vmtxbuilder

package
v0.3.2 Latest Latest
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 Go to latest Published: Sep 21, 2022 License: Apache-2.0, BSD-2-Clause Imports: 16 Imported by: 0

Documentation

Overview

Package vmtxbuilder implements AnchorTransactionBuilder, a transaction builder used by the VM to construct anchor transaction. The AnchorTransactionBuilder keeps consistent state along operations of adding inputs and adding outputs (`Consume` and `AddOutput`). Total base tokens available to on-chain accounts are kept in the anchor output. The builder automatically maintains `internal` outputs which holds on-chain total balances of native tokens: one UTXO for one non-zero balance of iotago.NativeTokenID. Whenever native tokens are moved to/form the chain, those internal UTXO are updated by consuming input/producing output. The builder automatically ensures necessary minimal storage deposit on each of internal outputs. For this, builder takes base tokens from the total base tokens on the chain or puts them back, depending on the needs of internal outputs. When txbuilder is unable to maintain consistent state, it panics. The following panic code are possible: - ErrProtocolExceptionInputLimitExceeded when maximum number of inputs in the transaction is exceeded - ErrProtocolExceptionOutputLimitExceeded when maximum number of outputs in the transaction is exceeded - ErrProtocolExceptionNumberOfNativeTokensLimitExceeded when number of total different tokenIDs is exceeded - ErrProtocolExceptionNotEnoughFundsForInternalStorageDeposit when total number of base tokens available is not enough for storage deposit of the new internal output - ErrNotEnoughBaseTokensBalance attempt to debit more base tokens than possible - ErrNotEnoughNativeAssetBalance attempt to debit more native tokens than possible - ErrOverflow overflow of arithmetics

Index

Constants

This section is empty.

Variables

View Source 
var DebugTxBuilder = true

Functions

This section is empty.

Types

type AnchorTransactionBuilder 

type AnchorTransactionBuilder struct {
	// contains filtered or unexported fields
}

AnchorTransactionBuilder represents structure which handles all the data needed to eventually build an essence of the anchor transaction

func NewAnchorTransactionBuilder 

func NewAnchorTransactionBuilder(
	anchorOutput *iotago.AliasOutput,
	anchorOutputID iotago.OutputID,
	tokenBalanceLoader tokenOutputLoader,
	foundryLoader foundryLoader,
	nftLoader NFTOutputLoader,
	storageDepositAssumptions transaction.StorageDepositAssumption,
) *AnchorTransactionBuilder

NewAnchorTransactionBuilder creates new AnchorTransactionBuilder object

func (*AnchorTransactionBuilder) AddOutput 

func (txb *AnchorTransactionBuilder) AddOutput(o iotago.Output) int64

AddOutput adds an information about posted request. It will produce output Return adjustment needed for the L2 ledger (adjustment on base tokens related to storage deposit)

func (*AnchorTransactionBuilder) AssertConsistentWithL2Totals 

func (txb *AnchorTransactionBuilder) AssertConsistentWithL2Totals(l2Totals *isc.FungibleTokens, checkpoint string)

func (*AnchorTransactionBuilder) BuildTransactionEssence 

func (txb *AnchorTransactionBuilder) BuildTransactionEssence(l1Commitment *state.L1Commitment) (*iotago.TransactionEssence, []byte)

BuildTransactionEssence builds transaction essence from tx builder data

func (*AnchorTransactionBuilder) Clone 

func (txb *AnchorTransactionBuilder) Clone() *AnchorTransactionBuilder

Clone clones the AnchorTransactionBuilder object. Used to snapshot/recover

func (*AnchorTransactionBuilder) Consume 

func (txb *AnchorTransactionBuilder) Consume(req isc.OnLedgerRequest) int64

Consume adds an input to the transaction. It panics if transaction cannot hold that many inputs All explicitly consumed inputs will hold fixed index in the transaction It updates total assets held by the chain. So it may panic due to exceed output counts Returns delta of base tokens needed to adjust the common account due to storage deposit requirement for internal UTXOs NOTE: if call panics with ErrNotEnoughFundsForInternalStorageDeposit, the state of the builder becomes inconsistent It means, in the caller context it should be rolled back altogether

func (*AnchorTransactionBuilder) CreateNewFoundry 

func (txb *AnchorTransactionBuilder) CreateNewFoundry(
	scheme iotago.TokenScheme,
	metadata []byte,
) (uint32, uint64)

