440 lines
14 KiB
Python
440 lines
14 KiB
Python
from celery import Celery, Task
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from app import app as flaskapp
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from app import db
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from model import Session, Account, TwitterArchive, Post, OAuthToken,\
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MastodonInstance
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import libforget.twitter
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import libforget.mastodon
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from datetime import timedelta, datetime, timezone
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from zipfile import ZipFile
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from io import BytesIO, TextIOWrapper
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import json
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from kombu import Queue
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import version
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from libforget.exceptions import PermanentError, TemporaryError
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import redis
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from functools import wraps
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import pickle
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app = Celery(
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'tasks',
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broker=flaskapp.config['CELERY_BROKER'],
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task_serializer='pickle',
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task_soft_time_limit=600,
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task_time_limit=1200,
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)
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app.conf.task_queues = (
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Queue('default', routing_key='celery'),
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Queue('high_prio', routing_key='high'),
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Queue('higher_prio', routing_key='higher'),
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)
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app.conf.task_default_queue = 'default'
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app.conf.task_default_exchange = 'celery'
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app.conf.task_default_exchange_type = 'direct'
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sentry = None
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if 'SENTRY_DSN' in flaskapp.config:
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from raven import Client
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from raven.contrib.celery import register_signal, register_logger_signal
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sentry = Client(
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flaskapp.config['SENTRY_DSN'],
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release=version.get_versions()['version'])
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register_logger_signal(sentry)
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register_signal(sentry)
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class DBTask(Task):
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def __call__(self, *args, **kwargs):
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try:
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super().__call__(*args, **kwargs)
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finally:
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db.session.close()
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app.Task = DBTask
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r = None
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def unique(fun):
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global r
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if not r:
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r = redis.StrictRedis.from_url(flaskapp.config['REDIS_URI'])
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@wraps(fun)
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def wrapper(*args, **kwargs):
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key = 'celery_unique_lock:{}'.format(
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pickle.dumps((fun.__name__, args, kwargs)))
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has_lock = False
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result = None
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try:
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if r.set(key, 1, nx=True, ex=60 * 5):
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has_lock = True
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result = fun(*args, **kwargs)
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finally:
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if has_lock:
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r.delete(key)
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return result
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return wrapper
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def noop(*args, **kwargs):
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pass
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def make_dormant(acc):
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acc.reason = '''
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Your account was temporarily disabled because your {service}
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account was suspended or otherwise inaccessible. By logging into
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it, you have reactivated your account, but be aware that some posts
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may be missing from Forget's database, and it may take some time to
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get back in sync.
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'''.format(service=acc.service)
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acc.dormant = True
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@app.task(autoretry_for=(TemporaryError, ))
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def fetch_acc(id_):
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account = Account.query.get(id_)
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print(f'fetching {account}')
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try:
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if not account.fetch_history_complete:
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oldest = (db.session.query(Post)
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.with_parent(account, 'posts')
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.order_by(db.asc(Post.created_at))
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.first())
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# ^ None if this is our first fetch ever, otherwise the oldest post
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if oldest:
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max_id = oldest.remote_id
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else:
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max_id = None
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since_id = None
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elif account.fetch_current_batch_end:
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oldest = (db.session.query(Post)
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.with_parent(account, 'posts')
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.filter(Post.created_at > account.fetch_current_batch_end.created_at)
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.order_by(db.asc(Post.created_at))
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.first())
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# ^ None if this is our first fetch of this batch, otherwise oldest of this batch
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if oldest:
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max_id = oldest.remote_id
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else:
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max_id = None
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since_id = account.fetch_current_batch_end.remote_id
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else:
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# we shouldn't get here unless the user had no posts on the service last time we fetched
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max_id = None
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latest = (db.session.query(Post)
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.with_parent(account, 'posts')
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.order_by(db.desc(Post.created_at))
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.limit(1)
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.scalar())
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# ^ should be None considering the user has no posts
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# will be the latest post in the off chance that something goes weird
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if latest:
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since_id = latest.remote_id
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else:
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since_id = None
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print('max_id: {}, since_id: {}'.format(max_id, since_id))
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fetch_posts = noop
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if (account.service == 'twitter'):
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fetch_posts = libforget.twitter.fetch_posts
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elif (account.service == 'mastodon'):
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fetch_posts = libforget.mastodon.fetch_posts
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posts = fetch_posts(account, max_id, since_id)
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if posts is None:
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# ???
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raise TemporaryError("Fetching posts went horribly wrong")
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if len(posts) == 0:
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# we either finished the historic fetch
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# or we finished the current batch
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account.fetch_history_complete = True
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account.fetch_current_batch_end_id = (Post.query
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.with_parent(account, 'posts').order_by(db.desc(Post.created_at)).first()).id
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# ^ note that this could be None if the user has no posts
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# this is okay
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db.session.commit()
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else:
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for post in posts:
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db.session.merge(post)
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db.session.commit()
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if not account.fetch_history_complete:
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# reschedule immediately if we're still doing the historic fetch
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fetch_acc.apply_async((id_,))
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except TemporaryError:
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db.session.rollback()
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account.backoff()
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except PermanentError:
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db.session.rollback()
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make_dormant(account)
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if sentry:
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sentry.captureException()
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finally:
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db.session.rollback()
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account.touch_fetch()
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db.session.commit()
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@app.task()
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def import_twitter_archive_month(archive_id, month_path):
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ta = TwitterArchive.query.get(archive_id)
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try:
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with ZipFile(BytesIO(ta.body), 'r') as zipfile:
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with TextIOWrapper(zipfile.open(month_path, 'r')) as f:
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# seek past header
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f.readline()
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tweets = json.load(f)
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for tweet in tweets:
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post = libforget.twitter.post_from_api_tweet_object(tweet)
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existing_post = db.session.query(Post).get(post.id)
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if post.author_id != ta.account_id or\
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existing_post and existing_post.author_id != ta.account_id:
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raise Exception("Shenanigans!")
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post = db.session.merge(post)
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ta.chunks_successful = TwitterArchive.chunks_successful + 1
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db.session.commit()
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except Exception as e:
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db.session.rollback()
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ta.chunks_failed = TwitterArchive.chunks_failed + 1
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db.session.commit()
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raise e
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@app.task()
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@unique
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def delete_from_account(account_id):
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account = Account.query.get(account_id)
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if account.next_delete > datetime.now(timezone.utc):
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return
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latest_n_posts = (Post.query.with_parent(account, 'posts').order_by(
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db.desc(Post.created_at)).limit(account.policy_keep_latest)
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.cte(name='latest'))
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posts = (
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Post.query.with_parent(account, 'posts')
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.filter(Post.created_at + account.policy_keep_younger <= db.func.now())
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.filter(~Post.id.in_(db.select((latest_n_posts.c.id, )))).order_by(
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db.func.random()).limit(100).with_for_update().all())
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to_delete = None
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def is_eligible(post):
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return (post.is_reblog or (
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(account.policy_keep_favourites == 'none' or
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(account.policy_keep_favourites == 'keeponly'
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and not post.favourite) or
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(account.policy_keep_favourites == 'deleteonly'
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and post.favourite)) and
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(account.policy_keep_media == 'none' or
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(account.policy_keep_media == 'keeponly' and not post.has_media)
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or (account.policy_keep_media == 'deleteonly' and post.has_media))
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and (not account.policy_keep_direct or not post.direct)))
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try:
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action = noop
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if account.service == 'twitter':
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action = libforget.twitter.delete
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posts = refresh_posts(posts)
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to_delete = next(filter(is_eligible, posts), None)
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elif account.service == 'mastodon':
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action = libforget.mastodon.delete
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for post in posts:
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refreshed = refresh_posts((post, ))
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if refreshed and is_eligible(refreshed[0]):
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to_delete = refreshed[0]
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break
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if to_delete:
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print("deleting {}".format(to_delete))
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account.touch_delete()
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action(to_delete)
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account.reset_backoff()
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else:
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account.next_delete = db.func.now() + timedelta(minutes=3)
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except TemporaryError:
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db.session.rollback()
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account.backoff()
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finally:
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db.session.commit()
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def refresh_posts(posts):
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posts = list(posts)
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if len(posts) == 0:
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return []
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if posts[0].service == 'twitter':
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return libforget.twitter.refresh_posts(posts)
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elif posts[0].service == 'mastodon':
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return libforget.mastodon.refresh_posts(posts)
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@app.task()
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@unique
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def refresh_account(account_id):
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account = Account.query.get(account_id)
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try:
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limit = 100
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if account.service == 'mastodon':
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limit = 3
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posts = (Post.query.with_parent(account, 'posts').order_by(
