664 lines
26 KiB
Python
664 lines
26 KiB
Python
# Copyright 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 contextlib
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import logging
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import time
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from typing import TYPE_CHECKING, Any, Generator, Optional, Tuple, Union
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import attr
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from zope.interface import implementer
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from twisted.internet.address import UNIXAddress
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from twisted.internet.defer import Deferred
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from twisted.internet.interfaces import IAddress, IReactorTime
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from twisted.python.failure import Failure
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from twisted.web.http import HTTPChannel
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from twisted.web.resource import IResource, Resource
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from twisted.web.server import Request, Site
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from synapse.config.server import ListenerConfig
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from synapse.http import get_request_user_agent, redact_uri
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from synapse.http.request_metrics import RequestMetrics, requests_counter
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from synapse.logging.context import (
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ContextRequest,
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LoggingContext,
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PreserveLoggingContext,
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)
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from synapse.types import Requester
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if TYPE_CHECKING:
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import opentracing
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logger = logging.getLogger(__name__)
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_next_request_seq = 0
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class SynapseRequest(Request):
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"""Class which encapsulates an HTTP request to synapse.
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All of the requests processed in synapse are of this type.
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It extends twisted's twisted.web.server.Request, and adds:
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* Unique request ID
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* A log context associated with the request
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* Redaction of access_token query-params in __repr__
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* Logging at start and end
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* Metrics to record CPU, wallclock and DB time by endpoint.
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* A limit to the size of request which will be accepted
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It also provides a method `processing`, which returns a context manager. If this
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method is called, the request won't be logged until the context manager is closed;
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this is useful for asynchronous request handlers which may go on processing the
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request even after the client has disconnected.
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Attributes:
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logcontext: the log context for this request
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"""
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def __init__(
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self,
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channel: HTTPChannel,
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site: "SynapseSite",
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*args: Any,
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max_request_body_size: int = 1024,
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request_id_header: Optional[str] = None,
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**kw: Any,
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):
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super().__init__(channel, *args, **kw)
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self._max_request_body_size = max_request_body_size
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self.request_id_header = request_id_header
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self.synapse_site = site
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self.reactor = site.reactor
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self._channel = channel # this is used by the tests
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self.start_time = 0.0
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self.experimental_cors_msc3886 = site.experimental_cors_msc3886
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# The requester, if authenticated. For federation requests this is the
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# server name, for client requests this is the Requester object.
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self._requester: Optional[Union[Requester, str]] = None
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# An opentracing span for this request. Will be closed when the request is
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# completely processed.
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self._opentracing_span: "Optional[opentracing.Span]" = None
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# we can't yet create the logcontext, as we don't know the method.
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self.logcontext: Optional[LoggingContext] = None
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# The `Deferred` to cancel if the client disconnects early and
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# `is_render_cancellable` is set. Expected to be set by `Resource.render`.
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self.render_deferred: Optional["Deferred[None]"] = None
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# A boolean indicating whether `render_deferred` should be cancelled if the
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# client disconnects early. Expected to be set by the coroutine started by
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# `Resource.render`, if rendering is asynchronous.
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self.is_render_cancellable = False
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global _next_request_seq
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self.request_seq = _next_request_seq
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_next_request_seq += 1
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# whether an asynchronous request handler has called processing()
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self._is_processing = False
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# the time when the asynchronous request handler completed its processing
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self._processing_finished_time: Optional[float] = None
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# what time we finished sending the response to the client (or the connection
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# dropped)
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self.finish_time: Optional[float] = None
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def __repr__(self) -> str:
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# We overwrite this so that we don't log ``access_token``
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return "<%s at 0x%x method=%r uri=%r clientproto=%r site=%r>" % (
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self.__class__.__name__,
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id(self),
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self.get_method(),
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self.get_redacted_uri(),
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self.clientproto.decode("ascii", errors="replace"),
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self.synapse_site.site_tag,
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)
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def handleContentChunk(self, data: bytes) -> None:
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# we should have a `content` by now.
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assert self.content, "handleContentChunk() called before gotLength()"
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if self.content.tell() + len(data) > self._max_request_body_size:
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logger.warning(
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"Aborting connection from %s because the request exceeds maximum size: %s %s",
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self.client,
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self.get_method(),
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self.get_redacted_uri(),
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)
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self.transport.abortConnection()
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return
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super().handleContentChunk(data)
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@property
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def requester(self) -> Optional[Union[Requester, str]]:
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return self._requester
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@requester.setter
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def requester(self, value: Union[Requester, str]) -> None:
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# Store the requester, and update some properties based on it.
