coredis 4.11.2

Python async client for Redis key-value store

coredis

---

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

• The client API uses the specifications in the Redis command documentation to define the API by using the following conventions:

  • 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 RESP <-> 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.

Warning The command API does NOT mirror the official python redis client. For details about the high level differences refer to Divergence from aredis & redis-py

---

• 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 or Cluster client

import asyncio
from coredis import Redis, RedisCluster

async def example():
    client = Redis(host='127.0.0.1', port=6379, db=0)
    # or with redis cluster
    # client = RedisCluster(startup_nodes=[{"host": "127.0.01", "port": 7001}]) 
    await client.flushdb()
    await client.set('foo', 1)
    assert await client.exists(['foo']) == 1
    assert await client.incr('foo') == 2
    assert await client.incrby('foo', increment=100) == 102
    assert int(await client.get('foo')) == 102
    
    assert await client.expire('foo', 1)
    await asyncio.sleep(0.1)
    assert await client.ttl('foo') == 1
    assert await client.pttl('foo') < 1000
    await asyncio.sleep(1)
    assert not await client.exists(['foo'])

asyncio.run(example())

Sentinel

import asyncio
from coredis.sentinel import Sentinel

async def example():
    sentinel = Sentinel(sentinels=[("localhost", 26379)]) 
    primary = sentinel.primary_for("myservice")
    replica = sentinel.replica_for("myservice")
    
    assert await primary.set("fubar", 1)
    assert int(await replica.get("fubar")) == 1

asyncio.run(example())

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
• 3.11
• 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