tasks.py 文件源码

def notify_users_when_wanted( event = None ):
    """ notifies users if *event* matches a filter of a user and the
    user wants to be notified for the matching filter """
    from grical.events.models import Event, Filter
    if isinstance(event, Event):
        pass
    elif isinstance(event, int) or isinstance(event, long):
        event = Event.objects.get(pk = event)
    else:
        event = Event.objects.get(pk = int(event))
    # TODO: the next code iterate throw all users but this is not workable
    # for a big number of users: implement a special data structure which
    # saves filters and can look up fast filters matching an event
    # TODO: show a diff of the changes
    users = User.objects.all()
    for user in users:
        user_filters = Filter.objects.filter( user = user ).filter(
                email = True)
        for fil in user_filters:
            if not fil.matches_event( event ):
                continue
            context = {
                'username': user.username,
                'event': event,
                'filter': fil,
                'site_name': Site.objects.get_current().name,
                'site_domain': Site.objects.get_current().domain, }
            # TODO: create the subject from a text template
            subject = _(u'filter match: ') + event.title
            # TODO: use a preferred language setting for users to send
            # emails to them in this language
            message = render_to_string( 'mail/event_notice.txt', context )
            from_email = settings.DEFAULT_FROM_EMAIL
            if subject and message and from_email and user.email:
                try:
                    if ( not settings.DEBUG ) or user.username in \
                            settings.USERNAMES_TO_MAIL_WHEN_DEBUGGING:
                        send_mail( subject, message, from_email,
                            [user.email,], fail_silently = False )
                except (BadHeaderError, SMTPConnectError), err:
                    logger.error(u'SMTP error while trying to send '
                            'notificationsemail - %s'%err)
                except:
                    logger.error(u'Unexpected error while trying to send '
                            'notifications - %s'%traceback.format_exc())
            else:
                # FIXME: do something meaningfull, e.g. error log
                pass