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chainntnfs/txnotifier: refactor ProcessRelevantSpendTx to detect script spends

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In this commit, we refactor the TxNotifier's ProcessRelevantSpendTx to
also detect script spends. This can easily be done as the transaction
filtering logic was refactored into its own method in a previous commit.
This commit is contained in:
Wilmer Paulino 2018-12-06 21:13:56 -08:00
parent 8042d4f1c8
commit c3d5204f09
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GPG Key ID: 6DF57B9F9514972F
1 changed files with 23 additions and 26 deletions
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49
chainntnfs/txnotifier.go
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@ -870,9 +870,11 @@ func (n *TxNotifier) CancelSpend(spendRequest SpendRequest, spendID uint64) {
// ProcessRelevantSpendTx processes a transaction provided externally. This will
// check whether the transaction is relevant to the notifier if it spends any
// outputs for which we currently have registered notifications for. If it is
// relevant, spend notifications will be dispatched to the caller.
func (n *TxNotifier) ProcessRelevantSpendTx(tx *wire.MsgTx, txHeight int32) error {
// outpoints/output scripts for which we currently have registered notifications
// for. If it is relevant, spend notifications will be dispatched to the caller.
func (n *TxNotifier) ProcessRelevantSpendTx(tx *btcutil.Tx,
blockHeight uint32) error {
select {
case <-n.quit:
return ErrTxNotifierExiting
@ -884,31 +886,26 @@ func (n *TxNotifier) ProcessRelevantSpendTx(tx *wire.MsgTx, txHeight int32) erro
n.Lock()
defer n.Unlock()
// Grab the set of active registered outpoints to determine if the
// transaction spends any of them.
spendNtfns := n.spendNotifications
// We'll use a channel to coalesce all the spend requests that this
// transaction fulfills.
type spend struct {
request *SpendRequest
details *SpendDetail
}
// We'll check if this transaction spends an output that has an existing
// spend notification for it.
for i, txIn := range tx.TxIn {
// If this input doesn't spend an existing registered outpoint,
// we'll go on to the next.
prevOut := txIn.PreviousOutPoint
if _, ok := spendNtfns[prevOut]; !ok {
continue
}
// We'll set up the onSpend filter callback to gather all the fulfilled
// spends requests within this transaction.
var spends []spend
onSpend := func(request SpendRequest, details *SpendDetail) {
spends = append(spends, spend{&request, details})
}
n.filterTx(tx, nil, blockHeight, nil, onSpend)
// Otherwise, we'll create a spend summary and send off the
// details to the notification subscribers.
txHash := tx.TxHash()
details := &SpendDetail{
SpentOutPoint: &prevOut,
SpenderTxHash: &txHash,
SpendingTx: tx,
SpenderInputIndex: uint32(i),
SpendingHeight: txHeight,
}
if err := n.updateSpendDetails(prevOut, details); err != nil {
// After the transaction has been filtered, we can finally dispatch
// notifications for each request.
for _, spend := range spends {
err := n.updateSpendDetails(*spend.request, spend.details)
if err != nil {
return err
}
}