NDOJ/chat_box/consumers.py

import json
from channels.generic.websocket import AsyncWebsocketConsumer
from .models import Message
from django.urls import reverse
from django.http import HttpResponse, HttpResponseRedirect
from django.core import serializers

from judge.models.profile import Profile


class ChatConsumer(AsyncWebsocketConsumer):
    async def connect(self):
        self.room_name = 'room'
        self.room_group_name = 'chat_%s' % self.room_name

        # Join room group
        await self.channel_layer.group_add(
            self.room_group_name,
            self.channel_name,
        )

        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):
        text_data_json = json.loads(text_data)
        message = text_data_json['message']
        
        message_saved = save_data_and_return(message)
        message['time'] = message_saved[0]['fields']['time']
        message['id'] = message_saved[0]['pk']

        # Send message to room group
        await self.channel_layer.group_send(
            self.room_group_name,
            {
                'type': 'chat_message',
                'message': message,
            },
        )

    # Receive message from room group
    async def chat_message(self, event):
        message = event['message']
        # Send message to WebSocket
        await self.send(text_data=json.dumps({
            'message': message,
        }))


# return time
def save_data_and_return(message):
    new_message = Message(body=message['body'],
                          author=Profile.objects
                                        .get(pk=message['author_id']),
                          )
    new_message.save()
    json_data = serializers.serialize("json", 
                                        Message.objects
                                               .filter(pk=new_message.id)
                                      )
    return json.loads(json_data)