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Diffstat (limited to 'src/crawler/default_crawler.py')
| -rw-r--r-- | src/crawler/default_crawler.py | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/crawler/default_crawler.py b/src/crawler/default_crawler.py new file mode 100644 index 00000000..34726a83 --- /dev/null +++ b/src/crawler/default_crawler.py @@ -0,0 +1,203 @@ +#! /usr/bin/env python +# -*- coding: utf-8 - + +# newspipe - A Web based news aggregator. +# Copyright (C) 2010-2016 Cédric Bonhomme - https://www.cedricbonhomme.org +# +# For more information : https://github.com/Newspipe/Newspipe +# +# 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: 3.3 $" +__date__ = "$Date: 2010/09/02 $" +__revision__ = "$Date: 2015/12/07 $" +__copyright__ = "Copyright (c) Cedric Bonhomme" +__license__ = "AGPLv3" + +import asyncio +import logging +import feedparser +import dateutil.parser +from datetime import datetime, timezone, timedelta +from sqlalchemy import or_ + +import conf +from bootstrap import db +from web.models import User +from web.controllers import FeedController, ArticleController +from lib.feed_utils import construct_feed_from, is_parsing_ok +from lib.article_utils import construct_article, extract_id, \ + get_article_content + +logger = logging.getLogger(__name__) + +sem = asyncio.Semaphore(5) + +import ssl +try: + _create_unverified_https_context = ssl._create_unverified_context +except AttributeError: + # Legacy Python that doesn't verify HTTPS certificates by default + pass +else: + # Handle target environment that doesn't support HTTPS verification + ssl._create_default_https_context = _create_unverified_https_context + + +async def get(*args, **kwargs): + #kwargs["connector"] = aiohttp.TCPConnector(verify_ssl=False) + try: + data = feedparser.parse(args[0]) + return data + except Exception as e: + raise e + + +async def parse_feed(user, feed): + """ + Fetch a feed. + Update the feed and return the articles. + """ + parsed_feed = None + up_feed = {} + articles = [] + with (await sem): + try: + parsed_feed = await get(feed.link) + except Exception as e: + up_feed['last_error'] = str(e) + up_feed['error_count'] = feed.error_count + 1 + logger.exception("error when parsing feed: " + str(e)) + finally: + up_feed['last_retrieved'] = datetime.now(dateutil.tz.tzlocal()) + if parsed_feed is None: + try: + FeedController().update({'id': feed.id}, up_feed) + except Exception as e: + logger.exception('something bad here: ' + str(e)) + return + + if not is_parsing_ok(parsed_feed): + up_feed['last_error'] = str(parsed_feed['bozo_exception']) + up_feed['error_count'] = feed.error_count + 1 + FeedController().update({'id': feed.id}, up_feed) + return + if parsed_feed['entries'] != []: + articles = parsed_feed['entries'] + + up_feed['error_count'] = 0 + up_feed['last_error'] = "" + + # Feed informations + construct_feed_from(feed.link, parsed_feed).update(up_feed) + if feed.title and 'title' in up_feed: + # do not override the title set by the user + del up_feed['title'] + FeedController().update({'id': feed.id}, up_feed) + + return articles + + +async def insert_database(user, feed): + articles = await parse_feed(user, feed) + if None is articles: + return [] + + logger.info('Inserting articles for {}'.format(feed.title)) + + new_articles = [] + art_contr = ArticleController(user.id) + for article in articles: + new_article = await construct_article(article, feed) + + try: + existing_article_req = art_contr.read(feed_id=feed.id, + entry_id=extract_id(article)) + except Exception as e: + logger.exception("existing_article_req: " + str(e)) + continue + exist = existing_article_req.count() != 0 + if exist: + # if the article has been already retrieved, we only update + # the content or the title + logger.info('Article already in the database: {}'. \ + format(article['link'])) + existing_article = existing_article_req.first() + + if new_article['date'].replace(tzinfo=None) != \ + existing_article.date: + existing_article.date = new_article['date'] + existing_article.updated_date = new_article['date'] + if existing_article.title != new_article['title']: + existing_article.title = new_article['title'] + content = get_article_content(article) + if existing_article.content != content: + existing_article.content = content + existing_article.readed = False + art_contr.update({'entry_id': existing_article.entry_id}, + existing_article.dump()) + logger.info('Article updated: {}'.format(article['link'])) + continue + + # insertion of the new article + try: + new_articles.append(art_contr.create(**new_article)) + logger.info('New article added: {}'.format(new_article['link'])) + except Exception: + logger.exception('Error when inserting article in database:') + continue + return new_articles + + +async def init_process(user, feed): + # Fetch the feed and insert new articles in the database + try: + articles = await insert_database(user, feed) + logger.debug('inserted articles for %s', feed.title) + return articles + except Exception as e: + logger.exception('init_process: ' + str(e)) + + +def retrieve_feed(loop, user, feed_id=None): + """ + Launch the processus. + """ + logger.info('Starting to retrieve feeds for {}'.format(user.nickname)) + + # Get the list of feeds to fetch + filters = {} + filters['user_id'] = user.id + if feed_id is not None: + filters['id'] = feed_id + filters['enabled'] = True + filters['error_count__lt'] = conf.DEFAULT_MAX_ERROR + filters['last_retrieved__lt'] = datetime.now() - \ + timedelta(minutes=conf.FEED_REFRESH_INTERVAL) + feeds = FeedController().read(**filters).all() + + if feeds == []: + logger.info('No feed to retrieve for {}'.format(user.nickname)) + return + + # Launch the process for all the feeds + tasks = [asyncio.ensure_future(init_process(user, feed)) for feed in feeds] + + try: + loop.run_until_complete(asyncio.wait(tasks)) + except Exception: + logger.exception('an error occured') + finally: + logger.info('Articles retrieved for {}'.format(user.nickname)) |