Python Redis

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.

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.

Common Bug

When running your server locally, you might see an error like this:

Traceback (most recent call last):
  File "/.../python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/.../python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/app/app/main.py", line 11, in <module>
    main()
  File "/app/app/main.py", line 6, in main
    s = socket.create_server(("localhost", 6379), reuse_port=True)
AttributeError: module 'socket' has no attribute 'create_server'

This is because socket.create_server was introduced in Python 3.8, and you might be running an older version.

You can fix this by installing Python 3.8 locally and using that.

Rimkomatic/Python-Redis-Server

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