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# -*- coding: utf-8 -*-
# signaler_qt.py
# Copyright (C) 2013, 2014 LEAP
#
# 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/>.
"""
Signaling server.
Receives signals from the signaling client and emit Qt signals for the GUI.
"""
import os
import threading
import time
from PySide import QtCore
import zmq
try:
from zmq.auth.thread import ThreadAuthenticator
except ImportError:
pass
from leap.bitmask.backend.api import SIGNALS
from leap.bitmask.backend.utils import get_frontend_certificates
from leap.bitmask.config import flags
from leap.bitmask.logs.utils import get_logger
logger = get_logger()
class SignalerQt(QtCore.QObject):
"""
Signaling server.
Receives signals from the signaling client and emit Qt signals for the GUI.
"""
if flags.ZMQ_HAS_CURVE:
PORT = "5667"
BIND_ADDR = "tcp://127.0.0.1:%s" % PORT
else:
SOCKET_FILE = "/tmp/bitmask.socket.1"
BIND_ADDR = "ipc://%s" % SOCKET_FILE
def __init__(self):
QtCore.QObject.__init__(self)
# Note: we use a plain thread instead of a QThread since works better.
# The signaler was not responding on OSX if the worker loop was run in
# a QThread.
# Possibly, ZMQ was not getting cycles to do work because Qt not
# receiving focus or something.
self._worker_thread = threading.Thread(target=self._run)
self._do_work = threading.Event()
def start(self):
"""
Start the worker thread for the signaler server.
"""
self._do_work.set()
self._worker_thread.start()
def _run(self):
"""
Start a loop to process the ZMQ requests from the signaler client.
"""
logger.debug("Running SignalerQt loop")
context = zmq.Context()
socket = context.socket(zmq.REP)
if flags.ZMQ_HAS_CURVE:
# Start an authenticator for this context.
auth = ThreadAuthenticator(context)
auth.start()
auth.allow('127.0.0.1')
# Tell authenticator to use the certificate in a directory
auth.configure_curve(domain='*', location=zmq.auth.CURVE_ALLOW_ANY)
public, secret = get_frontend_certificates()
socket.curve_publickey = public
socket.curve_secretkey = secret
socket.curve_server = True # must come before bind
socket.bind(self.BIND_ADDR)
if not flags.ZMQ_HAS_CURVE:
os.chmod(self.SOCKET_FILE, 0600)
while self._do_work.is_set():
# Wait for next request from client
try:
request = socket.recv(zmq.NOBLOCK)
# logger.debug("Received request: '{0}'".format(request))
socket.send("OK")
self._process_request(request)
except zmq.ZMQError as e:
if e.errno != zmq.EAGAIN:
raise
time.sleep(0.01)
logger.debug("SignalerQt thread stopped.")
def stop(self):
"""
Stop the SignalerQt blocking loop.
"""
self._do_work.clear()
def _process_request(self, request_json):
"""
Process a request and call the according method with the given
parameters.
:param request_json: a json specification of a request.
:type request_json: str
"""
try:
request = zmq.utils.jsonapi.loads(request_json)
signal = request['signal']
data = request['data']
except Exception as e:
msg = "Malformed JSON data in Signaler request '{0}'. Exc: {1!r}"
msg = msg.format(request_json, e)
logger.critical(msg)
raise
if signal not in SIGNALS:
logger.error("Unknown signal received, '{0}'".format(signal))
return
try:
qt_signal = getattr(self, signal)
except Exception:
logger.warning("Signal not implemented, '{0}'".format(signal))
return
# logger.debug("Emitting '{0}'".format(signal))
if data is None:
qt_signal.emit()
else:
qt_signal.emit(data)
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