# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""Pyro RQL server"""

__docformat__ = "restructuredtext en"

import select

from time import localtime, mktime

from cubicweb.server.utils import TasksManager

from cubicweb.server.repository import Repository

class Finished(Exception):

    """raise to remove an event from the event loop"""

class TimeEvent:

    """base event"""

    # timefunc = staticmethod(localtime)

    timefunc = localtime

    def __init__(self, absolute=None, period=None):

        # local time tuple

        if absolute is None:

            absolute = self.timefunc()

        self.absolute = absolute

        # optional period in seconds

        self.period = period

    def is_ready(self):

        """return  true if the event is ready to be fired"""

        now = self.timefunc()

        if self.absolute <= now:

            return True

        return False

    def fire(self, server):

        """fire the event

        must be overridden by concrete events

        """

        raise NotImplementedError()

    def update(self):

        """update the absolute date for the event or raise a finished exception

        """

        if self.period is None:

            raise Finished

        self.absolute = localtime(mktime(self.absolute) + self.period)

class QuitEvent(TimeEvent):

    """stop the server"""

    def fire(self, server):

        server.repo.shutdown()

        server.quiting = True

class RepositoryServer(object):

    def __init__(self, config):

        """make the repository available as a PyRO object"""

        self.config = config

        self.repo = Repository(config, TasksManager())

        self.ns = None

        self.quiting = None

        # event queue

        self.events = []

    def add_event(self, event):

        """add an event to the loop"""

        self.info('adding event %s', event)

        self.events.append(event)

    def trigger_events(self):

        """trigger ready events"""

        for event in self.events[:]:

            if event.is_ready():

                self.info('starting event %s', event)

                event.fire(self)

                try:

                    event.update()

                except Finished:

                    self.events.remove(event)

    def run(self, req_timeout=5.0):

        """enter the service loop"""

        # start repository looping tasks

        self.repo.start_looping_tasks()

        while self.quiting is None:

            try:

                self.daemon.handleRequests(req_timeout)

            except select.error:

                continue

            finally:

                self.trigger_events()

    def quit(self):

        """stop the server"""

        self.add_event(QuitEvent())

    def connect(self, host='', port=0):

        """the connect method on the repository only register to pyro if

        necessary

        """

        self.daemon = self.repo.pyro_register(host)

    # server utilitities ######################################################

    def install_sig_handlers(self):

        """install signal handlers"""

        import signal

        self.info('installing signal handlers')

        signal.signal(signal.SIGINT, lambda x, y, s=self: s.quit())

        signal.signal(signal.SIGTERM, lambda x, y, s=self: s.quit())

    # these are overridden by set_log_methods below

    # only defining here to prevent pylint from complaining

    @classmethod

    def info(cls, msg, *a, **kw):

        pass

from logging import getLogger

from cubicweb import set_log_methods

LOGGER = getLogger('cubicweb.reposerver')

set_log_methods(RepositoryServer, LOGGER)