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"""Test logical units."""

import logging

import shutil

import socket

import tempfile

from ganeti import compat

from ganeti import constants

from ganeti import errors

from ganeti import locking

from ganeti import utils

from ganeti.masterd import iallocator

from ganeti.cmdlib.base import NoHooksLU

from ganeti.cmdlib.common import ExpandInstanceUuidAndName, GetWantedNodes, \

  GetWantedInstances

class LUTestDelay(NoHooksLU):

  """Sleep for a specified amount of time.

  This LU sleeps on the master and/or nodes for a specified amount of

  time.

  """

  REQ_BGL = False

  def ExpandNames(self):

    """Expand names and set required locks.

    This expands the node list, if any.

    """

    self.needed_locks = {}

    if self.op.on_nodes:

      # _GetWantedNodes can be used here, but is not always appropriate to use

      # this way in ExpandNames. Check LogicalUnit.ExpandNames docstring for

      # more information.

      (self.op.on_node_uuids, self.op.on_nodes) = \

        GetWantedNodes(self, self.op.on_nodes)

      self.needed_locks[locking.LEVEL_NODE] = self.op.on_node_uuids

  def _TestDelay(self):

    """Do the actual sleep.

    """

    if self.op.on_master:

      if not utils.TestDelay(self.op.duration)[0]:

        raise errors.OpExecError("Error during master delay test")

    if self.op.on_node_uuids:

      result = self.rpc.call_test_delay(self.op.on_node_uuids, self.op.duration)

      for node_uuid, node_result in result.items():

        node_result.Raise("Failure during rpc call to node %s" %

                          self.cfg.GetNodeName(node_uuid))

  def Exec(self, feedback_fn):

    """Execute the test delay opcode, with the wanted repetitions.

    """

    if self.op.repeat == 0:

      self._TestDelay()

    else:

      top_value = self.op.repeat - 1

      for i in range(self.op.repeat):

        self.LogInfo("Test delay iteration %d/%d", i, top_value)

        self._TestDelay()

class LUTestJqueue(NoHooksLU):

  """Utility LU to test some aspects of the job queue.

  """

  REQ_BGL = False

  # Must be lower than default timeout for WaitForJobChange to see whether it

  # notices changed jobs

  _CLIENT_CONNECT_TIMEOUT = 20.0

  _CLIENT_CONFIRM_TIMEOUT = 60.0

  @classmethod

  def _NotifyUsingSocket(cls, cb, errcls):

    """Opens a Unix socket and waits for another program to connect.

    @type cb: callable

    @param cb: Callback to send socket name to client

    @type errcls: class

    @param errcls: Exception class to use for errors

    """

    # Using a temporary directory as there's no easy way to create temporary

    # sockets without writing a custom loop around tempfile.mktemp and

    # socket.bind

    tmpdir = tempfile.mkdtemp()

    try:

      tmpsock = utils.PathJoin(tmpdir, "sock")

      logging.debug("Creating temporary socket at %s", tmpsock)

      sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)

      try:

        sock.bind(tmpsock)

        sock.listen(1)

        # Send details to client

        cb(tmpsock)

        # Wait for client to connect before continuing

        sock.settimeout(cls._CLIENT_CONNECT_TIMEOUT)

        try:

          (conn, _) = sock.accept()

        except socket.error, err:

          raise errcls("Client didn't connect in time (%s)" % err)

      finally:

        sock.close()

    finally:

      # Remove as soon as client is connected

      shutil.rmtree(tmpdir)

    # Wait for client to close

    try:

      try:

        # pylint: disable=E1101

        # Instance of '_socketobject' has no ... member

        conn.settimeout(cls._CLIENT_CONFIRM_TIMEOUT)

        conn.recv(1)

      except socket.error, err:

        raise errcls("Client failed to confirm notification (%s)" % err)

    finally:

      conn.close()

  def _SendNotification(self, test, arg, sockname):

    """Sends a notification to the client.

    @type test: string

    @param test: Test name

    @param arg: Test argument (depends on test)

    @type sockname: string

    @param sockname: Socket path

    """

    self.Log(constants.ELOG_JQUEUE_TEST, (sockname, test, arg))

  def _Notify(self, prereq, test, arg):

    """Notifies the client of a test.

    @type prereq: bool

    @param prereq: Whether this is a prereq-phase test

    @type test: string

    @param test: Test name

    @param arg: Test argument (depends on test)

    """

    if prereq:

      errcls = errors.OpPrereqError

    else:

      errcls = errors.OpExecError

    return self._NotifyUsingSocket(compat.partial(self._SendNotification,

                                                  test, arg),

                                   errcls)

  def CheckArguments(self):

    self.checkargs_calls = getattr(self, "checkargs_calls", 0) + 1

    self.expandnames_calls = 0

  def ExpandNames(self):

    checkargs_calls = getattr(self, "checkargs_calls", 0)

    if checkargs_calls < 1:

      raise errors.ProgrammerError("CheckArguments was not called")

    self.expandnames_calls += 1

    if self.op.notify_waitlock:

      self._Notify(True, constants.JQT_EXPANDNAMES, None)

    self.LogInfo("Expanding names")

