Redis client for Python asyncio (PEP 3156)

Overview

Redis client for Python asyncio.

Build Status

Redis client for the PEP 3156 Python event loop.

This Redis library is a completely asynchronous, non-blocking client for a Redis server. It depends on asyncio (PEP 3156) and requires Python 3.6 or greater. If you're new to asyncio, it can be helpful to check out the asyncio documentation first.

Maintainers needed!

Right now, this library is working fine, but not actively maintained, due to lack of time and shift of priorities on my side (Jonathan). Most of my time doing open source goes to prompt_toolkt community.

I still merge pull request when they are fine, especially for bug/security fixes. But for a while now, we don't have new features. If you are already using it, then there's not really a need to worry, asyncio-redis will keep working fine, and we fix bugs, but it's not really evolving.

If anyone is interested to seriously take over development, please let me know. Also keep in mind that there is a competing library called aioredis, which does have a lot of activity.

See issue https://github.com/jonathanslenders/asyncio-redis/issues/134 to discuss.

Features

  • Works for the asyncio (PEP3156) event loop
  • No dependencies except asyncio
  • Connection pooling
  • Automatic conversion from unicode (Python) to bytes (inside Redis.)
  • Bytes and str protocols.
  • Completely tested
  • Blocking calls and transactions supported
  • Streaming of some multi bulk replies
  • Pubsub support

Trollius support: There is a fork by Ben Jolitz that has the necessary changes for using this asyncio-redis library with Trollius.

Installation

pip install asyncio_redis

Documentation

View documentation at read-the-docs

The connection class

A asyncio_redis.Connection instance will take care of the connection and will automatically reconnect, using a new transport when the connection drops. This connection class also acts as a proxy to a asyncio_redis.RedisProtocol instance; any Redis command of the protocol can be called directly at the connection.

import asyncio
import asyncio_redis


async def example():
    # Create Redis connection
    connection = await asyncio_redis.Connection.create(host='localhost', port=6379)

    # Set a key
    await connection.set('my_key', 'my_value')

    # When finished, close the connection.
    connection.close()


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(example())

Connection pooling

Requests will automatically be distributed among all connections in a pool. If a connection is blocking because of --for instance-- a blocking rpop, another connection will be used for new commands.

import asyncio
import asyncio_redis


async def example():
    # Create Redis connection
    connection = await asyncio_redis.Pool.create(host='localhost', port=6379, poolsize=10)

    # Set a key
    await connection.set('my_key', 'my_value')

    # When finished, close the connection pool.
    connection.close()

Transactions example

import asyncio
import asyncio_redis


async def example(loop):
    # Create Redis connection
    connection = await asyncio_redis.Pool.create(host='localhost', port=6379, poolsize=10)

    # Create transaction
    transaction = await connection.multi()

    # Run commands in transaction (they return future objects)
    f1 = await transaction.set('key', 'value')
    f2 = await transaction.set('another_key', 'another_value')

    # Commit transaction
    await transaction.exec()

    # Retrieve results
    result1 = await f1
    result2 = await f2

    # When finished, close the connection pool.
    connection.close()

It's recommended to use a large enough poolsize. A connection will be occupied as long as there's a transaction running in there.

Pubsub example

import asyncio
import asyncio_redis

async def example():
    # Create connection
    connection = await asyncio_redis.Connection.create(host='localhost', port=6379)

    # Create subscriber.
    subscriber = await connection.start_subscribe()

    # Subscribe to channel.
    await subscriber.subscribe([ 'our-channel' ])

    # Inside a while loop, wait for incoming events.
    while True:
        reply = await subscriber.next_published()
        print('Received: ', repr(reply.value), 'on channel', reply.channel)

    # When finished, close the connection.
    connection.close()

LUA Scripting example

import asyncio
import asyncio_redis

code = \
"""
local value = redis.call('GET', KEYS[1])
value = tonumber(value)
return value * ARGV[1]
"""


async def example():
    connection = await asyncio_redis.Connection.create(host='localhost', port=6379)

    # Set a key
    await connection.set('my_key', '2')

    # Register script
    multiply = await connection.register_script(code)

    # Run script
    script_reply = await multiply.run(keys=['my_key'], args=['5'])
    result = await script_reply.return_value()
    print(result) # prints 2 * 5

    # When finished, close the connection.
    connection.close()

Example using the Protocol class

import asyncio
import asyncio_redis


async def example():
    loop = asyncio.get_event_loop()

    # Create Redis connection
    transport, protocol = await loop.create_connection(
                asyncio_redis.RedisProtocol, 'localhost', 6379)

    # Set a key
    await protocol.set('my_key', 'my_value')

    # Get a key
    result = await protocol.get('my_key')
    print(result)

    # Close transport when finished.
    transport.close()

if __name__ == '__main__':
    asyncio.get_event_loop().run_until_complete(example())
Owner
Jonathan Slenders
Author of prompt_toolkit.
Jonathan Slenders
Logica is a logic programming language that compiles to StandardSQL and runs on Google BigQuery.

