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#

# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Google Inc.

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# 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

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# 02110-1301, USA.

"""Node related commands"""

# pylint: disable-msg=W0401,W0613,W0614,C0103

# W0401: Wildcard import ganeti.cli

# W0613: Unused argument, since all functions follow the same API

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

# C0103: Invalid name gnt-node

from ganeti.cli import *

from ganeti import cli

from ganeti import bootstrap

from ganeti import opcodes

from ganeti import utils

from ganeti import constants

from ganeti import errors

from ganeti import netutils

from cStringIO import StringIO

#: default list of field for L{ListNodes}

_LIST_DEF_FIELDS = [

  "name", "dtotal", "dfree",

  "mtotal", "mnode", "mfree",

  "pinst_cnt", "sinst_cnt",

  ]

#: Default field list for L{ListVolumes}

_LIST_VOL_DEF_FIELDS = ["node", "phys", "vg", "name", "size", "instance"]

#: default list of field for L{ListStorage}

_LIST_STOR_DEF_FIELDS = [

  constants.SF_NODE,

  constants.SF_TYPE,

  constants.SF_NAME,

  constants.SF_SIZE,

  constants.SF_USED,

  constants.SF_FREE,

  constants.SF_ALLOCATABLE,

  ]

#: default list of power commands

_LIST_POWER_COMMANDS = ["on", "off", "cycle", "status"]

#: headers (and full field list) for L{ListStorage}

_LIST_STOR_HEADERS = {

  constants.SF_NODE: "Node",

  constants.SF_TYPE: "Type",

  constants.SF_NAME: "Name",

  constants.SF_SIZE: "Size",

  constants.SF_USED: "Used",

  constants.SF_FREE: "Free",

  constants.SF_ALLOCATABLE: "Allocatable",

  }

#: User-facing storage unit types

_USER_STORAGE_TYPE = {

  constants.ST_FILE: "file",

  constants.ST_LVM_PV: "lvm-pv",

  constants.ST_LVM_VG: "lvm-vg",

  }

_STORAGE_TYPE_OPT = \

  cli_option("-t", "--storage-type",

             dest="user_storage_type",

             choices=_USER_STORAGE_TYPE.keys(),

             default=None,

             metavar="STORAGE_TYPE",

             help=("Storage type (%s)" %

                   utils.CommaJoin(_USER_STORAGE_TYPE.keys())))

_REPAIRABLE_STORAGE_TYPES = \

  [st for st, so in constants.VALID_STORAGE_OPERATIONS.iteritems()

   if constants.SO_FIX_CONSISTENCY in so]

_MODIFIABLE_STORAGE_TYPES = constants.MODIFIABLE_STORAGE_FIELDS.keys()

_OOB_COMMAND_ASK = frozenset([constants.OOB_POWER_OFF,

                              constants.OOB_POWER_CYCLE])

NONODE_SETUP_OPT = cli_option("--no-node-setup", default=True,

                              action="store_false", dest="node_setup",

                              help=("Do not make initial SSH setup on remote"

                                    " node (needs to be done manually)"))

IGNORE_STATUS_OPT = cli_option("--ignore-status", default=False,

                               action="store_true", dest="ignore_status",

                               help=("Ignore the Node(s) offline status"

                                     " (potentially DANGEROUS)"))

FORCE_MASTER_OPT = cli_option("--force-master", default=False,

                              action="store_true", dest="force_master",

                              help=("Operate on the master node too"

                                    " (potentially DANGEROUS)"))

OOB_TIMEOUT_OPT = cli_option("--oob-timeout", dest="oob_timeout", type="int",

                         default=constants.OOB_TIMEOUT,

                         help="Maximum time to wait for out-of-band helper")

def ConvertStorageType(user_storage_type):

  """Converts a user storage type to its internal name.

