266 lines
9.4 KiB
Python
266 lines
9.4 KiB
Python
import logging
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import socket
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from django.contrib.contenttypes.fields import GenericForeignKey
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from django.contrib.contenttypes.models import ContentType
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.utils.encoding import force_text
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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 _
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from orchestra.core.validators import validate_ip_address, validate_hostname, OrValidator
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from orchestra.models.fields import NullableCharField, MultiSelectField
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from . import settings
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from .backends import ServiceBackend
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logger = logging.getLogger(__name__)
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class Server(models.Model):
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""" Machine runing daemons (services) """
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name = models.CharField(_("name"), max_length=256, unique=True,
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help_text=_("Verbose name or hostname of this server."))
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address = NullableCharField(_("address"), max_length=256, blank=True,
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validators=[OrValidator(validate_ip_address, validate_hostname)],
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null=True, unique=True, help_text=_(
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"Optional IP address or domain name. If blank, name field will be used for address resolution.<br>"
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"If the IP address never changes you can set this field and save DNS requests."))
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description = models.TextField(_("description"), blank=True)
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os = models.CharField(_("operative system"), max_length=32,
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choices=settings.ORCHESTRATION_OS_CHOICES,
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default=settings.ORCHESTRATION_DEFAULT_OS)
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def __str__(self):
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return self.name or str(self.address)
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def get_address(self):
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if self.address:
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return self.address
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return self.name
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def get_ip(self):
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address = self.get_address()
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try:
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return validate_ip_address(address)
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except ValidationError:
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return socket.gethostbyname(self.name)
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def clean(self):
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self.name = self.name.strip()
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self.address = self.address.strip()
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if self.name and not self.address:
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validate = OrValidator(validate_ip_address, validate_hostname)
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validate_hostname(self.name)
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try:
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validate(self.name)
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except ValidationError as err:
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raise ValidationError({
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'name': _("Name should be a valid hostname or IP address when address is not provided.")
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})
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class BackendLog(models.Model):
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RECEIVED = 'RECEIVED'
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TIMEOUT = 'TIMEOUT'
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STARTED = 'STARTED'
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SUCCESS = 'SUCCESS'
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FAILURE = 'FAILURE'
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ERROR = 'ERROR'
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REVOKED = 'REVOKED'
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ABORTED = 'ABORTED'
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NOTHING = 'NOTHING'
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# Special state for mocked backendlogs
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EXCEPTION = 'EXCEPTION'
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STATES = (
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(RECEIVED, RECEIVED),
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(TIMEOUT, TIMEOUT),
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(STARTED, STARTED),
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(SUCCESS, SUCCESS),
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(FAILURE, FAILURE),
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(ERROR, ERROR),
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(ABORTED, ABORTED),
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(REVOKED, REVOKED),
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(NOTHING, NOTHING),
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)
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backend = models.CharField(_("backend"), max_length=256)
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state = models.CharField(_("state"), max_length=16, choices=STATES, default=RECEIVED)
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server = models.ForeignKey(Server, verbose_name=_("server"), related_name='execution_logs')
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script = models.TextField(_("script"))
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stdout = models.TextField(_("stdout"))
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stderr = models.TextField(_("stderr"))
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traceback = models.TextField(_("traceback"))
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exit_code = models.IntegerField(_("exit code"), null=True)
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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, db_index=True)
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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
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def execution_time(self):
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return (self.updated_at-self.created_at).total_seconds()
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@property
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def has_finished(self):
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return self.state not in (self.STARTED, self.RECEIVED)
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@property
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def is_success(self):
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return self.state in (self.SUCCESS, self.NOTHING)
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def backend_class(self):
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return ServiceBackend.get_backend(self.backend)
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class BackendOperationQuerySet(models.QuerySet):
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def create(self, **kwargs):
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instance = kwargs.get('instance')
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if instance and 'instance_repr' not in kwargs:
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kwargs['instance_repr'] = force_text(instance)[:256]
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return super(BackendOperationQuerySet, self).create(**kwargs)
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class BackendOperation(models.Model):
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"""
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Encapsulates an operation, storing its related object, the action and the backend.
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"""
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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)
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object_id = models.PositiveIntegerField(null=True)
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instance_repr = models.CharField(_("instance representation"), max_length=256)
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instance = GenericForeignKey('content_type', 'object_id')
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objects = BackendOperationQuerySet.as_manager()
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class Meta:
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verbose_name = _("Operation")
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verbose_name_plural = _("Operations")
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index_together = (
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('content_type', 'object_id'),
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)
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def __str__(self):
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return '%s.%s(%s)' % (self.backend, self.action, self.instance or self.instance_repr)
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@cached_property
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def backend_class(self):
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return ServiceBackend.get_backend(self.backend)
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autodiscover_modules('backends')
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class RouteQuerySet(models.QuerySet):
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def get_for_operation(self, operation, **kwargs):
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cache = kwargs.get('cache', {})
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if not cache:
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for route in self.filter(is_active=True).select_related('host'):
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try:
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backend_class = route.backend_class
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except KeyError:
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logger.warning("Backed '%s' not installed." % route.backend)
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else:
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for action in backend_class.get_actions():
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key = (route.backend, action)
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try:
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cache[key].append(route)
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except KeyError:
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cache[key] = [route]
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routes = []
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backend_cls = operation.backend
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key = (backend_cls.get_name(), operation.action)
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try:
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target_routes = cache[key]
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except KeyError:
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pass
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else:
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for route in target_routes:
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if route.matches(operation.instance):
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routes.append(route)
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return routes
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class Route(models.Model):
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"""
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Defines the routing that determine in which server a backend is executed
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"""
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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"), related_name='routes')
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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, "
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"<em>instance</em> referes to the current object."))
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async = models.BooleanField(default=False,
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help_text=_("Whether or not block the request/response cycle waitting this backend to "
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"finish its execution. Usually you want slave servers to run asynchronously."))
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async_actions = MultiSelectField(max_length=256, blank=True,
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help_text=_("Specify individual actions to be executed asynchronoulsy."))
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# method = models.CharField(_("method"), max_lenght=32, choices=method_choices,
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# default=MethodBackend.get_default())
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is_active = models.BooleanField(_("active"), default=True)
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objects = RouteQuerySet.as_manager()
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class Meta:
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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):
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return ServiceBackend.get_backend(self.backend)
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def clean(self):
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if not self.match:
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self.match = 'True'
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if self.backend:
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try:
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backend_class = self.backend_class
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except KeyError:
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raise ValidationError({
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'backend': _("Backend '%s' is not installed.") % self.backend
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})
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backend_model = backend_class.model_class()
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try:
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obj = backend_model.objects.all()[0]
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except IndexError:
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return
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try:
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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, str(exception))))
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def action_is_async(self, action):
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return action in self.async_actions
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def matches(self, instance):
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safe_locals = {
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'instance': instance,
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'obj': instance,
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instance._meta.model_name: instance,
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}
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return eval(self.match, safe_locals)
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def enable(self):
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self.is_active = True
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self.save()
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def disable(self):
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self.is_active = False
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self.save()
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