Logica: language of Big Data Logica is an open source declarative logic programming language for data manipulation. Logica is a successor to Yedalog,

Evgeny Skvortsov 1.5k Dec 30, 2022
SAP HANA Connector in pure Python

SAP HANA Database Client for Python Important Notice This public repository is read-only and no longer maintained. The active maintained alternative i

SAP Archive 299 Nov 20, 2022
High level Python client for Elasticsearch

Elasticsearch DSL Elasticsearch DSL is a high-level library whose aim is to help with writing and running queries against Elasticsearch. It is built o

elastic 3.6k Jan 03, 2023
Create a database, insert data and easily select it with Sqlite

sqliteBasics create a database, insert data and easily select it with Sqlite Watch on YouTube a step by step tutorial explaining this code: https://yo

Mariya 27 Dec 27, 2022
A Python Object-Document-Mapper for working with MongoDB

MongoEngine Info: MongoEngine is an ORM-like layer on top of PyMongo. Repository: https://github.com/MongoEngine/mongoengine Author: Harry Marr (http:

MongoEngine 3.9k Jan 08, 2023
A Python DB-API and SQLAlchemy dialect to Google Spreasheets

Note: shillelagh is a drop-in replacement for gsheets-db-api, with many additional features. You should use it instead. If you're using SQLAlchemy all

Beto Dealmeida 185 Jan 01, 2023
MySQL database connector for Python (with Python 3 support)

mysqlclient This project is a fork of MySQLdb1. This project adds Python 3 support and fixed many bugs. PyPI: https://pypi.org/project/mysqlclient/ Gi

PyMySQL 2.2k Dec 25, 2022
Generate database table diagram from SQL data definition.

sql2diagram Generate database table diagram from SQL data definition. e.g. "CREATE TABLE ..." See Example below How does it works? Analyze the SQL to

django-cas-ng 1 Feb 08, 2022
A Python-based RPC-like toolkit for interfacing with QuestDB.

pykit A Python-based RPC-like toolkit for interfacing with QuestDB. Requirements Python 3.9 Java Azul

QuestDB 11 Aug 03, 2022
A library for python made by me,to make the use of MySQL easier and more pythonic

my_ezql A library for python made by me,to make the use of MySQL easier and more pythonic This library was made by Tony Hasson , a 25 year old student

3 Nov 19, 2021
MinIO Client SDK for Python

MinIO Python SDK for Amazon S3 Compatible Cloud Storage MinIO Python SDK is Simple Storage Service (aka S3) client to perform bucket and object operat

High Performance, Kubernetes Native Object Storage 582 Dec 28, 2022
dask-sql is a distributed SQL query engine in python using Dask

dask-sql is a distributed SQL query engine in Python. It allows you to query and transform your data using a mixture of common SQL operations and Python code and also scale up the calculation easily

Nils Braun 271 Dec 30, 2022
Records is a very simple, but powerful, library for making raw SQL queries to most relational databases.

Records: SQL for Humans™ Records is a very simple, but powerful, library for making raw SQL queries to most relational databases. Just write SQL. No b

Kenneth Reitz 6.9k Jan 03, 2023
Little wrapper around asyncpg for specific experience.

Little wrapper around asyncpg for specific experience.

Nikita Sivakov 3 Nov 15, 2021
Neo4j Bolt driver for Python

Neo4j Bolt Driver for Python This repository contains the official Neo4j driver for Python. Each driver release (from 4.0 upwards) is built specifical

Neo4j 762 Dec 30, 2022
Implementing basic MongoDB CRUD (Create, Read, Update, Delete) queries, using Python.

MongoDB with Python Implementing basic MongoDB CRUD (Create, Read, Update, Delete) queries, using Python. We can connect to a MongoDB database hosted

MousamSingh 4 Dec 01, 2021
GINO Is Not ORM - a Python asyncio ORM on SQLAlchemy core.

GINO - GINO Is Not ORM - is a lightweight asynchronous ORM built on top of SQLAlchemy core for Python asyncio. GINO 1.0 supports only PostgreSQL with

GINO Community 2.5k Dec 27, 2022
Python DBAPI simplified

Facata A Python library that provides a simplified alternative to DBAPI 2. It provides a facade in front of DBAPI 2 drivers. Table of Contents Install

Tony Locke 44 Nov 17, 2021
Python ODBC bridge

pyodbc pyodbc is an open source Python module that makes accessing ODBC databases simple. It implements the DB API 2.0 specification but is packed wit

Michael Kleehammer 2.6k Dec 27, 2022
PostgreSQL database access simplified

Queries: PostgreSQL Simplified Queries is a BSD licensed opinionated wrapper of the psycopg2 library for interacting with PostgreSQL. The popular psyc

Gavin M. Roy 251 Oct 25, 2022