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# -*- mode:python; tab-width:4; indent-tabs-mode:nil; -*-
# sharedslides.py
#
# Class that performs all work relating to the sharing of slide decks and ink.
# Kris Plunkett <kp86@cs.washington.edu>
#
# 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 2 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 logging
import sys
import os
import time
import random
import gobject
import telepathy
import telepathy.client
import dbus
from dbus.service import method, signal
from dbus.gobject_service import ExportedGObject
from sugar.presence import presenceservice
from sugar import network
from sugar.presence.tubeconn import TubeConnection
SERVICE = "edu.washington.cs.ClassroomPresenterXO"
IFACE = SERVICE
PATH = "/edu/washington/cs/ClassroomPresenterXO"
# Define a simple HTTP server for sharing data.
class ReadHTTPRequestHandler(network.ChunkedGlibHTTPRequestHandler):
def translate_path(self, path):
return self.server._filepath
class ReadHTTPServer(network.GlibTCPServer):
def __init__(self, server_address, filepath):
self._filepath = filepath
network.GlibTCPServer.__init__(self, server_address, ReadHTTPRequestHandler)
class SharedSlides(gobject.GObject):
""" Handles all sharing of slides and ink """
__gsignals__ = {
'deck-download-complete' : (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, ()),
}
def __init__(self, init, cpxo_path, shared_activity, read_file_cb):
gobject.GObject.__init__(self)
self.__is_initiating = init
self.__cpxo_path = cpxo_path
self.__shared_activity = shared_activity
self.read_file_cb = read_file_cb
self.__logger = logging.getLogger('SharedSlides')
self.__tubes_chan = self.__shared_activity.telepathy_tubes_chan
self.__iface = self.__tubes_chan[telepathy.CHANNEL_TYPE_TUBES]
if (self.__is_initiating):
self.__logger.debug('Hello from SharedSlides (sharer).')
self.__have_deck = True
self.share_deck()
else:
# find a stream tube to download the slide deck from
self.__logger.debug('Hello from SharedSlides (joiner).')
self.__iface.connect_to_signal('NewTube', self.new_tube_cb)
self.__have_deck = False
self.get_stream_tube()
def get_stream_tube(self):
""" Attempts to download the slide deck from an available stream tube """
self.__iface.ListTubes(
reply_handler=self.list_tubes_reply_cb,
error_handler=self.list_tubes_error_cb)
def handle_download_fail(self):
""" If an attempt to download the deck fails, this method takes care of it """
self.__logger.error('Download failed! Sleeping five seconds and trying again.')
time.sleep(5)
self.get_stream_tube()
def list_tubes_reply_cb(self, tubes):
for tube_info in tubes:
self.new_tube_cb(*tube_info)
def list_tubes_error_cb(self, e):
self.__logger.error('ListTubes() failed: %s', e)
self.handle_download_fail
def new_tube_cb(self, id, initiator, type, service, params, state):
self.__logger.debug('New tube: ID=%d initiator=%d type=%d service=%s params=%r state=%d',
id, initiator, type, service, params, state)
if (not self.__have_deck and
type == telepathy.TUBE_TYPE_STREAM and
service == SERVICE and
state == telepathy.TUBE_STATE_LOCAL_PENDING):
addr = self.__iface.AcceptStreamTube(id,
telepathy.SOCKET_ADDRESS_TYPE_IPV4,
telepathy.SOCKET_ACCESS_CONTROL_LOCALHOST, 0,
utf8_strings=True)
self.__logger.debug("Got a stream tube!")
# sanity checks
assert isinstance(addr, dbus.Struct)
assert len(addr) == 2
assert isinstance(addr[0], str)
assert isinstance(addr[1], (int, long))
assert addr[1] > 0 and addr[1] < 65536
ip_addr = addr[0]
port = int(addr[1])
self.__logger.debug("The stream tube is good!")
self.download_file(ip_addr, port, id)
def download_file(self, ip_addr, port, tube_id):
""" Performs the actual download of the slide deck """
self.__logger.debug("Downloading from ip %s and port %d.", ip_addr, port)
getter = network.GlibURLDownloader("http://%s:%d/document" % (ip_addr, port))
getter.connect("finished", self.download_result_cb, tube_id)
getter.connect("progress", self.download_progress_cb, tube_id)
getter.connect("error", self.download_error_cb, tube_id)
self.__logger.debug("Starting download to %s...", self.__cpxo_path)
getter.start(self.__cpxo_path)
def download_result_cb(self, getter, tempfile, suggested_name, tube_id):
""" Called when the file download was successful """
self.__logger.debug("Got file %s (%s) from tube %u",
tempfile, suggested_name, tube_id)
self.emit('deck-download-complete')
self.read_file_cb(self.__cpxo_path)
def download_progress_cb(self, getter, bytes_downloaded, tube_id):
tmp = True
#self.__logger.debug("Bytes downloaded from tube %u: %u", tube_id, bytes_downloaded)
def download_error_cb(self, getter, err, tube_id):
self.__logger.error('Download failed on tube %u: %s', tube_id, err)
self.handle_download_fail()
def share_deck(self):
""" As the instructor XO, or as a student that has completed the deck download
share the deck with others in the activity """
# get a somewhat random port number
self.__port = random.randint(1024, 65535)
self.__ip_addr = "127.0.0.1"
self._fileserver = ReadHTTPServer(("", self.__port), self.__cpxo_path)
self.__logger.debug('Started an HTTP server on port %d', self.__port)
self.__iface.OfferStreamTube(SERVICE, {},
telepathy.SOCKET_ADDRESS_TYPE_IPV4,
(self.__ip_addr, dbus.UInt16(self.__port)),
telepathy.SOCKET_ACCESS_CONTROL_LOCALHOST, 0)
self.__logger.debug('Made a stream tube.')
gobject.type_register(SharedSlides)
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