models.py 32.4 KB
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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
#   1. Redistributions of source code must retain the above copyright
#      notice, this list of conditions and the following disclaimer.
#
#  2. Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of GRNET S.A.

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import datetime

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from copy import deepcopy
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from django.conf import settings
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from django.db import models
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import utils
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from contextlib import contextmanager
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from hashlib import sha1
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from snf_django.lib.api import faults
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from django.conf import settings as snf_settings
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from aes_encrypt import encrypt_db_charfield, decrypt_db_charfield
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from synnefo.db import pools, fields
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from synnefo.logic.rapi_pool import (get_rapi_client,
                                     put_rapi_client)
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import logging
log = logging.getLogger(__name__)

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class Flavor(models.Model):
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    cpu = models.IntegerField('Number of CPUs', default=0)
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    ram = models.IntegerField('RAM size in MiB', default=0)
    disk = models.IntegerField('Disk size in GiB', default=0)
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    disk_template = models.CharField('Disk template', max_length=32)
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    deleted = models.BooleanField('Deleted', default=False)
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    class Meta:
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        verbose_name = u'Virtual machine flavor'
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        unique_together = ('cpu', 'ram', 'disk', 'disk_template')
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    @property
    def name(self):
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        """Returns flavor name (generated)"""
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        return u'C%dR%dD%d%s' % (self.cpu, self.ram, self.disk,
                                 self.disk_template)
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    def __unicode__(self):
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        return "<%s:%s>" % (str(self.id), self.name)
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class Backend(models.Model):
    clustername = models.CharField('Cluster Name', max_length=128, unique=True)
    port = models.PositiveIntegerField('Port', default=5080)
    username = models.CharField('Username', max_length=64, blank=True,
                                null=True)
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    password_hash = models.CharField('Password', max_length=128, blank=True,
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                                     null=True)
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    # Sha1 is up to 40 characters long
    hash = models.CharField('Hash', max_length=40, editable=False, null=False)
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    # Unique index of the Backend, used for the mac-prefixes of the
    # BackendNetworks
    index = models.PositiveIntegerField('Index', null=False, unique=True,
                                        default=0)
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    drained = models.BooleanField('Drained', default=False, null=False)
    offline = models.BooleanField('Offline', default=False, null=False)
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    # Type of hypervisor
    hypervisor = models.CharField('Hypervisor', max_length=32, default="kvm",
                                  null=False)
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    disk_templates = fields.SeparatedValuesField("Disk Templates", null=True)
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    # Last refresh of backend resources
    updated = models.DateTimeField(auto_now_add=True)
    # Backend resources
    mfree = models.PositiveIntegerField('Free Memory', default=0, null=False)
    mtotal = models.PositiveIntegerField('Total Memory', default=0, null=False)
    dfree = models.PositiveIntegerField('Free Disk', default=0, null=False)
    dtotal = models.PositiveIntegerField('Total Disk', default=0, null=False)
    pinst_cnt = models.PositiveIntegerField('Primary Instances', default=0,
                                            null=False)
    ctotal = models.PositiveIntegerField('Total number of logical processors',
                                         default=0, null=False)

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    HYPERVISORS = (
        ("kvm", "Linux KVM hypervisor"),
        ("xen-pvm", "Xen PVM hypervisor"),
        ("xen-hvm", "Xen KVM hypervisor"),
    )

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    class Meta:
        verbose_name = u'Backend'
        ordering = ["clustername"]

    def __unicode__(self):
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        return self.clustername + "(id=" + str(self.id) + ")"
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    @property
    def backend_id(self):
        return self.id

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    def get_client(self):
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        """Get or create a client. """
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        if self.offline:
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            raise faults.ServiceUnavailable
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        return get_rapi_client(self.id, self.hash,
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                               self.clustername,
                               self.port,
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                               self.username,
                               self.password)

