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WebsocketReceiver.py
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WebsocketReceiver.py
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# -*- coding: utf-8 -*-
#-----------------------------------------------------------------------------
#
# Websocket Alarm Receiver
#
# Copyright (C) 2021 Florian Pose
#
# This file is part of Alarm Display.
#
# Alarm Display 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.
#
# Alarm Display 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
# Alarm Display. If not, see <http://www.gnu.org/licenses/>.
#
#-----------------------------------------------------------------------------
import websocket
import time
import json
import socket
import re
import os
from PyQt5 import QtCore
#-----------------------------------------------------------------------------
def on_message(ws, message):
ws.receiver.logger.info('Websocket received %s.', repr(message))
try:
msg_dict = json.loads(message)
except:
ws.receiver.logger.err('No valid json received.')
return
if 'auth' in msg_dict:
ws.receiver.logger.info('Websocket authentication: %s.',
msg_dict['auth'])
if 'alarm' in msg_dict:
ws.receiver.logger.info('Websocket received alarm.')
ws.receiver.receivedAlarm.emit(msg_dict['alarm'])
if 'status' in msg_dict:
ws.receiver.logger.info('Websocket received status.')
ws.receiver.receivedStatus.emit(msg_dict['status'])
if 'command' in msg_dict:
ws.receiver.logger.info('Websocket received command.')
os.system(msg_dict['command'])
def on_error(ws, error):
ws.receiver.logger.info('Websocket error.')
def on_close(ws):
ws.receiver.logger.info('Websocket closed.')
def on_open(ws):
ws.receiver.logger.info('Websocket connected. Authenticating.')
addresses = []
for address in ws.receiver.status:
addresses.append(address)
msg = {
'host': ws.receiver.user,
'auth_token': ws.receiver.auth_token,
'register_status': addresses,
}
ws.send(json.dumps(msg))
#-----------------------------------------------------------------------------
class WebsocketReceiver(QtCore.QObject):
receivedAlarm = QtCore.pyqtSignal(dict)
receivedStatus = QtCore.pyqtSignal(dict)
finished = QtCore.pyqtSignal()
def __init__(self, config, logger):
super(WebsocketReceiver, self).__init__()
self.logger = logger
self.url = config.get("websocket", "url", fallback = "")
self.user = config.get("websocket", "user",
fallback = socket.gethostname())
self.auth_token = config.get("websocket", "auth_token", fallback = "")
self.status = []
if config.has_section('status'):
addressRe = re.compile('address([0-9]+)')
for key, address in config.items('status'):
ma = addressRe.fullmatch(key)
if not ma or not address:
continue
self.logger.info('Adding status address %s as %s',
key, address)
self.status.append(address)
def receive(self):
if not self.url:
self.finished.emit()
return
self.logger.info('Websocket receiver thread started.')
reconnectTimeout = 30
ws = websocket.WebSocketApp(self.url,
on_open = on_open,
on_message = on_message,
on_error = on_error,
on_close = on_close)
ws.receiver = self
while True:
self.logger.info('Connecting to %s...', self.url)
ws.run_forever()
self.logger.error('Websocket closed. Waiting to reconnect...')
time.sleep(reconnectTimeout)
self.logger.info('Receiver thread finished.')
self.finished.emit()
#-----------------------------------------------------------------------------