Fix eventlet example from not running.

examples/eventlet/README.rst

@@ -10,9 +10,7 @@ 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)::
 
-    $ pip install eventlet
-    $ pip install dnspython
-    $ pip install requests
+    $ python -m pip install eventlet celery pybloom-live
 
 Before you run any of the example tasks you need to start
 the worker::
@@ -34,7 +32,7 @@ of the response body::
     $ cd examples/eventlet
     $ python
     >>> from tasks import urlopen
-    >>> urlopen.delay('http://www.google.com/').get()
+    >>> urlopen.delay('https://www.google.com/').get()
     9980
 
 To open several URLs at once you can do::

examples/eventlet/celeryconfig.py

@@ -9,7 +9,6 @@
 
 broker_url = 'amqp://guest:guest@localhost:5672//'
 worker_disable_rate_limits = True
-result_backend = 'amqp'
 result_expires = 30 * 60
 
 imports = ('tasks', 'webcrawler')

examples/eventlet/tasks.py

@@ -1,13 +1,14 @@
 import requests
 
-from celery import task
+from celery import shared_task
 
 
-@task()
+@shared_task()
 def urlopen(url):
     print(f'-open: {url}')
     try:
         response = requests.get(url)
     except requests.exceptions.RequestException as exc:
         print(f'-url {url} gave error: {exc!r}')
+        return
     return len(response.text)

examples/eventlet/webcrawler.py

@@ -24,9 +24,9 @@
 
 import requests
 from eventlet import Timeout
-from pybloom import BloomFilter
+from pybloom_live import BloomFilter
 
-from celery import group, task
+from celery import group, shared_task
 
 try:
     from urllib.parse import urlsplit
@@ -43,7 +43,7 @@ def domain(url):
     return urlsplit(url)[1].split(':')[0]
 
 
-@task(ignore_result=True, serializer='pickle', compression='zlib')
+@shared_task(ignore_result=True, serializer='pickle', compression='zlib')
 def crawl(url, seen=None):
     print(f'crawling: {url}')
     if not seen: