Add scheduler to be able to schedule worker jobs to certain times

backend/app/config.py

@@ -80,5 +80,7 @@ class Settings(BaseSettings):
 
     backend_node_url: str | None = None
 
+    is_worker: bool = False
+
 
 settings = Settings()

backend/app/cron.py

@@ -0,0 +1,16 @@
+from apscheduler.triggers.cron import CronTrigger
+
+JOBS = []
+
+
+def cron(crontab):
+    """Wrap a Dramatiq actor in a cron schedule."""
+    trigger = CronTrigger.from_crontab(crontab)
+
+    def decorator(actor):
+        module_path = actor.fn.__module__
+        func_name = actor.fn.__name__
+        JOBS.append((trigger, module_path, func_name))
+        return actor
+
+    return decorator

backend/app/update.py

@@ -14,7 +14,6 @@ def register_to_app(app: FastAPI):
 async def update():
     worker.update.send()
     worker.update_quality_moderation.send()
-    worker.update_app_picks.send()
 
 
 @router.post("/stats", tags=["update"])

backend/app/worker.py

@@ -9,6 +9,8 @@
 import requests
 import sentry_dramatiq
 import sentry_sdk
+from apscheduler.schedulers.blocking import BlockingScheduler
+from backend.app import cron
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
 
@@ -325,6 +327,7 @@ def refresh_github_repo_list(gh_access_token: str, accountId: int):
         sqldb.session.commit()
 
 
+@cron.cron("0 3 * * *")  # every day at 3am
 @dramatiq.actor
 def update_app_picks():
     with WorkerDB() as sqldb:
@@ -387,3 +390,15 @@ def pick_app_of_the_day_automatically(sqldb, day):
 
     if len(oldest_apps) > 0:
         models.AppOfTheDay.set_app_of_the_day(sqldb, oldest_apps[0], day)
+
+
+if settings.is_worker:
+    scheduler = BlockingScheduler()
+    for trigger, module_path, func_name in cron.JOBS:
+        job_path = f"{module_path}:{func_name}.send"
+        job_name = f"{module_path}.{func_name}"
+        scheduler.add_job(job_path, trigger=trigger, name=job_name)
+    try:
+        scheduler.start()
+    except KeyboardInterrupt:
+        scheduler.shutdown()

backend/docker-compose.yml

@@ -79,6 +79,7 @@ services:
       - SMTP_PASSWORD=$SMTP_PASSWORD
       - EMAIL_FROM=$EMAIL_FROM
       - BACKEND_NODE_URL=${BACKEND_NODE_URL-http://backend-node:8001}
+      - IS_WORKER=true
     depends_on:
       - redis
       - db

backend/pyproject.toml

@@ -34,6 +34,7 @@ sqlalchemy = "2.0.31"
 sentry-dramatiq = "^0.3.3"
 pydantic-settings = "^2.3.4"
 psycopg2-binary = "^2.9.9"
+apscheduler = "^3.10.4"
 
 [tool.poetry.group.dev.dependencies]
 httpx = "^0.27.0"