  """

  try:

    return _USER_STORAGE_TYPE[user_storage_type]

  except KeyError:

    raise errors.OpPrereqError("Unknown storage type: %s" % user_storage_type,

                               errors.ECODE_INVAL)

def _RunSetupSSH(options, nodes):

  """Wrapper around utils.RunCmd to call setup-ssh

  @param options: The command line options

  @param nodes: The nodes to setup

  """

  cmd = [constants.SETUP_SSH]

  # Pass --debug|--verbose to the external script if set on our invocation

  # --debug overrides --verbose

  if options.debug:

    cmd.append("--debug")

  elif options.verbose:

    cmd.append("--verbose")

  if not options.ssh_key_check:

    cmd.append("--no-ssh-key-check")

  cmd.extend(nodes)

  result = utils.RunCmd(cmd, interactive=True)

  if result.failed:

    errmsg = ("Command '%s' failed with exit code %s; output %r" %

              (result.cmd, result.exit_code, result.output))

    raise errors.OpExecError(errmsg)

@UsesRPC

def AddNode(opts, args):

  """Add a node to the cluster.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  node = netutils.GetHostname(name=args[0]).name

  readd = opts.readd

  try:

    output = cl.QueryNodes(names=[node], fields=['name', 'sip'],

                           use_locking=False)

    node_exists, sip = output[0]

  except (errors.OpPrereqError, errors.OpExecError):

    node_exists = ""

    sip = None

  if readd:

    if not node_exists:

      ToStderr("Node %s not in the cluster"

               " - please retry without '--readd'", node)

      return 1

  else:

    if node_exists:

      ToStderr("Node %s already in the cluster (as %s)"

               " - please retry with '--readd'", node, node_exists)

      return 1

    sip = opts.secondary_ip

  # read the cluster name from the master

  output = cl.QueryConfigValues(['cluster_name'])

  cluster_name = output[0]

  if not readd and opts.node_setup:

    ToStderr("-- WARNING -- \n"

             "Performing this operation is going to replace the ssh daemon"

             " keypair\n"

             "on the target machine (%s) with the ones of the"

             " current one\n"

             "and grant full intra-cluster ssh root access to/from it\n", node)

  if opts.node_setup:

    _RunSetupSSH(opts, [node])

  bootstrap.SetupNodeDaemon(cluster_name, node, opts.ssh_key_check)

  op = opcodes.OpNodeAdd(node_name=args[0], secondary_ip=sip,

                         readd=opts.readd, group=opts.nodegroup,

                         vm_capable=opts.vm_capable, ndparams=opts.ndparams,

                         master_capable=opts.master_capable)

  SubmitOpCode(op, opts=opts)

def ListNodes(opts, args):

  """List nodes and their properties.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  selected_fields = ParseFields(opts.output, _LIST_DEF_FIELDS)

  fmtoverride = dict.fromkeys(["pinst_list", "sinst_list", "tags"],

                              (",".join, False))

  return GenericList(constants.QR_NODE, selected_fields, args, opts.units,

                     opts.separator, not opts.no_headers,

                     format_override=fmtoverride)

def ListNodeFields(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

  """

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

                           not opts.no_headers)

def EvacuateNode(opts, args):

  """Relocate all secondary instance from a node.

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

  @type args: list

  @param args: should be an empty list

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  force = opts.force

  dst_node = opts.dst_node

  iallocator = opts.iallocator

  op = opcodes.OpNodeEvacStrategy(nodes=args,

                                  iallocator=iallocator,

                                  remote_node=dst_node)

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

  if not result:

    # no instances to migrate

    ToStderr("No secondary instances on node(s) %s, exiting.",

             utils.CommaJoin(args))

    return constants.EXIT_SUCCESS

  if not force and not AskUser("Relocate instance(s) %s from node(s) %s?" %

                               (",".join("'%s'" % name[0] for name in result),

                               utils.CommaJoin(args))):

    return constants.EXIT_CONFIRMATION

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

  for row in result:

    iname = row[0]

    node = row[1]

    ToStdout("Will relocate instance %s to node %s", iname, node)

    op = opcodes.OpInstanceReplaceDisks(instance_name=iname,

                                        remote_node=node, disks=[],

                                        mode=constants.REPLACE_DISK_CHG,

                                        early_release=opts.early_release)

    jex.QueueJob(iname, op)

  results = jex.GetResults()

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

  if bad_cnt == 0:

    ToStdout("All %d instance(s) failed over successfully.", len(results))

    rcode = constants.EXIT_SUCCESS

  else:

    ToStdout("There were errors during the failover:\n"

             "%d error(s) out of %d instance(s).", bad_cnt, len(results))

    rcode = constants.EXIT_FAILURE

  return rcode

def FailoverNode(opts, args):

  """Failover all primary instance on a node.

