commit a302c9c50b28ab64ebf7377c46d3a6565d01c72b · edavis.dev/bsky-tools

+2 -5

feedgen.py

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       import websockets

     

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       from feed_manager import feed_manager

     

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       from firehose_manager import FirehoseManager

     

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       logging.basicConfig(

     

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           format='%(asctime)s - %(levelname)-5s - %(name)-20s - %(message)s',

     
···

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       logging.getLogger('feeds').setLevel(logging.DEBUG)

     

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       logging.getLogger('firehose').setLevel(logging.DEBUG)

     

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       async def firehose_events(firehose_manager):

     

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       async def firehose_events():

     

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           relay_url = 'ws://localhost:6008/subscribe'

     

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           logger = logging.getLogger('feeds.events')

     
···

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                   yield json.load(payload)

     

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       async def main():

     

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           firehose_manager = FirehoseManager()

     

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           event_count = 0

     

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           async for commit in firehose_events(firehose_manager):

     

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           async for commit in firehose_events():

     

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               feed_manager.process_commit(commit)

     

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               event_count += 1

     

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               if event_count % 2500 == 0:

     

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                   feed_manager.commit_changes()

     

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                   firehose_manager.set_sequence_number(commit['seq'])

     

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       if __name__ == '__main__':

     

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           asyncio.run(main())

+118 -24

feeds/mostliked.py

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       import apsw

     

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       import apsw.ext

     

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       import threading

     

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       import queue

     

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       from . import BaseFeed

     

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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 not self.stop_signal:

     

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

     

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                   if task == 'STOP':

     

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                       self.stop_signal = True

     

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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.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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           SERVE_FEED_QUERY = """

     

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           select uri, create_ts, unixepoch('now', '-24 hours'), create_ts - unixepoch('now', '-24 hours'), likes

     

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           from posts

     

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           where create_ts >= unixepoch('now', '-24 hours')

     

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           order by likes desc, create_ts asc

     

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           limit :limit offset :offset

     

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           """

     

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           DELETE_OLD_POSTS_QUERY = """

     

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           delete from posts

     

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           where create_ts < unixepoch('now', '-24 hours')

     

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           delete from posts where (

     

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             create_ts < unixepoch('now', '-15 minutes') and likes < 2

     

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           ) or 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, create_ts timestamp, likes int

     

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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 unique index if not exists uri_idx on posts(uri);

     

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

     

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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.db_writes = queue.Queue()

     

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

     

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               db_worker.start()

     

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           def process_commit(self, commit):

     

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               return

     

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

     

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                   return

     

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           def delete_old_posts(self):

     

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               self.db_cnx.execute(self.DELETE_OLD_POSTS_QUERY)

     

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               self.logger.debug('deleted {} old posts'.format(self.db_cnx.changes()))

     

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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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                   task = (

     

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                       'insert or ignore into posts (uri, create_ts, likes) values (:uri, :ts, 0)',

     

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                       {'uri': post_uri, 'ts': self.safe_timestamp(record.get('createdAt')).timestamp()}

     

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                   )

     

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                   self.db_writes.put(task)

     

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

     

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                   for lang in 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': post_uri, 'lang': lang}

     

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                       )

     

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                       self.db_writes.put(task)

     

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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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                   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.delete_old_posts()

     

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               self.logger.debug('committing changes')

     

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               self.transaction_commit(self.db_cnx)

     

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               self.wal_checkpoint(self.db_cnx, 'RESTART')

     

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

     

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               bindings = []

     

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               sql = """

     

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               select posts.uri, create_ts, create_ts - unixepoch('now', '-15 minutes') as rem, likes, lang

     

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               from posts

     

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               left join langs on posts.uri = langs.uri

     

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               where

     

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               """

     

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               if not '*' in langs:

     

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                   lang_values = list(langs.values())

     

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                   bindings.extend(lang_values)

     

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                   sql += " OR ".join(['lang = ?'] * len(lang_values))

     

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               else:

     

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                   sql += " 1=1 "

     

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               sql += """

     

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               order by likes desc, create_ts desc

     

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               limit ? offset ?

     

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               """

     

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               bindings.extend([limit, offset])

     

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               return sql, bindings

     

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

     

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               return [

     

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                   'at://did:plc:4nsduwlpivpuur4mqkbfvm6a/app.bsky.feed.post/3l3cgg5vbc72i'

     

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               ]

     

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               sql, bindings = self.generate_sql(limit, offset, langs)

     

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               cur = self.db_cnx.execute(sql, bindings)

     

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               return [row[0] for row in cur]

     

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

     

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               pass

     

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               sql, bindings = self.generate_sql(limit, offset, langs)

     

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               return apsw.ext.format_query_table(

     

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                   self.db_cnx, sql, bindings,

     

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                   string_sanitize=2, text_width=9999, use_unicode=True

     

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               )

-30

firehose_manager.py

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       import logging

     

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       import apsw

     

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       class FirehoseManager:

     

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           def __init__(self, fname='db/firehose.db'):

     

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               self.db_cnx = apsw.Connection(fname)

     

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

     

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               with self.db_cnx:

     

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                   self.db_cnx.execute("create table if not exists firehose(key text unique, value text)")

     

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               self.logger = logging.getLogger('firehose.manager')

     

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           def get_sequence_number(self):

     

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               row = self.db_cnx.execute("select * from firehose where key = 'seq'").fetchone()

     

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               if row is None:

     

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                   return None

     

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               (key, value) = row

     

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               return int(value)

     

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           def set_sequence_number(self, value):

     

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               self.logger.debug(f'setting sequence number = {value}')

     

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               with self.db_cnx:

     

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                   self.db_cnx.execute(

     

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                       "insert into firehose (key, value) values ('seq', :value) on conflict(key) do update set value = :value",

     

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                       dict(value=value)

     

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                   )

     

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               self.db_cnx.pragma('wal_checkpoint(RESTART)')