vm: implement vm expiration

circle/dashboard/templates/dashboard/notifications/vm-destroyed.html

+{%load i18n%}
+{%blocktrans with instance=instance.name url=instance.get_absolute_url %}
+Your instance <a href="{{url}}">{{instance}}</a> has been destroyed due to expiration.
+{%endblocktrans%} 

circle/dashboard/templates/dashboard/notifications/vm-suspended.html

+{%load i18n%}
+{%blocktrans with instance=instance.name url=instance.get_absolute_url %}
+Your instance <a href="{{url}}">{{instance}}</a> has been suspended due to expiration.
+{%endblocktrans%} 

circle/manager/mancelery.py

@@ -28,11 +28,16 @@ celery.conf.update(
             'schedule': timedelta(seconds=5),
             'options': {'queue': 'localhost.man'}
         },
-        'vm.periodic_tasks': {
+        'vm.update_domain_states': {
             'task': 'vm.tasks.local_periodic_tasks.update_domain_states',
             'schedule': timedelta(seconds=10),
             'options': {'queue': 'localhost.man'}
         },
+        'vm.garbage_collector': {
+            'task': 'vm.tasks.local_periodic_tasks.garbage_collector',
+            'schedule': timedelta(minutes=10),
+            'options': {'queue': 'localhost.man'}
+        },
         'storage.periodic_tasks': {
             'task': 'storage.tasks.periodic_tasks.garbage_collector',
             'schedule': timedelta(hours=1),

circle/vm/tasks/local_periodic_tasks.py

+from datetime import datetime
+import logging
+from django.utils import timezone
+from django.utils.translation import ugettext_lazy as _
+
 from manager.mancelery import celery
-from vm.models import Node
+from vm.models import Node, Instance
+
+logger = logging.getLogger(__name__)
 
 
 @celery.task(ignore_result=True)
@@ -7,3 +14,39 @@ def update_domain_states():
     nodes = Node.objects.filter(enabled=True).all()
     for node in nodes:
         node.update_vm_states()
+
+
+@celery.task(ignore_result=True)
+def garbage_collector(timeout=15):
+    """Garbage collector for instances.
+
+    Suspends and destroys expired instances.
+
+    :param timeout: Seconds before TimeOut exception
+    :type timeout: int
+    """
+    now = timezone.now()
+    for i in Instance.objects.filter(destroyed=None).all():
+        if i.time_of_delete and now < i.time_of_delete:
+            i.destroy_async()
+            logger.info("Expired instance %d destroyed.", i.pk)
+            try:
+                i.owner.profile.notify(
+                    _('Machine destroyed'),
+                    'dashboard/notifications/vm-destroyed.html',
+                    {'instance': i})
+            except:
+                logger.debug('Could not notify owner of instance %d.', i.pk)
+        elif (i.time_of_suspend and now < i.time_of_suspend and
+              i.state == 'RUNNING'):
+            i.sleep_async()
+            logger.info("Expired instance %d suspended." % i.pk)
+            try:
+                i.owner.profile.notify(
+                    _('Machine suspended'),
+                    'dashboard/notifications/vm-suspended.html',
+                    {'instance': i})
+            except:
+                logger.debug('Could not notify owner of instance %d.', i.pk)
+        else:
+            logger.debug("Instance %d didn't expire." % i.pk)