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"""Logical units for querying instances."""

import itertools

import logging

import operator

from ganeti import compat

from ganeti import constants

from ganeti import locking

from ganeti import qlang

from ganeti import query

from ganeti.cmdlib.base import QueryBase, NoHooksLU

from ganeti.cmdlib.common import ShareAll, GetWantedInstances, \

  CheckInstanceNodeGroups, CheckInstancesNodeGroups, AnnotateDiskParams

from ganeti.cmdlib.instance_operation import GetInstanceConsole

from ganeti.cmdlib.instance_utils import NICListToTuple

import ganeti.masterd.instance

class InstanceQuery(QueryBase):

  FIELDS = query.INSTANCE_FIELDS

  def ExpandNames(self, lu):

    lu.needed_locks = {}

    lu.share_locks = ShareAll()

    if self.names:

      (_, self.wanted) = GetWantedInstances(lu, self.names)

    else:

      self.wanted = locking.ALL_SET

    self.do_locking = (self.use_locking and

                       query.IQ_LIVE in self.requested_data)

    if self.do_locking:

      lu.needed_locks[locking.LEVEL_INSTANCE] = self.wanted

      lu.needed_locks[locking.LEVEL_NODEGROUP] = []

      lu.needed_locks[locking.LEVEL_NODE] = []

      lu.needed_locks[locking.LEVEL_NETWORK] = []

      lu.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE

    self.do_grouplocks = (self.do_locking and

                          query.IQ_NODES in self.requested_data)

  def DeclareLocks(self, lu, level):

    if self.do_locking:

      if level == locking.LEVEL_NODEGROUP and self.do_grouplocks:

        assert not lu.needed_locks[locking.LEVEL_NODEGROUP]

        # Lock all groups used by instances optimistically; this requires going

        # via the node before it's locked, requiring verification later on

        lu.needed_locks[locking.LEVEL_NODEGROUP] = \

          set(group_uuid

              for instance_name in lu.owned_locks(locking.LEVEL_INSTANCE)

              for group_uuid in

                lu.cfg.GetInstanceNodeGroups(

                  lu.cfg.GetInstanceInfoByName(instance_name).uuid))

      elif level == locking.LEVEL_NODE:

        lu._LockInstancesNodes() # pylint: disable=W0212

      elif level == locking.LEVEL_NETWORK:

        lu.needed_locks[locking.LEVEL_NETWORK] = \

          frozenset(net_uuid

                    for instance_name in lu.owned_locks(locking.LEVEL_INSTANCE)

                    for net_uuid in

                      lu.cfg.GetInstanceNetworks(

                        lu.cfg.GetInstanceInfoByName(instance_name).uuid))

  @staticmethod

  def _CheckGroupLocks(lu):

    owned_instance_names = frozenset(lu.owned_locks(locking.LEVEL_INSTANCE))

    owned_groups = frozenset(lu.owned_locks(locking.LEVEL_NODEGROUP))

    # Check if node groups for locked instances are still correct

    for instance_name in owned_instance_names:

      instance = lu.cfg.GetInstanceInfoByName(instance_name)

      CheckInstanceNodeGroups(lu.cfg, instance.uuid, owned_groups)

  def _GetQueryData(self, lu):

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

    """

    if self.do_grouplocks:

      self._CheckGroupLocks(lu)

    cluster = lu.cfg.GetClusterInfo()

    insts_by_name = dict((inst.name, inst) for

                         inst in lu.cfg.GetAllInstancesInfo().values())

    instance_names = self._GetNames(lu, insts_by_name.keys(),

                                    locking.LEVEL_INSTANCE)

    instance_list = [insts_by_name[node] for node in instance_names]

    node_uuids = frozenset(itertools.chain(*(inst.all_nodes

                                             for inst in instance_list)))

    hv_list = list(set([inst.hypervisor for inst in instance_list]))

    bad_node_uuids = []

    offline_node_uuids = []

    wrongnode_inst_uuids = set()

