BullMQ For Python

This is the official BullMQ Python library. It is a close port of the NodeJS version of the library. Python Queues are interoperable with NodeJS Queues, as both libraries use the same .lua scripts that power all the functionality.

Features

Currently, the library does not support all the features available in the NodeJS version. The following have been ported so far:

• Add jobs to queues.

  • Regular jobs.
  • Delayed jobs.
  • Job deduplication.
  • Job priority.
  • Repeatable (via JobScheduler).

• Workers

• Job events (via QueueEvents and QueueEventsProducer).

• Job progress.

• Job retries.

• Job backoff.

• Getters.

• Flow Producer.

• Lock Manager (batched lock renewal).

• Global concurrency and rate limit.

• Per-job cancellation (cooperative AbortController).

Installation

pip install bullmq

Usage

Basic Example

from bullmq import Queue

queue = Queue('my-queue')

job = await queue.add('my-job', {'foo': 'bar'})

Job Priority

Prioritize jobs so higher priority jobs are processed first. Lower number = higher priority. 1 is the highest priority and 2_097_152 is the lowest. A priority of 0 (the default) means "no priority" and jobs are processed in FIFO order.

from bullmq import Queue

queue = Queue('my-queue')

# Higher priority job (will be processed first)
await queue.add('paint', {'color': 'red'}, {'priority': 1})

# Lower priority job
await queue.add('paint', {'color': 'blue'}, {'priority': 10})

Job Deduplication

Prevent duplicate jobs from being added to the queue:

from bullmq import Queue

queue = Queue('my-queue')

# Simple mode - deduplicates until job completes or fails
job = await queue.add('paint', {'color': 'white'}, {
    'deduplication': {
        'id': 'custom-dedup-id'
    }
})

# Throttle mode - deduplicates for a specific time window (in milliseconds)
job = await queue.add('paint', {'color': 'white'}, {
    'deduplication': {
        'id': 'custom-dedup-id',
        'ttl': 5000  # 5 seconds
    }
})

# Debounce mode - replaces pending job with latest data
job = await queue.add('paint', {'color': 'white'}, {
    'deduplication': {
        'id': 'custom-dedup-id',
        'ttl': 5000,
        'extend': True,  # Extend TTL on each duplicate attempt
        'replace': True  # Replace job data with latest
    },
    'delay': 5000  # Must be delayed for replace to work
})

Documentation

The documentation is available at https://docs.bullmq.io

License

MIT

Copyright

Copyright (c) 2018-2023, Taskforce.sh Inc. and other contributors.