Initial commit

.venv/lib/python3.9/site-packages/aiohttp/signals.py

@@ -0,0 +1,34 @@
+from aiohttp.frozenlist import FrozenList
+
+__all__ = ("Signal",)
+
+
+class Signal(FrozenList):
+    """Coroutine-based signal implementation.
+
+    To connect a callback to a signal, use any list method.
+
+    Signals are fired using the send() coroutine, which takes named
+    arguments.
+    """
+
+    __slots__ = ("_owner",)
+
+    def __init__(self, owner):
+        super().__init__()
+        self._owner = owner
+
+    def __repr__(self):
+        return "<Signal owner={}, frozen={}, {!r}>".format(
+            self._owner, self.frozen, list(self)
+        )
+
+    async def send(self, *args, **kwargs):
+        """
+        Sends data to all registered receivers.
+        """
+        if not self.frozen:
+            raise RuntimeError("Cannot send non-frozen signal.")
+
+        for receiver in self:
+            await receiver(*args, **kwargs)  # type: ignore