From 2a2ac73845ffc8695e2bc55746f45e1a18d55e6c Mon Sep 17 00:00:00 2001 From: Lance Stout Date: Fri, 1 Jul 2011 15:15:13 -0700 Subject: [PATCH] So using sys.excepthook to catch errors only works once. The error bubbles through the event processing loop, breaking it and hanging the application. Instead, there is now a .exception(e) method on XMLStream which may be overridden or reassigned that will receive all unhandled exceptions (read: not XMPPError) from event and stream handlers. --- sleekxmpp/stanza/rootstanza.py | 5 +- sleekxmpp/xmlstream/xmlstream.py | 29 +++------ tests/test_stream_exceptions.py | 101 +++++++++++++++++++++++++++++-- tests/test_stream_xep_0030.py | 14 ++--- tests/test_stream_xep_0128.py | 1 - tests/test_stream_xep_0249.py | 1 - 6 files changed, 112 insertions(+), 39 deletions(-) diff --git a/sleekxmpp/stanza/rootstanza.py b/sleekxmpp/stanza/rootstanza.py index bc11476..9e1d1cf 100644 --- a/sleekxmpp/stanza/rootstanza.py +++ b/sleekxmpp/stanza/rootstanza.py @@ -64,8 +64,7 @@ class RootStanza(StanzaBase): # log the error log.exception('Error handling {%s}%s stanza' % (self.namespace, self.name)) - # Finally raise the exception, so it can be handled (or not) - # at a higher level by using sys.excepthook. - raise e + # Finally raise the exception to a global exception handler + self.stream.exception(e) register_stanza_plugin(RootStanza, Error) diff --git a/sleekxmpp/xmlstream/xmlstream.py b/sleekxmpp/xmlstream/xmlstream.py index 6282c8d..c7d0d3a 100644 --- a/sleekxmpp/xmlstream/xmlstream.py +++ b/sleekxmpp/xmlstream/xmlstream.py @@ -764,7 +764,6 @@ class XMLStream(object): Event handlers and the send queue will be threaded regardless of this parameter's value. """ - self._thread_excepthook() self.scheduler.process(threaded=True) def start_thread(name, target): @@ -1052,30 +1051,16 @@ class XMLStream(object): self.event_queue.put(('quit', None, None)) return - def _thread_excepthook(self): + def exception(self, exception): """ - If a threaded event handler raises an exception, there is no way to - catch it except with an excepthook. Currently, each thread has its own - excepthook, but ideally we could use the main sys.excepthook. + Process an unknown exception. - Modifies threading.Thread to use sys.excepthook when an exception - is not caught. + Meant to be overridden. + + Arguments: + exception -- An unhandled exception object. """ - init_old = threading.Thread.__init__ - - def init(self, *args, **kwargs): - init_old(self, *args, **kwargs) - run_old = self.run - - def run_with_except_hook(*args, **kw): - try: - run_old(*args, **kw) - except (KeyboardInterrupt, SystemExit): - raise - except: - sys.excepthook(*sys.exc_info()) - self.run = run_with_except_hook - threading.Thread.__init__ = init + pass # To comply with PEP8, method names now use underscores. diff --git a/tests/test_stream_exceptions.py b/tests/test_stream_exceptions.py index 1143ce2..c41edbb 100644 --- a/tests/test_stream_exceptions.py +++ b/tests/test_stream_exceptions.py @@ -12,7 +12,6 @@ class TestStreamExceptions(SleekTest): """ def tearDown(self): - sys.excepthook = sys.