Synnefo » snf-ganeti » ganeti-local

#

#

# Copyright (C) 2007 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Utilities for QA tests.

"""

import os

import re

import sys

import subprocess

from ganeti import utils

import qa_config

import qa_error

_INFO_SEQ = None

_WARNING_SEQ = None

_ERROR_SEQ = None

_RESET_SEQ = None

def _SetupColours():

  """Initializes the colour constants.

  """

  global _INFO_SEQ, _WARNING_SEQ, _ERROR_SEQ, _RESET_SEQ

  # Don't use colours if stdout isn't a terminal

  if not sys.stdout.isatty():

    return

  try:

    import curses

  except ImportError:

    # Don't use colours if curses module can't be imported

    return

  curses.setupterm()

  _RESET_SEQ = curses.tigetstr("op")

  setaf = curses.tigetstr("setaf")

  _INFO_SEQ = curses.tparm(setaf, curses.COLOR_GREEN)

  _WARNING_SEQ = curses.tparm(setaf, curses.COLOR_YELLOW)

  _ERROR_SEQ = curses.tparm(setaf, curses.COLOR_RED)

_SetupColours()

def AssertIn(item, sequence):

  """Raises an error when item is not in sequence.

  """

  if item not in sequence:

    raise qa_error.Error('%r not in %r' % (item, sequence))

def AssertEqual(first, second):

  """Raises an error when values aren't equal.

  """

  if not first == second:

    raise qa_error.Error('%r == %r' % (first, second))

def AssertNotEqual(first, second):

  """Raises an error when values are equal.

  """

  if not first != second:

    raise qa_error.Error('%r != %r' % (first, second))

def AssertMatch(string, pattern):

  """Raises an error when string doesn't match regexp pattern.

  """

  if not re.match(pattern, string):

    raise qa_error.Error("%r doesn't match /%r/" % (string, pattern))

def AssertCommand(cmd, fail=False, node=None):

  """Checks that a remote command succeeds.

  @param cmd: either a string (the command to execute) or a list (to

      be converted using L{utils.ShellQuoteArgs} into a string)

  @type fail: boolean

  @param fail: if the command is expected to fail instead of succeeding

  @param node: if passed, it should be the node on which the command

      should be executed, instead of the master node (can be either a

      dict or a string)

  """

  if node is None:

    node = qa_config.GetMasterNode()

  if isinstance(node, basestring):

    nodename = node

  else:

    nodename = node["primary"]

  if isinstance(cmd, basestring):

    cmdstr = cmd

  else:

    cmdstr = utils.ShellQuoteArgs(cmd)

  rcode = StartSSH(nodename, cmdstr).wait()

  if fail:

    if rcode == 0:

      raise qa_error.Error("Command '%s' on node %s was expected to fail but"

                           " didn't" % (cmdstr, nodename))

  else:

    if rcode != 0:

      raise qa_error.Error("Command '%s' on node %s failed, exit code %s" %

                           (cmdstr, nodename, rcode))

def GetSSHCommand(node, cmd, strict=True):

  """Builds SSH command to be executed.

  Args:

  - node: Node the command should run on

  - cmd: Command to be executed as a list with all parameters

  - strict: Whether to enable strict host key checking

  """

  args = [ 'ssh', '-oEscapeChar=none', '-oBatchMode=yes', '-l', 'root', '-t' ]

  if strict:

    tmp = 'yes'

  else:

    tmp = 'no'

  args.append('-oStrictHostKeyChecking=%s' % tmp)

  args.append('-oClearAllForwardings=yes')

  args.append('-oForwardAgent=yes')

  args.append(node)

  args.append(cmd)

  return args

def StartLocalCommand(cmd, **kwargs):

  """Starts a local command.

  """

  print "Command: %s" % utils.ShellQuoteArgs(cmd)

  return subprocess.Popen(cmd, shell=False, **kwargs)

def StartSSH(node, cmd, strict=True):

  """Starts SSH.

  """

  return StartLocalCommand(GetSSHCommand(node, cmd, strict=strict))

def GetCommandOutput(node, cmd):

  """Returns the output of a command executed on the given node.

  """

  p = StartLocalCommand(GetSSHCommand(node, cmd), stdout=subprocess.PIPE)

  AssertEqual(p.wait(), 0)

  return p.stdout.read()

def UploadFile(node, src):

  """Uploads a file to a node and returns the filename.

  Caller needs to remove the returned file on the node when it's not needed

  anymore.

  """

  # Make sure nobody else has access to it while preserving local permissions

  mode = os.stat(src).st_mode & 0700

  cmd = ('tmp=$(tempfile --mode %o --prefix gnt) && '

         '[[ -f "${tmp}" ]] && '

         'cat > "${tmp}" && '

         'echo "${tmp}"') % mode

  f = open(src, 'r')

  try:

    p = subprocess.Popen(GetSSHCommand(node, cmd), shell=False, stdin=f,

                         stdout=subprocess.PIPE)

    AssertEqual(p.wait(), 0)

    # Return temporary filename

    return p.stdout.read().strip()

  finally:

    f.close()

def BackupFile(node, path):

  """Creates a backup of a file on the node and returns the filename.

  Caller needs to remove the returned file on the node when it's not needed

  anymore.

  """

  cmd = ("tmp=$(tempfile --prefix .gnt --directory=$(dirname %s)) && "

         "[[ -f \"$tmp\" ]] && "

         "cp %s $tmp && "

         "echo $tmp") % (utils.ShellQuote(path), utils.ShellQuote(path))

  # Return temporary filename

  return GetCommandOutput(node, cmd).strip()

def _ResolveName(cmd, key):

  """Helper function.

  """

  master = qa_config.GetMasterNode()

  output = GetCommandOutput(master['primary'], utils.ShellQuoteArgs(cmd))

  for line in output.splitlines():

    (lkey, lvalue) = line.split(':', 1)

    if lkey == key:

      return lvalue.lstrip()

  raise KeyError("Key not found")

def ResolveInstanceName(instance):

  """Gets the full name of an instance.

  @type instance: string

  @param instance: Instance name

  """

  return _ResolveName(['gnt-instance', 'info', instance],

                      'Instance name')

def ResolveNodeName(node):

  """Gets the full name of a node.

  """

  return _ResolveName(['gnt-node', 'info', node['primary']],

                      'Node name')

def GetNodeInstances(node, secondaries=False):

  """Gets a list of instances on a node.

  """

  master = qa_config.GetMasterNode()

  node_name = ResolveNodeName(node)

  # Get list of all instances

  cmd = ['gnt-instance', 'list', '--separator=:', '--no-headers',

         '--output=name,pnode,snodes']

  output = GetCommandOutput(master['primary'], utils.ShellQuoteArgs(cmd))

  instances = []

  for line in output.splitlines():

    (name, pnode, snodes) = line.split(':', 2)

    if ((not secondaries and pnode == node_name) or

        (secondaries and node_name in snodes.split(','))):

      instances.append(name)

  return instances

def _FormatWithColor(text, seq):

  if not seq:

    return text

  return "%s%s%s" % (seq, text, _RESET_SEQ)

FormatWarning = lambda text: _FormatWithColor(text, _WARNING_SEQ)

FormatError = lambda text: _FormatWithColor(text, _ERROR_SEQ)

FormatInfo = lambda text: _FormatWithColor(text, _INFO_SEQ)