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# Copyright (C) 2013 Google Inc.

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

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# General Public License for more details.

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"""QA utility functions for managing instances

"""

import operator

from ganeti import utils

from ganeti import constants

from ganeti import pathutils

import qa_config

import qa_error

import qa_utils

from qa_utils import AssertIn, AssertCommand

def RemoveInstance(instance):

  AssertCommand(["gnt-instance", "remove", "-f", instance.name])

def GetGenericAddParameters(inst, disk_template, force_mac=None):

  params = ["-B"]

  params.append("%s=%s,%s=%s" % (constants.BE_MINMEM,

                                 qa_config.get(constants.BE_MINMEM),

                                 constants.BE_MAXMEM,

                                 qa_config.get(constants.BE_MAXMEM)))

  if disk_template != constants.DT_DISKLESS:

    for idx, disk in enumerate(qa_config.GetDiskOptions()):

      size = disk.get("size")

      name = disk.get("name")

      diskparams = "%s:size=%s" % (idx, size)

      if name:

        diskparams += ",name=%s" % name

      if qa_config.AreSpindlesSupported():

        spindles = disk.get("spindles")

        if spindles is None:

          raise qa_error.Error("'spindles' is a required parameter for disks"

                               " when you enable exclusive storage tests")

        diskparams += ",spindles=%s" % spindles

      params.extend(["--disk", diskparams])

  # Set static MAC address if configured

  if force_mac:

    nic0_mac = force_mac

  else:

    nic0_mac = inst.GetNicMacAddr(0, None)

  if nic0_mac:

    params.extend(["--net", "0:mac=%s" % nic0_mac])

  return params

def _CreateInstanceByDiskTemplateRaw(nodes_spec, disk_template, fail=False):

  """Creates an instance with the given disk template on the given nodes(s).

     Note that this function does not check if enough nodes are given for

     the respective disk template.

  @type nodes_spec: string

  @param nodes_spec: string specification of one node (by node name) or several

                     nodes according to the requirements of the disk template

  @type disk_template: string

  @param disk_template: the disk template to be used by the instance

  @return: the created instance

  """

  instance = qa_config.AcquireInstance()

  try:

    cmd = (["gnt-instance", "add",

            "--os-type=%s" % qa_config.get("os"),

            "--disk-template=%s" % disk_template,

            "--node=%s" % nodes_spec] +

           GetGenericAddParameters(instance, disk_template))

    cmd.append(instance.name)

    AssertCommand(cmd, fail=fail)

    if not fail:

      CheckSsconfInstanceList(instance.name)

      instance.SetDiskTemplate(disk_template)

      return instance

  except:

    instance.Release()

    raise

  # Handle the case where creation is expected to fail

  assert fail

  instance.Release()

  return None

def CreateInstanceDrbd8(nodes, fail=False):

  """Creates an instance using disk template 'drbd' on the given nodes.

  @type nodes: list of nodes

  @param nodes: nodes to be used by the instance

  @return: the created instance

  """

  assert len(nodes) > 1

  return _CreateInstanceByDiskTemplateRaw(

    ":".join(map(operator.attrgetter("primary"), nodes)),

    constants.DT_DRBD8, fail=fail)

def CreateInstanceByDiskTemplateOneNode(nodes, disk_template, fail=False):

  """Creates an instance using the given disk template for disk templates

     for which one given node is sufficient. These templates are for example:

     plain, diskless, file, sharedfile, blockdev, rados.

  @type nodes: list of nodes

  @param nodes: a list of nodes, whose first element is used to create the

                instance

  @type disk_template: string

  @param disk_template: the disk template to be used by the instance

  @return: the created instance

  """

  assert len(nodes) > 0

  return _CreateInstanceByDiskTemplateRaw(nodes[0].primary, disk_template,

                                          fail=fail)

def CreateInstanceByDiskTemplate(nodes, disk_template, fail=False):

  """Given a disk template, this function creates an instance using

     the template. It uses the required number of nodes depending on

     the disk template. This function is intended to be used by tests

     that don't care about the specifics of the instance other than

     that it uses the given disk template.

     Note: If you use this function, make sure to call

     'TestInstanceRemove' at the end of your tests to avoid orphaned

     instances hanging around and interfering with the following tests.

  @type nodes: list of nodes

  @param nodes: the list of the nodes on which the instance will be placed;

                it needs to have sufficiently many elements for the given

                disk template

  @type disk_template: string

  @param disk_template: the disk template to be used by the instance

  @return: the created instance

  """

  if disk_template == constants.DT_DRBD8:

    return CreateInstanceDrbd8(nodes, fail=fail)

  elif disk_template in [constants.DT_DISKLESS, constants.DT_PLAIN,

                         constants.DT_FILE]:

    return CreateInstanceByDiskTemplateOneNode(nodes, disk_template, fail=fail)

  else:

    # FIXME: This assumes that for all other disk templates, we only need one

    # node and no disk template specific parameters. This else-branch is

    # currently only used in cases where we expect failure. Extend it when

    # QA needs for these templates change.

    return CreateInstanceByDiskTemplateOneNode(nodes, disk_template, fail=fail)

def _ReadSsconfInstanceList():

  """Reads ssconf_instance_list from the master node.

  """

  master = qa_config.GetMasterNode()

  ssconf_path = utils.PathJoin(pathutils.DATA_DIR,

                               "ssconf_%s" % constants.SS_INSTANCE_LIST)

  cmd = ["cat", qa_utils.MakeNodePath(master, ssconf_path)]

  return qa_utils.GetCommandOutput(master.primary,

                                   utils.ShellQuoteArgs(cmd)).splitlines()

def CheckSsconfInstanceList(instance):

  """Checks if a certain instance is in the ssconf instance list.

  @type instance: string

  @param instance: Instance name

  """

  AssertIn(qa_utils.ResolveInstanceName(instance),

           _ReadSsconfInstanceList())