    # Gather data as requested

    if self.requested_data & set([query.IQ_LIVE, query.IQ_CONSOLE]):

      live_data = {}

      node_data = lu.rpc.call_all_instances_info(node_uuids, hv_list,

                                                 cluster.hvparams)

      for node_uuid in node_uuids:

        result = node_data[node_uuid]

        if result.offline:

          # offline nodes will be in both lists

          assert result.fail_msg

          offline_node_uuids.append(node_uuid)

        if result.fail_msg:

          bad_node_uuids.append(node_uuid)

        elif result.payload:

          for inst_name in result.payload:

            if inst_name in insts_by_name:

              instance = insts_by_name[inst_name]

              if instance.primary_node == node_uuid:

                for iname in result.payload:

                  live_data[insts_by_name[iname].uuid] = result.payload[iname]

              else:

                wrongnode_inst_uuids.add(instance.uuid)

            else:

              # orphan instance; we don't list it here as we don't

              # handle this case yet in the output of instance listing

              logging.warning("Orphan instance '%s' found on node %s",

                              inst_name, lu.cfg.GetNodeName(node_uuid))

              # else no instance is alive

    else:

      live_data = {}

    if query.IQ_DISKUSAGE in self.requested_data:

      gmi = ganeti.masterd.instance

      disk_usage = dict((inst.uuid,

                         gmi.ComputeDiskSize(inst.disk_template,

                                             [{constants.IDISK_SIZE: disk.size}

                                              for disk in inst.disks]))

                        for inst in instance_list)

    else:

      disk_usage = None

    if query.IQ_CONSOLE in self.requested_data:

      consinfo = {}

      for inst in instance_list:

        if inst.uuid in live_data:

          # Instance is running

          consinfo[inst.uuid] = \

            GetInstanceConsole(cluster, inst,

                               lu.cfg.GetNodeInfo(inst.primary_node))

        else:

          consinfo[inst.uuid] = None

    else:

      consinfo = None

    if query.IQ_NODES in self.requested_data:

      nodes = dict(lu.cfg.GetMultiNodeInfo(node_uuids))

      groups = dict((uuid, lu.cfg.GetNodeGroup(uuid))

                    for uuid in set(map(operator.attrgetter("group"),

                                        nodes.values())))

    else:

      nodes = None

      groups = None

    if query.IQ_NETWORKS in self.requested_data:

      net_uuids = itertools.chain(*(lu.cfg.GetInstanceNetworks(i.uuid)

                                    for i in instance_list))

      networks = dict((uuid, lu.cfg.GetNetwork(uuid)) for uuid in net_uuids)

    else:

      networks = None

    return query.InstanceQueryData(instance_list, lu.cfg.GetClusterInfo(),

                                   disk_usage, offline_node_uuids,

                                   bad_node_uuids, live_data,

                                   wrongnode_inst_uuids, consinfo, nodes,

                                   groups, networks)

class LUInstanceQuery(NoHooksLU):

  """Logical unit for querying instances.

  """

  # pylint: disable=W0142

  REQ_BGL = False

  def CheckArguments(self):

    self.iq = InstanceQuery(qlang.MakeSimpleFilter("name", self.op.names),

                             self.op.output_fields, self.op.use_locking)

  def ExpandNames(self):

    self.iq.ExpandNames(self)

  def DeclareLocks(self, level):

    self.iq.DeclareLocks(self, level)

  def Exec(self, feedback_fn):

    return self.iq.OldStyleQuery(self)

class LUInstanceQueryData(NoHooksLU):

  """Query runtime instance data.

