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# Copyright (C) 2009, 2010 One Laptop per Child
#
# 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 dbus
import gobject
from jarabe.model import network
from jarabe.model.network import Settings
from jarabe.model.network import OlpcMesh as OlpcMeshSettings
from sugar.util import unique_id
_XS_ANYCAST = '\xc0\x27\xc0\x27\xc0\x00'
class OlpcMeshManager(object):
def __init__(self, mesh_device):
self._bus = dbus.SystemBus()
# counter for how many asynchronous connection additions we are
# waiting for
self._add_connections_pending = 0
self.mesh_device = mesh_device
self.eth_device = self._get_companion_device()
self._connection_queue = []
"""Stack of connections that we'll iterate through until we find one
that works. Each entry in the list specifies the channel and
whether to seek an XS or not."""
# Ensure that all the connections we'll use later are present
for channel in (1, 6, 11):
self._ensure_connection_exists(channel, xs_hosted=True)
self._ensure_connection_exists(channel, xs_hosted=False)
props = dbus.Interface(self.mesh_device, dbus.PROPERTIES_IFACE)
props.Get(network.NM_DEVICE_IFACE, 'State',
reply_handler=self.__get_mesh_state_reply_cb,
error_handler=self.__get_state_error_cb)
props = dbus.Interface(self.eth_device, dbus.PROPERTIES_IFACE)
props.Get(network.NM_DEVICE_IFACE, 'State',
reply_handler=self.__get_eth_state_reply_cb,
error_handler=self.__get_state_error_cb)
self._bus.add_signal_receiver(self.__eth_device_state_changed_cb,
signal_name='StateChanged',
path=self.eth_device.object_path,
dbus_interface=network.NM_DEVICE_IFACE)
self._bus.add_signal_receiver(self.__mshdev_state_changed_cb,
signal_name='StateChanged',
path=self.mesh_device.object_path,
dbus_interface=network.NM_DEVICE_IFACE)
self._idle_source = 0
self._mesh_device_state = network.NM_DEVICE_STATE_UNKNOWN
self._eth_device_state = network.NM_DEVICE_STATE_UNKNOWN
if self._add_connections_pending == 0:
self.ready()
def ready(self):
"""Called when all connections have been added (if they were not
already present), meaning that we can start the automesh functionality.
"""
if self._have_configured_connections():
self._start_automesh_timer()
else:
self._start_automesh()
def _get_companion_device(self):
props = dbus.Interface(self.mesh_device, dbus.PROPERTIES_IFACE)
eth_device_o = props.Get(network.NM_OLPC_MESH_IFACE, 'Companion')
return self._bus.get_object(network.NM_SERVICE, eth_device_o)
def _have_configured_connections(self):
return len(network.get_connections().get_list()) > 0
def _start_automesh_timer(self):
"""Start our timer system which basically looks for 10 seconds of
inactivity on both devices, then starts automesh.
"""
if self._idle_source != 0:
gobject.source_remove(self._idle_source)
self._idle_source = gobject.timeout_add_seconds(10, self._idle_check)
def __get_state_error_cb(self, err):
logging.debug('Error getting the device state: %s', err)
def __get_mesh_state_reply_cb(self, state):
self._mesh_device_state = state
self._maybe_schedule_idle_check()
def __get_eth_state_reply_cb(self, state):
self._eth_device_state = state
self._maybe_schedule_idle_check()
def __eth_device_state_changed_cb(self, new_state, old_state, reason):
"""If a connection is activated on the eth device, stop trying our
automatic connections.
"""
self._eth_device_state = new_state
self._maybe_schedule_idle_check()
if new_state >= network.NM_DEVICE_STATE_PREPARE \
and new_state <= network.NM_DEVICE_STATE_ACTIVATED \
and len(self._connection_queue) > 0:
self._connection_queue = []
def __mshdev_state_changed_cb(self, new_state, old_state, reason):
self._mesh_device_state = new_state
self._maybe_schedule_idle_check()
if new_state == network.NM_DEVICE_STATE_FAILED:
self._try_next_connection_from_queue()
elif new_state == network.NM_DEVICE_STATE_ACTIVATED \
and len(self._connection_queue) > 0:
self._empty_connection_queue()
def _maybe_schedule_idle_check(self):
if self._mesh_device_state == network.NM_DEVICE_STATE_DISCONNECTED \
and self._eth_device_state == network.NM_DEVICE_STATE_DISCONNECTED:
self._start_automesh_timer()
def _idle_check(self):
if self._mesh_device_state == network.NM_DEVICE_STATE_DISCONNECTED \
and self._eth_device_state == network.NM_DEVICE_STATE_DISCONNECTED:
logging.debug('starting automesh due to inactivity')
self._start_automesh()
return False
@staticmethod
def _get_connection_id(channel, xs_hosted):
if xs_hosted:
return '%s%d' % (network.XS_MESH_CONNECTION_ID_PREFIX, channel)
else:
return '%s%d' % (network.MESH_CONNECTION_ID_PREFIX, channel)
def _connection_added(self):
if self._add_connections_pending > 0:
self._add_connections_pending = self._add_connections_pending - 1
if self._add_connections_pending == 0:
self.ready()
def _add_connection_reply_cb(self, connection):
logging.debug("Added connection: %s", connection)
self._connection_added()
def _add_connection_err_cb(self, err):
logging.debug("Error adding mesh connection: %s", err)
self._connection_added()
def _add_connection(self, channel, xs_hosted):
anycast_addr = _XS_ANYCAST if xs_hosted else None
wireless_config = OlpcMeshSettings(channel, anycast_addr)
settings = Settings(wireless_cfg=wireless_config)
if not xs_hosted:
settings.ip4_config = network.IP4Config()
settings.ip4_config.method = 'link-local'
settings.connection.id = self._get_connection_id(channel, xs_hosted)
settings.connection.autoconnect = False
settings.connection.uuid = unique_id()
settings.connection.type = '802-11-olpc-mesh'
network.add_connection(settings,
reply_handler=self._add_connection_reply_cb,
error_handler=self._add_connection_err_cb)
def _find_connection(self, channel, xs_hosted):
connection_id = self._get_connection_id(channel, xs_hosted)
return network.find_connection_by_id(connection_id)
def _ensure_connection_exists(self, channel, xs_hosted):
if not self._find_connection(channel, xs_hosted):
self._add_connection(channel, xs_hosted)
def _activate_connection(self, channel, xs_hosted):
connection = self._find_connection(channel, xs_hosted)
if connection:
connection.activate(self.mesh_device.object_path)
else:
logging.warning("Could not find mesh connection")
def _try_next_connection_from_queue(self):
if len(self._connection_queue) == 0:
return
channel, xs_hosted = self._connection_queue.pop()
self._activate_connection(channel, xs_hosted)
def _empty_connection_queue(self):
self._connection_queue = []
def user_activate_channel(self, channel):
"""Activate a mesh connection on a user-specified channel.
Looks for XS first, then resorts to simple mesh."""
self._empty_connection_queue()
self._connection_queue.append((channel, False))
self._connection_queue.append((channel, True))
self._try_next_connection_from_queue()
def _start_automesh(self):
"""Start meshing automatically, intended when there are no better
networks to connect to. First looks for XS on all channels, then falls
back to simple mesh on channel 1."""
self._empty_connection_queue()
self._connection_queue.append((1, False))
self._connection_queue.append((11, True))
self._connection_queue.append((6, True))
self._connection_queue.append((1, True))
self._try_next_connection_from_queue()
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