Reduce the number of stat/fstat system calls made

This address BZ 868086, https://bugzilla.redhat.com/show_bug.cgi?id=868086

This refactoring consolidates the code a bit, and uses os.stat calls to get
all the information in one call when gathering the metadata for an object. The
five stat system calls (invoked via all the os.path.*() calls) have been
reduced to one.

We also added a unit test for the one new behavior where get_object_metadata()
will now throw an OSError exception if it has a problem stat'ing a file that
exists.

Change-Id: Iad5410c77938af68a47be757a3170abd201adeb0
BUG: 868086
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Reviewed-on: http://review.gluster.org/4112
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Mohammed Junaid <junaid@redhat.com>
Tested-by: Anand Avati <avati@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/swift/1.4.8/test/unit/plugins/test_utils.py b/swift/1.4.8/test/unit/plugins/test_utils.py
index 944d118..70081a7 100644
--- a/swift/1.4.8/test/unit/plugins/test_utils.py
+++ b/swift/1.4.8/test/unit/plugins/test_utils.py
@@ -312,6 +312,15 @@ class TestUtils(unittest.TestCase):
         md = utils.get_object_metadata("/tmp/doesNotEx1st")
         assert md == {}
 
+    def test_get_object_metadata_err(self):
+        tf = tempfile.NamedTemporaryFile()
+        try:
+            md = utils.get_object_metadata(os.path.join(tf.name,"doesNotEx1st"))
+        except OSError as e:
+            assert e.errno != errno.ENOENT
+        else:
+            self.fail("Expected exception")
+
     obj_keys = (utils.X_TIMESTAMP, utils.X_CONTENT_TYPE, utils.X_ETAG,
                 utils.X_CONTENT_LENGTH, utils.X_TYPE, utils.X_OBJECT_TYPE)