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from channels.db import database_sync_to_async
from channels.generic.websocket import AsyncJsonWebsocketConsumer
from .models import Message
class LiveMessageConsumer(AsyncJsonWebsocketConsumer):
async def connect(self):
await self.channel_layer.group_add("live_message", self.channel_name)
await self.accept()
await self.send_current_state()
async def disconnect(self, close_code):
await self.channel_layer.group_discard("live_message", self.channel_name)
@database_sync_to_async
def _fetch_state(self):
qs = Message.objects.order_by("-created")
return {
"count": qs.count(),
"messages": list(qs.values("id", "title", "message")),
}
@database_sync_to_async
def _create_message(self, title, text):
Message.objects.create(title=title, message=text)
@database_sync_to_async
def _delete_message(self, msg_id):
Message.objects.filter(id=msg_id).delete()
async def receive_json(self, content):
action = content.get("action", "create")
if action == "create":
title = content.get("title", "")
text = content.get("message", "")
await self._create_message(title=title, text=text)
elif action == "delete":
msg_id = content.get("id")
await self._delete_message(msg_id)
# After any action, rebroadcast current state
await self.send_current_state()
async def send_current_state(self):
state = await self._fetch_state()
await self.channel_layer.group_send(
"live_message", {"type": "broadcast_message", **state}
)
async def broadcast_message(self, event):
await self.send_json(
{
"count": event["count"],
"messages": event["messages"],
}
)
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