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# Copyright (C) 2010, 2011, 2012 Google Inc.

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# General Public License for more details.

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"""Node group related commands"""

# pylint: disable=W0401,W0614

# W0401: Wildcard import ganeti.cli

# W0614: Unused import %s from wildcard import (since we need cli)

from ganeti.cli import *

from ganeti import constants

from ganeti import opcodes

from ganeti import utils

from ganeti import compat

from cStringIO import StringIO

#: default list of fields for L{ListGroups}

_LIST_DEF_FIELDS = ["name", "node_cnt", "pinst_cnt", "alloc_policy", "ndparams"]

_ENV_OVERRIDE = compat.UniqueFrozenset(["list"])

def AddGroup(opts, args):

  """Add a node group to the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: a list of length 1 with the name of the group to create

  @rtype: int

  @return: the desired exit code

  """

  ipolicy = CreateIPolicyFromOpts(

    ispecs_mem_size=opts.ispecs_mem_size,

    ispecs_cpu_count=opts.ispecs_cpu_count,

    ispecs_disk_count=opts.ispecs_disk_count,

    ispecs_disk_size=opts.ispecs_disk_size,

    ispecs_nic_count=opts.ispecs_nic_count,

    ipolicy_vcpu_ratio=opts.ipolicy_vcpu_ratio,

    ipolicy_spindle_ratio=opts.ipolicy_spindle_ratio,

    group_ipolicy=True)

  (group_name,) = args

  diskparams = dict(opts.diskparams)

  if opts.disk_state:

    disk_state = utils.FlatToDict(opts.disk_state)

  else:

    disk_state = {}

  hv_state = dict(opts.hv_state)

  op = opcodes.OpGroupAdd(group_name=group_name, ndparams=opts.ndparams,

                          alloc_policy=opts.alloc_policy,

                          diskparams=diskparams, ipolicy=ipolicy,

                          hv_state=hv_state,

                          disk_state=disk_state)

  SubmitOrSend(op, opts)

def AssignNodes(opts, args):

  """Assign nodes to a group.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: args[0]: group to assign nodes to; args[1:]: nodes to assign

  @rtype: int

  @return: the desired exit code

  """

  group_name = args[0]

  node_names = args[1:]

  op = opcodes.OpGroupAssignNodes(group_name=group_name, nodes=node_names,

                                  force=opts.force)

  SubmitOrSend(op, opts)

def _FmtDict(data):

  """Format dict data into command-line format.

  @param data: The input dict to be formatted

  @return: The formatted dict

  """

  if not data:

    return "(empty)"

  return utils.CommaJoin(["%s=%s" % (key, value)

                          for key, value in data.items()])

def ListGroups(opts, args):

  """List node groups and their properties.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: groups to list, or empty for all

  @rtype: int

  @return: the desired exit code

  """

  desired_fields = ParseFields(opts.output, _LIST_DEF_FIELDS)

  fmtoverride = {

    "node_list": (",".join, False),

    "pinst_list": (",".join, False),

    "ndparams": (_FmtDict, False),

    }

  cl = GetClient(query=True)

  return GenericList(constants.QR_GROUP, desired_fields, args, None,

                     opts.separator, not opts.no_headers,

                     format_override=fmtoverride, verbose=opts.verbose,

                     force_filter=opts.force_filter, cl=cl)

def ListGroupFields(opts, args):

  """List node fields.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: fields to list, or empty for all

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient(query=True)

  return GenericListFields(constants.QR_GROUP, args, opts.separator,

                           not opts.no_headers, cl=cl)

def SetGroupParams(opts, args):

  """Modifies a node group's parameters.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the node group name

  @rtype: int

  @return: the desired exit code

  """

  allmods = [opts.ndparams, opts.alloc_policy, opts.diskparams, opts.hv_state,

             opts.disk_state, opts.ispecs_mem_size, opts.ispecs_cpu_count,

             opts.ispecs_disk_count, opts.ispecs_disk_size,

             opts.ispecs_nic_count, opts.ipolicy_vcpu_ratio,

             opts.ipolicy_spindle_ratio, opts.diskparams]

  if allmods.count(None) == len(allmods):

    ToStderr("Please give at least one of the parameters.")