    @staticmethod
    def put_client(client):
            put_rapi_client(client)
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    def create_hash(self):
        """Create a hash for this backend. """
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        sha = sha1('%s%s%s%s' %
                   (self.clustername, self.port, self.username, self.password))
        return sha.hexdigest()
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    @property
    def password(self):
        return decrypt_db_charfield(self.password_hash)

    @password.setter
    def password(self, value):
        self.password_hash = encrypt_db_charfield(value)

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    def save(self, *args, **kwargs):
        # Create a new hash each time a Backend is saved
        old_hash = self.hash
        self.hash = self.create_hash()
        super(Backend, self).save(*args, **kwargs)
        if self.hash != old_hash:
            # Populate the new hash to the new instances
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            self.virtual_machines.filter(deleted=False)\
                                 .update(backend_hash=self.hash)
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    def __init__(self, *args, **kwargs):
        super(Backend, self).__init__(*args, **kwargs)
        if not self.pk:
            # Generate a unique index for the Backend
            indexes = Backend.objects.all().values_list('index', flat=True)
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            try:
                first_free = [x for x in xrange(0, 16) if x not in indexes][0]
                self.index = first_free
            except IndexError:
                raise Exception("Can not create more than 16 backends")
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    def use_hotplug(self):
        return self.hypervisor == "kvm" and snf_settings.GANETI_USE_HOTPLUG

    def get_create_params(self):
        params = deepcopy(snf_settings.GANETI_CREATEINSTANCE_KWARGS)
        params["hvparams"] = params.get("hvparams", {})\
                                   .get(self.hypervisor, {})
        return params

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# A backend job may be in one of the following possible states
BACKEND_STATUSES = (
    ('queued', 'request queued'),
    ('waiting', 'request waiting for locks'),
    ('canceling', 'request being canceled'),
    ('running', 'request running'),
    ('canceled', 'request canceled'),
    ('success', 'request completed successfully'),
    ('error', 'request returned error')
)


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class QuotaHolderSerial(models.Model):
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    """Model representing a serial for a Quotaholder Commission.

    serial:   The serial that Quotaholder assigned to this commission
    pending:  Whether it has been decided to accept or reject this commission
    accept:   If pending is False, this attribute indicates whether to accept
              or reject this commission
    resolved: Whether this commission has been accepted or rejected to
              Quotaholder.

    """
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    serial = models.BigIntegerField(null=False, primary_key=True,
                                    db_index=True)
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    pending = models.BooleanField(default=True, db_index=True)
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    accept = models.BooleanField(default=False)
    resolved = models.BooleanField(default=False)
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    class Meta:
        verbose_name = u'Quota Serial'
        ordering = ["serial"]

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    def __unicode__(self):
        return u"<serial: %s>" % self.serial

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class VirtualMachine(models.Model):
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    # The list of possible actions for a VM
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    ACTIONS = (
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        ('CREATE', 'Create VM'),
        ('START', 'Start VM'),
        ('STOP', 'Shutdown VM'),
        ('SUSPEND', 'Admin Suspend VM'),
        ('REBOOT', 'Reboot VM'),
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        ('DESTROY', 'Destroy VM'),
        ('RESIZE', 'Resize a VM'),
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        ('ADDFLOATINGIP', 'Add floating IP to VM'),
        ('REMOVEFLOATINGIP', 'Add floating IP to VM'),
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    )
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    # The internal operating state of a VM
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    OPER_STATES = (
        ('BUILD', 'Queued for creation'),
        ('ERROR', 'Creation failed'),
        ('STOPPED', 'Stopped'),
        ('STARTED', 'Started'),
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        ('DESTROYED', 'Destroyed'),
        ('RESIZE', 'Resizing')
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    )
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    # The list of possible operations on the backend
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    BACKEND_OPCODES = (
        ('OP_INSTANCE_CREATE', 'Create Instance'),
        ('OP_INSTANCE_REMOVE', 'Remove Instance'),
        ('OP_INSTANCE_STARTUP', 'Startup Instance'),
        ('OP_INSTANCE_SHUTDOWN', 'Shutdown Instance'),
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        ('OP_INSTANCE_REBOOT', 'Reboot Instance'),

