taskiq-redis

TaskIQ-Redis

Taskiq-redis is a plugin for taskiq that adds a new broker and result backend based on redis.

Installation

To use this project you must have installed core taskiq library:

pip install taskiq

This project can be installed using pip:

pip install taskiq-redis

Usage

Let's see the example with the redis broker and redis async result:

# broker.py
import asyncio

from taskiq_redis import ListQueueBroker, RedisAsyncResultBackend

redis_async_result = RedisAsyncResultBackend(
    redis_url="redis://localhost:6379",
)

# Or you can use PubSubBroker if you need broadcasting
broker = ListQueueBroker(
    url="redis://localhost:6379",
    result_backend=redis_async_result,
)


@broker.task
async def best_task_ever() -> None:
    """Solve all problems in the world."""
    await asyncio.sleep(5.5)
    print("All problems are solved!")


async def main():
    task = await best_task_ever.kiq()
    print(await task.wait_result())


if __name__ == "__main__":
    asyncio.run(main())

Launch the workers: taskiq worker broker:broker Then run the main code: python3 broker.py

PubSubBroker and ListQueueBroker configuration

We have two brokers with similar interfaces, but with different logic. The PubSubBroker uses redis' pubsub mechanism and is very powerful, but it executes every task on all workers, because PUBSUB broadcasts message to all subscribers.

If you want your messages to be processed only once, please use ListQueueBroker. It uses redis' LPUSH and BRPOP commands to deal with messages.

Brokers parameters:

• url - url to redis.
• task_id_generator - custom task_id genertaor.
• result_backend - custom result backend.
• queue_name - name of the pub/sub channel in redis.
• max_connection_pool_size - maximum number of connections in pool.
• Any other keyword arguments are passed to redis.asyncio.BlockingConnectionPool. Notably, you can use timeout to set custom timeout in seconds for reconnects (or set it to None to try reconnects indefinitely).

RedisAsyncResultBackend configuration

RedisAsyncResultBackend parameters:

• redis_url - url to redis.
• keep_results - flag to not remove results from Redis after reading.
• result_ex_time - expire time in seconds (by default - not specified)
• result_px_time - expire time in milliseconds (by default - not specified)
• Any other keyword arguments are passed to redis.asyncio.BlockingConnectionPool. Notably, you can use timeout to set custom timeout in seconds for reconnects (or set it to None to try reconnects indefinitely).

IMPORTANT: It is highly recommended to use expire time ​​in RedisAsyncResultBackend If you want to add expiration, either result_ex_time or result_px_time must be set.

# First variant
redis_async_result = RedisAsyncResultBackend(
   redis_url="redis://localhost:6379",
   result_ex_time=1000,
)

# Second variant
redis_async_result = RedisAsyncResultBackend(
   redis_url="redis://localhost:6379",
   result_px_time=1000000,
)