Update examples to use dynamic host IP instead of hardcoded localhost

examples/doc-examples/example_quic_transport.py

@@ -1,6 +1,5 @@
 import secrets
 
-import multiaddr
 import trio
 
 from libp2p import (
@@ -9,6 +8,10 @@ from libp2p import (
 from libp2p.crypto.secp256k1 import (
     create_new_key_pair,
 )
+from libp2p.utils.address_validation import (
+    get_available_interfaces,
+    get_optimal_binding_address,
+)
 
 
 async def main():
@@ -19,14 +22,24 @@ async def main():
     # Create a host with the key pair
     host = new_host(key_pair=key_pair, enable_quic=True)
 
-    # Configure the listening address
+    # Configure the listening address using the new paradigm
     port = 8000
-    listen_addr = multiaddr.Multiaddr(f"/ip4/127.0.0.1/udp/{port}/quic-v1")
+    listen_addrs = get_available_interfaces(port, protocol="udp")
+    # Convert TCP addresses to QUIC-v1 addresses
+    quic_addrs = []
+    for addr in listen_addrs:
+        addr_str = str(addr).replace("/tcp/", "/udp/") + "/quic-v1"
+        from multiaddr import Multiaddr
+        quic_addrs.append(Multiaddr(addr_str))
+
+    optimal_addr = get_optimal_binding_address(port, protocol="udp")
+    optimal_quic_str = str(optimal_addr).replace("/tcp/", "/udp/") + "/quic-v1"
 
     # Start the host
-    async with host.run(listen_addrs=[listen_addr]):
+    async with host.run(listen_addrs=quic_addrs):
         print("libp2p has started with QUIC transport")
         print("libp2p is listening on:", host.get_addrs())
+        print(f"Optimal address: {optimal_quic_str}")
         # Keep the host running
         await trio.sleep_forever()