forked from mirrors/bookwyrm
90 lines
2.9 KiB
Python
90 lines
2.9 KiB
Python
""" access the activity stores stored in redis """
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from abc import ABC, abstractmethod
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import redis
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from bookwyrm import settings
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r = redis.Redis(
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host=settings.REDIS_ACTIVITY_HOST, port=settings.REDIS_ACTIVITY_PORT, db=0
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)
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class RedisStore(ABC):
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"""sets of ranked, related objects, like statuses for a user's feed"""
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max_length = settings.MAX_STREAM_LENGTH
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def get_value(self, obj):
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"""the object and rank"""
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return {obj.id: self.get_rank(obj)}
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def add_object_to_related_stores(self, obj, execute=True):
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"""add an object to all suitable stores"""
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value = self.get_value(obj)
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# we want to do this as a bulk operation, hence "pipeline"
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pipeline = r.pipeline()
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for store in self.get_stores_for_object(obj):
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# add the status to the feed
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pipeline.zadd(store, value)
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# trim the store
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pipeline.zremrangebyrank(store, 0, -1 * self.max_length)
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if not execute:
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return pipeline
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# and go!
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return pipeline.execute()
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def remove_object_from_related_stores(self, obj):
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"""remove an object from all stores"""
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pipeline = r.pipeline()
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for store in self.get_stores_for_object(obj):
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pipeline.zrem(store, -1, obj.id)
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pipeline.execute()
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def bulk_add_objects_to_store(self, objs, store):
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"""add a list of objects to a given store"""
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pipeline = r.pipeline()
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for obj in objs[: self.max_length]:
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pipeline.zadd(store, self.get_value(obj))
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if objs:
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pipeline.zremrangebyrank(store, 0, -1 * self.max_length)
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pipeline.execute()
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def bulk_remove_objects_from_store(self, objs, store):
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"""remove a list of objects from a given store"""
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pipeline = r.pipeline()
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for obj in objs[: self.max_length]:
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pipeline.zrem(store, -1, obj.id)
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pipeline.execute()
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def get_store(self, store, **kwargs): # pylint: disable=no-self-use
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"""load the values in a store"""
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return r.zrevrange(store, 0, -1, **kwargs)
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def populate_store(self, store):
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"""go from zero to a store"""
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pipeline = r.pipeline()
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queryset = self.get_objects_for_store(store)
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# first, remove everything currently in it
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pipeline.delete(store)
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# now, add everything back
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for obj in queryset[: self.max_length]:
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pipeline.zadd(store, self.get_value(obj))
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# only trim the store if objects were added
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if queryset.exists():
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pipeline.zremrangebyrank(store, 0, -1 * self.max_length)
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pipeline.execute()
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@abstractmethod
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def get_objects_for_store(self, store):
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"""a queryset of what should go in a store, used for populating it"""
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@abstractmethod
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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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@abstractmethod
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def get_rank(self, obj):
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"""how to rank an object"""
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