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""" Tests for L{twisted.internet.defer.deferredGenerator} and related APIs. """ from __future__ import division, absolute_import from twisted.internet import reactor from twisted.trial import unittest from twisted.internet.defer import waitForDeferred, deferredGenerator, Deferred from twisted.internet.defer import inlineCallbacks, returnValue from twisted.internet import defer from twisted.trial.util import suppress as SUPPRESS from twisted.python.util import runWithWarningsSuppressed def getThing(): d = Deferred() reactor.callLater(0, d.callback, "hi") return d def getOwie(): d = Deferred() def CRAP(): d.errback(ZeroDivisionError('OMG')) reactor.callLater(0, CRAP) return d # NOTE: most of the tests in DeferredGeneratorTests are duplicated # with slightly different syntax for the InlineCallbacksTests below. class TerminalException(Exception): pass class BaseDefgenTests: """ This class sets up a bunch of test cases which will test both deferredGenerator and inlineCallbacks based generators. The subclasses DeferredGeneratorTests and InlineCallbacksTests each provide the actual generator implementations tested. """ def testBasics(self): """ Test that a normal deferredGenerator works. Tests yielding a deferred which callbacks, as well as a deferred errbacks. Also ensures returning a final value works. """ return self._genBasics().addCallback(self.assertEqual, 'WOOSH') def testBuggy(self): """ Ensure that a buggy generator properly signals a Failure condition on result deferred. """ return self.assertFailure(self._genBuggy(), ZeroDivisionError) def testNothing(self): """Test that a generator which never yields results in None.""" return self._genNothing().addCallback(self.assertEqual, None) def testHandledTerminalFailure(self): """ Create a Deferred Generator which yields a Deferred which fails and handles the exception which results. Assert that the Deferred Generator does not errback its Deferred. """ return self._genHandledTerminalFailure().addCallback(self.assertEqual, None) def testHandledTerminalAsyncFailure(self): """ Just like testHandledTerminalFailure, only with a Deferred which fires asynchronously with an error. """ d = defer.Deferred() deferredGeneratorResultDeferred = self._genHandledTerminalAsyncFailure(d) d.errback(TerminalException("Handled Terminal Failure")) return deferredGeneratorResultDeferred.addCallback( self.assertEqual, None) def testStackUsage(self): """ Make sure we don't blow the stack when yielding immediately available deferreds. """ return self._genStackUsage().addCallback(self.assertEqual, 0) def testStackUsage2(self): """ Make sure we don't blow the stack when yielding immediately available values. """ return self._genStackUsage2().addCallback(self.assertEqual, 0) def deprecatedDeferredGenerator(f): """ Calls L{deferredGenerator} while suppressing the deprecation warning. @param f: Function to call @return: Return value of function. """ return runWithWarningsSuppressed( [ SUPPRESS(message="twisted.internet.defer.deferredGenerator was " "deprecated") ], deferredGenerator, f) class DeferredGeneratorTests(BaseDefgenTests, unittest.TestCase): # First provide all the generator impls necessary for BaseDefgenTests @deprecatedDeferredGenerator def _genBasics(self): x = waitForDeferred(getThing()) yield x x = x.getResult() self.assertEqual(x, "hi") ow = waitForDeferred(getOwie()) yield ow try: ow.getResult() except ZeroDivisionError as e: self.assertEqual(str(e), 'OMG') yield "WOOSH" return @deprecatedDeferredGenerator def _genBuggy(self): yield waitForDeferred(getThing()) 1//0 @deprecatedDeferredGenerator def _genNothing(self): if 0: yield 1 @deprecatedDeferredGenerator def _genHandledTerminalFailure(self): x = waitForDeferred(defer.fail(TerminalException("Handled Terminal Failure"))) yield x try: x.getResult() except TerminalException: pass @deprecatedDeferredGenerator def _genHandledTerminalAsyncFailure(self, d): x = waitForDeferred(d) yield x try: x.getResult() except TerminalException: pass def _genStackUsage(self): for x in range(5000): # Test with yielding a deferred x = waitForDeferred(defer.succeed(1)) yield x x = x.getResult() yield 0 _genStackUsage = deprecatedDeferredGenerator(_genStackUsage) def _genStackUsage2(self): for x in