Return correct etag for raw manifest

When client sends a '?multipart-manifest=get&format=raw' request
middleware will change the manifest returned from object server.
This patch makes sure the response etag is updated to reflect
changes to manifest content

Change-Id: I0ac6dd0808fb041ba7663f4a472a06ee3f1d9a71

swift/common/middleware/slo.py

@@ -901,7 +901,7 @@ class SloGetContext(WSGIContext):
             seg_dict['size_bytes'] = seg_dict.pop('bytes', None)
             seg_dict['etag'] = seg_dict.pop('hash', None)
 
-        json_data = json.dumps(segments)  # convert to string
+        json_data = json.dumps(segments, sort_keys=True)  # convert to string
         if six.PY3:
             json_data = json_data.encode('utf-8')
 
@@ -909,6 +909,8 @@ class SloGetContext(WSGIContext):
         for header, value in resp_headers:
             if header.lower() == 'content-length':
                 new_headers.append(('Content-Length', len(json_data)))
+            elif header.lower() == 'etag':
+                new_headers.append(('Etag', md5(json_data).hexdigest()))
             else:
                 new_headers.append((header, value))
         self._response_headers = new_headers

test/functional/test_slo.py

@@ -1098,6 +1098,12 @@ class TestSlo(Base):
         manifest = self.env.container.file("manifest-db")
         got_body = manifest.read(parms={'multipart-manifest': 'get',
                                         'format': 'raw'})
+        body_md5 = hashlib.md5(got_body).hexdigest()
+        headers = dict(
+            (h.lower(), v)
+            for h, v in manifest.conn.response.getheaders())
+        self.assertIn('etag', headers)
+        self.assertEqual(headers['etag'], body_md5)
 
         # raw format should have the actual manifest object content-type
         self.assertEqual('application/octet-stream', manifest.content_type)

test/unit/common/middleware/test_slo.py

@@ -1724,27 +1724,30 @@ class TestSloGetRawManifest(SloTestCase):
                      'HTTP_ACCEPT': 'application/json'})
         status, headers, body = self.call_slo(req)
 
+        expected_body = json.dumps([
+            {'etag': md5hex('b' * 10), 'size_bytes': '10',
+             'path': '/gettest/b_10'},
+            {'etag': md5hex('c' * 15), 'size_bytes': '15',
+             'path': '/gettest/c_15'},
+            {'etag': md5hex(md5hex("e" * 5) + md5hex("f" * 5)),
+             'size_bytes': '10',
+             'path': '/gettest/d_10'}], sort_keys=True)
+        expected_etag = md5hex(expected_body)
+        if six.PY3:
+            expected_body = expected_body.encode('utf-8')
+
+        self.assertEqual(body, expected_body)
         self.assertEqual(status, '200 OK')
-        self.assertTrue(('Etag', self.bc_etag) in headers, headers)
+        self.assertTrue(('Etag', expected_etag) in headers, headers)
         self.assertTrue(('X-Static-Large-Object', 'true') in headers, headers)
         # raw format should return the actual manifest object content-type
         self.assertIn(('Content-Type', 'text/plain'), headers)
 
         try:
-            resp_data = json.loads(body)
+            json.loads(body)
         except ValueError:
             self.fail("Invalid JSON in manifest GET: %r" % body)
 
-        self.assertEqual(
-            resp_data,
-            [{'etag': md5hex('b' * 10), 'size_bytes': '10',
-              'path': '/gettest/b_10'},
-             {'etag': md5hex('c' * 15), 'size_bytes': '15',
-              'path': '/gettest/c_15'},
-             {'etag': md5hex(md5hex("e" * 5) + md5hex("f" * 5)),
-              'size_bytes': '10',
-              'path': '/gettest/d_10'}])
-
     def test_get_raw_manifest_passthrough_with_ranges(self):
         req = Request.blank(
             '/v1/AUTH_test/gettest/manifest-bc-r'