (server, client).

# Remember to activate the virtual environment before run the entry point

# Execute one server instance
python3 app.py --type server

# And only them, execute at least 1 client instance
python3 app.py --type client

If you instance a client without a server, will be exposed an error.

Also, there are only two allowed entities to run the project:

• server
• client

If you write another string, will be raise an error.

Importance notice

There is a problem buildind the dependency "evdev", happens on my distro: Ubuntu 20.04

Failed to build evdev

But the problem not affect the basic flows for the project.

Posible Problems

• If the client (or many of them) do not perform any action, the server and all the clients will be waiting forever.

• If no clients are connected and the server is running, them the server will be waiting forever.

Considering another solution

• As fan of framework and python technologies I can consider FastAPI as another tool set to solve this assessment. Some elements are already covered and easy to implement, for example: - Logs - Authentication - Authorization - Deploy to production

Improve scenarios

I consider some topics to improve the service:

• Fibonacci computation: The project implement a variant of Fibonacci, use a tiny persistance layer, to avoid re-computate of elements, but also could be use a memorization and implement the function in iterative manner, reducing the Big O complexity.

• Instalations by scopes DEV | STAGE | PROD: The install of depedencies is the same for every context, develop, stage and production. Could be segmented to expose a "context" and install depdencies in a proper way.

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