forked from mirrors/bookwyrm
279 lines
9.8 KiB
Python
279 lines
9.8 KiB
Python
""" store recommended follows in redis """
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import math
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import logging
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from django.dispatch import receiver
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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, r
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from bookwyrm.tasks import app
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logger = logging.getLogger(__name__)
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class SuggestedUsers(RedisStore):
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"""suggested users for a user"""
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max_length = 30
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def get_rank(self, obj):
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"""get computed rank"""
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return obj.mutuals # + (1.0 - (1.0 / (obj.shared_books + 1)))
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def store_id(self, user): # pylint: disable=no-self-use
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"""the key used to store this user's recs"""
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if isinstance(user, int):
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return f"{user}-suggestions"
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return f"{user.id}-suggestions"
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def get_counts_from_rank(self, rank): # pylint: disable=no-self-use
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"""calculate mutuals count and shared books count from rank"""
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# pylint: disable=c-extension-no-member
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return {
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"mutuals": math.floor(rank),
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# "shared_books": int(1 / (-1 * (rank % 1 - 1))) - 1,
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}
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def get_objects_for_store(self, store):
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"""a list of potential follows for a user"""
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user = models.User.objects.get(id=store.split("-")[0])
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return get_annotated_users(
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user,
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~Q(id=user.id),
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~Q(followers=user),
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~Q(follower_requests=user),
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bookwyrm_user=True,
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)
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def get_stores_for_object(self, obj):
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return [self.store_id(u) for u in self.get_users_for_object(obj)]
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def get_users_for_object(self, obj): # pylint: disable=no-self-use
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"""given a user, who might want to follow them"""
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return models.User.objects.filter(local=True,).exclude(
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Q(id=obj.id) | Q(followers=obj) | Q(id__in=obj.blocks.all()) | Q(blocks=obj)
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)
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def rerank_obj(self, obj, update_only=True):
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"""update all the instances of this user with new ranks"""
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pipeline = r.pipeline()
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for store_user in self.get_users_for_object(obj):
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annotated_user = get_annotated_users(
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store_user,
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id=obj.id,
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).first()
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if not annotated_user:
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continue
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pipeline.zadd(
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self.store_id(store_user),
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self.get_value(annotated_user),
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xx=update_only,
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)
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pipeline.execute()
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def rerank_user_suggestions(self, user):
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"""update the ranks of the follows suggested to a user"""
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self.populate_store(self.store_id(user))
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def remove_suggestion(self, user, suggested_user):
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"""take a user out of someone's suggestions"""
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self.bulk_remove_objects_from_store([suggested_user], self.store_id(user))
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def get_suggestions(self, user, local=False):
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"""get suggestions"""
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values = self.get_store(self.store_id(user), withscores=True)
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results = []
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# annotate users with mutuals and shared book counts
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for user_id, rank in values:
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counts = self.get_counts_from_rank(rank)
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try:
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user = models.User.objects.get(
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id=user_id, is_active=True, bookwyrm_user=True
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)
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except models.User.DoesNotExist as err:
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# if this happens, the suggestions are janked way up
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logger.exception(err)
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continue
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user.mutuals = counts["mutuals"]
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if (local and user.local) or not local:
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results.append(user)
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if len(results) >= 5:
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break
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return results
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def get_annotated_users(viewer, *args, **kwargs):
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"""Users, annotated with things they have in common"""
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return (
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models.User.objects.filter(discoverable=True, is_active=True, *args, **kwargs)
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.exclude(Q(id__in=viewer.blocks.all()) | Q(blocks=viewer))
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.annotate(
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mutuals=Count(
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"followers",
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filter=Q(
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~Q(id=viewer.id),
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~Q(id__in=viewer.following.all()),
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followers__in=viewer.following.all(),
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),
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distinct=True,
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),
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# pylint: disable=line-too-long
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# shared_books=Count(
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# "shelfbook",
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# filter=Q(
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# ~Q(id=viewer.id),
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# shelfbook__book__parent_work__in=[
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# s.book.parent_work for s in viewer.shelfbook_set.all()
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# ],
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# ),
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# distinct=True,
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# ),
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)
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)
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suggested_users = SuggestedUsers()
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@receiver(signals.post_save, sender=models.UserFollows)
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# pylint: disable=unused-argument
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def update_suggestions_on_follow(sender, instance, created, *args, **kwargs):
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"""remove a follow from the recs and update the ranks"""
