mirror of
https://github.com/bookwyrm-social/bookwyrm.git
synced 2024-05-03 00:59:08 +00:00
263 lines
9.6 KiB
Python
263 lines
9.6 KiB
Python
""" access the list streams stored in redis """
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from django.dispatch import receiver
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from django.db import transaction
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from django.db.models import signals, Count, Q
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from bookwyrm import models
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from bookwyrm.redis_store import RedisStore
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from bookwyrm.tasks import app, LISTS
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class ListsStream(RedisStore):
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"""all the lists you can see"""
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def stream_id(self, user): # pylint: disable=no-self-use
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"""the redis key for this user's instance of this stream"""
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if isinstance(user, int):
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# allows the function to take an int or an obj
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return f"{user}-lists"
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return f"{user.id}-lists"
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def get_rank(self, obj): # pylint: disable=no-self-use
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"""lists are sorted by updated date"""
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return obj.updated_date.timestamp()
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def add_list(self, book_list):
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"""add a list to users' feeds"""
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self.add_object_to_stores(book_list, self.get_stores_for_object(book_list))
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def add_user_lists(self, viewer, user):
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"""add a user's lists to another user's feed"""
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# only add the lists that the viewer should be able to see
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lists = models.List.privacy_filter(viewer).filter(user=user)
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self.bulk_add_objects_to_store(lists, self.stream_id(viewer))
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def remove_user_lists(self, viewer, user, exclude_privacy=None):
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"""remove a user's list from another user's feed"""
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# remove all so that followers only lists are removed
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lists = user.list_set
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if exclude_privacy:
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lists = lists.exclude(privacy=exclude_privacy)
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self.bulk_remove_objects_from_store(lists.all(), self.stream_id(viewer))
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def get_list_stream(self, user):
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"""load the lists to be displayed"""
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lists = self.get_store(self.stream_id(user))
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return (
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models.List.objects.filter(id__in=lists)
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.annotate(item_count=Count("listitem", filter=Q(listitem__approved=True)))
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# hide lists with no approved books
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.filter(item_count__gt=0)
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.select_related("user")
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.prefetch_related("listitem_set")
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.order_by("-updated_date")
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.distinct()
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)
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def populate_lists(self, user):
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"""go from zero to a timeline"""
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self.populate_store(self.stream_id(user))
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def get_audience(self, book_list): # pylint: disable=no-self-use
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"""given a list, what users should see it"""
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# everybody who could plausibly see this list
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audience = models.User.objects.filter(
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is_active=True,
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local=True, # we only create feeds for users of this instance
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).exclude( # not blocked
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Q(id__in=book_list.user.blocks.all()) | Q(blocks=book_list.user)
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)
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group = book_list.group
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# only visible to the poster and mentioned users
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if book_list.privacy == "direct":
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if group:
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audience = audience.filter(
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Q(id=book_list.user.id) # if the user is the post's author
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| ~Q(groups=group.memberships) # if the user is in the group
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)
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else:
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audience = audience.filter(
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Q(id=book_list.user.id) # if the user is the post's author
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)
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# only visible to the poster's followers and tagged users
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elif book_list.privacy == "followers":
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if group:
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audience = audience.filter(
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Q(id=book_list.user.id) # if the user is the list's owner
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| Q(following=book_list.user) # if the user is following the owner
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# if a user is in the group
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| Q(memberships__group__id=book_list.group.id)
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)
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else:
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audience = audience.filter(
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Q(id=book_list.user.id) # if the user is the list's owner
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| Q(following=book_list.user) # if the user is following the owner
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)
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return audience.distinct()
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def get_stores_for_object(self, obj):
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"""the stores that an object belongs in"""
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return [self.stream_id(u) for u in self.get_audience(obj)]
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def get_lists_for_user(self, user): # pylint: disable=no-self-use
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"""given a user, what lists should they see on this stream"""
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return models.List.privacy_filter(
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user,
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privacy_levels=["public", "followers"],
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)
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def get_objects_for_store(self, store):
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user = models.User.objects.get(id=store.split("-")[0])
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return self.get_lists_for_user(user)
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@receiver(signals.post_save, sender=models.List)
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# pylint: disable=unused-argument
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def add_list_on_create(sender, instance, created, *args, update_fields=None, **kwargs):
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"""add newly created lists streams"""
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if created:
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# when creating new things, gotta wait on the transaction
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transaction.on_commit(lambda: add_list_on_create_command(instance.id))
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return
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# if update_fields was specified, we can check if privacy was updated, but if
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# it wasn't specified (ie, by an activitypub update), there's no way to know
