forked from openlp/openlp
Fix an issue with versions of websockets > 4.0
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parent
2d009f1884
commit
3e9073275a
@ -28,7 +28,7 @@ import json
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import logging
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import time
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import websockets
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from websockets import serve
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from openlp.core.common.mixins import LogMixin, RegistryProperties
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from openlp.core.common.registry import Registry
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@ -38,31 +38,76 @@ from openlp.core.threading import ThreadWorker, run_thread
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log = logging.getLogger(__name__)
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class WebSocketWorker(ThreadWorker):
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async def handle_websocket(request, path):
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"""
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Handle web socket requests and return the poll information.
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Check ever 0.2 seconds to get the latest position and send if changed.
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Only gets triggered when 1st client attaches
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:param request: request from client
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:param path: determines the endpoints supported
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:return:
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"""
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log.debug('WebSocket handler registered with client')
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previous_poll = None
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previous_main_poll = None
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poller = Registry().get('poller')
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if path == '/state':
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while True:
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current_poll = poller.poll()
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if current_poll != previous_poll:
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await request.send(json.dumps(current_poll).encode())
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previous_poll = current_poll
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await asyncio.sleep(0.2)
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elif path == '/live_changed':
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while True:
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main_poll = poller.main_poll()
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if main_poll != previous_main_poll:
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await request.send(main_poll)
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previous_main_poll = main_poll
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await asyncio.sleep(0.2)
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class WebSocketWorker(ThreadWorker, RegistryProperties, LogMixin):
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"""
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A special Qt thread class to allow the WebSockets server to run at the same time as the UI.
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"""
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def __init__(self, server):
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"""
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Constructor for the thread class.
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:param server: The http server class.
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"""
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self.ws_server = server
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super().__init__()
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def start(self):
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"""
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Run the worker.
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"""
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self.ws_server.start_server()
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address = Settings().value('api/ip address')
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port = Settings().value('api/websocket port')
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# Start the event loop
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event_loop = asyncio.new_event_loop()
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asyncio.set_event_loop(event_loop)
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# Create the websocker server
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loop = 1
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self.server = None
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while not self.server:
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try:
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self.server = serve(handle_websocket, address, port)
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log.debug('WebSocket server started on {addr}:{port}'.format(addr=address, port=port))
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except Exception as e:
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log.exception('Failed to start WebSocket server')
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loop += 1
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time.sleep(0.1)
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if not self.server and loop > 3:
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log.error('Unable to start WebSocket server {addr}:{port}, giving up'.format(addr=address, port=port))
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if self.server:
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# If the websocket server exists, start listening
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event_loop.run_until_complete(self.server)
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event_loop.run_forever()
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self.quit.emit()
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def stop(self):
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"""
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Stop the websocket server
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"""
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self.ws_server.stop_server()
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if hasattr(self.server, 'ws_server'):
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self.server.ws_server.close()
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elif hasattr(self.server, 'server'):
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self.server.server.close()
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class WebSocketServer(RegistryProperties, LogMixin):
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@ -75,79 +120,5 @@ class WebSocketServer(RegistryProperties, LogMixin):
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"""
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super(WebSocketServer, self).__init__()
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if Registry().get_flag('no_web_server'):
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self.settings_section = 'api'
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worker = WebSocketWorker(self)
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worker = WebSocketWorker()
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run_thread(worker, 'websocket_server')
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def start_server(self):
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"""
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Start the correct server and save the handler
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"""
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address = Settings().value(self.settings_section + '/ip address')
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port = Settings().value(self.settings_section + '/websocket port')
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self.start_websocket_instance(address, port)
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# If web socket server start listening
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if hasattr(self, 'ws_server') and self.ws_server:
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event_loop = asyncio.new_event_loop()
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asyncio.set_event_loop(event_loop)
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event_loop.run_until_complete(self.ws_server)
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event_loop.run_forever()
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else:
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log.debug('Failed to start ws server on port {port}'.format(port=port))
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def stop_server(self):
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"""
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Stop the websocket server
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"""
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if hasattr(self.ws_server, 'ws_server'):
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self.ws_server.ws_server.close()
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elif hasattr(self.ws_server, 'server'):
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self.ws_server.server.close()
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def start_websocket_instance(self, address, port):
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"""
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Start the server
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:param address: The server address
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:param port: The run port
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"""
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loop = 1
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while loop < 4:
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try:
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self.ws_server = websockets.serve(self.handle_websocket, address, port)
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log.debug("Web Socket Server started for class {address} {port}".format(address=address, port=port))
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break
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except Exception as e:
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log.exception('Failed to start ws server {why}'.format(why=e))
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loop += 1
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time.sleep(0.1)
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@staticmethod
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async def handle_websocket(request, path):
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"""
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Handle web socket requests and return the poll information.
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Check ever 0.2 seconds to get the latest position and send if changed.
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Only gets triggered when 1st client attaches
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:param request: request from client
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:param path: determines the endpoints supported
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:return:
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"""
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log.debug("web socket handler registered with client")
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previous_poll = None
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previous_main_poll = None
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poller = Registry().get('poller')
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if path == '/state':
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while True:
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current_poll = poller.poll()
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if current_poll != previous_poll:
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await request.send(json.dumps(current_poll).encode())
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previous_poll = current_poll
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await asyncio.sleep(0.2)
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elif path == '/live_changed':
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while True:
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main_poll = poller.main_poll()
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if main_poll != previous_main_poll:
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await request.send(main_poll)
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previous_main_poll = main_poll
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await asyncio.sleep(0.2)
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