        # These are listed here for completeness,
        # and are ignored for the time being
        ('OP_INSTANCE_SET_PARAMS', 'Set Instance Parameters'),
        ('OP_INSTANCE_QUERY_DATA', 'Query Instance Data'),
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        ('OP_INSTANCE_REINSTALL', 'Reinstall Instance'),
        ('OP_INSTANCE_ACTIVATE_DISKS', 'Activate Disks'),
        ('OP_INSTANCE_DEACTIVATE_DISKS', 'Deactivate Disks'),
        ('OP_INSTANCE_REPLACE_DISKS', 'Replace Disks'),
        ('OP_INSTANCE_MIGRATE', 'Migrate Instance'),
        ('OP_INSTANCE_CONSOLE', 'Get Instance Console'),
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        ('OP_INSTANCE_RECREATE_DISKS', 'Recreate Disks'),
        ('OP_INSTANCE_FAILOVER', 'Failover Instance')
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    )
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    # The operating state of a VM,
    # upon the successful completion of a backend operation.
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    # IMPORTANT: Make sure all keys have a corresponding
    # entry in BACKEND_OPCODES if you update this field, see #1035, #1111.
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    OPER_STATE_FROM_OPCODE = {
        'OP_INSTANCE_CREATE': 'STARTED',
        'OP_INSTANCE_REMOVE': 'DESTROYED',
        'OP_INSTANCE_STARTUP': 'STARTED',
        'OP_INSTANCE_SHUTDOWN': 'STOPPED',
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        'OP_INSTANCE_REBOOT': 'STARTED',
        'OP_INSTANCE_SET_PARAMS': None,
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        'OP_INSTANCE_QUERY_DATA': None,
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        'OP_INSTANCE_REINSTALL': None,
        'OP_INSTANCE_ACTIVATE_DISKS': None,
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        'OP_INSTANCE_DEACTIVATE_DISKS': None,
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        'OP_INSTANCE_REPLACE_DISKS': None,
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        'OP_INSTANCE_MIGRATE': None,
        'OP_INSTANCE_CONSOLE': None,
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        'OP_INSTANCE_RECREATE_DISKS': None,
        'OP_INSTANCE_FAILOVER': None
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    }

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    # This dictionary contains the correspondence between
    # internal operating states and Server States as defined
    # by the Rackspace API.
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    RSAPI_STATE_FROM_OPER_STATE = {
        "BUILD": "BUILD",
        "ERROR": "ERROR",
        "STOPPED": "STOPPED",
        "STARTED": "ACTIVE",
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        'RESIZE': 'RESIZE',
        'DESTROYED': 'DELETED',
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    }

