Issue #11453: asyncore: emit a ResourceWarning when an unclosed file_wrapper

object is destroyed. The destructor now closes the file if needed. The close()
method can now be called twice: the second call does nothing.

1 files changed, 16 insertions, 0 deletions

diff --git a/Lib/test/test_asyncore.py b/Lib/test/test_asyncore.py
index 7defe65..6cfe580 100644
--- a/Lib/test/test_asyncore.py
+++ b/Lib/test/test_asyncore.py
@@ -436,6 +436,22 @@ class FileWrapperTest(unittest.TestCase):
         asyncore.loop(timeout=0.01, use_poll=True, count=2)
         self.assertEqual(b"".join(data), self.d)
 
+    def test_resource_warning(self):
+        # Issue #11453
+        fd = os.open(support.TESTFN, os.O_RDONLY)
+        f = asyncore.file_wrapper(fd)
+        with support.check_warnings(('', ResourceWarning)):
+            f = None
+            support.gc_collect()
+
+    def test_close_twice(self):
+        fd = os.open(support.TESTFN, os.O_RDONLY)
+        f = asyncore.file_wrapper(fd)
+        f.close()
+        self.assertEqual(f.fd, -1)
+        # calling close twice should not fail
+        f.close()
+
 
 class BaseTestHandler(asyncore.dispatcher):