238 lines
8.8 KiB
Python
238 lines
8.8 KiB
Python
import datetime
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import enum
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import feedparser
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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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""" Gets new items in an RSS feed """
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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, *argv, **kwargs):
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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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# 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).output
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errors = parser.simplify(link).errors
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if not response:
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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 response.get('content')
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def get_new_items(self, response):
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engine = create_engine('sqlite:///{}'.format(self.dbfile),
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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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digest = u'''
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<h1 style="margin-top: 30px">{}</h1>
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<h2 style="margin-top: 10px; page-break-after: always">
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Feeds digest generated on {} </h2>'''.format(self.title,
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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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digest += '<h1 style="page-break-before: always">{}</h1>{}' \
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.format(entry.title, 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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with open(digest_filename, 'w', encoding='utf-8') as f:
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f.write(digest)
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elif self.digest_format == 'pdf':
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import weasyprint
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weasyprint.HTML(string=digest).write_pdf(digest_filename)
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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, 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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