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