bpo-29742: asyncio get_extra_info() throws exception (#525)

Lib/asyncio/sslproto.py

@@ -543,8 +543,10 @@ def eof_received(self):
     def _get_extra_info(self, name, default=None):
         if name in self._extra:
             return self._extra[name]
-        else:
+        elif self._transport is not None:
             return self._transport.get_extra_info(name, default)
+        else:
+            return default
 
     def _start_shutdown(self):
         if self._in_shutdown:

Lib/test/test_asyncio/test_sslproto.py

@@ -95,5 +95,17 @@ def test_connection_lost(self):
         test_utils.run_briefly(self.loop)
         self.assertIsInstance(waiter.exception(), ConnectionAbortedError)
 
+    def test_get_extra_info_on_closed_connection(self):
+        waiter = asyncio.Future(loop=self.loop)
+        ssl_proto = self.ssl_protocol(waiter)
+        self.assertIsNone(ssl_proto._get_extra_info('socket'))
+        default = object()
+        self.assertIs(ssl_proto._get_extra_info('socket', default), default)
+        self.connection_made(ssl_proto)
+        self.assertIsNotNone(ssl_proto._get_extra_info('socket'))
+        ssl_proto.connection_lost(None)
+        self.assertIsNone(ssl_proto._get_extra_info('socket'))
+
+
 if __name__ == '__main__':
     unittest.main()

Misc/NEWS

@@ -335,6 +335,9 @@ Library
 - bpo-28518: Start a transaction implicitly before a DML statement.
   Patch by Aviv Palivoda.
 
+- bpo-29742: get_extra_info() raises exception if get called on closed ssl transport.
+  Patch by Nikolay Kim.
+
 - Issue #16285: urrlib.parse.quote is now based on RFC 3986 and hence includes
   '~' in the set of characters that is not quoted by default. Patch by
   Christian Theune and Ratnadeep Debnath.