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#! /usr/bin/env python
# -*- coding: utf-8 -
# pyAggr3g470r - A Web based news aggregator.
# Copyright (C) 2010-2015 Cédric Bonhomme - https://www.cedricbonhomme.org
#
# For more information : https://bitbucket.org/cedricbonhomme/pyaggr3g470r/
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 3.0 $"
__date__ = "$Date: 2010/09/02 $"
__revision__ = "$Date: 2015/01/21 $"
__copyright__ = "Copyright (c) Cedric Bonhomme"
__license__ = "AGPLv3"
import asyncio
import aiohttp
import logging
import requests
import feedparser
import dateutil.parser
from bs4 import BeautifulSoup
from pyaggr3g470r import utils
from pyaggr3g470r import conf
from pyaggr3g470r import db
from pyaggr3g470r.models import User, Article
logger = logging.getLogger(__name__)
#
# asyncio examples:
# -http://compiletoi.net/fast-scraping-in-python-with-asyncio.html
# - https://gist.github.com/kunev/f83146d407c81a2d64a6
#
@asyncio.coroutine
def get(*args, **kwargs):
kwargs["connector"] = aiohttp.TCPConnector(verify_ssl=False)
response = yield from aiohttp.request('GET', *args, **kwargs)
return (yield from response.read_and_close(decode=False))
@asyncio.coroutine
def fetch(user, feed):
"""
Fetch a feed.
"""
logger.info("Fetching the feed: " + feed.title)
print("Fetching the feed: " + feed.title)
data = yield from get(feed.link)
a_feed = feedparser.parse(data)
if a_feed['bozo'] == 1:
logger.error(a_feed['bozo_exception'])
if a_feed['entries'] == []:
return
# Feed informations
if feed.title == "":
try:
feed.title = a_feed.feed.title
except:
feed.title = "No title"
if feed.link == "":
try:
feed.link = a_feed.feed.link
except:
feed.link = ""
if feed.description == "":
try:
feed.description = a_feed.feed.subtitle
except:
feed.description = ""
articles = []
for article in a_feed['entries']:
try:
nice_url = article.link
except:
# if not able to get the link of the article, continue
continue
if conf.RESOLVE_ARTICLE_URL:
try:
# resolves URL behind proxies
# (like feedproxy.google.com)
r = requests.get(article.link, timeout=5.0)
nice_url = r.url
except Exception as error:
logger.warning(
"Unable to get the real URL of %s. Error: %s",
article.link, error)
continue
# remove utm_* parameters
nice_url = utils.clean_url(nice_url)
description = ""
article_title = article.get('title', '')
try:
# article content
description = article.content[0].value
except AttributeError:
# article description
description = article.get('description', '')
try:
description = BeautifulSoup(description, "lxml").decode()
except:
logger.error("Problem when sanitizing the content of the article %s (%s)",
article_title, nice_url)
post_date = None
for date_key in ('published_parsed', 'published',
'updated_parsed', 'updated'):
if not date_key in article:
continue
try:
post_date = dateutil.parser.parse(article[date_key],
dayfirst=True)
break
except:
try: # trying to clean date field from letters
post_date = dateutil.parser.parse(
re.sub('[A-z]', '', article[date_key]),
dayfirst=True)
break
except:
pass
# create the models.Article object and append it to the list of articles
article = Article(link=nice_url, title=article_title,
content=description, readed=False, like=False,
date=post_date, user_id=user.id,
feed_id=feed.id)
articles.append(article)
return articles
@asyncio.coroutine
def insert_database(user, feed):
articles = yield from asyncio.async(fetch(user, feed))
if None is articles:
return []
print('inserting articles for {}'.format(feed.title))
logger.info("Database insertion...")
new_articles = []
query1 = Article.query.filter(Article.user_id == user.id)
query2 = query1.filter(Article.feed_id == feed.id)
for article in articles:
exist = query2.filter(Article.link == article.link).count() != 0
if exist:
#logger.debug("Article %r (%r) already in the database.", article.title, article.link)
continue
if article.date is None:
article.date = datetime.now(dateutil.tz.tzlocal())
new_articles.append(article)
try:
feed.articles.append(article)
#db.session.merge(article)
db.session.commit()
#logger.info("New article % (%r) added.", article.title, article.link)
print("New article added: " + article.title)
except Exception as e:
logger.error("Error when inserting article in database: " + str(e))
continue
#db.session.close()
return new_articles
@asyncio.coroutine
def done(feed):
print('done {}'.format(feed.title))
sem = asyncio.Semaphore(5)
@asyncio.coroutine
def process_data(user, feed):
with (yield from sem):
data = yield from asyncio.async(insert_database(user, feed))
print('inserted articles for {}'.format(feed.title))
def retrieve_feed(user, feed_id=None):
"""
Launch the processus.
"""
logger.info("Starting to retrieve feeds.")
# 1 - Get the list of feeds to fetch
user = User.query.filter(User.email == user.email).first()
feeds = [feed for feed in user.feeds if feed.enabled]
if feed_id is not None:
feeds = [feed for feed in feeds if feed.id == feed_id]
# 2 - Fetch the feeds.
loop = asyncio.get_event_loop()
f = asyncio.wait([process_data(user, feed) for feed in feeds])
loop.run_until_complete(f)
"""
# 4 - Indexation
if not conf.ON_HEROKU:
self.index(new_articles)
# 5 - Mail notification
if not conf.ON_HEROKU and conf.NOTIFICATION_ENABLED:
self.mail_notification(new_articles)
"""
logger.info("All articles retrieved. End of the processus.")
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