lite-cache 0.1.3

Simple key-value cache for Python3 using SQLite3.

lite-cache

Branch	Build Status
master
develop

Simple sqlite key-value storage for Python3.

Python3 module for caching data during a program's runtime, with optional persistence.

Features

• Program specific cache.
• Simple encoding of data using standard json package.
• Optional persistence of data across multiple executions.
  • Useful for keeping some runtime data available to a program after a full exit.
    • ex. raise Exception or sys.exit(), etc

Installation (from PyPI, with PIP)

lite-cache requires Python >= 3.6.

1. If not already installed, install pip for Python 3
2. Install lite_cache

   $ pip3 install lite-cache
   

Usage

To use in default configuration:

• Entire cache is in 1 database file, ~/.local/litecache/cache.db

To use in custom configuration:

import lite_cache

program_cache = lite_cache.LiteCache(name='MyProgramCache', location='~/.local/litecache')
# This initializes and creates a new Sqlite3 database file in `location` directory,
# named as "`name`.cache".
# If directory does not exist, error is raised.

This strategy of having unique caches for each program is designed to navigate "same thread" or "single thread" issues with Python & Sqlite3.

• This would not prevent issues occurring if multiple instances of the same program were launched on the same machine.
  • ie. Executing same Python script in 2 terminal tabs. This would lead to two(2) threads attempting to access one(1) Sqlite3 with same name

Development

This project uses pipenv for managing virtual-environments and Python3 dependencies for development and testing.

• Reference: https://pypi.org/project/pipenv/

The standard requirements.txt is included for installation via setup.py

Tests

• Uses unittests

Run all tests from setup.py

pipenv run python setup.py test

Run specific test

pipenv run python -m unittest tests/test_main.py

Plans

• Interface for handling Python+Sqlite3 thread limitations.
• Data compression options

License

GPLv3