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"""A simple web server that accepts POSTS containing a list of feed urls,
and returns the titles of those feeds.
"""
import eventlet
feedparser = eventlet.import_patched('feedparser')
# the pool provides a safety limit on our concurrency
pool = eventlet.GreenPool()
def fetch_title(url):
d = feedparser.parse(url)
return d.feed.get('title', '')
def app(environ, start_response):
if environ['REQUEST_METHOD'] != 'POST':
start_response('403 Forbidden', [])
return []
# the pile collects the result of a concurrent operation -- in this case,
# the collection of feed titles
pile = eventlet.GreenPile(pool)
for line in environ['wsgi.input'].readlines():
url = line.strip()
if url:
pile.spawn(fetch_title, url)
# since the pile is an iterator over the results,
# you can use it in all sorts of great Pythonic ways
titles = '\n'.join(pile)
start_response('200 OK', [('Content-type', 'text/plain')])
return [titles]
if __name__ == '__main__':
from eventlet import wsgi
wsgi.server(eventlet.listen(('localhost', 9010)), app)
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