core, eth: minor txpool event cleanups

19 files changed, 89 insertions, 92 deletions

diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index 6262f3688..fd69538d5 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -454,7 +454,7 @@ func (fb *filterBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*ty
 	return logs, nil
 }
 
-func (fb *filterBackend) SubscribeTxPreEvent(ch chan<- core.TxsPreEvent) event.Subscription {
+func (fb *filterBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
 	return event.NewSubscription(func(quit <-chan struct{}) error {
 		<-quit
 		return nil
diff --git a/core/events.go b/core/events.go
index fee34b39d..8d200f2a2 100644
--- a/core/events.go
+++ b/core/events.go
@@ -21,8 +21,8 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
-// TxsPreEvent is posted when a batch of transactions enter the transaction pool.
-type TxsPreEvent struct{ Txs types.Transactions }
+// NewTxsEvent is posted when a batch of transactions enter the transaction pool.
+type NewTxsEvent struct{ Txs []*types.Transaction }
 
 // PendingLogsEvent is posted pre mining and notifies of pending logs.
 type PendingLogsEvent struct {
@@ -35,9 +35,6 @@ type PendingStateEvent struct{}
 // NewMinedBlockEvent is posted when a block has been imported.
 type NewMinedBlockEvent struct{ Block *types.Block }
 
-// RemovedTransactionEvent is posted when a reorg happens
-type RemovedTransactionEvent struct{ Txs types.Transactions }
-
 // RemovedLogsEvent is posted when a reorg happens
 type RemovedLogsEvent struct{ Logs []*types.Log }
 
diff --git a/core/tx_journal.go b/core/tx_journal.go
index b344690b6..1397e9fd3 100644
--- a/core/tx_journal.go
+++ b/core/tx_journal.go
@@ -76,22 +76,21 @@ func (journal *txJournal) load(add func([]*types.Transaction) []error) error {
 	stream := rlp.NewStream(input, 0)
 	total, dropped := 0, 0
 
-	// flush imports a batch of transactions and bump the appropriate progress counters
-	flush := func(txs types.Transactions) {
-		errs := add(txs)
-		for _, err := range errs {
+	// Create a method to load a limited batch of transactions and bump the
+	// appropriate progress counters. Then use this method to load all the
+	// journalled transactions in small-ish batches.
+	loadBatch := func(txs types.Transactions) {
+		for _, err := range add(txs) {
 			if err != nil {
 				log.Debug("Failed to add journaled transaction", "err", err)
 				dropped++
 			}
 		}
 	}
-
 	var (
 		failure error
-		txs     types.Transactions
+		batch   types.Transactions
 	)
-
 	for {
 		// Parse the next transaction and terminate on error
 		tx := new(types.Transaction)
@@ -99,19 +98,19 @@ func (journal *txJournal) load(add func([]*types.Transaction) []error) error {
 			if err != io.EOF {
 				failure = err
 			}
+			if batch.Len() > 0 {
+				loadBatch(batch)
+			}
 			break
 		}
-		txs = append(txs, tx)
+		// New transaction parsed, queue up for later, import if threnshold is reached
 		total++
-		if txs.Len() > 1024 {
-			flush(txs)
-			txs = types.Transactions{}
+
+		if batch = append(batch, tx); batch.Len() > 1024 {
+			loadBatch(batch)
+			batch = batch[:0]
 		}
 	}
-	if txs.Len() > 0 {
-		flush(txs)
-		txs = types.Transactions{}
-	}
 	log.Info("Loaded local transaction journal", "transactions", total, "dropped", dropped)
 
 	return failure
diff --git a/core/tx_pool.go b/core/tx_pool.go
index f23828cb4..f89e11441 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -444,9 +444,9 @@ func (pool *TxPool) Stop() {
 	log.Info("Transaction pool stopped")
 }
 
-// SubscribeTxPreEvent registers a subscription of TxsPreEvent and
+// SubscribeNewTxsEvent registers a subscription of NewTxsEvent and
 // starts sending event to the given channel.
-func (pool *TxPool) SubscribeTxPreEvent(ch chan<- TxsPreEvent) event.Subscription {
+func (pool *TxPool) SubscribeNewTxsEvent(ch chan<- NewTxsEvent) event.Subscription {
 	return pool.scope.Track(pool.txFeed.Subscribe(ch))
 }
 
