Python twisted.internet.defer.AlreadyCalledError() Examples

def test_cancelQueueAfterGet(self):
        """
        When canceling a L{Deferred} from a L{DeferredQueue} that does not
        have a result (i.e., the L{Deferred} has not fired), the cancel
        causes a L{defer.CancelledError} failure. If the queue has a result
        later on, it doesn't try to fire the deferred.
        """
        queue = defer.DeferredQueue()
        d = queue.get()
        self.assertFailure(d, defer.CancelledError)
        d.cancel()
        def cb(ignore):
            # If the deferred is still linked with the deferred queue, it will
            # fail with an AlreadyCalledError
            queue.put(None)
            return queue.get().addCallback(self.assertIdentical, None)
        return d.addCallback(cb) 

def _fail(self, error):
        """
        Errback all queued deferreds.
        """
        if self._failed:
            # We're recursing; bail out here for simplicity
            return error
        self._failed = 1
        if self.nextDeferred:
            try:
                self.nextDeferred.errback(failure.Failure(ConnectionLost('FTP connection lost', error)))
            except defer.AlreadyCalledError:
                pass
        for ftpCommand in self.actionQueue:
            ftpCommand.fail(failure.Failure(ConnectionLost('FTP connection lost', error)))
        return error 

def test_cancelQueueAfterGet(self):
        """
        When canceling a L{Deferred} from a L{DeferredQueue} that does not
        have a result (i.e., the L{Deferred} has not fired), the cancel
        causes a L{defer.CancelledError} failure. If the queue has a result
        later on, it doesn't try to fire the deferred.
        """
        queue = defer.DeferredQueue()
        d = queue.get()
        d.cancel()
        self.assertImmediateFailure(d, defer.CancelledError)
        def cb(ignore):
            # If the deferred is still linked with the deferred queue, it will
            # fail with an AlreadyCalledError
            queue.put(None)
            return queue.get().addCallback(self.assertIs, None)
        d.addCallback(cb)
        done = []
        d.addCallback(done.append)
        self.assertEqual(len(done), 1) 

def test_simpleCanceller(self):
        """
        Verify that a L{defer.Deferred} calls its specified canceller when
        it is cancelled, and that further call/errbacks raise
        L{defer.AlreadyCalledError}.
        """
        def cancel(d):
            self.cancellerCallCount += 1

        d = defer.Deferred(canceller=cancel)
        d.addCallbacks(self._callback, self._errback)
        d.cancel()
        self.assertEqual(self.cancellerCallCount, 1)
        self.assertEqual(self.errbackResults.type, defer.CancelledError)

        # Test that further call/errbacks are *not* swallowed
        self.assertRaises(defer.AlreadyCalledError, d.callback, None)
        self.assertRaises(defer.AlreadyCalledError, d.errback, Exception()) 

def test_raisesAfterCancelAndErrback(self):
        """
        A L{defer.Deferred} without a canceller, when cancelled must allow
        a single extra call to errback, and raise
        L{defer.AlreadyCalledError} if callbacked or errbacked thereafter.
        """
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        d.cancel()

        # A single extra errback should be swallowed.
        d.errback(Exception())

        # But a second call to callback or errback is not.
        self.assertRaises(defer.AlreadyCalledError, d.callback, None)
        self.assertRaises(defer.AlreadyCalledError, d.errback, Exception()) 

def _fail(self, error):
        """
        Errback all queued deferreds.
        """
        if self._failed:
            # We're recursing; bail out here for simplicity
            return error
        self._failed = 1
        if self.nextDeferred:
            try:
                self.nextDeferred.errback(failure.Failure(ConnectionLost('FTP connection lost', error)))
            except defer.AlreadyCalledError:
                pass
        for ftpCommand in self.actionQueue:
            ftpCommand.fail(failure.Failure(ConnectionLost('FTP connection lost', error)))
        return error 

def test_raisesAfterCancelAndErrback(self):
        """
        A L{defer.Deferred} without a canceller, when cancelled must allow
        a single extra call to errback, and raise
        L{defer.AlreadyCalledError} if callbacked or errbacked thereafter.
        """
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        d.cancel()

