First play with websockets

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

draw/consumers.py

@@ -0,0 +1,45 @@
+import json
+
+from asgiref.sync import sync_to_async
+from channels.generic.websocket import AsyncJsonWebsocketConsumer
+
+from participation.models import Tournament
+
+
+class DrawConsumer(AsyncJsonWebsocketConsumer):
+    async def connect(self):
+        tournament_id = self.scope['url_route']['kwargs']['tournament_id']
+        self.tournament = await sync_to_async(Tournament.objects.get)(pk=tournament_id)
+
+        user = self.scope['user']
+        reg = user.registration
+        if reg.is_volunteer and not reg.is_admin and self.tournament not in reg.interesting_tournaments \
+            or not reg.is_volunteer and reg.team.participation.tournament != self.tournament:
+            # This user may not have access to the drawing session
+            await self.close()
+            return
+
+        await self.accept()
+        await self.channel_layer.group_add(f"tournament-{self.tournament.id}", self.channel_name)
+
+    async def disconnect(self, close_code):
+        await self.channel_layer.group_discard(f"tournament-{self.tournament.id}", self.channel_name)
+
+    async def receive_json(self, content, **kwargs):
+        message = content["message"]
+
+        print(self.scope)
+
+        # TODO: Implement drawing system, instead of making a simple chatbot
+        await self.channel_layer.group_send(
+            f"tournament-{self.tournament.id}",
+            {
+                "type": "draw.message",
+                "username": self.scope["user"].username,
+                "message": message,
+            }
+        )
+
+    async def draw_message(self, event):
+        print(event)
+        await self.send_json({"message": event['message']})