Redis Clone

This is a simple implementation of a Redis clone written in Python. It is not meant to be a fully-featured Redis server, but rather a demonstration of how the Redis protocol works. I developed it following the challenge on the wonderful website CodeCrafters.

Features

The following Redis commands are implemented:

• PING: Sends a PONG response to the client.
• ECHO: Echoes back the provided argument to the client.
• SET: Sets a key-value pair in the database. Optionally takes a px argument to set an expiry time in milliseconds.
• GET: Gets the value of a key from the database. If the key has an expiry time set and it has passed, the key-value pair is deleted and -1 is returned to the client.

Running the Server

To run the server, simply execute the following command (it requires Python 3):

./redis-clone

The server will listen on localhost:6379 for incoming connections.

Connecting to the Server

You can use any Redis client to connect to the server. For example, to connect to the server using redis-cli, run the following command:

redis-cli -h localhost -p 6379

You should then see a 127.0.0.1:6379> prompt, where you can enter Redis commands as you would with a regular Redis server.

Limitations

This Redis clone has several limitations compared to a real Redis server:

• Only a limited set of commands are implemented.
• The database is not persisted to disk, so all data is lost when the server is stopped.
• There is no support for multiple databases or authentication.