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

  @type args: list

  @param args: should be an empty list

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  force = opts.force

  selected_fields = ["name", "pinst_list"]

  # these fields are static data anyway, so it doesn't matter, but

  # locking=True should be safer

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

                         use_locking=False)

  node, pinst = result[0]

  if not pinst:

    ToStderr("No primary instances on node %s, exiting.", node)

    return 0

  pinst = utils.NiceSort(pinst)

  retcode = 0

  if not force and not AskUser("Fail over instance(s) %s?" %

                               (",".join("'%s'" % name for name in pinst))):

    return 2

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

  for iname in pinst:

    op = opcodes.OpInstanceFailover(instance_name=iname,

                                    ignore_consistency=opts.ignore_consistency)

    jex.QueueJob(iname, op)

  results = jex.GetResults()

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

  if bad_cnt == 0:

    ToStdout("All %d instance(s) failed over successfully.", len(results))

  else:

    ToStdout("There were errors during the failover:\n"

             "%d error(s) out of %d instance(s).", bad_cnt, len(results))

  return retcode

def MigrateNode(opts, args):

  """Migrate all primary instance on a node.

  """

  cl = GetClient()

  force = opts.force

  selected_fields = ["name", "pinst_list"]

  result = cl.QueryNodes(names=args, fields=selected_fields, use_locking=False)

  node, pinst = result[0]

  if not pinst:

    ToStdout("No primary instances on node %s, exiting." % node)

    return 0

  pinst = utils.NiceSort(pinst)

  if not force and not AskUser("Migrate instance(s) %s?" %

                               (",".join("'%s'" % name for name in pinst))):

    return 2

  # this should be removed once --non-live is deprecated

  if not opts.live and opts.migration_mode is not None:

    raise errors.OpPrereqError("Only one of the --non-live and "

                               "--migration-mode options can be passed",

                               errors.ECODE_INVAL)

  if not opts.live: # --non-live passed

    mode = constants.HT_MIGRATION_NONLIVE

  else:

    mode = opts.migration_mode

  op = opcodes.OpNodeMigrate(node_name=args[0], mode=mode)

  SubmitOpCode(op, cl=cl, opts=opts)

def ShowNodeConfig(opts, args):

  """Show node information.

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

  @type args: list

  @param args: should either be an empty list, in which case

      we show information about all nodes, or should contain

      a list of nodes to be queried for information

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  result = cl.QueryNodes(fields=["name", "pip", "sip",

                                 "pinst_list", "sinst_list",

                                 "master_candidate", "drained", "offline",

                                 "master_capable", "vm_capable", "powered",

                                 "ndparams", "custom_ndparams"],

                         names=args, use_locking=False)

  for (name, primary_ip, secondary_ip, pinst, sinst, is_mc, drained, offline,

       master_capable, vm_capable, powered, ndparams,

       ndparams_custom) in result:

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

    ToStdout("  primary ip: %s", primary_ip)

    ToStdout("  secondary ip: %s", secondary_ip)

    ToStdout("  master candidate: %s", is_mc)

    ToStdout("  drained: %s", drained)

    ToStdout("  offline: %s", offline)

    if powered is not None:

      ToStdout("  powered: %s", powered)

    ToStdout("  master_capable: %s", master_capable)

    ToStdout("  vm_capable: %s", vm_capable)

    if vm_capable:

      if pinst:

        ToStdout("  primary for instances:")

        for iname in utils.NiceSort(pinst):

          ToStdout("    - %s", iname)

      else:

        ToStdout("  primary for no instances")

      if sinst:

        ToStdout("  secondary for instances:")

        for iname in utils.NiceSort(sinst):

          ToStdout("    - %s", iname)

      else:

        ToStdout("  secondary for no instances")

    ToStdout("  node parameters:")

    buf = StringIO()

    FormatParameterDict(buf, ndparams_custom, ndparams, level=2)

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

  return 0

def RemoveNode(opts, args):

  """Remove a node from the cluster.