@@ -653,7 +653,7 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (bool, error) {
 		log.Trace("Pooled new executable transaction", "hash", hash, "from", from, "to", tx.To())
 
 		// We've directly injected a replacement transaction, notify subsystems
-		go pool.txFeed.Send(TxsPreEvent{types.Transactions{tx}})
+		go pool.txFeed.Send(NewTxsEvent{types.Transactions{tx}})
 
 		return old != nil, nil
 	}
@@ -712,7 +712,8 @@ func (pool *TxPool) journalTx(from common.Address, tx *types.Transaction) {
 	}
 }
 
-// promoteTx adds a transaction to the pending (processable) list of transactions.
+// promoteTx adds a transaction to the pending (processable) list of transactions
+// and returns whether it was inserted or an older was better.
 //
 // Note, this method assumes the pool lock is held!
 func (pool *TxPool) promoteTx(addr common.Address, hash common.Hash, tx *types.Transaction) bool {
@@ -746,6 +747,7 @@ func (pool *TxPool) promoteTx(addr common.Address, hash common.Hash, tx *types.T
 	// Set the potentially new pending nonce and notify any subsystems of the new tx
 	pool.beats[addr] = time.Now()
 	pool.pendingState.SetNonce(addr, tx.Nonce()+1)
+
 	return true
 }
 
@@ -906,7 +908,9 @@ func (pool *TxPool) removeTx(hash common.Hash, outofbound bool) {
 // future queue to the set of pending transactions. During this process, all
 // invalidated transactions (low nonce, low balance) are deleted.
 func (pool *TxPool) promoteExecutables(accounts []common.Address) {
-	var promotedTxs types.Transactions
+	// Track the promoted transactions to broadcast them at once
+	var promoted []*types.Transaction
+
 	// Gather all the accounts potentially needing updates
 	if accounts == nil {
 		accounts = make([]common.Address, 0, len(pool.queue))
@@ -937,16 +941,13 @@ func (pool *TxPool) promoteExecutables(accounts []common.Address) {
 			queuedNofundsCounter.Inc(1)
 		}
 		// Gather all executable transactions and promote them
-		txs := list.Ready(pool.pendingState.GetNonce(addr))
-		for _, tx := range txs {
+		for _, tx := range list.Ready(pool.pendingState.GetNonce(addr)) {
 			hash := tx.Hash()
-			inserted := pool.promoteTx(addr, hash, tx)
-			if inserted {
+			if pool.promoteTx(addr, hash, tx) {
 				log.Trace("Promoting queued transaction", "hash", hash)
-				promotedTxs = append(promotedTxs, tx)
+				promoted = append(promoted, tx)
 			}
 		}
-
 		// Drop all transactions over the allowed limit
 		if !pool.locals.contains(addr) {
 			for _, tx := range list.Cap(int(pool.config.AccountQueue)) {
@@ -963,10 +964,9 @@ func (pool *TxPool) promoteExecutables(accounts []common.Address) {
 		}
 	}
 	// Notify subsystem for new promoted transactions.
-	if promotedTxs.Len() > 0 {
-		pool.txFeed.Send(TxsPreEvent{promotedTxs})
+	if len(promoted) > 0 {
+		pool.txFeed.Send(NewTxsEvent{promoted})
 	}
-
 	// If the pending limit is overflown, start equalizing allowances
 	pending := uint64(0)
 	for _, list := range pool.pending {
diff --git a/core/tx_pool_test.go b/core/tx_pool_test.go
index c19581e3f..25993c258 100644
--- a/core/tx_pool_test.go
+++ b/core/tx_pool_test.go
@@ -118,19 +118,20 @@ func validateTxPoolInternals(pool *TxPool) error {
 
