216 lines
7.0 KiB
Python
216 lines
7.0 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 re
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import time
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from twisted.web.server import Site, Request
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from synapse.http.request_metrics import RequestMetrics
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from synapse.util.logcontext import LoggingContext
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logger = logging.getLogger(__name__)
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ACCESS_TOKEN_RE = re.compile(br'(\?.*access(_|%5[Ff])token=)[^&]*(.*)$')
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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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* 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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It provides a method `processing` which should be called by the Resource
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which is handling the request, and returns a context manager.
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"""
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def __init__(self, site, *args, **kw):
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Request.__init__(self, *args, **kw)
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self.site = site
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self.authenticated_entity = None
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self.start_time = 0
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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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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=%s uri=%s clientproto=%s site=%s>' % (
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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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def get_request_id(self):
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return "%s-%i" % (self.method, self.request_seq)
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def get_redacted_uri(self):
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return ACCESS_TOKEN_RE.sub(
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br'\1<redacted>\3',
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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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def render(self, resrc):
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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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return Request.render(self, resrc)
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def _started_processing(self, servlet_name):
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self.start_time = int(time.time() * 1000)
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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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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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def _finished_processing(self):
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try:
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context = LoggingContext.current_context()
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ru_utime, ru_stime = context.get_resource_usage()
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db_txn_count = context.db_txn_count
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db_txn_duration_ms = context.db_txn_duration_ms
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db_sched_duration_ms = context.db_sched_duration_ms
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except Exception:
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ru_utime, ru_stime = (0, 0)
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db_txn_count, db_txn_duration_ms = (0, 0)
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end_time = int(time.time() * 1000)
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self.site.access_logger.info(
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"%s - %s - {%s}"
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" Processed request: %dms (%dms, %dms) (%dms/%dms/%d)"
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" %sB %s \"%s %s %s\" \"%s\"",
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self.getClientIP(),
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self.site.site_tag,
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self.authenticated_entity,
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end_time - self.start_time,
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int(ru_utime * 1000),
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int(ru_stime * 1000),
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db_sched_duration_ms,
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db_txn_duration_ms,
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int(db_txn_count),
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self.sentLength,
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self.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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self.get_user_agent(),
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)
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try:
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self.request_metrics.stop(end_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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@contextlib.contextmanager
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def processing(self, servlet_name):
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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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@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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This will log the request's arrival. Once the context manager is
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closed, the completion of the request will be logged, and the various
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metrics will be updated.
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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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It is possible to update this afterwards by updating
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self.request_metrics.servlet_name.
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"""
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# TODO: we should probably just move this into render() and finish(),
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# to save having to call a separate method.
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self._started_processing(servlet_name)
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yield
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self._finished_processing()
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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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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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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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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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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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self.site_tag = site_tag
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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
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def log(self, request):
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pass
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