[Python-checkins] cpython (3.4): Issue #11453: asyncore: emit a ResourceWarning when an unclosed file_wrapper

[victor.stinner]

http://hg.python.org/cpython/rev/ae12a926e680
changeset:   91450:ae12a926e680
branch:      3.4
parent:      91448:c2dba8ee4e96
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Fri Jun 27 23:52:03 2014 +0200
summary:
  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.

files:
  Lib/asyncore.py           |   8 ++++++++
  Lib/test/test_asyncore.py |  16 ++++++++++++++++
  Misc/NEWS                 |   4 ++++
  3 files changed, 28 insertions(+), 0 deletions(-)


diff --git a/Lib/asyncore.py b/Lib/asyncore.py
--- a/Lib/asyncore.py
+++ b/Lib/asyncore.py
@@ -614,6 +614,11 @@
         def __init__(self, fd):
             self.fd = os.dup(fd)
 
+        def __del__(self):
+            if self.fd >= 0:
+                warnings.warn("unclosed file %r" % self, ResourceWarning)
+            self.close()
+
         def recv(self, *args):
             return os.read(self.fd, *args)
 
@@ -632,7 +637,10 @@
         write = send
 
         def close(self):
+            if self.fd < 0:
+                return
             os.close(self.fd)
+            self.fd = -1
 
         def fileno(self):
             return self.fd
diff --git a/Lib/test/test_asyncore.py b/Lib/test/test_asyncore.py
--- a/Lib/test/test_asyncore.py
+++ b/Lib/test/test_asyncore.py
@@ -436,6 +436,22 @@
         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):
 
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -27,6 +27,10 @@
 Library
 -------
 
+- 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.
+
 - Issue #21858: Better handling of Python exceptions in the sqlite3 module.
 
 - Issue #21476: Make sure the email.parser.BytesParser TextIOWrapper is

-- 
Repository URL: http://hg.python.org/cpython