344 lines
13 KiB
Python
344 lines
13 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.db import models
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from django.utils import timezone
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from django.utils.functional import cached_property
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from django.utils.translation import ugettext_lazy as _
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from djcelery.models import PeriodicTask
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from orchestra.core import validators
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from orchestra.models import queryset, fields
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from orchestra.models.utils import get_model_field_path
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from . import tasks
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from .backends import ServiceMonitor
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from .aggregations import Aggregation
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from .validators import validate_scale
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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 avg")),
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)
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_related = set() # keeps track of related models for resource cleanup
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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.validate_name])
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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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aggregation = models.CharField(_("aggregation"), max_length=16,
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choices=Aggregation.get_choices(), default=Aggregation.get_choices()[0][0],
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help_text=_("Method used for aggregating this resource monitored 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 represented. "
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"For example GB, KB or subscribers"))
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scale = models.CharField(_("scale"), max_length=32, validators=[validate_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. e.g. <tt>10**9</tt>"))
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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('djcelery.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_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 __str__(self):
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return "{}-{}".format(str(self.content_type), self.name)
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@cached_property
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def aggregation_class(self):
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return Aggregation.get(self.aggregation)
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@cached_property
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def aggregation_instance(self):
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""" Per request lived type_instance """
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return self.aggregation_class(self)
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def clean(self):
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self.verbose_name = self.verbose_name.strip()
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if self.on_demand and self.default_allocation:
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raise validators.ValidationError({
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'default_allocation': _("Default allocation can not be set for 'on demand' services")
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})
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# Validate that model path exists between ct and each monitor.model
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monitor_errors = []
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for monitor in self.monitors:
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try:
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self.get_model_path(monitor)
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except (RuntimeError, LookupError):
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model = apps.get_model(ServiceMonitor.get_backend(monitor).model)
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monitor_errors.append(model._meta.model_name)
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if monitor_errors:
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model_name = self.content_type.model_class()._meta.model_name
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raise validators.ValidationError({
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'monitors': [
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_("Path does not exists between '%s' and '%s'") % (
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error,
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model_name,
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) for error in monitor_errors
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]})
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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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self.sync_periodic_task()
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# This only works on tests (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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self.sync_periodic_task()
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def sync_periodic_task(self):
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name = 'monitor.%s' % str(self)
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if self.pk and self.crontab and self.is_active:
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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 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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else:
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PeriodicTask.objects.filter(name=name).delete()
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def get_model_path(self, monitor):
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""" returns a model path between self.content_type and monitor.model """
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resource_model = self.content_type.model_class()
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monitor_model = ServiceMonitor.get_backend(monitor).model_class()
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return get_model_field_path(monitor_model, resource_model)
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def get_scale(self):
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return eval(self.scale)
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def get_verbose_name(self):
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return self.verbose_name or self.name
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def monitor(self, async=True):
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if async:
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return tasks.monitor.apply_async(self.pk)
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return tasks.monitor(self.pk)
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class ResourceDataQuerySet(models.QuerySet):
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def get_or_create(self, obj, resource):
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ct = ContentType.objects.get_for_model(type(obj))
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try:
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return self.get(
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content_type=ct,
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object_id=obj.pk,
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resource=resource
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), False
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except self.model.DoesNotExist:
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return self.create(
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content_object=obj,
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resource=resource,
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allocated=resource.default_allocation
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), True
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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"), db_index=True)
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object_id = models.PositiveIntegerField(_("object id"), db_index=True)
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used = models.DecimalField(_("used"), max_digits=16, decimal_places=3, null=True,
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editable=False)
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updated_at = models.DateTimeField(_("updated"), null=True, editable=False)
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allocated = models.PositiveIntegerField(_("allocated"), null=True, blank=True)
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content_object_repr = models.CharField(_("content object representation"), max_length=256,
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editable=False)
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content_object = GenericForeignKey()
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objects = ResourceDataQuerySet.as_manager()
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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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def __str__(self):
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return "%s: %s" % (str(self.resource), str(self.content_object))
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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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resource = self.resource
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total = 0
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has_result = False
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for monitor, dataset in self.get_monitor_datasets():
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dataset = resource.aggregation_instance.filter(dataset)
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usage = resource.aggregation_instance.compute_usage(dataset)
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if usage is not None:
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has_result = True
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total += usage
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return float(total)/resource.get_scale() if has_result else None
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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.content_object_repr = str(self.content_object)
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self.save(update_fields=('used', 'updated_at', 'content_object_repr'))
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def monitor(self, async=False):
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ids = (self.object_id,)
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if async:
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return tasks.monitor.delay(self.resource_id, ids=ids)
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return tasks.monitor(self.resource_id, ids=ids)
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def get_monitor_datasets(self):
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resource = self.resource
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for monitor in resource.monitors:
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path = resource.get_model_path(monitor)
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if path == []:
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dataset = MonitorData.objects.filter(
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monitor=monitor,
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content_type=self.content_type_id,
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object_id=self.object_id,
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)
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else:
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fields = '__'.join(path)
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monitor_model = ServiceMonitor.get_backend(monitor).model_class()
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objects = monitor_model.objects.filter(**{fields: self.object_id})
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pks = objects.values_list('id', flat=True)
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ct = ContentType.objects.get_for_model(monitor_model)
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dataset = MonitorData.objects.filter(
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monitor=monitor,
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content_type=ct,
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object_id__in=pks,
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)
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yield monitor, dataset
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class MonitorDataQuerySet(models.QuerySet):
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group_by = queryset.group_by
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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, db_index=True,
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choices=ServiceMonitor.get_choices())
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content_type = models.ForeignKey(ContentType, verbose_name=_("content type"), db_index=True)
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object_id = models.PositiveIntegerField(_("object id"), db_index=True)
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created_at = models.DateTimeField(_("created"), default=timezone.now, db_index=True)
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value = models.DecimalField(_("value"), max_digits=16, decimal_places=2)
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state = models.DecimalField(_("state"), max_digits=16, decimal_places=2, null=True,
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help_text=_("Optional field used to store current state needed for diff-based monitoring."))
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content_object_repr = models.CharField(_("content object representation"), max_length=256,
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editable=False)
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content_object = GenericForeignKey()
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objects = MonitorDataQuerySet.as_manager()
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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 __str__(self):
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return str(self.monitor)
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@cached_property
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def unit(self):
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return self.resource.unit
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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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return self.obj.__resource_cache[attr]
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except AttributeError:
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self.obj.__resource_cache = {}
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except KeyError:
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pass
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try:
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rdata = 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(
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content_type__model=model,
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name=attr,
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is_active=True
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)
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rdata = ResourceData(
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content_object=self.obj,
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content_object_repr=str(self.obj),
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resource=resource,
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allocated=resource.default_allocation
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)
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self.obj.__resource_cache[attr] = rdata
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return rdata
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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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# Clean previous state
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for related in Resource._related:
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try:
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delattr(related, 'resource_set')
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delattr(related, 'resources')
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except AttributeError:
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pass
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else:
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related._meta.virtual_fields = [
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field for field in related._meta.virtual_fields if field.rel.to != ResourceData
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]
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for ct, resources in Resource.objects.group_by('content_type').items():
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model = ct.model_class()
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relation = GenericRelation('resources.ResourceData')
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model.add_to_class('resource_set', relation)
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model.resources = ResourceHandler()
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Resource._related.add(model)
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