pyln-client/gossmap: Don't mix bytes and GossmapNodeId

Do not mix bytes and GossmapNodeId when accessing Gossmap.nodes dicts.

Therefore the definion got GossmapNodeId also needed to be pulled to the
beginning of the file.

contrib/pyln-client/pyln/client/gossmap.py

@@ -50,14 +50,43 @@ def __repr__(self):
         return "GossmapHalfchannel[{}x{}]".format(str(self.channel.scid), self.direction)
 
 
+class GossmapNodeId(object):
+    def __init__(self, buf: bytes):
+        if len(buf) != 33 or (buf[0] != 2 and buf[0] != 3):
+            raise ValueError("{} is not a valid node_id".format(buf.hex()))
+        self.nodeid = buf
+
+    def to_pubkey(self) -> PublicKey:
+        return PublicKey(self.nodeid)
+
+    def __eq__(self, other):
+        if not isinstance(other, GossmapNodeId):
+            return False
+
+        return self.nodeid == other.nodeid
+
+    def __hash__(self):
+        return self.nodeid.__hash__()
+
+    def __repr__(self):
+        return "GossmapNodeId[{}]".format(self.nodeid.hex())
+
+    def from_str(self, s: str):
+        if s.startswith('0x'):
+            s = s[2:]
+        if len(s) != 67:
+            raise ValueError(f"{s} is not a valid hexstring of a node_id")
+        return GossmapNodeId(bytes.fromhex(s))
+
+
 class GossmapChannel(object):
     """A channel: fields of channel_announcement are in .fields, optional updates are in .updates_fields, which can be None if there has been no channel update."""
     def __init__(self,
                  fields: Dict[str, Any],
                  announce_offset: int,
                  scid,
-                 node1_id: bytes,
-                 node2_id: bytes,
+                 node1_id: GossmapNodeId,
+                 node2_id: GossmapNodeId,
                  is_private: bool):
         self.fields = fields
         self.announce_offset = announce_offset
@@ -96,35 +125,6 @@ def __repr__(self):
         return "GossmapChannel[{}]".format(str(self.scid))
 
 
-class GossmapNodeId(object):
-    def __init__(self, buf: bytes):
-        if len(buf) != 33 or (buf[0] != 2 and buf[0] != 3):
-            raise ValueError("{} is not a valid node_id".format(buf.hex()))
-        self.nodeid = buf
-
-    def to_pubkey(self) -> PublicKey:
-        return PublicKey(self.nodeid)
-
-    def __eq__(self, other):
-        if not isinstance(other, GossmapNodeId):
-            return False
-
-        return self.nodeid == other.nodeid
-
-    def __hash__(self):
-        return self.nodeid.__hash__()
-
-    def __repr__(self):
-        return "GossmapNodeId[{}]".format(self.nodeid.hex())
-
-    def from_str(self, s: str):
-        if s.startswith('0x'):
-            s = s[2:]
-        if len(s) != 67:
-            raise ValueError(f"{s} is not a valid hexstring of a node_id")
-        return GossmapNodeId(bytes.fromhex(s))
-
-
 class GossmapNode(object):
     """A node: fields of node_announcement are in .announce_fields, which can be None of there has been no node announcement.
 
@@ -146,7 +146,7 @@ def __init__(self, store_filename: str = "gossip_store"):
         self.store_filename = store_filename
         self.store_file = open(store_filename, "rb")
         self.store_buf = bytes()
-        self.nodes: Dict[bytes, GossmapNode] = {}
+        self.nodes: Dict[GossmapNodeId, GossmapNode] = {}
         self.channels: Dict[ShortChannelId, GossmapChannel] = {}
         self._last_scid: str = None
         version = self.store_file.read(1)