handler method

Future<Response?> handler(Request request)

Implementation

Future<Response?> handler(Request request) async {
  final body = await request.readAsString();
  final rq = json.decode(body) as Map<String, dynamic>;
  final method = rq['method'] as String?;
  final params = rq['params'];
  final id = rq['id'];
  if (!_methods.containsKey(method)) {
    return null;
  }

  try {
    final rs = await _methods[method!]!(params);
    return Response(
      200,
      body: json.encode({
        if (!_omitRpcVersion) 'jsonrpc': '2.0',
        if (id != null) 'id': id,
        'result': rs,
      }),
      headers: {
        'Content-Type': 'application/json',
      },
    );
  } catch (e, _) {
    final ex = e is RpcException ? e : ServerException(e.toString());
    final error = {
      'code': ex.code,
      'message': ex.message,
      if (ex.data != null) 'data': ex.data,
    };

    return Response(
      400,
      body: json.encode({
        if (!_omitRpcVersion) 'jsonrpc': '2.0',
        if (id != null) 'id': id,
        'error': error,
      }),
      headers: {
        'Content-Type': 'application/json',
      },
    );
  }
}