Synnefo

# Copyright 2011-2012 GRNET S.A. All rights reserved.

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import datetime

from copy import deepcopy

from django.conf import settings

from django.db import models

from django.db import IntegrityError

from contextlib import contextmanager

from hashlib import sha1

from snf_django.lib.api import faults

from django.conf import settings as snf_settings

from synnefo.db.managers import ForUpdateManager, ProtectedDeleteManager

from synnefo.db import pools

from synnefo.db.models import VirtualMachine, QuotaHolderSerial

from synnefo.logic.rapi_pool import (get_rapi_client,

                                     put_rapi_client)

import logging

log = logging.getLogger(__name__)

class Network(models.Model):

    OPER_STATES = (

        ('PENDING', 'Pending'),  # Unused because of lazy networks

        ('ACTIVE', 'Active'),

        ('DELETED', 'Deleted'),

        ('ERROR', 'Error')

    )

    ACTIONS = (

        ('CREATE', 'Create Network'),

        ('DESTROY', 'Destroy Network'),

        ('ADD', 'Add server to Network'),

        ('REMOVE', 'Remove server from Network'),

    )

    RSAPI_STATE_FROM_OPER_STATE = {

        'PENDING': 'PENDING',

        'ACTIVE': 'ACTIVE',

        'DELETED': 'DELETED',

        'ERROR': 'ERROR'

    }

    FLAVORS = {

        'CUSTOM': {

            'mode': 'bridged',

            'link': settings.DEFAULT_BRIDGE,

            'mac_prefix': settings.DEFAULT_MAC_PREFIX,

            'tags': None,

            'desc': "Basic flavor used for a bridged network",

        },

        'IP_LESS_ROUTED': {

            '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",

        },

        'MAC_FILTERED': {

            '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)",

        },

        'PHYSICAL_VLAN': {

            '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",

        },

    }

    name = models.CharField('Network Name', max_length=128)

    userid = models.CharField('User ID of the owner', max_length=128,

                              null=True, db_index=True)

    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)

    mac_prefix = models.CharField('MAC Prefix', max_length=32, null=False)

    tags = models.CharField('Network Tags', max_length=128, null=True)

    public = models.BooleanField(default=False, db_index=True)

    created = models.DateTimeField(auto_now_add=True)

    updated = models.DateTimeField(auto_now=True)

    deleted = models.BooleanField('Deleted', default=False, db_index=True)

    state = models.CharField(choices=OPER_STATES, max_length=32,

                             default='PENDING')

    machines = models.ManyToManyField(VirtualMachine,

                                      through='NetworkInterface',

                                      related_name='neutron_machines')

    action = models.CharField(choices=ACTIONS, max_length=32, null=True,

                              default=None)

    drained = models.BooleanField("Drained", default=False, null=False)

    # this is the opposite of admin_state_up

    floating_ip_pool = models.BooleanField('Floating IP Pool', null=False,

                                           default=False)

    #serial = models.ForeignKey(QuotaHolderSerial, related_name='network',

    #                           null=True)

    objects = ForUpdateManager()

    def __unicode__(self):

        return "<Network: %s>" % str(self.id)

    @property

    def backend_id(self):

        """Return the backend id by prepending backend-prefix."""

        if not self.id:

            raise Network.InvalidBackendIdError("self.id is None")

        return "%snet-%s" % (settings.BACKEND_PREFIX_ID, str(self.id))

    @property

    def backend_tag(self):

        """Return the network tag to be used in backend

        """

        if self.tags:

            return self.tags.split(',')

        else:

            return []

    def create_backend_network(self, backend=None):

        """Create corresponding BackendNetwork entries."""

        backends = [backend] if backend else\

            Backend.objects.filter(offline=False)

        for backend in backends:

            backend_exists =\

                BackendNetwork.objects.filter(backend=backend, network=self)\

                                      .exists()

            if not backend_exists:

                BackendNetwork.objects.create(backend=backend, network=self)

    def get_pool(self, with_lock=True):

        if not self.pool_id:

            self.pool = IPPoolTable.objects.create(available_map='',

                                                   reserved_map='',

                                                   size=0)

            self.save()

        objects = IPPoolTable.objects

        if with_lock:

            objects = objects.select_for_update()

        return objects.get(id=self.pool_id).pool

    def reserve_address(self, address):

        pool = self.get_pool()

        pool.reserve(address)

        pool.save()

    def release_address(self, address):

        pool = self.get_pool()

        pool.put(address)

        pool.save()

    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))

class Subnet(models.Model):

    SUBNET_NAME_LENGTH = 128

    network = models.ForeignKey('Network')

    name = models.CharField('Network Name', max_length=SUBNET_NAME_LENGTH,

                            null=True)

    ipversion = models.IntegerField('IP Version', default=4)

    cidr = models.CharField('Subnet', max_length=32, null=True)

    gateway = models.CharField('Gateway', max_length=32, null=True)

    dhcp = models.BooleanField('DHCP', default=True)

    # Synnefo related fields

    # subnet6 will be null for IPv4 only networks

    #pool = models.OneToOneField('IPPoolTable', related_name='network',

    #                            default=lambda: IPPoolTable.objects.create(

    #                                                        available_map='',

    #                                                        reserved_map='',

    #                                                        size=0),

    #                           null=True)

    def __unicode__(self):

        return "<Subnet %s>" % str(self.id)

class NetworkInterface(models.Model):

    STATES = (

        ("ACTIVE", "Active"),

        ("BUILDING", "Building"),

    )

    name = models.CharField('Network Name', max_length=128)

    machine = models.ForeignKey(VirtualMachine, related_name='neutron_nics')

    network = models.ForeignKey(Network, related_name='neutron_nics')

    created = models.DateTimeField(auto_now_add=True)

    updated = models.DateTimeField(auto_now=True)

    index = models.IntegerField(null=True)

    mac = models.CharField(max_length=32, null=True, unique=True)

    ipv4 = models.CharField(max_length=15, null=True)

    ipv6 = models.CharField(max_length=100, null=True)

    #firewall_profile = models.CharField(choices=FIREWALL_PROFILES,

    #                                    max_length=30, null=True)

    dirty = models.BooleanField(default=False)

    state = models.CharField(max_length=32, null=False, default="ACTIVE",

                             choices=STATES)

    admin_state_up = models.BooleanField(default=False, db_index=True)

    def __unicode__(self):

        return "<%s:vm:%s network:%s ipv4:%s ipv6:%s>" % \

            (self.index, self.machine_id, self.network_id, self.ipv4,

             self.ipv6)

    @property

    def is_floating_ip(self):

        network = self.network

        if self.ipv4 and network.floating_ip_pool:

            return network.floating_ips.filter(machine=self.machine,

                                               ipv4=self.ipv4,

                                               deleted=False).exists()