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    name = models.CharField('Virtual Machine Name', max_length=255)
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    userid = models.CharField('User ID of the owner', max_length=100,
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                              db_index=True, null=False)
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    backend = models.ForeignKey(Backend, null=True,
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                                related_name="virtual_machines",
                                on_delete=models.PROTECT)
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    backend_hash = models.CharField(max_length=128, null=True, editable=False)
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    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
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    imageid = models.CharField(max_length=100, null=False)
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    hostid = models.CharField(max_length=100)
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    flavor = models.ForeignKey(Flavor, on_delete=models.PROTECT)
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    deleted = models.BooleanField('Deleted', default=False, db_index=True)
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    suspended = models.BooleanField('Administratively Suspended',
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                                    default=False)
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    serial = models.ForeignKey(QuotaHolderSerial,
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                               related_name='virtual_machine', null=True,
                               on_delete=models.SET_NULL)
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    # VM State
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    # The following fields are volatile data, in the sense
    # that they need not be persistent in the DB, but rather
    # get generated at runtime by quering Ganeti and applying
    # updates received from Ganeti.
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    # In the future they could be moved to a separate caching layer
    # and removed from the database.
    # [vkoukis] after discussion with [faidon].
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    action = models.CharField(choices=ACTIONS, max_length=30, null=True,
                              default=None)
    operstate = models.CharField(choices=OPER_STATES, max_length=30,
                                 null=False, default="BUILD")
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    backendjobid = models.PositiveIntegerField(null=True)
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    backendopcode = models.CharField(choices=BACKEND_OPCODES, max_length=30,
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                                     null=True)
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    backendjobstatus = models.CharField(choices=BACKEND_STATUSES,
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                                        max_length=30, null=True)
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    backendlogmsg = models.TextField(null=True)
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    buildpercentage = models.IntegerField(default=0)
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    backendtime = models.DateTimeField(default=datetime.datetime.min)
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    # Latest action and corresponding Ganeti job ID, for actions issued
    # by the API
    task = models.CharField(max_length=64, null=True)
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    task_job_id = models.BigIntegerField(null=True)
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    def get_client(self):
        if self.backend:
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            return self.backend.get_client()
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        else:
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            raise faults.ServiceUnavailable
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    def get_last_diagnostic(self, **filters):
        try:
            return self.diagnostics.filter()[0]
        except IndexError:
            return None

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    @staticmethod
    def put_client(client):
            put_rapi_client(client)

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    def save(self, *args, **kwargs):
        # Store hash for first time saved vm
        if (self.id is None or self.backend_hash == '') and self.backend:
            self.backend_hash = self.backend.hash
        super(VirtualMachine, self).save(*args, **kwargs)

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    @property
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    def backend_vm_id(self):
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        """Returns the backend id for this VM by prepending backend-prefix."""
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        if not self.id:
            raise VirtualMachine.InvalidBackendIdError("self.id is None")
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        return "%s%s" % (settings.BACKEND_PREFIX_ID, str(self.id))
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    class Meta:
        verbose_name = u'Virtual machine instance'
        get_latest_by = 'created'
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    def __unicode__(self):
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        return u"<vm:%s@backend:%s>" % (self.id, self.backend_id)
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    # Error classes
    class InvalidBackendIdError(Exception):
        def __init__(self, value):
            self.value = value

        def __str__(self):
            return repr(self.value)

    class InvalidBackendMsgError(Exception):
        def __init__(self, opcode, status):
            self.opcode = opcode
            self.status = status

        def __str__(self):
            return repr('<opcode: %s, status: %s>' % (self.opcode,
                        self.status))

    class InvalidActionError(Exception):
        def __init__(self, action):
            self._action = action

        def __str__(self):
            return repr(str(self._action))

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class VirtualMachineMetadata(models.Model):
    meta_key = models.CharField(max_length=50)
    meta_value = models.CharField(max_length=500)
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    vm = models.ForeignKey(VirtualMachine, related_name='metadata',
                           on_delete=models.CASCADE)
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    class Meta:
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        unique_together = (('meta_key', 'vm'),)
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        verbose_name = u'Key-value pair of metadata for a VM.'
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    def __unicode__(self):
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        return u'%s: %s' % (self.meta_key, self.meta_value)
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class Network(models.Model):
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    OPER_STATES = (
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        ('PENDING', 'Pending'),  # Unused because of lazy networks
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        ('ACTIVE', 'Active'),
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        ('DELETED', 'Deleted'),
        ('ERROR', 'Error')
    )

    ACTIONS = (
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        ('CREATE', 'Create Network'),
        ('DESTROY', 'Destroy Network'),
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        ('ADD', 'Add server to Network'),
        ('REMOVE', 'Remove server from Network'),
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    )

    RSAPI_STATE_FROM_OPER_STATE = {
        'PENDING': 'PENDING',
        'ACTIVE': 'ACTIVE',
        'DELETED': 'DELETED',
        'ERROR': 'ERROR'
    }

