Ignore Celery task results

Since we don't use the results of our Celery tasks (all of them return
None implicitly), it's prudent to set the ignore_result flag, for a
potential performance improvement. See the Celery docs for details [1].

We could do this with the global CELERY_IGNORE_RESULT setting, but it
offers more flexibility if we want to use task results in the future to
set it on a per-task basis.

[1]: https://docs.celeryq.dev/en/stable/userguide/tasks.html#ignore-results-you-don-t-want

bookwyrm/activitypub/base_activity.py

@@ -241,7 +241,7 @@ class ActivityObject:
         return data
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 @transaction.atomic
 def set_related_field(
     model_name, origin_model_name, related_field_name, related_remote_id, data

bookwyrm/activitystreams.py

@@ -466,7 +466,7 @@ def remove_statuses_on_unshelve(sender, instance, *args, **kwargs):
 # ---- TASKS
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def add_book_statuses_task(user_id, book_id):
     """add statuses related to a book on shelve"""
     user = models.User.objects.get(id=user_id)
@@ -474,7 +474,7 @@ def add_book_statuses_task(user_id, book_id):
     BooksStream().add_book_statuses(user, book)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def remove_book_statuses_task(user_id, book_id):
     """remove statuses about a book from a user's books feed"""
     user = models.User.objects.get(id=user_id)
@@ -482,7 +482,7 @@ def remove_book_statuses_task(user_id, book_id):
     BooksStream().remove_book_statuses(user, book)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def populate_stream_task(stream, user_id):
     """background task for populating an empty activitystream"""
     user = models.User.objects.get(id=user_id)
@@ -490,7 +490,7 @@ def populate_stream_task(stream, user_id):
     stream.populate_streams(user)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def remove_status_task(status_ids):
     """remove a status from any stream it might be in"""
     # this can take an id or a list of ids
@@ -503,7 +503,7 @@ def remove_status_task(status_ids):
             stream.remove_object_from_related_stores(status)
 
 
-@app.task(queue=HIGH)
+@app.task(queue=HIGH, ignore_result=True)
 def add_status_task(status_id, increment_unread=False):
     """add a status to any stream it should be in"""
     status = models.Status.objects.select_subclasses().get(id=status_id)
@@ -515,7 +515,7 @@ def add_status_task(status_id, increment_unread=False):
         stream.add_status(status, increment_unread=increment_unread)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def remove_user_statuses_task(viewer_id, user_id, stream_list=None):
     """remove all statuses by a user from a viewer's stream"""
     stream_list = [streams[s] for s in stream_list] if stream_list else streams.values()
@@ -525,7 +525,7 @@ def remove_user_statuses_task(viewer_id, user_id, stream_list=None):
         stream.remove_user_statuses(viewer, user)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def add_user_statuses_task(viewer_id, user_id, stream_list=None):
     """add all statuses by a user to a viewer's stream"""
     stream_list = [streams[s] for s in stream_list] if stream_list else streams.values()
@@ -535,7 +535,7 @@ def add_user_statuses_task(viewer_id, user_id, stream_list=None):
         stream.add_user_statuses(viewer, user)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def handle_boost_task(boost_id):
     """remove the original post and other, earlier boosts"""
     instance = models.Status.objects.get(id=boost_id)

bookwyrm/connectors/connector_manager.py

@@ -143,7 +143,7 @@ def get_or_create_connector(remote_id):
     return load_connector(connector_info)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def load_more_data(connector_id, book_id):
     """background the work of getting all 10,000 editions of LoTR"""
     connector_info = models.Connector.objects.get(id=connector_id)
@@ -152,7 +152,7 @@ def load_more_data(connector_id, book_id):
     connector.expand_book_data(book)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def create_edition_task(connector_id, work_id, data):
     """separate task for each of the 10,000 editions of LoTR"""
     connector_info = models.Connector.objects.get(id=connector_id)

bookwyrm/emailing.py

@@ -75,7 +75,7 @@ def format_email(email_name, data):
     return (subject, html_content, text_content)
 
 
-@app.task(queue=HIGH)
+@app.task(queue=HIGH, ignore_result=True)
 def send_email(recipient, subject, html_content, text_content):
     """use a task to send the email"""
     email = EmailMultiAlternatives(

bookwyrm/lists_stream.py

@@ -217,14 +217,14 @@ def add_list_on_account_create_command(user_id):
 
 
 # ---- TASKS
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def populate_lists_task(user_id):
     """background task for populating an empty list stream"""
     user = models.User.objects.get(id=user_id)
     ListsStream().populate_lists(user)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def remove_list_task(list_id, re_add=False):
     """remove a list from any stream it might be in"""
     stores = models.User.objects.filter(local=True, is_active=True).values_list(
@@ -239,14 +239,14 @@ def remove_list_task(list_id, re_add=False):
         add_list_task.delay(list_id)
 