  """

  REQ_BGL = False

  def ExpandNames(self):

    self.needed_locks = {}

    # Use locking if requested or when non-static information is wanted

    if not (self.op.static or self.op.use_locking):

      self.LogWarning("Non-static data requested, locks need to be acquired")

      self.op.use_locking = True

    if self.op.instances or not self.op.use_locking:

      # Expand instance names right here

      (_, self.wanted_names) = GetWantedInstances(self, self.op.instances)

    else:

      # Will use acquired locks

      self.wanted_names = None

    if self.op.use_locking:

      self.share_locks = ShareAll()

      if self.wanted_names is None:

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

      else:

        self.needed_locks[locking.LEVEL_INSTANCE] = self.wanted_names

      self.needed_locks[locking.LEVEL_NODEGROUP] = []

      self.needed_locks[locking.LEVEL_NODE] = []

      self.needed_locks[locking.LEVEL_NETWORK] = []

      self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE

  def DeclareLocks(self, level):

    if self.op.use_locking:

      owned_instances = dict(self.cfg.GetMultiInstanceInfoByName(

                               self.owned_locks(locking.LEVEL_INSTANCE)))

      if level == locking.LEVEL_NODEGROUP:

        # Lock all groups used by instances optimistically; this requires going

        # via the node before it's locked, requiring verification later on

        self.needed_locks[locking.LEVEL_NODEGROUP] = \

          frozenset(group_uuid

                    for instance_uuid in owned_instances.keys()

                    for group_uuid in

                    self.cfg.GetInstanceNodeGroups(instance_uuid))

      elif level == locking.LEVEL_NODE:

        self._LockInstancesNodes()

      elif level == locking.LEVEL_NETWORK:

        self.needed_locks[locking.LEVEL_NETWORK] = \

          frozenset(net_uuid

                    for instance_uuid in owned_instances.keys()

                    for net_uuid in

                    self.cfg.GetInstanceNetworks(instance_uuid))

  def CheckPrereq(self):

    """Check prerequisites.

    This only checks the optional instance list against the existing names.

    """

    owned_instances = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))

    owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))

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

    owned_networks = frozenset(self.owned_locks(locking.LEVEL_NETWORK))

    if self.wanted_names is None:

      assert self.op.use_locking, "Locking was not used"

      self.wanted_names = owned_instances

    instances = dict(self.cfg.GetMultiInstanceInfoByName(self.wanted_names))

    if self.op.use_locking:

      CheckInstancesNodeGroups(self.cfg, instances, owned_groups,

                               owned_node_uuids, None)

    else:

      assert not (owned_instances or owned_groups or

                  owned_node_uuids or owned_networks)

    self.wanted_instances = instances.values()

  def _ComputeBlockdevStatus(self, node_uuid, instance, dev):

    """Returns the status of a block device

    """

    if self.op.static or not node_uuid:

      return None

    result = self.rpc.call_blockdev_find(node_uuid, (dev, instance))

    if result.offline:

      return None

    result.Raise("Can't compute disk status for %s" % instance.name)

    status = result.payload

    if status is None:

      return None

    return (status.dev_path, status.major, status.minor,

            status.sync_percent, status.estimated_time,

            status.is_degraded, status.ldisk_status)

  def _ComputeDiskStatus(self, instance, node_uuid2name_fn, dev):

    """Compute block device status.

    """

    (anno_dev,) = AnnotateDiskParams(instance, [dev], self.cfg)

    return self._ComputeDiskStatusInner(instance, None, node_uuid2name_fn,

                                        anno_dev)

  def _ComputeDiskStatusInner(self, instance, snode_uuid, node_uuid2name_fn,

                              dev):

    """Compute block device status.

    @attention: The device has to be annotated already.

