sendMessage method

Implementation

Future<String> sendMessage(String messageJson, {String? extraContext}) async {
  _assertInitialized();
  _assertConversation();
  final b = _bindings!;

  final messagePtr = messageJson.toNativeUtf8();
  final extraPtr =
      extraContext != null ? extraContext.toNativeUtf8() : nullptr;

  try {
    final response = b.litert_lm_conversation_send_message(
      _conversation!,
      messagePtr.cast(),
      extraPtr == nullptr ? nullptr : extraPtr.cast(),
    );

    if (response == nullptr) {
      throw Exception('send_message returned null');
    }

    final strPtr = b.litert_lm_json_response_get_string(response);
    final result =
        strPtr == nullptr ? '' : strPtr.cast<Utf8>().toDartString();
    b.litert_lm_json_response_delete(response);
    return result;
  } finally {
    calloc.free(messagePtr);
    if (extraPtr != nullptr) calloc.free(extraPtr);
  }
}