tgext.rq

tgext.rq is a TurboGears2 extension that simplify rq usage for async jobs.

TLDR

Install

pip install tgext.rq #or

#setup.py
install_requires = [
    "TurboGears2 >= 2.4.3",
    "rq",
    ...,
    "tgext.rq"

Plug into TurboGears:

#config/app_cfg.py

import tgext.rq
tgext.rq.plugme(base_config)

Add configs:

#development.ini

redis.url = redis://127.0.0.1:6379/0
tgext.rq.application_queues_module = app.workers.queue
tgext.rq.application_queues_function = application_queues

Provide a method so tgext.rq know all queues that your application uses:

#app.workers.queue.py

def application_queues():
  return ['high_priority', 'default_priority', 'low_priority']

Run worker:

gearbox rq

Installing

Add tgext.rq to your setup.py, inside install_requires, something like:

#setup.py

install_requires = [
    "TurboGears2 >= 2.4.3",
    "rq",
    ...,
    "tgext.rq"

or install via pypi:

pip install tgext.rq

Enabling

To enable tgext.rq put inside your application config/app_cfg.py the following:

#config/app_cfg.py

import tgext.rq
tgext.rq.plugme(base_config)

Configuration

All configurations listed here should be done on tg .ini files, like development.ini or production.ini

Redis URL

#development.ini

redis.url = redis://USERNAME:PASSWORD@IP.ADDRESS.0.1:6379/DATABASE_NUMBER
redis.url = redis://user:test@127.0.0.1:6379/0
redis.url = redis://127.0.0.1:6379/0
redis.url = redis://redis/0 #If you use docker-compose to up redis

This config is required.

Queues

tgext.rq needs to know what queues it should listen and your application have to supply a module and function to do that. For example:

Imagine that your application have the following module: app.workers.queue.py:

#app.workers.queue.py

def application_queues():
  return ['high_priority', 'default_priority', 'low_priority']

You need to set these configs:

#development.ini

tgext.rq.application_queues_module = app.workers.queue
tgext.rq.application_queues_function = application_queues

ps: For now, only modules are supported. No classes.

This config is required.

Optional configs

#development.ini

tgext.rq.default_job_timeout = 180 #default value is 180.

Run RQ

tgext.rq provides a tg command to run a rq worker:

gearbox rq -c production.ini

or using the default development.ini file:

gearbox rq

Multithreding with Gevent

tgext.rq comes with options to use a gevent worker to enable more concurrency on job execution, to enable first add gevent to install_requires on setup.py

#setup.py

install_requires = [
    "TurboGears2 >= 2.4.3",
    "rq",
    ...,
    "tgext.rq >= 0.0.7",
    "gevent >= v1.1.2"

Then configure tgext.rq to use GeventWorker class:

#development.ini

tgext.rq.worker_class = GeventWorker #default value is: Worker
tgext.rq.gevent_pool_size = 3 #default value is: 20

If you receive any errors related to gevent patches, like:

super(SSLContext, SSLContext).options.__set__(self, value) [Previous line repeated 473 more times] RecursionError: maximum recursion depth exceeded

You need to patch manually your application before it loads, add these lines before everything else on app_cfg.py

from gevent import monkey
monkey.patch_all()

Contributions

Future Needs:

• tests
• more rq config options
• [add your needs here]

PRs are welcome!

Thanks

• GeventWorker is based on this github project: mikeabrahamsen/rq-gevent-worker

How to upload to Pip

This section is for the maintainer to remember how to upload to pypi. Move along.

python setup.py sdist
pip install twine
twine upload dist/*