Synnefo » snf-ganeti

#

#

# Copyright (C) 2006, 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.

"""Logging for Ganeti

This module abstracts the logging handling away from the rest of the

Ganeti code. It offers some utility functions for easy logging.

"""

# pylint: disable-msg=W0603,C0103

import sys

import logging

import os, os.path

from ganeti import constants

def _CreateFileHandler(name):

  return logging.FileHandler(os.path.join(constants.LOG_DIR, name))

def SetupLogging(program='ganeti', debug=False):

  """Setup logging for ganeti

  On failure, a check is made whether process is run by root or not,

  and an appropriate error message is printed on stderr, then process

  exits.

  Args:

    debug: Whether to enable verbose logging

    program: Program name

  """

  fmt = "%(asctime)s " + program + ": %(message)s"

  formatter = logging.Formatter(fmt)

  stderr_fmt = "%(asctime)s: %(message)s"

  stderr_formatter = logging.Formatter(stderr_fmt)

  info_file = _CreateFileHandler("info")

  info_file.setLevel(logging.INFO)

  info_file.setFormatter(formatter)

  errors_file = _CreateFileHandler("errors")

  errors_file.setLevel(logging.ERROR)

  errors_file.setFormatter(formatter)

  debug_file = _CreateFileHandler("debug")

  debug_file.setLevel(logging.DEBUG)

  debug_file.setFormatter(formatter)

  stderr_file = logging.StreamHandler()

  stderr_file.setFormatter(stderr_formatter)

  if debug:

    stderr_file.setLevel(logging.NOTSET)

  else:

    stderr_file.setLevel(logging.ERROR)

  root_logger = logging.getLogger("")

  root_logger.setLevel(logging.NOTSET)

  root_logger.addHandler(info_file)

  root_logger.addHandler(errors_file)

  root_logger.addHandler(debug_file)

  root_logger.addHandler(stderr_file)

def SetupDaemon(logfile, debug=False):

  """Configures the logging module for daemons

  """

  if debug:

    fmt = "%(asctime)s: %(levelname)s %(pathname)s:%(lineno)s %(message)s"

  else:

    fmt = "%(asctime)s: %(levelname)s %(message)s"

  formatter = logging.Formatter(fmt)

  logfile_handler = logging.FileHandler(logfile)

  logfile_handler.setFormatter(formatter)

  stderr_handler = logging.StreamHandler()

  stderr_handler.setFormatter(formatter)

  if debug:

    logfile_handler.setLevel(logging.DEBUG)

    stderr_handler.setLevel(logging.NOTSET)

  else:

    logfile_handler.setLevel(logging.INFO)

    stderr_handler.setLevel(logging.CRITICAL)

  root_logger = logging.getLogger("")

  root_logger.setLevel(logging.NOTSET)

  root_logger.addHandler(logfile_handler)

  root_logger.addHandler(stderr_handler)

# Backwards compatibility

Error = logging.error

Info = logging.info

Debug = logging.debug

def ToStdout(txt):

  """Write a message to stdout only, bypassing the logging system

  Parameters:

    - txt: the message

  """

  sys.stdout.write(txt + '\n')

  sys.stdout.flush()

def ToStderr(txt):

  """Write a message to stderr only, bypassing the logging system

  Parameters:

    - txt: the message

  """

  sys.stderr.write(txt + '\n')

  sys.stderr.flush()