huey, a little task queue
a lightweight alternative.
- a task queue (2019-04-01: version 2.0 released)
- written in python (2.7+, 3.4+)
- clean and simple API
- redis, sqlite, or in-memory storage
- example code.
- multi-process, multi-thread or greenlet task execution models
- schedule tasks to execute at a given time, or after a given delay
- schedule recurring tasks, like a crontab
- automatically retry tasks that fail
- task prioritization
- task result storage
- task locking
- task pipelines and chains
At a glance
from huey import RedisHuey, crontab huey = RedisHuey('my-app', host='redis.myapp.com') @huey.task() def add_numbers(a, b): return a + b @huey.task(retries=2, retry_delay=60) def flaky_task(url): # This task might fail, in which case it will be retried up to 2 times # with a delay of 60s between retries. return this_might_fail(url) @huey.periodic_task(crontab(minute='0', hour='3')) def nightly_backup(): sync_all_data()
Calling a task-decorated function will enqueue the function call for execution by the consumer. A special result handle is returned immediately, which can be used to fetch the result once the task is finished:
>>> from demo import add_numbers >>> res = add_numbers(1, 2) >>> res <Result: task 6b6f36fc-da0d-4069-b46c-c0d4ccff1df6> >>> res() 3
Tasks can be scheduled to run in the future:
>>> res = add_numbers.schedule((2, 3), delay=10) # Will be run in ~10s. >>> res(blocking=True) # Will block until task finishes, in ~10s. 5
Running the consumer
Run the consumer with four worker processes:
$ huey_consumer.py my_app.huey -k process -w 4
To run the consumer with a single worker thread (default):
$ huey_consumer.py my_app.huey
If your work-loads are mostly IO-bound, you can run the consumer with threads or greenlets instead. Because greenlets are so lightweight, you can run quite a few of them efficiently:
$ huey_consumer.py my_app.huey -k greenlet -w 32
Huey’s design and feature-set were informed by the capabilities of the Redis database. Redis is a fantastic fit for a lightweight task queueing library like Huey: it’s self-contained, versatile, and can be a multi-purpose solution for other web-application tasks like caching, event publishing, analytics, rate-limiting, and more.
Although Huey was designed with Redis in mind, the storage system implements a simple API and many other tools could be used instead of Redis if that’s your preference.
Huey comes with builtin support for Redis, Sqlite and in-memory storage.
Huey is named in honor of my cat:
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