LNPeerAddr: validate arguments

no longer subclassing NamedTuple (as it is difficult to do validation then...)

electrum/lnutil.py

@@ -658,14 +658,31 @@ class LnGlobalFeatures(IntFlag):
 LN_GLOBAL_FEATURES_KNOWN_SET = set(LnGlobalFeatures)
 
 
-class LNPeerAddr(NamedTuple):
-    host: str
-    port: int
-    pubkey: bytes
+class LNPeerAddr:
+
+    def __init__(self, host: str, port: int, pubkey: bytes):
+        assert isinstance(host, str), repr(host)
+        assert isinstance(port, int), repr(port)
+        assert isinstance(pubkey, bytes), repr(pubkey)
+        try:
+            net_addr = NetAddress(host, port)  # this validates host and port
+        except Exception as e:
+            raise ValueError(f"cannot construct LNPeerAddr: invalid host or port (host={host}, port={port})") from e
+        # note: not validating pubkey as it would be too expensive:
+        # if not ECPubkey.is_pubkey_bytes(pubkey): raise ValueError()
+        self.host = host
+        self.port = port
+        self.pubkey = pubkey
+        self._net_addr_str = str(net_addr)
 
     def __str__(self):
-        host_and_port = str(NetAddress(self.host, self.port))
-        return '{}@{}'.format(self.pubkey.hex(), host_and_port)
+        return '{}@{}'.format(self.pubkey.hex(), self.net_addr_str())
+
+    def __repr__(self):
+        return f'<LNPeerAddr host={self.host} port={self.port} pubkey={self.pubkey.hex()}>'
+
+    def net_addr_str(self) -> str:
+        return self._net_addr_str
 
 
 def get_compressed_pubkey_from_bech32(bech32_pubkey: str) -> bytes: