from celery import Celery, Task from app import app as flaskapp from app import db from model import Session, Account, TwitterArchive, Post, OAuthToken import lib.twitter from twitter import TwitterError from urllib.error import URLError from datetime import timedelta, datetime from zipfile import ZipFile from io import BytesIO, TextIOWrapper import json from kombu import Queue import random import version 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' 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 @app.task(autoretry_for=(TwitterError, URLError)) def fetch_acc(id, cursor=None): acc = Account.query.get(id) print(f'fetching {acc}') try: if(acc.service == 'twitter'): cursor = lib.twitter.fetch_acc(acc, cursor, **flaskapp.config.get_namespace("TWITTER_")) if cursor: fetch_acc.si(id, cursor).apply_async() finally: db.session.rollback() acc.touch_fetch() db.session.commit() @app.task def queue_fetch_for_most_stale_accounts(min_staleness=timedelta(minutes=5), limit=20): accs = Account.query\ .join(Account.tokens).group_by(Account)\ .filter(Account.last_fetch < db.func.now() - min_staleness)\ .order_by(db.asc(Account.last_fetch))\ .limit(limit) for acc in accs: fetch_acc.s(acc.id).delay() acc.touch_fetch() db.session.commit() @app.task(autoretry_for=(TwitterError, URLError)) 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 = lib.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 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)\ .delete(synchronize_session=False) # disable 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) for account in unreachable: account.policy_enabled = False db.session.commit() @app.task def queue_deletes(): eligible_accounts = Account.query.filter(Account.policy_enabled == True).\ filter(Account.next_delete < db.func.now()) for account in eligible_accounts: delete_from_account.s(account.id).apply_async() @app.task(autoretry_for=(TwitterError, URLError)) def delete_from_account(account_id): account = Account.query.get(account_id) latest_n_posts = Post.query.with_parent(account).order_by(db.desc(Post.created_at)).limit(account.policy_keep_latest) posts = Post.query.with_parent(account).\ filter(Post.created_at + account.policy_keep_younger <= db.func.now()).\ except_(latest_n_posts).\ order_by(db.func.random()).limit(100).all() posts = refresh_posts(posts) if account.service == 'twitter': eligible = list((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: if account.policy_delete_every == timedelta(0): print("deleting all {} eligible posts for {}".format(len(eligible), account)) for post in eligible: account.touch_delete() lib.twitter.delete(post) else: post = random.choice(eligible) print("deleting {}".format(post)) account.touch_delete() lib.twitter.delete(post) db.session.commit() def refresh_posts(posts): posts = list(posts) if len(posts) == 0: return [] if posts[0].service == 'twitter': return lib.twitter.refresh_posts(posts) @app.task(autoretry_for=(TwitterError, URLError)) def refresh_account(account_id): account = Account.query.get(account_id) posts = Post.query.with_parent(account).order_by(db.asc(Post.updated_at)).limit(100).all() posts = refresh_posts(posts) account.touch_refresh() db.session.commit() @app.task(autoretry_for=(TwitterError, URLError)) def refresh_account_with_oldest_post(): post = Post.query.outerjoin(Post.author).join(Account.tokens).group_by(Post).order_by(db.asc(Post.updated_at)).first() refresh_account(post.author_id) @app.task(autoretry_for=(TwitterError, URLError)) def refresh_account_with_longest_time_since_refresh(): acc = Account.query.join(Account.tokens).group_by(Account).order_by(db.asc(Account.last_refresh)).first() refresh_account(acc.id) app.add_periodic_task(6*60, periodic_cleanup) app.add_periodic_task(45, queue_fetch_for_most_stale_accounts) app.add_periodic_task(45, queue_deletes) app.add_periodic_task(90, refresh_account_with_oldest_post) app.add_periodic_task(90, refresh_account_with_longest_time_since_refresh) if __name__ == '__main__': app.worker_main()