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Merge pull request #3203 from matrix-org/rav/refactor_request_handler

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Refactor request handling wrappers
This commit is contained in:
Richard van der Hoff 2018-05-10 15:26:53 +01:00 committed by GitHub
commit 7b411007e6
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9 changed files with 346 additions and 258 deletions
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4
synapse/http/additional_resource.py
View File

@ -13,7 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.http.server import wrap_request_handler
from synapse.http.server import wrap_json_request_handler
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
@ -50,6 +50,6 @@ class AdditionalResource(Resource):
self._async_render(request)
return NOT_DONE_YET
@wrap_request_handler
@wrap_json_request_handler
def _async_render(self, request):
return self._handler(request)

149
synapse/http/request_metrics.py Normal file
View File

@ -0,0 +1,149 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import synapse.metrics
from synapse.util.logcontext import LoggingContext
logger = logging.getLogger(__name__)
metrics = synapse.metrics.get_metrics_for("synapse.http.server")
# total number of responses served, split by method/servlet/tag
response_count = metrics.register_counter(
"response_count",
labels=["method", "servlet", "tag"],
alternative_names=(
# the following are all deprecated aliases for the same metric
metrics.name_prefix + x for x in (
"_requests",
"_response_time:count",
"_response_ru_utime:count",
"_response_ru_stime:count",
"_response_db_txn_count:count",
"_response_db_txn_duration:count",
)
)
)
requests_counter = metrics.register_counter(
"requests_received",
labels=["method", "servlet", ],
)
outgoing_responses_counter = metrics.register_counter(
"responses",
labels=["method", "code"],
)
response_timer = metrics.register_counter(
"response_time_seconds",
labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_time:total",
),
)
response_ru_utime = metrics.register_counter(
"response_ru_utime_seconds", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_ru_utime:total",
),
)
response_ru_stime = metrics.register_counter(
"response_ru_stime_seconds", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_ru_stime:total",
),
)
response_db_txn_count = metrics.register_counter(
"response_db_txn_count", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_db_txn_count:total",
),
)
# seconds spent waiting for db txns, excluding scheduling time, when processing
# this request
response_db_txn_duration = metrics.register_counter(
"response_db_txn_duration_seconds", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_db_txn_duration:total",
),
)
# seconds spent waiting for a db connection, when processing this request
response_db_sched_duration = metrics.register_counter(
"response_db_sched_duration_seconds", labels=["method", "servlet", "tag"]
)
# size in bytes of the response written
response_size = metrics.register_counter(
"response_size", labels=["method", "servlet", "tag"]
)
class RequestMetrics(object):
def start(self, time_msec, name):
self.start = time_msec
self.start_context = LoggingContext.current_context()
self.name = name
def stop(self, time_msec, request):
context = LoggingContext.current_context()
tag = ""
if context:
tag = context.tag
if context != self.start_context:
logger.warn(
"Context have unexpectedly changed %r, %r",
context, self.start_context
)
return
outgoing_responses_counter.inc(request.method, str(request.code))
response_count.inc(request.method, self.name, tag)
response_timer.inc_by(
time_msec - self.start, request.method,
self.name, tag
)
ru_utime, ru_stime = context.get_resource_usage()
response_ru_utime.inc_by(
ru_utime, request.method, self.name, tag
)
response_ru_stime.inc_by(
ru_stime, request.method, self.name, tag
)
response_db_txn_count.inc_by(
context.db_txn_count, request.method, self.name, tag
)
response_db_txn_duration.inc_by(
context.db_txn_duration_ms / 1000., request.method, self.name, tag
)
response_db_sched_duration.inc_by(
context.db_sched_duration_ms / 1000., request.method, self.name, tag
)
response_size.inc_by(request.sentLength, request.method, self.name, tag)

