Make v2transport default for addnode RPC when enabled

Author: sipa

src/rpc/net.cpp

@@ -313,7 +313,7 @@ static RPCHelpMan addnode()
                 {
                     {"node", RPCArg::Type::STR, RPCArg::Optional::NO, "The address of the peer to connect to"},
                     {"command", RPCArg::Type::STR, RPCArg::Optional::NO, "'add' to add a node to the list, 'remove' to remove a node from the list, 'onetry' to try a connection to the node once"},
-                    {"v2transport", RPCArg::Type::BOOL, RPCArg::Default{false}, "Attempt to connect using BIP324 v2 transport protocol (ignored for 'remove' command)"},
+                    {"v2transport", RPCArg::Type::BOOL, RPCArg::DefaultHint{"set by -v2transport"}, "Attempt to connect using BIP324 v2 transport protocol (ignored for 'remove' command)"},
                 },
                 RPCResult{RPCResult::Type::NONE, "", ""},
                 RPCExamples{
@@ -332,9 +332,10 @@ static RPCHelpMan addnode()
     CConnman& connman = EnsureConnman(node);
 
     const std::string node_arg{request.params[0].get_str()};
-    bool use_v2transport = self.Arg<bool>(2);
+    bool node_v2transport = connman.GetLocalServices() & NODE_P2P_V2;
+    bool use_v2transport = self.MaybeArg<bool>(2).value_or(node_v2transport);
 
-    if (use_v2transport && !(node.connman->GetLocalServices() & NODE_P2P_V2)) {
+    if (use_v2transport && !node_v2transport) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Error: v2transport requested but not enabled (see -v2transport)");
     }
 

test/functional/test_framework/test_framework.py

@@ -602,10 +602,10 @@ def connect_nodes(self, a, b, *, peer_advertises_v2=None, wait_for_connect: bool
         if peer_advertises_v2 is None:
             peer_advertises_v2 = from_connection.use_v2transport
 
-        if peer_advertises_v2:
-            from_connection.addnode(node=ip_port, command="onetry", v2transport=True)
+        if peer_advertises_v2 != from_connection.use_v2transport:
+            from_connection.addnode(node=ip_port, command="onetry", v2transport=peer_advertises_v2)
         else:
-            # skip the optional third argument (default false) for
+            # skip the optional third argument if it matches the default, for
             # compatibility with older clients
             from_connection.addnode(ip_port, "onetry")