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Merge pull request #3700 from matrix-org/rav/wait_for_producers
Refactor request logging code
This commit is contained in:
Richard van der Hoff
GitHub
commit
3f8709ffe4
1
changelog.d/3700.bugfix
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1
changelog.d/3700.bugfix
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@ -0,0 +1 @@
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Improve HTTP request logging to include all requests
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@ -25,7 +25,7 @@ from canonicaljson import encode_canonical_json, encode_pretty_printed_json, jso
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from twisted.internet import defer
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from twisted.python import failure
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from twisted.web import resource, server
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from twisted.web import resource
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from twisted.web.server import NOT_DONE_YET
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from twisted.web.util import redirectTo
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@ -37,10 +37,8 @@ from synapse.api.errors import (
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SynapseError,
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UnrecognizedRequestError,
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)
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from synapse.http.request_metrics import requests_counter
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from synapse.util.caches import intern_dict
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from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
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from synapse.util.metrics import Measure
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from synapse.util.logcontext import preserve_fn
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logger = logging.getLogger(__name__)
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@ -60,11 +58,10 @@ HTML_ERROR_TEMPLATE = """<!DOCTYPE html>
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def wrap_json_request_handler(h):
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"""Wraps a request handler method with exception handling.
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Also adds logging as per wrap_request_handler_with_logging.
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Also does the wrapping with request.processing as per wrap_async_request_handler.
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The handler method must have a signature of "handle_foo(self, request)",
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where "self" must have a "clock" attribute (and "request" must be a
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SynapseRequest).
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where "request" must be a SynapseRequest.
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The handler must return a deferred. If the deferred succeeds we assume that
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a response has been sent. If the deferred fails with a SynapseError we use
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@ -108,24 +105,23 @@ def wrap_json_request_handler(h):
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pretty_print=_request_user_agent_is_curl(request),
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)
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return wrap_request_handler_with_logging(wrapped_request_handler)
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return wrap_async_request_handler(wrapped_request_handler)
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def wrap_html_request_handler(h):
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"""Wraps a request handler method with exception handling.
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Also adds logging as per wrap_request_handler_with_logging.
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Also does the wrapping with request.processing as per wrap_async_request_handler.
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The handler method must have a signature of "handle_foo(self, request)",
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where "self" must have a "clock" attribute (and "request" must be a
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SynapseRequest).
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where "request" must be a SynapseRequest.
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"""
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def wrapped_request_handler(self, request):
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d = defer.maybeDeferred(h, self, request)
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d.addErrback(_return_html_error, request)
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return d
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return wrap_request_handler_with_logging(wrapped_request_handler)
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return wrap_async_request_handler(wrapped_request_handler)
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def _return_html_error(f, request):
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@ -170,46 +166,26 @@ def _return_html_error(f, request):
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finish_request(request)
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def wrap_request_handler_with_logging(h):
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"""Wraps a request handler to provide logging and metrics
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def wrap_async_request_handler(h):
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"""Wraps an async request handler so that it calls request.processing.
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This helps ensure that work done by the request handler after the request is completed
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is correctly recorded against the request metrics/logs.
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The handler method must have a signature of "handle_foo(self, request)",
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where "self" must have a "clock" attribute (and "request" must be a
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SynapseRequest).
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where "request" must be a SynapseRequest.
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As well as calling `request.processing` (which will log the response and
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duration for this request), the wrapped request handler will insert the
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request id into the logging context.
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The handler may return a deferred, in which case the completion of the request isn't
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logged until the deferred completes.
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"""
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@defer.inlineCallbacks
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def wrapped_request_handler(self, request):
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"""
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Args:
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self:
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request (synapse.http.site.SynapseRequest):
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"""
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def wrapped_async_request_handler(self, request):
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with request.processing():
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yield h(self, request)
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request_id = request.get_request_id()
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with LoggingContext(request_id) as request_context:
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request_context.request = request_id
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with Measure(self.clock, "wrapped_request_handler"):
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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 = self.__class__.__name__
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with request.processing(servlet_name):
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with PreserveLoggingContext(request_context):
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d = defer.maybeDeferred(h, self, request)
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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(request.method,
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request.request_metrics.name).inc()
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yield d
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return wrapped_request_handler
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# we need to preserve_fn here, because the synchronous render method won't yield for
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# us (obviously)
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return preserve_fn(wrapped_async_request_handler)
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class HttpServer(object):
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@ -272,7 +248,7 @@ class JsonResource(HttpServer, resource.Resource):
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""" This gets called by twisted every time someone sends us a request.
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"""
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self._async_render(request)
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return server.NOT_DONE_YET
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return NOT_DONE_YET
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@wrap_json_request_handler
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@defer.inlineCallbacks
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@ -11,7 +11,6 @@
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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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@ -19,8 +18,8 @@ import time
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from twisted.web.server import Request, Site
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from synapse.http import redact_uri
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from synapse.http.request_metrics import RequestMetrics
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from synapse.util.logcontext import ContextResourceUsage, LoggingContext
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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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logger = logging.getLogger(__name__)
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@ -34,25 +33,43 @@ class SynapseRequest(Request):
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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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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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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(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
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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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# 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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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 = 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 = None
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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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@ -74,11 +91,116 @@ class SynapseRequest(Request):
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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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# 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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logcontext = self.logcontext = LoggingContext(request_id)
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logcontext.request = request_id
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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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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.method,
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self.request_metrics.name).inc()
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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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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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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("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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self._processing_finished_time = time.time()
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self._is_processing = False
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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):
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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 not self._is_processing:
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with PreserveLoggingContext(self.logcontext):
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self._finished_processing()
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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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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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# 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: %s %s", reason.type, reason.value,
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)
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if not self._is_processing:
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self._finished_processing()
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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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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 (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.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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@ -94,13 +216,21 @@ class SynapseRequest(Request):
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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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usage = context.get_resource_usage()
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except Exception:
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usage = ContextResourceUsage()
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"""Log the completion of this request and update the metrics
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"""
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end_time = time.time()
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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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# 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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@ -116,22 +246,31 @@ class SynapseRequest(Request):
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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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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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self.site.access_logger.info(
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"%s - %s - {%s}"
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" Processed request: %.3fsec (%.3fsec, %.3fsec) (%.3fsec/%.3fsec/%d)"
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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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end_time - self.start_time,
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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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self.code,
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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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@ -140,38 +279,10 @@ class SynapseRequest(Request):
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)
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try:
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self.request_metrics.stop(end_time, self)
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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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@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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