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01c88a09cd
Instead of proxying through the magic getter of the RootConfig object. This should be more performant (and is more explicit).
115 lines
4.4 KiB
Python
115 lines
4.4 KiB
Python
# Copyright 2014 - 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from typing import TYPE_CHECKING, Optional
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from synapse.api.ratelimiting import Ratelimiter
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class BaseHandler:
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"""
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Common base class for the event handlers.
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Deprecated: new code should not use this. Instead, Handler classes should define the
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fields they actually need. The utility methods should either be factored out to
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standalone helper functions, or to different Handler classes.
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"""
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.auth = hs.get_auth()
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self.notifier = hs.get_notifier()
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self.state_handler = hs.get_state_handler()
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self.distributor = hs.get_distributor()
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self.clock = hs.get_clock()
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self.hs = hs
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# The rate_hz and burst_count are overridden on a per-user basis
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self.request_ratelimiter = Ratelimiter(
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store=self.store, clock=self.clock, rate_hz=0, burst_count=0
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)
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self._rc_message = self.hs.config.ratelimiting.rc_message
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# Check whether ratelimiting room admin message redaction is enabled
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# by the presence of rate limits in the config
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if self.hs.config.ratelimiting.rc_admin_redaction:
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self.admin_redaction_ratelimiter: Optional[Ratelimiter] = Ratelimiter(
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store=self.store,
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clock=self.clock,
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rate_hz=self.hs.config.ratelimiting.rc_admin_redaction.per_second,
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burst_count=self.hs.config.ratelimiting.rc_admin_redaction.burst_count,
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)
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else:
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self.admin_redaction_ratelimiter = None
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self.server_name = hs.hostname
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self.event_builder_factory = hs.get_event_builder_factory()
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async def ratelimit(self, requester, update=True, is_admin_redaction=False):
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"""Ratelimits requests.
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Args:
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requester (Requester)
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update (bool): Whether to record that a request is being processed.
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Set to False when doing multiple checks for one request (e.g.
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to check up front if we would reject the request), and set to
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True for the last call for a given request.
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is_admin_redaction (bool): Whether this is a room admin/moderator
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redacting an event. If so then we may apply different
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ratelimits depending on config.
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Raises:
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LimitExceededError if the request should be ratelimited
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"""
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user_id = requester.user.to_string()
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# The AS user itself is never rate limited.
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app_service = self.store.get_app_service_by_user_id(user_id)
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if app_service is not None:
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return # do not ratelimit app service senders
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messages_per_second = self._rc_message.per_second
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burst_count = self._rc_message.burst_count
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# Check if there is a per user override in the DB.
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override = await self.store.get_ratelimit_for_user(user_id)
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if override:
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# If overridden with a null Hz then ratelimiting has been entirely
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# disabled for the user
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if not override.messages_per_second:
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return
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messages_per_second = override.messages_per_second
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burst_count = override.burst_count
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if is_admin_redaction and self.admin_redaction_ratelimiter:
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# If we have separate config for admin redactions, use a separate
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# ratelimiter as to not have user_ids clash
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await self.admin_redaction_ratelimiter.ratelimit(requester, update=update)
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else:
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# Override rate and burst count per-user
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await self.request_ratelimiter.ratelimit(
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requester,
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rate_hz=messages_per_second,
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burst_count=burst_count,
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update=update,
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)
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