import copy import socket from django.contrib.contenttypes import generic from django.contrib.contenttypes.models import ContentType from django.db import models from django.utils.module_loading import autodiscover_modules from django.utils.translation import ugettext_lazy as _ from orchestra.core.validators import validate_ip_address, ValidationError from orchestra.models.fields import NullableCharField #from orchestra.utils.apps import autodiscover from . import settings from .backends import ServiceBackend class Server(models.Model): """ Machine runing daemons (services) """ name = models.CharField(_("name"), max_length=256, unique=True) address = NullableCharField(_("address"), max_length=256, blank=True, null=True, unique=True, help_text=_("IP address or domain name")) description = models.TextField(_("description"), blank=True) os = models.CharField(_("operative system"), max_length=32, choices=settings.ORCHESTRATION_OS_CHOICES, default=settings.ORCHESTRATION_DEFAULT_OS) def __unicode__(self): 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 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' 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, default=RECEIVED) server = models.ForeignKey(Server, verbose_name=_("server"), related_name='execution_logs') script = models.TextField(_("script")) stdout = models.TextField(_("stdout")) stderr = models.TextField(_("stdin")) 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, help_text="Celery task ID when used as execution backend") created_at = models.DateTimeField(_("created"), auto_now_add=True) updated_at = models.DateTimeField(_("updated"), auto_now=True) class Meta: get_latest_by = 'id' def __unicode__(self): return "%s@%s" % (self.backend, self.server) @property def execution_time(self): return (self.updated_at-self.created_at).total_seconds() def backend_class(self): return ServiceBackend.get_backend(self.backend) class BackendOperation(models.Model): """ Encapsulates an operation, storing its related object, the action and the backend. """ DELETE = 'delete' SAVE = 'save' MONITOR = 'monitor' EXCEEDED = 'exceeded' RECOVERY = 'recovery' log = models.ForeignKey('orchestration.BackendLog', related_name='operations') backend = models.CharField(_("backend"), max_length=256) action = models.CharField(_("action"), max_length=64) content_type = models.ForeignKey(ContentType) object_id = models.PositiveIntegerField() instance = generic.GenericForeignKey('content_type', 'object_id') class Meta: verbose_name = _("Operation") verbose_name_plural = _("Operations") def __unicode__(self): return '%s.%s(%s)' % (self.backend, self.action, self.instance) def __hash__(self): """ set() """ backend = getattr(self, 'backend', self.backend) return hash(backend) + hash(self.instance) + hash(self.action) def __eq__(self, operation): """ set() """ return hash(self) == hash(operation) @classmethod def create(cls, backend, instance, action, servers=None): op = cls(backend=backend.get_name(), instance=instance, action=action) op.backend = backend # instance should maintain any dynamic attribute until backend execution # deep copy is prefered over copy otherwise objects will share same atributes (queryset cache) op.instance = copy.deepcopy(instance) op.servers = servers return op @classmethod def execute(cls, operations, async=False): from . import manager scripts, block = manager.generate(operations) return manager.execute(scripts, block=block, async=async) @classmethod def execute_action(cls, instance, action): backends = ServiceBackend.get_backends(instance=instance, action=action) operations = [cls.create(backend_cls, instance, action) for backend_cls in backends] return cls.execute(operations) def preload_context(self): """ Heuristic Running get_context will prevent most of related objects do not exist errors """ if self.action == self.DELETE: if hasattr(self.backend, 'get_context'): self.backend().get_context(self.instance) def backend_class(self): return ServiceBackend.get_backend(self.backend) autodiscover_modules('backends') class Route(models.Model): """ Defines the routing that determine in which server a backend is executed """ backend = models.CharField(_("backend"), max_length=256, choices=ServiceBackend.get_choices()) host = models.ForeignKey(Server, verbose_name=_("host")) match = models.CharField(_("match"), max_length=256, blank=True, default='True', help_text=_("Python expression used for selecting the targe host, " "instance referes to the current object.")) # async = models.BooleanField(default=False) # method = models.CharField(_("method"), max_lenght=32, choices=method_choices, # default=MethodBackend.get_default()) is_active = models.BooleanField(_("active"), default=True) class Meta: unique_together = ('backend', 'host') def __unicode__(self): return "%s@%s" % (self.backend, self.host) @property def backend_class(self): return ServiceBackend.get_backend(self.backend) @classmethod def get_servers(cls, operation, **kwargs): cache = kwargs.get('cache', {}) servers = [] backend_cls = operation.backend key = (backend_cls.get_name(), operation.action) try: routes = cache[key] except KeyError: cache[key] = [] for route in cls.objects.filter(is_active=True, backend=backend_cls.get_name()): for action in backend_cls.get_actions(): _key = (route.backend, action) try: cache[_key].append(route) except KeyError: cache[_key] = [route] routes = cache[key] for route in routes: if route.matches(operation.instance): servers.append(route.host) return servers def clean(self): if not self.match: self.match = 'True' if self.backend: backend_model = self.backend_class.model try: obj = backend_model.objects.all()[0] except IndexError: return try: bool(self.matches(obj)) except Exception as exception: name = type(exception).__name__ message = exception.message raise ValidationError(': '.join((name, message))) def matches(self, instance): safe_locals = { 'instance': instance, 'obj': instance, instance._meta.model_name: instance, } return eval(self.match, safe_locals) def enable(self): self.is_active = True self.save() def disable(self): self.is_active = False self.save()