240 lines
8.7 KiB
Python
240 lines
8.7 KiB
Python
import asyncio
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from asyncio.futures import Future
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from asyncio.tasks import Task, shield
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import multiprocessing
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import queue
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from typing import List
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import websockets
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import json
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from os import _exit
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from helpers.logging_manager import LoggingManager
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from websockets.server import Serve
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class WebsocketServer:
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threads = Future
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baps_clients = set()
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channel_to_q: List[multiprocessing.Queue]
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webstudio_to_q: List[multiprocessing.Queue]
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server_name: str
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logger: LoggingManager
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to_webstudio: Task
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from_webstudio: Task
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websocket_server: Serve
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def __init__(self, in_q, out_q, state):
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self.channel_to_q = in_q
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self.webstudio_to_q = out_q
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self.logger = LoggingManager("Websockets")
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self.server_name = state.state["server_name"]
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self.websocket_server = websockets.serve(
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self.websocket_handler, state.state["host"], state.state["ws_port"]
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)
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asyncio.get_event_loop().run_until_complete(self.websocket_server)
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try:
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asyncio.get_event_loop().run_forever()
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except Exception:
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# Sever died somehow, just quit out.
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self.quit()
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def quit(self):
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del self.websocket_server
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del self.logger
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_exit(0)
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def __del__(self):
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print("Deleting websocket server")
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self.quit()
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async def websocket_handler(self, websocket, path):
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self.baps_clients.add(websocket)
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await websocket.send(
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json.dumps({"message": "Hello", "serverName": self.server_name})
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)
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self.logger.log.info("New Client: {}".format(websocket))
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for channel in self.channel_to_q:
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channel.put("WEBSOCKET:STATUS")
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async def handle_from_webstudio():
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try:
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async for message in websocket:
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data = json.loads(message)
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if "channel" not in data:
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# Didn't specify a channel, send to all.
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for channel in range(len(self.channel_to_q)):
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sendCommand(channel, data)
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else:
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channel = int(data["channel"])
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sendCommand(channel, data)
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async def send(conn, message):
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conn.send(message)
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await asyncio.wait(
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[send(conn, message) for conn in self.baps_clients]
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)
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except websockets.exceptions.ConnectionClosedError as e:
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self.logger.log.error(
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"Client Disconncted {}, {}".format(websocket, e))
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except Exception as e:
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self.logger.log.exception(
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"Exception handling messages from Websocket.\n{}".format(e)
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)
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finally:
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self.logger.log.info("Removing client: {}".format(websocket))
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self.baps_clients.remove(websocket)
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def sendCommand(channel, data):
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if channel not in range(len(self.channel_to_q)):
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self.logger.log.exception(
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"Received channel number larger than server supported channels."
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)
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return
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if "command" in data.keys():
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command = data["command"]
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# Handle the general case
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# Message format:
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# SOURCE:COMMAND:EXTRADATA
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message = "WEBSOCKET:" + command
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# If we just want PLAY, PAUSE etc, we're all done.
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# Else, let's pipe in some extra info.
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extra = ""
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try:
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if command == "SEEK":
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extra += str(data["time"])
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elif command == "LOAD":
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extra += str(data["weight"])
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elif command == "AUTOADVANCE":
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extra += str(data["enabled"])
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elif command == "PLAYONLOAD":
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extra += str(data["enabled"])
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elif command == "REPEAT":
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extra += str(data["mode"]).lower()
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elif command == "ADD":
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extra += json.dumps(data["newItem"])
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elif command == "REMOVE":
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extra += str(data["weight"])
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elif command == "GET_PLAN":
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extra += str(data["timeslotId"])
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# SPECIAL CASE ALERT! We need to talk to two channels here.
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elif command == "MOVE":
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# TODO Should we trust the client with the item info?
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# Tell the old channel to remove "weight"
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extra += str(data["weight"])
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# Now modify the item with the weight in the new channel
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new_channel = int(data["new_channel"])
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item = data["item"]
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item["weight"] = int(data["new_weight"])
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# Now send the special case.
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self.channel_to_q[new_channel].put(
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"ADD:" + json.dumps(item))
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except ValueError as e:
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self.logger.log.exception(
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"Error decoding extra data {} for command {} ".format(
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e, command
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)
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)
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pass
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# Stick the message together and send!
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if extra != "":
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message += ":" + extra
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try:
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self.channel_to_q[channel].put(message)
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except Exception as e:
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self.logger.log.exception(
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"Failed to send message {} to channel {}: {}".format(
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message, channel, e
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)
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)
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else:
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self.logger.log.error(
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"Command missing from message. Data: {}".format(data)
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)
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async def handle_to_webstudio():
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while True:
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for channel in range(len(self.webstudio_to_q)):
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try:
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message = self.webstudio_to_q[channel].get_nowait()
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source = message.split(":")[0]
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# TODO ENUM
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if source not in ["WEBSOCKET", "ALL"]:
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print(
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"ERROR: Message received from invalid source to websocket_handler. Ignored.",
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source,
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message,
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)
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continue
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command = message.split(":")[1]
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# print("Websocket Out:", command)
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if command == "STATUS":
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try:
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message = message.split("OKAY:")[1]
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message = json.loads(message)
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except Exception:
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continue # TODO more logging
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elif command == "POS":
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try:
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message = message.split(":", 2)[2]
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except Exception:
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continue
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elif command == "QUIT":
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self.quit()
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else:
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continue
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data = json.dumps(
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{"command": command, "data": message, "channel": channel}
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)
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await asyncio.wait(
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[conn.send(data) for conn in self.baps_clients]
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)
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except queue.Empty:
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continue
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except ValueError:
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# Typically a "Set of coroutines/Futures is empty." when sending to a dead client.
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continue
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except Exception as e:
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self.logger.log.exception(
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"Exception trying to send to websocket:", e
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)
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await asyncio.sleep(0.02)
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self.from_webstudio = asyncio.create_task(handle_from_webstudio())
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self.to_webstudio = asyncio.create_task(handle_to_webstudio())
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try:
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self.threads = await shield(
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asyncio.gather(self.from_webstudio, self.to_webstudio)
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)
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finally:
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self.from_webstudio.cancel()
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self.to_webstudio.cancel()
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if __name__ == "__main__":
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print("Don't do this")
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