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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 dashboard.exceptions import (
ResourceExistenceException,
ResourceAvailabilityException,
ResourceProvisioningException,
ModelValidationException,
)
from resource_inventory.models import Host, HostConfiguration, ResourceBundle, HostProfile
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.getHosts():
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,
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):
self.releaseHost(host)
resourceBundle.delete()
def convertResourceBundle(self, genericResourceBundle, lab=None, config=None):
"""
Takes in a GenericResourceBundle and 'converts' it into a ResourceBundle
"""
resource_bundle = ResourceBundle()
resource_bundle.template = genericResourceBundle
resource_bundle.save()
hosts = genericResourceBundle.getHosts()
# current supported case: user creating new booking
# currently unsupported: editing existing booking
physical_hosts = []
for host in hosts:
host_config = None
if config:
host_config = HostConfiguration.objects.get(bundle=config, host=host)
try:
physical_host = self.acquireHost(host, genericResourceBundle.lab.name)
except ResourceAvailabilityException:
self.fail_acquire(physical_hosts)
raise ResourceAvailabilityException("Could not provision hosts, not enough available")
try:
physical_host.bundle = resource_bundle
physical_host.template = host
physical_host.config = host_config
physical_hosts.append(physical_host)
self.configureNetworking(physical_host)
except Exception:
self.fail_acquire(physical_hosts)
raise ResourceProvisioningException("Network configuration failed.")
try:
physical_host.save()
except Exception:
self.fail_acquire(physical_hosts)
raise ModelValidationException("Saving hosts failed")
return resource_bundle
def configureNetworking(self, host):
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 vlan in generic_interface.vlans.all():
physical_interface.config.add(vlan)
# 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)
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 releaseHost(self, host):
host.template = None
host.bundle = None
host.booked = False
host.save()
def fail_acquire(self, hosts):
for host in hosts:
self.releaseHost(host)
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