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62 lines
2.6 KiB
Python
62 lines
2.6 KiB
Python
from django.conf import settings
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from django.db.models import Sum
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from django.db.models.query import F
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from django.db.models.functions import Length
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from zerver.models import BotUserStateData, UserProfile, Length
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from typing import Text, Optional
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class StateError(Exception):
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pass
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def get_bot_state(bot_profile, key):
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# type: (UserProfile, Text) -> Text
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try:
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return BotUserStateData.objects.get(bot_profile=bot_profile, key=key).value
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except BotUserStateData.DoesNotExist:
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raise StateError("Key does not exist.")
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def get_bot_state_size(bot_profile, key=None):
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# type: (UserProfile, Optional[Text]) -> int
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if key is None:
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return BotUserStateData.objects.filter(bot_profile=bot_profile) \
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.annotate(key_size=Length('key'), value_size=Length('value')) \
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.aggregate(sum=Sum(F('key_size')+F('value_size')))['sum'] or 0
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else:
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try:
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return len(key) + len(BotUserStateData.objects.get(bot_profile=bot_profile, key=key).value)
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except BotUserStateData.DoesNotExist:
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return 0
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def set_bot_state(bot_profile, key, value):
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# type: (UserProfile, Text, Text) -> None
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state_size_limit = settings.USER_STATE_SIZE_LIMIT
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old_entry_size = get_bot_state_size(bot_profile, key)
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new_entry_size = len(key) + len(value)
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old_state_size = get_bot_state_size(bot_profile)
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new_state_size = old_state_size + (new_entry_size - old_entry_size)
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if new_state_size > state_size_limit:
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raise StateError("Request exceeds storage limit by {} characters. The limit is {} characters."
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.format(new_state_size - state_size_limit, state_size_limit))
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elif type(key) is not str:
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raise StateError("Key type is {}, but should be str.".format(type(key)))
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elif type(value) is not str:
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raise StateError("Value type is {}, but should be str.".format(type(value)))
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else:
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obj, created = BotUserStateData.objects.get_or_create(bot_profile=bot_profile, key=key,
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defaults={'value': value})
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if not created:
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obj.value = value
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obj.save()
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def remove_bot_state(bot_profile, key):
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# type: (UserProfile, Text) -> None
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try:
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BotUserStateData.objects.get(bot_profile=bot_profile, key=key).delete()
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except BotUserStateData.DoesNotExist:
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raise StateError("Key does not exist.".format(key))
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def is_key_in_bot_state(bot_profile, key):
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# type: (UserProfile, Text) -> bool
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return BotUserStateData.objects.filter(bot_profile=bot_profile, key=key).exists()
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