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#!/usr/bin/python

#

# Copyright (C) 2011 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 ganeti.utils.log"""

import os

import unittest

import logging

import tempfile

import shutil

from ganeti import constants

from ganeti import errors

from ganeti import utils

import testutils

class TestLogHandler(unittest.TestCase):

  def test(self):

    tmpfile = tempfile.NamedTemporaryFile()

    handler = utils.log._ReopenableLogHandler(tmpfile.name)

    handler.setFormatter(logging.Formatter("%(asctime)s: %(message)s"))

    logger = logging.Logger("TestLogger")

    logger.addHandler(handler)

    self.assertEqual(len(logger.handlers), 1)

    logger.error("Test message ERROR")

    logger.info("Test message INFO")

    logger.removeHandler(handler)

    self.assertFalse(logger.handlers)

    handler.close()

    self.assertEqual(len(utils.ReadFile(tmpfile.name).splitlines()), 2)

  def testReopen(self):

    tmpfile = tempfile.NamedTemporaryFile()

    tmpfile2 = tempfile.NamedTemporaryFile()

    handler = utils.log._ReopenableLogHandler(tmpfile.name)

    self.assertFalse(utils.ReadFile(tmpfile.name))

    self.assertFalse(utils.ReadFile(tmpfile2.name))

    logger = logging.Logger("TestLoggerReopen")

    logger.addHandler(handler)

    for _ in range(3):

      logger.error("Test message ERROR")

    handler.flush()

    self.assertEqual(len(utils.ReadFile(tmpfile.name).splitlines()), 3)

    before_id = utils.GetFileID(tmpfile.name)

    handler.RequestReopen()

    self.assertTrue(handler._reopen)

    self.assertTrue(utils.VerifyFileID(utils.GetFileID(tmpfile.name),

                                       before_id))

    # Rename only after requesting reopen

    os.rename(tmpfile.name, tmpfile2.name)

    assert not os.path.exists(tmpfile.name)

    # Write another message, should reopen

    for _ in range(4):

      logger.info("Test message INFO")

      self.assertFalse(utils.VerifyFileID(utils.GetFileID(tmpfile.name),

                                          before_id))

    logger.removeHandler(handler)

    self.assertFalse(logger.handlers)

    handler.close()

    self.assertEqual(len(utils.ReadFile(tmpfile.name).splitlines()), 4)

    self.assertEqual(len(utils.ReadFile(tmpfile2.name).splitlines()), 3)

  def testConsole(self):

    for (console, check) in [(None, False),

                             (tempfile.NamedTemporaryFile(), True),

                             (self._FailingFile(os.devnull), False)]:

      # Create a handler which will fail when handling errors

      cls = utils.log._LogErrorsToConsole(self._FailingHandler)

      # Instantiate handler with file which will fail when writing,

      # provoking a write to the console

      handler = cls(console, self._FailingFile(os.devnull))

      logger = logging.Logger("TestLogger")

      logger.addHandler(handler)

      self.assertEqual(len(logger.handlers), 1)

      # Provoke write

      logger.error("Test message ERROR")

      # Take everything apart

      logger.removeHandler(handler)

      self.assertFalse(logger.handlers)

      handler.close()

      if console and check:

        console.flush()

        # Check console output

        consout = utils.ReadFile(console.name)

        self.assertTrue("Cannot log message" in consout)

        self.assertTrue("Test message ERROR" in consout)

  class _FailingFile(file):

    def write(self, _):

      raise Exception

  class _FailingHandler(logging.StreamHandler):

    def handleError(self, _):

      raise Exception

class TestSetupLogging(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def testSimple(self):

    logfile = utils.PathJoin(self.tmpdir, "basic.log")

    logger = logging.Logger("TestLogger")

    self.assertTrue(callable(utils.SetupLogging(logfile, "test",

                                                console_logging=False,

                                                syslog=constants.SYSLOG_NO,

                                                stderr_logging=False,

                                                multithreaded=False,

                                                root_logger=logger)))

    self.assertEqual(utils.ReadFile(logfile), "")

    logger.error("This is a test")

    # Ensure SetupLogging used custom logger

    logging.error("This message should not show up in the test log file")

    self.assertTrue(utils.ReadFile(logfile).endswith("This is a test\n"))

  def testReopen(self):

    logfile = utils.PathJoin(self.tmpdir, "reopen.log")

    logfile2 = utils.PathJoin(self.tmpdir, "reopen.log.OLD")

    logger = logging.Logger("TestLogger")

    reopen_fn = utils.SetupLogging(logfile, "test",

                                   console_logging=False,

                                   syslog=constants.SYSLOG_NO,

                                   stderr_logging=False,

                                   multithreaded=False,

                                   root_logger=logger)

    self.assertTrue(callable(reopen_fn))

    self.assertEqual(utils.ReadFile(logfile), "")

    logger.error("This is a test")

    self.assertTrue(utils.ReadFile(logfile).endswith("This is a test\n"))

    os.rename(logfile, logfile2)

    assert not os.path.exists(logfile)

    # Notify logger to reopen on the next message

    reopen_fn()

    assert not os.path.exists(logfile)

    # Provoke actual reopen

    logger.error("First message")

    self.assertTrue(utils.ReadFile(logfile).endswith("First message\n"))

    self.assertTrue(utils.ReadFile(logfile2).endswith("This is a test\n"))

if __name__ == "__main__":

  testutils.GanetiTestProgram()