Allow request handlers to override metric name

This commit is contained in:
Erik Johnston 2016-08-22 10:44:45 +01:00
parent a093fab253
commit 8c52160b07

View File

@ -75,12 +75,12 @@ response_db_txn_duration = metrics.register_distribution(
_next_request_id = 0
def request_handler(report_metrics=True):
def request_handler(include_metrics=False):
"""Decorator for ``wrap_request_handler``"""
return lambda request_handler: wrap_request_handler(request_handler, report_metrics)
return lambda request_handler: wrap_request_handler(request_handler, include_metrics)
def wrap_request_handler(request_handler, report_metrics):
def wrap_request_handler(request_handler, include_metrics=False):
"""Wraps a method that acts as a request handler with the necessary logging
and exception handling.
@ -105,15 +105,17 @@ def wrap_request_handler(request_handler, report_metrics):
with LoggingContext(request_id) as request_context:
with Measure(self.clock, "wrapped_request_handler"):
if report_metrics:
request_metrics = RequestMetrics()
request_metrics.start(self.clock)
request_metrics = RequestMetrics()
request_metrics.start(self.clock, name=self.__class__.__name__)
request_context.request = request_id
with request.processing():
try:
with PreserveLoggingContext(request_context):
yield request_handler(self, request)
if include_metrics:
yield request_handler(self, request, request_metrics)
else:
yield request_handler(self, request)
except CodeMessageException as e:
code = e.code
if isinstance(e, SynapseError):
@ -147,10 +149,9 @@ def wrap_request_handler(request_handler, report_metrics):
)
finally:
try:
if report_metrics:
request_metrics.stop(
self.clock, request, self.__class__.__name__
)
request_metrics.stop(
self.clock, request, self.__class__.__name__
)
except:
pass
return wrapped_request_handler
@ -222,9 +223,9 @@ class JsonResource(HttpServer, resource.Resource):
# It does its own metric reporting because _async_render dispatches to
# a callback and it's the class name of that callback we want to report
# against rather than the JsonResource itself.
@request_handler()
@request_handler(include_metrics=True)
@defer.inlineCallbacks
def _async_render(self, request):
def _async_render(self, request, request_metrics):
""" This gets called from render() every time someone sends us a request.
This checks if anyone has registered a callback for that method and
path.
@ -256,6 +257,14 @@ class JsonResource(HttpServer, resource.Resource):
code, response = callback_return
self._send_response(request, code, response)
servlet_instance = getattr(callback, "__self__", None)
if servlet_instance is not None:
servlet_classname = servlet_instance.__class__.__name__
else:
servlet_classname = "%r" % callback
request_metrics.name = servlet_classname
return
# Huh. No one wanted to handle that? Fiiiiiine. Send 400.
@ -286,11 +295,12 @@ class JsonResource(HttpServer, resource.Resource):
class RequestMetrics(object):
def start(self, clock):
def start(self, clock, name):
self.start = clock.time_msec()
self.start_context = LoggingContext.current_context()
self.name = name
def stop(self, clock, request, servlet_classname):
def stop(self, clock, request):
context = LoggingContext.current_context()
tag = ""
@ -304,26 +314,26 @@ class RequestMetrics(object):
)
return
incoming_requests_counter.inc(request.method, servlet_classname, tag)
incoming_requests_counter.inc(request.method, self.name, tag)
response_timer.inc_by(
clock.time_msec() - self.start, request.method,
servlet_classname, tag
self.name, tag
)
ru_utime, ru_stime = context.get_resource_usage()
response_ru_utime.inc_by(
ru_utime, request.method, servlet_classname, tag
ru_utime, request.method, self.name, tag
)
response_ru_stime.inc_by(
ru_stime, request.method, servlet_classname, tag
ru_stime, request.method, self.name, tag
)
response_db_txn_count.inc_by(
context.db_txn_count, request.method, servlet_classname, tag
context.db_txn_count, request.method, self.name, tag
)
response_db_txn_duration.inc_by(
context.db_txn_duration, request.method, servlet_classname, tag
context.db_txn_duration, request.method, self.name, tag
)