planetstack/core/models/network.py

   1 import os
   2 import socket
   3 from django.db import models
   4 from core.models import PlCoreBase, Site, Slice, Sliver
   5 from django.contrib.contenttypes.models import ContentType
   6 from django.contrib.contenttypes import generic
   7
   8 # Create your models here.
   9
  10 SUBNET_BASE = "10.0.0.0"
  11 SUBNET_NODE_BITS = 12     # enough for 4096 bits per subnet
  12 SUBNET_SUBNET_BITS = 12   # enough for 4096 private networks
  13
  14 def find_unused_subnet(base, subnet_bits, node_bits, existing_subnets):
  15     i=0
  16     while True:
  17         subnet_i = (i<<node_bits) | int(socket.inet_aton(base).encode('hex'),16)
  18         subnet = socket.inet_ntoa(hex(subnet_i)[2:].zfill(8).decode('hex')) + "/" + str(32-node_bits)
  19         if (subnet not in existing_subnets):
  20             return subnet
  21         i=i+1
  22
  23 class NetworkTemplate(PlCoreBase):
  24     VISIBILITY_CHOICES = (('public', 'public'), ('private', 'private'))
  25
  26     name = models.CharField(max_length=32)
  27     guaranteedBandwidth = models.IntegerField(default=0)
  28     visibility = models.CharField(max_length=30, choices=VISIBILITY_CHOICES, default="private")
  29
  30     def __unicode__(self):  return u'%s' % (self.name)
  31
  32 class Network(PlCoreBase):
  33     name = models.CharField(max_length=32)
  34     template = models.ForeignKey(NetworkTemplate)
  35     subnet = models.CharField(max_length=32, blank=True, null=True)
  36     ports = models.CharField(max_length=1024)
  37     labels = models.CharField(max_length=1024)
  38     slice = models.ForeignKey(Slice, related_name="networks")
  39
  40     guaranteedBandwidth = models.IntegerField(default=0)
  41     permittedSlices = models.ManyToManyField(Slice, blank=True, related_name="permittedNetworks")
  42     boundSlivers = models.ManyToManyField(Sliver, blank=True, related_name="boundNetworks", through="NetworkSliver")
  43
  44     def __unicode__(self):  return u'%s' % (self.name)
  45
  46     def allocateSubnet(self):
  47         existingSubnets = [x.subnet for x in Network.objects.all()]
  48         return find_unused_subnet(SUBNET_BASE, SUBNET_SUBNET_BITS, SUBNET_NODE_BITS, existingSubnets)
  49
  50     def save(self, *args, **kwds):
  51         if not self.subnet:
  52             self.subnet = self.allocateSubnet()
  53         super(Network, self).save(*args, **kwds)
  54
  55 class NetworkSliver(PlCoreBase):
  56     network = models.ForeignKey(Network)
  57     sliver = models.ForeignKey(Sliver)
  58     ip = models.GenericIPAddressField(help_text="Sliver ip address", blank=True, null=True)
  59
  60     def __unicode__(self):  return u'foo!'
  61
  62 class Router(PlCoreBase):
  63     name = models.CharField(max_length=32)
  64     owner = models.ForeignKey(Slice, related_name="routers")
  65     networks = models.ManyToManyField(Network, blank=True, related_name="routers")
  66
  67     def __unicode__(self):  return u'%s' % (self.name)
  68
  69 class NetworkParameterType(PlCoreBase):
  70     name = models.SlugField(help_text="The name of this tag", max_length=128)
  71
  72     def __unicode__(self):  return u'%s' % (self.name)
  73
  74 class NetworkParameter(PlCoreBase):
  75     networkParameterType = models.ForeignKey(NetworkParameterType, related_name="parameters", help_text="The name of the parameter")
  76     value = models.CharField(help_text="The value of this parameter", max_length=1024)
  77
  78     # The required fields to do a ObjectType lookup, and object_id assignment
  79     content_type = models.ForeignKey(ContentType)
  80     object_id = models.PositiveIntegerField()
  81     content_object = generic.GenericForeignKey('content_type', 'object_id')
  82
  83     def __unicode__(self):
  84         return self.networkParameterType.name
  85
  86