Basic python server working including hot-reload

yacv_server/events.py

@@ -1,4 +1,5 @@
-from typing import TypeVar, Generic, List, Callable
+import asyncio
+from typing import TypeVar, Generic, List, Callable, Tuple
 
 T = TypeVar('T')
 
@@ -8,20 +9,32 @@ class EventPublisher(Generic[T]):
 
     _listeners: List[Callable[[T], None]]
     _buffer: List[T]
+    _lock: asyncio.Lock
 
     def __init__(self):
         self._listeners = []
         self._buffer = []
+        self._lock = asyncio.Lock()
 
-    def subscribe(self, listener: Callable[[T], None]):
-        self._listeners.append(listener)
-        for data in self._buffer:
-            listener(data)
+    async def subscribe(self, listener: Callable[[T], None]):
+        async with self._lock:
+            self._listeners.append(listener)
+            for data in self._buffer:
+                listener(data)
 
     def unsubscribe(self, listener: Callable[[T], None]):
-        self._listeners.remove(listener)
+        async with self._lock:
+            self._listeners.remove(listener)
 
     def emit(self, data: T):
-        self._buffer.append(data)
-        for listener in self._listeners:
-            listener(data)
+        async with self._lock:
+            self._buffer.append(data)
+            for listener in self._listeners:
+                listener(data)
+
+    def buffer(self) -> Tuple[List[T], asyncio.Lock]:
+        return self._buffer, self._lock
+
+    def clear(self):
+        async with self._lock:
+            self._buffer.clear()