246
synapse/http/server.py
View File

@ -18,6 +18,9 @@
from synapse.api.errors import (
cs_exception, SynapseError, CodeMessageException, UnrecognizedRequestError, Codes
)
from synapse.http.request_metrics import (
requests_counter,
)
from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
from synapse.util.caches import intern_dict
from synapse.util.metrics import Measure
@ -41,133 +44,26 @@ import simplejson
logger = logging.getLogger(__name__)
metrics = synapse.metrics.get_metrics_for(__name__)
# total number of responses served, split by method/servlet/tag
response_count = metrics.register_counter(
"response_count",
labels=["method", "servlet", "tag"],
alternative_names=(
# the following are all deprecated aliases for the same metric
metrics.name_prefix + x for x in (
"_requests",
"_response_time:count",
"_response_ru_utime:count",
"_response_ru_stime:count",
"_response_db_txn_count:count",
"_response_db_txn_duration:count",
)
)
)
def wrap_json_request_handler(h):
"""Wraps a request handler method with exception handling.
requests_counter = metrics.register_counter(
"requests_received",
labels=["method", "servlet", ],
)
Also adds logging as per wrap_request_handler_with_logging.
outgoing_responses_counter = metrics.register_counter(
"responses",
labels=["method", "code"],
)
The handler method must have a signature of "handle_foo(self, request)",
where "self" must have "version_string" and "clock" attributes (and
"request" must be a SynapseRequest).
response_timer = metrics.register_counter(
"response_time_seconds",
labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_time:total",
),
)
response_ru_utime = metrics.register_counter(
"response_ru_utime_seconds", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_ru_utime:total",
),
)
response_ru_stime = metrics.register_counter(
"response_ru_stime_seconds", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_ru_stime:total",
),
)
response_db_txn_count = metrics.register_counter(
"response_db_txn_count", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_db_txn_count:total",
),
)
# seconds spent waiting for db txns, excluding scheduling time, when processing
# this request
response_db_txn_duration = metrics.register_counter(
"response_db_txn_duration_seconds", labels=["method", "servlet", "tag"],
alternative_names=(
metrics.name_prefix + "_response_db_txn_duration:total",
),
)
# seconds spent waiting for a db connection, when processing this request
response_db_sched_duration = metrics.register_counter(
"response_db_sched_duration_seconds", labels=["method", "servlet", "tag"]
)
# size in bytes of the response written
response_size = metrics.register_counter(
"response_size", labels=["method", "servlet", "tag"]
)
_next_request_id = 0
def request_handler(include_metrics=False):
"""Decorator for ``wrap_request_handler``"""
return lambda request_handler: wrap_request_handler(request_handler, include_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.
The method must have a signature of "handle_foo(self, request)". The
argument "self" must have "version_string" and "clock" attributes. The
argument "request" must be a twisted HTTP request.
The method must return a deferred. If the deferred succeeds we assume that
The handler must return a deferred. If the deferred succeeds we assume that
a response has been sent. If the deferred fails with a SynapseError we use
it to send a JSON response with the appropriate HTTP reponse code. If the
deferred fails with any other type of error we send a 500 reponse.
We insert a unique request-id into the logging context for this request and
log the response and duration for this request.
"""
@defer.inlineCallbacks
def wrapped_request_handler(self, request):
global _next_request_id
request_id = "%s-%s" % (request.method, _next_request_id)
_next_request_id += 1
with LoggingContext(request_id) as request_context:
with Measure(self.clock, "wrapped_request_handler"):
request_metrics = RequestMetrics()
# we start the request metrics timer here with an initial stab
# at the servlet name. For most requests that name will be
# JsonResource (or a subclass), and JsonResource._async_render
# will update it once it picks a servlet.
servlet_name = self.__class__.__name__
request_metrics.start(self.clock, name=servlet_name)
request_context.request = request_id
with request.processing():
try:
with PreserveLoggingContext(request_context):
if include_metrics:
yield request_handler(self, request, request_metrics)
else:
requests_counter.inc(request.method, servlet_name)
yield request_handler(self, request)
yield h(self, request)
except CodeMessageException as e:
code = e.code
if isinstance(e, SynapseError):
@ -176,22 +72,20 @@ def wrap_request_handler(request_handler, include_metrics=False):
)
else:
logger.exception(e)
outgoing_responses_counter.inc(request.method, str(code))
