321 lines
13 KiB
Python
321 lines
13 KiB
Python
import datetime
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import enum
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import os
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from sqlalchemy import create_engine, Column, Integer, String, DateTime, \
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Enum, ForeignKey
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from sqlalchemy.orm import sessionmaker, scoped_session
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.sql.expression import func
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from platypush.backend.http.request import HttpRequest
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from platypush.config import Config
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from platypush.context import get_plugin
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from platypush.message.event.http.rss import NewFeedEvent
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Base = declarative_base()
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Session = scoped_session(sessionmaker())
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class RssUpdates(HttpRequest):
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"""
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Gets new items in an RSS feed. You can use this type of object within the context of the
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:class:`platypush.backend.http.poll.HttpPollBackend` backend. Example:
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.. code-block:: yaml
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backend.http.poll:
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requests:
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- type: platypush.backend.http.request.rss.RssUpdates
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url: https://www.technologyreview.com/feed/
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title: MIT Technology Review
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poll_seconds: 86400 # Poll once a day
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digest_format: html # Generate an HTML feed with the new items
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Triggers:
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- :class:`platypush.message.event.http.rss.NewFeedEvent` when new items are parsed from a feed or a new digest
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is available.
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Requires:
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* **feedparser** (``pip install feedparser``)
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"""
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user_agent = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) ' + \
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'Chrome/62.0.3202.94 Safari/537.36'
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def __init__(self, url, title=None, headers=None, params=None, max_entries=None,
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extract_content=False, digest_format=None, user_agent: str = user_agent,
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body_style: str = 'font-size: 22px; ' +
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'font-family: "Merriweather", Georgia, "Times New Roman", Times, serif;',
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title_style: str = 'margin-top: 30px',
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subtitle_style: str = 'margin-top: 10px; page-break-after: always',
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article_title_style: str = 'page-break-before: always',
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article_link_style: str = 'color: #555; text-decoration: none; border-bottom: 1px dotted',
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article_content_style: str = '', *argv, **kwargs):
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"""
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:param url: URL to the RSS feed to be monitored.
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:param title: Optional title for the feed.
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:param headers: Extra headers to be passed to the request.
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:param params: Extra GET parameters to be appended to the URL.
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:param max_entries: Maximum number of entries that will be returned in a single
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:class:`platypush.message.event.http.rss.NewFeedEvent` event.
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:param extract_content: Whether the context should also be extracted (through the
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:class:`platypush.plugins.http.webpage.HttpWebpagePlugin` plugin) (default: ``False``).
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:param digest_format: Format of the digest output file (default: None, text. Other supported types: ``html``
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and ``pdf`` (requires the ``weasyprint`` module installed).
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:param user_agent: User agent string to be passed on the request.
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:param body_style: CSS style for the body.
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:param title_style: CSS style for the feed title.
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:param subtitle_style: CSS style for the feed subtitle.
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:param article_title_style: CSS style for the article titles.
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:param article_link_style: CSS style for the article link.
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:param article_content_style: CSS style for the article content.
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"""
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self.workdir = os.path.join(os.path.expanduser(Config.get('workdir')), 'feeds')
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self.dbfile = os.path.join(self.workdir, 'rss.db')
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self.url = url
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self.title = title
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self.max_entries = max_entries
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self.user_agent = user_agent
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self.body_style = body_style
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self.title_style = title_style
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self.subtitle_style = subtitle_style
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self.article_title_style = article_title_style
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self.article_link_style = article_link_style
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self.article_content_style = article_content_style
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# If true, then the http.webpage plugin will be used to parse the content
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self.extract_content = extract_content
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self.digest_format = digest_format.lower() if digest_format else None # Supported formats: html, pdf
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os.makedirs(os.path.expanduser(os.path.dirname(self.dbfile)), exist_ok=True)
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if headers is None:
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headers = {}
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headers['User-Agent'] = self.user_agent
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request_args = {
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'method': 'get',
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'url': self.url,
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'headers': headers,
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'params': params or {},
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}
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super().__init__(skip_first_call=False, args=request_args, *argv, **kwargs)
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def _get_or_create_source(self, session):
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record = session.query(FeedSource).filter_by(url=self.url).first()
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if record is None:
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record = FeedSource(url=self.url, title=self.title)
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session.add(record)
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session.commit()
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return record
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@staticmethod
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def _get_latest_update(session, source_id):
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return session.query(func.max(FeedEntry.published)).filter_by(source_id=source_id).scalar()
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def _parse_entry_content(self, link):
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self.logger.info('Extracting content from {}'.format(link))
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parser = get_plugin('http.webpage')
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response = parser.simplify(link)
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output = response.output
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errors = response.errors
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if not output:
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self.logger.warning('Mercury parser error: {}'.format(errors or '[unknown error]'))
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return
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return output.get('content')
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def get_new_items(self, response):
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import feedparser
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engine = create_engine('sqlite:///{}'.format(self.dbfile), connect_args={'check_same_thread': False})
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Base.metadata.create_all(engine)
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Session.configure(bind=engine)
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self._get_or_create_source(session=Session())
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feed = feedparser.parse(response.text)
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session = Session()
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source_record = self._get_or_create_source(session=session)
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session.add(source_record)
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parse_start_time = datetime.datetime.utcnow()
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entries = []
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latest_update = self._get_latest_update(session, source_record.id)
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if not self.title and 'title' in feed.feed:
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self.title = feed.feed['title']
