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# General Public License for more details.

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"""Miscellaneous logical units that don't fit into any category."""

import logging

import time

from ganeti import compat

from ganeti import constants

from ganeti import errors

from ganeti import locking

from ganeti import qlang

from ganeti import query

from ganeti import utils

from ganeti.cmdlib.base import NoHooksLU, QueryBase

from ganeti.cmdlib.common import GetWantedNodes, SupportsOob

class LUOobCommand(NoHooksLU):

  """Logical unit for OOB handling.

  """

  REQ_BGL = False

  _SKIP_MASTER = (constants.OOB_POWER_OFF, constants.OOB_POWER_CYCLE)

  def ExpandNames(self):

    """Gather locks we need.

    """

    if self.op.node_names:

      self.op.node_names = GetWantedNodes(self, self.op.node_names)

      lock_names = self.op.node_names

    else:

      lock_names = locking.ALL_SET

    self.needed_locks = {

      locking.LEVEL_NODE: lock_names,

      }

    self.share_locks[locking.LEVEL_NODE_ALLOC] = 1

    if not self.op.node_names:

      # Acquire node allocation lock only if all nodes are affected

      self.needed_locks[locking.LEVEL_NODE_ALLOC] = locking.ALL_SET

  def CheckPrereq(self):

    """Check prerequisites.

    This checks:

     - the node exists in the configuration

     - OOB is supported

    Any errors are signaled by raising errors.OpPrereqError.

    """

    self.nodes = []

    self.master_node = self.cfg.GetMasterNode()

    assert self.op.power_delay >= 0.0

    if self.op.node_names:

      if (self.op.command in self._SKIP_MASTER and

          self.master_node in self.op.node_names):

        master_node_obj = self.cfg.GetNodeInfo(self.master_node)

        master_oob_handler = SupportsOob(self.cfg, master_node_obj)

        if master_oob_handler:

          additional_text = ("run '%s %s %s' if you want to operate on the"

                             " master regardless") % (master_oob_handler,

                                                      self.op.command,

                                                      self.master_node)

        else:

          additional_text = "it does not support out-of-band operations"

        raise errors.OpPrereqError(("Operating on the master node %s is not"

                                    " allowed for %s; %s") %

                                   (self.master_node, self.op.command,

                                    additional_text), errors.ECODE_INVAL)

    else:

      self.op.node_names = self.cfg.GetNodeList()

      if self.op.command in self._SKIP_MASTER:

        self.op.node_names.remove(self.master_node)

    if self.op.command in self._SKIP_MASTER:

      assert self.master_node not in self.op.node_names

    for (node_name, node) in self.cfg.GetMultiNodeInfo(self.op.node_names):

      if node is None:

        raise errors.OpPrereqError("Node %s not found" % node_name,

                                   errors.ECODE_NOENT)

      else:

        self.nodes.append(node)

      if (not self.op.ignore_status and

          (self.op.command == constants.OOB_POWER_OFF and not node.offline)):

        raise errors.OpPrereqError(("Cannot power off node %s because it is"

                                    " not marked offline") % node_name,

                                   errors.ECODE_STATE)

  def Exec(self, feedback_fn):

    """Execute OOB and return result if we expect any.

    """

    master_node = self.master_node

    ret = []

    for idx, node in enumerate(utils.NiceSort(self.nodes,

                                              key=lambda node: node.name)):

      node_entry = [(constants.RS_NORMAL, node.name)]

      ret.append(node_entry)

      oob_program = SupportsOob(self.cfg, node)

      if not oob_program:

        node_entry.append((constants.RS_UNAVAIL, None))

        continue

      logging.info("Executing out-of-band command '%s' using '%s' on %s",

                   self.op.command, oob_program, node.name)

      result = self.rpc.call_run_oob(master_node, oob_program,

                                     self.op.command, node.name,

                                     self.op.timeout)

      if result.fail_msg:

        self.LogWarning("Out-of-band RPC failed on node '%s': %s",

                        node.name, result.fail_msg)

        node_entry.append((constants.RS_NODATA, None))

      else:

        try:

          self._CheckPayload(result)

        except errors.OpExecError, err:

          self.LogWarning("Payload returned by node '%s' is not valid: %s",

                          node.name, err)

          node_entry.append((constants.RS_NODATA, None))

        else:

          if self.op.command == constants.OOB_HEALTH:

            # For health we should log important events

            for item, status in result.payload:

              if status in [constants.OOB_STATUS_WARNING,

                            constants.OOB_STATUS_CRITICAL]:

                self.LogWarning("Item '%s' on node '%s' has status '%s'",

                                item, node.name, status)

          if self.op.command == constants.OOB_POWER_ON:

            node.powered = True

          elif self.op.command == constants.OOB_POWER_OFF:

            node.powered = False

          elif self.op.command == constants.OOB_POWER_STATUS:

            powered = result.payload[constants.OOB_POWER_STATUS_POWERED]

            if powered != node.powered:

              logging.warning(("Recorded power state (%s) of node '%s' does not"

                               " match actual power state (%s)"), node.powered,

                              node.name, powered)

          # For configuration changing commands we should update the node

          if self.op.command in (constants.OOB_POWER_ON,

                                 constants.OOB_POWER_OFF):

            self.cfg.Update(node, feedback_fn)

          node_entry.append((constants.RS_NORMAL, result.payload))

          if (self.op.command == constants.OOB_POWER_ON and

              idx < len(self.nodes) - 1):

            time.sleep(self.op.power_delay)

    return ret

  def _CheckPayload(self, result):

    """Checks if the payload is valid.

    @param result: RPC result

    @raises errors.OpExecError: If payload is not valid

    """

    errs = []

    if self.op.command == constants.OOB_HEALTH:

      if not isinstance(result.payload, list):

        errs.append("command 'health' is expected to return a list but got %s" %

                    type(result.payload))

      else:

        for item, status in result.payload:

          if status not in constants.OOB_STATUSES:

            errs.append("health item '%s' has invalid status '%s'" %

                        (item, status))

    if self.op.command == constants.OOB_POWER_STATUS:

      if not isinstance(result.payload, dict):

        errs.append("power-status is expected to return a dict but got %s" %

                    type(result.payload))

    if self.op.command in [

      constants.OOB_POWER_ON,

      constants.OOB_POWER_OFF,

      constants.OOB_POWER_CYCLE,

      ]:

      if result.payload is not None:

        errs.append("%s is expected to not return payload but got '%s'" %

                    (self.op.command, result.payload))

    if errs:

      raise errors.OpExecError("Check of out-of-band payload failed due to %s" %

                               utils.CommaJoin(errs))

class ExtStorageQuery(QueryBase):

  FIELDS = query.EXTSTORAGE_FIELDS

  def ExpandNames(self, lu):

    # Lock all nodes in shared mode

    # Temporary removal of locks, should be reverted later

    # TODO: reintroduce locks when they are lighter-weight

    lu.needed_locks = {}

    #self.share_locks[locking.LEVEL_NODE] = 1

    #self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET

    # The following variables interact with _QueryBase._GetNames

    if self.names:

      self.wanted = self.names

    else:

      self.wanted = locking.ALL_SET

    self.do_locking = self.use_locking

  def DeclareLocks(self, lu, level):

    pass

  @staticmethod

  def _DiagnoseByProvider(rlist):

    """Remaps a per-node return list into an a per-provider per-node dictionary

    @param rlist: a map with node names as keys and ExtStorage objects as values

    @rtype: dict

    @return: a dictionary with extstorage providers as keys and as

        value another map, with nodes as keys and tuples of

        (path, status, diagnose, parameters) as values, eg::

          {"provider1": {"node1": [(/usr/lib/..., True, "", [])]

                         "node2": [(/srv/..., False, "missing file")]

                         "node3": [(/srv/..., True, "", [])]

          }

    """

    all_es = {}

    # we build here the list of nodes that didn't fail the RPC (at RPC

    # level), so that nodes with a non-responding node daemon don't

    # make all OSes invalid

    good_nodes = [node_name for node_name in rlist

                  if not rlist[node_name].fail_msg]

    for node_name, nr in rlist.items():

      if nr.fail_msg or not nr.payload:

        continue

      for (name, path, status, diagnose, params) in nr.payload:

        if name not in all_es:

          # build a list of nodes for this os containing empty lists

          # for each node in node_list

          all_es[name] = {}

          for nname in good_nodes:

            all_es[name][nname] = []

        # convert params from [name, help] to (name, help)

        params = [tuple(v) for v in params]

        all_es[name][node_name].append((path, status, diagnose, params))

    return all_es

  def _GetQueryData(self, lu):

    """Computes the list of nodes and their attributes.