respond_with_json(
request, code, cs_exception(e), send_cors=True,
pretty_print=_request_user_agent_is_curl(request),
version_string=self.version_string,
)
except Exception:
# failure.Failure() fishes the original Failure out
# of our stack, and thus gives us a sensible stack
# trace.
f = failure.Failure()
logger.error(
"Failed handle request %s.%s on %r: %r: %s",
request_handler.__module__,
request_handler.__name__,
self,
"Failed handle request via %r: %r: %s",
h,
request,
f.getTraceback().rstrip(),
)
@ -206,13 +100,49 @@ def wrap_request_handler(request_handler, include_metrics=False):
pretty_print=_request_user_agent_is_curl(request),
version_string=self.version_string,
)
finally:
try:
request_metrics.stop(
self.clock, request
)
except Exception as e:
logger.warn("Failed to stop metrics: %r", e)
return wrap_request_handler_with_logging(wrapped_request_handler)
def wrap_request_handler_with_logging(h):
"""Wraps a request handler to provide logging and metrics
The handler method must have a signature of "handle_foo(self, request)",
where "self" must have a "clock" attribute (and "request" must be a
SynapseRequest).
As well as calling `request.processing` (which will log the response and
duration for this request), the wrapped request handler will insert the
request id into the logging context.
"""
@defer.inlineCallbacks
def wrapped_request_handler(self, request):
"""
Args:
self:
request (synapse.http.site.SynapseRequest):
"""
request_id = request.get_request_id()
with LoggingContext(request_id) as request_context:
request_context.request = request_id
with Measure(self.clock, "wrapped_request_handler"):
# we start the request metrics timer here with an initial stab
# at the servlet name. For most requests that name will be
# JsonResource (or a subclass), and JsonResource._async_render
# will update it once it picks a servlet.
servlet_name = self.__class__.__name__
with request.processing(servlet_name):
with PreserveLoggingContext(request_context):
d = h(self, request)
# record the arrival of the request *after*
# dispatching to the handler, so that the handler
# can update the servlet name in the request
# metrics
requests_counter.inc(request.method,
request.request_metrics.name)
yield d
return wrapped_request_handler
@ -278,13 +208,9 @@ class JsonResource(HttpServer, resource.Resource):
self._async_render(request)
return server.NOT_DONE_YET
# Disable metric reporting because _async_render does its own metrics.
# 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(include_metrics=True)
@wrap_json_request_handler
@defer.inlineCallbacks
def _async_render(self, request, request_metrics):
def _async_render(self, request):
""" 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.
@ -296,9 +222,7 @@ class JsonResource(HttpServer, resource.Resource):
servlet_classname = servlet_instance.__class__.__name__
else:
servlet_classname = "%r" % callback
request_metrics.name = servlet_classname
requests_counter.inc(request.method, servlet_classname)
request.request_metrics.name = servlet_classname
# Now trigger the callback. If it returns a response, we send it
# here. If it throws an exception, that is handled by the wrapper
@ -345,8 +269,6 @@ class JsonResource(HttpServer, resource.Resource):
def _send_response(self, request, code, response_json_object,
response_code_message=None):
outgoing_responses_counter.inc(request.method, str(code))
# TODO: Only enable CORS for the requests that need it.
respond_with_json(
request, code, response_json_object,
@ -386,54 +308,6 @@ def _unrecognised_request_handler(request):
raise UnrecognizedRequestError()
class RequestMetrics(object):
def start(self, clock, name):
self.start = clock.time_msec()
self.start_context = LoggingContext.current_context()
self.name = name
def stop(self, clock, request):
context = LoggingContext.current_context()
tag = ""
if context:
tag = context.tag
if context != self.start_context:
logger.warn(
"Context have unexpectedly changed %r, %r",
context, self.start_context
)
return
response_count.inc(request.method, self.name, tag)
response_timer.inc_by(
clock.time_msec() - self.start, request.method,
self.name, tag
)
ru_utime, ru_stime = context.get_resource_usage()
response_ru_utime.inc_by(
ru_utime, request.method, self.name, tag
)
response_ru_stime.inc_by(
ru_stime, request.method, self.name, tag
)
response_db_txn_count.inc_by(
context.db_txn_count, request.method, self.name, tag
)
response_db_txn_duration.inc_by(
context.db_txn_duration_ms / 1000., request.method, self.name, tag
)
response_db_sched_duration.inc_by(
context.db_sched_duration_ms / 1000., request.method, self.name, tag
)
response_size.inc_by(request.sentLength, request.method, self.name, tag)
class RootRedirect(resource.Resource):
"""Redirects the root '/' path to another path."""

