Resource monitoring implementation

orchestra/apps/accounts/models.py

@@ -2,6 +2,8 @@ from django.conf import settings as django_settings
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
+from orchestra.core import services
+
 from . import settings
 
 
@@ -23,3 +25,6 @@ class Account(models.Model):
     def name(self):
         self._cached_name = getattr(self, '_cached_name', self.user.username)
         return self._cached_name
+
+
+services.register(Account, menu=False)

orchestra/apps/orchestration/admin.py

@@ -30,7 +30,7 @@ class RouteAdmin(admin.ModelAdmin):
     
     def display_model(self, route):
         try:
-            return route.get_backend().model
+            return route.backend_class().model
         except KeyError:
             return "<span style='color: red;'>NOT AVAILABLE</span>"
     display_model.short_description = _("model")
@@ -38,7 +38,7 @@ class RouteAdmin(admin.ModelAdmin):
     
     def display_actions(self, route):
         try:
-            return '<br>'.join(route.get_backend().get_actions())
+            return '<br>'.join(route.backend_class().get_actions())
         except KeyError:
             return "<span style='color: red;'>NOT AVAILABLE</span>"
     display_actions.short_description = _("actions")

orchestra/apps/orchestration/backends.py

@@ -67,6 +67,13 @@ class ServiceBackend(object):
     def get_backends(cls):
         return cls.plugins
     
+    @classmethod
+    def get_backend(cls, name):
+        for backend in ServiceMonitor.get_backends():
+            if backend.get_name() == name:
+                return backend
+        raise KeyError('This backend is not registered')
+    
     @classmethod
     def get_choices(cls):
         backends = cls.get_backends()

orchestra/apps/orchestration/models.py

@@ -5,6 +5,7 @@ from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
 from orchestra.utils.apps import autodiscover
+from orchestra.utils.functional import cached
 
 from . import settings, manager
 from .backends import ServiceBackend
@@ -146,30 +147,39 @@ class Route(models.Model):
 #            raise ValidationError(msg % (self.backend, self.method)
     
     @classmethod
-    def get_servers(cls, operation):
+    @cached
-        # TODO use cached data sctructure and refactor
+    def get_routing_table(cls):
-        backend = operation.backend
+        table = {}
-        servers = []
+        for route in cls.objects.filter(is_active=True):
+            for action in route.backend_class().get_actions():
+                key = (route.backend, action)
                 try:
-            routes = cls.objects.filter(is_active=True, backend=backend.get_name())
+                    table[key].append(route)
-        except cls.DoesNotExist:
+                except KeyError:
+                    table[key] = [route]
+        return table
+    
+    @classmethod
+    def get_servers(cls, operation):
+        table = cls.get_routing_table()
+        servers = []
+        key = (operation.backend.get_name(), operation.action)
+        try:
+            routes = table[key]
+        except KeyError:
             return servers
         safe_locals = {
             'instance': operation.instance
         }
-        actions = backend.get_actions()
         for route in routes:
-            if operation.action in actions and eval(route.match, safe_locals):
+            if eval(route.match, safe_locals):
                 servers.append(route.host)
         return servers
     
-    def get_backend(self):
+    def backend_class(self):
-        for backend in ServiceBackend.get_backends():
+        return ServiceBackend.get_backend(self.backend)
-            if backend.get_name() == self.backend:
-                return backend
-        raise KeyError('This backend is not registered')
     
-#    def get_method_class(self):
+#    def method_class(self):
 #        for method in MethodBackend.get_backends():
 #            if method.get_name() == self.method:
 #                return method

orchestra/apps/resources/admin.py

@@ -5,6 +5,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from orchestra.admin.filters import UsedContentTypeFilter
 from orchestra.admin.utils import insertattr, get_modeladmin
+from orchestra.core import services
 from orchestra.utils import running_syncdb
 
 from .forms import ResourceForm
@@ -12,6 +13,8 @@ from .models import Resource, ResourceData, MonitorData
 
 
 class ResourceAdmin(admin.ModelAdmin):
+    # TODO warning message server/celery should be restarted when creating things
+    
     list_display = (
         'name', 'verbose_name', 'content_type', 'period', 'ondemand',
         'default_allocation', 'disable_trigger'
@@ -30,6 +33,13 @@ class ResourceAdmin(admin.ModelAdmin):
             inlines.append(inline)
         modeladmin.inlines = inlines
     
