Add sist2-admin, update Dockerfile & docker-compose

sist2-admin/sist2_admin/notifications.py

@@ -0,0 +1,40 @@
+import asyncio
+from typing import List
+
+
+class Notifications:
+    def __init__(self):
+        self._subscribers: List[Subscribe] = []
+
+    def subscribe(self, ob):
+        self._subscribers.append(ob)
+
+    def unsubscribe(self, ob):
+        self._subscribers.remove(ob)
+
+    def notify(self, notification: dict):
+        for ob in self._subscribers:
+            ob.notify(notification)
+
+
+class Subscribe:
+    def __init__(self, notifications: Notifications):
+        self._queue = []
+        self._notifications = notifications
+
+    async def __aenter__(self):
+        self._notifications.subscribe(self)
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        self._notifications.unsubscribe(self)
+
+    def notify(self, notification: dict):
+        self._queue.append(notification)
+
+    async def notifications(self):
+        while True:
+            try:
+                yield self._queue.pop(0)
+            except IndexError:
+                await asyncio.sleep(0.1)