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    FLAVORS = {
        'CUSTOM': {
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            'mode': 'bridged',
            'link': settings.DEFAULT_BRIDGE,
            'mac_prefix': settings.DEFAULT_MAC_PREFIX,
            'tags': None,
            'desc': "Basic flavor used for a bridged network",
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        },
        'IP_LESS_ROUTED': {
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            'mode': 'routed',
            'link': settings.DEFAULT_ROUTING_TABLE,
            'mac_prefix': settings.DEFAULT_MAC_PREFIX,
            'tags': 'ip-less-routed',
            'desc': "Flavor used for an IP-less routed network using"
                    " Proxy ARP",
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        },
        'MAC_FILTERED': {
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            'mode': 'bridged',
            'link': settings.DEFAULT_MAC_FILTERED_BRIDGE,
            'mac_prefix': 'pool',
            'tags': 'private-filtered',
            'desc': "Flavor used for bridged networks that offer isolation"
                    " via filtering packets based on their src "
                    " MAC (ebtables)",
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        },
        'PHYSICAL_VLAN': {
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            'mode': 'bridged',
            'link': 'pool',
            'mac_prefix': settings.DEFAULT_MAC_PREFIX,
            'tags': 'physical-vlan',
            'desc': "Flavor used for bridged network that offer isolation"
                    " via dedicated physical vlan",
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        },
    }
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    NETWORK_NAME_LENGTH = 128

    name = models.CharField('Network Name', max_length=NETWORK_NAME_LENGTH)
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    userid = models.CharField('User ID of the owner', max_length=128,
                              null=True, db_index=True)
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    flavor = models.CharField('Flavor', max_length=32, null=False)
    mode = models.CharField('Network Mode', max_length=16, null=True)
    link = models.CharField('Network Link', max_length=32, null=True)
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    mac_prefix = models.CharField('MAC Prefix', max_length=32, null=False)
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    tags = models.CharField('Network Tags', max_length=128, null=True)
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    public = models.BooleanField(default=False, db_index=True)
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    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
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    deleted = models.BooleanField('Deleted', default=False, db_index=True)
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    state = models.CharField(choices=OPER_STATES, max_length=32,
                             default='PENDING')
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    machines = models.ManyToManyField(VirtualMachine,
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                                      through='NetworkInterface')
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    action = models.CharField(choices=ACTIONS, max_length=32, null=True,
                              default=None)
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    drained = models.BooleanField("Drained", default=False, null=False)
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    floating_ip_pool = models.BooleanField('Floating IP Pool', null=False,
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                                           default=False)
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    external_router = models.BooleanField(default=False)
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    serial = models.ForeignKey(QuotaHolderSerial, related_name='network',
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                               null=True, on_delete=models.SET_NULL)
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    def __unicode__(self):
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        return "<Network: %s>" % str(self.id)
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    @property
    def backend_id(self):
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        """Return the backend id by prepending backend-prefix."""
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        if not self.id:
            raise Network.InvalidBackendIdError("self.id is None")
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        return "%snet-%s" % (settings.BACKEND_PREFIX_ID, str(self.id))
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    @property
    def backend_tag(self):
        """Return the network tag to be used in backend

        """
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        if self.tags:
            return self.tags.split(',')
        else:
            return []
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    def create_backend_network(self, backend=None):
        """Create corresponding BackendNetwork entries."""

