from celery import Celery, Task from app import app as flaskapp from app import db from model import Session, Account, TwitterArchive, Post, OAuthToken,\ MastodonInstance import libforget.twitter import libforget.mastodon from datetime import timedelta, datetime, timezone from zipfile import ZipFile from io import BytesIO, TextIOWrapper import json from kombu import Queue import random import version from libforget.exceptions import PermanentError, TemporaryError import redis from functools import wraps import pickle app = Celery('tasks', broker=flaskapp.config['CELERY_BROKER'], task_serializer='pickle') app.conf.task_queues = ( Queue('default', routing_key='celery'), Queue('high_prio', routing_key='high'), Queue('higher_prio', routing_key='higher'), ) app.conf.task_default_queue = 'default' app.conf.task_default_exchange = 'celery' app.conf.task_default_exchange_type = 'direct' sentry = None if 'SENTRY_DSN' in flaskapp.config: from raven import Client from raven.contrib.celery import register_signal, register_logger_signal sentry = Client(flaskapp.config['SENTRY_DSN'], release=version.version) register_logger_signal(sentry) register_signal(sentry) class DBTask(Task): def __call__(self, *args, **kwargs): try: super().__call__(*args, **kwargs) finally: db.session.close() app.Task = DBTask r = None def unique(fun): global r if not r: r = redis.StrictRedis.from_url(flaskapp.config['REDIS_URI']) @wraps(fun) def wrapper(*args, **kwargs): key = 'celery_unique_lock:{}'.format(pickle.dumps((fun.__name__, args, kwargs))) has_lock = False try: if r.set(key, 1, nx=True, ex=60*5): has_lock = True return fun(*args, **kwargs) finally: if has_lock: r.delete(key) return wrapper def noop(*args, **kwargs): pass def make_dormant(acc): acc.reason = ''' Your account was temporarily disabled because your {service} account was suspended or otherwise inaccessible. By logging into it, you have reactivated your account, but be aware that some posts may be missing from Forget's database, and it may take some time to get back in sync. '''.format(service=acc.service) acc.dormant = True db.session.commit() @app.task(autoretry_for=(TemporaryError,)) @unique def fetch_acc(id_, cursor=None): acc = Account.query.get(id_) print(f'fetching {acc}') try: action = noop if(acc.service == 'twitter'): action = libforget.twitter.fetch_acc elif(acc.service == 'mastodon'): action = libforget.mastodon.fetch_acc cursor = action(acc, cursor) if cursor: fetch_acc.si(id_, cursor).apply_async() except PermanentError: db.session.rollback() make_dormant(acc) if sentry: sentry.captureException() finally: db.session.rollback() acc.touch_fetch() db.session.commit() @app.task() def import_twitter_archive_month(archive_id, month_path): ta = TwitterArchive.query.get(archive_id) try: with ZipFile(BytesIO(ta.body), 'r') as zipfile: with TextIOWrapper(zipfile.open(month_path, 'r')) as f: # seek past header f.readline() tweets = json.load(f) for tweet in tweets: post = libforget.twitter.post_from_api_tweet_object(tweet) existing_post = db.session.query(Post).get(post.id) if post.author_id != ta.account_id or\ existing_post and existing_post.author_id != ta.account_id: raise Exception("Shenanigans!") post = db.session.merge(post) ta.chunks_successful = TwitterArchive.chunks_successful + 1 db.session.commit() except Exception as e: db.session.rollback() ta.chunks_failed = TwitterArchive.chunks_failed + 1 db.session.commit() raise e @app.task() @unique def delete_from_account(account_id): account = Account.query.get(account_id) if account.next_delete > datetime.now(timezone.utc): return latest_n_posts = (Post.query.with_parent(account) .order_by(db.desc(Post.created_at)) .limit(account.policy_keep_latest) .cte(name='latest')) posts = ( Post.query.with_parent(account) .filter( Post.created_at + account.policy_keep_younger <= db.func.now()) .filter(~Post.id.in_(db.select((latest_n_posts.c.id,)))) .order_by(db.func.random()) .limit(100).with_for_update().all()) to_delete = None action = noop if account.service == 'twitter': action = libforget.twitter.delete posts = refresh_posts(posts) if posts: eligible = list(( # nosec post for post in posts if (not account.policy_keep_favourites or not post.favourite) and (not account.policy_keep_media or not post.has_media) )) if eligible: to_delete = random.choice(eligible) elif account.service == 'mastodon': action = libforget.mastodon.delete for post in posts: refreshed = refresh_posts((post,)) if refreshed and \ (not account.policy_keep_favourites or not post.favourite) \ and (not account.policy_keep_media or not post.has_media)\ and (not account.policy_keep_direct or not post.direct): to_delete = refreshed[0] break if to_delete: print("deleting {}".format(to_delete)) account.touch_delete() action(to_delete) else: account.next_delete = db.func.now() + timedelta(minutes=3) db.session.commit() def refresh_posts(posts): posts = list(posts) if len(posts) == 0: return [] if posts[0].service == 'twitter': return libforget.twitter.refresh_posts(posts) elif posts[0].service == 'mastodon': return libforget.mastodon.refresh_posts(posts) @app.task() @unique def refresh_account(account_id): account = Account.query.get(account_id) try: limit = 100 if account.service == 'mastodon': limit = 3 posts = (Post.query.with_parent(account) .order_by(db.asc(Post.updated_at)).limit(limit).all()) posts = refresh_posts(posts) account.touch_refresh() db.session.commit() except PermanentError: db.session.rollback() make_dormant(account) if sentry: sentry.captureException() @app.task @unique def periodic_cleanup(): # delete sessions after 48 hours (Session.query .filter(Session.updated_at < (db.func.now() - timedelta(hours=48))) .delete(synchronize_session=False)) # delete twitter archives after 3 days (TwitterArchive.query .filter(TwitterArchive.updated_at < (db.func.now() - timedelta(days=3))) .delete(synchronize_session=False)) # delete anonymous oauth tokens after 1 day (OAuthToken.query .filter(OAuthToken.updated_at < (db.func.now() - timedelta(days=1))) .filter(OAuthToken.account_id == None) # noqa: E711 .delete(synchronize_session=False)) # disable and log out users with no tokens unreachable = ( Account.query .outerjoin(Account.tokens) .group_by(Account).having(db.func.count(OAuthToken.token) == 0) .filter(Account.policy_enabled == True)) # noqa: E712 for account in unreachable: account.force_log_out() account.policy_enabled = False account.reason = """ Your account was disabled because Forget no longer had access to your {service} account. Perhaps you had revoked it? By logging in, you have restored access and you can now re-enable Forget if you wish. """.format(service=account.service.capitalize()) db.session.commit() @app.task @unique def queue_fetch_for_most_stale_accounts( min_staleness=timedelta(minutes=2), limit=20): accs = (Account.query .join(Account.tokens).group_by(Account) .filter(Account.last_fetch < db.func.now() - min_staleness) .filter(~Account.dormant) .order_by(db.asc(Account.last_fetch)) .limit(limit) ) for acc in accs: fetch_acc.s(acc.id).delay() db.session.commit() @app.task @unique def queue_deletes(): eligible_accounts = ( Account.query.filter(Account.policy_enabled == True) # noqa: E712 .filter(Account.next_delete < db.func.now()) .filter(~Account.dormant)) for account in eligible_accounts: delete_from_account.s(account.id).apply_async() @app.task @unique def refresh_account_with_oldest_post(): post = (Post.query.outerjoin(Post.author).join(Account.tokens) .filter(~Account.dormant) .group_by(Post).order_by(db.asc(Post.updated_at)).first()) refresh_account(post.author_id) @app.task @unique def refresh_account_with_longest_time_since_refresh(): acc = (Account.query.join(Account.tokens).group_by(Account) .filter(~Account.dormant) .order_by(db.asc(Account.last_refresh)).first()) refresh_account(acc.id) @app.task def update_mastodon_instances_popularity(): # bump score for each active account for acct in ( Account.query .options(db.joinedload(Account.sessions)) .filter(~Account.dormant) .filter(Account.id.like('mastodon:%'))): instance = MastodonInstance.query.get(acct.mastodon_instance) if not instance: instance = MastodonInstance(instance=acct.mastodon_instance, popularity=10) db.session.add(instance) amount = 0.001 if acct.policy_enabled: amount = 0.01 for session in Account.sessions: amount += 0.01 instance.bump(amount / instance.popularity) # normalise scores so the median is 10 median_pop = ( db.session.query( db.func.percentile_cont(0.5) .within_group(MastodonInstance.popularity.desc())).scalar() ) MastodonInstance.query.update({ MastodonInstance.popularity: MastodonInstance.popularity * 10 / median_pop }) db.session.commit() app.add_periodic_task(120, periodic_cleanup) app.add_periodic_task(40, queue_fetch_for_most_stale_accounts) app.add_periodic_task(17, queue_deletes) app.add_periodic_task(60, refresh_account_with_oldest_post) app.add_periodic_task(180, refresh_account_with_longest_time_since_refresh) app.add_periodic_task(61, update_mastodon_instances_popularity) if __name__ == '__main__': app.worker_main()