buildTransaction method

Future<IoTransaction> buildTransaction(List<Txo> txos, String? someChangeFellowship, String? someChangeContract, int? someChangeState, Lock_Predicate predicateFundsToUnlock, Lock lockForChange, LockAddress recipientLockAddress, int amount, int fee, Indices? someNextIndices, KeyPair keyPair, ValueTypeIdentifier typeIdentifier,)

Builds a transaction.

Throws a CannotSerializeProtobufFile if there is a problem serializing the transaction.

Implementation

Future<IoTransaction> buildTransaction(
  List<Txo> txos,
  String? someChangeFellowship,
  String? someChangeContract,
  int? someChangeState,
  Lock_Predicate predicateFundsToUnlock,
  Lock lockForChange,
  LockAddress recipientLockAddress,
  int amount,
  int fee,
  Indices? someNextIndices,
  KeyPair keyPair,
  ValueTypeIdentifier typeIdentifier,
) async {
  try {
    final lockChange = await transactionBuilderApi.lockAddress(lockForChange);
    final eitherIoTransaction =
        await transactionBuilderApi.buildTransferAmountTransaction(
      typeIdentifier,
      txos,
      predicateFundsToUnlock,
      amount,
      recipientLockAddress,
      lockChange,
      fee,
    );

    final ioTransaction = eitherIoTransaction.fold((l) => throw l, (r) => r);

    bool nextIndicesExist = false;
    if (someChangeFellowship != null &&
        someChangeContract != null &&
        someChangeState != null) {
      nextIndicesExist = !(walletStateApi.getCurrentIndicesForFunds(
            someChangeFellowship,
            someChangeContract,
            someChangeState,
          ) ==
          null);
    }

    if (ioTransaction.outputs.length >= 2 && !nextIndicesExist) {
      final lockAddress =
          await transactionBuilderApi.lockAddress(lockForChange);
      final vk = someNextIndices != null
          ? walletApi.deriveChildKeys(keyPair, someNextIndices)
          : null;

      walletStateApi.updateWalletState(
        Encoding()
            .encodeToBase58Check(lockForChange.predicate.writeToBuffer()),
        AddressCodecs.encode(lockAddress),
        vk != null ? "ExtendedEd25519" : null,
        vk != null ? Encoding().encodeToBase58(vk.writeToBuffer()) : null,
        someNextIndices!, // TODO(ultimaterex): Figure out why nullable is allowed but we don't have a null path
      );
    }
    return ioTransaction;
  } catch (e) {
    throw CannotSerializeProtobufFile('Cannot write to file');
  }
}