added event emmiter

libp2p/discovery/events/peerDiscovery.py

@@ -0,0 +1,37 @@
+from collections.abc import (
+    Awaitable,
+    Callable,
+)
+
+import trio
+
+from libp2p.abc import (
+    PeerInfo,
+)
+
+TTL: int = 60 * 60  # Time-to-live for discovered peers in seconds
+
+
+class PeerDiscovery:
+    def __init__(self) -> None:
+        self._peer_discovered_handlers: list[Callable[[PeerInfo], Awaitable[None]]] = []
+
+    def register_peer_discovered_handler(
+        self, handler: Callable[[PeerInfo], Awaitable[None]]
+    ) -> None:
+        self._peer_discovered_handlers.append(handler)
+
+    async def emit_peer_discovered(self, peer_info: PeerInfo) -> None:
+        for handler in self._peer_discovered_handlers:
+            await handler(peer_info)
+
+
+peerDiscovery = PeerDiscovery()
+
+
+async def peerDiscoveryHandler(peerInfo: PeerInfo) -> None:
+    await trio.sleep(5)  # Simulate some processing delay
+    # print("Discovered peer is", peerInfo.peer_id)
+
+
+peerDiscovery.register_peer_discovered_handler(peerDiscoveryHandler)