 // validateEvents checks that the correct number of transaction addition events
 // were fired on the pool's event feed.
-func validateEvents(events chan TxsPreEvent, count int) error {
-	received := 0
-	for {
-		if received == count {
-			break
-		}
+func validateEvents(events chan NewTxsEvent, count int) error {
+	var received []*types.Transaction
+
+	for len(received) < count {
 		select {
 		case ev := <-events:
-			received += ev.Txs.Len()
+			received = append(received, ev.Txs...)
 		case <-time.After(time.Second):
 			return fmt.Errorf("event #%d not fired", received)
 		}
 	}
+	if len(received) > count {
+		return fmt.Errorf("more than %d events fired: %v", count, received[count:])
+	}
 	select {
 	case ev := <-events:
 		return fmt.Errorf("more than %d events fired: %v", count, ev.Txs)
@@ -674,7 +675,7 @@ func TestTransactionGapFilling(t *testing.T) {
 	pool.currentState.AddBalance(account, big.NewInt(1000000))
 
 	// Keep track of transaction events to ensure all executables get announced
-	events := make(chan TxsPreEvent, testTxPoolConfig.AccountQueue+5)
+	events := make(chan NewTxsEvent, testTxPoolConfig.AccountQueue+5)
 	sub := pool.txFeed.Subscribe(events)
 	defer sub.Unsubscribe()
 
@@ -925,7 +926,7 @@ func TestTransactionPendingLimiting(t *testing.T) {
 	pool.currentState.AddBalance(account, big.NewInt(1000000))
 
 	// Keep track of transaction events to ensure all executables get announced
-	events := make(chan TxsPreEvent, testTxPoolConfig.AccountQueue+5)
+	events := make(chan NewTxsEvent, testTxPoolConfig.AccountQueue+5)
 	sub := pool.txFeed.Subscribe(events)
 	defer sub.Unsubscribe()
 
@@ -1145,7 +1146,7 @@ func TestTransactionPoolRepricing(t *testing.T) {
 	defer pool.Stop()
 
 	// Keep track of transaction events to ensure all executables get announced
-	events := make(chan TxsPreEvent, 32)
+	events := make(chan NewTxsEvent, 32)
 	sub := pool.txFeed.Subscribe(events)
 	defer sub.Unsubscribe()
 
@@ -1332,7 +1333,7 @@ func TestTransactionPoolUnderpricing(t *testing.T) {
 	defer pool.Stop()
 
 	// Keep track of transaction events to ensure all executables get announced
-	events := make(chan TxsPreEvent, 32)
+	events := make(chan NewTxsEvent, 32)
 	sub := pool.txFeed.Subscribe(events)
 	defer sub.Unsubscribe()
 
@@ -1438,7 +1439,7 @@ func TestTransactionPoolStableUnderpricing(t *testing.T) {
 	defer pool.Stop()
 
 	// Keep track of transaction events to ensure all executables get announced
-	events := make(chan TxsPreEvent, 32)
+	events := make(chan NewTxsEvent, 32)
 	sub := pool.txFeed.Subscribe(events)
 	defer sub.Unsubscribe()
 
@@ -1500,7 +1501,7 @@ func TestTransactionReplacement(t *testing.T) {
 	defer pool.Stop()
 
 	// Keep track of transaction events to ensure all executables get announced
-	events := make(chan TxsPreEvent, 32)
+	events := make(chan NewTxsEvent, 32)
 	sub := pool.txFeed.Subscribe(events)
 	defer sub.Unsubscribe()
 
diff --git a/eth/api_backend.go b/eth/api_backend.go
index ef70b12b7..91a7dc7e0 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -188,8 +188,8 @@ func (b *EthAPIBackend) TxPoolContent() (map[common.Address]types.Transactions,
 	return b.eth.TxPool().Content()
 }
 
-func (b *EthAPIBackend) SubscribeTxPreEvent(ch chan<- core.TxsPreEvent) event.Subscription {
-	return b.eth.TxPool().SubscribeTxPreEvent(ch)
+func (b *EthAPIBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
+	return b.eth.TxPool().SubscribeNewTxsEvent(ch)
 }
 
 func (b *EthAPIBackend) Downloader() *downloader.Downloader {
diff --git a/eth/filters/api.go b/eth/filters/api.go
index d2c9258f9..592ad3b82 100644
--- a/eth/filters/api.go
+++ b/eth/filters/api.go
@@ -105,7 +105,7 @@ func (api *PublicFilterAPI) timeoutLoop() {
 func (api *PublicFilterAPI) NewPendingTransactionFilter() rpc.ID {
 	var (
 		pendingTxs   = make(chan []common.Hash)
-		pendingTxSub = api.events.SubscribePendingTxEvents(pendingTxs)
+		pendingTxSub = api.events.SubscribePendingTxs(pendingTxs)
 	)
 
