Source code for pywws.livelogdaemon
#!/usr/bin/env python
# pywws - Python software for USB Wireless Weather Stations
# http://github.com/jim-easterbrook/pywws
# Copyright (C) 2008-14 Jim Easterbrook jim@jim-easterbrook.me.uk
# 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.
"""Run 'live logging' as a UNIX daemon.
This script can also be run with the ``pywws-livelog-daemon`` command. ::
%s
Requires the python-daemon library.
If you get a "function() argument 1 must be code, not str" error, try
installing python-daemon from PyPI instead of your Linux repos.
For more information on 'live logging' see :doc:`../guides/livelogging`.
"""
from __future__ import absolute_import
__docformat__ = "restructuredtext en"
__usage__ = """
usage: %s [options] data_dir log_file start|stop|restart
options are:
-h or --help display this help
-p file or --pid file store pid in 'file' (default /run/lock/pywws.pid)
-v or --verbose increase amount of logging messages
data_dir is the root directory of the weather data (e.g. /data/weather)
log_file is a file to write logging to, e.g. /var/log/pywws.log
"""
__doc__ %= __usage__ % ('python -m pywws.livelogdaemon')
from daemon.runner import DaemonRunner
import getopt
import os
import sys
from .LiveLog import LiveLog
from .Logger import ApplicationLogger
[docs]class Runner(DaemonRunner):
def __init__(self, data_dir, action, files_preserve, pid_file):
self.data_dir = os.path.abspath(data_dir)
# attributes required by daemon runner
self.stdin_path = '/dev/null'
self.stdout_path = '/dev/null'
self.stderr_path = '/dev/null'
self.pidfile_path = pid_file
self.pidfile_timeout = 5
# initialise daemon runner
DaemonRunner.__init__(self, self)
self.daemon_context.files_preserve = files_preserve
self.action = action
[docs] def parse_args(self, argv=None):
# don't let daemon runner do its own command line parsing
pass
[docs] def run(self):
LiveLog(self.data_dir)
[docs]def main(argv=None):
if argv is None:
argv = sys.argv
usage = (__usage__ % (argv[0])).strip()
try:
opts, args = getopt.getopt(
argv[1:], "hp:v", ['help', 'pid=', 'verbose'])
except getopt.error, msg:
print >>sys.stderr, 'Error: %s\n' % msg
print >>sys.stderr, usage
return 1
# process options
pid_file = '/run/lock/pywws.pid'
verbose = 0
for o, a in opts:
if o in ('-h', '--help'):
print __doc__.split('\n\n')[0]
print usage
return 0
elif o in ('-p', '--pid'):
pid_file = a
elif o in ('-v', '--verbose'):
verbose += 1
# check arguments
if len(args) != 3:
print >>sys.stderr, 'Error: 3 arguments required\n'
print >>sys.stderr, usage
return 2
logger = ApplicationLogger(verbose, args[1])
runner = Runner(
args[0], args[2], map(lambda x: x.stream, logger.handlers), pid_file)
try:
runner.do_action()
except Exception, ex:
logger.exception(ex)
return 3
return 0
if __name__ == "__main__":
sys.exit(main())