        # A single extra errback should be swallowed.
        d.errback(Exception())

        # But a second call to callback or errback is not.
        self.assertRaises(defer.AlreadyCalledError, d.callback, None)
        self.assertRaises(defer.AlreadyCalledError, d.errback, Exception()) 

def test_simpleCanceller(self):
        """
        Verify that a L{defer.Deferred} calls its specified canceller when
        it is cancelled, and that further call/errbacks raise
        L{defer.AlreadyCalledError}.
        """
        def cancel(d):
            self.cancellerCallCount += 1

        d = defer.Deferred(canceller=cancel)
        d.addCallbacks(self._callback, self._errback)
        d.cancel()
        self.assertEquals(self.cancellerCallCount, 1)
        self.assertEquals(self.errbackResults.type, defer.CancelledError)

        # Test that further call/errbacks are *not* swallowed
        self.assertRaises(defer.AlreadyCalledError, d.callback, None)
        self.assertRaises(defer.AlreadyCalledError, d.errback, Exception()) 

def test_cancelQueueAfterGet(self):
        """
        When canceling a L{Deferred} from a L{DeferredQueue} that does not
        have a result (i.e., the L{Deferred} has not fired), the cancel
        causes a L{defer.CancelledError} failure. If the queue has a result
        later on, it doesn't try to fire the deferred.
        """
        queue = defer.DeferredQueue()
        d = queue.get()
        d.cancel()
        self.assertImmediateFailure(d, defer.CancelledError)
        def cb(ignore):
            # If the deferred is still linked with the deferred queue, it will
            # fail with an AlreadyCalledError
            queue.put(None)
            return queue.get().addCallback(self.assertIs, None)
        d.addCallback(cb)
        done = []
        d.addCallback(done.append)
        self.assertEqual(len(done), 1) 

def test_simpleCanceller(self):
        """
        Verify that a L{defer.Deferred} calls its specified canceller when
        it is cancelled, and that further call/errbacks raise
        L{defer.AlreadyCalledError}.
        """
        def cancel(d):
            self.cancellerCallCount += 1

        d = defer.Deferred(canceller=cancel)
        d.addCallbacks(self._callback, self._errback)
        d.cancel()
        self.assertEqual(self.cancellerCallCount, 1)
        self.assertEqual(self.errbackResults.type, defer.CancelledError)

        # Test that further call/errbacks are *not* swallowed
        self.assertRaises(defer.AlreadyCalledError, d.callback, None)
        self.assertRaises(defer.AlreadyCalledError, d.errback, Exception()) 

def test_raisesAfterCancelAndErrback(self):
        """
        A L{defer.Deferred} without a canceller, when cancelled must allow
        a single extra call to errback, and raise
        L{defer.AlreadyCalledError} if callbacked or errbacked thereafter.
        """
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        d.cancel()

        # A single extra errback should be swallowed.
        d.errback(Exception())

        # But a second call to callback or errback is not.
        self.assertRaises(defer.AlreadyCalledError, d.callback, None)
        self.assertRaises(defer.AlreadyCalledError, d.errback, Exception()) 

def maybe_download_services_config(self, ignored):
        # TODO --- currently, some providers (mail.bitmask.net) raise 401
        # UNAUTHENTICATED if we try to get the services
        # See: # https://leap.se/code/issues/7906

        def first_bootstrap_done(ignored):
            try:
                self.first_bootstrap.callback('got config')
            except defer.AlreadyCalledError:
                pass

        uri, met, path = self._get_configs_download_params()
        d = httpRequest(
            self._http._agent, uri, method=met, saveto=path)
        d.addCallback(lambda _: self._load_provider_json())
        d.addCallback(
            lambda _: self._get_config_for_all_services(session=None))
        d.addCallback(first_bootstrap_done)
        d.addErrback(lambda _: 'ok for now')
        return d 

def bootstrap(self, replace_if_newer=False):
        domain = self._domain
        self.log.debug('Bootstrapping provider %s' % domain)

        def first_bootstrap_done(ignored):
            if self._allows_anonymous():
                # we continue bootstrapping, we do not
                # need to wait for authentication.
                return
            try:
                self.first_bootstrap.callback('got config')
            except defer.AlreadyCalledError:
                pass

        def first_bootstrap_error(failure):
            self.first_bootstrap.errback(failure)
            return failure

