coredis 4.5.5

Python async client for Redis key-value store

coredis

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coredis is an async redis client with support for redis server, cluster & sentinel.

• The client API mirrors the specifications in the Redis command documentation by using the following rules:

  • Arguments retain naming from redis as much as possible
  • Only optional variadic arguments are mapped to variadic positional or keyword arguments. When the variable length arguments are not optional (which is almost always the case) the expected argument is an iterable of type Parameters or Mapping.
  • Pure tokens used as flags are mapped to boolean arguments
  • One of arguments accepting pure tokens are collapsed and accept a PureToken

• Responses are mapped as closely from redis <-> python types as possible.

• For higher level concepts such as Pipelines, LUA Scripts, PubSub & Streams abstractions are provided to simplify interaction requires pre-defined sequencing of redis commands (see Command Wrappers) and the Handbook.

It is strongly recommended to use a static type checker of your choice to catch any errors with respect to argument and response types. If static type checking is not a part of your workflow, you can consider using the optional runtime type validation provided with the help of the excellent beartype library.

---

• Installation
• Feature Summary
  • Deployment topologies
  • Application patterns
  • Server side scripting
  • Miscellaneous
• Quick start
  • Single Node client
  • Cluster client
• Compatibility
  • Supported python versions
  • Redis-like Backends
• References

Installation

To install coredis:

$ pip install coredis

Feature Summary

Deployment topologies

• Redis Cluster
• Sentinel

Application patterns

• Connection Pooling
• PubSub
• Sharded PubSub [>= Redis 7.0]
• Stream Consumers
• Pipelining
• Client side caching

Server side scripting

• LUA Scripting
• Redis Libraries and functions [>= Redis 7.0]

Miscellaneous

• Public API annotated with type annotations
• Optional Runtime Type Validation (via beartype)

Quick start

Single Node client

import asyncio
from coredis import Redis

async def example():
    client = Redis(host='127.0.0.1', port=6379, db=0)
    await client.flushdb()
    await client.set('foo', 1)
    assert await client.exists(['foo']) == 1
    await client.incr('foo')
    await client.incrby('foo', increment=100)

    assert int(await client.get('foo')) == 102
    await client.expire('foo', 1)
    await asyncio.sleep(0.1)
    await client.ttl('foo')
    await asyncio.sleep(1)
    assert not await client.exists(['foo'])

asyncio.run(example())

Cluster client

import asyncio
from coredis import RedisCluster

async def example():
    client = RedisCluster(host='172.17.0.2', port=7001)
    await client.flushdb()
    await client.set('foo', 1)
    await client.lpush('a', [1])
    print(await client.cluster_slots())

    await client.rpoplpush('a', 'b')
    assert await client.rpop('b') == b'1'

asyncio.run(example())
# {(10923, 16383): [{'host': b'172.17.0.2', 'node_id': b'332f41962b33fa44bbc5e88f205e71276a9d64f4', 'server_type': 'master', 'port': 7002},
# {'host': b'172.17.0.2', 'node_id': b'c02deb8726cdd412d956f0b9464a88812ef34f03', 'server_type': 'slave', 'port': 7005}],
# (5461, 10922): [{'host': b'172.17.0.2', 'node_id': b'3d1b020fc46bf7cb2ffc36e10e7d7befca7c5533', 'server_type': 'master', 'port': 7001},
# {'host': b'172.17.0.2', 'node_id': b'aac4799b65ff35d8dd2ad152a5515d15c0dc8ab7', 'server_type': 'slave', 'port': 7004}],
# (0, 5460): [{'host': b'172.17.0.2', 'node_id': b'0932215036dc0d908cf662fdfca4d3614f221b01', 'server_type': 'master', 'port': 7000},
# {'host': b'172.17.0.2', 'node_id': b'f6603ab4cb77e672de23a6361ec165f3a1a2bb42', 'server_type': 'slave', 'port': 7003}]}

To see a full list of supported redis commands refer to the Command compatibility documentation

Compatibility

coredis is tested against redis versions 6.0.x, 6.2.x & 7.0.x. The test matrix status can be reviewed here

coredis is additionally tested against:

• uvloop >= 0.15.0

Supported python versions

• 3.7
• 3.8
• 3.9
• 3.10
• PyPy 3.7
• PyPy 3.8
• PyPy 3.9

Redis-like backends

coredis is known to work with the following databases that have redis protocol compatibility:

• KeyDB
• Dragonfly

References

• Documentation (Stable)
• Documentation (Latest)
• Changelog
• Project History