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        backends = [backend] if backend else\
            Backend.objects.filter(offline=False)
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        for backend in backends:
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            backend_exists =\
                BackendNetwork.objects.filter(backend=backend, network=self)\
                                      .exists()
            if not backend_exists:
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                BackendNetwork.objects.create(backend=backend, network=self)
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    def get_pool(self, with_lock=True):
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        if not self.pool_id:
            self.pool = IPPoolTable.objects.create(available_map='',
                                                   reserved_map='',
                                                   size=0)
            self.save()
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        objects = IPPoolTable.objects
        if with_lock:
            objects = objects.select_for_update()
        return objects.get(id=self.pool_id).pool
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    def reserve_address(self, address):
        pool = self.get_pool()
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        pool.reserve(address)
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        pool.save()
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    def release_address(self, address):
        pool = self.get_pool()
        pool.put(address)
        pool.save()
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    class InvalidBackendIdError(Exception):
        def __init__(self, value):
            self.value = value

        def __str__(self):
            return repr(self.value)

    class InvalidBackendMsgError(Exception):
        def __init__(self, opcode, status):
            self.opcode = opcode
            self.status = status

        def __str__(self):
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            return repr('<opcode: %s, status: %s>'
                        % (self.opcode, self.status))
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    class InvalidActionError(Exception):
        def __init__(self, action):
            self._action = action

        def __str__(self):
            return repr(str(self._action))

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class Subnet(models.Model):
    SUBNET_NAME_LENGTH = 128

    network = models.ForeignKey('Network', null=False, db_index=True,
                                related_name="subnets")
    name = models.CharField('Subnet Name', max_length=SUBNET_NAME_LENGTH,
                            null=True)
    ipversion = models.IntegerField('IP Version', default=4, null=False)
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    cidr = models.CharField('Subnet', max_length=64, null=False)
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    gateway = models.CharField('Gateway', max_length=64, null=True)
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    dhcp = models.BooleanField('DHCP', default=True, null=False)
    deleted = models.BooleanField('Deleted', default=False, db_index=True,
                                  null=False)
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    host_routes = fields.SeparatedValuesField('Host Routes', null=True)
    dns_nameservers = fields.SeparatedValuesField('DNS Nameservers', null=True)

    def __unicode__(self):
        return "<Subnet %s, Network: %s>" % (self.id, self.network_id)


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class BackendNetwork(models.Model):
    OPER_STATES = (
        ('PENDING', 'Pending'),
        ('ACTIVE', 'Active'),
        ('DELETED', 'Deleted'),
        ('ERROR', 'Error')
    )

    # The list of possible operations on the backend
    BACKEND_OPCODES = (
        ('OP_NETWORK_ADD', 'Create Network'),
        ('OP_NETWORK_CONNECT', 'Activate Network'),
        ('OP_NETWORK_DISCONNECT', 'Deactivate Network'),
        ('OP_NETWORK_REMOVE', 'Remove Network'),
        # These are listed here for completeness,
        # and are ignored for the time being
        ('OP_NETWORK_SET_PARAMS', 'Set Network Parameters'),
        ('OP_NETWORK_QUERY_DATA', 'Query Network Data')
    )

    # The operating state of a Netowork,
    # upon the successful completion of a backend operation.
    # IMPORTANT: Make sure all keys have a corresponding
    # entry in BACKEND_OPCODES if you update this field, see #1035, #1111.
    OPER_STATE_FROM_OPCODE = {
        'OP_NETWORK_ADD': 'PENDING',
        'OP_NETWORK_CONNECT': 'ACTIVE',
        'OP_NETWORK_DISCONNECT': 'PENDING',
        'OP_NETWORK_REMOVE': 'DELETED',
        'OP_NETWORK_SET_PARAMS': None,
        'OP_NETWORK_QUERY_DATA': None
    }

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    network = models.ForeignKey(Network, related_name='backend_networks',
                                on_delete=models.CASCADE)
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    backend = models.ForeignKey(Backend, related_name='networks',
                                on_delete=models.PROTECT)
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    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    deleted = models.BooleanField('Deleted', default=False)
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    mac_prefix = models.CharField('MAC Prefix', max_length=32, null=False)
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    operstate = models.CharField(choices=OPER_STATES, max_length=30,
                                 default='PENDING')
    backendjobid = models.PositiveIntegerField(null=True)
    backendopcode = models.CharField(choices=BACKEND_OPCODES, max_length=30,
                                     null=True)
    backendjobstatus = models.CharField(choices=BACKEND_STATUSES,
                                        max_length=30, null=True)
    backendlogmsg = models.TextField(null=True)
    backendtime = models.DateTimeField(null=False,
                                       default=datetime.datetime.min)