78
synapse/http/site.py
View File

@ -12,24 +12,48 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.util.logcontext import LoggingContext
from twisted.web.server import Site, Request
import contextlib
import logging
import re
import time
from twisted.web.server import Site, Request
from synapse.http.request_metrics import RequestMetrics
from synapse.util.logcontext import LoggingContext
logger = logging.getLogger(__name__)
ACCESS_TOKEN_RE = re.compile(br'(\?.*access(_|%5[Ff])token=)[^&]*(.*)$')
_next_request_seq = 0
class SynapseRequest(Request):
"""Class which encapsulates an HTTP request to synapse.
All of the requests processed in synapse are of this type.
It extends twisted's twisted.web.server.Request, and adds:
* Unique request ID
* Redaction of access_token query-params in __repr__
* Logging at start and end
* Metrics to record CPU, wallclock and DB time by endpoint.
It provides a method `processing` which should be called by the Resource
which is handling the request, and returns a context manager.
"""
def __init__(self, site, *args, **kw):
Request.__init__(self, *args, **kw)
self.site = site
self.authenticated_entity = None
self.start_time = 0
global _next_request_seq
self.request_seq = _next_request_seq
_next_request_seq += 1
def __repr__(self):
# We overwrite this so that we don't log ``access_token``
return '<%s at 0x%x method=%s uri=%s clientproto=%s site=%s>' % (
@ -41,6 +65,9 @@ class SynapseRequest(Request):
self.site.site_tag,
)
def get_request_id(self):
return "%s-%i" % (self.method, self.request_seq)
def get_redacted_uri(self):
return ACCESS_TOKEN_RE.sub(
br'\1<redacted>\3',
@ -50,7 +77,11 @@ class SynapseRequest(Request):
def get_user_agent(self):
return self.requestHeaders.getRawHeaders(b"User-Agent", [None])[-1]
def started_processing(self):
def _started_processing(self, servlet_name):
self.start_time = int(time.time() * 1000)
self.request_metrics = RequestMetrics()
self.request_metrics.start(self.start_time, name=servlet_name)
self.site.access_logger.info(
"%s - %s - Received request: %s %s",
self.getClientIP(),
@ -58,10 +89,8 @@ class SynapseRequest(Request):
self.method,
self.get_redacted_uri()
)
self.start_time = int(time.time() * 1000)
def finished_processing(self):
def _finished_processing(self):
try:
context = LoggingContext.current_context()
ru_utime, ru_stime = context.get_resource_usage()
@ -72,6 +101,8 @@ class SynapseRequest(Request):
ru_utime, ru_stime = (0, 0)
db_txn_count, db_txn_duration_ms = (0, 0)
end_time = int(time.time() * 1000)
self.site.access_logger.info(
"%s - %s - {%s}"
" Processed request: %dms (%dms, %dms) (%dms/%dms/%d)"
@ -79,7 +110,7 @@ class SynapseRequest(Request):
self.getClientIP(),
self.site.site_tag,
self.authenticated_entity,
int(time.time() * 1000) - self.start_time,
end_time - self.start_time,
int(ru_utime * 1000),
int(ru_stime * 1000),
db_sched_duration_ms,
@ -93,11 +124,36 @@ class SynapseRequest(Request):
self.get_user_agent(),
)
try:
self.request_metrics.stop(end_time, self)
except Exception as e:
logger.warn("Failed to stop metrics: %r", e)
@contextlib.contextmanager
def processing(self):
self.started_processing()
def processing(self, servlet_name):
"""Record the fact that we are processing this request.
Returns a context manager; the correct way to use this is:
@defer.inlineCallbacks
def handle_request(request):
with request.processing("FooServlet"):
yield really_handle_the_request()
This will log the request's arrival. Once the context manager is
closed, the completion of the request will be logged, and the various
metrics will be updated.
Args:
servlet_name (str): the name of the servlet which will be
processing this request. This is used in the metrics.
It is possible to update this afterwards by updating
self.request_metrics.servlet_name.
"""
self._started_processing(servlet_name)
yield
self.finished_processing()
self._finished_processing()
class XForwardedForRequest(SynapseRequest):