range(5000): # Test with yielding a random value yield 1 yield 0 _genStackUsage2 = deprecatedDeferredGenerator(_genStackUsage2) # Tests unique to deferredGenerator def testDeferredYielding(self): """ Ensure that yielding a Deferred directly is trapped as an error. """ # See the comment _deferGenerator about d.callback(Deferred). def _genDeferred(): yield getThing() _genDeferred = deprecatedDeferredGenerator(_genDeferred) return self.assertFailure(_genDeferred(), TypeError) suppress = [ SUPPRESS(message='twisted.internet.defer.waitForDeferred was ' 'deprecated') ] class InlineCallbacksTests(BaseDefgenTests, unittest.TestCase): # First provide all the generator impls necessary for BaseDefgenTests def _genBasics(self): x = yield getThing() self.assertEqual(x, "hi") try: yield getOwie() except ZeroDivisionError as e: self.assertEqual(str(e), 'OMG') returnValue("WOOSH") _genBasics = inlineCallbacks(_genBasics) def _genBuggy(self): yield getThing() 1/0 _genBuggy = inlineCallbacks(_genBuggy) def _genNothing(self): if 0: yield 1 _genNothing = inlineCallbacks(_genNothing) def _genHandledTerminalFailure(self): try: yield defer.fail(TerminalException("Handled Terminal Failure")) except TerminalException: pass _genHandledTerminalFailure = inlineCallbacks(_genHandledTerminalFailure) def _genHandledTerminalAsyncFailure(self, d): try: yield d except TerminalException: pass _genHandledTerminalAsyncFailure = inlineCallbacks( _genHandledTerminalAsyncFailure) def _genStackUsage(self): for x in range(5000): # Test with yielding a deferred yield defer.succeed(1) returnValue(0) _genStackUsage = inlineCallbacks(_genStackUsage) def _genStackUsage2(self): for x in range(5000): # Test with yielding a random value yield 1 returnValue(0) _genStackUsage2 = inlineCallbacks(_genStackUsage2) # Tests unique to inlineCallbacks def testYieldNonDeferred(self): """ Ensure that yielding a non-deferred passes it back as the result of the yield expression. @return: A L{twisted.internet.defer.Deferred} @rtype: L{twisted.internet.defer.Deferred} """ def _test(): yield 5 returnValue(5) _test = inlineCallbacks(_test) return _test().addCallback(self.assertEqual, 5) def testReturnNoValue(self): """Ensure a standard python return results in a None result.""" def _noReturn(): yield 5 return _noReturn = inlineCallbacks(_noReturn) return _noReturn().addCallback(self.assertEqual, None) def testReturnValue(self): """Ensure that returnValue works.""" def _return(): yield 5 returnValue(6) _return = inlineCallbacks(_return) return _return().addCallback(self.assertEqual, 6) def test_nonGeneratorReturn(self): """ Ensure that C{TypeError} with a message about L{inlineCallbacks} is raised when a non-generator returns something other than a generator. """ def _noYield(): return 5 _noYield = inlineCallbacks(_noYield) self.assertIn("inlineCallbacks", str(self.assertRaises(TypeError, _noYield))) def test_nonGeneratorReturnValue(self): """ Ensure that C{TypeError} with a message about L{inlineCallbacks} is raised when a non-generator calls L{returnValue}. """ def _noYield(): returnValue(5) _noYield = inlineCallbacks(_noYield) self.assertIn("inlineCallbacks", str(self.assertRaises(TypeError, _noYield))) class DeprecateDeferredGeneratorTests(unittest.SynchronousTestCase): """ Tests that L{DeferredGeneratorTests} and L{waitForDeferred} are deprecated. """ def test_deferredGeneratorDeprecated(self): """ L{deferredGenerator} is deprecated. """ @deferredGenerator def decoratedFunction(): yield None warnings = self.flushWarnings([self.test_deferredGeneratorDeprecated]) self.assertEqual(len(warnings), 1) self.assertEqual(warnings[0]['category'], DeprecationWarning) self.assertEqual( warnings[0]['message'], "twisted.internet.defer.deferredGenerator was deprecated in " "Twisted 15.0.0; please use " "twisted.internet.defer.inlineCallbacks instead") def test_waitForDeferredDeprecated(self): """ L{waitForDeferred} is deprecated. """ d = Deferred() waitForDeferred(d) warnings = self.flushWarnings([self.test_waitForDeferredDeprecated]) self.assertEqual(len(warnings), 1) self.assertEqual(warnings[0]['category'], DeprecationWarning) self.assertEqual( warnings[0]['message'], "twisted.internet.defer.waitForDeferred was deprecated in " "Twisted 15.0.0; please use " "twisted.internet.defer.inlineCallbacks instead")