__excepthook__ self.stream_close() def testExceptionReply(self): @@ -23,8 +22,6 @@ class TestStreamExceptions(SleekTest): msg['body'] = 'Body changed' raise XMPPError(clear=False) - - sys.excepthook = lambda *args, **kwargs: None self.stream_start() self.xmpp.add_event_handler('message', message) @@ -44,6 +41,49 @@ class TestStreamExceptions(SleekTest): """) + def testExceptionContinueWorking(self): + """Test that Sleek continues to respond after an XMPPError is raised.""" + + def message(msg): + msg.reply() + msg['body'] = 'Body changed' + raise XMPPError(clear=False) + + self.stream_start() + self.xmpp.add_event_handler('message', message) + + self.recv(""" + + This is going to cause an error. + + """) + + self.send(""" + + This is going to cause an error. + + + + + """) + + self.recv(""" + + This is going to cause an error. + + """) + + self.send(""" + + This is going to cause an error. + + + + + """) + def testXMPPErrorException(self): """Test raising an XMPPError exception.""" @@ -153,9 +193,8 @@ class TestStreamExceptions(SleekTest): def catch_error(*args, **kwargs): raised_errors.append(True) - sys.excepthook = catch_error - self.stream_start() + self.xmpp.exception = catch_error self.xmpp.add_event_handler('message', message) self.recv(""" @@ -178,6 +217,58 @@ class TestStreamExceptions(SleekTest): self.assertEqual(raised_errors, [True], "Exception was not raised: %s" % raised_errors) + def testUnknownException(self): + """Test Sleek continues to respond after an unknown exception.""" + + raised_errors = [] + + def message(msg): + raise ValueError("Did something wrong") + + def catch_error(*args, **kwargs): + raised_errors.append(True) + + self.stream_start() + self.xmpp.exception = catch_error + self.xmpp.add_event_handler('message', message) + + self.recv(""" + + This is going to cause an error. + + """) + + self.send(""" + + + + + SleekXMPP got into trouble. + + + + """) + + self.recv(""" + + This is going to cause an error. + + """) + + self.send(""" + + + + + SleekXMPP got into trouble. + + + + """) + + self.assertEqual(raised_errors, [True, True], "Exceptions were not raised: %s" % raised_errors) suite = unittest.TestLoader().loadTestsFromTestCase(TestStreamExceptions) diff --git a/tests/test_stream_xep_0030.py b/tests/test_stream_xep_0030.py index c960fc7..1666d3a 100644 --- a/tests/test_stream_xep_0030.py +++ b/tests/test_stream_xep_0030.py @@ -12,7 +12,6 @@ class TestStreamDisco(SleekTest): """ def tearDown(self): - sys.excepthook = sys.__excepthook__ self.stream_close() def testInfoEmptyDefaultNode(self): @@ -531,11 +530,6 @@ class TestStreamDisco(SleekTest): raised_exceptions = [] - def catch_exception(*args, **kwargs): - raised_exceptions.append(True) - - sys.excepthook = catch_exception - self.stream_start(mode='client', plugins=['xep_0030', 'xep_0059']) @@ -544,8 +538,14 @@ class TestStreamDisco(SleekTest): iterator=True) results.amount = 10 + def run_test(): + try: + results.next() + except StopIteration: + raised_exceptions.append(True) + t = threading.Thread(name="get_items_iterator", - target=results.next) + target=run_test) t.start() self.send(""" diff --git a/tests/test_stream_xep_0128.py b/tests/test_stream_xep_0128.py index 6fee655..42fc914 100644 --- a/tests/test_stream_xep_0128.py +++ b/tests/test_stream_xep_0128.py @@ -13,7 +13,6 @@ class TestStreamExtendedDisco(SleekTest): """ def tearDown(self): - sys.excepthook = sys.__excepthook__ self.stream_close() def testUsingExtendedInfo(self): diff --git a/tests/test_stream_xep_0249.py b/tests/test_stream_xep_0249.py index f49d1f7..9a25253 100644 --- a/tests/test_stream_xep_0249.py +++ b/tests/test_stream_xep_0249.py @@ -13,7 +13,6 @@ class TestStreamDirectInvite(SleekTest): """ def tearDown(self): - sys.excepthook = sys.__excepthook__ self.stream_close() def testReceiveInvite(self):