214 lines
8.3 KiB
Python
214 lines
8.3 KiB
Python
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
|
|
from django.contrib.contenttypes.models import ContentType
|
|
from django.apps import apps
|
|
from django.core import validators
|
|
from django.db import models
|
|
from django.utils import timezone
|
|
from django.utils.translation import ugettext_lazy as _
|
|
from djcelery.models import PeriodicTask, CrontabSchedule
|
|
|
|
from orchestra.models import queryset, fields
|
|
|
|
from . import helpers
|
|
from .backends import ServiceMonitor
|
|
|
|
|
|
class ResourceQuerySet(models.QuerySet):
|
|
group_by = queryset.group_by
|
|
|
|
|
|
class Resource(models.Model):
|
|
"""
|
|
Defines a resource, a resource is basically an interpretation of data
|
|
gathered by a Monitor
|
|
"""
|
|
|
|
LAST = 'LAST'
|
|
MONTHLY_SUM = 'MONTHLY_SUM'
|
|
MONTHLY_AVG = 'MONTHLY_AVG'
|
|
PERIODS = (
|
|
(LAST, _("Last")),
|
|
(MONTHLY_SUM, _("Monthly Sum")),
|
|
(MONTHLY_AVG, _("Monthly Average")),
|
|
)
|
|
_related = set() # keeps track of related models for resource cleanup
|
|
|
|
name = models.CharField(_("name"), max_length=32,
|
|
help_text=_('Required. 32 characters or fewer. Lowercase letters, '
|
|
'digits and hyphen only.'),
|
|
validators=[validators.RegexValidator(r'^[a-z0-9_\-]+$',
|
|
_('Enter a valid name.'), 'invalid')])
|
|
verbose_name = models.CharField(_("verbose name"), max_length=256)
|
|
content_type = models.ForeignKey(ContentType,
|
|
help_text=_("Model where this resource will be hooked."))
|
|
period = models.CharField(_("period"), max_length=16, choices=PERIODS,
|
|
default=LAST,
|
|
help_text=_("Operation used for aggregating this resource monitored"
|
|
"data."))
|
|
on_demand = models.BooleanField(_("on demand"), default=False,
|
|
help_text=_("If enabled the resource will not be pre-allocated, "
|
|
"but allocated under the application demand"))
|
|
default_allocation = models.PositiveIntegerField(_("default allocation"),
|
|
null=True, blank=True,
|
|
help_text=_("Default allocation value used when this is not an "
|
|
"on demand resource"))
|
|
unit = models.CharField(_("unit"), max_length=16,
|
|
help_text=_("The unit in which this resource is measured. "
|
|
"For example GB, KB or subscribers"))
|
|
scale = models.PositiveIntegerField(_("scale"),
|
|
help_text=_("Scale in which this resource monitoring resoults should "
|
|
"be prorcessed to match with unit."))
|
|
disable_trigger = models.BooleanField(_("disable trigger"), default=False,
|
|
help_text=_("Disables monitors exeeded and recovery triggers"))
|
|
crontab = models.ForeignKey(CrontabSchedule, verbose_name=_("crontab"),
|
|
null=True, blank=True,
|
|
help_text=_("Crontab for periodic execution. "
|
|
"Leave it empty to disable periodic monitoring"))
|
|
monitors = fields.MultiSelectField(_("monitors"), max_length=256, blank=True,
|
|
choices=ServiceMonitor.get_plugin_choices(),
|
|
help_text=_("Monitor backends used for monitoring this resource."))
|
|
is_active = models.BooleanField(_("active"), default=True)
|
|
|
|
objects = ResourceQuerySet.as_manager()
|
|
|
|
class Meta:
|
|
unique_together = (
|
|
('name', 'content_type'),
|
|
('verbose_name', 'content_type')
|
|
)
|
|
|
|
def __unicode__(self):
|
|
return "{}-{}".format(str(self.content_type), self.name)
|
|
|
|
def save(self, *args, **kwargs):
|
|
created = not self.pk
|
|
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:
|
|
if self.is_active:
|
|
PeriodicTask.objects.create(
|
|
name=name,
|
|
task='resources.Monitor',
|
|
args=[self.pk],
|
|
crontab=self.crontab
|
|
)
|
|
else:
|
|
if not self.is_active:
|
|
task.delete()
|
|
elif task.crontab != self.crontab:
|
|
task.crontab = self.crontab
|
|
task.save(update_fields=['crontab'])
|
|
# This only work on tests (multiprocessing used on real deployments)
|
|
apps.get_app_config('resources').reload_relations()