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    class Meta:
        # Ensure one entry for each network in each backend
        unique_together = (("network", "backend"))

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    def __init__(self, *args, **kwargs):
        """Initialize state for just created BackendNetwork instances."""
        super(BackendNetwork, self).__init__(*args, **kwargs)
        if not self.mac_prefix:
            # Generate the MAC prefix of the BackendNetwork, by combining
            # the Network prefix with the index of the Backend
            net_prefix = self.network.mac_prefix
            backend_suffix = hex(self.backend.index).replace('0x', '')
            mac_prefix = net_prefix + backend_suffix
            try:
                utils.validate_mac(mac_prefix + ":00:00:00")
            except utils.InvalidMacAddress:
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                raise utils.InvalidMacAddress("Invalid MAC prefix '%s'" %
                                              mac_prefix)
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            self.mac_prefix = mac_prefix

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    def __unicode__(self):
        return '<%s@%s>' % (self.network, self.backend)

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class IPAddress(models.Model):
    subnet = models.ForeignKey("Subnet", related_name="ips", null=False,
                               on_delete=models.CASCADE)
    network = models.ForeignKey(Network, related_name="ips", null=False,
                                on_delete=models.CASCADE)
    nic = models.ForeignKey("NetworkInterface", related_name="ips", null=True,
                            on_delete=models.SET_NULL)
    userid = models.CharField("UUID of the owner", max_length=128, null=False,
                              db_index=True)
    address = models.CharField("IP Address", max_length=64, null=False)
    floating_ip = models.BooleanField("Floating IP", null=False, default=False)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    deleted = models.BooleanField(default=False, null=False)

    serial = models.ForeignKey(QuotaHolderSerial,
                               related_name="ips", null=True,
                               on_delete=models.SET_NULL)

    def __unicode__(self):
        ip_type = "floating" if self.floating_ip else "static"
        return u"<IPAddress: %s, Network: %s, Subnet: %s, Type: %s>"\
               % (self.address, self.network_id, self.subnet_id, ip_type)

    def in_use(self):
        if self.machine is None:
            return False
        else:
            return (not self.machine.deleted)

    class Meta:
        unique_together = ("network", "address")


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class NetworkInterface(models.Model):
    FIREWALL_PROFILES = (
        ('ENABLED', 'Enabled'),
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        ('DISABLED', 'Disabled'),
        ('PROTECTED', 'Protected')
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    )
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    STATES = (
        ("ACTIVE", "Active"),
        ("BUILDING", "Building"),
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        ("ERROR", "Error"),
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    )

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    NETWORK_IFACE_NAME_LENGTH = 128

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    name = models.CharField('NIC name', max_length=128, null=True)
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    userid = models.CharField("UUID of the owner",
                              max_length=NETWORK_IFACE_NAME_LENGTH,
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                              null=True, db_index=True)
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    machine = models.ForeignKey(VirtualMachine, related_name='nics',
                                on_delete=models.CASCADE)
    network = models.ForeignKey(Network, related_name='nics',
                                on_delete=models.CASCADE)
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    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
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    mac = models.CharField(max_length=32, null=True, unique=True)
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                                        max_length=30, null=True)
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    security_groups = models.ManyToManyField("SecurityGroup", null=True)
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    state = models.CharField(max_length=32, null=False, default="ACTIVE",
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                             choices=STATES)
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    device_owner = models.CharField('Device owner', max_length=128, null=True)

    def __unicode__(self):
        return "<%s:vm:%s network:%s>" % (self.id, self.machine_id,
                                          self.network_id)
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    @property
    def backend_uuid(self):
        """Return the backend id by prepending backend-prefix."""
        return "%snic-%s" % (settings.BACKEND_PREFIX_ID, str(self.id))

