Implement basic channels feature for testing

recircle/instance/models.py

@@ -7,6 +7,9 @@ from image.models import Disk
 from interface_openstack.implementation.vm.instance import (
     OSVirtualMachineManager
 )
+from channels.layers import get_channel_layer
+from asgiref.sync import async_to_sync
+
 import logging
 
 logger = logging.getLogger(__name__)
@@ -251,8 +254,11 @@ class Instance(BaseMachineDescriptor):
 
     def update_status(self):
         remote = self.get_remote_instance()
-        self.status = remote.status
-        self.save()
+        if self.status is not remote.status:
+            self.status = remote.status
+            channels = get_channel_layer()
+            async_to_sync(channels.group_send)(str(self.id), {"type": "status.status_changed"})
+            self.save()
 
     @classmethod
     def generate_password(self):

status/consumers.py

 # import json
-# from asgiref.sync import async_to_sync
+from asgiref.sync import async_to_sync
 from channels.generic.websocket import WebsocketConsumer
+from recircle.instance.models import Instance
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 class StatusConsumer(WebsocketConsumer):
     def connect(self):
-        pass
+        instances = Instance.objects.all()
+        for inst in instances:
+            async_to_sync(self.channel_layer.group_add)(
+                str(inst.id),
+                self.channel_name
+            )
 
     def disconnect(self):
-        pass
+        instances = Instance.objects.all()
+        for inst in instances:
+            async_to_sync(self.channel_layer.group_discard)(
+                str(inst.id),
+                self.channel_name
+            )
 
     def receive(self, text_message):
         pass
+
+    def status_changed(self, event):
+        logger.info("Event received")
+        self.send(text_data=event["status"])