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package chainwriter
import "Chain/pkg/pro"
// UndoBlock is used to reverse the side effects causes by a Block.
// When the chain reverts a block's Transactions, it must both (1)
// remove newly created TransactionOutputs and (2) convert
// TransactionInputs back into available TransactionOutputs.
// This struct helps with (2).
// TransactionInputHashes are the hashes of the TransactionInputs that
// the UndoBlock must revert.
// OutputIndexes are the OutputIndexes of the TransactionInputs.
// Amounts are the amounts of the parent TransactionOutputs.
// LockingScripts are the locking scripts of the parent TransactionOutputs.
type UndoBlock struct {
TransactionInputHashes []string
OutputIndexes []uint32
Amounts []uint32
LockingScripts []string
}
// EncodeUndoBlock returns a pro.UndoBlock given an UndoBlock.
func EncodeUndoBlock(ub *UndoBlock) *pro.UndoBlock {
var transactionInputHashes []string
var outputIndexes []uint32
var amounts []uint32
var lockingScripts []string
for i := 0; i < len(ub.TransactionInputHashes); i++ {
transactionInputHashes = append(transactionInputHashes, ub.TransactionInputHashes[i])
outputIndexes = append(outputIndexes, ub.OutputIndexes[i])
amounts = append(amounts, ub.Amounts[i])
lockingScripts = append(lockingScripts, ub.LockingScripts[i])
}
return &pro.UndoBlock{
TransactionInputHashes: transactionInputHashes,
OutputIndexes: outputIndexes,
Amounts: amounts,
LockingScripts: lockingScripts,
}
}
// DecodeUndoBlock returns an UndoBlock given a pro.UndoBlock
func DecodeUndoBlock(pub *pro.UndoBlock) *UndoBlock {
var transactionInputHashes []string
var outputIndexes []uint32
var amounts []uint32
var lockingScripts []string
for i := 0; i < len(pub.GetTransactionInputHashes()); i++ {
transactionInputHashes = append(transactionInputHashes, pub.GetTransactionInputHashes()[i])
outputIndexes = append(outputIndexes, pub.GetOutputIndexes()[i])
amounts = append(amounts, pub.GetAmounts()[i])
lockingScripts = append(lockingScripts, pub.GetLockingScripts()[i])
}
return &UndoBlock{
TransactionInputHashes: transactionInputHashes,
OutputIndexes: outputIndexes,
Amounts: amounts,
LockingScripts: lockingScripts,
}
}
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