django-orchestra/orchestra/contrib/orchestration/models.py

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import socket
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from django.contrib.contenttypes import generic
from django.contrib.contenttypes.models import ContentType
from django.db import models
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from django.utils.functional import cached_property
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from django.utils.module_loading import autodiscover_modules
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from django.utils.translation import ugettext_lazy as _
from orchestra.core.validators import validate_ip_address, ValidationError
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from orchestra.models.fields import NullableCharField
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#from orchestra.utils.apps import autodiscover
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from . import settings
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from .backends import ServiceBackend
class Server(models.Model):
""" Machine runing daemons (services) """
name = models.CharField(_("name"), max_length=256, unique=True)
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address = NullableCharField(_("address"), max_length=256, blank=True,
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null=True, unique=True, help_text=_("IP address or domain name"))
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description = models.TextField(_("description"), blank=True)
os = models.CharField(_("operative system"), max_length=32,
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choices=settings.ORCHESTRATION_OS_CHOICES,
default=settings.ORCHESTRATION_DEFAULT_OS)
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def __str__(self):
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return self.name
def get_address(self):
if self.address:
return self.address
return self.name
def get_ip(self):
if self.address:
return self.address
try:
validate_ip_address(self.name)
except ValidationError:
return socket.gethostbyname(self.name)
else:
return self.name
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class BackendLog(models.Model):
RECEIVED = 'RECEIVED'
TIMEOUT = 'TIMEOUT'
STARTED = 'STARTED'
SUCCESS = 'SUCCESS'
FAILURE = 'FAILURE'
ERROR = 'ERROR'
REVOKED = 'REVOKED'
# Special state for mocked backendlogs
EXCEPTION = 'EXCEPTION'
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STATES = (
(RECEIVED, RECEIVED),
(TIMEOUT, TIMEOUT),
(STARTED, STARTED),
(SUCCESS, SUCCESS),
(FAILURE, FAILURE),
(ERROR, ERROR),
(REVOKED, REVOKED),
)
backend = models.CharField(_("backend"), max_length=256)
state = models.CharField(_("state"), max_length=16, choices=STATES,
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default=RECEIVED)
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server = models.ForeignKey(Server, verbose_name=_("server"),
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related_name='execution_logs')
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script = models.TextField(_("script"))
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stdout = models.TextField(_("stdout"))
stderr = models.TextField(_("stdin"))
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traceback = models.TextField(_("traceback"))
exit_code = models.IntegerField(_("exit code"), null=True)
task_id = models.CharField(_("task ID"), max_length=36, unique=True, null=True,
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help_text="Celery task ID when used as execution backend")
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created_at = models.DateTimeField(_("created"), auto_now_add=True)
updated_at = models.DateTimeField(_("updated"), auto_now=True)
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class Meta:
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get_latest_by = 'id'
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def __str__(self):
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return "%s@%s" % (self.backend, self.server)
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@property
def execution_time(self):
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return (self.updated_at-self.created_at).total_seconds()
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def backend_class(self):
return ServiceBackend.get_backend(self.backend)
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class BackendOperation(models.Model):
"""
Encapsulates an operation, storing its related object, the action and the backend.
"""
log = models.ForeignKey('orchestration.BackendLog', related_name='operations')
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backend = models.CharField(_("backend"), max_length=256)
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action = models.CharField(_("action"), max_length=64)
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content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
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instance = generic.GenericForeignKey('content_type', 'object_id')
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class Meta:
verbose_name = _("Operation")
verbose_name_plural = _("Operations")
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def __str__(self):
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return '%s.%s(%s)' % (self.backend, self.action, self.instance)
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@cached_property
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def backend_class(self):
return ServiceBackend.get_backend(self.backend)
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autodiscover_modules('backends')
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class Route(models.Model):
"""
Defines the routing that determine in which server a backend is executed
"""
backend = models.CharField(_("backend"), max_length=256,
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choices=ServiceBackend.get_choices())
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host = models.ForeignKey(Server, verbose_name=_("host"))
match = models.CharField(_("match"), max_length=256, blank=True, default='True',
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help_text=_("Python expression used for selecting the targe host, "
"<em>instance</em> referes to the current object."))
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# async = models.BooleanField(default=False)
# method = models.CharField(_("method"), max_lenght=32, choices=method_choices,
# default=MethodBackend.get_default())
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is_active = models.BooleanField(_("active"), default=True)
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class Meta:
unique_together = ('backend', 'host')
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def __str__(self):
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return "%s@%s" % (self.backend, self.host)
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@cached_property
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def backend_class(self):
return ServiceBackend.get_backend(self.backend)
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@classmethod
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def get_servers(cls, operation, **kwargs):
cache = kwargs.get('cache', {})
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servers = []
backend_cls = operation.backend
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key = (backend_cls.get_name(), operation.action)
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try:
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routes = cache[key]
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except KeyError:
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cache[key] = []
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for route in cls.objects.filter(is_active=True, backend=backend_cls.get_name()):
for action in backend_cls.get_actions():
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_key = (route.backend, action)
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try:
cache[_key].append(route)
except KeyError:
cache[_key] = [route]
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routes = cache[key]
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for route in routes:
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if route.matches(operation.instance):
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servers.append(route.host)
return servers
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@classmethod
def get_active_backends(cls):
return cls.objects.filter(is_active=True).values_list('backend', flat=True)
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def clean(self):
if not self.match:
self.match = 'True'
if self.backend:
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backend_model = self.backend_class.model_class()
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try:
obj = backend_model.objects.all()[0]
except IndexError:
return
try:
bool(self.matches(obj))
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except Exception as exception:
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name = type(exception).__name__
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raise ValidationError(': '.join((name, exception)))
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def matches(self, instance):
safe_locals = {
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'instance': instance,
'obj': instance,
instance._meta.model_name: instance,
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}
return eval(self.match, safe_locals)
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def enable(self):
self.is_active = True
self.save()
def disable(self):
self.is_active = False
self.save()