# Copyright (C) 1998,1999,2000,2001,2002 by the Free Software Foundation, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""File-based logger, writes to named category files in mm_cfg.LOG_DIR."""
import sys
import os
import codecs
from types import StringType
from Mailman import mm_cfg
from Mailman.Logging.Utils import _logexc
# Set this to the encoding to be used for your log file output. If set to
# None, then it uses your system's default encoding. Otherwise, it must be an
# encoding string appropriate for codecs.open().
LOG_ENCODING = 'iso-8859-1'
class Logger:
def __init__(self, category, nofail=1, immediate=0):
"""nofail says to fallback to sys.__stderr__ if write fails to
category file - a complaint message is emitted, but no exception is
raised. Set nofail=0 if you want to handle the error in your code,
instead.
immediate=1 says to create the log file on instantiation.
Otherwise, the file is created only when there are writes pending.
"""
self.__filename = os.path.join(mm_cfg.LOG_DIR, category)
self.__fp = None
self.__nofail = nofail
self.__encoding = LOG_ENCODING or sys.getdefaultencoding()
if immediate:
self.__get_f()
def __del__(self):
self.close()
def __repr__(self):
return '<%s to %s>' % (self.__class__.__name__, `self.__filename`)
def __get_f(self):
if self.__fp:
return self.__fp
else:
try:
ou = os.umask(002)
try:
try:
f = codecs.open(
self.__filename, 'a+', self.__encoding, 'replace',
1)
except LookupError:
f = open(self.__filename, 'a+', 1)
self.__fp = f
finally:
os.umask(ou)
except IOError, e:
if self.__nofail:
_logexc(self, e)
f = self.__fp = sys.__stderr__
else:
raise
return f
def flush(self):
f = self.__get_f()
if hasattr(f, 'flush'):
f.flush()
def write(self, msg):
if isinstance(msg, StringType):
msg = unicode(msg, self.__encoding)
f = self.__get_f()
try:
f.write(msg)
except IOError, msg:
_logexc(self, msg)
def writelines(self, lines):
for l in lines:
self.write(l)
def close(self):
if not self.__fp:
return
self.__get_f().close()
self.__fp = None
