fetchBalance method

Future<Map<String, Balance>> fetchBalance(List<String> addresses, { String request = Transaction.kTransactionBalanceQueryAllFields, })

Query the network to find a balance from a list of addresses

Implementation

Future<Map<String, Balance>> fetchBalance(List<String> addresses,
    {String request = Transaction.kTransactionBalanceQueryAllFields}) async {
  if (addresses.isEmpty) {
    return {};
  }

  final fragment = 'fragment fields on Balance { $request }';
  final body = StringBuffer()..write('query { ');
  for (final address in addresses) {
    body.write(
      ' _$address: balance(address:"$address") { ...fields }',
    );
  }
  body.write(' } $fragment');
  log('fetchBalance: requestHttp.body=$body');

  final result = await _client.query(
    QueryOptions(
      document: gql(body.toString()),
      parserFn: (object) {
        final balances = object.mapValues(
          (value) => Balance.fromJson(value as Map<String, dynamic>),
          keysToIgnore: _responseKeysToIgnore,
        );
        return removeAliasPrefix(balances) ?? {};
      },
    ),
  );
  if (result.exception?.linkException != null) {
    throw ArchethicConnectionException(
      result.exception!.linkException.toString(),
    );
  }

  return result.parsedData ?? {};
}