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core: remove duplication from IsDoubleClaim/IsDoubleSpend

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This commit is contained in:
Evgenii Stratonikov 2020-03-12 20:24:54 +03:00
parent cdf025bf89
commit b193e78def
1 changed files with 8 additions and 19 deletions
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27
pkg/core/dao.go
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@ -559,37 +559,26 @@ func (dao *dao) StoreAsTransaction(tx *transaction.Transaction, index uint32) er
// IsDoubleSpend verifies that the input transactions are not double spent.
func (dao *dao) IsDoubleSpend(tx *transaction.Transaction) bool {
if len(tx.Inputs) == 0 {
return false
}
for _, inputs := range transaction.GroupInputsByPrevHash(tx.Inputs) {
prevHash := inputs[0].PrevHash
unspent, err := dao.GetUnspentCoinState(prevHash)
if err != nil {
return false
}
for _, input := range inputs {
if int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&state.CoinSpent) != 0 {
return true
}
}
}
return false
return dao.checkUsedInputs(tx.Inputs, state.CoinSpent)
}
// IsDoubleClaim verifies that given claim inputs are not already claimed by another tx.
func (dao *dao) IsDoubleClaim(claim *transaction.ClaimTX) bool {
if len(claim.Claims) == 0 {
return dao.checkUsedInputs(claim.Claims, state.CoinClaimed)
}
func (dao *dao) checkUsedInputs(inputs []transaction.Input, coin state.Coin) bool {
if len(inputs) == 0 {
return false
}
for _, inputs := range transaction.GroupInputsByPrevHash(claim.Claims) {
for _, inputs := range transaction.GroupInputsByPrevHash(inputs) {
prevHash := inputs[0].PrevHash
unspent, err := dao.GetUnspentCoinState(prevHash)
if err != nil {
return true
}
for _, input := range inputs {
if int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&state.CoinClaimed) != 0 {
if int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&coin) != 0 {
return true
}
}