 	api.filtersMu.Lock()
@@ -145,7 +145,7 @@ func (api *PublicFilterAPI) NewPendingTransactions(ctx context.Context) (*rpc.Su
 
 	go func() {
 		txHashes := make(chan []common.Hash, 128)
-		pendingTxSub := api.events.SubscribePendingTxEvents(txHashes)
+		pendingTxSub := api.events.SubscribePendingTxs(txHashes)
 
 		for {
 			select {
diff --git a/eth/filters/filter.go b/eth/filters/filter.go
index 45d91bea0..67b4612ae 100644
--- a/eth/filters/filter.go
+++ b/eth/filters/filter.go
@@ -36,7 +36,7 @@ type Backend interface {
 	GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error)
 	GetLogs(ctx context.Context, blockHash common.Hash) ([][]*types.Log, error)
 
-	SubscribeTxPreEvent(chan<- core.TxsPreEvent) event.Subscription
+	SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
 	SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription
 	SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription
 	SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription
diff --git a/eth/filters/filter_system.go b/eth/filters/filter_system.go
index 5f1c12c6a..4e999cda8 100644
--- a/eth/filters/filter_system.go
+++ b/eth/filters/filter_system.go
@@ -59,7 +59,7 @@ const (
 
 const (
 
-	// txChanSize is the size of channel listening to TxsPreEvent.
+	// txChanSize is the size of channel listening to NewTxsEvent.
 	// The number is referenced from the size of tx pool.
 	txChanSize = 4096
 	// rmLogsChanSize is the size of channel listening to RemovedLogsEvent.
@@ -104,7 +104,7 @@ type EventSystem struct {
 	// Channels
 	install   chan *subscription         // install filter for event notification
 	uninstall chan *subscription         // remove filter for event notification
-	txsCh     chan core.TxsPreEvent      // Channel to receive new transactions event
+	txsCh     chan core.NewTxsEvent      // Channel to receive new transactions event
 	logsCh    chan []*types.Log          // Channel to receive new log event
 	rmLogsCh  chan core.RemovedLogsEvent // Channel to receive removed log event
 	chainCh   chan core.ChainEvent       // Channel to receive new chain event
@@ -123,14 +123,14 @@ func NewEventSystem(mux *event.TypeMux, backend Backend, lightMode bool) *EventS
 		lightMode: lightMode,
 		install:   make(chan *subscription),
 		uninstall: make(chan *subscription),
-		txsCh:     make(chan core.TxsPreEvent, txChanSize),
+		txsCh:     make(chan core.NewTxsEvent, txChanSize),
 		logsCh:    make(chan []*types.Log, logsChanSize),
 		rmLogsCh:  make(chan core.RemovedLogsEvent, rmLogsChanSize),
 		chainCh:   make(chan core.ChainEvent, chainEvChanSize),
 	}
 
 	// Subscribe events
-	m.txsSub = m.backend.SubscribeTxPreEvent(m.txsCh)
+	m.txsSub = m.backend.SubscribeNewTxsEvent(m.txsCh)
 	m.logsSub = m.backend.SubscribeLogsEvent(m.logsCh)
 	m.rmLogsSub = m.backend.SubscribeRemovedLogsEvent(m.rmLogsCh)
 	m.chainSub = m.backend.SubscribeChainEvent(m.chainCh)
@@ -298,9 +298,9 @@ func (es *EventSystem) SubscribeNewHeads(headers chan *types.Header) *Subscripti
 	return es.subscribe(sub)
 }
 
