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briquet
9bc712009a
Before this commit, a room update and a soft deletion racing each other could leave the room active. Both `perform_update`s now re-read the room with `SELECT ... FOR UPDATE` inside a transaction to avoid this race condition.
18 lines
485 B
Python
18 lines
485 B
Python
"""Row locks guarding the API write paths."""
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import contextlib
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from django.db import transaction
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from core import models
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from core.api.exceptions import ensure_room_not_deleted
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@contextlib.contextmanager
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def room_locked_for_update(room):
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"""Lock a room's row for the duration of a write."""
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with transaction.atomic():
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locked_room = models.Room.all_objects.select_for_update().get(pk=room.pk)
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ensure_room_not_deleted(locked_room)
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yield locked_room
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