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| 1 # Copyright (c) 2001-2007 Twisted Matrix Laboratories. | |
| 2 # See LICENSE for details. | |
| 3 | |
| 4 | |
| 5 """ | |
| 6 Python 2.5 test cases for failures thrown into generators. | |
| 7 """ | |
| 8 | |
| 9 import sys | |
| 10 import traceback | |
| 11 | |
| 12 from twisted.trial.unittest import TestCase | |
| 13 | |
| 14 from twisted.python.failure import Failure | |
| 15 from twisted.test.test_failure import getDivisionFailure | |
| 16 from twisted.internet import defer | |
| 17 | |
| 18 | |
| 19 class TwoPointFiveFailureTests(TestCase): | |
| 20 | |
| 21 def test_inlineCallbacksTracebacks(self): | |
| 22 """ | |
| 23 inlineCallbacks that re-raise tracebacks into their deferred | |
| 24 should not lose their tracebacsk. | |
| 25 """ | |
| 26 f = getDivisionFailure() | |
| 27 d = defer.Deferred() | |
| 28 try: | |
| 29 f.raiseException() | |
| 30 except: | |
| 31 d.errback() | |
| 32 | |
| 33 failures = [] | |
| 34 def collect_error(result): | |
| 35 failures.append(result) | |
| 36 | |
| 37 def ic(d): | |
| 38 yield d | |
| 39 ic = defer.inlineCallbacks(ic) | |
| 40 ic(d).addErrback(collect_error) | |
| 41 | |
| 42 newFailure, = failures | |
| 43 self.assertEquals( | |
| 44 traceback.extract_tb(newFailure.getTracebackObject())[-1][-1], | |
| 45 "1/0" | |
| 46 ) | |
| 47 | |
| 48 | |
| 49 def _throwIntoGenerator(self, f, g): | |
| 50 try: | |
| 51 f.throwExceptionIntoGenerator(g) | |
| 52 except StopIteration: | |
| 53 pass | |
| 54 else: | |
| 55 self.fail("throwExceptionIntoGenerator should have raised " | |
| 56 "StopIteration") | |
| 57 | |
| 58 def test_throwExceptionIntoGenerator(self): | |
| 59 """ | |
| 60 It should be possible to throw the exception that a Failure | |
| 61 represents into a generator. | |
| 62 """ | |
| 63 stuff = [] | |
| 64 def generator(): | |
| 65 try: | |
| 66 yield | |
| 67 except: | |
| 68 stuff.append(sys.exc_info()) | |
| 69 else: | |
| 70 self.fail("Yield should have yielded exception.") | |
| 71 g = generator() | |
| 72 f = getDivisionFailure() | |
| 73 g.next() | |
| 74 self._throwIntoGenerator(f, g) | |
| 75 | |
| 76 self.assertEquals(stuff[0][0], ZeroDivisionError) | |
| 77 self.assertTrue(isinstance(stuff[0][1], ZeroDivisionError)) | |
| 78 | |
| 79 self.assertEquals(traceback.extract_tb(stuff[0][2])[-1][-1], "1/0") | |
| 80 | |
| 81 | |
| 82 def test_findFailureInGenerator(self): | |
| 83 """ | |
| 84 Within an exception handler, it should be possible to find the | |
| 85 original Failure that caused the current exception (if it was | |
| 86 caused by throwExceptionIntoGenerator). | |
| 87 """ | |
| 88 f = getDivisionFailure() | |
| 89 f.cleanFailure() | |
| 90 | |
| 91 foundFailures = [] | |
| 92 def generator(): | |
| 93 try: | |
| 94 yield | |
| 95 except: | |
| 96 foundFailures.append(Failure._findFailure()) | |
| 97 else: | |
| 98 self.fail("No exception sent to generator") | |
| 99 | |
| 100 g = generator() | |
| 101 g.next() | |
| 102 self._throwIntoGenerator(f, g) | |
| 103 | |
| 104 self.assertEqual(foundFailures, [f]) | |
| 105 | |
| 106 | |
| 107 def test_failureConstructionFindsOriginalFailure(self): | |
| 108 """ | |
| 109 When a Failure is constructed in the context of an exception | |
| 110 handler that is handling an exception raised by | |
| 111 throwExceptionIntoGenerator, the new Failure should be chained to that | |
| 112 original Failure. | |
| 113 """ | |
| 114 f = getDivisionFailure() | |
| 115 f.cleanFailure() | |
| 116 | |
| 117 newFailures = [] | |
| 118 | |
| 119 def generator(): | |
| 120 try: | |
| 121 yield | |
| 122 except: | |
| 123 newFailures.append(Failure()) | |
| 124 else: | |
| 125 self.fail("No exception sent to generator") | |
| 126 g = generator() | |
| 127 g.next() | |
| 128 self._throwIntoGenerator(f, g) | |
| 129 | |
| 130 self.assertEqual(len(newFailures), 1) | |
| 131 self.assertEqual(newFailures[0].getTraceback(), f.getTraceback()) | |
| 132 | |
| 133 def test_ambiguousFailureInGenerator(self): | |
| 134 """ | |
| 135 When a generator reraises a different exception, | |
| 136 L{Failure._findFailure} inside the generator should find the reraised | |
| 137 exception rather than original one. | |
| 138 """ | |
| 139 def generator(): | |
| 140 try: | |
| 141 try: | |
| 142 yield | |
| 143 except: | |
| 144 [][1] | |
| 145 except: | |
| 146 self.assertIsInstance(Failure().value, IndexError) | |
| 147 g = generator() | |
| 148 g.next() | |
| 149 f = getDivisionFailure() | |
| 150 self._throwIntoGenerator(f, g) | |
| 151 | |
| 152 def test_ambiguousFailureFromGenerator(self): | |
| 153 """ | |
| 154 When a generator reraises a different exception, | |
| 155 L{Failure._findFailure} above the generator should find the reraised | |
| 156 exception rather than original one. | |
| 157 """ | |
| 158 def generator(): | |
| 159 try: | |
| 160 yield | |
| 161 except: | |
| 162 [][1] | |
| 163 g = generator() | |
| 164 g.next() | |
| 165 f = getDivisionFailure() | |
| 166 try: | |
| 167 self._throwIntoGenerator(f, g) | |
| 168 except: | |
| 169 self.assertIsInstance(Failure().value, IndexError) | |
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Chromium Code Reviews
Issue 12261012:
Remove third_party/twisted_8_1 (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/tools/build