Merge 3.4: Issue #21119, fix ResourceWarning in asyncio

* Make sure that socketpair() close sockets on error. Close the listening
  socket if sock.bind() raises an exception.
* asyncio now closes sockets on errors. Fix ResourceWarning:
  create_connection(), create_datagram_endpoint() and create_unix_server()
  methods of event loop now close the newly created socket on error.

3 files changed, 48 insertions, 0 deletions

diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 4ba9556..dbcd590 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -583,6 +583,27 @@ class BaseEventLoopWithSelectorTests(unittest.TestCase):
 
         self.assertEqual(str(cm.exception), 'Multiple exceptions: err1, err2')
 
+    @mock.patch('asyncio.base_events.socket')
+    def test_create_connection_timeout(self, m_socket):
+        # Ensure that the socket is closed on timeout
+        sock = mock.Mock()
+        m_socket.socket.return_value = sock
+
+        def getaddrinfo(*args, **kw):
+            fut = asyncio.Future(loop=self.loop)
+            addr = (socket.AF_INET, socket.SOCK_STREAM, 0, '',
+                    ('127.0.0.1', 80))
+            fut.set_result([addr])
+            return fut
+        self.loop.getaddrinfo = getaddrinfo
+
+        with mock.patch.object(self.loop, 'sock_connect',
+                               side_effect=asyncio.TimeoutError):
+            coro = self.loop.create_connection(MyProto, '127.0.0.1', 80)
+            with self.assertRaises(asyncio.TimeoutError) as cm:
+                self.loop.run_until_complete(coro)
+            self.assertTrue(sock.close.called)
+
     def test_create_connection_host_port_sock(self):
         coro = self.loop.create_connection(
             MyProto, 'example.com', 80, sock=object())
diff --git a/Lib/test/test_asyncio/test_unix_events.py b/Lib/test/test_asyncio/test_unix_events.py
index 744c319..cec7a11 100644
--- a/Lib/test/test_asyncio/test_unix_events.py
+++ b/Lib/test/test_asyncio/test_unix_events.py
@@ -256,6 +256,24 @@ class SelectorEventLoopUnixSocketTests(unittest.TestCase):
                                         'A UNIX Domain Socket was expected'):
                 self.loop.run_until_complete(coro)
 
+    @mock.patch('asyncio.unix_events.socket')
+    def test_create_unix_server_bind_error(self, m_socket):
+        # Ensure that the socket is closed on any bind error
+        sock = mock.Mock()
+        m_socket.socket.return_value = sock
+
+        sock.bind.side_effect = OSError
+        coro = self.loop.create_unix_server(lambda: None, path="/test")
+        with self.assertRaises(OSError):
+            self.loop.run_until_complete(coro)
+        self.assertTrue(sock.close.called)
+
+        sock.bind.side_effect = MemoryError
+        coro = self.loop.create_unix_server(lambda: None, path="/test")
+        with self.assertRaises(MemoryError):
+            self.loop.run_until_complete(coro)
+        self.assertTrue(sock.close.called)
+
     def test_create_unix_connection_path_sock(self):
         coro = self.loop.create_unix_connection(
             lambda: None, '/dev/null', sock=object())
diff --git a/Lib/test/test_asyncio/test_windows_utils.py b/Lib/test/test_asyncio/test_windows_utils.py
index 9daf434..b1f81da 100644
--- a/Lib/test/test_asyncio/test_windows_utils.py
+++ b/Lib/test/test_asyncio/test_windows_utils.py
@@ -51,6 +51,15 @@ class WinsocketpairTests(unittest.TestCase):
         self.assertRaises(ValueError,
                           windows_utils.socketpair, proto=1)
 
+    @mock.patch('asyncio.windows_utils.socket')
+    def test_winsocketpair_close(self, m_socket):
+        m_socket.AF_INET = socket.AF_INET
+        m_socket.SOCK_STREAM = socket.SOCK_STREAM
+        sock = mock.Mock()
+        m_socket.socket.return_value = sock
+        sock.bind.side_effect = OSError
+        self.assertRaises(OSError, windows_utils.socketpair)
+        self.assertTrue(sock.close.called)
 
 
 class PipeTests(unittest.TestCase):