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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
##############################################################################
import re
from dashboard.exceptions import (
ResourceExistenceException,
ResourceAvailabilityException,
ResourceProvisioningException,
ModelValidationException,
)
from resource_inventory.models import (
Host,
HostConfiguration,
ResourceBundle,
HostProfile,
Network,
Vlan
)
class ResourceManager:
instance = None
def __init__(self):
pass
@staticmethod
def getInstance():
if ResourceManager.instance is None:
ResourceManager.instance = ResourceManager()
return ResourceManager.instance
def getAvailableHostTypes(self, lab):
hostset = Host.objects.filter(lab=lab).filter(booked=False).filter(working=True)
hostprofileset = HostProfile.objects.filter(host__in=hostset, labs=lab)
return set(hostprofileset)
def hostsAvailable(self, grb):
"""
This method will check if the given GenericResourceBundle
is available. No changes to the database
"""
# count up hosts
profile_count = {}
for host in grb.getResources():
if host.profile not in profile_count:
profile_count[host.profile] = 0
profile_count[host.profile] += 1
# check that all required hosts are available
for profile in profile_count.keys():
available = Host.objects.filter(
booked=False,
working=True,
lab=grb.lab,
profile=profile
).count()
needed = profile_count[profile]
if available < needed:
return False
return True
# public interface
def deleteResourceBundle(self, resourceBundle):
for host in Host.objects.filter(bundle=resourceBundle):
host.release()
resourceBundle.delete()
def get_vlans(self, genericResourceBundle):
networks = {}
vlan_manager = genericResourceBundle.lab.vlan_manager
for network in genericResourceBundle.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:
vlan = vlan_manager.get_vlan()
vlan_manager.reserve_vlans(vlan)
networks[network.name] = vlan
return networks
def convertResourceBundle(self, genericResourceBundle, config=None):
"""
Takes in a GenericResourceBundle and 'converts' it into a ResourceBundle
"""
resource_bundle = ResourceBundle.objects.create(template=genericResourceBundle)
generic_hosts = genericResourceBundle.getResources()
physical_hosts = []
vlan_map = self.get_vlans(genericResourceBundle)
for generic_host in generic_hosts:
host_config = None
if config:
host_config = HostConfiguration.objects.get(bundle=config, host=generic_host)
try:
physical_host = self.acquireHost(generic_host, genericResourceBundle.lab.name)
except ResourceAvailabilityException:
self.fail_acquire(physical_hosts, vlan_map, genericResourceBundle)
raise ResourceAvailabilityException("Could not provision hosts, not enough available")
try:
physical_host.bundle = resource_bundle
physical_host.template = generic_host
physical_host.config = host_config
physical_hosts.append(physical_host)
self.configureNetworking(physical_host, vlan_map)
except Exception:
self.fail_acquire(physical_hosts, vlan_map, genericResourceBundle)
raise ResourceProvisioningException("Network configuration failed.")
try:
physical_host.save()
except Exception:
self.fail_acquire(physical_hosts, vlan_map, genericResourceBundle)
raise ModelValidationException("Saving hosts failed")
return resource_bundle
def configureNetworking(self, host, vlan_map):
generic_interfaces = list(host.template.generic_interfaces.all())
for int_num, physical_interface in enumerate(host.interfaces.all()):
generic_interface = generic_interfaces[int_num]
physical_interface.config.clear()
for connection in generic_interface.connections.all():
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=connection.network
)
)
# private interface
def acquireHost(self, genericHost, labName):
host_full_set = Host.objects.filter(lab__name__exact=labName, profile=genericHost.profile)
if not host_full_set.first():
raise ResourceExistenceException("No matching servers found")
host_set = host_full_set.filter(booked=False, working=True)
if not host_set.first():
raise ResourceAvailabilityException("No unbooked hosts match requested hosts")
host = host_set.first()
host.booked = True
host.template = genericHost
host.save()
return host
def releaseNetworks(self, grb, vlan_manager, vlans):
for net_name, vlan_id in vlans.items():
net = Network.objects.get(name=net_name, bundle=grb)
if(net.is_public):
vlan_manager.release_public_vlan(vlan_id)
else:
vlan_manager.release_vlans(vlan_id)
def fail_acquire(self, hosts, vlans, grb):
vlan_manager = grb.lab.vlan_manager
self.releaseNetworks(grb, vlan_manager, 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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