func (*AnchorTransactionBuilder) DestroyFoundry 

func (txb *AnchorTransactionBuilder) DestroyFoundry(sn uint32) uint64

DestroyFoundry destroys existing foundry. Return storage deposit

func (*AnchorTransactionBuilder) FoundriesToBeUpdated 

func (txb *AnchorTransactionBuilder) FoundriesToBeUpdated() ([]uint32, []uint32)

func (*AnchorTransactionBuilder) FoundryOutputsBySN 

func (txb *AnchorTransactionBuilder) FoundryOutputsBySN(serNums []uint32) map[uint32]*iotago.FoundryOutput

func (*AnchorTransactionBuilder) InputsAreFull 

func (txb *AnchorTransactionBuilder) InputsAreFull() bool

InputsAreFull returns if transaction cannot hold more inputs

func (*AnchorTransactionBuilder) InternalNativeTokenBalances 

func (txb *AnchorTransactionBuilder) InternalNativeTokenBalances() (map[iotago.NativeTokenID]*big.Int, map[iotago.NativeTokenID]*big.Int)

InternalNativeTokenBalances returns internally maintained balances of native tokens in inputs and

func (*AnchorTransactionBuilder) ModifyNativeTokenSupply 

func (txb *AnchorTransactionBuilder) ModifyNativeTokenSupply(tokenID *iotago.NativeTokenID, delta *big.Int) int64

ModifyNativeTokenSupply inflates the supply is delta > 0, shrinks if delta < 0 returns adjustment of the storage deposit.

func (*AnchorTransactionBuilder) MustBalanced 

func (txb *AnchorTransactionBuilder) MustBalanced(checkpoint string)

func (*AnchorTransactionBuilder) NFTOutputs 

func (txb *AnchorTransactionBuilder) NFTOutputs() []*iotago.NFTOutput

func (*AnchorTransactionBuilder) NFTOutputsToBeUpdated 

func (txb *AnchorTransactionBuilder) NFTOutputsToBeUpdated() (toBeAdded, toBeRemoved []*iotago.NFTOutput)

func (*AnchorTransactionBuilder) NativeTokenOutputsByTokenIDs 

func (txb *AnchorTransactionBuilder) NativeTokenOutputsByTokenIDs(ids []iotago.NativeTokenID) map[iotago.NativeTokenID]*iotago.BasicOutput

func (*AnchorTransactionBuilder) NativeTokenRecordsToBeUpdated 

func (txb *AnchorTransactionBuilder) NativeTokenRecordsToBeUpdated() ([]iotago.NativeTokenID, []iotago.NativeTokenID)

func (*AnchorTransactionBuilder) String 

func (txb *AnchorTransactionBuilder) String() string

func (*AnchorTransactionBuilder) TotalBaseTokensInL2Accounts 

func (txb *AnchorTransactionBuilder) TotalBaseTokensInL2Accounts() uint64

TotalBaseTokensInL2Accounts returns number of on-chain base tokens. It does not include minimum storage deposit needed for anchor output and other internal UTXOs

func (*AnchorTransactionBuilder) TotalBaseTokensInOutputs 

func (txb *AnchorTransactionBuilder) TotalBaseTokensInOutputs() (uint64, uint64)

TotalBaseTokensInOutputs returns (a) total base tokens owned by SCs and (b) total base tokens locked as storage deposit

func (*AnchorTransactionBuilder) Totals 

func (txb *AnchorTransactionBuilder) Totals() (*TransactionTotals, *TransactionTotals, error)

Totals check consistency. If input total equals with output totals, returns (base tokens total, native token totals, true) Otherwise returns (0, nil, false)

type NFTOutputLoader 

type NFTOutputLoader func(id iotago.NFTID) (*iotago.NFTOutput, *iotago.UTXOInput)

NFTOutputLoader externally supplied function which returns the stored NFT output from the state Should return nil if NFT is not accounted for

type TransactionTotals 

type TransactionTotals struct {
	// does not include internal storage deposits
	TotalBaseTokensInL2Accounts uint64
	// internal storage deposit
	TotalBaseTokensInStorageDeposit uint64
	// balances of native tokens (in all inputs/outputs). In the tx builder only loaded those which are needed
	NativeTokenBalances map[iotago.NativeTokenID]*big.Int
	// token supplies in foundries
	TokenCirculatingSupplies map[iotago.NativeTokenID]*big.Int
	// base tokens sent out by the transaction
	SentOutBaseTokens uint64
	// Sent out native tokens by the transaction
	SentOutTokenBalances map[iotago.NativeTokenID]*big.Int
}

func (*TransactionTotals) BalancedWith 

func (t *TransactionTotals) BalancedWith(another *TransactionTotals) error

Source Files

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