c3lf-system-3/core/notify_sessions/consumers.py

import logging
from json.decoder import JSONDecodeError
from json import loads as json_loads
from json import dumps as json_dumps

from channels.generic.websocket import AsyncWebsocketConsumer


class NotifyConsumer(AsyncWebsocketConsumer):

    def __init__(self, *args, **kwargs):
        super().__init__(args, kwargs)
        self.log = logging.getLogger("server.log")
        self.room_group_name = "general"

    async def connect(self):
        # Join room group
        await self.channel_layer.group_add(self.room_group_name, self.channel_name)
        self.log.info(f"Added {self.channel_name} channel to {self.room_group_name} group")
        await self.accept()

    async def disconnect(self, close_code):
        # Leave room group
        await self.channel_layer.group_discard(self.room_group_name, self.channel_name)

    # Receive message from WebSocket
    async def receive(self, text_data=None, bytes_data=None):
        self.log.info(f"Received message: {text_data}")
        try:
            text_data_json = json_loads(text_data)
            message = text_data_json["message"]

            # Send message to room group
            await self.channel_layer.group_send(
                self.room_group_name,
                {"type": "generic.event", "message": message, "name": "send_message_to_frontend", "event_id": 1}
            )
        except JSONDecodeError as e:
            await self.send(text_data=json_dumps({"message": "error", "error": "malformed json"}))
            self.log.error(e)
        except KeyError as e:
            await self.send(text_data=json_dumps({"message": "error", "error": f"missing key: {str(e)}"}))
            self.log.error(e)
        except Exception as e:
            await self.send(text_data=json_dumps({"message": "error", "error": "unknown error"}))
            self.log.error(e)
            raise e

    # Receive message from room group
    async def generic_event(self, event):
        self.log.info(f"Received event: {event}")
        message = event["message"]
        name = event["name"]
        event_id = event["event_id"]

        # Send message to WebSocket
        await self.send(text_data=json_dumps({"message": message, "name": name, "event_id": event_id}))