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# Copyright (C) 2007 Google Inc.

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# General Public License for more details.

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"""Daemon related QA tests.

"""

import time

from ganeti import utils

from ganeti import constants

import qa_config

import qa_utils

import qa_error

from qa_utils import AssertEqual, StartSSH

def _InstanceRunning(node, name):

  """Checks whether an instance is running.

  Args:

    node: Node the instance runs on

    name: Full name of Xen instance

  """

  cmd = utils.ShellQuoteArgs(['xm', 'list', name]) + ' >/dev/null'

  ret = StartSSH(node['primary'], cmd).wait()

  return ret == 0

def _XmShutdownInstance(node, name):

  """Shuts down instance using "xm" and waits for completion.

  Args:

    node: Node the instance runs on

    name: Full name of Xen instance

  """

  master = qa_config.GetMasterNode()

  cmd = ['xm', 'shutdown', name]

  AssertEqual(StartSSH(node['primary'],

                       utils.ShellQuoteArgs(cmd)).wait(), 0)

  # Wait up to a minute

  end = time.time() + 60

  while time.time() <= end:

    if not _InstanceRunning(node, name):

      break

    time.sleep(5)

  else:

    raise qa_error.Error("xm shutdown failed")

def _ResetWatcherDaemon():

  """Removes the watcher daemon's state file.

  Args:

    node: Node to be reset

  """

  master = qa_config.GetMasterNode()

  cmd = ['rm', '-f', constants.WATCHER_STATEFILE]

  AssertEqual(StartSSH(master['primary'],

                       utils.ShellQuoteArgs(cmd)).wait(), 0)

def _RunWatcherDaemon():

  """Runs the ganeti-watcher daemon on the master node.

  """

  master = qa_config.GetMasterNode()

  cmd = ['ganeti-watcher', '-d']

  AssertEqual(StartSSH(master['primary'],

                       utils.ShellQuoteArgs(cmd)).wait(), 0)

def PrintCronWarning():

  """Shows a warning about the cron job.

  """

  msg = ("For the following tests it's recommended to turn off the"

         " ganeti-watcher cronjob.")

  print

  print qa_utils.FormatWarning(msg)

def TestInstanceAutomaticRestart(node, instance):

  """Test automatic restart of instance by ganeti-watcher.

  """

  master = qa_config.GetMasterNode()

  inst_name = qa_utils.ResolveInstanceName(instance)

  _ResetWatcherDaemon()

  _XmShutdownInstance(node, inst_name)

  _RunWatcherDaemon()

  time.sleep(5)

  if not _InstanceRunning(node, inst_name):

    raise qa_error.Error("Daemon didn't restart instance")

  cmd = ['gnt-instance', 'info', inst_name]

  AssertEqual(StartSSH(master['primary'],

                       utils.ShellQuoteArgs(cmd)).wait(), 0)

def TestInstanceConsecutiveFailures(node, instance):

  """Test five consecutive instance failures.

  """

  master = qa_config.GetMasterNode()

  inst_name = qa_utils.ResolveInstanceName(instance)

  _ResetWatcherDaemon()

  for should_start in ([True] * 5) + [False]:

    _XmShutdownInstance(node, inst_name)

    _RunWatcherDaemon()

    time.sleep(5)

    if bool(_InstanceRunning(node, inst_name)) != should_start:

      if should_start:

        msg = "Instance not started when it should"

      else:

        msg = "Instance started when it shouldn't"

      raise qa_error.Error(msg)

  cmd = ['gnt-instance', 'info', inst_name]

  AssertEqual(StartSSH(master['primary'],

                       utils.ShellQuoteArgs(cmd)).wait(), 0)