#!/usr/bin/python
#

# Copyright (C) 2012 Google Inc.
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"""Script for testing ganeti.ssconf"""

import os
import unittest
import tempfile
import shutil
import errno

from ganeti import utils
from ganeti import constants
from ganeti import errors
from ganeti import ssconf

import testutils
import mock


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

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

  def testReadDirectory(self):
    self.assertRaises(EnvironmentError, ssconf.ReadSsconfFile, self.tmpdir)

  def testNonExistantFile(self):
    testfile = utils.PathJoin(self.tmpdir, "does.not.exist")

    self.assertFalse(os.path.exists(testfile))

    try:
      ssconf.ReadSsconfFile(testfile)
    except EnvironmentError, err:
      self.assertEqual(err.errno, errno.ENOENT)
    else:
      self.fail("Exception was not raised")

  def testEmptyFile(self):
    testfile = utils.PathJoin(self.tmpdir, "empty")

    utils.WriteFile(testfile, data="")

    self.assertEqual(ssconf.ReadSsconfFile(testfile), "")

  def testSingleLine(self):
    testfile = utils.PathJoin(self.tmpdir, "data")

    for nl in range(0, 10):
      utils.WriteFile(testfile, data="Hello World" + ("\n" * nl))

      self.assertEqual(ssconf.ReadSsconfFile(testfile),
                       "Hello World")

  def testExactlyMaxSize(self):
    testfile = utils.PathJoin(self.tmpdir, "data")

    data = "A" * ssconf._MAX_SIZE
    utils.WriteFile(testfile, data=data)

    self.assertEqual(os.path.getsize(testfile), ssconf._MAX_SIZE)

    self.assertEqual(ssconf.ReadSsconfFile(testfile),
                     data)

  def testLargeFile(self):
    testfile = utils.PathJoin(self.tmpdir, "data")

    for size in [ssconf._MAX_SIZE + 1, ssconf._MAX_SIZE * 2]:
      utils.WriteFile(testfile, data="A" * size)
      self.assertTrue(os.path.getsize(testfile) > ssconf._MAX_SIZE)
      self.assertRaises(RuntimeError, ssconf.ReadSsconfFile, testfile)


class TestSimpleStore(unittest.TestCase):
  def setUp(self):
    self._tmpdir = tempfile.mkdtemp()
    self.ssdir = utils.PathJoin(self._tmpdir, "files")
    lockfile = utils.PathJoin(self._tmpdir, "lock")

    os.mkdir(self.ssdir)

    self.sstore = ssconf.SimpleStore(cfg_location=self.ssdir,
                                     _lockfile=lockfile)

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

  def _ReadSsFile(self, filename):
    return utils.ReadFile(utils.PathJoin(self.ssdir, "ssconf_%s" % filename))

  def testInvalidKey(self):
    self.assertRaises(errors.ProgrammerError, self.sstore.KeyToFilename,
                      "not a valid key")
    self.assertRaises(errors.ProgrammerError, self.sstore._ReadFile,
                      "not a valid key")

  def testKeyToFilename(self):
    for key in ssconf._VALID_KEYS:
      result = self.sstore.KeyToFilename(key)
      self.assertTrue(utils.IsBelowDir(self.ssdir, result))
      self.assertTrue(os.path.basename(result).startswith("ssconf_"))

  def testReadFileNonExistingFile(self):
    filename = self.sstore.KeyToFilename(constants.SS_CLUSTER_NAME)

    self.assertFalse(os.path.exists(filename))
    try:
      self.sstore._ReadFile(constants.SS_CLUSTER_NAME)
    except errors.ConfigurationError, err:
      self.assertTrue(str(err).startswith("Can't read ssconf file"))
    else:
      self.fail("Exception was not raised")

    for default in ["", "Hello World", 0, 100]:
      self.assertFalse(os.path.exists(filename))
      result = self.sstore._ReadFile(constants.SS_CLUSTER_NAME, default=default)
      self.assertEqual(result, default)

  def testReadFile(self):
    utils.WriteFile(self.sstore.KeyToFilename(constants.SS_CLUSTER_NAME),
                    data="cluster.example.com")

    self.assertEqual(self.sstore._ReadFile(constants.SS_CLUSTER_NAME),
                     "cluster.example.com")

    self.assertEqual(self.sstore._ReadFile(constants.SS_CLUSTER_NAME,
                                           default="something.example.com"),
                     "cluster.example.com")

  def testReadAllNoFiles(self):
    self.assertEqual(self.sstore.ReadAll(), {})