 
-@app.task(queue=HIGH)
+@app.task(queue=HIGH, ignore_result=True)
 def add_list_task(list_id):
     """add a list to any stream it should be in"""
     book_list = models.List.objects.get(id=list_id)
     ListsStream().add_list(book_list)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def remove_user_lists_task(viewer_id, user_id, exclude_privacy=None):
     """remove all lists by a user from a viewer's stream"""
     viewer = models.User.objects.get(id=viewer_id)
@@ -254,7 +254,7 @@ def remove_user_lists_task(viewer_id, user_id, exclude_privacy=None):
     ListsStream().remove_user_lists(viewer, user, exclude_privacy=exclude_privacy)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def add_user_lists_task(viewer_id, user_id):
     """add all lists by a user to a viewer's stream"""
     viewer = models.User.objects.get(id=viewer_id)

bookwyrm/models/activitypub_mixin.py

@@ -506,7 +506,7 @@ def unfurl_related_field(related_field, sort_field=None):
     return related_field.remote_id
 
 
-@app.task(queue=BROADCAST)
+@app.task(queue=BROADCAST, ignore_result=True)
 def broadcast_task(sender_id: int, activity: str, recipients: List[str]):
     """the celery task for broadcast"""
     user_model = apps.get_model("bookwyrm.User", require_ready=True)

bookwyrm/models/antispam.py

@@ -65,7 +65,7 @@ class AutoMod(AdminModel):
     created_by = models.ForeignKey("User", on_delete=models.PROTECT)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def automod_task():
     """Create reports"""
     if not AutoMod.objects.exists():

bookwyrm/models/import_job.py

@@ -327,7 +327,7 @@ class ImportItem(models.Model):
         )
 
 
-@app.task(queue=IMPORTS)
+@app.task(queue=IMPORTS, ignore_result=True)
 def start_import_task(job_id):
     """trigger the child tasks for each row"""
     job = ImportJob.objects.get(id=job_id)
@@ -346,7 +346,7 @@ def start_import_task(job_id):
     job.save()
 
 
-@app.task(queue=IMPORTS)
+@app.task(queue=IMPORTS, ignore_result=True)
 def import_item_task(item_id):
     """resolve a row into a book"""
     item = ImportItem.objects.get(id=item_id)

bookwyrm/models/user.py

@@ -469,7 +469,7 @@ class KeyPair(ActivitypubMixin, BookWyrmModel):
         return super().save(*args, **kwargs)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def set_remote_server(user_id):
     """figure out the user's remote server in the background"""
     user = User.objects.get(id=user_id)
@@ -513,7 +513,7 @@ def get_or_create_remote_server(domain, refresh=False):
     return server
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def get_remote_reviews(outbox):
     """ingest reviews by a new remote bookwyrm user"""
     outbox_page = outbox + "?page=true&type=Review"

bookwyrm/preview_images.py

@@ -420,7 +420,7 @@ def save_and_cleanup(image, instance=None):
 
 
 # pylint: disable=invalid-name
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def generate_site_preview_image_task():
     """generate preview_image for the website"""
     if not settings.ENABLE_PREVIEW_IMAGES:
@@ -445,7 +445,7 @@ def generate_site_preview_image_task():
 
 
 # pylint: disable=invalid-name
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def generate_edition_preview_image_task(book_id):
     """generate preview_image for a book"""
     if not settings.ENABLE_PREVIEW_IMAGES:
@@ -470,7 +470,7 @@ def generate_edition_preview_image_task(book_id):
     save_and_cleanup(image, instance=book)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def generate_user_preview_image_task(user_id):
     """generate preview_image for a user"""
     if not settings.ENABLE_PREVIEW_IMAGES:
@@ -496,7 +496,7 @@ def generate_user_preview_image_task(user_id):
     save_and_cleanup(image, instance=user)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def remove_user_preview_image_task(user_id):
     """remove preview_image for a user"""
     if not settings.ENABLE_PREVIEW_IMAGES:

bookwyrm/suggested_users.py

@@ -237,41 +237,41 @@ def domain_level_update(sender, instance, created, update_fields=None, **kwargs)
 # ------------------- TASKS
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def rerank_suggestions_task(user_id):
     """do the hard work in celery"""
     suggested_users.rerank_user_suggestions(user_id)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def rerank_user_task(user_id, update_only=False):
     """do the hard work in celery"""
     user = models.User.objects.get(id=user_id)
     suggested_users.rerank_obj(user, update_only=update_only)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def remove_user_task(user_id):
     """do the hard work in celery"""
     user = models.User.objects.get(id=user_id)
     suggested_users.remove_object_from_related_stores(user)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def remove_suggestion_task(user_id, suggested_user_id):
     """remove a specific user from a specific user's suggestions"""
     suggested_user = models.User.objects.get(id=suggested_user_id)
     suggested_users.remove_suggestion(user_id, suggested_user)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def bulk_remove_instance_task(instance_id):
     """remove a bunch of users from recs"""
     for user in models.User.objects.filter(federated_server__id=instance_id):
         suggested_users.remove_object_from_related_stores(user)
 
 
-@app.task(queue=LOW)
+@app.task(queue=LOW, ignore_result=True)
 def bulk_add_instance_task(instance_id):
     """remove a bunch of users from recs"""
     for user in models.User.objects.filter(federated_server__id=instance_id):

bookwyrm/views/inbox.py

@@ -115,7 +115,7 @@ def sometimes_async_activity_task(activity_json, queue=MEDIUM):
         activity_task.apply_async(args=(activity_json,), queue=queue)
 
 
-@app.task(queue=MEDIUM)
+@app.task(queue=MEDIUM, ignore_result=True)
 def activity_task(activity_json):
     """do something with this json we think is legit"""
     # lets see if the activitypub module can make sense of this json