|
|
# TODO touch wsgi.py for code reloading?
|
|
|
|
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()
|
|
|
|
|
|
class ResourceData(models.Model):
|
|
""" Stores computed resource usage and allocation """
|
|
resource = models.ForeignKey(Resource, related_name='dataset', verbose_name=_("resource"))
|
|
content_type = models.ForeignKey(ContentType, verbose_name=_("content type"))
|
|
object_id = models.PositiveIntegerField(_("object id"))
|
|
used = models.PositiveIntegerField(_("used"), null=True)
|
|
updated_at = models.DateTimeField(_("updated"), null=True)
|
|
allocated = models.PositiveIntegerField(_("allocated"), null=True, blank=True)
|
|
|
|
content_object = GenericForeignKey()
|
|
|
|
class Meta:
|
|
unique_together = ('resource', 'content_type', 'object_id')
|
|
verbose_name_plural = _("resource data")
|
|
|
|
@classmethod
|
|
def get_or_create(cls, obj, resource):
|
|
ct = ContentType.objects.get_for_model(type(obj))
|
|
try:
|
|
return cls.objects.get(content_type=ct, object_id=obj.pk, resource=resource)
|
|
except cls.DoesNotExist:
|
|
return cls.objects.create(content_object=obj, resource=resource,
|
|
allocated=resource.default_allocation)
|
|
|
|
@property
|
|
def unit(self):
|
|
return self.resource.unit
|
|
|
|
def get_used(self):
|
|
return helpers.compute_resource_usage(self)
|
|
|
|
def update(self, current=None):
|
|
if current is None:
|
|
current = self.get_used()
|
|
self.used = current or 0
|
|
self.updated_at = timezone.now()
|
|
self.save(update_fields=['used', 'updated_at'])
|
|
|
|
|
|
class MonitorData(models.Model):
|
|
""" Stores monitored data """
|
|
monitor = models.CharField(_("monitor"), max_length=256,
|
|
choices=ServiceMonitor.get_plugin_choices())
|
|
content_type = models.ForeignKey(ContentType, verbose_name=_("content type"))
|
|
object_id = models.PositiveIntegerField(_("object id"))
|
|
created_at = models.DateTimeField(_("created"), auto_now_add=True)
|
|
value = models.DecimalField(_("value"), max_digits=16, decimal_places=2)
|
|
|
|
content_object = GenericForeignKey()
|
|
|
|
class Meta:
|
|
get_latest_by = 'id'
|
|
verbose_name_plural = _("monitor data")
|
|
|
|
def __unicode__(self):
|
|
return str(self.monitor)
|
|
|
|
|
|
def create_resource_relation():
|
|
class ResourceHandler(object):
|
|
""" account.resources.web """
|
|
def __getattr__(self, attr):
|
|
""" get or build ResourceData """
|
|
try:
|
|
data = self.obj.resource_set.get(resource__name=attr)
|
|
except ResourceData.DoesNotExist:
|
|
model = self.obj._meta.model_name
|
|
resource = Resource.objects.get(content_type__model=model, name=attr,
|
|
is_active=True)
|
|
data = ResourceData(content_object=self.obj, resource=resource,
|
|
allocated=resource.default_allocation)
|
|
return data
|
|
|
|
def __get__(self, obj, cls):
|
|
""" proxy handled object """
|
|
self.obj = obj
|
|
return self
|
|
|
|
# Clean previous state
|
|
for related in Resource._related:
|
|
try:
|
|
delattr(related, 'resource_set')
|
|
delattr(related, 'resources')
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
related._meta.virtual_fields = [
|
|
field for field in related._meta.virtual_fields if field.rel.to != ResourceData
|
|
]
|
|
|
|
relation = GenericRelation('resources.ResourceData')
|
|
for ct, resources in Resource.objects.group_by('content_type').iteritems():
|
|
model = ct.model_class()
|
|
model.add_to_class('resource_set', relation)
|
|
model.resources = ResourceHandler()
|
|
Resource._related.add(model)
|