add routing interfaces

libp2p/routing/kadmelia/kadmelia_peer_router.py

@@ -0,0 +1,30 @@
+from libp2p.routing.interfaces import IPeerRouting
+from libp2p.kademlia.utils import digest
+from libp2p.peer.peerinfo import PeerInfo
+from libp2p.peer.peerdata import PeerData
+
+
+class KadmeliaPeerRouter(IPeerRouting):
+
+    def __init__(self, dht_server):
+        self.server = dht_server
+
+    def find_peer(self, peer_id):
+        """
+        Find specific Peer
+        FindPeer searches for a peer with given peer_id, returns a peer.PeerInfo
+        with relevant addresses.
+        """
+        value = self.server.get(peer_id)
+        return decode_peerinfo(value)
+
+
+def decode_peerinfo(encoded):
+    if isinstance(encoded, bytes):
+        encoded = encoded.decode()
+    lines = encoded.splitlines()
+    peer_id = lines[0]
+    addrs = lines[1:]
+    peer_data = PeerData()
+    peer_data.add_addrs(addrs)
+    return PeerInfo(peer_id, addrs)