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# This should only be called once.
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assert self._requester is None
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self._requester = value
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# A logging context should exist by now (and have a ContextRequest).
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assert self.logcontext is not None
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assert self.logcontext.request is not None
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(
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requester,
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authenticated_entity,
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) = self.get_authenticated_entity()
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self.logcontext.request.requester = requester
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# If there's no authenticated entity, it was the requester.
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self.logcontext.request.authenticated_entity = authenticated_entity or requester
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def set_opentracing_span(self, span: "opentracing.Span") -> None:
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"""attach an opentracing span to this request
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Doing so will cause the span to be closed when we finish processing the request
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"""
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self._opentracing_span = span
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def get_request_id(self) -> str:
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request_id_value = None
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if self.request_id_header:
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request_id_value = self.getHeader(self.request_id_header)
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if request_id_value is None:
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request_id_value = str(self.request_seq)
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return "%s-%s" % (self.get_method(), request_id_value)
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def get_redacted_uri(self) -> str:
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"""Gets the redacted URI associated with the request (or placeholder if the URI
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has not yet been received).
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Note: This is necessary as the placeholder value in twisted is str
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rather than bytes, so we need to sanitise `self.uri`.
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Returns:
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The redacted URI as a string.
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"""
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uri: Union[bytes, str] = self.uri
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if isinstance(uri, bytes):
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uri = uri.decode("ascii", errors="replace")
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return redact_uri(uri)
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def get_method(self) -> str:
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"""Gets the method associated with the request (or placeholder if method
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has not yet been received).
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Note: This is necessary as the placeholder value in twisted is str
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rather than bytes, so we need to sanitise `self.method`.
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Returns:
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The request method as a string.
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"""
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method: Union[bytes, str] = self.method
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if isinstance(method, bytes):
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return self.method.decode("ascii")
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return method
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def get_authenticated_entity(self) -> Tuple[Optional[str], Optional[str]]:
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"""
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Get the "authenticated" entity of the request, which might be the user
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performing the action, or a user being puppeted by a server admin.
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Returns:
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A tuple:
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The first item is a string representing the user making the request.
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The second item is a string or None representing the user who
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authenticated when making this request. See
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Requester.authenticated_entity.
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"""
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# Convert the requester into a string that we can log
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if isinstance(self._requester, str):
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return self._requester, None
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elif isinstance(self._requester, Requester):
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requester = self._requester.user.to_string()
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authenticated_entity = self._requester.authenticated_entity
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# If this is a request where the target user doesn't match the user who
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# authenticated (e.g. and admin is puppetting a user) then we return both.
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if requester != authenticated_entity:
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return requester, authenticated_entity
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return requester, None
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elif self._requester is not None:
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# This shouldn't happen, but we log it so we don't lose information
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# and can see that we're doing something wrong.
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return repr(self._requester), None # type: ignore[unreachable]
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return None, None
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def render(self, resrc: Resource) -> None:
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# this is called once a Resource has been found to serve the request; in our
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# case the Resource in question will normally be a JsonResource.
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# create a LogContext for this request
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request_id = self.get_request_id()
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self.logcontext = LoggingContext(
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request_id,
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request=ContextRequest(
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request_id=request_id,
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ip_address=self.get_client_ip_if_available(),
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site_tag=self.synapse_site.site_tag,
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# The requester is going to be unknown at this point.
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requester=None,
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authenticated_entity=None,
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method=self.get_method(),
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url=self.get_redacted_uri(),
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protocol=self.clientproto.decode("ascii", errors="replace"),
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user_agent=get_request_user_agent(self),
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),
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)
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# override the Server header which is set by twisted
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self.setHeader("Server", self.synapse_site.server_version_string)
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with PreserveLoggingContext(self.logcontext):
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# we start the request metrics timer here with an initial stab
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# at the servlet name. For most requests that name will be
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# JsonResource (or a subclass), and JsonResource._async_render
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# will update it once it picks a servlet.