+    def formfield_for_dbfield(self, db_field, **kwargs):
+        """ filter service content_types """
+        if db_field.name == 'content_type':
+            models = [ model._meta.model_name for model in services.get().keys() ]
+            kwargs['queryset'] = db_field.rel.to.objects.filter(model__in=models)
+        return super(ResourceAdmin, self).formfield_for_dbfield(db_field, **kwargs)
+
 
 class ResourceDataAdmin(admin.ModelAdmin):
     list_display = ('id', 'resource', 'used', 'allocated', 'last_update',) # TODO content_object

orchestra/apps/resources/apps.py

@@ -9,10 +9,6 @@ class ResourcesConfig(AppConfig):
     verbose_name = 'Resources'
     
     def ready(self):
-        from .models import Resource
-        # TODO execute on Resource.save()
         if not running_syncdb():
-            relation = generic.GenericRelation('resources.ResourceData')
+            from .models import create_resource_relation
-            for resources in Resource.group_by_content_type():
+            create_resource_relation()
-                model = resources[0].content_type.model_class()
-                model.add_to_class('resources', relation)

orchestra/apps/resources/forms.py

@@ -9,7 +9,7 @@ class ResourceForm(forms.ModelForm):
             required=False)
     used = forms.IntegerField(label=_("Used"), widget=ShowTextWidget(),
             required=False)
-    last_update = forms.CharField(label=_("Last update"), widget=ShowTextWidget(),
+    last_update = forms.DateTimeField(label=_("Last update"), widget=ShowTextWidget(),
             required=False)
     allocated = forms.IntegerField(label=_("Allocated"))
     
@@ -21,7 +21,7 @@ class ResourceForm(forms.ModelForm):
         super(ResourceForm, self).__init__(*args, **kwargs)
         if self.resource:
             self.fields['verbose_name'].initial = self.resource.verbose_name
-            self.fields['used'].initial = self.resource.get_current()
+            self.fields['used'].initial = self.resource.get_used() # TODO
             if self.resource.ondemand:
                 self.fields['allocated'].required = False
                 self.fields['allocated'].widget = ReadOnlyWidget(None, '')

orchestra/apps/resources/models.py

@@ -42,12 +42,35 @@ class Resource(models.Model):
             null=True, blank=True)
     is_active = models.BooleanField(_("is active"), default=True)
     disable_trigger = models.BooleanField(_("disable trigger"), default=False)
+    crontab = models.ForeignKey(CrontabSchedule, verbose_name=_("crontab"),
+            help_text=_("Crontab for periodic execution"))
+    # TODO create custom field that returns backend python objects
     monitors = MultiSelectField(_("monitors"), max_length=256,
             choices=ServiceMonitor.get_choices())
     
     def __unicode__(self):
         return self.name
     
+    def save(self, *args, **kwargs):
+        super(Resource, self).save(*args, **kwargs)
+        # Create Celery periodic task
+        name = 'monitor.%s' % str(self)
+        try:
+            task = PeriodicTask.objects.get(name=name)
+        except PeriodicTask.DoesNotExist:
+            PeriodicTask.objects.create(name=name, task='resources.Monitor',
+                                        args=[self.pk], crontab=self.crontab)
+        else: 
+            if task.crontab != self.crontab:
+                task.crontab = self.crontab
+                task.save()
+            
+    def delete(self, *args, **kwargs):
+        super(Resource, self).delete(*args, **kwargs)
+        name = 'monitor.%s' % str(self)
+        PeriodicTask.objects.filter(name=name, task='resources.Monitor',
+                                    args=[self.pk]).delete()
+    
     @classmethod
     def group_by_content_type(cls):
         prev = None
@@ -64,13 +87,39 @@ class Resource(models.Model):
         if group:
             yield group
 
