#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

#    Copyright 2011 OpenStack LLC
#
#    Licensed 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 eventlet
eventlet.monkey_patch()

import contextlib
import os
import sys

from oslo.config import cfg
import zmq

# If ../nova/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
    sys.path.insert(0, POSSIBLE_TOPDIR)

from nova import config
from nova import exception
from nova.openstack.common import log as logging
from nova.openstack.common import rpc
from nova.openstack.common.rpc import impl_zmq
from nova import utils

CONF = cfg.CONF
CONF.register_opts(rpc.rpc_opts)
CONF.register_opts(impl_zmq.zmq_opts)


def main():
    config.parse_args(sys.argv)
    logging.setup("nova")
    utils.monkey_patch()

    ipc_dir = CONF.rpc_zmq_ipc_dir

    # Create the necessary directories/files for this service.
    if not os.path.isdir(ipc_dir):
        try:
            utils.execute('mkdir', '-p', ipc_dir, run_as_root=True)
            utils.execute('chown', "%s:%s" % (os.getuid(), os.getgid()),
                          ipc_dir, run_as_root=True)
            utils.execute('chmod', '750', ipc_dir, run_as_root=True)
        except exception.ProcessExecutionError:
            logging.error(_("Could not create IPC socket directory."))
            return

    with contextlib.closing(impl_zmq.ZmqProxy(CONF)) as reactor:
        consume_in = "tcp://%s:%s" % \
            (CONF.rpc_zmq_bind_address,
             CONF.rpc_zmq_port)
        consumption_proxy = impl_zmq.InternalContext(None)

        reactor.register(consumption_proxy,
                         consume_in, zmq.PULL, out_bind=True)

        reactor.consume_in_thread()
        reactor.wait()

if __name__ == '__main__':
    main()