def test_startLoggingOverridesWarning(self):
"""
startLogging() overrides global C{warnings.showwarning} such that
warnings go to Twisted log observers.
"""
self._startLoggingCleanup()
newPublisher = NewLogPublisher()
class SysModule(object):
stdout = object()
stderr = object()
tempLogPublisher = LogPublisher(
newPublisher, newPublisher,
logBeginner=LogBeginner(newPublisher, StringIO(), SysModule,
warnings)
)
# Trial reports warnings in two ways. First, it intercepts the global
# 'showwarning' function *itself*, after starting logging (by way of
# the '_collectWarnings' function which collects all warnings as a
# around the test's 'run' method). Second, it has a log observer which
# immediately reports warnings when they're propagated into the log
# system (which, in normal operation, happens only at the end of the
# test case). In order to avoid printing a spurious warning in this
# test, we first replace the global log publisher's 'showwarning' in
# the module with our own.
self.patch(log, "theLogPublisher", tempLogPublisher)
# And, one last thing, pretend we're starting from a fresh import, or
# warnings.warn won't be patched at all.
log._oldshowwarning = None
# Global mutable state is bad, kids. Stay in school.
fakeFile = StringIO()
# We didn't previously save log messages, so let's make sure we don't
# save them any more.
evt = {"pre-start": "event"}
received = []
def preStartObserver(x):
if 'pre-start' in x.keys():
received.append(x)
newPublisher(evt)
newPublisher.addObserver(preStartObserver)
log.startLogging(fakeFile, setStdout=False)
self.addCleanup(tempLogPublisher._stopLogging)
self.assertEqual(received, [])
warnings.warn("hello!")
output = fakeFile.getvalue()
self.assertIn("UserWarning: hello!", output)
def __init__(self, observerPublisher=None, publishPublisher=None,
logBeginner=None, warningsModule=warnings):
if publishPublisher is None:
publishPublisher = NewPublisher()
if observerPublisher is None:
observerPublisher = publishPublisher
if observerPublisher is None:
observerPublisher = NewPublisher()
self._observerPublisher = observerPublisher
self._publishPublisher = publishPublisher
self._legacyObservers = []
if logBeginner is None:
# This default behavior is really only used for testing.
beginnerPublisher = NewPublisher()
beginnerPublisher.addObserver(observerPublisher)
logBeginner = LogBeginner(beginnerPublisher, NullFile(), sys,
warnings)
self._logBeginner = logBeginner
self._warningsModule = warningsModule
self._oldshowwarning = warningsModule.showwarning
self.showwarning = self._logBeginner.showwarning
def test_old_style(self):
"""
L{Logger} handles old style log strings.
"""
observer = LogPublisher()
observed = []
observer.addObserver(observed.append)
sio = StringIO()
observer.addObserver(textFileLogObserver(sio))
logger = Logger(observer=observer)
index = 0
logger.info("test")
self.assertEqual(observed[index]["log_level"], LogLevel.info)
self.assertEqual(observed[index]["log_format"], u"{msg}")
self.assertEqual(observed[index]["msg"], u"test")
self.assertEqual(
sio.getvalue().splitlines()[index].split("#info] ")[1], "test")
index += 1
logger.info("test {}")
self.assertEqual(observed[index]["log_level"], LogLevel.info)
self.assertEqual(observed[index]["log_format"], u"{msg}")
self.assertEqual(observed[index]["msg"], u"test {}")
self.assertEqual(
sio.getvalue().splitlines()[index].split("#info] ")[1], "test {}")
index += 1
logger.info("test {foo}")
self.assertEqual(observed[index]["log_level"], LogLevel.info)
self.assertEqual(observed[index]["log_format"], u"{msg}")
self.assertEqual(observed[index]["msg"], u"test {foo}")
self.assertEqual(
sio.getvalue().splitlines()[index].split("#info] ")[1],
"test {foo}")
def __init__(self,
observerPublisher=None,
publishPublisher=None,
logBeginner=None,
warningsModule=warnings):
if publishPublisher is None:
publishPublisher = NewPublisher()
if observerPublisher is None:
observerPublisher = publishPublisher
if observerPublisher is None:
observerPublisher = NewPublisher()
self._observerPublisher = observerPublisher
self._publishPublisher = publishPublisher
self._legacyObservers = []
if logBeginner is None:
# This default behavior is really only used for testing.
beginnerPublisher = NewPublisher()
beginnerPublisher.addObserver(observerPublisher)
logBeginner = LogBeginner(beginnerPublisher, NullFile(), sys,
warnings)
self._logBeginner = logBeginner
self._warningsModule = warningsModule
self._oldshowwarning = warningsModule.showwarning
self.showwarning = self._logBeginner.showwarning