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class SecurityGroup(models.Model):
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    SECURITY_GROUP_NAME_LENGTH = 128
    name = models.CharField('group name',
                            max_length=SECURITY_GROUP_NAME_LENGTH)
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class PoolTable(models.Model):
    available_map = models.TextField(default="", null=False)
    reserved_map = models.TextField(default="", null=False)
    size = models.IntegerField(null=False)
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    # Optional Fields
    base = models.CharField(null=True, max_length=32)
    offset = models.IntegerField(null=True)
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    class Meta:
        abstract = True

    @classmethod
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    def get_pool(cls):
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        try:
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            pool_row = cls.objects.select_for_update().get()
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            return pool_row.pool
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        except cls.DoesNotExist:
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            raise pools.EmptyPool
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    @property
    def pool(self):
        return self.manager(self)
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class BridgePoolTable(PoolTable):
    manager = pools.BridgePool
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    def __unicode__(self):
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        return u"<BridgePool id:%s>" % self.id
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class MacPrefixPoolTable(PoolTable):
    manager = pools.MacPrefixPool
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    def __unicode__(self):
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        return u"<MACPrefixPool id:%s>" % self.id
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class IPPoolTable(PoolTable):
    manager = pools.IPPool
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    subnet = models.ForeignKey('Subnet', related_name="ip_pools",
                               db_index=True, null=True)
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    def __unicode__(self):
        return u"<IPv4AdressPool, Subnet: %s>" % self.subnet_id
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@contextmanager
def pooled_rapi_client(obj):
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        if isinstance(obj, (VirtualMachine, BackendNetwork)):
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            backend = obj.backend
        else:
            backend = obj

        if backend.offline:
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            log.warning("Trying to connect with offline backend: %s", backend)
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            raise faults.ServiceUnavailable("Can not connect to offline"
                                            " backend: %s" % backend)
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        b = backend
        client = get_rapi_client(b.id, b.hash, b.clustername, b.port,
                                 b.username, b.password)
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        try:
            yield client
        finally:
            put_rapi_client(client)
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class VirtualMachineDiagnosticManager(models.Manager):
    """
    Custom manager for :class:`VirtualMachineDiagnostic` model.
    """

    # diagnostic creation helpers
    def create_for_vm(self, vm, level, message, **kwargs):
        attrs = {'machine': vm, 'level': level, 'message': message}
        attrs.update(kwargs)
        # update instance updated time
        self.create(**attrs)
        vm.save()

    def create_error(self, vm, **kwargs):
        self.create_for_vm(vm, 'ERROR', **kwargs)

    def create_debug(self, vm, **kwargs):
        self.create_for_vm(vm, 'DEBUG', **kwargs)

    def since(self, vm, created_since, **kwargs):
        return self.get_query_set().filter(vm=vm, created__gt=created_since,
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                                           **kwargs)
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class VirtualMachineDiagnostic(models.Model):
    """
    Model to store backend information messages that relate to the state of
    the virtual machine.
    """

    TYPES = (
        ('ERROR', 'Error'),
        ('WARNING', 'Warning'),
        ('INFO', 'Info'),
        ('DEBUG', 'Debug'),
    )

    objects = VirtualMachineDiagnosticManager()

    created = models.DateTimeField(auto_now_add=True)
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    machine = models.ForeignKey('VirtualMachine', related_name="diagnostics",
                                on_delete=models.CASCADE)
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    level = models.CharField(max_length=20, choices=TYPES)
    source = models.CharField(max_length=100)
    source_date = models.DateTimeField(null=True)
    message = models.CharField(max_length=255)
    details = models.TextField(null=True)

    class Meta:
        ordering = ['-created']