-// SubscribePendingTxEvents creates a subscription that writes transaction hashes for
+// SubscribePendingTxs creates a subscription that writes transaction hashes for
 // transactions that enter the transaction pool.
-func (es *EventSystem) SubscribePendingTxEvents(hashes chan []common.Hash) *Subscription {
+func (es *EventSystem) SubscribePendingTxs(hashes chan []common.Hash) *Subscription {
 	sub := &subscription{
 		id:        rpc.NewID(),
 		typ:       PendingTransactionsSubscription,
@@ -348,8 +348,8 @@ func (es *EventSystem) broadcast(filters filterIndex, ev interface{}) {
 				}
 			}
 		}
-	case core.TxsPreEvent:
-		hashes := make([]common.Hash, 0, e.Txs.Len())
+	case core.NewTxsEvent:
+		hashes := make([]common.Hash, 0, len(e.Txs))
 		for _, tx := range e.Txs {
 			hashes = append(hashes, tx.Hash())
 		}
diff --git a/eth/filters/filter_system_test.go b/eth/filters/filter_system_test.go
index c43d282ae..ff1af85a8 100644
--- a/eth/filters/filter_system_test.go
+++ b/eth/filters/filter_system_test.go
@@ -96,7 +96,7 @@ func (b *testBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types
 	return logs, nil
 }
 
-func (b *testBackend) SubscribeTxPreEvent(ch chan<- core.TxsPreEvent) event.Subscription {
+func (b *testBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
 	return b.txFeed.Subscribe(ch)
 }
 
@@ -232,7 +232,7 @@ func TestPendingTxFilter(t *testing.T) {
 	fid0 := api.NewPendingTransactionFilter()
 
 	time.Sleep(1 * time.Second)
-	txFeed.Send(core.TxsPreEvent{transactions})
+	txFeed.Send(core.NewTxsEvent{Txs: transactions})
 
 	timeout := time.Now().Add(1 * time.Second)
 	for {
diff --git a/eth/handler.go b/eth/handler.go
index 7ef8e957a..8993afe15 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -46,7 +46,7 @@ const (
 	softResponseLimit = 2 * 1024 * 1024 // Target maximum size of returned blocks, headers or node data.
 	estHeaderRlpSize  = 500             // Approximate size of an RLP encoded block header
 
-	// txChanSize is the size of channel listening to TxsPreEvent.
+	// txChanSize is the size of channel listening to NewTxsEvent.
 	// The number is referenced from the size of tx pool.
 	txChanSize = 4096
 )
@@ -81,7 +81,7 @@ type ProtocolManager struct {
 	SubProtocols []p2p.Protocol
 
 	eventMux      *event.TypeMux
-	txsCh         chan core.TxsPreEvent
+	txsCh         chan core.NewTxsEvent
 	txsSub        event.Subscription
 	minedBlockSub *event.TypeMuxSubscription
 
@@ -204,8 +204,8 @@ func (pm *ProtocolManager) Start(maxPeers int) {
 	pm.maxPeers = maxPeers
 
 	// broadcast transactions
-	pm.txsCh = make(chan core.TxsPreEvent, txChanSize)
-	pm.txsSub = pm.txpool.SubscribeTxPreEvent(pm.txsCh)
+	pm.txsCh = make(chan core.NewTxsEvent, txChanSize)
+	pm.txsSub = pm.txpool.SubscribeNewTxsEvent(pm.txsCh)
 	go pm.txBroadcastLoop()
 
 	// broadcast mined blocks
diff --git a/eth/helper_test.go b/eth/helper_test.go
index 40a172ef8..3d2ab0aba 100644
--- a/eth/helper_test.go
+++ b/eth/helper_test.go
@@ -124,7 +124,7 @@ func (p *testTxPool) Pending() (map[common.Address]types.Transactions, error) {
 	return batches, nil
 }
 
-func (p *testTxPool) SubscribeTxPreEvent(ch chan<- core.TxsPreEvent) event.Subscription {
+func (p *testTxPool) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
 	return p.txFeed.Subscribe(ch)
 }
 
diff --git a/eth/protocol.go b/eth/protocol.go
index bee3d8365..0e90e6a2e 100644
--- a/eth/protocol.go
+++ b/eth/protocol.go
@@ -103,9 +103,9 @@ type txPool interface {
 	// The slice should be modifiable by the caller.
 	Pending() (map[common.Address]types.Transactions, error)
 
-	// SubscribeTxPreEvent should return an event subscription of
-	// TxsPreEvent and send events to the given channel.
-	SubscribeTxPreEvent(chan<- core.TxsPreEvent) event.Subscription
+	// SubscribeNewTxsEvent should return an event subscription of
+	// NewTxsEvent and send events to the given channel.
+	SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
 }
 
