refactor: update examples to use available interfaces for listening addresses and improve logging configuration

examples/mDNS/mDNS.py

@@ -2,7 +2,6 @@ import argparse
 import logging
 import secrets
 
-import multiaddr
 import trio
 
 from libp2p import (
@@ -14,6 +13,11 @@ from libp2p.crypto.secp256k1 import (
 )
 from libp2p.discovery.events.peerDiscovery import peerDiscovery
 
+# Configure minimal logging
+logging.basicConfig(level=logging.WARNING)
+logging.getLogger("multiaddr").setLevel(logging.WARNING)
+logging.getLogger("libp2p").setLevel(logging.WARNING)
+
 logger = logging.getLogger("libp2p.discovery.mdns")
 logger.setLevel(logging.INFO)
 handler = logging.StreamHandler()
@@ -22,34 +26,43 @@ handler.setFormatter(
 )
 logger.addHandler(handler)
 
-# Set root logger to DEBUG to capture all logs from dependencies
-logging.getLogger().setLevel(logging.DEBUG)
-
 
 def onPeerDiscovery(peerinfo: PeerInfo):
     logger.info(f"Discovered: {peerinfo.peer_id}")
 
 
 async def run(port: int) -> None:
+    from libp2p.utils.address_validation import find_free_port, get_available_interfaces
+
+    if port <= 0:
+        port = find_free_port()
+
     secret = secrets.token_bytes(32)
     key_pair = create_new_key_pair(secret)
-    listen_addr = multiaddr.Multiaddr(f"/ip4/127.0.0.1/tcp/{port}")
+    listen_addrs = get_available_interfaces(port)
 
     peerDiscovery.register_peer_discovered_handler(onPeerDiscovery)
 
-    print(
-        "Run this from the same folder in another console to "
-        "start another peer on a different port:\n\n"
-        "mdns-demo -p <ANOTHER_PORT>\n"
-    )
-    print("Waiting for mDNS peer discovery events...\n")
-
     logger.info("Starting peer Discovery")
     host = new_host(key_pair=key_pair, enable_mDNS=True)
-    async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
+    async with host.run(listen_addrs=listen_addrs), trio.open_nursery() as nursery:
         # Start the peer-store cleanup task
         nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
 
+        # Get all available addresses with peer ID
+        all_addrs = host.get_addrs()
+
+        print("Listener ready, listening on:")
+        for addr in all_addrs:
+            print(f"{addr}")
+
+        print(
+            "\nRun this from the same folder in another console to "
+            "start another peer on a different port:\n\n"
+            "mdns-demo -p <ANOTHER_PORT>\n"
+        )
+        print("Waiting for mDNS peer discovery events...\n")
+
         await trio.sleep_forever()