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servlet_name = resrc.__class__.__name__
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self._started_processing(servlet_name)
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Request.render(self, resrc)
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# record the arrival of the request *after*
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# dispatching to the handler, so that the handler
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# can update the servlet name in the request
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# metrics
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requests_counter.labels(self.get_method(), self.request_metrics.name).inc()
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@contextlib.contextmanager
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def processing(self) -> Generator[None, None, None]:
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"""Record the fact that we are processing this request.
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Returns a context manager; the correct way to use this is:
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async def handle_request(request):
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with request.processing("FooServlet"):
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await really_handle_the_request()
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Once the context manager is closed, the completion of the request will be logged,
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and the various metrics will be updated.
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"""
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if self._is_processing:
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raise RuntimeError("Request is already processing")
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self._is_processing = True
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try:
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yield
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except Exception:
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# this should already have been caught, and sent back to the client as a 500.
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logger.exception(
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"Asynchronous message handler raised an uncaught exception"
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)
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finally:
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# the request handler has finished its work and either sent the whole response
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# back, or handed over responsibility to a Producer.
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self._processing_finished_time = time.time()
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self._is_processing = False
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if self._opentracing_span:
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self._opentracing_span.log_kv({"event": "finished processing"})
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# if we've already sent the response, log it now; otherwise, we wait for the
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# response to be sent.
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if self.finish_time is not None:
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self._finished_processing()
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def finish(self) -> None:
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"""Called when all response data has been written to this Request.
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Overrides twisted.web.server.Request.finish to record the finish time and do
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logging.
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"""
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self.finish_time = time.time()
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Request.finish(self)
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if self._opentracing_span:
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self._opentracing_span.log_kv({"event": "response sent"})
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if not self._is_processing:
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assert self.logcontext is not None
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with PreserveLoggingContext(self.logcontext):
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self._finished_processing()
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def connectionLost(self, reason: Union[Failure, Exception]) -> None:
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"""Called when the client connection is closed before the response is written.
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Overrides twisted.web.server.Request.connectionLost to record the finish time and
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do logging.
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"""
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# There is a bug in Twisted where reason is not wrapped in a Failure object
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# Detect this and wrap it manually as a workaround
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# More information: https://github.com/matrix-org/synapse/issues/7441
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if not isinstance(reason, Failure):
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reason = Failure(reason)
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self.finish_time = time.time()
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Request.connectionLost(self, reason)
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if self.logcontext is None:
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logger.info(
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"Connection from %s lost before request headers were read", self.client
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)
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return
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# we only get here if the connection to the client drops before we send
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# the response.
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#
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# It's useful to log it here so that we can get an idea of when
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# the client disconnects.
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with PreserveLoggingContext(self.logcontext):
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logger.info("Connection from client lost before response was sent")
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if self._opentracing_span:
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self._opentracing_span.log_kv(
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{"event": "client connection lost", "reason": str(reason.value)}
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)
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if self._is_processing:
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if self.is_render_cancellable:
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if self.render_deferred is not None:
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# Throw a cancellation into the request processing, in the hope
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# that it will finish up sooner than it normally would.
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# The `self.processing()` context manager will call
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# `_finished_processing()` when done.
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with PreserveLoggingContext():
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self.render_deferred.cancel()
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else:
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logger.error(
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"Connection from client lost, but have no Deferred to "
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"cancel even though the request is marked as cancellable."
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)
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else:
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self._finished_processing()
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def _started_processing(self, servlet_name: str) -> None:
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"""Record the fact that we are processing this request.
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This will log the request's arrival. Once the request completes,
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be sure to call finished_processing.
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Args:
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servlet_name: the name of the servlet which will be
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processing this request. This is used in the metrics.
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It is possible to update this afterwards by updating
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self.request_metrics.name.
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"""
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self.start_time = time.time()
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self.request_metrics = RequestMetrics()
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self.request_metrics.start(
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self.start_time, name=servlet_name, method=self.get_method()
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)
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self.synapse_site.access_logger.debug(
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"%s - %s - Received request: %s %s",
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self.get_client_ip_if_available(),
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self.synapse_site.site_tag,
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self.get_method(),
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self.get_redacted_uri(),
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)
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def _finished_processing(self) -> None:
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"""Log the completion of this request and update the metrics"""
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assert self.logcontext is not None
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assert self.finish_time is not None
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usage = self.logcontext.get_resource_usage()
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if self._processing_finished_time is None:
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# we completed the request without anything calling processing()
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self._processing_finished_time = time.time()
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# the time between receiving the request and the request handler finishing
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processing_time = self._processing_finished_time - self.start_time
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# the time between the request handler finishing and the response being sent
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# to the client (nb may be negative)
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response_send_time = self.finish_time - self._processing_finished_time
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user_agent = get_request_user_agent(self, "-")
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# int(self.code) looks redundant, because self.code is already an int.