    # Get lock on master node (just to get a lock, not for a particular reason)

    self.needed_locks = {

      locking.LEVEL_NODE: self.cfg.GetMasterNode(),

      }

  def Exec(self, feedback_fn):

    if self.expandnames_calls < 1:

      raise errors.ProgrammerError("ExpandNames was not called")

    if self.op.notify_exec:

      self._Notify(False, constants.JQT_EXEC, None)

    self.LogInfo("Executing")

    if self.op.log_messages:

      self._Notify(False, constants.JQT_STARTMSG, len(self.op.log_messages))

      for idx, msg in enumerate(self.op.log_messages):

        self.LogInfo("Sending log message %s", idx + 1)

        feedback_fn(constants.JQT_MSGPREFIX + msg)

        # Report how many test messages have been sent

        self._Notify(False, constants.JQT_LOGMSG, idx + 1)

    if self.op.fail:

      raise errors.OpExecError("Opcode failure was requested")

    return True

class LUTestAllocator(NoHooksLU):

  """Run allocator tests.

  This LU runs the allocator tests

  """

  def CheckPrereq(self):

    """Check prerequisites.

    This checks the opcode parameters depending on the director and mode test.

    """

    if self.op.mode in (constants.IALLOCATOR_MODE_ALLOC,

                        constants.IALLOCATOR_MODE_MULTI_ALLOC):

      (self.inst_uuid, iname) = self.cfg.ExpandInstanceName(self.op.name)

      if iname is not None:

        raise errors.OpPrereqError("Instance '%s' already in the cluster" %

                                   iname, errors.ECODE_EXISTS)

      for row in self.op.disks:

        if (not isinstance(row, dict) or

            constants.IDISK_SIZE not in row or

            not isinstance(row[constants.IDISK_SIZE], int) or

            constants.IDISK_MODE not in row or

            row[constants.IDISK_MODE] not in constants.DISK_ACCESS_SET):

          raise errors.OpPrereqError("Invalid contents of the 'disks'"

                                     " parameter", errors.ECODE_INVAL)

      if self.op.hypervisor is None:

        self.op.hypervisor = self.cfg.GetHypervisorType()

    elif self.op.mode == constants.IALLOCATOR_MODE_RELOC:

      (self.inst_uuid, self.op.name) = ExpandInstanceUuidAndName(self.cfg, None,

                                                                 self.op.name)

      self.relocate_from_node_uuids = \

          list(self.cfg.GetInstanceInfo(self.inst_uuid).secondary_nodes)

    elif self.op.mode in (constants.IALLOCATOR_MODE_CHG_GROUP,

                          constants.IALLOCATOR_MODE_NODE_EVAC):

      if not self.op.instances:

        raise errors.OpPrereqError("Missing instances", errors.ECODE_INVAL)

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

    else:

      raise errors.OpPrereqError("Invalid test allocator mode '%s'" %

                                 self.op.mode, errors.ECODE_INVAL)

    if self.op.direction == constants.IALLOCATOR_DIR_OUT:

      if self.op.iallocator is None:

        raise errors.OpPrereqError("Missing allocator name",

                                   errors.ECODE_INVAL)

  def Exec(self, feedback_fn):

    """Run the allocator test.

    """

    if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:

      req = iallocator.IAReqInstanceAlloc(name=self.op.name,

                                          memory=self.op.memory,

                                          disks=self.op.disks,

                                          disk_template=self.op.disk_template,

                                          os=self.op.os,

                                          tags=self.op.tags,

                                          nics=self.op.nics,

                                          vcpus=self.op.vcpus,

                                          spindle_use=self.op.spindle_use,

                                          hypervisor=self.op.hypervisor,

                                          node_whitelist=None)

    elif self.op.mode == constants.IALLOCATOR_MODE_RELOC:

      req = iallocator.IAReqRelocate(

            inst_uuid=self.inst_uuid,

            relocate_from_node_uuids=list(self.relocate_from_node_uuids))

    elif self.op.mode == constants.IALLOCATOR_MODE_CHG_GROUP:

      req = iallocator.IAReqGroupChange(instances=self.op.instances,

                                        target_groups=self.op.target_groups)

    elif self.op.mode == constants.IALLOCATOR_MODE_NODE_EVAC:

      req = iallocator.IAReqNodeEvac(instances=self.op.instances,

                                     evac_mode=self.op.evac_mode)

    elif self.op.mode == constants.IALLOCATOR_MODE_MULTI_ALLOC:

      disk_template = self.op.disk_template

      insts = [iallocator.IAReqInstanceAlloc(name="%s%s" % (self.op.name, idx),

                                             memory=self.op.memory,

                                             disks=self.op.disks,

                                             disk_template=disk_template,

                                             os=self.op.os,

                                             tags=self.op.tags,

                                             nics=self.op.nics,

                                             vcpus=self.op.vcpus,

                                             spindle_use=self.op.spindle_use,

                                             hypervisor=self.op.hypervisor,

                                             node_whitelist=None)

               for idx in range(self.op.count)]

      req = iallocator.IAReqMultiInstanceAlloc(instances=insts)

    else:

      raise errors.ProgrammerError("Uncatched mode %s in"

                                   " LUTestAllocator.Exec", self.op.mode)

    ial = iallocator.IAllocator(self.cfg, self.rpc, req)

    if self.op.direction == constants.IALLOCATOR_DIR_IN:

      result = ial.in_text

    else:

      ial.Run(self.op.iallocator, validate=False)

      result = ial.out_text

    return result