[Ride v5] Invocation

⚠️ This is the documentation for the Standard Library version 5, which is currently available for Stagenet only. Go to Mainnet version

Structure that contains the fields of the script invocation that the callable function can use.

Constructor

Invocation(caller: Address, callerPublicKey: ByteVector, payments: List[AttachedPayment], transactionId: ByteVector, fee: Int, feeAssetId: ByteVector|Unit)

Fields

The field values depend on how the callable function is invoked.

If the callable function is invoked by an Invoke Script transaction:

#	Name	Data type	Description
1	caller	Address	Address of the account that sent the transaction
2	callerPublicKey	ByteVector	Public key of the account that sent the transaction
3	payments	List[AttachedPayment]	Payments indicated in the transaction
4	transactionId	ByteVector	ID of the transaction
5	fee	Int	Transaction fee
6	feeAssetId	ByteVector|Unit	ID of the fee token

If the callable function is invoked by an Invoke function:

#	Name	Data type	Description
1	caller	Address	Address of the dApp that invokes the callable function
2	callerPublicKey	ByteVector	Public key of the dApp that invokes the callable function
3	payments	List[AttachedPayment]	Payments indicated in the Invoke function
4	transactionId	ByteVector	ID of the Invoke Script transaction
5	fee	Int	Transaction fee
6	feeAssetId	ByteVector|Unit	ID of the fee token

The transactionId, fee, and feeAssetId values are the same for all dApp-to-dApp invocations within a single Invoke Script transaction.

Example: Payments Processing

The following function checks that the first payment in the Invoke Script transaction is at least 1 WAVES or 5 in the specified asset.

{-# STDLIB_VERSION 5 #-}
{-# CONTENT_TYPE DAPP #-}
{-# SCRIPT_TYPE ACCOUNT #-}

func isPaymentOk(i: Invocation) = {
  let acceptableAssetId = base58'3JmaWyFqWo8YSA8x3DXCBUW7veesxacvKx19dMv7wTMg'
  if (size(i.payments) == 0) then {
    throw("Payment not attached")
  } else {
    let p = i.payments[0]
    match p.assetId {
      case assetId: ByteVector => assetId == acceptableAssetId && p.amount >= 500000000
      case _ => p.amount >= 100000000
    }
  }
}

@Callable(i)
func foo() = {
  if isPaymentOk(i) then ([],null) else throw("Wrong payment amount or asset")
}