Synnefo » snf-ganeti » ganeti-local

import re

import time

import qa_error

from qa_utils import AssertEqual, AssertNotEqual, StartSSH

def _GetDiskStatePath(disk):

  return "/sys/block/%s/device/state" % disk

def _TestInstanceDiskFailure(instance, node, node2, onmaster):

  """Testing disk failure."""

  master = qa_config.GetMasterNode()

  sq = utils.ShellQuoteArgs

  instance_full = qa_utils.ResolveInstanceName(instance)

  node_full = qa_utils.ResolveNodeName(node)

  node2_full = qa_utils.ResolveNodeName(node2)

  cmd = ['gnt-node', 'volumes', '--separator=|', '--no-headers',

         '--output=node,phys,instance',

         node['primary'], node2['primary']]

  output = qa_utils.GetCommandOutput(master['primary'], sq(cmd))

  # Get physical disk names

  re_disk = re.compile(r'^/dev/([a-z]+)\d+$')

  node2disk = {}

  for line in output.splitlines():

    (node_name, phys, inst) = line.split('|')

    if inst == instance_full:

      if node_name not in node2disk:

        node2disk[node_name] = []

      m = re_disk.match(phys)

      if not m:

        raise qa_error.Error("Unknown disk name format: %s" % disk)

      name = m.group(1)

      if name not in node2disk[node_name]:

        node2disk[node_name].append(name)

  if [node2_full, node_full][int(onmaster)] not in node2disk:

    raise qa_error.Error("Couldn't find physical disks used on "

                         "%s node" % ["secondary", "master"][int(onmaster)])

  # Check whether nodes have ability to stop disks

  for node_name, disks in node2disk.iteritems():

    cmds = []

    for disk in disks:

      cmds.append(sq(["test", "-f", _GetDiskStatePath(disk)]))

    AssertEqual(StartSSH(node_name, ' && '.join(cmds)).wait(), 0)

  # Get device paths

  cmd = ['gnt-instance', 'activate-disks', instance['name']]

  output = qa_utils.GetCommandOutput(master['primary'], sq(cmd))

  devpath = []

  for line in output.splitlines():

    (_, _, tmpdevpath) = line.split(':')

    devpath.append(tmpdevpath)

  # Get drbd device paths

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

  output = qa_utils.GetCommandOutput(master['primary'], sq(cmd))

  pattern = (r'\s+-\s+type:\s+drbd,\s+.*$'

             r'\s+primary:\s+(/dev/drbd\d+)\s+')

  drbddevs = re.findall(pattern, output, re.M)

  # Deactivate disks on secondary node

  halted_disks = []

  cmds = []

  for name in node2disk[[node2_full, node_full][int(onmaster)]]:

    halted_disks.append(name)

    cmds.append(sq(["echo", "offline"]) + " >%s" % _GetDiskStatePath(name))

  AssertEqual(StartSSH([node2, node][int(onmaster)]['primary'],

                       '; '.join(cmds)).wait(), 0)

  try:

    # Write something to the disks and give some time to notice the problem

    cmds = []

    for disk in devpath:

      cmds.append(sq(["dd", "count=1", "bs=512", "conv=notrunc",

                      "if=%s" % disk, "of=%s" % disk]))

    for _ in (0, 1, 2):

      AssertEqual(StartSSH(node['primary'], ' && '.join(cmds)).wait(), 0)

      time.sleep(3)

    # For manual checks

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

    AssertEqual(StartSSH(master['primary'], sq(cmd)).wait(), 0)

  finally:

    # Activate disks again

    cmds = []

    for name in halted_disks:

      cmds.append(sq(["echo", "running"]) + " >%s" % _GetDiskStatePath(name))

    AssertEqual(StartSSH([node2, node][int(onmaster)]['primary'],

                         '; '.join(cmds)).wait(), 0)

  # Restart instance

  cmd = ['gnt-instance', 'shutdown', instance['name']]

  AssertEqual(StartSSH(master['primary'], sq(cmd)).wait(), 0)

  cmd = ['gnt-instance', 'startup', '--force', instance['name']]

  AssertEqual(StartSSH(master['primary'], sq(cmd)).wait(), 0)

  # Make sure disks are up again

  cmd = ['gnt-instance', 'activate-disks', instance['name']]

  AssertEqual(StartSSH(master['primary'], sq(cmd)).wait(), 0)

  cmd = ['gnt-cluster', 'verify']

  AssertEqual(StartSSH(master['primary'], sq(cmd)).wait(), 0)

def TestInstanceMasterDiskFailure(instance, node, node2):

  """Testing disk failure on master node."""

  qa_utils.PrintError("Disk failure on primary node cannot be "

                      "tested due to potential crashes.")

  # The following can cause crashes, thus it's disabled until fixed

  #return _TestInstanceDiskFailure(instance, node, node2, True)

def TestInstanceSecondaryDiskFailure(instance, node, node2):

  """Testing disk failure on secondary node."""

  return _TestInstanceDiskFailure(instance, node, node2, False)