    return 1

  if opts.disk_state:

    disk_state = utils.FlatToDict(opts.disk_state)

  else:

    disk_state = {}

  hv_state = dict(opts.hv_state)

  diskparams = dict(opts.diskparams)

  # set the default values

  to_ipolicy = [

    opts.ispecs_mem_size,

    opts.ispecs_cpu_count,

    opts.ispecs_disk_count,

    opts.ispecs_disk_size,

    opts.ispecs_nic_count,

    ]

  for ispec in to_ipolicy:

    for param in ispec:

      if isinstance(ispec[param], basestring):

        if ispec[param].lower() == "default":

          ispec[param] = constants.VALUE_DEFAULT

  # create ipolicy object

  ipolicy = CreateIPolicyFromOpts(

    ispecs_mem_size=opts.ispecs_mem_size,

    ispecs_cpu_count=opts.ispecs_cpu_count,

    ispecs_disk_count=opts.ispecs_disk_count,

    ispecs_disk_size=opts.ispecs_disk_size,

    ispecs_nic_count=opts.ispecs_nic_count,

    ipolicy_disk_templates=opts.ipolicy_disk_templates,

    ipolicy_vcpu_ratio=opts.ipolicy_vcpu_ratio,

    ipolicy_spindle_ratio=opts.ipolicy_spindle_ratio,

    group_ipolicy=True,

    allowed_values=[constants.VALUE_DEFAULT])

  op = opcodes.OpGroupSetParams(group_name=args[0],

                                ndparams=opts.ndparams,

                                alloc_policy=opts.alloc_policy,

                                hv_state=hv_state,

                                disk_state=disk_state,

                                diskparams=diskparams,

                                ipolicy=ipolicy)

  result = SubmitOrSend(op, opts)

  if result:

    ToStdout("Modified node group %s", args[0])

    for param, data in result:

      ToStdout(" - %-5s -> %s", param, data)

  return 0

def RemoveGroup(opts, args):

  """Remove a node group from the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: a list of length 1 with the name of the group to remove

  @rtype: int

  @return: the desired exit code

  """

  (group_name,) = args

  op = opcodes.OpGroupRemove(group_name=group_name)

  SubmitOrSend(op, opts)

def RenameGroup(opts, args):

  """Rename a node group.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: a list of length 2, [old_name, new_name]

  @rtype: int

  @return: the desired exit code

  """

  group_name, new_name = args

  op = opcodes.OpGroupRename(group_name=group_name, new_name=new_name)

  SubmitOrSend(op, opts)

def EvacuateGroup(opts, args):

  """Evacuate a node group.

  """

  (group_name, ) = args

  cl = GetClient()

  op = opcodes.OpGroupEvacuate(group_name=group_name,

                               iallocator=opts.iallocator,

                               target_groups=opts.to,

                               early_release=opts.early_release)

  result = SubmitOrSend(op, opts, cl=cl)

  # Keep track of submitted jobs

  jex = JobExecutor(cl=cl, opts=opts)

  for (status, job_id) in result[constants.JOB_IDS_KEY]:

    jex.AddJobId(None, status, job_id)

  results = jex.GetResults()

  bad_cnt = len([row for row in results if not row[0]])

  if bad_cnt == 0:

    ToStdout("All instances evacuated successfully.")

    rcode = constants.EXIT_SUCCESS

  else:

    ToStdout("There were %s errors during the evacuation.", bad_cnt)

    rcode = constants.EXIT_FAILURE

  return rcode

def _FormatDict(custom, actual, level=2):

  """Helper function to L{cli.FormatParameterDict}.

  @param custom: The customized dict

  @param actual: The fully filled dict

  """

  buf = StringIO()

  FormatParameterDict(buf, custom, actual, level=level)

  return buf.getvalue().rstrip("\n")

def GroupInfo(_, args):

  """Shows info about node group.