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source_record.title = self.title
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content = u'''
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<h1 style="{title_style}">{title}</h1>
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<h2 style="{subtitle_style}">Feeds digest generated on {creation_date}</h2>'''.\
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format(title_style=self.title_style, title=self.title, subtitle_style=self.subtitle_style,
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creation_date=datetime.datetime.now().strftime('%d %B %Y, %H:%M'))
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self.logger.info('Parsed {:d} items from RSS feed <{}>'
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.format(len(feed.entries), self.url))
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for entry in feed.entries:
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if not entry.published_parsed:
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continue
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try:
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entry_timestamp = datetime.datetime(*entry.published_parsed[:6])
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if latest_update is None \
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or entry_timestamp > latest_update:
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self.logger.info('Processed new item from RSS feed <{}>'.format(self.url))
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entry.summary = entry.summary if hasattr(entry, 'summary') else None
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if self.extract_content:
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entry.content = self._parse_entry_content(entry.link)
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elif hasattr(entry, 'summary'):
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entry.content = entry.summary
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else:
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entry.content = None
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content += u'''
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<h1 style="{article_title_style}">
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<a href="{link}" target="_blank" style="{article_link_style}">{title}</a>
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</h1>
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<div class="_parsed-content" style="{article_content_style}">{content}</div>'''.format(
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article_title_style=self.article_title_style, article_link_style=self.article_link_style,
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article_content_style=self.article_content_style, link=entry.link, title=entry.title,
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content=entry.content)
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e = {
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'entry_id': entry.id,
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'title': entry.title,
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'link': entry.link,
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'summary': entry.summary,
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'content': entry.content,
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'source_id': source_record.id,
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'published': entry_timestamp,
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}
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entries.append(e)
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session.add(FeedEntry(**e))
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if self.max_entries and len(entries) > self.max_entries:
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break
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except Exception as e:
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self.logger.warning('Exception encountered while parsing RSS ' +
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'RSS feed {}: {}'.format(entry.link, str(e)))
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self.logger.exception(e)
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source_record.last_updated_at = parse_start_time
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digest_filename = None
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if entries:
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self.logger.info('Parsed {} new entries from the RSS feed {}'.format(
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len(entries), self.title))
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if self.digest_format:
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digest_filename = os.path.join(self.workdir, 'cache', '{}_{}.{}'.format(
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datetime.datetime.now().strftime('%Y-%m-%dT%H:%M:%S'),
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self.title, self.digest_format))
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os.makedirs(os.path.dirname(digest_filename), exist_ok=True)
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if self.digest_format == 'html':
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content = '''
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<html>
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<head>
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<title>{title}</title>
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</head>
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<body style="{body_style}">{content}</body>
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</html>
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'''.format(title=self.title, body_style=self.body_style, content=content)
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with open(digest_filename, 'w', encoding='utf-8') as f:
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f.write(content)
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elif self.digest_format == 'pdf':
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from weasyprint import HTML, CSS
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try:
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from weasyprint.fonts import FontConfiguration
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except ImportError:
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from weasyprint.document import FontConfiguration
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body_style = 'body { ' + self.body_style + ' }'
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font_config = FontConfiguration()
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css = [CSS('https://fonts.googleapis.com/css?family=Merriweather'),
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CSS(string=body_style, font_config=font_config)]
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HTML(string=content).write_pdf(digest_filename, stylesheets=css)
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else:
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raise RuntimeError('Unsupported format: {}. Supported formats: ' +
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'html or pdf'.format(self.digest_format))
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digest_entry = FeedDigest(source_id=source_record.id,
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format=self.digest_format,
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filename=digest_filename)
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session.add(digest_entry)
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self.logger.info('{} digest ready: {}'.format(self.digest_format, digest_filename))
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session.commit()
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self.logger.info('Parsing RSS feed {}: completed'.format(self.title))
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return NewFeedEvent(request=dict(self), response=entries,
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source_id=source_record.id,
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source_title=source_record.title,
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title=self.title,
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digest_format=self.digest_format,
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digest_filename=digest_filename)
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class FeedSource(Base):
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""" Models the FeedSource table, containing RSS sources to be parsed """
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__tablename__ = 'FeedSource'
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__table_args__ = ({'sqlite_autoincrement': True})
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id = Column(Integer, primary_key=True)
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title = Column(String)
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url = Column(String, unique=True)
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last_updated_at = Column(DateTime)
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class FeedEntry(Base):
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""" Models the FeedEntry table, which contains RSS entries """
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__tablename__ = 'FeedEntry'
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__table_args__ = ({'sqlite_autoincrement': True})
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id = Column(Integer, primary_key=True)
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entry_id = Column(String)
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source_id = Column(Integer, ForeignKey('FeedSource.id'), nullable=False)
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title = Column(String)
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link = Column(String)
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summary = Column(String)
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content = Column(String)
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published = Column(DateTime)
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class FeedDigest(Base):
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""" Models the FeedDigest table, containing feed digests either in HTML
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or PDF format """
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class DigestFormat(enum.Enum):
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html = 1
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pdf = 2
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__tablename__ = 'FeedDigest'
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__table_args__ = ({'sqlite_autoincrement': True})
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id = Column(Integer, primary_key=True)
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source_id = Column(Integer, ForeignKey('FeedSource.id'), nullable=False)
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format = Column(Enum(DigestFormat), nullable=False)
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filename = Column(String, nullable=False)
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created_at = Column(DateTime, nullable=False, default=datetime.datetime.utcnow)
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# vim:sw=4:ts=4:et:
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