root: add Channels Message Storage and consumer

passbook/root/messages/storage.py

@@ -0,0 +1,34 @@
+"""Channels Messages storage"""
+from asgiref.sync import async_to_sync
+from channels.layers import get_channel_layer
+from django.contrib.messages.storage.base import BaseStorage, Message
+from django.core.cache import cache
+from django.http.request import HttpRequest
+
+
+class ChannelsStorage(BaseStorage):
+    """Send contrib.messages over websocket"""
+
+    def __init__(self, request: HttpRequest) -> None:
+        # pyright: reportGeneralTypeIssues=false
+        super().__init__(request)
+        self.channel = get_channel_layer()
+
+    def _store(self, messages: list[Message], response, *args, **kwargs):
+        prefix = f"user_{self.request.user.pk}_"
+        keys = cache.keys(f"{prefix}*")
+        for key in keys:
+            uid = key.replace(prefix, "")
+            for message in messages:
+                async_to_sync(self.channel.send)(
+                    uid,
+                    {
+                        "type": "event.update",
+                        "levelTag": message.level_tag,
+                        "tags": message.tags,
+                        "message": message.message,
+                    },
+                )
+
+    def _get(self, *args, **kwargs):
+        return [], True