8
synapse/rest/key/v2/remote_key_resource.py
View File

@ -12,7 +12,9 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.http.server import request_handler, respond_with_json_bytes
from synapse.http.server import (
respond_with_json_bytes, wrap_json_request_handler,
)
from synapse.http.servlet import parse_integer, parse_json_object_from_request
from synapse.api.errors import SynapseError, Codes
from synapse.crypto.keyring import KeyLookupError
@ -99,7 +101,7 @@ class RemoteKey(Resource):
self.async_render_GET(request)
return NOT_DONE_YET
@request_handler()
@wrap_json_request_handler
@defer.inlineCallbacks
def async_render_GET(self, request):
if len(request.postpath) == 1:
@ -124,7 +126,7 @@ class RemoteKey(Resource):
self.async_render_POST(request)
return NOT_DONE_YET
@request_handler()
@wrap_json_request_handler
@defer.inlineCallbacks
def async_render_POST(self, request):
content = parse_json_object_from_request(request)

22
synapse/rest/media/v1/download_resource.py
View File

@ -12,17 +12,19 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import synapse.http.servlet
from ._base import parse_media_id, respond_404
from twisted.web.resource import Resource
from synapse.http.server import request_handler, set_cors_headers
from twisted.web.server import NOT_DONE_YET
from twisted.internet import defer
import logging
from twisted.internet import defer
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.http.server import (
set_cors_headers,
wrap_json_request_handler,
)
import synapse.http.servlet
from ._base import parse_media_id, respond_404
logger = logging.getLogger(__name__)
@ -43,7 +45,7 @@ class DownloadResource(Resource):
self._async_render_GET(request)
return NOT_DONE_YET
@request_handler()
@wrap_json_request_handler
@defer.inlineCallbacks
def _async_render_GET(self, request):
set_cors_headers(request)

5
synapse/rest/media/v1/preview_url_resource.py
View File

@ -40,8 +40,9 @@ from synapse.util.stringutils import random_string
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.http.client import SpiderHttpClient
from synapse.http.server import (
request_handler, respond_with_json_bytes,
respond_with_json_bytes,
respond_with_json,
wrap_json_request_handler,
)
from synapse.util.async import ObservableDeferred
from synapse.util.stringutils import is_ascii
@ -90,7 +91,7 @@ class PreviewUrlResource(Resource):
self._async_render_GET(request)
return NOT_DONE_YET
@request_handler()
@wrap_json_request_handler
@defer.inlineCallbacks
def _async_render_GET(self, request):

23
synapse/rest/media/v1/thumbnail_resource.py
View File

@ -14,18 +14,21 @@
# limitations under the License.
import logging
from twisted.internet import defer
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.http.server import (
set_cors_headers,
wrap_json_request_handler,
)
from synapse.http.servlet import parse_integer, parse_string
from ._base import (
parse_media_id, respond_404, respond_with_file, FileInfo,
FileInfo, parse_media_id, respond_404, respond_with_file,
respond_with_responder,
)
from twisted.web.resource import Resource
from synapse.http.servlet import parse_string, parse_integer
from synapse.http.server import request_handler, set_cors_headers
from twisted.web.server import NOT_DONE_YET
from twisted.internet import defer
import logging
logger = logging.getLogger(__name__)
@ -48,7 +51,7 @@ class ThumbnailResource(Resource):
self._async_render_GET(request)
return NOT_DONE_YET
@request_handler()
@wrap_json_request_handler
@defer.inlineCallbacks
def _async_render_GET(self, request):
set_cors_headers(request)

19
synapse/rest/media/v1/upload_resource.py
View File

@ -13,16 +13,17 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.http.server import respond_with_json, request_handler
import logging
from twisted.internet import defer
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.api.errors import SynapseError
from twisted.web.server import NOT_DONE_YET
from twisted.internet import defer
from twisted.web.resource import Resource
import logging
from synapse.http.server import (
respond_with_json,
wrap_json_request_handler,
)
logger = logging.getLogger(__name__)
@ -51,7 +52,7 @@ class UploadResource(Resource):
respond_with_json(request, 200, {}, send_cors=True)
return NOT_DONE_YET
@request_handler()
@wrap_json_request_handler
@defer.inlineCallbacks
def _async_render_POST(self, request):
requester = yield self.auth.get_user_by_req(request)