  """

  cl = GetClient(query=True)

  selected_fields = ["name",

                     "ndparams", "custom_ndparams",

                     "diskparams", "custom_diskparams",

                     "ipolicy", "custom_ipolicy"]

  result = cl.QueryGroups(names=args, fields=selected_fields,

                          use_locking=False)

  for (name,

       ndparams, custom_ndparams,

       diskparams, custom_diskparams,

       ipolicy, custom_ipolicy) in result:

    ToStdout("Node group: %s" % name)

    ToStdout("  Node parameters:")

    ToStdout(_FormatDict(custom_ndparams, ndparams))

    ToStdout("  Disk parameters:")

    ToStdout(_FormatDict(custom_diskparams, diskparams))

    ToStdout("  Instance policy:")

    ToStdout(_FormatDict(custom_ipolicy, ipolicy))

commands = {

  "add": (

    AddGroup, ARGS_ONE_GROUP,

    [DRY_RUN_OPT, ALLOC_POLICY_OPT, NODE_PARAMS_OPT, DISK_PARAMS_OPT,

     HV_STATE_OPT, DISK_STATE_OPT, PRIORITY_OPT,

     SUBMIT_OPT] + INSTANCE_POLICY_OPTS,

    "<group_name>", "Add a new node group to the cluster"),

  "assign-nodes": (

    AssignNodes, ARGS_ONE_GROUP + ARGS_MANY_NODES,

    [DRY_RUN_OPT, FORCE_OPT, PRIORITY_OPT, SUBMIT_OPT],

    "<group_name> <node>...", "Assign nodes to a group"),

  "list": (

    ListGroups, ARGS_MANY_GROUPS,

    [NOHDR_OPT, SEP_OPT, FIELDS_OPT, VERBOSE_OPT, FORCE_FILTER_OPT],

    "[<group_name>...]",

    "Lists the node groups in the cluster. The available fields can be shown"

    " using the \"list-fields\" command (see the man page for details)."

    " The default list is (in order): %s." % utils.CommaJoin(_LIST_DEF_FIELDS)),

  "list-fields": (

    ListGroupFields, [ArgUnknown()], [NOHDR_OPT, SEP_OPT], "[fields...]",

    "Lists all available fields for node groups"),

  "modify": (

    SetGroupParams, ARGS_ONE_GROUP,

    [DRY_RUN_OPT, SUBMIT_OPT, ALLOC_POLICY_OPT, NODE_PARAMS_OPT, HV_STATE_OPT,

     DISK_STATE_OPT, DISK_PARAMS_OPT, PRIORITY_OPT] + INSTANCE_POLICY_OPTS,

    "<group_name>", "Alters the parameters of a node group"),

  "remove": (

    RemoveGroup, ARGS_ONE_GROUP, [DRY_RUN_OPT, PRIORITY_OPT, SUBMIT_OPT],

    "[--dry-run] <group-name>",

    "Remove an (empty) node group from the cluster"),

  "rename": (

    RenameGroup, [ArgGroup(min=2, max=2)],

    [DRY_RUN_OPT, SUBMIT_OPT, PRIORITY_OPT],

    "[--dry-run] <group-name> <new-name>", "Rename a node group"),

  "evacuate": (

    EvacuateGroup, [ArgGroup(min=1, max=1)],

    [TO_GROUP_OPT, IALLOCATOR_OPT, EARLY_RELEASE_OPT, SUBMIT_OPT, PRIORITY_OPT],

    "[-I <iallocator>] [--to <group>]",

    "Evacuate all instances within a group"),

  "list-tags": (

    ListTags, ARGS_ONE_GROUP, [],

    "<group_name>", "List the tags of the given group"),

  "add-tags": (

    AddTags, [ArgGroup(min=1, max=1), ArgUnknown()],

    [TAG_SRC_OPT, PRIORITY_OPT, SUBMIT_OPT],

    "<group_name> tag...", "Add tags to the given group"),

  "remove-tags": (

    RemoveTags, [ArgGroup(min=1, max=1), ArgUnknown()],

    [TAG_SRC_OPT, PRIORITY_OPT, SUBMIT_OPT],

    "<group_name> tag...", "Remove tags from the given group"),

  "info": (

    GroupInfo, ARGS_MANY_GROUPS, [], "[<group_name>...]",

    "Show group information"),

  }

def Main():

  return GenericMain(commands,

                     override={"tag_type": constants.TAG_NODEGROUP},

                     env_override=_ENV_OVERRIDE)