core/txpool/blobpool: reduce overhead in benchmark, make blobpool validation-function settable

The benchmarks for assembling the pending lazy-tx lists were extremely intense in setup,

1. writing a lot of data to disk, and
2. performing a lot of expensive blob validations.

This change fixes both, by replacing billy with a no-op store, and
replacing the blobpool validation function with a yes-dummy.

core/txpool/blobpool/blobpool.go

@@ -318,6 +318,10 @@ type BlobPool struct {
 	discoverFeed event.Feed // Event feed to send out new tx events on pool discovery (reorg excluded)
 	insertFeed   event.Feed // Event feed to send out new tx events on pool inclusion (reorg included)
 
+	// txValidationFn defaults to txpool.ValidateTransaction, but can be
+	// overridden for testing purposes.
+	txValidationFn txpool.ValidationFunction
+
 	lock sync.RWMutex // Mutex protecting the pool during reorg handling
 }
 
@@ -329,12 +333,13 @@ func New(config Config, chain BlockChain) *BlobPool {
 
 	// Create the transaction pool with its initial settings
 	return &BlobPool{
-		config: config,
-		signer: types.LatestSigner(chain.Config()),
-		chain:  chain,
-		lookup: newLookup(),
-		index:  make(map[common.Address][]*blobTxMeta),
-		spent:  make(map[common.Address]*uint256.Int),
+		config:         config,
+		signer:         types.LatestSigner(chain.Config()),
+		chain:          chain,
+		lookup:         newLookup(),
+		index:          make(map[common.Address][]*blobTxMeta),
+		spent:          make(map[common.Address]*uint256.Int),
+		txValidationFn: txpool.ValidateTransaction,
 	}
 }
 
@@ -1090,7 +1095,8 @@ func (p *BlobPool) validateTx(tx *types.Transaction) error {
 		MaxSize: txMaxSize,
 		MinTip:  p.gasTip.ToBig(),
 	}
-	if err := txpool.ValidateTransaction(tx, p.head, p.signer, baseOpts); err != nil {
+
+	if err := p.txValidationFn(tx, p.head, p.signer, baseOpts); err != nil {
 		return err
 	}
 	// Ensure the transaction adheres to the stateful pool filters (nonce, balance)

core/txpool/blobpool/blobpool_test.go

@@ -1449,11 +1449,29 @@ func TestAdd(t *testing.T) {
 	}
 }
 
+// fakeBilly is a billy.Database implementation which just drops data on the floor.
+type fakeBilly struct {
+	billy.Database
+	count uint64
+}
+
+func (f *fakeBilly) Put(data []byte) (uint64, error) {
+	f.count++
+	return f.count, nil
+}
+
+var _ billy.Database = (*fakeBilly)(nil)
+
 // Benchmarks the time it takes to assemble the lazy pending transaction list
 // from the pool contents.
 func BenchmarkPoolPending100Mb(b *testing.B) { benchmarkPoolPending(b, 100_000_000) }
 func BenchmarkPoolPending1GB(b *testing.B)   { benchmarkPoolPending(b, 1_000_000_000) }
-func BenchmarkPoolPending10GB(b *testing.B)  { benchmarkPoolPending(b, 10_000_000_000) }
+func BenchmarkPoolPending10GB(b *testing.B) {
+	if testing.Short() {
+		b.Skip("Skipping in short-mode")
+	}
+	benchmarkPoolPending(b, 10_000_000_000)
+}
 
 func benchmarkPoolPending(b *testing.B, datacap uint64) {
 	// Calculate the maximum number of transaction that would fit into the pool
@@ -1477,6 +1495,15 @@ func benchmarkPoolPending(b *testing.B, datacap uint64) {
 	if err := pool.Init(1, chain.CurrentBlock(), makeAddressReserver()); err != nil {
 		b.Fatalf("failed to create blob pool: %v", err)
 	}
+	// Make the pool not use disk (just drop everything). This test never reads
+	// back the data, it just iterates over the pool in-memory items
+	pool.store = &fakeBilly{pool.store, 0}
+	// Avoid validation - verifying all blob proofs take significant time
+	// when the capacity is large. The purpose of this bench is to measure assembling
+	// the lazies, not the kzg verifications.
+	pool.txValidationFn = func(tx *types.Transaction, head *types.Header, signer types.Signer, opts *txpool.ValidationOptions) error {
+		return nil // accept all
+	}
 	// Fill the pool up with one random transaction from each account with the
 	// same price and everything to maximize the worst case scenario
 	for i := 0; i < int(capacity); i++ {

core/txpool/validation.go

@@ -47,6 +47,11 @@ type ValidationOptions struct {
 	MinTip  *big.Int // Minimum gas tip needed to allow a transaction into the caller pool
 }
 
+// ValidationFunction is an method type which the pools use to perform the tx-validations which do not
+// require state access. Production code typically uses ValidateTransaction, whereas testing-code
+// might choose to instead use something else, e.g. to always fail or avoid heavy cpu usage.
+type ValidationFunction func(tx *types.Transaction, head *types.Header, signer types.Signer, opts *ValidationOptions) error
+
 // ValidateTransaction is a helper method to check whether a transaction is valid
 // according to the consensus rules, but does not check state-dependent validation
 // (balance, nonce, etc).