commit 45c4877bf2cb0432157d0e0eb98ae1c6eeac010d · edavis.dev/bsky-tools

-5

feed_manager.py

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                       pass

     

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       feed_manager = FeedManager()

     

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       feed_manager.register(RapidFireFeed)

     

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       feed_manager.register(PopularFeed)

     

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       feed_manager.register(HomeRunsTeamFeed)

     

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       feed_manager.register(NoraZoneInteresting)

     

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       feed_manager.register(SevenDirtyWordsFeed)

     

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       feed_manager.register(MostLikedFeed)

     

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       # feed_manager.register(PopularQuotePostsFeed)

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feeds/mostliked.py

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       import apsw

     

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       import apsw.ext

     

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       from expiringdict import ExpiringDict

     

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       import threading

     

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       import queue

     

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       from . import BaseFeed

     

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       # store post in database once it has this many likes

     

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       MIN_LIKES = 5

     

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       class DatabaseWorker(threading.Thread):

     

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           def __init__(self, name, db_path, task_queue):

     

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               super().__init__()

     

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               self.db_cnx = apsw.Connection(db_path)

     

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               self.db_cnx.pragma('foreign_keys', True)

     

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               self.db_cnx.pragma('journal_mode', 'WAL')

     

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               self.db_cnx.pragma('wal_autocheckpoint', '0')

     

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               self.stop_signal = False

     

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               self.task_queue = task_queue

     

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               self.logger = logging.getLogger(f'feeds.db.{name}')

     

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               self.changes = 0

     

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           def run(self):

     

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               while True:

     

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                   task = self.task_queue.get(block=True)

     

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                   if task == 'STOP':

     

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                       self.logger.debug('received STOP, breaking now')

     

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                       break

     

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                   elif task == 'COMMIT':

     

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                       self.logger.debug(f'committing {self.changes} changes')

     

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                       if self.db_cnx.in_transaction:

     

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                           self.db_cnx.execute('COMMIT')

     

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                           checkpoint = self.db_cnx.execute('PRAGMA wal_checkpoint(PASSIVE)')

     

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                           self.logger.debug(f'checkpoint: {checkpoint.fetchall()!r}')

     

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                           self.changes = 0

     

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                       self.logger.debug(f'qsize: {self.task_queue.qsize()}')

     

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                   else:

     

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                       sql, bindings = task

     

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                       if not self.db_cnx.in_transaction:

     

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                           self.db_cnx.execute('BEGIN')

     

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                       self.db_cnx.execute(sql, bindings)

     

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                       self.changes += self.db_cnx.changes()

     

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                   self.task_queue.task_done()

     

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               self.logger.debug('closing database connection')

     

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               self.db_cnx.close()

     

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           def stop(self):

     

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               self.task_queue.put('STOP')

     

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       class MostLikedFeed(BaseFeed):

     

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           FEED_URI = 'at://did:plc:4nsduwlpivpuur4mqkbfvm6a/app.bsky.feed.generator/most-liked'

     

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           DELETE_OLD_POSTS_QUERY = """

     

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           delete from posts where create_ts < unixepoch('now', '-24 hours');

     

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           """

     

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           def __init__(self):

     

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               self.db_cnx = apsw.Connection('db/mostliked.db')

     

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               self.db_cnx.pragma('foreign_keys', True)

     

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               self.db_cnx.pragma('journal_mode', 'WAL')

     

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               self.db_cnx.pragma('wal_autocheckpoint', '0')

     

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               with self.db_cnx:

     

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                   self.db_cnx.execute("""

     

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                   create table if not exists posts (

     

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                     uri text primary key,

     

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                     create_ts timestamp,

     

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                     likes int

     

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                   );

     

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                   create table if not exists langs (

     

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                     uri text,

     

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                     lang text,

     

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                     foreign key(uri) references posts(uri) on delete cascade

     

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                   );

     

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                   create index if not exists ts_idx on posts(create_ts);

     

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                   """)

     

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               self.logger = logging.getLogger('feeds.mostliked')

     

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               self.drafts = ExpiringDict(max_len=50_000, max_age_seconds=5*60)

     

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               self.db_writes = queue.Queue()

     

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               self.db_worker = DatabaseWorker('mostliked', 'db/mostliked.db', self.db_writes)

     

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               self.db_worker.start()

     

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           def stop_db_worker(self):

     

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               self.logger.debug('sending STOP')

     

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               self.db_writes.put('STOP')

     

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           def process_commit(self, commit):

     

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               if commit['opType'] != 'c':

     

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                   return

     

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               if commit['collection'] == 'app.bsky.feed.post':

     

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                   record = commit.get('record')

     

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                   post_uri = f"at://{commit['did']}/app.bsky.feed.post/{commit['rkey']}"

     

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                   # to keep the DB in check, instead of adding every post right away

     

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                   # we make note of it but only add to DB once it gets some likes

     

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                   self.drafts[post_uri] = {

     

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                       'ts': self.safe_timestamp(record.get('createdAt')).timestamp(),

     

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                       'langs': record.get('langs', []),

     

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                       'likes': 0,

     

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                   }

     

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               elif commit['collection'] == 'app.bsky.feed.like':

     

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                   record = commit.get('record')

     

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                   try:

     

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                       subject_uri = record['subject']['uri']

     

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                   except KeyError:

     

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                       return

     

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                   if subject_uri in self.drafts:

     

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                       record_info = self.drafts.pop(subject_uri).copy()

     

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                       record_info['likes'] += 1

     

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                       if record_info['likes'] < MIN_LIKES:

     

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                           self.drafts[subject_uri] = record_info

     

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                           return

     

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                       self.logger.debug(f'graduating {subject_uri}')

     

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                       task = (

     

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                           'insert or ignore into posts (uri, create_ts, likes) values (:uri, :ts, :likes)',

     

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                           {'uri': subject_uri, 'ts': record_info['ts'], 'likes': record_info['likes']}

     

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                       )

     

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                       self.db_writes.put(task)

     

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                       for lang in record_info['langs']:

     

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                           task = (

     

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                               'insert or ignore into langs (uri, lang) values (:uri, :lang)',

     

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                               {'uri': subject_uri, 'lang': lang}

     

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                           )

     

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                           self.db_writes.put(task)

     

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                   subject_exists = self.db_cnx.execute('select 1 from posts where uri = ?', [subject_uri])

     

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                   if subject_exists.fetchone() is None:

     

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                       return

     

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                   task = (

     

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                       'update posts set likes = likes + 1 where uri = :uri',

     

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                       {'uri': subject_uri}

     

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                   )

     

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                   self.db_writes.put(task)

     

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           def commit_changes(self):

     

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               self.db_writes.put((self.DELETE_OLD_POSTS_QUERY, {}))

     

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               self.db_writes.put('COMMIT')

     

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               self.logger.debug(f'there are {len(self.drafts)} drafts')

     

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           def generate_sql(self, limit, offset, langs):

     

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               bindings = []