ScaleIO: Connection info backward compatibility

When we fixed bug 1823200 in Change-ID
Iab54c515fe7be252df52b1a0503a251779805759 we made the ScaleIO connector
incompatible with the old connection properties dictionary as it only
supported the new 'config_group' and 'failed_over' parameters to get the
password.

This is a problem in any system that is upgraded and has attachments to
the array, because the connection properties of those volumes will not
contain the new fields and detaching them will result in error
"KeyError: 'config_group'".

This patch adds compatibility code to support the old connection
properties format so we can detach those volumes.

Related-Bug: #1823200
Change-Id: I6f01a178616b74ed9a86876ca46e7e46eb360518
(cherry picked from commit 5450483082)

os_brick/initiator/connectors/scaleio.py

@@ -88,12 +88,20 @@ class ScaleIOConnector(base.BaseLinuxConnector):
             raise exception.BrickException(message=msg)
 
     @staticmethod
-    def _get_connector_password(config_group, failed_over):
+    def _get_password_token(connection_properties):
+        # In old connection format we had the password and token in properties
+        if 'serverPassword' in connection_properties:
+            return (connection_properties['serverPassword'],
+                    connection_properties['serverToken'])
+
+        # The new format reads password from file and doesn't have the token
         LOG.info("Get ScaleIO connector password from configuration file")
         try:
-            return priv_scaleio.get_connector_password(CONNECTOR_CONF_PATH,
-                                                       config_group,
-                                                       failed_over)
+            password = priv_scaleio.get_connector_password(
+                CONNECTOR_CONF_PATH,
+                connection_properties['config_group'],
+                connection_properties['failed_over'])
+            return password, None
         except Exception as e:
             msg = _("Error getting ScaleIO connector password from "
                     "configuration file: %s") % e
@@ -320,10 +328,8 @@ class ScaleIOConnector(base.BaseLinuxConnector):
         self.server_ip = connection_properties['serverIP']
         self.server_port = connection_properties['serverPort']
         self.server_username = connection_properties['serverUsername']
-        self.server_password = self._get_connector_password(
-            connection_properties['config_group'],
-            connection_properties['failed_over'],
-        )
+        self.server_password, self.server_token = self._get_password_token(
+            connection_properties)
         self.iops_limit = connection_properties['iopsLimit']
         self.bandwidth_limit = connection_properties['bandwidthLimit']
         device_info = {'type': 'block',

os_brick/tests/initiator/connectors/test_scaleio.py

@@ -173,6 +173,26 @@ class ScaleIOConnectorTestCase(test_connector.ConnectorTestCase):
             self.connector.GET_GUID_OP_CODE)
         self.get_password_mock.assert_called_once()
 
+    def test_connect_volume_old_connection_properties(self):
+        """Successful connect to volume"""
+        connection_properties = {
+            'hostIP': test_connector.MY_IP,
+            'serverIP': test_connector.MY_IP,
+            'scaleIO_volname': self.vol['name'],
+            'scaleIO_volume_id': self.vol['provider_id'],
+            'serverPort': 443,
+            'serverUsername': 'test',
+            'serverPassword': 'fake',
+            'serverToken': 'fake_token',
+            'iopsLimit': None,
+            'bandwidthLimit': None
+        }
+
+        self.connector.connect_volume(connection_properties)
+        self.get_guid_mock.assert_called_once_with(
+            self.connector.GET_GUID_OP_CODE)
+        self.get_password_mock.assert_not_called()
+
     def test_connect_volume_without_volume_id(self):
         """Successful connect to volume without a Volume Id"""
         connection_properties = dict(self.fake_connection_properties)