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# -*- coding: utf-8 -*-
# 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.
from __future__ import print_function
import functools
import sys
from twisted.internet import defer
from twisted.internet.defer import Deferred
from twisted.python.failure import Failure
def do_patch():
"""
Patch defer.inlineCallbacks so that it checks the state of the logcontext on exit
"""
from synapse.util.logcontext import LoggingContext
orig_inline_callbacks = defer.inlineCallbacks
def new_inline_callbacks(f):
orig = orig_inline_callbacks(f)
@functools.wraps(f)
def wrapped(*args, **kwargs):
start_context = LoggingContext.current_context()
try:
res = orig(*args, **kwargs)
except Exception:
if LoggingContext.current_context() != start_context:
err = "%s changed context from %s to %s on exception" % (
f, start_context, LoggingContext.current_context()
)
print(err, file=sys.stderr)
raise Exception(err)
raise
if not isinstance(res, Deferred) or res.called:
if LoggingContext.current_context() != start_context:
err = "%s changed context from %s to %s" % (
f, start_context, LoggingContext.current_context()
)
# print the error to stderr because otherwise all we
# see in travis-ci is the 500 error
print(err, file=sys.stderr)
raise Exception(err)
return res
if LoggingContext.current_context() != LoggingContext.sentinel:
err = (
"%s returned incomplete deferred in non-sentinel context "
"%s (start was %s)"
) % (
f, LoggingContext.current_context(), start_context,
)
print(err, file=sys.stderr)
raise Exception(err)
def check_ctx(r):
if LoggingContext.current_context() != start_context:
err = "%s completion of %s changed context from %s to %s" % (
"Failure" if isinstance(r, Failure) else "Success",
f, start_context, LoggingContext.current_context(),
)
print(err, file=sys.stderr)
raise Exception(err)
return r
res.addBoth(check_ctx)
return res
return wrapped
defer.inlineCallbacks = new_inline_callbacks
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