Flask Redis Caching

Overwiew

Flask Redis Caching is a Python library that provides caching functionalities using Redis for storing and retrieving cached values in Flask applications. This library aims to simplify caching operations and improve application performance by reducing database queries and computation time through caching.

Installation

You can install Flask Redis Caching via pip:

pip install flask-redis-caching

Features

• Dynamic Cache Key Generation: Can generate cache keys dynamically based on input parameters or custom logic, enabling flexible caching strategies (cache_key_getter param).
• Redis Integration: Seamless integration with Redis for efficient storage and retrieval of cached values.
• Decorator-based Caching: Easily cache the results of functions and methods using decorator syntax, reducing boilerplate code.
• Automatic Cache Expiration: Set expiration times for cached values, ensuring data remains fresh and relevant.

Usage

Initialization

Initialize Flask Redis Caching in your Flask application by passing the Flask app instance to the RedisCaching constructor:

from flask import Flask
from flask_redis_caching import RedisCaching

app = Flask(__name__)
app.config['CACHING_REDIS_URL'] = "redis://:@localhost:6379/0"
redis_caching = RedisCaching(app)

Or you can do it later by redis_caching.init_app(app) function.

redis_caching = RedisCaching()
redis_caching.init_app(app)

Caching Decorators

Class Method Caching You can cache the result of a class method using the cached_result decorator. Example:

class DynamicValues:
    def __init__(self, uuid: str) -> None:
        self.uuid = uuid

    @redis_caching.cached_result(
        cache_key_getter=lambda self: self.uuid + '-long_function', # Dynamic cache_key, for e.g you can access here the class object.
        expires_in=60,
        is_class_function=True
    )
    def long_function(self):
        # Your expensive computation here

Function Caching Similarly, you can cache the result of a function using the cached_result decorator. Example:

@redis_caching.cached_result(cache_key="long_function", is_class_function=False, expires_in=30) # cache_key_getter can be used aswell.
def long_function():
    # Your expensive computation here

Cache Management

You can manually expire a cached value using the make_cache_expired method:

def function_that_expires_the_cache():
    redis_caching.make_cache_expired('long_function')

Integration with Flask Routes

Integrate Flask Redis Caching with your Flask routes to cache the results of route handlers:

from time import sleep

from flask import Flask
from flask_redis_caching import RedisCaching

app = Flask(__name__)
app.config['CACHING_REDIS_URL'] = "redis://:@localhost:6379/0"
redis_caching = RedisCaching(app)

@redis_caching.cached_result(cache_key="long_function", is_class_function=False, expires_in=30)
def long_function():
    sleep(5)

    return "Lemme cache this"

@app.route('/')
def route():
    result = long_function()  # If the cached value is present, it will be returned; otherwise, the function will be executed.
    return result

Configuration

RedisCaching allows you to configure Redis connection settings using Flask application configuration. By default, it looks for configuration variables prefixed with CACHING_REDIS_URL. You can customize the configuration prefix by passing the config_prefix parameter during initialization.

Logging

RedisCaching provides optional logging to track caching operations. Logging is enabled by default, but you can disable it by passing log=False during initialization.

Contributing

If you have any suggestions, bug reports, or contributions, feel free to open an issue or create a pull request on GitHub.

License

This project is licensed under the MIT License - see the LICENSE file for details.