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core/txpool: disallow future churn by remote txs (#26907)

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Prior to this change, it was possible that transactions are erroneously deemed as 'future' although they are in fact 'pending', causing them to be dropped due to 'future' not being allowed to replace 'pending'. 

This change fixes that, by doing a more in-depth inspection of the queue.
This commit is contained in:
Marius van der Wijden
2023-04-05 04:59:32 -04:00
committed by GitHub
parent 2adce0b066
commit 230df98e4d
3 changed files with 51 additions and 19 deletions
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core/txpool/txpool.go
+21 -13
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@@ -745,11 +745,11 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
}
// If the new transaction is a future transaction it should never churn pending transactions
if !isLocal && pool.isFuture(from, tx) {
if !isLocal && pool.isGapped(from, tx) {
var replacesPending bool
for _, dropTx := range drop {
dropSender, _ := types.Sender(pool.signer, dropTx)
if list := pool.pending[dropSender]; list != nil && list.Overlaps(dropTx) {
if list := pool.pending[dropSender]; list != nil && list.Contains(dropTx.Nonce()) {
replacesPending = true
break
}
@@ -774,7 +774,7 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
}
// Try to replace an existing transaction in the pending pool
if list := pool.pending[from]; list != nil && list.Overlaps(tx) {
if list := pool.pending[from]; list != nil && list.Contains(tx.Nonce()) {
// Nonce already pending, check if required price bump is met
inserted, old := list.Add(tx, pool.config.PriceBump)
if !inserted {
@@ -817,18 +817,26 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
return replaced, nil
}
// isFuture reports whether the given transaction is immediately executable.
func (pool *TxPool) isFuture(from common.Address, tx *types.Transaction) bool {
list := pool.pending[from]
if list == nil {
return pool.pendingNonces.get(from) != tx.Nonce()
// isGapped reports whether the given transaction is immediately executable.
func (pool *TxPool) isGapped(from common.Address, tx *types.Transaction) bool {
// Short circuit if transaction matches pending nonce and can be promoted
// to pending list as an executable transaction.
next := pool.pendingNonces.get(from)
if tx.Nonce() == next {
return false
}
// Sender has pending transactions.
if old := list.txs.Get(tx.Nonce()); old != nil {
return false // It replaces a pending transaction.
// The transaction has a nonce gap with pending list, it's only considered
// as executable if transactions in queue can fill up the nonce gap.
queue, ok := pool.queue[from]
if !ok {
return true
}
// Not replacing, check if parent nonce exists in pending.
return list.txs.Get(tx.Nonce()-1) == nil
for nonce := next; nonce < tx.Nonce(); nonce++ {
if !queue.Contains(nonce) {
return true // txs in queue can't fill up the nonce gap
}
}
return false
}
// enqueueTx inserts a new transaction into the non-executable transaction queue.