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# Copyright (c) 2012 NTT DOCOMO, INC.
# Copyright (c) 2011 OpenStack Foundation
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Manage hosts in the current zone.
"""
from nova.scheduler import host_manager
class BaremetalNodeState(host_manager.HostState):
"""Mutable and immutable information tracked for a host.
This is an attempt to remove the ad-hoc data structures
previously used and lock down access.
"""
def update_from_compute_node(self, compute):
"""Update information about a host from its compute_node info."""
all_ram_mb = compute['memory_mb']
free_disk_mb = compute['free_disk_gb'] * 1024
free_ram_mb = compute['free_ram_mb']
self.free_ram_mb = free_ram_mb
self.total_usable_ram_mb = all_ram_mb
self.free_disk_mb = free_disk_mb
self.vcpus_total = compute['vcpus']
self.vcpus_used = compute['vcpus_used']
def consume_from_instance(self, instance):
self.free_ram_mb = 0
self.free_disk_mb = 0
self.vcpus_used = self.vcpus_total
def new_host_state(self, host, node, capabilities=None, service=None):
"""Returns an instance of BaremetalHostState or HostState according to
capabilities. If 'baremetal_driver' is in capabilities, it returns an
instance of BaremetalHostState. If not, returns an instance of HostState.
"""
if capabilities is None:
capabilities = {}
cap = capabilities.get('compute', {})
if bool(cap.get('baremetal_driver')):
return BaremetalNodeState(host, node, capabilities, service)
else:
return host_manager.HostState(host, node, capabilities, service)
class BaremetalHostManager(host_manager.HostManager):
"""Bare-Metal HostManager class."""
# Override.
# Yes, this is not a class, and it is OK
host_state_cls = new_host_state
def __init__(self):
super(BaremetalHostManager, self).__init__()
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