server/server.py
author sylvain.thenault@logilab.fr
Thu, 02 Apr 2009 17:12:25 +0200
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"""Pyro RQL server
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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import os
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import sys
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import select
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import warnings
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from time import localtime, mktime
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from cubicweb.cwconfig import CubicWebConfiguration
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from cubicweb.server.repository import Repository
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class Finished(Exception):
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    """raise to remove an event from the event loop"""
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class TimeEvent:
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    """base event"""
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    # timefunc = staticmethod(localtime)
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    timefunc = localtime
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    def __init__(self, absolute=None, period=None):
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        # local time tuple
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        if absolute is None:
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            absolute = self.timefunc()
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        self.absolute = absolute
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        # optional period in seconds
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        self.period = period
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    def is_ready(self):
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        """return  true if the event is ready to be fired"""
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        now = self.timefunc()
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        if self.absolute < now:
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            return True
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        return False
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    def fire(self, server):
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        """fire the event
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        must be overridden by concrete events
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        """
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        raise NotImplementedError()
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    def update(self):
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        """update the absolute date for the event or raise a finished exception
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        """
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        if self.period is None:
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            raise Finished
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        self.absolute = localtime(mktime(self.absolute) + self.period)
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class QuitEvent(TimeEvent):
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    """stop the server"""
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    def fire(self, server):
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        server.repo.shutdown()
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        server.quiting = True
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class RepositoryServer(object):
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    def __init__(self, config, debug=False):
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        """make the repository available as a PyRO object"""
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        self.config = config
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        self.repo = Repository(config, debug=debug)
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        self.ns = None
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        self.quiting = None
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        # event queue
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        self.events = []
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        # start repository looping tasks
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    def add_event(self, event):
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        """add an event to the loop"""
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        self.info('adding event %s', event)
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        self.events.append(event)
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    def trigger_events(self):
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        """trigger ready events"""
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        for event in self.events[:]:
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            if event.is_ready():
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                self.info('starting event %s', event)
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                event.fire(self)
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                try:
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                    event.update()
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                except Finished:
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                    self.events.remove(event)
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    def run(self, req_timeout=5.0):
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        """enter the service loop"""
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        while self.quiting is None:
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            try:
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                self.daemon.handleRequests(req_timeout)
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            except select.error:
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                continue
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            self.trigger_events()
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    def quit(self):
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        """stop the server"""
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        self.add_event(QuitEvent())
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    def connect(self, host='', port=0):
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        """the connect method on the repository only register to pyro if
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        necessary
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        """
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        self.daemon = self.repo.pyro_register(host)
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    # server utilitities ######################################################
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    def install_sig_handlers(self):
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        """install signal handlers"""
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        import signal
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        self.info('installing signal handlers')
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        signal.signal(signal.SIGINT, lambda x, y, s=self: s.quit())
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        signal.signal(signal.SIGTERM, lambda x, y, s=self: s.quit())
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    def daemonize(self, pid_file=None):
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        """daemonize the process"""
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        # fork so the parent can exist
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        if (os.fork()):
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            return -1
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        # deconnect from tty and create a new session
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        os.setsid()
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        # fork again so the parent, (the session group leader), can exit.
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        # as a non-session group leader, we can never regain a controlling
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        # terminal.
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        if (os.fork()):
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            return -1
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        # move to the root to avoit mount pb
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        os.chdir('/')
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        # set paranoid umask
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        os.umask(077)
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        if pid_file is not None:
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            # write pid in a file
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            f = open(pid_file, 'w')
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            f.write(str(os.getpid()))
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            f.close()
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        # filter warnings
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        warnings.filterwarnings('ignore')
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        # close standard descriptors
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        sys.stdin.close()
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        sys.stdout.close()
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        sys.stderr.close()
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from logging import getLogger
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from cubicweb import set_log_methods
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LOGGER = getLogger('cubicweb.reposerver')
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set_log_methods(CubicWebConfiguration, LOGGER)