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

  @type args: list

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

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  op = opcodes.OpNodeRemove(node_name=args[0])

  SubmitOpCode(op, opts=opts)

  return 0

def PowercycleNode(opts, args):

  """Remove a node from the cluster.

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

  @type args: list

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

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  node = args[0]

  if (not opts.confirm and

      not AskUser("Are you sure you want to hard powercycle node %s?" % node)):

    return 2

  op = opcodes.OpNodePowercycle(node_name=node, force=opts.force)

  result = SubmitOpCode(op, opts=opts)

  if result:

    ToStderr(result)

  return 0

def PowerNode(opts, args):

  """Change/ask power state of a node.

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

  @type args: list

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

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  client = GetClient()

  command = args.pop(0)

  if opts.no_headers:

    headers = None

  else:

    headers = {"node": "Node", "status": "Status"}

  if command not in _LIST_POWER_COMMANDS:

    ToStderr("power subcommand %s not supported." % command)

    return constants.EXIT_FAILURE

  nodes = [node for (node, ) in client.QueryNodes(args, ["name"], False)]

  oob_command = "power-%s" % command

  if oob_command in _OOB_COMMAND_ASK:

    if not args and not opts.show_all:

      ToStderr("Please provide at least one node or use --all for this command"

               " as this is a potentially harmful command")

      return constants.EXIT_FAILURE

    elif args and opts.show_all:

      ToStderr("Please provide either nodes or use --all, can not use both at"

               " the same time")

      return constants.EXIT_FAILURE

    elif not opts.force and not ConfirmOperation(nodes, "nodes",

                                                 "power %s" % command):

      return constants.EXIT_FAILURE

  opcodelist = []

  if not opts.ignore_status and oob_command == constants.OOB_POWER_OFF:

    # TODO: This is a little ugly as we can't catch and revert

    for node in nodes:

      opcodelist.append(opcodes.OpNodeSetParams(node_name=node, offline=True,

                                                auto_promote=opts.auto_promote))

  opcodelist.append(opcodes.OpOobCommand(node_names=nodes,

                                         command=oob_command,

                                         ignore_status=opts.ignore_status,

                                         force_master=opts.force_master,

                                         timeout=opts.oob_timeout))

  cli.SetGenericOpcodeOpts(opcodelist, opts)

  job_id = cli.SendJob(opcodelist)

  # We just want the OOB Opcode status

  # If it fails PollJob gives us the error message in it

  result = cli.PollJob(job_id)[-1]

  errs = 0

  data = []

  for node_result in result:

    (node_tuple, data_tuple) = node_result

    (_, node_name) = node_tuple

    (data_status, data_node) = data_tuple

    if data_status == constants.RS_NORMAL:

      if oob_command == constants.OOB_POWER_STATUS:

        if data_node[constants.OOB_POWER_STATUS_POWERED]:

          text = "powered"

        else:

          text = "unpowered"

        data.append([node_name, text])

      else:

        # We don't expect data here, so we just say, it was successfully invoked

        data.append([node_name, "invoked"])

    else:

      errs += 1

      data.append([node_name, cli.FormatResultError(data_status)])

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=["node", "status"], data=data)

  for line in data:

    ToStdout(line)

  if errs:

    return constants.EXIT_FAILURE

  else:

    return constants.EXIT_SUCCESS

def Health(opts, args):

  """Show health of a node using OOB.