-    def get_current(self):
+
+class ResourceData(models.Model):
+    """ Stores computed resource usage and allocation """
+    resource = models.ForeignKey(Resource, related_name='dataset')
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    used = models.PositiveIntegerField(null=True)
+    last_update = models.DateTimeField(null=True)
+    allocated = models.PositiveIntegerField(null=True)
+    
+    content_object = generic.GenericForeignKey()
+    
+    class Meta:
+        unique_together = ('resource', 'content_type', 'object_id')
+        verbose_name_plural = _("resource data")
+    
+    @classmethod
+    def get_or_create(cls, obj, resource):
+        try:
+            return cls.objects.get(content_object=obj, resource=resource)
+        except cls.DoesNotExists:
+            return cls.objects.create(content_object=obj, resource=resource,
+                                      allocated=resource.defalt_allocation)
+    
+    def get_used(self):
+        resource = self.resource
         today = datetime.date.today()
         result = 0
         has_result = False
-        for monitor in self.monitors:
+        for monitor in resource.monitors:
-            dataset = MonitorData.objects.filter(monitor=monitor)
+            dataset = MonitorData.objects.filter(monitor=monitor,
-            if self.period == self.MONTHLY_AVG:
+                    content_type=self.content_type, object_id=self.object_id)
+            if resource.period == resource.MONTHLY_AVG:
                 try:
                     last = dataset.latest()
                 except MonitorData.DoesNotExist:
@@ -83,14 +132,14 @@ class Resource(models.Model):
                 for data in dataset:
                     slot = (previous-data.date).total_seconds()
                     result += data.value * slot/total
-            elif self.period == self.MONTHLY_SUM:
+            elif resource.period == resource.MONTHLY_SUM:
                 data = dataset.filter(date__year=today.year,
                                       date__month=today.month)
                 value = data.aggregate(models.Sum('value'))['value__sum']
                 if value:
                     has_result = True
                     result += value
-            elif self.period == self.LAST:
+            elif resource.period == resource.LAST:
                 try:
                     result += dataset.latest().value
                 except MonitorData.DoesNotExist:
@@ -101,21 +150,6 @@ class Resource(models.Model):
         return result if has_result else None
 
 
-class ResourceData(models.Model):
-    """ Stores computed resource usage and allocation """
-    resource = models.ForeignKey(Resource)
-    content_type = models.ForeignKey(ContentType)
-    object_id = models.PositiveIntegerField()
-    used = models.PositiveIntegerField(null=True)
-    last_update = models.DateTimeField(null=True)
-    allocated = models.PositiveIntegerField(null=True)
-    
-    content_object = generic.GenericForeignKey()
-    
-    class Meta:
-        unique_together = ('resource', 'content_type', 'object_id')
-        verbose_name_plural = _("resource data")
-
 class MonitorData(models.Model):
     """ Stores monitored data """
     monitor = models.CharField(_("monitor"), max_length=256,
@@ -133,3 +167,10 @@ class MonitorData(models.Model):
     
     def __unicode__(self):
         return str(self.monitor)
+
+
+def create_resource_relation():
+    relation = generic.GenericRelation('resources.ResourceData')
+    for resources in Resource.group_by_content_type():
+        model = resources[0].content_type.model_class()
+        model.add_to_class('resources', relation)

orchestra/apps/resources/tasks.py

@@ -1,14 +1,38 @@
 from celery import shared_task
 
+from orchestra.apps.orchestration.models import BackendOperation as Operation
+
 from .backends import ServiceMonitor
+from .models import MonitorData
 
 
-@shared_task
+@shared_task(name='resources.Monitor')
-def monitor(backend_name):
+def monitor(resource_id):
-    routes = Route.objects.filter(is_active=True, backend=backend_name)
+    resource = Resource.objects.get(pk=resource_id)
-    for route in routes:
+    
-        pass
+    # Execute monitors
-    for backend in ServiceMonitor.get_backends():
+    for monitor_name in resource.monitors:
-        if backend.get_name() == backend_name:
+        backend = ServiceMonitor.get_backend(monitor_name)
-    # TODO execute monitor BackendOperation
+        model = backend.model
-           pass
+        operations = []
+        # Execute monitor
+        for obj in model.objects.all():
+            operations.append(Operation.create(backend, obj, Operation.MONITOR))
+        Operation.execute(operations)
+    
+    # Update used resources and trigger resource exceeded and revovery
+    operations = []
+    model = resource.model
+    for obj in model.objects.all():
+        data = MonitorData.get_or_create(obj, resource)
+        current = data.get_used()
+        if data.used < data.allocated and current > data.allocated:
+            op = Operation.create(backend, data.content_object, Operation.EXCEED)
+            operations.append(op)
+        elif res.used > res.allocated and current < res.allocated:
+            op = Operation.create(backend, data.content_object, Operation.RECOVERY)
+            operation.append(op)
+        data.used = current
+        data.las_update = datetime.now()
+        data.save()
+    Operation.execute(operations)