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#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#============================================================================
# Copyright (C) 2004, 2005 Mike Wray <mike.wray@hp.com>
# Copyright (C) 2005, 2006 XenSource Ltd.
#============================================================================
import tempfile
import types
import logging
import logging.handlers
import fcntl
from xen.xend.server import params
__all__ = [ 'log', 'init', 'getLogFilename' ]
if 'TRACE' not in logging.__dict__:
logging.TRACE = logging.DEBUG - 1
logging.addLevelName(logging.TRACE,'TRACE')
def trace(self, *args, **kwargs):
self.log(logging.TRACE, *args, **kwargs)
logging.Logger.trace = trace
log = logging.getLogger("xend")
MAX_BYTES = 1 << 20 # 1MB
BACKUP_COUNT = 5
STDERR_FORMAT = "[%(name)s] %(levelname)s (%(module)s:%(lineno)d) %(message)s"
LOGFILE_FORMAT = "[%(asctime)s %(name)s %(process)d] %(levelname)s (%(module)s:%(lineno)d) %(message)s"
DATE_FORMAT = "%Y-%m-%d %H:%M:%S"
logfilename = None
class XendRotatingFileHandler(logging.handlers.RotatingFileHandler):
def __init__(self, fname, mode, maxBytes, backupCount):
logging.handlers.RotatingFileHandler.__init__(self, fname, mode, maxBytes, backupCount)
self.setCloseOnExec()
def doRollover(self):
logging.handlers.RotatingFileHandler.doRollover(self)
self.setCloseOnExec()
# NB yes accessing 'self.stream' violates OO encapsulation somewhat,
# but python logging API gives no other way to access the file handle
# and the entire python logging stack is already full of OO encapsulation
# violations. The other alternative is copy-and-paste duplicating the
# entire FileHandler, StreamHandler & RotatingFileHandler classes which
# is even worse
def setCloseOnExec(self):
flags = fcntl.fcntl(self.stream.fileno(), fcntl.F_GETFD)
flags |= fcntl.FD_CLOEXEC
fcntl.fcntl(self.stream.fileno(), fcntl.F_SETFD, flags)
def init(filename, level):
"""Initialise logging. Logs to the given filename, and logs to stderr if
XEND_DEBUG is set.
"""
global logfilename
def openFileHandler(fname):
return XendRotatingFileHandler(fname, mode = 'a',
maxBytes = MAX_BYTES,
backupCount = BACKUP_COUNT)
# Rather unintuitively, getLevelName will get the number corresponding to
# a level name, as well as getting the name corresponding to a level
# number. setLevel seems to take the number only though, so convert if we
# are given a string.
if isinstance(level, types.StringType):
level = logging.getLevelName(level)
log.setLevel(level)
try:
fileHandler = openFileHandler(filename)
logfilename = filename
except IOError:
logfilename = tempfile.mkstemp("-xend.log")[1]
fileHandler = openFileHandler(logfilename)
fileHandler.setFormatter(logging.Formatter(LOGFILE_FORMAT, DATE_FORMAT))
log.addHandler(fileHandler)
if params.XEND_DEBUG:
stderrHandler = logging.StreamHandler()
stderrHandler.setFormatter(logging.Formatter(STDERR_FORMAT,
DATE_FORMAT))
log.addHandler(stderrHandler)
def getLogFilename():
return logfilename
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