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if not created or not instance.user_object.discoverable:
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return
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if instance.user_subject.local:
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remove_suggestion_task.delay(instance.user_subject.id, instance.user_object.id)
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rerank_user_task.delay(instance.user_object.id, update_only=False)
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@receiver(signals.post_save, sender=models.UserFollowRequest)
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# pylint: disable=unused-argument
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def update_suggestions_on_follow_request(sender, instance, created, *args, **kwargs):
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"""remove a follow from the recs and update the ranks"""
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if not created or not instance.user_object.discoverable:
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return
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if instance.user_subject.local:
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remove_suggestion_task.delay(instance.user_subject.id, instance.user_object.id)
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@receiver(signals.post_save, sender=models.UserBlocks)
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# pylint: disable=unused-argument
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def update_suggestions_on_block(sender, instance, *args, **kwargs):
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"""remove blocked users from recs"""
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if instance.user_subject.local and instance.user_object.discoverable:
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remove_suggestion_task.delay(instance.user_subject.id, instance.user_object.id)
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if instance.user_object.local and instance.user_subject.discoverable:
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remove_suggestion_task.delay(instance.user_object.id, instance.user_subject.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 update_suggestions_on_unfollow(sender, instance, **kwargs):
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"""update rankings, but don't re-suggest because it was probably intentional"""
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if instance.user_object.discoverable:
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rerank_user_task.delay(instance.user_object.id, update_only=False)
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# @receiver(signals.post_save, sender=models.ShelfBook)
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# @receiver(signals.post_delete, sender=models.ShelfBook)
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# # pylint: disable=unused-argument
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# def update_rank_on_shelving(sender, instance, *args, **kwargs):
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# """when a user shelves or unshelves a book, re-compute their rank"""
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# # if it's a local user, re-calculate who is rec'ed to them
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# if instance.user.local:
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# rerank_suggestions_task.delay(instance.user.id)
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#
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# # if the user is discoverable, update their rankings
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# if instance.user.discoverable:
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# rerank_user_task.delay(instance.user.id)
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@receiver(signals.post_save, sender=models.User)
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# pylint: disable=unused-argument, too-many-arguments
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def update_user(sender, instance, created, update_fields=None, **kwargs):
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"""an updated user, neat"""
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# a new user is found, create suggestions for them
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if created and instance.local:
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rerank_suggestions_task.delay(instance.id)
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# we know what fields were updated and discoverability didn't change
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if not instance.bookwyrm_user or (
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update_fields and not "discoverable" in update_fields
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):
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return
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# deleted the user
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if not created and not instance.is_active:
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remove_user_task.delay(instance.id)
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return
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# this happens on every save, not just when discoverability changes, annoyingly
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if instance.discoverable:
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rerank_user_task.delay(instance.id, update_only=False)
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elif not created:
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remove_user_task.delay(instance.id)
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@receiver(signals.post_save, sender=models.FederatedServer)
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def domain_level_update(sender, instance, created, update_fields=None, **kwargs):
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"""remove users on a domain block"""
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if (
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not update_fields
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or "status" not in update_fields
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or instance.application_type != "bookwyrm"
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):
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return
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if instance.status == "blocked":
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bulk_remove_instance_task.delay(instance.id)
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return
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bulk_add_instance_task.delay(instance.id)
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# ------------------- TASKS
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@app.task(queue="low_priority")
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def rerank_suggestions_task(user_id):
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"""do the hard work in celery"""
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suggested_users.rerank_user_suggestions(user_id)
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@app.task(queue="low_priority")
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def rerank_user_task(user_id, update_only=False):
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"""do the hard work in celery"""
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user = models.User.objects.get(id=user_id)
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suggested_users.rerank_obj(user, update_only=update_only)
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@app.task(queue="low_priority")
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def remove_user_task(user_id):
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"""do the hard work in celery"""
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user = models.User.objects.get(id=user_id)
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suggested_users.remove_object_from_related_stores(user)
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@app.task(queue="medium_priority")
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def remove_suggestion_task(user_id, suggested_user_id):
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"""remove a specific user from a specific user's suggestions"""
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suggested_user = models.User.objects.get(id=suggested_user_id)
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suggested_users.remove_suggestion(user_id, suggested_user)
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@app.task(queue="low_priority")
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def bulk_remove_instance_task(instance_id):
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"""remove a bunch of users from recs"""
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for user in models.User.objects.filter(federated_server__id=instance_id):
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suggested_users.remove_object_from_related_stores(user)
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@app.task(queue="low_priority")
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def bulk_add_instance_task(instance_id):
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"""remove a bunch of users from recs"""
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for user in models.User.objects.filter(federated_server__id=instance_id):
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suggested_users.rerank_obj(user, update_only=False)
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