148 lines
4.6 KiB
Python
148 lines
4.6 KiB
Python
import datetime
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import feedparser
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import logging
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import os
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import requests
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import time
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from sqlalchemy import create_engine, Column, Integer, String, DateTime, \
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UniqueConstraint, 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 platypush.backend.http.request import HttpRequest
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from platypush.config import Config
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from platypush.message.event.http.rss import NewFeedEvent
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from platypush.utils import mkdir_p
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Base = declarative_base()
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Session = scoped_session(sessionmaker())
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class GetRssUpdates(HttpRequest):
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""" Gets new items in an RSS feed """
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dbfile = os.path.join(os.path.expanduser(Config.get('workdir')), 'feeds', 'rss.db')
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def __init__(self, url, headers=None, params=None, dbfile=None,
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mercury_api_key=None, *args, **kwargs):
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self.url = url
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self.mercury_api_key = mercury_api_key # Mercury Reader API used to parse the content of the link
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if dbfile: self.dbfile = dbfile
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mkdir_p(os.path.dirname(self.dbfile))
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self.engine = create_engine('sqlite:///{}'.format(self.dbfile))
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Base.metadata.create_all(self.engine)
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Session.configure(bind=self.engine)
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self._get_or_create_source(session=Session())
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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 or {},
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'params': params or {},
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}
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super().__init__(*args, skip_first_call=False, args=request_args, **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)
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session.add(record)
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session.commit()
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return record
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def _parse_entry_content(self, link):
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response = None
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try:
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logging.info('Parsing content for {}'.format(link))
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response = requests.get('https://mercury.postlight.com/parser',
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params = {'url': link},
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headers = {'x-api-key': self.mercury_api_key })
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except Exception as e: logging.exception(e)
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return response.json()['content'] if response and response.ok else None
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def get_new_items(self, response):
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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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last_updated_at = source_record.last_updated_at
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if source_record.title != feed.feed['title']:
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source_record.title = feed.feed['title']
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for entry in feed.entries:
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entry_timestamp = datetime.datetime(*entry.published_parsed[:6])
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if last_updated_at is None: last_updated_at = entry_timestamp
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if source_record.last_updated_at is None \
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or entry_timestamp > source_record.last_updated_at:
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last_updated_at = max(entry_timestamp, last_updated_at)
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entry.content = self._parse_entry_content(entry.link) \
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if self.mercury_api_key else None
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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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source_record.last_updated_at = parse_start_time
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session.commit()
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if entries:
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logging.info('Parsed {} new entries from the RSS feed {}'.format(
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len(entries), source_record.title))
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return NewFeedEvent(dict(self), entries)
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class FeedSource(Base):
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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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__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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# vim:sw=4:ts=4:et:
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