From 75a87df739effe840e6cb39c976002e99b49c796 Mon Sep 17 00:00:00 2001
From: Rick Harris <rconradharris@gmail.com>
Date: Wed, 22 Jun 2011 13:31:28 -0500
Subject: Round 1 of backup with rotation.

---
 nova/compute/api.py     | 32 ++++++++++++++++++++++++++++++--
 nova/compute/manager.py | 20 ++++++++++++++++++--
 2 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/nova/compute/api.py b/nova/compute/api.py
index a7ea88d51..365aa1c5d 100644
--- a/nova/compute/api.py
+++ b/nova/compute/api.py
@@ -701,18 +701,46 @@ class API(base.Base):
         raise exception.Error(_("Unable to find host for Instance %s")
                                 % instance_id)
 
+    def backup(self, context, instance_id, backup_type, rotation):
+        """Backup the given instance
+
+            instance_id - int - id representing the instance
+            backup_type - str - whether it's 'daily' or 'weekly'
+            rotation - int - number of backups to keep around
+        """
+        name = backup_type  # daily backups are called 'daily'
+        recv_meta = self._snapshot(context, instance_id, name, backup_type,
+                                   rotation=rotation)
+        return recv_meta
+
     def snapshot(self, context, instance_id, name):
         """Snapshot the given instance.
 
         :returns: A dict containing image metadata
         """
-        properties = {'instance_id': str(instance_id),
+        return self._snapshot(context, instance_id, name, 'snapshot')
+
+    def _snapshot(self, context, instance_id, name, image_type, rotation=None):
+        """Snapshot an instance on this host.
+       
+        :param context: security context
+        :param instance_id: nova.db.sqlalchemy.models.Instance.Id
+        :param name: string for name of the snapshot
+        :param image_type: snapshot | daily | weekly
+        :param rotation: int representing how many backups to keep around;
+            None if rotation shouldn't be used (as in the case of snapshots)
+        """
+        instance = db.api.instance_get(context, instance_id)
+        properties = {'instance_uuid': instance['uuid'],
                       'user_id': str(context.user_id),
                       'image_state': 'creating'}
+        if image_type != 'snapshot':
+            properties['backup_type'] = image_type
         sent_meta = {'name': name, 'is_public': False,
                      'status': 'creating', 'properties': properties}
         recv_meta = self.image_service.create(context, sent_meta)
-        params = {'image_id': recv_meta['id']}
+        params = {'image_id': recv_meta['id'], 'image_type': image_type,
+                  'rotation': rotation}
         self._cast_compute_message('snapshot_instance', context, instance_id,
                                    params=params)
         return recv_meta
diff --git a/nova/compute/manager.py b/nova/compute/manager.py
index 4e006e677..bc6981c58 100644
--- a/nova/compute/manager.py
+++ b/nova/compute/manager.py
@@ -473,8 +473,17 @@ class ComputeManager(manager.SchedulerDependentManager):
         self._update_state(context, instance_id)
 
     @exception.wrap_exception
-    def snapshot_instance(self, context, instance_id, image_id):
-        """Snapshot an instance on this host."""
+    def snapshot_instance(self, context, instance_id, image_id,
+                          image_type='snapshot', rotation=None):
+        """Snapshot an instance on this host.
+       
+        :param context: security context
+        :param instance_id: nova.db.sqlalchemy.models.Instance.Id
+        :param image_id: glance.db.sqlalchemy.models.Image.Id
+        :param image_type: snapshot | daily | weekly
+        :param rotation: int representing how many backups to keep around;
+            None if rotation shouldn't be used (as in the case of snapshots)
+        """
         context = context.elevated()
         instance_ref = self.db.instance_get(context, instance_id)
 
@@ -493,6 +502,13 @@ class ComputeManager(manager.SchedulerDependentManager):
                        'expected: %(running)s)') % locals())
 
         self.driver.snapshot(instance_ref, image_id)
+        if rotation:
+            self.rotate_backups(context, instance_id, image_type, rotation)
+
+    def rotate_backups(self, context, instance_id, image_type, rotation):
+        """
+        """
+        pass
 
     @exception.wrap_exception
     @checks_instance_lock
-- 
cgit