341 lines
		
	
	
		
			12 KiB
		
	
	
	
		
			Python
		
	
	
			
		
		
	
	
			341 lines
		
	
	
		
			12 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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| 
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| from twisted.web.server import Request, Site
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| 
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| from synapse.http import redact_uri
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| from synapse.http.request_metrics import RequestMetrics, requests_counter
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| from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
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| 
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| logger = logging.getLogger(__name__)
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| 
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| _next_request_seq = 0
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| 
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| 
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| class SynapseRequest(Request):
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|     """Class which encapsulates an HTTP request to synapse.
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| 
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|     All of the requests processed in synapse are of this type.
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| 
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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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| 
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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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| 
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|     Attributes:
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|         logcontext(LoggingContext) : the log context for this request
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|     """
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|     def __init__(self, site, channel, *args, **kw):
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|         Request.__init__(self, channel, *args, **kw)
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|         self.site = site
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|         self._channel = channel     # this is used by the tests
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|         self.authenticated_entity = None
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|         self.start_time = 0
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| 
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|         # we can't yet create the logcontext, as we don't know the method.
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|         self.logcontext = None
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| 
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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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| 
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|         # whether an asynchronous request handler has called processing()
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|         self._is_processing = False
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| 
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|         # the time when the asynchronous request handler completed its processing
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|         self._processing_finished_time = None
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| 
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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 = None
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| 
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|     def __repr__(self):
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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.method,
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|             self.get_redacted_uri(),
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|             self.clientproto,
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|             self.site.site_tag,
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|         )
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| 
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|     def get_request_id(self):
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|         return "%s-%i" % (self.method, self.request_seq)
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| 
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|     def get_redacted_uri(self):
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|         return redact_uri(self.uri)
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| 
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|     def get_user_agent(self):
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|         return self.requestHeaders.getRawHeaders(b"User-Agent", [None])[-1]
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| 
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|     def render(self, resrc):
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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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| 
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|         # create a LogContext for this request
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|         request_id = self.get_request_id()
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|         logcontext = self.logcontext = LoggingContext(request_id)
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|         logcontext.request = request_id
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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.site.server_version_string)
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| 
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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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| 
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|             Request.render(self, resrc)
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| 
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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.method,
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|                                     self.request_metrics.name).inc()
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| 
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|     @contextlib.contextmanager
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|     def processing(self):
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|         """Record the fact that we are processing this request.
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| 
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|         Returns a context manager; the correct way to use this is:
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| 
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|         @defer.inlineCallbacks
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|         def handle_request(request):
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|             with request.processing("FooServlet"):
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|                 yield really_handle_the_request()
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| 
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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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| 
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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("Asynchronous messge handler raised an uncaught exception")
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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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| 
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|             self._processing_finished_time = time.time()
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|             self._is_processing = False
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| 
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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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| 
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|     def finish(self):
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|         """Called when all response data has been written to this Request.
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| 
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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 not self._is_processing:
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|             with PreserveLoggingContext(self.logcontext):
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|                 self._finished_processing()
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| 
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|     def connectionLost(self, reason):
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|         """Called when the client connection is closed before the response is written.
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| 
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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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|         self.finish_time = time.time()
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|         Request.connectionLost(self, reason)
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| 
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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.warn(
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|                 "Error processing request %r: %s %s", self, reason.type, reason.value,
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|             )
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| 
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|             if not self._is_processing:
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|                 self._finished_processing()
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| 
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|     def _started_processing(self, servlet_name):
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|         """Record the fact that we are processing this request.
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| 
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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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| 
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|         Args:
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|             servlet_name (str): 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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| 
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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.method,
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|         )
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| 
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|         self.site.access_logger.info(
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|             "%s - %s - Received request: %s %s",
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|             self.getClientIP(),
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|             self.site.site_tag,
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|             self.method,
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|             self.get_redacted_uri()
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|         )
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| 
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|     def _finished_processing(self):
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|         """Log the completion of this request and update the metrics
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|         """
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| 
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|         if self.logcontext is None:
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|             # this can happen if the connection closed before we read the
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|             # headers (so render was never called). In that case we'll already
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|             # have logged a warning, so just bail out.
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|             return
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| 
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|         usage = self.logcontext.get_resource_usage()
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| 
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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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| 
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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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| 
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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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| 
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|         # need to decode as it could be raw utf-8 bytes
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|         # from a IDN servname in an auth header
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|         authenticated_entity = self.authenticated_entity
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|         if authenticated_entity is not None and isinstance(authenticated_entity, bytes):
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|             authenticated_entity = authenticated_entity.decode("utf-8", "replace")
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| 
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|         # ...or could be raw utf-8 bytes in the User-Agent header.
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|         # N.B. if you don't do this, the logger explodes cryptically
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|         # with maximum recursion trying to log errors about
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|         # the charset problem.
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|         # c.f. https://github.com/matrix-org/synapse/issues/3471
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|         user_agent = self.get_user_agent()
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|         if user_agent is not None:
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|             user_agent = user_agent.decode("utf-8", "replace")
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|         else:
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|             user_agent = "-"
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| 
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|         code = str(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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| 
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|         self.site.access_logger.info(
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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.getClientIP(),
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|             self.site.site_tag,
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|             authenticated_entity,
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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.method,
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|             self.get_redacted_uri(),
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|             self.clientproto,
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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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|         try:
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|             self.request_metrics.stop(self.finish_time, self)
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|         except Exception as e:
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|             logger.warn("Failed to stop metrics: %r", e)
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| 
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| 
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| class XForwardedForRequest(SynapseRequest):
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|     def __init__(self, *args, **kw):
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|         SynapseRequest.__init__(self, *args, **kw)
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| 
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|     """
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|     Add a layer on top of another request that only uses the value of an
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|     X-Forwarded-For header as the result of C{getClientIP}.
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|     """
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|     def getClientIP(self):
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|         """
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|         @return: The client address (the first address) in the value of the
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|             I{X-Forwarded-For header}.  If the header is not present, return
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|             C{b"-"}.
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|         """
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|         return self.requestHeaders.getRawHeaders(
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|             b"x-forwarded-for", [b"-"])[0].split(b",")[0].strip()
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| 
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| 
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| class SynapseRequestFactory(object):
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|     def __init__(self, site, x_forwarded_for):
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|         self.site = site
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|         self.x_forwarded_for = x_forwarded_for
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| 
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|     def __call__(self, *args, **kwargs):
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|         if self.x_forwarded_for:
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|             return XForwardedForRequest(self.site, *args, **kwargs)
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|         else:
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|             return SynapseRequest(self.site, *args, **kwargs)
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| 
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| 
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| class SynapseSite(Site):
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|     """
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|     Subclass of a twisted http Site that does access logging with python's
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|     standard logging
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|     """
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|     def __init__(self, logger_name, site_tag, config, resource,
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|                  server_version_string, *args, **kwargs):
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|         Site.__init__(self, resource, *args, **kwargs)
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| 
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|         self.site_tag = site_tag
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| 
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|         proxied = config.get("x_forwarded", False)
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|         self.requestFactory = SynapseRequestFactory(self, proxied)
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|         self.access_logger = logging.getLogger(logger_name)
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|         self.server_version_string = server_version_string.encode('ascii')
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| 
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|     def log(self, request):
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|         pass
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