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# coding: UTF8
# Copyright 2009 Thomas Jourdan
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import hashlib
import base64
from dbus.service import method, signal
from dbus.gobject_service import ExportedGObject
import ka_debug
SERVICE = 'net.sourceforge.kandid'
IFACE = SERVICE
PATH = '/net/sourceforge/kandid/minimal'
SEND_POPULATION = 'P'
SEND_PROTOZOON = 'I'
class KandidTube(ExportedGObject):
"""The bit that talks over the tubes"""
def __init__(self, controller, tube, is_initiator, get_buddy):
super(KandidTube, self).__init__(tube, PATH)
self._controller = controller
self._tube = tube
self._is_initiator = is_initiator
self._get_buddy = get_buddy # Converts handle to Buddy object
self._entered = False # Have we set up the tube?
self._tube.watch_participants(self.on_participant_change)
def on_participant_change(self, added, removed):
if added:
ka_debug.info('Tube: Added participants: %r' % added)
if removed:
ka_debug.info('Tube: Removed participants: %r' % removed)
for handle, bus_name in added:
buddy = self._get_buddy(handle)
if buddy is not None:
ka_debug.info('Tube: Handle %u (Buddy [%s]) was added' % \
(handle, buddy.props.nick))
for handle in removed:
buddy = self._get_buddy(handle)
if buddy is not None:
ka_debug.info('Buddy [%s] was removed' % buddy.props.nick)
if not self._entered:
if self._is_initiator:
ka_debug.info("I'm initiating the tube, will watch for hellos.")
self.add_hello_handler()
self.add_publish_handler()
else:
ka_debug.info('Hello, everyone! What did I miss?')
self.Hello()
self.add_publish_handler()
self._entered = True
def add_hello_handler(self):
ka_debug.info('I am initiating. Adding hello handler.')
self._tube.add_signal_receiver(self.on_hello, 'Hello',
IFACE, path=PATH, sender_keyword='sender')
def add_publish_handler(self):
ka_debug.info('I am entered. Adding input handler.')
self._tube.add_signal_receiver(self.on_publish_protozoon, 'PublishProtozoon',
IFACE, path=PATH, sender_keyword='sender')
@signal(dbus_interface=IFACE, signature='')
def Hello(self):
"""Say Hello to whoever else is in the tube."""
ka_debug.info('I said Hello.')
def on_hello(self, sender=None):
"""Somebody helloed me. Send them my population."""
if sender == self._tube.get_unique_name():
# sender is my bus name, so ignore my own signal
return
ka_debug.info('on_hello: Newcomer [%s] has joined. World them.' % sender)
self.send_population(self._controller.serialize_model(), sender)
def publish_protozoon(self, code_element):
ka_debug.info('publish_protozoon: %s %s' % (type(code_element), code_element))
code_element_base64 = base64.b64encode(code_element)
code_md5 = hashlib.md5(code_element).hexdigest()
ka_debug.info('publish_protozoon: Sent %u bytes, type: [%s] md5: [%s]' % \
(len(code_element), SEND_PROTOZOON, code_md5))
self.PublishProtozoon(SEND_PROTOZOON, code_element_base64, code_md5)
@signal(dbus_interface=IFACE, signature='sss')
def PublishProtozoon(self, code_type, code_element, code_md5):
"""Send protozoon."""
ka_debug.info('PublishProtozoon: I published %u bytes, type: [%s] md5: [%s]' \
% (len(code_element), code_type, code_md5))
def on_publish_protozoon(self, code_type, code_element, code_md5, sender=None):
"""Somebody published. Process received parameters."""
if sender == self._tube.get_unique_name():
# sender is my bus name, so ignore my own signal
return
ka_debug.info('on_publish: I got %u bytes, type: [%s] md5: [%s]' \
% (len(code_element), code_type, code_md5))
dec = base64.b64decode(code_element)
self._controller.on_received(code_type, dec, code_md5)
def send_population(self, code_element, sender=None):
code_element_base64 = base64.b64encode(code_element)
code_md5 = hashlib.md5(code_element).hexdigest()
ka_debug.info('send_population: Sent %u bytes, type: [%s] md5: [%s]' % \
(len(code_element), SEND_POPULATION, code_md5))
self._tube.get_object(sender, PATH).SendPopulation(SEND_POPULATION,
code_element_base64,
code_md5)
#@signal(dbus_interface=IFACE, signature='sss')
@method(dbus_interface=IFACE, in_signature='sss', out_signature='')
def SendPopulation(self, code_type, code_element, code_md5):
"""Send to all participants."""
ka_debug.info('SendPopulation: Sent %u bytes, type: [%s] md5: [%s]' \
% (len(code_element), code_type, code_md5))
dec = base64.b64decode(code_element)
self._controller.on_received(code_type, dec, code_md5)
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