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==================================
Example using the Eventlet Pool
==================================
Introduction
============
This is a Celery application containing two example tasks.
First you need to install Eventlet, and also recommended is the `dnspython`
module (when this is installed all name lookups will be asynchronous)::
$ python -m pip install eventlet celery pybloom-live
Before you run any of the example tasks you need to start
the worker::
$ cd examples/eventlet
$ celery worker -l INFO --concurrency=500 --pool=eventlet
As usual you need to have RabbitMQ running, see the Celery getting started
guide if you haven't installed it yet.
Tasks
=====
* `tasks.urlopen`
This task simply makes a request opening the URL and returns the size
of the response body::
$ cd examples/eventlet
$ python
>>> from tasks import urlopen
>>> urlopen.delay('https://www.google.com/').get()
9980
To open several URLs at once you can do::
$ cd examples/eventlet
$ python
>>> from tasks import urlopen
>>> from celery import group
>>> result = group(urlopen.s(url)
... for url in LIST_OF_URLS).apply_async()
>>> for incoming_result in result.iter_native():
... print(incoming_result)
* `webcrawler.crawl`
This is a simple recursive web crawler. It will only crawl
URLs for the current host name. Please see comments in the
`webcrawler.py` file.
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