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# But self.code might be an HTTPStatus (which inherits from int)---which has
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# a different string representation. So ensure we really have an integer.
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code = str(int(self.code))
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if not self.finished:
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# we didn't send the full response before we gave up (presumably because
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# the connection dropped)
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code += "!"
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log_level = logging.INFO if self._should_log_request() else logging.DEBUG
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# If this is a request where the target user doesn't match the user who
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# authenticated (e.g. and admin is puppetting a user) then we log both.
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requester, authenticated_entity = self.get_authenticated_entity()
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if authenticated_entity:
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requester = f"{authenticated_entity}|{requester}"
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self.synapse_site.access_logger.log(
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log_level,
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"%s - %s - {%s}"
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" Processed request: %.3fsec/%.3fsec (%.3fsec, %.3fsec) (%.3fsec/%.3fsec/%d)"
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' %sB %s "%s %s %s" "%s" [%d dbevts]',
|
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self.get_client_ip_if_available(),
|
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self.synapse_site.site_tag,
|
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requester,
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processing_time,
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response_send_time,
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usage.ru_utime,
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usage.ru_stime,
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usage.db_sched_duration_sec,
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usage.db_txn_duration_sec,
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int(usage.db_txn_count),
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self.sentLength,
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code,
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self.get_method(),
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self.get_redacted_uri(),
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self.clientproto.decode("ascii", errors="replace"),
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user_agent,
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usage.evt_db_fetch_count,
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)
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|
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# complete the opentracing span, if any.
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if self._opentracing_span:
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self._opentracing_span.finish()
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try:
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self.request_metrics.stop(self.finish_time, self.code, self.sentLength)
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except Exception as e:
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logger.warning("Failed to stop metrics: %r", e)
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|
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def _should_log_request(self) -> bool:
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"""Whether we should log at INFO that we processed the request."""
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if self.path == b"/health":
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return False
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|
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if self.method == b"OPTIONS":
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return False
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return True
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|
|
def get_client_ip_if_available(self) -> str:
|
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"""Logging helper. Return something useful when a client IP is not retrievable
|
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from a unix socket.
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In practice, this returns the socket file path on a SynapseRequest if using a
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unix socket and the normal IP address for TCP sockets.
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"""
|
|
# getClientAddress().host returns a proper IP address for a TCP socket. But
|
|
# unix sockets have no concept of IP addresses or ports and return a
|
|
# UNIXAddress containing a 'None' value. In order to get something usable for
|
|
# logs(where this is used) get the unix socket file. getHost() returns a
|
|
# UNIXAddress containing a value of the socket file and has an instance
|
|
# variable of 'name' encoded as a byte string containing the path we want.
|
|
# Decode to utf-8 so it looks nice.
|
|
if isinstance(self.getClientAddress(), UNIXAddress):
|
|
return self.getHost().name.decode("utf-8")
|
|
else:
|
|
return self.getClientAddress().host
|
|
|
|
|
|
class XForwardedForRequest(SynapseRequest):
|
|
"""Request object which honours proxy headers
|
|
|
|
Extends SynapseRequest to replace getClientIP, getClientAddress, and isSecure with
|
|
information from request headers.
|
|
"""
|
|
|
|
# the client IP and ssl flag, as extracted from the headers.
|
|
_forwarded_for: "Optional[_XForwardedForAddress]" = None
|
|
_forwarded_https: bool = False
|
|
|
|
def requestReceived(self, command: bytes, path: bytes, version: bytes) -> None:
|
|
# this method is called by the Channel once the full request has been
|
|
# received, to dispatch the request to a resource.
|
|
# We can use it to set the IP address and protocol according to the
|
|
# headers.
|
|
self._process_forwarded_headers()
|
|
return super().requestReceived(command, path, version)
|
|
|
|
def _process_forwarded_headers(self) -> None:
|
|
headers = self.requestHeaders.getRawHeaders(b"x-forwarded-for")
|
|
if not headers:
