core/txpool/legacypool: respect nolocals-setting (#28435)

This change adds a check to ensure that transactions added to the legacy pool are not treated as 'locals' if the global locals-management has been disabled. 

This change makes the pool enforce the --txpool.pricelimit setting.

core/txpool/legacypool/legacypool.go

@@ -993,6 +993,9 @@ func (pool *LegacyPool) addRemoteSync(tx *types.Transaction) error {
 // If sync is set, the method will block until all internal maintenance related
 // to the add is finished. Only use this during tests for determinism!
 func (pool *LegacyPool) Add(txs []*types.Transaction, local, sync bool) []error {
+	// Do not treat as local if local transactions have been disabled
+	local = local && !pool.config.NoLocals
+
 	// Filter out known ones without obtaining the pool lock or recovering signatures
 	var (
 		errs = make([]error, len(txs))

core/txpool/legacypool/legacypool_test.go

@@ -1492,6 +1492,50 @@ func TestRepricing(t *testing.T) {
 	}
 }
 
+func TestMinGasPriceEnforced(t *testing.T) {
+	t.Parallel()
+
+	// Create the pool to test the pricing enforcement with
+	statedb, _ := state.New(types.EmptyRootHash, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
+	blockchain := newTestBlockChain(eip1559Config, 10000000, statedb, new(event.Feed))
+
+	txPoolConfig := DefaultConfig
+	txPoolConfig.NoLocals = true
+	pool := New(txPoolConfig, blockchain)
+	pool.Init(new(big.Int).SetUint64(txPoolConfig.PriceLimit), blockchain.CurrentBlock(), makeAddressReserver())
+	defer pool.Close()
+
+	key, _ := crypto.GenerateKey()
+	testAddBalance(pool, crypto.PubkeyToAddress(key.PublicKey), big.NewInt(1000000))
+
+	tx := pricedTransaction(0, 100000, big.NewInt(2), key)
+	pool.SetGasTip(big.NewInt(tx.GasPrice().Int64() + 1))
+
+	if err := pool.addLocal(tx); !errors.Is(err, txpool.ErrUnderpriced) {
+		t.Fatalf("Min tip not enforced")
+	}
+
+	if err := pool.Add([]*types.Transaction{tx}, true, false)[0]; !errors.Is(err, txpool.ErrUnderpriced) {
+		t.Fatalf("Min tip not enforced")
+	}
+
+	tx = dynamicFeeTx(0, 100000, big.NewInt(3), big.NewInt(2), key)
+	pool.SetGasTip(big.NewInt(tx.GasTipCap().Int64() + 1))
+
+	if err := pool.addLocal(tx); !errors.Is(err, txpool.ErrUnderpriced) {
+		t.Fatalf("Min tip not enforced")
+	}
+
+	if err := pool.Add([]*types.Transaction{tx}, true, false)[0]; !errors.Is(err, txpool.ErrUnderpriced) {
+		t.Fatalf("Min tip not enforced")
+	}
+	// Make sure the tx is accepted if locals are enabled
+	pool.config.NoLocals = false
+	if err := pool.Add([]*types.Transaction{tx}, true, false)[0]; err != nil {
+		t.Fatalf("Min tip enforced with locals enabled, error: %v", err)
+	}
+}
+
 // Tests that setting the transaction pool gas price to a higher value correctly
 // discards everything cheaper (legacy & dynamic fee) than that and moves any
 // gapped transactions back from the pending pool to the queue.