getMetadata method

Implementation

@override
Future<Map<String, dynamic>> getMetadata(String sessionId) async {
  try {
    // Check if the session exists
    if (!_sessions.containsKey(sessionId)) {
      throw PlatformException(code: "INVALID_SESSION", message: "Session not found", details: null);
    }

    final session = _sessions[sessionId]!;

    // Create a default metadata map with empty values
    final metadataMap = <String, dynamic>{
      'producerName': '',
      'graphName': '',
      'domain': '',
      'description': '',
      'version': 0,
      'customMetadataMap': <String, String>{},
    };

    // Check if the session has metadata property (Recent versions of ONNX Runtime JS API may have this)
    if (session.has('metadata')) {
      final metadata = session.getProperty('metadata'.toJS) as JSObject;

      // Extract metadata properties if they exist
      if (metadata.has('producerName')) {
        metadataMap['producerName'] = metadata.getProperty('producerName'.toJS).toString();
      }

      if (metadata.has('graphName')) {
        metadataMap['graphName'] = metadata.getProperty('graphName'.toJS).toString();
      }

      if (metadata.has('domain')) {
        metadataMap['domain'] = metadata.getProperty('domain'.toJS).toString();
      }

      if (metadata.has('description')) {
        metadataMap['description'] = metadata.getProperty('description'.toJS).toString();
      }

      if (metadata.has('version')) {
        metadataMap['version'] = metadata.getProperty('version'.toJS).toString();
      }

      if (metadata.has('customMetadataMap')) {
        final customMap = metadata.getProperty('customMetadataMap'.toJS) as JSObject;
        final customMetadataMap = <String, String>{};

        // Convert JavaScript object to Dart map
        // Use Object.keys() from JavaScript to get the keys of the object
        final keysObj = callMethod(objectGlobal, 'keys', [customMap]);
        final length = (keysObj.getProperty('length'.toJS) as JSNumber).toDartInt;

        for (var i = 0; i < length; i++) {
          final key = keysObj.getProperty(i.toString().toJS).toString();
          final value = customMap.getProperty(key.toJS).toString();
          customMetadataMap[key] = value;
        }

        metadataMap['customMetadataMap'] = customMetadataMap;
      }
    }

    return metadataMap;
  } catch (e) {
    if (e is PlatformException) {
      rethrow;
    }
    throw PlatformException(code: "PLUGIN_ERROR", message: "Failed to get metadata: $e", details: null);
  }
}