pyxqueue

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a multi-processes task queue using redis streams.

install

pyxqueue uses some feature of python 3.7, so you should use python 3.7 or newer.

pip install pyxqueue

Usage

background task

import time

import redis
from pyxqueue import TaskQueue

client = redis.Redis()
queue = TaskQueue(client, stream_key='background-task')


@queue.task
def sleep(n):
    print(f'going to sleep for {n} seconds')
    time.sleep(n)
    print(f'woke up after {n} seconds')


if __name__ == '__main__':
    import sys
    usage = 'Usage: python background-task.py (worker | test)'
    if len(sys.argv) != 2:
        print(usage)
    elif sys.argv[1] == 'worker':
        queue.run()
    elif sys.argv[1] == 'test':
        sleep(2)
    else:
        print(usage)

rpc

import redis
from pyxqueue import TaskQueue

client = redis.Redis()
queue = TaskQueue(client, stream_key='rpc')


@queue.task
def fib(n):
    a, b = 0, 1
    for _ in range(n):
        a, b = b, a + b
    return b


if __name__ == '__main__':
    import sys
    usage = 'Usage: python rpc.py (worker | test)'
    if len(sys.argv) != 2:
        print(usage)
    elif sys.argv[1] == 'worker':
        queue.run()
    elif sys.argv[1] == 'test':
        fib_100k_result = fib(100_000)
        print(f'100kth fib number starts ends with: {str(fib_100k_result.get())[-6:]}')
    else:
        print(usage)

task info

>>> task_id = b'1551943344215-0'
>>> queue.get_task(task_id)
{
    'task_id': b'1551943344215-0',
    'info': {
        'state': 2,
        'value': None,
        'worker': 'worker-1-66202570-40a9-11e9-bc87-00163e0eb975',
        'update_time': 1551943344
    },
    'data': {
        b'task': b'{"task_name": "queues.spider.download", "args": [75], "kwargs": {}}'
    }
}

progress

import time

import redis
from pyxqueue import TaskQueue

client = redis.Redis()
queue = TaskQueue(client, stream_key='progress')


@queue.task
def long_work():
    for i in range(100):
        queue.update_task_progress(i)
        time.sleep(1)


if __name__ == '__main__':
    import sys
    usage = 'Usage: python progress.py (worker | test)'
    if len(sys.argv) != 2:
        print(usage)
    elif sys.argv[1] == 'worker':
        queue.run()
    elif sys.argv[1] == 'test':
        long_work()
    else:
        print(usage)

notes

this package is heavily inspired from: http://charlesleifer.com/blog/multi-process-task-queue-using-redis-streams/