feat(host): add get_live_peers() to track connection state

libp2p/host/basic_host.py

@@ -8,12 +8,14 @@ from contextlib import (
 import logging
 from typing import (
     TYPE_CHECKING,
+    Optional,
 )
 
 import multiaddr
 
 from libp2p.abc import (
     IHost,
+    INetConn,
     INetStream,
     INetworkService,
     IPeerStore,
@@ -234,3 +236,29 @@ class BasicHost(IHost):
             return
         net_stream.set_protocol(protocol)
         await handler(net_stream)
+
+    def get_live_peers(self) -> list[ID]:
+        """
+        Returns a list of currently connected peer IDs.
+
+        :return: List of peer IDs that have active connections
+        """
+        return list(self._network.connections.keys())
+
+    def is_peer_connected(self, peer_id: ID) -> bool:
+        """
+        Check if a specific peer is currently connected.
+
+        :param peer_id: ID of the peer to check
+        :return: True if peer has an active connection, False otherwise
+        """
+        return peer_id in self._network.connections
+
+    def get_peer_connection_info(self, peer_id: ID) -> Optional[INetConn]:
+        """
+        Get connection information for a specific peer if connected.
+
+        :param peer_id: ID of the peer to get info for
+        :return: Connection object if peer is connected, None otherwise
+        """
+        return self._network.connections.get(peer_id)