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db.asc(Post.updated_at)).limit(limit).all())
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posts = refresh_posts(posts)
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account.touch_refresh()
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account.reset_backoff()
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except TemporaryError:
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db.session.rollback()
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account.backoff()
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except PermanentError:
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db.session.rollback()
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make_dormant(account)
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if sentry:
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sentry.captureException()
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finally:
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db.session.commit()
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@app.task
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@unique
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def periodic_cleanup():
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# delete sessions after 48 hours
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(Session.query.filter(
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Session.updated_at < (db.func.now() - timedelta(hours=48)))
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.delete(synchronize_session=False))
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# delete twitter archives after 3 days
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(TwitterArchive.query.filter(
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TwitterArchive.updated_at < (db.func.now() - timedelta(days=3)))
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.delete(synchronize_session=False))
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# delete anonymous oauth tokens after 1 day
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(OAuthToken.query.filter(
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OAuthToken.updated_at < (db.func.now() - timedelta(days=1))).filter(
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OAuthToken.account_id == None) # noqa: E711
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.delete(synchronize_session=False))
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# disable and log out users with no tokens
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unreachable = (
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Account.query.outerjoin(Account.tokens)
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.group_by(Account).having(db.func.count(OAuthToken.token) == 0)
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.filter(Account.policy_enabled == True)) # noqa: E712
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for account in unreachable:
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account.force_log_out()
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account.policy_enabled = False
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account.reason = """
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Your account was disabled because Forget no longer had access to
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your {service} account. Perhaps you had revoked it? By logging in,
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you have restored access and you can now re-enable Forget if you wish.
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""".format(service=account.service.capitalize())
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db.session.commit()
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@app.task
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@unique
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def queue_fetch_for_most_stale_accounts(
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min_staleness=timedelta(minutes=2), limit=20):
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accs = (Account.query.join(Account.tokens).group_by(Account)
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.filter(Account.last_fetch < db.func.now() - min_staleness)
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.filter(Account.backoff_until < db.func.now())
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.filter(~Account.dormant).order_by(db.asc(
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Account.last_fetch)).limit(limit))
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for acc in accs:
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fetch_acc.s(acc.id).delay()
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db.session.commit()
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@app.task
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@unique
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def queue_deletes():
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eligible_accounts = (
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Account.query.filter(Account.policy_enabled == True) # noqa: E712
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.filter(Account.next_delete < db.func.now())
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.filter(Account.backoff_until < db.func.now())
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.filter(~Account.dormant))
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for account in eligible_accounts:
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delete_from_account.s(account.id).apply_async()
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@app.task
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@unique
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def refresh_account_with_oldest_post():
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post = (Post.query.outerjoin(Post.author).join(Account.tokens)
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.filter(Account.backoff_until < db.func.now())
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.filter(~Account.dormant).group_by(Post).order_by(
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db.asc(Post.updated_at)).first())
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refresh_account(post.author_id)
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@app.task
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@unique
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def refresh_account_with_longest_time_since_refresh():
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acc = (Account.query.join(Account.tokens).group_by(Account)
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.filter(Account.backoff_until < db.func.now())
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.filter(~Account.dormant).order_by(db.asc(
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Account.last_refresh)).first())
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refresh_account(acc.id)
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@app.task
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def update_mastodon_instances_popularity():
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# bump score for each active account
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for acct in (Account.query.options(db.joinedload(Account.sessions))
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.filter(~Account.dormant).filter(
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Account.id.like('mastodon:%'))):
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instance = MastodonInstance.query.get(acct.mastodon_instance)
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if not instance:
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instance = MastodonInstance(
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instance=acct.mastodon_instance, popularity=10)
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db.session.add(instance)
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amount = 0.01
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if acct.policy_enabled:
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amount = 0.5
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for _ in acct.sessions:
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amount += 0.1
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instance.bump(amount / max(1, instance.popularity))
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# normalise scores so the top is 20
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top_pop = (db.session.query(db.func.max(MastodonInstance.popularity))
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.scalar())
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MastodonInstance.query.update({
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MastodonInstance.popularity:
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MastodonInstance.popularity * 20 / top_pop
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})
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db.session.commit()
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app.add_periodic_task(120, periodic_cleanup)
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app.add_periodic_task(40, queue_fetch_for_most_stale_accounts)
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app.add_periodic_task(9, queue_deletes)
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app.add_periodic_task(60, refresh_account_with_oldest_post)
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app.add_periodic_task(180, refresh_account_with_longest_time_since_refresh)
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app.add_periodic_task(61, update_mastodon_instances_popularity)
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if __name__ == '__main__':
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app.worker_main()
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