 // statusData is the network packet for the status message.
diff --git a/eth/protocol_test.go b/eth/protocol_test.go
index 1c32ea7d8..aa43dfa92 100644
--- a/eth/protocol_test.go
+++ b/eth/protocol_test.go
@@ -116,7 +116,7 @@ func testRecvTransactions(t *testing.T, protocol int) {
 			t.Errorf("added wrong tx hash: got %v, want %v", added[0].Hash(), tx.Hash())
 		}
 	case <-time.After(2 * time.Second):
-		t.Errorf("no TxsPreEvent received within 2 seconds")
+		t.Errorf("no NewTxsEvent received within 2 seconds")
 	}
 }
 
diff --git a/ethstats/ethstats.go b/ethstats/ethstats.go
index 17f9f3c7a..c11601435 100644
--- a/ethstats/ethstats.go
+++ b/ethstats/ethstats.go
@@ -49,7 +49,7 @@ const (
 	// history request.
 	historyUpdateRange = 50
 
-	// txChanSize is the size of channel listening to TxsPreEvent.
+	// txChanSize is the size of channel listening to NewTxsEvent.
 	// The number is referenced from the size of tx pool.
 	txChanSize = 4096
 	// chainHeadChanSize is the size of channel listening to ChainHeadEvent.
@@ -57,9 +57,9 @@ const (
 )
 
 type txPool interface {
-	// SubscribeTxPreEvent should return an event subscription of
-	// TxsPreEvent and send events to the given channel.
-	SubscribeTxPreEvent(chan<- core.TxsPreEvent) event.Subscription
+	// SubscribeNewTxsEvent should return an event subscription of
+	// NewTxsEvent and send events to the given channel.
+	SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
 }
 
 type blockChain interface {
@@ -150,8 +150,8 @@ func (s *Service) loop() {
 	headSub := blockchain.SubscribeChainHeadEvent(chainHeadCh)
 	defer headSub.Unsubscribe()
 
-	txEventCh := make(chan core.TxsPreEvent, txChanSize)
-	txSub := txpool.SubscribeTxPreEvent(txEventCh)
+	txEventCh := make(chan core.NewTxsEvent, txChanSize)
+	txSub := txpool.SubscribeNewTxsEvent(txEventCh)
 	defer txSub.Unsubscribe()
 
 	// Start a goroutine that exhausts the subsciptions to avoid events piling up
diff --git a/internal/ethapi/backend.go b/internal/ethapi/backend.go
index e351152b9..c9ffe230c 100644
--- a/internal/ethapi/backend.go
+++ b/internal/ethapi/backend.go
@@ -65,7 +65,7 @@ type Backend interface {
 	GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error)
 	Stats() (pending int, queued int)
 	TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions)
-	SubscribeTxPreEvent(chan<- core.TxsPreEvent) event.Subscription
+	SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
 
 	ChainConfig() *params.ChainConfig
 	CurrentBlock() *types.Block
diff --git a/les/api_backend.go b/les/api_backend.go
index 957c8ae64..dea33c470 100644
--- a/les/api_backend.go
+++ b/les/api_backend.go
@@ -136,8 +136,8 @@ func (b *LesApiBackend) TxPoolContent() (map[common.Address]types.Transactions,
 	return b.eth.txPool.Content()
 }
 
-func (b *LesApiBackend) SubscribeTxPreEvent(ch chan<- core.TxsPreEvent) event.Subscription {
-	return b.eth.txPool.SubscribeTxPreEvent(ch)
+func (b *LesApiBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
+	return b.eth.txPool.SubscribeNewTxsEvent(ch)
 }
 
 func (b *LesApiBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
diff --git a/light/txpool.go b/light/txpool.go
index bedfd48a2..1fabc3dc5 100644
--- a/light/txpool.go
+++ b/light/txpool.go
@@ -321,9 +321,9 @@ func (pool *TxPool) Stop() {
 	log.Info("Transaction pool stopped")
 }
 
-// SubscribeTxPreEvent registers a subscription of core.TxsPreEvent and
+// SubscribeNewTxsEvent registers a subscription of core.NewTxsEvent and
 // starts sending event to the given channel.
-func (pool *TxPool) SubscribeTxPreEvent(ch chan<- core.TxsPreEvent) event.Subscription {
+func (pool *TxPool) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
 	return pool.scope.Track(pool.txFeed.Subscribe(ch))
 }
 
