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# -*- coding: utf-8 -*-
##############################################################################
#
# Copyright (c) 2010 Vifib SARL and Contributors. All Rights Reserved.
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly adviced to contract a Free Software
# Service Company
#
# 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 3
# 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.
#
##############################################################################
import argparse
import errno
import gdbm
import json
import logging
import logging.handlers
import os
import signal
import socket
import subprocess
import sys
import SocketServer
import StringIO
import threading
# I think this is obvious enough to not require any documentation, but I might
# be wrong.
class EqueueServer(SocketServer.ThreadingUnixStreamServer):
daemon_threads = True
def __init__(self, *args, **kw):
self.options = kw.pop('equeue_options')
SocketServer.ThreadingUnixStreamServer.__init__(self,
RequestHandlerClass=None,
*args, **kw)
# Equeue Specific elements
self.setLogger(self.options.logfile[0], self.options.loglevel[0])
self.setDB(self.options.database[0])
# Lock to only have one command running at the time
self.lock = threading.Lock()
def setLogger(self, logfile, loglevel):
self.logger = logging.getLogger("EQueue")
handler = logging.handlers.WatchedFileHandler(logfile, mode='a')
# Natively support logrotate
level = logging._levelNames.get(loglevel, logging.INFO)
self.logger.setLevel(level)
formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
handler.setFormatter(formatter)
self.logger.addHandler(handler)
def setDB(self, database):
self.db = gdbm.open(database, 'cs', 0700)
def process_request_thread(self, request, client_address):
# Handle request
self.logger.debug("Connection with file descriptor %d", request.fileno())
request.settimeout(self.options.timeout)
request_string = StringIO.StringIO()
segment = None
try:
while segment != '':
segment = request.recv(1024)
request_string.write(segment)
except socket.timeout:
pass
command = '127'
try:
request_parameters = json.loads(request_string.getvalue())
timestamp = request_parameters['timestamp']
command = str(request_parameters['command'])
self.logger.info("New command %r at %s", command, timestamp)
except (ValueError, IndexError) :
self.logger.warning("Error during the unserialization of json "
"message of %r file descriptor. The message "
"was %r", request.fileno(), request_string.getvalue())
try:
request.send(command)
except:
self.logger.warning("Couldn't respond to %r", request.fileno())
self.close_request(request)
# Run command if needed
with self.lock:
if command not in self.db or timestamp > int(self.db[command]):
self.logger.info("Running %s, %s", command, timestamp)
# XXX stdout and stderr redirected to null as they are not read
with open(os.devnull, 'r+') as f:
status = subprocess.call([command], close_fds=True,
stdin=f, stdout=f, stderr=f)
if status:
self.logger.warning("%s finished with non zero status.",
command)
else:
self.logger.info("%s finished successfully.", command)
self.db[command] = timestamp
else:
self.logger.info("%s already runned.", command)
# Well the following function is made for schrodinger's files,
# It will work if the file exists or not
def remove_existing_file(path):
try:
os.remove(path)
except OSError, e:
if e.errno != errno.ENOENT:
raise
def main():
parser = argparse.ArgumentParser(
description="Run a single threaded execution queue.")
parser.add_argument('--database', nargs=1, required=True,
help="Path to the database where the last "
"calls are stored")
parser.add_argument('--loglevel', nargs=1,
default='INFO',
choices=[i for i in logging._levelNames
if isinstance(i, str)],
required=False)
parser.add_argument('-l', '--logfile', nargs=1, required=True,
help="Path to the log file.")
parser.add_argument('-t', '--timeout', nargs=1, required=False,
dest='timeout', type=int, default=3)
parser.add_argument('socket', help="Path to the unix socket")
args = parser.parse_args()
socketpath = args.socket
signal.signal(signal.SIGHUP, lambda *args: sys.exit(-1))
signal.signal(signal.SIGTERM, lambda *args: sys.exit())
remove_existing_file(socketpath)
try:
server = EqueueServer(socketpath, **{'equeue_options':args})
server.logger.info("Starting server on %r", socketpath)
server.serve_forever()
finally:
remove_existing_file(socketpath)
os.kill(0, 9)
if __name__ == '__main__':
main()