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#

# Copyright (C) 2006, 2007, 2008 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

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# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

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# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Base class for all hypervisors

"""

class BaseHypervisor(object):

  """Abstract virtualisation technology interface

  The goal is that all aspects of the virtualisation technology must

  be abstracted away from the rest of code.

  """

  def __init__(self):

    pass

  def StartInstance(self, instance, block_devices, extra_args):

    """Start an instance."""

    raise NotImplementedError

  def StopInstance(self, instance, force=False):

    """Stop an instance."""

    raise NotImplementedError

  def RebootInstance(self, instance):

    """Reboot an instance."""

    raise NotImplementedError

  def ListInstances(self):

    """Get the list of running instances."""

    raise NotImplementedError

  def GetInstanceInfo(self, instance_name):

    """Get instance properties.

    Args:

      instance_name: the instance name

    Returns:

      (name, id, memory, vcpus, state, times)

    """

    raise NotImplementedError

  def GetAllInstancesInfo(self):

    """Get properties of all instances.

    Returns:

      [(name, id, memory, vcpus, stat, times),...]

    """

    raise NotImplementedError

  def GetNodeInfo(self):

    """Return information about the node.

    The return value is a dict, which has to have the following items:

      (all values in MiB)

      - memory_total: the total memory size on the node

      - memory_free: the available memory on the node for instances

      - memory_dom0: the memory used by the node itself, if available

    """

    raise NotImplementedError

  @staticmethod

  def GetShellCommandForConsole(instance):

    """Return a command for connecting to the console of an instance.

    """

    raise NotImplementedError

  def Verify(self):

    """Verify the hypervisor.

    """

    raise NotImplementedError