text: # Copyright 2012 Cloudbase Solutions Srl
  # 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.
  
  """
  Management class for host operations.
  """
  import os
  import platform
  
  from oslo.config import cfg
  
  from nova.openstack.common import jsonutils
  from nova.openstack.common import log as logging
  from nova.openstack.common import units
  from nova.virt.hyperv import constants
  from nova.virt.hyperv import utilsfactory
  
  CONF = cfg.CONF
  CONF.import_opt('my_ip', 'nova.netconf')
  LOG = logging.getLogger(__name__)
  
  
  class HostOps(object):
      def __init__(self):
          self._stats = None
          self._hostutils = utilsfactory.get_hostutils()
          self._pathutils = utilsfactory.get_pathutils()
  
      def _get_cpu_info(self):
          """Get the CPU information.
          :returns: A dictionary containing the main properties
          of the central processor in the hypervisor.
          """
          cpu_info = dict()
  
          processors = self._hostutils.get_cpus_info()
  
          w32_arch_dict = constants.WMI_WIN32_PROCESSOR_ARCHITECTURE
          cpu_info['arch'] = w32_arch_dict.get(processors[0]['Architecture'],
                                               'Unknown')
          cpu_info['model'] = processors[0]['Name']
          cpu_info['vendor'] = processors[0]['Manufacturer']
  
          topology = dict()
          topology['sockets'] = len(processors)
          topology['cores'] = processors[0]['NumberOfCores']
          topology['threads'] = (processors[0]['NumberOfLogicalProcessors'] /
                                 processors[0]['NumberOfCores'])
          cpu_info['topology'] = topology
  
          features = list()
          for fkey, fname in constants.PROCESSOR_FEATURE.items():
              if self._hostutils.is_cpu_feature_present(fkey):
                  features.append(fname)
          cpu_info['features'] = features
  
          return cpu_info
  
      def _get_memory_info(self):
          (total_mem_kb, free_mem_kb) = self._hostutils.get_memory_info()
          total_mem_mb = total_mem_kb / 1024
          free_mem_mb = free_mem_kb / 1024
          return (total_mem_mb, free_mem_mb, total_mem_mb - free_mem_mb)
  
      def _get_local_hdd_info_gb(self):
          drive = os.path.splitdrive(self._pathutils.get_instances_dir())[0]
          (size, free_space) = self._hostutils.get_volume_info(drive)
  
          total_gb = size / units.Gi
          free_gb = free_space / units.Gi
          used_gb = total_gb - free_gb
          return (total_gb, free_gb, used_gb)
  
      def _get_hypervisor_version(self):
          """Get hypervisor version.
          :returns: hypervisor version (ex. 12003)
          """
          version = self._hostutils.get_windows_version().replace('.', '')
          LOG.debug('Windows version: %s ', version)
          return version
  
      def get_available_resource(self):
          """Retrieve resource info.
  
          This method is called when nova-compute launches, and
          as part of a periodic task.
  
          :returns: dictionary describing resources
  
          """
          LOG.debug('get_available_resource called')
  
          (total_mem_mb,
           free_mem_mb,
           used_mem_mb) = self._get_memory_info()
  
          (total_hdd_gb,
           free_hdd_gb,
           used_hdd_gb) = self._get_local_hdd_info_gb()
  
          cpu_info = self._get_cpu_info()
          cpu_topology = cpu_info['topology']
          vcpus = (cpu_topology['sockets'] *
                   cpu_topology['cores'] *
                   cpu_topology['threads'])
  
          dic = {'vcpus': vcpus,
                 'memory_mb': total_mem_mb,
                 'memory_mb_used': used_mem_mb,
                 'local_gb': total_hdd_gb,
                 'local_gb_used': used_hdd_gb,
                 'hypervisor_type': "hyperv",
                 'hypervisor_version': self._get_hypervisor_version(),
                 'hypervisor_hostname': platform.node(),
                 'vcpus_used': 0,
                 'cpu_info': jsonutils.dumps(cpu_info),
                  'supported_instances': jsonutils.dumps(
                      [('i686', 'hyperv', 'hvm'),
                      ('x86_64', 'hyperv', 'hvm')])
                 }
  
          return dic
  
      def _update_stats(self):
          LOG.debug("Updating host stats")
  
          (total_mem_mb, free_mem_mb, used_mem_mb) = self._get_memory_info()
          (total_hdd_gb,
           free_hdd_gb,
           used_hdd_gb) = self._get_local_hdd_info_gb()
  
          data = {}
          data["disk_total"] = total_hdd_gb
          data["disk_used"] = used_hdd_gb
          data["disk_available"] = free_hdd_gb
          data["host_memory_total"] = total_mem_mb
          data["host_memory_overhead"] = used_mem_mb
          data["host_memory_free"] = free_mem_mb
          data["host_memory_free_computed"] = free_mem_mb
          data["supported_instances"] = [('i686', 'hyperv', 'hvm'),
                                         ('x86_64', 'hyperv', 'hvm')]
          data["hypervisor_hostname"] = platform.node()
  
          self._stats = data
  
      def get_host_stats(self, refresh=False):
          """Return the current state of the host.
  
             If 'refresh' is True, run the update first.
          """
          LOG.debug("get_host_stats called")
  
          if refresh or not self._stats:
              self._update_stats()
          return self._stats
  
      def host_power_action(self, host, action):
          """Reboots, shuts down or powers up the host."""
          pass
  
      def get_host_ip_addr(self):
          host_ip = CONF.my_ip
          if not host_ip:
              # Return the first available address
              host_ip = self._hostutils.get_local_ips()[0]
          LOG.debug("Host IP address is: %s", host_ip)
          return host_ip
  