feat(taiko_api): reduce the frequency of zlib compression when fetching txpool content (#323)

* reduce the frequency of zlib compression when fetching txpool content

* fix go import order

* fix comment

miner/taiko_worker.go

@@ -294,19 +294,29 @@ loop:
 			env.tcount++
 			txs.Shift()
 
-			// Encode and compress the txList, if the byte length is > maxBytesPerTxList, remove the latest tx and break.
+			data, err := rlp.EncodeToBytes(env.txs)
-			b, err := encodeAndCompressTxList(env.txs)
 			if err != nil {
-				log.Trace("Failed to rlp encode and compress the pending transaction %s: %w", tx.Hash(), err)
+				log.Trace("Failed to rlp encode the pending transaction %s: %w", tx.Hash(), err)
 				txs.Pop()
 				continue
 			}
-			if len(b) > int(maxBytesPerTxList) {
+
-				env.txs = env.txs[0 : env.tcount-1]
+			if len(data) >= int(maxBytesPerTxList) {
-				env.state.RevertToSnapshot(snap)
+				// Encode and compress the txList, if the byte length is > maxBytesPerTxList, remove the latest tx and break.
-				env.gasPool.SetGas(gasPool)
+				b, err := compress(data)
-				break loop
+				if err != nil {
+					log.Trace("Failed to rlp encode and compress the pending transaction %s: %w", tx.Hash(), err)
+					txs.Pop()
+					continue
+				}
+				if len(b) > int(maxBytesPerTxList) {
+					env.txs = env.txs[0 : env.tcount-1]
+					env.state.RevertToSnapshot(snap)
+					env.gasPool.SetGas(gasPool)
+					break loop
+				}
 			}
+
 		default:
 			// Transaction is regarded as invalid, drop all consecutive transactions from
 			// the same sender because of `nonce-too-high` clause.

miner/taiko_worker_test.go

@@ -0,0 +1,50 @@
+package miner
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/consensus/clique"
+	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/stretchr/testify/assert"
+)
+
+func testGenerateWorker(t *testing.T, txCount int) *worker {
+	t.Parallel()
+	var (
+		db     = rawdb.NewMemoryDatabase()
+		config = *params.AllCliqueProtocolChanges
+	)
+	config.Taiko = true
+	config.Clique = &params.CliqueConfig{Period: 1, Epoch: 30000}
+	engine := clique.New(config.Clique, db)
+
+	w, b := newTestWorker(t, &config, engine, db, 0)
+	//defer w.close()
+
+	for i := 0; i < txCount; i++ {
+		b.txPool.Add([]*types.Transaction{b.newRandomTx(true)}, true, false)
+		b.txPool.Add([]*types.Transaction{b.newRandomTx(false)}, true, false)
+	}
+
+	return w
+}
+
+func TestBuildTransactionsLists(t *testing.T) {
+	w := testGenerateWorker(t, 1000)
+	defer w.close()
+
+	maxBytesPerTxList := (params.BlobTxBytesPerFieldElement - 1) * params.BlobTxFieldElementsPerBlob
+	txLst, err := w.BuildTransactionsLists(
+		testBankAddress,
+		nil,
+		240_000_000,
+		uint64(maxBytesPerTxList),
+		nil,
+		1,
+		0)
+	assert.NoError(t, err)
+	assert.LessOrEqual(t, 1, len(txLst))
+	assert.LessOrEqual(t, txLst[0].BytesLength, uint64(maxBytesPerTxList))
+}