[Python-checkins] bpo-29183: Fix double exceptions in wsgiref.handlers.BaseHandler (GH-12914)
Berker Peksag
webhook-mailer at python.org
Sun May 19 11:56:31 EDT 2019
https://github.com/python/cpython/commit/7c59362a15dfce538512ff1fce4e07d33a925cfb
commit: 7c59362a15dfce538512ff1fce4e07d33a925cfb
branch: master
author: Berker Peksag <berker.peksag at gmail.com>
committer: GitHub <noreply at github.com>
date: 2019-05-19T18:56:15+03:00
summary:
bpo-29183: Fix double exceptions in wsgiref.handlers.BaseHandler (GH-12914)
files:
A Misc/NEWS.d/next/Library/2019-04-22-22-55-29.bpo-29183.MILvsk.rst
M Lib/test/test_wsgiref.py
M Lib/wsgiref/handlers.py
diff --git a/Lib/test/test_wsgiref.py b/Lib/test/test_wsgiref.py
index 46f88a94434b..42432bfbd260 100644
--- a/Lib/test/test_wsgiref.py
+++ b/Lib/test/test_wsgiref.py
@@ -806,6 +806,31 @@ def write(self, b):
self.assertFalse(stderr.getvalue())
+ def testDontResetInternalStateOnException(self):
+ class CustomException(ValueError):
+ pass
+
+ # We are raising CustomException here to trigger an exception
+ # during the execution of SimpleHandler.finish_response(), so
+ # we can easily test that the internal state of the handler is
+ # preserved in case of an exception.
+ class AbortingWriter:
+ def write(self, b):
+ raise CustomException
+
+ stderr = StringIO()
+ environ = {"SERVER_PROTOCOL": "HTTP/1.0"}
+ h = SimpleHandler(BytesIO(), AbortingWriter(), stderr, environ)
+ h.run(hello_app)
+
+ self.assertIn("CustomException", stderr.getvalue())
+
+ # Test that the internal state of the handler is preserved.
+ self.assertIsNotNone(h.result)
+ self.assertIsNotNone(h.headers)
+ self.assertIsNotNone(h.status)
+ self.assertIsNotNone(h.environ)
+
if __name__ == "__main__":
unittest.main()
diff --git a/Lib/wsgiref/handlers.py b/Lib/wsgiref/handlers.py
index 834073d50091..31360e58785a 100644
--- a/Lib/wsgiref/handlers.py
+++ b/Lib/wsgiref/handlers.py
@@ -183,7 +183,16 @@ def finish_response(self):
for data in self.result:
self.write(data)
self.finish_content()
- finally:
+ except:
+ # Call close() on the iterable returned by the WSGI application
+ # in case of an exception.
+ if hasattr(self.result, 'close'):
+ self.result.close()
+ raise
+ else:
+ # We only call close() when no exception is raised, because it
+ # will set status, result, headers, and environ fields to None.
+ # See bpo-29183 for more details.
self.close()
diff --git a/Misc/NEWS.d/next/Library/2019-04-22-22-55-29.bpo-29183.MILvsk.rst b/Misc/NEWS.d/next/Library/2019-04-22-22-55-29.bpo-29183.MILvsk.rst
new file mode 100644
index 000000000000..1d19f191eede
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-04-22-22-55-29.bpo-29183.MILvsk.rst
@@ -0,0 +1,3 @@
+Fix double exceptions in :class:`wsgiref.handlers.BaseHandler` by calling
+its :meth:`~wsgiref.handlers.BaseHandler.close` method only when no
+exception is raised.
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