uncloud-mravi/uncloud_vm/models.py

198 lines
6.3 KiB
Python

import uuid
from django.db import models
from django.contrib.auth import get_user_model
from uncloud_pay.models import Product, RecurringPeriod
from uncloud.models import UncloudModel, UncloudStatus
import uncloud_pay.models as pay_models
import uncloud_storage.models
class VMCluster(UncloudModel):
uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
name = models.CharField(max_length=128, unique=True)
class VMHost(UncloudModel):
uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
# 253 is the maximum DNS name length
hostname = models.CharField(max_length=253, unique=True)
vmcluster = models.ForeignKey(
VMCluster, on_delete=models.CASCADE, editable=False, blank=True, null=True
)
# indirectly gives a maximum number of cores / VM - f.i. 32
physical_cores = models.IntegerField(default=0)
# determines the maximum usable cores - f.i. 320 if you overbook by a factor of 10
usable_cores = models.IntegerField(default=0)
# ram that can be used of the server
usable_ram_in_gb = models.FloatField(default=0)
status = models.CharField(
max_length=32, choices=UncloudStatus.choices, default=UncloudStatus.PENDING
)
@property
def vms(self):
return VMProduct.objects.filter(vmhost=self)
@property
def used_ram_in_gb(self):
return sum([vm.ram_in_gb for vm in VMProduct.objects.filter(vmhost=self)])
@property
def available_ram_in_gb(self):
return self.usable_ram_in_gb - self.used_ram_in_gb
@property
def available_cores(self):
return self.usable_cores - sum([vm.cores for vm in self.vms ])
class VMProduct(Product):
vmhost = models.ForeignKey(
VMHost, on_delete=models.CASCADE, editable=False, blank=True, null=True
)
vmcluster = models.ForeignKey(
VMCluster, on_delete=models.CASCADE, editable=False, blank=True, null=True
)
# VM-specific. The name is only intended for customers: it's a pain to
# remember IDs (speaking from experience as ungleich customer)!
name = models.CharField(max_length=32, blank=True, null=True)
cores = models.IntegerField()
ram_in_gb = models.FloatField()
# Default recurring price is PER_MONTH, see uncloud_pay.models.Product.
@property
def recurring_price(self):
return self.cores * 3 + self.ram_in_gb * 4
def __str__(self):
return "VM {} ({}): {} cores {} gb ram".format(self.uuid,
self.name,
self.cores,
self.ram_in_gb)
@property
def description(self):
return "Virtual machine '{}': {} core(s), {}GB memory".format(
self.name, self.cores, self.ram_in_gb)
@staticmethod
def allowed_recurring_periods():
return list(filter(
lambda pair: pair[0] in [RecurringPeriod.PER_YEAR,
RecurringPeriod.PER_MONTH, RecurringPeriod.PER_HOUR],
RecurringPeriod.choices))
def __str__(self):
return "VM {} ({} Cores/{} GB RAM) running on {} in cluster {}".format(
self.uuid, self.cores, self.ram_in_gb,
self.vmhost, self.vmcluster)
class VMWithOSProduct(VMProduct):
primary_disk = models.ForeignKey('VMDiskProduct', on_delete=models.CASCADE, null=True)
class VMDiskImageProduct(UncloudModel):
"""
Images are used for cloning/linking.
They are the base for images.
"""
uuid = models.UUIDField(
primary_key=True, default=uuid.uuid4, editable=False
)
owner = models.ForeignKey(
get_user_model(), on_delete=models.CASCADE, editable=False
)
name = models.CharField(max_length=256)
is_os_image = models.BooleanField(default=False)
is_public = models.BooleanField(default=False, editable=False) # only allow admins to set this
size_in_gb = models.FloatField(null=True, blank=True)
import_url = models.URLField(null=True, blank=True)
image_source = models.CharField(max_length=128, null=True)
image_source_type = models.CharField(max_length=128, null=True)
storage_class = models.CharField(max_length=32,
choices = uncloud_storage.models.StorageClass.choices,
default = uncloud_storage.models.StorageClass.SSD)
status = models.CharField(
max_length=32, choices=UncloudStatus.choices, default=UncloudStatus.PENDING
)
def __str__(self):
return "VMDiskImage {} ({}): {} gb".format(self.uuid,
self.name,
self.size_in_gb)
class VMDiskProduct(Product):
"""
The VMDiskProduct is attached to a VM.
It is based on a VMDiskImageProduct that will be used as a basis.
It can be enlarged, but not shrinked compared to the VMDiskImageProduct.
"""
vm = models.ForeignKey(VMProduct, on_delete=models.CASCADE)
image = models.ForeignKey(VMDiskImageProduct, on_delete=models.CASCADE)
size_in_gb = models.FloatField(blank=True)
@property
def description(self):
return "Disk for VM '{}': {}GB".format(self.vm.name, self.size_in_gb)
@property
def recurring_price(self):
return (self.size_in_gb / 10) * 3.5
# Sample code for clean method
# Ensures that a VMDiskProduct can only be created from a VMDiskImageProduct
# that is in status 'active'
# def clean(self):
# if self.image.status != 'active':
# raise ValidationError({
# 'image': 'VM Disk must be created from an active disk image.'
# })
def save(self, *args, **kwargs):
self.full_clean()
super().save(*args, **kwargs)
class VMNetworkCard(models.Model):
vm = models.ForeignKey(VMProduct, on_delete=models.CASCADE)
mac_address = models.BigIntegerField()
ip_address = models.GenericIPAddressField(blank=True,
null=True)
class VMSnapshotProduct(Product):
gb_ssd = models.FloatField(editable=False)
gb_hdd = models.FloatField(editable=False)
vm = models.ForeignKey(VMProduct,
related_name='snapshots',
on_delete=models.CASCADE)