|
|
return
|
|
|
|
# for now, we just use the first x-forwarded-for header. Really, we ought
|
|
# to start from the client IP address, and check whether it is trusted; if it
|
|
# is, work backwards through the headers until we find an untrusted address.
|
|
# see https://github.com/matrix-org/synapse/issues/9471
|
|
self._forwarded_for = _XForwardedForAddress(
|
|
headers[0].split(b",")[0].strip().decode("ascii")
|
|
)
|
|
|
|
# if we got an x-forwarded-for header, also look for an x-forwarded-proto header
|
|
header = self.getHeader(b"x-forwarded-proto")
|
|
if header is not None:
|
|
self._forwarded_https = header.lower() == b"https"
|
|
else:
|
|
# this is done largely for backwards-compatibility so that people that
|
|
# haven't set an x-forwarded-proto header don't get a redirect loop.
|
|
logger.warning(
|
|
"forwarded request lacks an x-forwarded-proto header: assuming https"
|
|
)
|
|
self._forwarded_https = True
|
|
|
|
def isSecure(self) -> bool:
|
|
if self._forwarded_https:
|
|
return True
|
|
return super().isSecure()
|
|
|
|
def getClientIP(self) -> str:
|
|
"""
|
|
Return the IP address of the client who submitted this request.
|
|
|
|
This method is deprecated. Use getClientAddress() instead.
|
|
"""
|
|
if self._forwarded_for is not None:
|
|
return self._forwarded_for.host
|
|
return super().getClientIP()
|
|
|
|
def getClientAddress(self) -> IAddress:
|
|
"""
|
|
Return the address of the client who submitted this request.
|
|
"""
|
|
if self._forwarded_for is not None:
|
|
return self._forwarded_for
|
|
return super().getClientAddress()
|
|
|
|
|
|
@implementer(IAddress)
|
|
@attr.s(frozen=True, slots=True, auto_attribs=True)
|
|
class _XForwardedForAddress:
|
|
host: str
|
|
|
|
|
|
class SynapseSite(Site):
|
|
"""
|
|
Synapse-specific twisted http Site
|
|
|
|
This does two main things.
|
|
|
|
First, it replaces the requestFactory in use so that we build SynapseRequests
|
|
instead of regular t.w.server.Requests. All of the constructor params are really
|
|
just parameters for SynapseRequest.
|
|
|
|
Second, it inhibits the log() method called by Request.finish, since SynapseRequest
|
|
does its own logging.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
logger_name: str,
|
|
site_tag: str,
|
|
config: ListenerConfig,
|
|
resource: IResource,
|
|
server_version_string: str,
|
|
max_request_body_size: int,
|
|
reactor: IReactorTime,
|
|
):
|
|
"""
|
|
|
|
Args:
|
|
logger_name: The name of the logger to use for access logs.
|
|
site_tag: A tag to use for this site - mostly in access logs.
|
|
config: Configuration for the HTTP listener corresponding to this site
|
|
resource: The base of the resource tree to be used for serving requests on
|
|
this site
|
|
server_version_string: A string to present for the Server header
|
|
max_request_body_size: Maximum request body length to allow before
|
|
dropping the connection
|
|
reactor: reactor to be used to manage connection timeouts
|
|
"""
|
|
Site.__init__(self, resource, reactor=reactor)
|
|
|
|
self.site_tag = site_tag
|
|
self.reactor = reactor
|
|
|
|
assert config.http_options is not None
|
|
proxied = config.http_options.x_forwarded
|
|
request_class = XForwardedForRequest if proxied else SynapseRequest
|
|
|
|
request_id_header = config.http_options.request_id_header
|
|
|
|
self.experimental_cors_msc3886 = config.http_options.experimental_cors_msc3886
|
|
|
|
def request_factory(channel: HTTPChannel, queued: bool) -> Request:
|
|
return request_class(
|
|
channel,
|
|
self,
|
|
max_request_body_size=max_request_body_size,
|
|
queued=queued,
|
|
request_id_header=request_id_header,
|
|
)
|
|
|
|
self.requestFactory = request_factory # type: ignore
|
|
self.access_logger = logging.getLogger(logger_name)
|
|
self.server_version_string = server_version_string.encode("ascii")
|
|
|
|
def log(self, request: SynapseRequest) -> None:
|
|
pass
|