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# Copyright (C) 2013 Aleksey Lim
#
# 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, see <http://www.gnu.org/licenses/>.
import os
import sys
import json
import struct
import logging
from sugar_network.toolkit import coroutine, exception
_logger = logging.getLogger('gbus')
_dbus_thread = None
_dbus_loop = None
def call(op, *args, **kwargs):
result = coroutine.ThreadResult()
class _Exception(tuple):
pass
def do_call():
try:
op(result, *args, **kwargs)
except Exception:
result.set(_Exception(sys.exc_info()))
_logger.trace('Call %s(%r, %r)', op, args, kwargs)
_call(do_call)
value = result.get()
if type(value) is _Exception:
etype, error, traceback = value
raise etype, error, traceback
return value
def pipe(op, *args, **kwargs):
fd_r, fd_w = os.pipe()
def feedback(event=None):
if event is None:
os.close(fd_w)
return
event = json.dumps(event)
os.write(fd_w, struct.pack('i', len(event)))
os.write(fd_w, event)
def do_call():
try:
op(feedback, *args, **kwargs)
except Exception:
exception('Failed to call %r(%r, %r)', op, args, kwargs)
os.close(fd_w)
_logger.trace('Pipe %s(%r, %r)', op, args, kwargs)
try:
_call(do_call)
while True:
coroutine.select([fd_r], [], [])
length = os.read(fd_r, struct.calcsize('i'))
if not length:
break
length = struct.unpack('i', length)[0]
yield json.loads(os.read(fd_r, length))
finally:
os.close(fd_r)
def join():
global _dbus_thread
if _dbus_thread is None:
return
import gobject
gobject.idle_add(_dbus_loop.quit)
_dbus_thread.join()
_dbus_thread = None
def _call(op):
import threading
import gobject
from dbus.mainloop import glib
global _dbus_loop
global _dbus_thread
if _dbus_thread is None:
gobject.threads_init()
glib.threads_init()
glib.DBusGMainLoop(set_as_default=True)
_dbus_loop = gobject.MainLoop()
_dbus_thread = threading.Thread(target=_dbus_loop.run)
_dbus_thread.daemon = True
_dbus_thread.start()
gobject.idle_add(op)
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