61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
from logging import Logger
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from rss import RssReader, FeedItem
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from database import Database
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from telegram import Notifier
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class UpdateManager:
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"""Implement the feed update."""
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def __init__(self, database: Database, notifier: Notifier, rss_reader: RssReader, logger: Logger) -> None:
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self.log: Logger = logger
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self.log.debug(
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'UpdateManager.__init__(database=%s, notifier=%s, rss_reader=%s, logger=%s)',
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database, notifier, rss_reader, logger
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)
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self.database: Database = database
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self.notifier: Notifier = notifier
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self.rss_reader: RssReader = rss_reader
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def update(self):
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"""Send new feed items to the user."""
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self.log.info('Running update')
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feeds = self.database.find_feeds()
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self.log.info('Feeds to update: %d', len(feeds))
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for feed_id, feed_url in feeds:
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self.log.info('Processing [%d] %s', feed_id, feed_url)
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feed = self.rss_reader.get_feed(feed_url)
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new_items = feed.items
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old_items_urls = self.database.find_feed_items_urls(feed_id)
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diff = self.__calculate_difference(new_items, old_items_urls)
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if not diff:
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continue
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chat_ids = self.database.find_feed_subscribers(feed_id)
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self.notifier.send_updates(chat_ids, diff, feed.title)
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self.database.update_feed_items(feed_id, new_items)
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def __calculate_difference(self, new_items: list[FeedItem], old_items_urls: list[str]) -> list[FeedItem]:
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"""Calculate new feed items."""
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self.log.debug(
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'__calculate_difference(new_items=list(%d), old_items_urls=list(%d))', len(new_items), len(old_items_urls)
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)
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if not old_items_urls:
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self.log.debug('Old items are empty, returning new')
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return new_items
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diff = []
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self.log.debug('Comparing %d new items with %d old', len(new_items), len(old_items_urls))
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for item in new_items:
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if item.url not in old_items_urls:
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diff.append(item)
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self.log.debug('%d updates found', len(diff))
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return diff
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