  def testReadAllSingleFile(self):
    utils.WriteFile(self.sstore.KeyToFilename(constants.SS_CLUSTER_NAME),
                    data="cluster.example.com")
    self.assertEqual(self.sstore.ReadAll(), {
      constants.SS_CLUSTER_NAME: "cluster.example.com",
      })

  def testWriteFiles(self):
    values = {
      constants.SS_CLUSTER_NAME: "cluster.example.com",
      constants.SS_CLUSTER_TAGS: "value\nwith\nnewlines\n",
      constants.SS_INSTANCE_LIST: "",
      }

    self.sstore.WriteFiles(values)

    self.assertEqual(sorted(os.listdir(self.ssdir)), sorted([
      "ssconf_cluster_name",
      "ssconf_cluster_tags",
      "ssconf_instance_list",
      ]))

    self.assertEqual(self._ReadSsFile(constants.SS_CLUSTER_NAME),
                     "cluster.example.com\n")
    self.assertEqual(self._ReadSsFile(constants.SS_CLUSTER_TAGS),
                     "value\nwith\nnewlines\n")
    self.assertEqual(self._ReadSsFile(constants.SS_INSTANCE_LIST), "")

  def testWriteFilesUnknownKey(self):
    values = {
      "unknown key": "value",
      }

    self.assertRaises(errors.ProgrammerError, self.sstore.WriteFiles,
                      values, dry_run=True)

    self.assertEqual(os.listdir(self.ssdir), [])

  def testWriteFilesDryRun(self):
    values = {
      constants.SS_CLUSTER_NAME: "cluster.example.com",
      }

    self.sstore.WriteFiles(values, dry_run=True)

    self.assertEqual(os.listdir(self.ssdir), [])

  def testWriteFilesNoValues(self):
    for dry_run in [False, True]:
      self.sstore.WriteFiles({}, dry_run=dry_run)

      self.assertEqual(os.listdir(self.ssdir), [])

  def testWriteFilesTooLong(self):
    values = {
      constants.SS_INSTANCE_LIST: "A" * ssconf._MAX_SIZE,
      }

    for dry_run in [False, True]:
      try:
        self.sstore.WriteFiles(values, dry_run=dry_run)
      except errors.ConfigurationError, err:
        self.assertTrue(str(err).startswith("Value 'instance_list' has"))
      else:
        self.fail("Exception was not raised")

      self.assertEqual(os.listdir(self.ssdir), [])

  def testGetHvparamsForHypervisor(self):
    hvparams = [("a", "A"), ("b", "B"), ("c", "C")]
    ssconf_file_content = '\n'.join("%s=%s" % (key, value) for (key, value)
                                    in hvparams)
    self.sstore._ReadFile = mock.Mock(return_value=ssconf_file_content)
    result = self.sstore.GetHvparamsForHypervisor("foo")
    for (key, value) in hvparams:
      self.assertTrue(key in result)
      self.assertEqual(value, result[key])


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

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

  def testMissingFile(self):
    tmploc = utils.PathJoin(self.tmpdir, "does-not-exist")
    ssconf.VerifyClusterName(NotImplemented, _cfg_location=tmploc)

  def testMatchingName(self):
    tmpfile = utils.PathJoin(self.tmpdir, "ssconf_cluster_name")

    for content in ["cluster.example.com", "cluster.example.com\n\n"]:
      utils.WriteFile(tmpfile, data=content)
      ssconf.VerifyClusterName("cluster.example.com",
                               _cfg_location=self.tmpdir)

  def testNameMismatch(self):
    tmpfile = utils.PathJoin(self.tmpdir, "ssconf_cluster_name")

    for content in ["something.example.com", "foobar\n\ncluster.example.com"]:
      utils.WriteFile(tmpfile, data=content)
      self.assertRaises(errors.GenericError, ssconf.VerifyClusterName,
                        "cluster.example.com", _cfg_location=self.tmpdir)


class TestVerifyKeys(unittest.TestCase):
  def testNoKeys(self):
    ssconf.VerifyKeys({})

  def testValidKeys(self):
    ssconf.VerifyKeys(ssconf._VALID_KEYS)

    for key in ssconf._VALID_KEYS:
      ssconf.VerifyKeys([key])

  def testInvalidKeys(self):
    for key in ["", ".", " ", "foo", "bar", "HelloWorld"]:
      self.assertRaises(errors.GenericError, ssconf.VerifyKeys, [key])


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