    """

    # Locking is not used

    assert not (compat.any(lu.glm.is_owned(level)

                           for level in locking.LEVELS

                           if level != locking.LEVEL_CLUSTER) or

                self.do_locking or self.use_locking)

    valid_nodes = [node.name

                   for node in lu.cfg.GetAllNodesInfo().values()

                   if not node.offline and node.vm_capable]

    pol = self._DiagnoseByProvider(lu.rpc.call_extstorage_diagnose(valid_nodes))

    data = {}

    nodegroup_list = lu.cfg.GetNodeGroupList()

    for (es_name, es_data) in pol.items():

      # For every provider compute the nodegroup validity.

      # To do this we need to check the validity of each node in es_data

      # and then construct the corresponding nodegroup dict:

      #      { nodegroup1: status

      #        nodegroup2: status

      #      }

      ndgrp_data = {}

      for nodegroup in nodegroup_list:

        ndgrp = lu.cfg.GetNodeGroup(nodegroup)

        nodegroup_nodes = ndgrp.members

        nodegroup_name = ndgrp.name

        node_statuses = []

        for node in nodegroup_nodes:

          if node in valid_nodes:

            if es_data[node] != []:

              node_status = es_data[node][0][1]

              node_statuses.append(node_status)

            else:

              node_statuses.append(False)

        if False in node_statuses:

          ndgrp_data[nodegroup_name] = False

        else:

          ndgrp_data[nodegroup_name] = True

      # Compute the provider's parameters

      parameters = set()

      for idx, esl in enumerate(es_data.values()):

        valid = bool(esl and esl[0][1])

        if not valid:

          break

        node_params = esl[0][3]

        if idx == 0:

          # First entry

          parameters.update(node_params)

        else:

          # Filter out inconsistent values

          parameters.intersection_update(node_params)

      params = list(parameters)

      # Now fill all the info for this provider

      info = query.ExtStorageInfo(name=es_name, node_status=es_data,

                                  nodegroup_status=ndgrp_data,

                                  parameters=params)

      data[es_name] = info

    # Prepare data in requested order

    return [data[name] for name in self._GetNames(lu, pol.keys(), None)

            if name in data]

class LUExtStorageDiagnose(NoHooksLU):

  """Logical unit for ExtStorage diagnose/query.

  """

  REQ_BGL = False

  def CheckArguments(self):

    self.eq = ExtStorageQuery(qlang.MakeSimpleFilter("name", self.op.names),

                               self.op.output_fields, False)

  def ExpandNames(self):

    self.eq.ExpandNames(self)

  def Exec(self, feedback_fn):

    return self.eq.OldStyleQuery(self)

class LURestrictedCommand(NoHooksLU):

  """Logical unit for executing restricted commands.

  """

  REQ_BGL = False

  def ExpandNames(self):

    if self.op.nodes:

      self.op.nodes = GetWantedNodes(self, self.op.nodes)

    self.needed_locks = {

      locking.LEVEL_NODE: self.op.nodes,

      }

    self.share_locks = {

      locking.LEVEL_NODE: not self.op.use_locking,

      }

  def CheckPrereq(self):

    """Check prerequisites.

    """

  def Exec(self, feedback_fn):

    """Execute restricted command and return output.

    """

    owned_nodes = frozenset(self.owned_locks(locking.LEVEL_NODE))

    # Check if correct locks are held

    assert set(self.op.nodes).issubset(owned_nodes)

    rpcres = self.rpc.call_restricted_command(self.op.nodes, self.op.command)

    result = []

    for node_name in self.op.nodes:

      nres = rpcres[node_name]

      if nres.fail_msg:

        msg = ("Command '%s' on node '%s' failed: %s" %

               (self.op.command, node_name, nres.fail_msg))

        result.append((False, msg))

      else:

        result.append((True, nres.payload))

    return result