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

  @type args: list

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

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  op = opcodes.OpOobCommand(node_names=args, command=constants.OOB_HEALTH,

                            timeout=opts.oob_timeout)

  result = SubmitOpCode(op, opts=opts)

  if opts.no_headers:

    headers = None

  else:

    headers = {"node": "Node", "status": "Status"}

  errs = 0

  data = []

  for node_result in result:

    (node_tuple, data_tuple) = node_result

    (_, node_name) = node_tuple

    (data_status, data_node) = data_tuple

    if data_status == constants.RS_NORMAL:

      data.append([node_name, "%s=%s" % tuple(data_node[0])])

      for item, status in data_node[1:]:

        data.append(["", "%s=%s" % (item, status)])

    else:

      errs += 1

      data.append([node_name, cli.FormatResultError(data_status)])

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=["node", "status"], data=data)

  for line in data:

    ToStdout(line)

  if errs:

    return constants.EXIT_FAILURE

  else:

    return constants.EXIT_SUCCESS

def ListVolumes(opts, args):

  """List logical volumes on node(s).

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

  @type args: list

  @param args: should either be an empty list, in which case

      we list data for all nodes, or contain a list of nodes

      to display data only for those

  @rtype: int

  @return: the desired exit code

  """

  selected_fields = ParseFields(opts.output, _LIST_VOL_DEF_FIELDS)

  op = opcodes.OpNodeQueryvols(nodes=args, output_fields=selected_fields)

  output = SubmitOpCode(op, opts=opts)

  if not opts.no_headers:

    headers = {"node": "Node", "phys": "PhysDev",

               "vg": "VG", "name": "Name",

               "size": "Size", "instance": "Instance"}

  else:

    headers = None

  unitfields = ["size"]

  numfields = ["size"]

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=selected_fields, unitfields=unitfields,

                       numfields=numfields, data=output, units=opts.units)

  for line in data:

    ToStdout(line)

  return 0

def ListStorage(opts, args):

  """List physical volumes on node(s).

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

  @type args: list

  @param args: should either be an empty list, in which case

      we list data for all nodes, or contain a list of nodes

      to display data only for those

  @rtype: int

  @return: the desired exit code

  """

  # TODO: Default to ST_FILE if LVM is disabled on the cluster

  if opts.user_storage_type is None:

    opts.user_storage_type = constants.ST_LVM_PV

  storage_type = ConvertStorageType(opts.user_storage_type)

  selected_fields = ParseFields(opts.output, _LIST_STOR_DEF_FIELDS)

  op = opcodes.OpNodeQueryStorage(nodes=args,

                                  storage_type=storage_type,

                                  output_fields=selected_fields)

  output = SubmitOpCode(op, opts=opts)

  if not opts.no_headers:

    headers = {

      constants.SF_NODE: "Node",

      constants.SF_TYPE: "Type",

      constants.SF_NAME: "Name",

      constants.SF_SIZE: "Size",

      constants.SF_USED: "Used",

      constants.SF_FREE: "Free",

      constants.SF_ALLOCATABLE: "Allocatable",

      }

  else:

    headers = None

  unitfields = [constants.SF_SIZE, constants.SF_USED, constants.SF_FREE]

  numfields = [constants.SF_SIZE, constants.SF_USED, constants.SF_FREE]

  # change raw values to nicer strings

  for row in output:

    for idx, field in enumerate(selected_fields):

      val = row[idx]

      if field == constants.SF_ALLOCATABLE:

        if val:

          val = "Y"

        else:

          val = "N"

      row[idx] = str(val)

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=selected_fields, unitfields=unitfields,

                       numfields=numfields, data=output, units=opts.units)

  for line in data:

    ToStdout(line)

  return 0

def ModifyStorage(opts, args):

  """Modify storage volume on a node.

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

  @type args: list

  @param args: should contain 3 items: node name, storage type and volume name

  @rtype: int

  @return: the desired exit code

  """

  (node_name, user_storage_type, volume_name) = args

  storage_type = ConvertStorageType(user_storage_type)

  changes = {}

  if opts.allocatable is not None:

    changes[constants.SF_ALLOCATABLE] = opts.allocatable

  if changes:

    op = opcodes.OpNodeModifyStorage(node_name=node_name,

                                     storage_type=storage_type,

                                     name=volume_name,

                                     changes=changes)

    SubmitOpCode(op, opts=opts)

  else:

    ToStderr("No changes to perform, exiting.")

def RepairStorage(opts, args):

  """Repairs a storage volume on a node.

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