use simpler RQ library instead of celery

celeryconfig.py

@@ -1,15 +0,0 @@
-import datetime
-
-BROKER_URL = 'redis://'
-CELERY_RESULT_BACKEND = 'redis'
-CELERY_TASK_SERIALIZER = 'json'
-CELERY_RESULT_SERIALIZER = 'json'
-CELERY_ACCEPT_CONTENT = ['json']
-CELERYBEAT_SCHEDULE = {
-    'tick-every-5-minutes': {
-        'task': 'woodwind.tasks.tick',
-        'schedule': datetime.timedelta(minutes=5),
-    }
-}
-# recommended to disable if not using -- introduces a lot of complexity
-CELERY_DISABLE_RATE_LIMITS = False

setup.py

@@ -10,6 +10,19 @@ setup(name='Woodwind',
       url='https://indiewebcamp.com/Woodwind',
       packages=['woodwind'],
       install_requires=[
-          'Flask', 'Flask-Login', 'Flask-Micropub', 'Flask-SQLAlchemy',
+          'Flask',
-          'beautifulsoup4', 'bleach', 'celery', 'feedparser', 'html5lib',
+          'Flask-Login',
-          'mf2py', 'mf2util', 'redis', 'requests', 'tornado'])
+          'Flask-Micropub',
+          'Flask-SQLAlchemy',
+          'beautifulsoup4',
+          'bleach',
+          'feedparser',
+          'html5lib',
+          'mf2py',
+          'mf2util',
+          'redis',
+          'requests',
+          'rq',
+          'tornado',
+          'uwsgi',
+      ])

woodwind-dev.ini

@@ -0,0 +1,8 @@
+[uwsgi]
+master=true
+processes=1
+threads=1
+http=:4000
+module=woodwind.wsgi
+attach-daemon=rqworker
+import=woodwind.tasks

woodwind.ini

@@ -1,8 +1,9 @@
 [uwsgi]
 master=true
-processes=4
+processes=2
-threads=2
+threads=4
 socket=/tmp/woodwind.sock
 chmod-socket=666
 module=woodwind.wsgi
-#pidfile=/tmp/woodwind.pid
+attach-daemon=rqworker
+import=woodwind.tasks

woodwind/push.py

@@ -51,5 +51,5 @@ def notify(feed_id):
     current_app.logger.debug('received PuSH ping for %r', feed)
     feed.last_pinged = datetime.datetime.utcnow()
     db.session.commit()
-    tasks.update_feed.delay(feed.id)
+    tasks.q.enqueue(tasks.update_feed, feed.id)
     return make_response('', 204)

woodwind/tasks.py

@@ -1,21 +1,22 @@
 from config import Config
 from contextlib import contextmanager
-from woodwind.models import Feed, Entry
 from redis import StrictRedis
+from uwsgidecorators import timer
+from woodwind.models import Feed, Entry
 import bs4
-import celery
-import celery.utils.log
 import datetime
 import feedparser
 import json
+import logging
 import mf2py
 import mf2util
 import re
+import requests
+import rq
 import sqlalchemy
 import sqlalchemy.orm
 import time
 import urllib.parse
-import requests
 
 
 UPDATE_INTERVAL = datetime.timedelta(hours=1)
@@ -23,15 +24,11 @@ TWITTER_RE = re.compile(
     r'https?://(?:www\.|mobile\.)?twitter\.com/(\w+)/status(?:es)?/(\w+)')
 TAG_RE = re.compile(r'</?\w+[^>]*?>')
 
-
+logger = logging.getLogger(__name__)
-app = celery.Celery('woodwind')
-app.config_from_object('celeryconfig')
-
-logger = celery.utils.log.get_task_logger(__name__)
 engine = sqlalchemy.create_engine(Config.SQLALCHEMY_DATABASE_URI)
 Session = sqlalchemy.orm.sessionmaker(bind=engine)
-
 redis = StrictRedis()
+q = rq.Queue(connection=redis)
 
 
 @contextmanager
@@ -48,20 +45,23 @@ def session_scope():
         session.close()
 
 
-@app.task
+@timer(300)
-def tick():
+def tick(signum=None):
+    """Checks all feeds to see if any of them are ready for an update.
+    Makes use of uWSGI timers to run every 5 minutes, without needing
+    a separate process to fire ticks.
+    """
     with session_scope() as session:
         now = datetime.datetime.utcnow()
-        logger.debug('Tick {}'.format(now))
+        logger.info('Tick {}'.format(now))
         for feed in session.query(Feed).all():
             logger.debug('Feed {} last checked {}'.format(
                 feed, feed.last_checked))
             if (not feed.last_checked
                     or now - feed.last_checked > UPDATE_INTERVAL):
-                update_feed.delay(feed.id)
+                q.enqueue(update_feed, feed.id)
 
 
-@app.task
 def update_feed(feed_id):
     with session_scope() as session:
         feed = session.query(Feed).get(feed_id)
@@ -359,7 +359,6 @@ def hentry_to_entry(hentry, feed, backfill):
     return entry
 
 
-@app.task
 def fetch_reply_context(entry_id, in_reply_to):
     with session_scope() as session:
         entry = session.query(Entry).get(entry_id)
@@ -396,7 +395,6 @@ def proxy_url(url):
     return url
 
 
-
 def fallback_photo(url):
     """Use favatar to find an appropriate photo for any URL"""
     domain = urllib.parse.urlparse(url).netloc

woodwind/views.py

@@ -95,7 +95,7 @@ def settings():
 @flask_login.login_required
 def update_feed():
     feed_id = flask.request.form.get('id')
-    tasks.update_feed.delay(feed_id)
+    tasks.q.enqueue(tasks.update_feed, feed_id)
     return flask.redirect(flask.url_for('.feeds'))
 
 
@@ -103,7 +103,7 @@ def update_feed():
 @flask_login.login_required
 def update_all():
     for feed in flask_login.current_user.feeds:
-        tasks.update_feed.delay(feed.id)
+        tasks.q.enqueue(tasks.update_feed, feed.id)
     return flask.redirect(flask.url_for('.feeds'))
 
 
@@ -293,7 +293,7 @@ def add_subscription(origin, feed_url, type):
         flask_login.current_user.feeds.append(feed)
         db.session.commit()
         # go ahead and update the fed
-        tasks.update_feed.delay(feed.id)
+        tasks.q.enqueue(update_feed, feed.id)
     return feed