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if update_fields and "privacy" not in update_fields:
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return
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# the privacy may have changed, so we need to re-do the whole thing
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remove_list_task.delay(instance.id, re_add=True)
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@receiver(signals.post_delete, sender=models.List)
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# pylint: disable=unused-argument
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def remove_list_on_delete(sender, instance, *args, **kwargs):
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"""remove deleted lists to streams"""
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remove_list_task.delay(instance.id)
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def add_list_on_create_command(instance_id):
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"""runs this code only after the database commit completes"""
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add_list_task.delay(instance_id)
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@receiver(signals.post_save, sender=models.UserFollows)
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# pylint: disable=unused-argument
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def add_lists_on_follow(sender, instance, created, *args, **kwargs):
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"""add a newly followed user's lists to feeds"""
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if not created or not instance.user_subject.local:
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return
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add_user_lists_task.delay(instance.user_subject.id, instance.user_object.id)
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@receiver(signals.post_delete, sender=models.UserFollows)
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# pylint: disable=unused-argument
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def remove_lists_on_unfollow(sender, instance, *args, **kwargs):
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"""remove lists from a feed on unfollow"""
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if not instance.user_subject.local:
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return
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# remove all but public lists
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remove_user_lists_task.delay(
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instance.user_subject.id, instance.user_object.id, exclude_privacy="public"
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)
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@receiver(signals.post_save, sender=models.UserBlocks)
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# pylint: disable=unused-argument
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def remove_lists_on_block(sender, instance, *args, **kwargs):
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"""remove lists from all feeds on block"""
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# blocks apply ot all feeds
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if instance.user_subject.local:
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remove_user_lists_task.delay(instance.user_subject.id, instance.user_object.id)
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# and in both directions
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if instance.user_object.local:
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remove_user_lists_task.delay(instance.user_object.id, instance.user_subject.id)
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@receiver(signals.post_delete, sender=models.UserBlocks)
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# pylint: disable=unused-argument
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def add_lists_on_unblock(sender, instance, *args, **kwargs):
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"""add lists back to all feeds on unblock"""
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# make sure there isn't a block in the other direction
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if models.UserBlocks.objects.filter(
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user_subject=instance.user_object,
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user_object=instance.user_subject,
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).exists():
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return
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# add lists back to streams with lists from anyone
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if instance.user_subject.local:
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add_user_lists_task.delay(
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instance.user_subject.id,
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instance.user_object.id,
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)
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# add lists back to streams with lists from anyone
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if instance.user_object.local:
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add_user_lists_task.delay(
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instance.user_object.id,
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instance.user_subject.id,
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)
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@receiver(signals.post_save, sender=models.User)
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# pylint: disable=unused-argument
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def populate_lists_on_account_create(sender, instance, created, *args, **kwargs):
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"""build a user's feeds when they join"""
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if not created or not instance.local:
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return
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transaction.on_commit(lambda: add_list_on_account_create_command(instance.id))
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def add_list_on_account_create_command(user_id):
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"""wait for the transaction to complete"""
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populate_lists_task.delay(user_id)
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# ---- TASKS
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@app.task(queue=LISTS)
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def populate_lists_task(user_id):
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"""background task for populating an empty list stream"""
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user = models.User.objects.get(id=user_id)
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ListsStream().populate_lists(user)
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@app.task(queue=LISTS)
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def remove_list_task(list_id, re_add=False):
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"""remove a list from any stream it might be in"""
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stores = models.User.objects.filter(local=True, is_active=True).values_list(
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"id", flat=True
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)
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# delete for every store
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stores = [ListsStream().stream_id(idx) for idx in stores]
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ListsStream().remove_object_from_stores(list_id, stores)
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if re_add:
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add_list_task.delay(list_id)
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@app.task(queue=LISTS)
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def add_list_task(list_id):
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"""add a list to any stream it should be in"""
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book_list = models.List.objects.get(id=list_id)
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ListsStream().add_list(book_list)
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@app.task(queue=LISTS)
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def remove_user_lists_task(viewer_id, user_id, exclude_privacy=None):
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"""remove all lists by a user from a viewer's stream"""
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viewer = models.User.objects.get(id=viewer_id)
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user = models.User.objects.get(id=user_id)
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ListsStream().remove_user_lists(viewer, user, exclude_privacy=exclude_privacy)
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@app.task(queue=LISTS)
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def add_user_lists_task(viewer_id, user_id):
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"""add all lists by a user to a viewer's stream"""
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viewer = models.User.objects.get(id=viewer_id)
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user = models.User.objects.get(id=user_id)
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ListsStream().add_user_lists(viewer, user)
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