        d = self.maybe_download_provider_info(replace=replace_if_newer)
        d.addCallback(self.maybe_download_ca_cert, replace_if_newer)
        d.addCallback(self.validate_ca_cert)
        d.addCallbacks(first_bootstrap_done, first_bootstrap_error)
        d.addCallback(self.maybe_download_services_config)
        self.ongoing_bootstrap = d 

def _fail(self, error):
        """
        Errback all queued deferreds.
        """
        if self._failed:
            # We're recursing; bail out here for simplicity
            return error
        self._failed = 1
        if self.nextDeferred:
            try:
                self.nextDeferred.errback(failure.Failure(ConnectionLost('FTP connection lost', error)))
            except defer.AlreadyCalledError:
                pass
        for ftpCommand in self.actionQueue:
            ftpCommand.fail(failure.Failure(ConnectionLost('FTP connection lost', error)))
        return error 

def testAlreadyCalledDebug_EC(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        try:
            self._call_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_EC", "_err_1", "_call_2") 

def testAlreadyCalledDebug_EE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        try:
            self._err_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_EE", "_err_1", "_err_2") 

def testAlreadyCalled_CC(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        self.failUnlessRaises(defer.AlreadyCalledError, self._call_2, d) 

def testAlreadyCalled_CE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        self.failUnlessRaises(defer.AlreadyCalledError, self._err_2, d) 

def testAlreadyCalled_EE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        self.failUnlessRaises(defer.AlreadyCalledError, self._err_2, d) 

def testAlreadyCalledDebug_CC(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        try:
            self._call_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_CC", "_call_1", "_call_2") 

def testAlreadyCalledDebug_CE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        try:
            self._err_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_CE", "_call_1", "_err_2") 

def _run(self, methodName, result):
        from twisted.internet import reactor
        timeout = self.getTimeout()
        def onTimeout(d):
            e = defer.TimeoutError("%r (%s) still running at %s secs"
                % (self, methodName, timeout))
            f = failure.Failure(e)
            # try to errback the deferred that the test returns (for no gorram
            # reason) (see issue1005 and test_errorPropagation in test_deferred)
            try:
                d.errback(f)
            except defer.AlreadyCalledError:
                # if the deferred has been called already but the *back chain is
                # still unfinished, crash the reactor and report timeout error
                # ourself.
                reactor.crash()
                self._timedOut = True # see self._wait
                todo = self.getTodo()
                if todo is not None and todo.expected(f):
                    result.addExpectedFailure(self, f, todo)
                else:
                    result.addError(self, f)
        if self._shared:
            test = self.__class__._testCaseInstance
        else:
            test = self
        method = getattr(test, methodName)
        d = defer.maybeDeferred(utils.runWithWarningsSuppressed,
                                self.getSuppress(), method)
        call = reactor.callLater(timeout, onTimeout, d)
        d.addBoth(lambda x : call.active() and call.cancel() or x)
        return d 

def testAlreadyCalledDebug_EE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        try:
            self._err_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_EE", "_err_1", "_err_2") 

def testNoDebugging(self):
        defer.setDebugging(False)
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        try:
            self._call_2(d)
        except defer.AlreadyCalledError, e:
            self.failIf(e.args) 

def testAlreadyCalledDebug_EC(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        try:
            self._call_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_EC", "_err_1", "_call_2") 

def testAlreadyCalledDebug_CE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        try:
            self._err_2(d)
        except defer.AlreadyCalledError, e:
            self._check(e, "testAlreadyCalledDebug_CE", "_call_1", "_err_2") 

def testAlreadyCalled_EC(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        self.failUnlessRaises(defer.AlreadyCalledError, self._call_2, d) 

def testNoDebugging(self):
        defer.setDebugging(False)
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        try:
            self._call_2(d)
        except defer.AlreadyCalledError, e:
            self.failIf(e.args) 

def testAlreadyCalled_EE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._err_1(d)
        self.failUnlessRaises(defer.AlreadyCalledError, self._err_2, d) 

def testAlreadyCalled_CE(self):
        d = defer.Deferred()
        d.addCallbacks(self._callback, self._errback)
        self._call_1(d)
        self.failUnlessRaises(defer.AlreadyCalledError, self._err_2, d)