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b4470ac8e1
This new function optimizes how we fetch subscriptions for streams. Basically, it excludes most long-term-idle users from the query. With 8k users, of which all but 400 are long term idle, this speeds up get_recipient_info from about 150ms to 50ms. Overall this change appears to save a factor of 2-3 in the backend processing time for sending or editing a message in large, public streams in chat.zulip.org (at 18K users today).
26 lines
721 B
Python
26 lines
721 B
Python
from typing import Set
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from zerver.models import MutedTopic
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class StreamTopicTarget:
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"""
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This class is designed to help us move to a
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StreamTopic table or something similar. It isolates
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places where we are are still using `topic_name` as
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a key into tables.
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"""
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def __init__(self, stream_id: int, topic_name: str) -> None:
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self.stream_id = stream_id
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self.topic_name = topic_name
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def user_ids_muting_topic(self) -> Set[int]:
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query = MutedTopic.objects.filter(
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stream_id=self.stream_id,
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topic_name__iexact=self.topic_name,
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).values(
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"user_profile_id",
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)
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return {row["user_profile_id"] for row in query}
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