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synapse/tests/util/test_logcontext.py
Richard van der Hoff 44a498418c Optimise LoggingContext creation and copying
It turns out that the only thing we use the __dict__ of LoggingContext for is
`request`, and given we create lots of LoggingContexts and then copy them every
time we do a db transaction or log line, using the __dict__ seems a bit
redundant. Let's try to optimise things by making the request attribute
explicit.
2018-01-16 15:49:42 +00:00

134 lines
4.1 KiB
Python

import twisted.python.failure
from twisted.internet import defer
from twisted.internet import reactor
from .. import unittest
from synapse.util.async import sleep
from synapse.util import logcontext
from synapse.util.logcontext import LoggingContext
class LoggingContextTestCase(unittest.TestCase):
def _check_test_key(self, value):
self.assertEquals(
LoggingContext.current_context().request, value
)
def test_with_context(self):
with LoggingContext() as context_one:
context_one.request = "test"
self._check_test_key("test")
@defer.inlineCallbacks
def test_sleep(self):
@defer.inlineCallbacks
def competing_callback():
with LoggingContext() as competing_context:
competing_context.request = "competing"
yield sleep(0)
self._check_test_key("competing")
reactor.callLater(0, competing_callback)
with LoggingContext() as context_one:
context_one.request = "one"
yield sleep(0)
self._check_test_key("one")
def _test_preserve_fn(self, function):
sentinel_context = LoggingContext.current_context()
callback_completed = [False]
@defer.inlineCallbacks
def cb():
context_one.request = "one"
yield function()
self._check_test_key("one")
callback_completed[0] = True
with LoggingContext() as context_one:
context_one.request = "one"
# fire off function, but don't wait on it.
logcontext.preserve_fn(cb)()
self._check_test_key("one")
# now wait for the function under test to have run, and check that
# the logcontext is left in a sane state.
d2 = defer.Deferred()
def check_logcontext():
if not callback_completed[0]:
reactor.callLater(0.01, check_logcontext)
return
# make sure that the context was reset before it got thrown back
# into the reactor
try:
self.assertIs(LoggingContext.current_context(),
sentinel_context)
d2.callback(None)
except BaseException:
d2.errback(twisted.python.failure.Failure())
reactor.callLater(0.01, check_logcontext)
# test is done once d2 finishes
return d2
def test_preserve_fn_with_blocking_fn(self):
@defer.inlineCallbacks
def blocking_function():
yield sleep(0)
return self._test_preserve_fn(blocking_function)
def test_preserve_fn_with_non_blocking_fn(self):
@defer.inlineCallbacks
def nonblocking_function():
with logcontext.PreserveLoggingContext():
yield defer.succeed(None)
return self._test_preserve_fn(nonblocking_function)
@defer.inlineCallbacks
def test_make_deferred_yieldable(self):
# a function which retuns an incomplete deferred, but doesn't follow
# the synapse rules.
def blocking_function():
d = defer.Deferred()
reactor.callLater(0, d.callback, None)
return d
sentinel_context = LoggingContext.current_context()
with LoggingContext() as context_one:
context_one.request = "one"
d1 = logcontext.make_deferred_yieldable(blocking_function())
# make sure that the context was reset by make_deferred_yieldable
self.assertIs(LoggingContext.current_context(), sentinel_context)
yield d1
# now it should be restored
self._check_test_key("one")
@defer.inlineCallbacks
def test_make_deferred_yieldable_on_non_deferred(self):
"""Check that make_deferred_yieldable does the right thing when its
argument isn't actually a deferred"""
with LoggingContext() as context_one:
context_one.request = "one"
d1 = logcontext.make_deferred_yieldable("bum")
self._check_test_key("one")
r = yield d1
self.assertEqual(r, "bum")
self._check_test_key("one")