refactor create dht value

veilid-flutter/lib/routing_context.dart

@@ -234,8 +234,8 @@ abstract class VeilidRoutingContext {
   Future<void> appMessage(String target, Uint8List message);
 
   // DHT Operations
-  Future<DHTRecordDescriptor> createDHTRecord(
-      CryptoKind kind, DHTSchema schema);
+  Future<DHTRecordDescriptor> createDHTRecord(DHTSchema schema,
+      {CryptoKind kind = 0});
   Future<DHTRecordDescriptor> openDHTRecord(TypedKey key, KeyPair? writer);
   Future<void> closeDHTRecord(TypedKey key);
   Future<void> deleteDHTRecord(TypedKey key);

veilid-flutter/lib/veilid_ffi.dart

@@ -78,9 +78,9 @@ typedef _RoutingContextAppMessageDart = void Function(
     int, int, Pointer<Utf8>, Pointer<Utf8>);
 // fn routing_context_create_dht_record(port: i64, id: u32, kind: u32, schema: FfiStr)
 typedef _RoutingContextCreateDHTRecordC = Void Function(
-    Int64, Uint32, Uint32, Pointer<Utf8>);
+    Int64, Uint32, Pointer<Utf8>, Uint32);
 typedef _RoutingContextCreateDHTRecordDart = void Function(
-    int, int, int, Pointer<Utf8>);
+    int, int, Pointer<Utf8>, int);
 // fn routing_context_open_dht_record(port: i64, id: u32, key: FfiStr, writer: FfiStr)
 typedef _RoutingContextOpenDHTRecordC = Void Function(
     Int64, Uint32, Pointer<Utf8>, Pointer<Utf8>);
@@ -634,13 +634,13 @@ class VeilidRoutingContextFFI implements VeilidRoutingContext {
   }
 
   @override
-  Future<DHTRecordDescriptor> createDHTRecord(
-      CryptoKind kind, DHTSchema schema) async {
+  Future<DHTRecordDescriptor> createDHTRecord(DHTSchema schema,
+      {CryptoKind kind = 0}) async {
     final nativeSchema = jsonEncode(schema).toNativeUtf8();
     final recvPort = ReceivePort("routing_context_create_dht_record");
     final sendPort = recvPort.sendPort;
     _ctx.ffi._routingContextCreateDHTRecord(
-        sendPort.nativePort, _ctx.id, kind, nativeSchema);
+        sendPort.nativePort, _ctx.id, nativeSchema, kind);
     final dhtRecordDescriptor =
         await processFutureJson(DHTRecordDescriptor.fromJson, recvPort.first);
     return dhtRecordDescriptor;

veilid-flutter/lib/veilid_js.dart

@@ -78,11 +78,11 @@ class VeilidRoutingContextJS implements VeilidRoutingContext {
   }
 
   @override
-  Future<DHTRecordDescriptor> createDHTRecord(
-      CryptoKind kind, DHTSchema schema) async {
+  Future<DHTRecordDescriptor> createDHTRecord(DHTSchema schema,
+      {CryptoKind kind = 0}) async {
     return DHTRecordDescriptor.fromJson(jsonDecode(await _wrapApiPromise(js_util
         .callMethod(wasm, "routing_context_create_dht_record",
-            [_ctx.id, kind, jsonEncode(schema)]))));
+            [_ctx.id, jsonEncode(schema), kind]))));
   }
 
   @override

veilid-flutter/rust/src/dart_ffi.rs

@@ -492,8 +492,12 @@ pub extern "C" fn routing_context_app_message(port: i64, id: u32, target: FfiStr
 }
 
 #[no_mangle]
-pub extern "C" fn routing_context_create_dht_record(port: i64, id: u32, kind: u32, schema: FfiStr) {
-    let crypto_kind: veilid_core::CryptoKind = veilid_core::FourCC::from(kind);
+pub extern "C" fn routing_context_create_dht_record(port: i64, id: u32, schema: FfiStr, kind: u32) {
+    let crypto_kind = if kind == 0 {
+        None
+    } else {
+        Some(veilid_core::FourCC::from(kind))
+    };
     let schema: veilid_core::DHTSchema = veilid_core::deserialize_opt_json(schema.into_opt_string()).unwrap();
 
     DartIsolateWrapper::new(port).spawn_result_json(async move {        
@@ -505,7 +509,7 @@ pub extern "C" fn routing_context_create_dht_record(port: i64, id: u32, kind: u3
             routing_context.clone()
         };
         
-        let dht_record_descriptor = routing_context.create_dht_record(crypto_kind, schema).await?;
+        let dht_record_descriptor = routing_context.create_dht_record(schema, crypto_kind).await?;
         APIResult::Ok(dht_record_descriptor)
     });
 }