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##############################################################################
# Copyright (c) 2018 Parker Berberian, Sawyer Bergeron, and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from __future__ import annotations
import re
from typing import Optional
from django.db.models import Q
from dashboard.exceptions import ResourceAvailabilityException
from resource_inventory.models import (
Resource,
ResourceBundle,
ResourceTemplate,
ResourceConfiguration,
Network,
Vlan,
PhysicalNetwork,
InterfaceConfiguration,
)
from account.models import Lab
from django.contrib.auth.models import User
class ResourceManager:
instance = None
def __init__(self):
pass
@staticmethod
def getInstance() -> ResourceManager:
if ResourceManager.instance is None:
ResourceManager.instance = ResourceManager()
return ResourceManager.instance
def getAvailableResourceTemplates(self, lab: Lab, user: Optional[User] = None) -> list[ResourceTemplate]:
filter = Q(public=True)
if user:
filter = filter | Q(owner=user)
filter = filter & Q(temporary=False) & Q(lab=lab)
return ResourceTemplate.objects.filter(filter)
def templateIsReservable(self, resource_template: ResourceTemplate):
"""
Check if the required resources to reserve this template is available.
No changes to the database
"""
# count up hosts
profile_count = {}
for config in resource_template.getConfigs():
if config.profile not in profile_count:
profile_count[config.profile] = 0
profile_count[config.profile] += 1
# check that all required hosts are available
for profile in profile_count.keys():
available = len(profile.get_resources(lab=resource_template.lab, unreserved=True))
needed = profile_count[profile]
if available < needed:
return False
return True
# public interface
def deleteResourceBundle(self, resourceBundle: ResourceBundle):
raise NotImplementedError("Resource Bundle Deletion Not Implemented")
def releaseResourceBundle(self, resourceBundle: ResourceBundle):
resourceBundle.release()
def get_vlans(self, resourceTemplate: ResourceTemplate) -> dict[str, int]:
"""
returns: dict from network name to the associated vlan number (backend vlan id)
"""
networks = {}
vlan_manager = resourceTemplate.lab.vlan_manager
for network in resourceTemplate.networks.all():
if network.is_public:
public_net = vlan_manager.get_public_vlan()
vlan_manager.reserve_public_vlan(public_net.vlan)
networks[network.name] = public_net.vlan
else:
# already throws if can't get requested count, so can always index in @ 0
vlans = vlan_manager.get_vlans(count=1)
vlan_manager.reserve_vlans(vlans[0])
networks[network.name] = vlans[0]
return networks
def instantiateTemplate(self, resource_template: ResourceTemplate):
"""
Convert a ResourceTemplate into a ResourceBundle.
Takes in a ResourceTemplate and reserves all the
Resources needed and returns a completed ResourceBundle.
"""
resource_bundle = ResourceBundle.objects.create(template=resource_template)
res_configs = resource_template.getConfigs()
resources = []
vlan_map = self.get_vlans(resource_template)
for config in res_configs:
try:
phys_res = self.acquireHost(config)
phys_res.bundle = resource_bundle
phys_res.config = config
resources.append(phys_res)
self.configureNetworking(resource_bundle, phys_res, vlan_map)
phys_res.save()
except Exception as e:
self.fail_acquire(resources, vlan_map, resource_template)
raise e
return resource_bundle
def configureNetworking(self, resource_bundle: ResourceBundle, resource: Resource, vlan_map: dict[str, int]):
"""
@vlan_map: dict from network name to the associated vlan number (backend vlan id)
"""
for physical_interface in resource.interfaces.all():
# assign interface configs
iface_config = InterfaceConfiguration.objects.get(
profile=physical_interface.profile,
resource_config=resource.config
)
physical_interface.acts_as = iface_config
physical_interface.acts_as.save()
physical_interface.config.clear()
for connection in iface_config.connections.all():
physicalNetwork = PhysicalNetwork.objects.create(
vlan_id=vlan_map[connection.network.name],
generic_network=connection.network,
bundle=resource_bundle,
)
physical_interface.config.add(
Vlan.objects.create(
vlan_id=vlan_map[connection.network.name],
tagged=connection.vlan_is_tagged,
public=connection.network.is_public,
network=physicalNetwork
)
)
# private interface
def acquireHost(self, resource_config: ResourceConfiguration) -> Resource:
resources = resource_config.profile.get_resources(
lab=resource_config.template.lab,
unreserved=True
)
try:
resource = resources[0] # TODO: should we randomize and 'load balance' the servers?
resource.config = resource_config
resource.reserve()
return resource
except IndexError:
raise ResourceAvailabilityException("No available resources of requested type")
def releaseNetworks(self, template, vlans):
vlan_manager = template.lab.vlan_manager
for net_name, vlan_id in vlans.items():
net = Network.objects.get(name=net_name, bundle=template)
if(net.is_public):
vlan_manager.release_public_vlan(vlan_id)
else:
vlan_manager.release_vlans(vlan_id)
def fail_acquire(self, hosts, vlans, template):
self.releaseNetworks(template, vlans)
for host in hosts:
host.release()
class HostNameValidator(object):
regex = r'^[A-Za-z0-9][A-Za-z0-9-]*$'
message = "Hostnames can only contain alphanumeric characters and hyphens (-). Hostnames must start with a letter"
pattern = re.compile(regex)
@classmethod
def is_valid_hostname(cls, hostname):
return len(hostname) < 65 and cls.pattern.fullmatch(hostname) is not None
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