totoro 0.1.3

Celery integration with Tornado

Celery integration with Tornado.

Installation

You can install Totoro either via the Python Package Index (PyPI) or from source.

To install using pip, simply:

$ sudo pip install totoro

or alternatively (you really should be using pip though):

$ sudo easy_install totoro

or from source:

$ sudo python setup.py install

Totoro can only support AMQP(RabbitMQ) by default. To use the Redis, you can specify the requirements on the pip comand-line by using brackets.

$ sudo pip install totoro[redis]

Hello, world

Here is a simple “Hello, world!” example for calling celery tasks from Tornado RequestHandler:

#!/usr/bin/env python

import tornado.httpserver
import tornado.ioloop
import tornado.web

from tornado import gen
import totoro
from totoro.test.celery_tasks import tasks


class MainHandler(tornado.web.RequestHandler):
    @gen.coroutine
    def get(self):
        response = yield gen.Task(tasks.echo.apply_async, args=['Hello world!'])
        self.write(response.result)


def main():
    totoro.setup_producer()
    application = tornado.web.Application([
        (r"/", MainHandler),
    ])
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()


if __name__ == "__main__":
    main()

To run celery worker for the example:

$ python -m totoro.test.runtasks worker -l INFO

Configuration and defaults

TOTORO_AMQP_CONNECTION_POOL

New in version 0.1.2

The setting must a dict that used to configure the AMQP(RabbitMQ) connection pool. It supporting the following keys:

• max_idle_connections - Max number of keeping connections. Defaults to 3.
• max_open_connections - Max number of opened connections, 0 means no limit. Defaults to 10.
• max_recycle_sec - How long connections are recycled. Defaults to 3600.

Example configuration:

celery = Celery("totoro_celery_tasks")
celery.conf.update(
    BROKER_URL='amqp://guest:guest@localhost:5672//',
    CELERY_TASK_SERIALIZER='json',
    CELERY_ACCEPT_CONTENT=['json'],  # Ignore other content
    CELERY_RESULT_SERIALIZER='json',
    CELERY_TIMEZONE='Asia/Shanghai',
    CELERY_ENABLE_UTC=True,
    TOTORO_AMQP_CONNECTION_POOL={
        'max_idle_connections': 1,
        'max_open_connections': 10,
        'max_recycle_sec': 3600
    },
)

Tests

To run the tests for the AMQP(broker/backend):

$ python -m totoro.test.runtasks worker -l INFO
$ python -m totoro.test.runtests

To run the tests for the AMQP broker with the Redis backend:

$ CELERY_RESULT_BACKEND=redis://127.0.0.1:6379/0  python -m totoro.test.runtasks worker -l INFO
$ CELERY_RESULT_BACKEND=redis://127.0.0.1:6379/0  python -m totoro.test.runtests

To run the tests for the Redis(broker/backend):

$ BROKER_URL=redis://127.0.0.1:6379/0  CELERY_RESULT_BACKEND=redis://127.0.0.1:6379/0 python -m totoro.test.runtasks worker -l INFO
$ BROKER_URL=redis://127.0.0.1:6379/0  CELERY_RESULT_BACKEND=redis://127.0.0.1:6379/0 python -m totoro.test.runtests