python migration

server/sse_py.py

@@ -0,0 +1,32 @@
+import json
+import queue
+import threading
+
+_clients = set()
+_clients_lock = threading.Lock()
+
+
+def stream_events():
+    q = queue.Queue()
+    with _clients_lock:
+        _clients.add(q)
+
+    try:
+        yield 'data: {"type":"connected"}\n\n'
+        while True:
+            try:
+                payload = q.get(timeout=20)
+                yield f"data: {payload}\n\n"
+            except queue.Empty:
+                yield ": heartbeat\n\n"
+    finally:
+        with _clients_lock:
+            _clients.discard(q)
+
+
+def broadcast(data):
+    payload = json.dumps(data)
+    with _clients_lock:
+        clients = list(_clients)
+    for q in clients:
+        q.put_nowait(payload)