Update and enable the clustering app

apps/clustering/registry.py

@@ -0,0 +1,34 @@
+from __future__ import absolute_import
+
+from django.utils.translation import ugettext_lazy as _
+
+from smart_settings import ClusterScope
+
+from .icons import icon_tool_link
+from .literals import (DEFAULT_NODE_HEARTBEAT_INTERVAL, DEFAULT_NODE_HEARTBEAT_TIMEOUT,
+    DEFAULT_DEAD_NODE_REMOVAL_INTERVAL)
+
+label = _(u'Clustering')
+description = _(u'Registers nodes into a Citadel (Mayan EDMS cluster).')
+dependencies = ['app_registry', 'icons', 'navigation', 'scheduler']
+icon = icon_tool_link
+settings = [
+    {
+        'name': 'NODE_HEARTBEAT_INTERVAL',
+        'default': DEFAULT_NODE_HEARTBEAT_INTERVAL,
+        'description': _(u'Interval of time (in seconds) for the node\'s heartbeat update to the cluster.'),
+        'scopes': [ClusterScope()]
+    },
+    {
+        'name': 'NODE_HEARTBEAT_TIMEOUT',
+        'default': DEFAULT_NODE_HEARTBEAT_TIMEOUT,
+        'description': _(u'After this amount of time a node without heartbeat updates is considered dead and removed from the cluster node list.'),
+        'scopes': [ClusterScope()]
+    },
+    {
+        'name': 'DEAD_NODE_REMOVAL_INTERVAL',
+        'default': DEFAULT_DEAD_NODE_REMOVAL_INTERVAL,
+        'description': _(u'Interval of time to check the cluster for unresponsive nodes and remove them from the cluster.'),
+        'scopes': [ClusterScope()]
+    },
+]