    """

    drbd_info = None

    if dev.dev_type in constants.LDS_DRBD:

      # we change the snode then (otherwise we use the one passed in)

      if dev.logical_id[0] == instance.primary_node:

        snode_uuid = dev.logical_id[1]

      else:

        snode_uuid = dev.logical_id[0]

      drbd_info = {

        "primary_node": node_uuid2name_fn(instance.primary_node),

        "primary_minor": dev.logical_id[3],

        "secondary_node": node_uuid2name_fn(snode_uuid),

        "secondary_minor": dev.logical_id[4],

        "port": dev.logical_id[2],

        "secret": dev.logical_id[5],

      }

    dev_pstatus = self._ComputeBlockdevStatus(instance.primary_node,

                                              instance, dev)

    dev_sstatus = self._ComputeBlockdevStatus(snode_uuid, instance, dev)

    if dev.children:

      dev_children = map(compat.partial(self._ComputeDiskStatusInner,

                                        instance, snode_uuid,

                                        node_uuid2name_fn),

                         dev.children)

    else:

      dev_children = []

    return {

      "iv_name": dev.iv_name,

      "dev_type": dev.dev_type,

      "logical_id": dev.logical_id,

      "drbd_info": drbd_info,

      "pstatus": dev_pstatus,

      "sstatus": dev_sstatus,

      "children": dev_children,

      "mode": dev.mode,

      "size": dev.size,

      "spindles": dev.spindles,

      "name": dev.name,

      "uuid": dev.uuid,

      }

  def Exec(self, feedback_fn):

    """Gather and return data"""

    result = {}

    cluster = self.cfg.GetClusterInfo()

    node_uuids = itertools.chain(*(i.all_nodes for i in self.wanted_instances))

    nodes = dict(self.cfg.GetMultiNodeInfo(node_uuids))

    groups = dict(self.cfg.GetMultiNodeGroupInfo(node.group

                                                 for node in nodes.values()))

    for instance in self.wanted_instances:

      pnode = nodes[instance.primary_node]

      if self.op.static or pnode.offline:

        remote_state = None

        if pnode.offline:

          self.LogWarning("Primary node %s is marked offline, returning static"

                          " information only for instance %s" %

                          (pnode.name, instance.name))

      else:

        remote_info = self.rpc.call_instance_info(

            instance.primary_node, instance.name, instance.hypervisor,

            cluster.hvparams[instance.hypervisor])

        remote_info.Raise("Error checking node %s" % pnode.name)

        remote_info = remote_info.payload

        if remote_info and "state" in remote_info:

          remote_state = "up"

        else:

          if instance.admin_state == constants.ADMINST_UP:

            remote_state = "down"

          else:

            remote_state = instance.admin_state

      group2name_fn = lambda uuid: groups[uuid].name

      node_uuid2name_fn = lambda uuid: nodes[uuid].name

      disks = map(compat.partial(self._ComputeDiskStatus, instance,

                                 node_uuid2name_fn),

                  instance.disks)

      snodes_group_uuids = [nodes[snode_uuid].group

                            for snode_uuid in instance.secondary_nodes]

      result[instance.name] = {

        "name": instance.name,

        "config_state": instance.admin_state,

        "run_state": remote_state,

        "pnode": pnode.name,

        "pnode_group_uuid": pnode.group,

        "pnode_group_name": group2name_fn(pnode.group),

        "snodes": map(node_uuid2name_fn, instance.secondary_nodes),

        "snodes_group_uuids": snodes_group_uuids,

        "snodes_group_names": map(group2name_fn, snodes_group_uuids),

        "os": instance.os,

        # this happens to be the same format used for hooks

        "nics": NICListToTuple(self, instance.nics),

        "disk_template": instance.disk_template,

        "disks": disks,

        "hypervisor": instance.hypervisor,

        "network_port": instance.network_port,

        "hv_instance": instance.hvparams,

        "hv_actual": cluster.FillHV(instance, skip_globals=True),

        "be_instance": instance.beparams,

        "be_actual": cluster.FillBE(instance),

        "os_instance": instance.osparams,

        "os_actual": cluster.SimpleFillOS(instance.os, instance.osparams),

        "serial_no": instance.serial_no,

        "mtime": instance.mtime,

        "ctime": instance.ctime,

        "uuid": instance.uuid,

        }

    return result