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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 AssertMatch, AssertCommand, StartSSH, GetCommandOutput

def _InstanceRunning(node, name):

  """Checks whether an instance is running.

  @param node: node the instance runs on

  @param name: full name of the 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.

  @param node: node the instance runs on

  @param name: full name of Xen instance

  """

  AssertCommand(["xm", "shutdown", name], node=node)

  # 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.

  """

  AssertCommand(["rm", "-f", constants.WATCHER_STATEFILE])

def _RunWatcherDaemon():

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

  """

  AssertCommand(["ganeti-watcher", "-d", "--ignore-pause"])

def TestPauseWatcher():

  """Tests and pauses the watcher.

  """

  master = qa_config.GetMasterNode()

  AssertCommand(["gnt-cluster", "watcher", "pause", "4h"])

  cmd = ["gnt-cluster", "watcher", "info"]

  output = GetCommandOutput(master["primary"],

                            utils.ShellQuoteArgs(cmd))

  AssertMatch(output, r"^.*\bis paused\b.*")

def TestResumeWatcher():

  """Tests and unpauses the watcher.

  """

  master = qa_config.GetMasterNode()

  AssertCommand(["gnt-cluster", "watcher", "continue"])

  cmd = ["gnt-cluster", "watcher", "info"]

  output = GetCommandOutput(master["primary"],

                            utils.ShellQuoteArgs(cmd))

  AssertMatch(output, r"^.*\bis not paused\b.*")

def TestInstanceAutomaticRestart(node, instance):

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

  """

  inst_name = qa_utils.ResolveInstanceName(instance["name"])

  _ResetWatcherDaemon()

  _XmShutdownInstance(node, inst_name)

  _RunWatcherDaemon()

  time.sleep(5)

  if not _InstanceRunning(node, inst_name):

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

  AssertCommand(["gnt-instance", "info", inst_name])

def TestInstanceConsecutiveFailures(node, instance):

  """Test five consecutive instance failures.

  """

  inst_name = qa_utils.ResolveInstanceName(instance["name"])

  _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)

  AssertCommand(["gnt-instance", "info", inst_name])