#!/usr/bin/env python

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.    

import os
import sys
import time
import logging.config

from tashi.util import boolean, instantiateImplementation, getConfig, debugConsole
import tashi

from tashi.rpycservices import rpycservices
from rpyc.utils.server import ThreadedServer
from rpyc.utils.authenticators import TlsliteVdbAuthenticator

log = None

def startClusterManager(config):
	global service, data
	
	dfs = instantiateImplementation(config.get("ClusterManager", "dfs"), config)
	data = instantiateImplementation(config.get("ClusterManager", "data"), config)
	service = instantiateImplementation(config.get("ClusterManager", "service"), config, data, dfs)

	if boolean(config.get("Security", "authAndEncrypt")):
		users = {}
		userDatabase = data.getUsers()
		for user in userDatabase.values():
			if user.passwd != None:
				users[user.name] = user.passwd
		users[config.get('AllowedUsers', 'nodeManagerUser')] = config.get('AllowedUsers', 'nodeManagerPassword')
		users[config.get('AllowedUsers', 'agentUser')] = config.get('AllowedUsers', 'agentPassword')
		authenticator = TlsliteVdbAuthenticator.from_dict(users)
		t = ThreadedServer(service=rpycservices.ManagerService, hostname='0.0.0.0', port=int(config.get('ClusterManagerService', 'port')), auto_register=False, authenticator=authenticator)
	else:
		t = ThreadedServer(service=rpycservices.ManagerService, hostname='0.0.0.0', port=int(config.get('ClusterManagerService', 'port')), auto_register=False)
	t.logger.setLevel(logging.ERROR)
	t.service.service = service
	t.service._type = 'ClusterManagerService'

	debugConsole(globals())

	t.start()
	# shouldn't exit by itself
	return

def main():
	global log
	
	# setup configuration and logging
	(config, configFiles) = getConfig(["ClusterManager"])
	publisher = instantiateImplementation(config.get("ClusterManager", "publisher"), config)
	tashi.publisher = publisher
	logging.config.fileConfig(configFiles)
	log = logging.getLogger(__file__)
	log.info('Using configuration file(s) %s' % configFiles)
	
	# bind the database
	log.info('Starting cluster manager')

	# handle keyboard interrupts (http://code.activestate.com/recipes/496735-workaround-for-missed-sigint-in-multithreaded-prog/)
	child = os.fork()

	if child == 0:
		startClusterManager(config)
		# shouldn't exit by itself
		sys.exit(0)

	else:
		# main
		try:
			os.waitpid(child, 0)
		except KeyboardInterrupt:
			log.info("Exiting cluster manager after receiving a SIGINT signal")
			os._exit(0)
		except Exception:
			log.exception("Abnormal termination of cluster manager")
			os._exit(-1)

		log.info("Exiting cluster manager after service thread exited")
		os._exit(-1)

	return


if __name__ == "__main__":
	main()