NetApp ONTAP: Add revert to snapshot functions on REST client

This patch adds the function rename_file and its unit test, other
functions used in the 'revert to snapshot' operation were
migrated in a previous patch.

Change-Id: I36076414de9d1d31429ffd63817631fedd5df7cc
partially-implements: blueprint netapp-ontap-rest-api-client

cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_client_cmode_rest.py

@@ -3688,3 +3688,22 @@ class NetAppRestCmodeClientTestCase(test.TestCase):
             f'/cluster/jobs/{job_uuid}', 'get', query=query,
             enable_tunneling=False)
         self.assertEqual(expected_result, result)
+
+    def test_rename_file(self):
+        volume = fake_client.VOLUME_ITEM_SIMPLE_RESPONSE_REST
+        orig_file_name = f'/vol/{fake_client.VOLUME_NAMES[0]}/cinder-vol'
+        new_file_name = f'/vol/{fake_client.VOLUME_NAMES[0]}/new-cinder-vol'
+        body = {'path': new_file_name.split('/')[3]}
+
+        self.mock_object(self.client, 'send_request')
+        self.mock_object(self.client, '_get_volume_by_args',
+                         return_value=volume)
+
+        self.client.rename_file(orig_file_name, new_file_name)
+
+        orig_file_name = orig_file_name.split('/')[3]
+        self.client.send_request.assert_called_once_with(
+            f'/storage/volumes/{volume["uuid"]}/files/{orig_file_name}',
+            'patch', body=body)
+        self.client._get_volume_by_args.assert_called_once_with(
+            vol_name=fake_client.VOLUME_NAMES[0])

cinder/volume/drivers/netapp/dataontap/client/client_cmode_rest.py

@@ -2497,3 +2497,25 @@ class RestClient(object):
         }
 
         return copy_status
+
+    def rename_file(self, orig_file_name, new_file_name):
+        """Rename a volume file."""
+        LOG.debug("Renaming the file %(original)s to %(new)s.",
+                  {'original': orig_file_name, 'new': new_file_name})
+
+        unique_volume = self._get_volume_by_args(
+            vol_name=orig_file_name.split('/')[2])
+
+        # Get the relative path
+        orig_file_name = '/'.join(orig_file_name.split('/')[3:])
+        new_file_name = '/'.join(new_file_name.split('/')[3:])
+
+        # Path requires "%2E" to represent "." and "%2F" to represent "/".
+        orig_file_name = orig_file_name.replace('.', '%2E').replace('/', '%2F')
+        new_file_name = new_file_name.replace('.', '%2E').replace('/', '%2F')
+
+        body = {'path': new_file_name}
+
+        self.send_request(
+            f'/storage/volumes/{unique_volume["uuid"]}/files/{orig_file_name}',
+            'patch', body=body)

releasenotes/notes/netapp-ontap-rest-api-client-d889cfa895f01249.yaml

@@ -3,8 +3,17 @@ features:
   - |
     NetApp drivers: NFS, iSCSI and FCP drivers have now the option to request
     ONTAP operations through REST API. The new option `netapp_use_legacy_client`
-    switch between the old ZAPI client approach and new REST client. It is
+    switches between the old ZAPI client approach and new REST client. It is
     default to `True`, meaning that the drivers will keep working as before
-    using ZAPI operations. If desired, this option can be set to `False` connecting
-    with new REST client that performs REST API operations if it is available,
-    otherwise falls back to ZAPI.
+    using ZAPI operations. If desired, this option can be set to `False` interacting
+    with  the storage using the new REST client. However, this new client still
+    relies on ZAPI calls for consistency group snapshot operation.
+
+    The drivers can only be configured with REST client when using ONTAP storage
+    9.11.1 or newer.
+
+    NOTE: Enabling ONTAP REST client changes the behavior of QoS specs. Earlier,
+    QoS values could be represented in BPS (bytes per second), but now REST client
+    only supports integer values represented in MBPS (Megabytes per second).
+    It means that though the user specifies the value in BPS, it will be converted
+    to MBPS and rounded up.