@@ -412,7 +412,7 @@ func (self *TxPool) add(ctx context.Context, tx *types.Transaction) error {
 		// Notify the subscribers. This event is posted in a goroutine
 		// because it's possible that somewhere during the post "Remove transaction"
 		// gets called which will then wait for the global tx pool lock and deadlock.
-		go self.txFeed.Send(core.TxsPreEvent{types.Transactions{tx}})
+		go self.txFeed.Send(core.NewTxsEvent{Txs: types.Transactions{tx}})
 	}
 
 	// Print a log message if low enough level is set
diff --git a/miner/worker.go b/miner/worker.go
index 3d086d6ae..640e9032e 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -42,7 +42,7 @@ const (
 	resultQueueSize  = 10
 	miningLogAtDepth = 5
 
-	// txChanSize is the size of channel listening to TxsPreEvent.
+	// txChanSize is the size of channel listening to NewTxsEvent.
 	// The number is referenced from the size of tx pool.
 	txChanSize = 4096
 	// chainHeadChanSize is the size of channel listening to ChainHeadEvent.
@@ -71,7 +71,7 @@ type Work struct {
 	family    *set.Set       // family set (used for checking uncle invalidity)
 	uncles    *set.Set       // uncle set
 	tcount    int            // tx count in cycle
-	gasPool   *core.GasPool  // available gas used to pack transaction.
+	gasPool   *core.GasPool  // available gas used to pack transactions
 
 	Block *types.Block // the new block
 
@@ -96,7 +96,7 @@ type worker struct {
 
 	// update loop
 	mux          *event.TypeMux
-	txsCh        chan core.TxsPreEvent
+	txsCh        chan core.NewTxsEvent
 	txsSub       event.Subscription
 	chainHeadCh  chan core.ChainHeadEvent
 	chainHeadSub event.Subscription
@@ -138,7 +138,7 @@ func newWorker(config *params.ChainConfig, engine consensus.Engine, coinbase com
 		engine:         engine,
 		eth:            eth,
 		mux:            mux,
-		txsCh:          make(chan core.TxsPreEvent, txChanSize),
+		txsCh:          make(chan core.NewTxsEvent, txChanSize),
 		chainHeadCh:    make(chan core.ChainHeadEvent, chainHeadChanSize),
 		chainSideCh:    make(chan core.ChainSideEvent, chainSideChanSize),
 		chainDb:        eth.ChainDb(),
@@ -150,8 +150,8 @@ func newWorker(config *params.ChainConfig, engine consensus.Engine, coinbase com
 		agents:         make(map[Agent]struct{}),
 		unconfirmed:    newUnconfirmedBlocks(eth.BlockChain(), miningLogAtDepth),
 	}
-	// Subscribe TxsPreEvent for tx pool
-	worker.txsSub = eth.TxPool().SubscribeTxPreEvent(worker.txsCh)
+	// Subscribe NewTxsEvent for tx pool
+	worker.txsSub = eth.TxPool().SubscribeNewTxsEvent(worker.txsCh)
 	// Subscribe events for blockchain
 	worker.chainHeadSub = eth.BlockChain().SubscribeChainHeadEvent(worker.chainHeadCh)
 	worker.chainSideSub = eth.BlockChain().SubscribeChainSideEvent(worker.chainSideCh)
@@ -259,7 +259,7 @@ func (self *worker) update() {
 			self.possibleUncles[ev.Block.Hash()] = ev.Block
 			self.uncleMu.Unlock()
 
-		// Handle TxsPreEvent
+		// Handle NewTxsEvent
 		case ev := <-self.txsCh:
 			// Apply transactions to the pending state if we're not mining.
 			//
@@ -538,7 +538,7 @@ func (env *Work) commitTransactions(mux *event.TypeMux, txs *types.TransactionsB
 	for {
 		// If we don't have enough gas for any further transactions then we're done
 		if env.gasPool.Gas() < params.TxGas {
-			log.Trace("Not enough gas for further transactions", "gp", env.gasPool)
+			log.Trace("Not enough gas for further transactions", "have", env.gasPool, "want", params.TxGas)
 			break
 		}
 		// Retrieve the next transaction and abort if all done