#!/usr/bin/python
#

# Copyright (C) 2010 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.


"""Script for testing tools/cfgupgrade"""

import os
import sys
import unittest
import shutil
import tempfile
import operator

from ganeti import constants
from ganeti import utils
from ganeti import errors
from ganeti import serializer

import testutils


def _RunUpgrade(path, dry_run, no_verify):
  cmd = [sys.executable, "%s/tools/cfgupgrade" % testutils.GetSourceDir(),
         "--debug", "--force", "--path=%s" % path]
  if dry_run:
    cmd.append("--dry-run")
  if no_verify:
    cmd.append("--no-verify")

  result = utils.RunCmd(cmd, cwd=os.getcwd())
  if result.failed:
    raise Exception("cfgupgrade failed: %s, output %r" %
                    (result.fail_reason, result.output))


class TestCfgupgrade(unittest.TestCase):
  def setUp(self):
    self.tmpdir = tempfile.mkdtemp()

    self.config_path = utils.PathJoin(self.tmpdir, "config.data")
    self.noded_cert_path = utils.PathJoin(self.tmpdir, "server.pem")
    self.rapi_cert_path = utils.PathJoin(self.tmpdir, "rapi.pem")
    self.known_hosts_path = utils.PathJoin(self.tmpdir, "known_hosts")
    self.confd_hmac_path = utils.PathJoin(self.tmpdir, "hmac.key")
    self.cds_path = utils.PathJoin(self.tmpdir, "cluster-domain-secret")

  def tearDown(self):
    shutil.rmtree(self.tmpdir)

  def _LoadConfig(self):
    return serializer.LoadJson(utils.ReadFile(self.config_path))

  def _CreateValidConfigDir(self):
    utils.WriteFile(self.noded_cert_path, data="")
    utils.WriteFile(self.known_hosts_path, data="")

  def testNoConfigDir(self):
    self.assertFalse(utils.ListVisibleFiles(self.tmpdir))
    self.assertRaises(Exception, _RunUpgrade, self.tmpdir, False, True)
    self.assertRaises(Exception, _RunUpgrade, self.tmpdir, True, True)

  def testInconsistentConfig(self):
    self._CreateValidConfigDir()
    # There should be no "config_version"
    cfg = {
      "version": 0,
      "cluster": {
        "config_version": 0,
        },
      }
    utils.WriteFile(self.config_path, data=serializer.DumpJson(cfg))
    self.assertRaises(Exception, _RunUpgrade, self.tmpdir, False, True)

  def testInvalidConfig(self):
    self._CreateValidConfigDir()
    # Missing version from config
    utils.WriteFile(self.config_path, data=serializer.DumpJson({}))
    self.assertRaises(Exception, _RunUpgrade, self.tmpdir, False, True)

  def _TestSimpleUpgrade(self, from_version, dry_run):
    cfg = {
      "version": from_version,
      "cluster": {},
      }
    self._CreateValidConfigDir()
    utils.WriteFile(self.config_path, data=serializer.DumpJson(cfg))

    self.assertFalse(os.path.isfile(self.rapi_cert_path))
    self.assertFalse(os.path.isfile(self.confd_hmac_path))
    self.assertFalse(os.path.isfile(self.cds_path))

    _RunUpgrade(self.tmpdir, dry_run, True)

    if dry_run:
      expversion = from_version
      checkfn = operator.not_
    else:
      expversion = constants.CONFIG_VERSION
      checkfn = operator.truth

    self.assert_(checkfn(os.path.isfile(self.rapi_cert_path)))
    self.assert_(checkfn(os.path.isfile(self.confd_hmac_path)))
    self.assert_(checkfn(os.path.isfile(self.cds_path)))

    newcfg = self._LoadConfig()
    self.assertEqual(newcfg["version"], expversion)

  def testUpgradeFrom_2_0(self):
    self._TestSimpleUpgrade(constants.BuildVersion(2, 0, 0), False)

  def testUpgradeFrom_2_1(self):
    self._TestSimpleUpgrade(constants.BuildVersion(2, 1, 0), False)

  def testUpgradeCurrent(self):
    self._TestSimpleUpgrade(constants.CONFIG_VERSION, False)

  def testUpgradeDryRunFrom_2_0(self):
    self._TestSimpleUpgrade(constants.BuildVersion(2, 0, 0), True)

  def testUpgradeDryRunFrom_2_1(self):
    self._TestSimpleUpgrade(constants.BuildVersion(2, 1, 0), True)

  def testUpgradeCurrentDryRun(self):
    self._TestSimpleUpgrade(constants.CONFIG_VERSION, True)


if __name__ == "__main__":
  testutils.GanetiTestProgram()