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

# Copyright [2010] [Anso Labs, 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.
"""
    Tornado Storage daemon manages AoE volumes via AMQP messaging.
"""

import logging

from nova import vendor
from tornado import ioloop

from nova import flags
from nova import rpc
from nova import server
from nova import utils
from nova.volume import storage


FLAGS = flags.FLAGS
flags.DEFINE_integer('storage_report_state_interval', 10,
                     'seconds between broadcasting state to cloud',
                     lower_bound=1)


def main(argv):
    bs = storage.BlockStore()

    conn = rpc.Connection.instance()
    consumer_all = rpc.AdapterConsumer(
            connection=conn,
            topic='%s' % FLAGS.storage_topic,
            proxy=bs)

    consumer_node = rpc.AdapterConsumer(
            connection=conn,
            topic='%s.%s' % (FLAGS.storage_topic, FLAGS.node_name),
            proxy=bs)

    io_inst = ioloop.IOLoop.instance()
    scheduler = ioloop.PeriodicCallback(
            lambda: bs.report_state(),
            FLAGS.storage_report_state_interval * 1000,
            io_loop=io_inst)

    injected = consumer_all.attachToTornado(io_inst)
    injected = consumer_node.attachToTornado(io_inst)
    scheduler.start()
    io_inst.start()


if __name__ == '__main__':
    utils.default_flagfile()
    server.serve('nova-volume', main)