core: tx_pool: remove transactions on BlockConfirmed event

5 files changed, 55 insertions, 42 deletions

diff --git a/core/blockchain.go b/core/blockchain.go
index 7eb6f3606..1bbaf2bc9 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -104,14 +104,15 @@ type BlockChain struct {
 	triegc *prque.Prque   // Priority queue mapping block numbers to tries to gc
 	gcproc time.Duration  // Accumulates canonical block processing for trie dumping
 
-	hc            *HeaderChain
-	rmLogsFeed    event.Feed
-	chainFeed     event.Feed
-	chainSideFeed event.Feed
-	chainHeadFeed event.Feed
-	logsFeed      event.Feed
-	scope         event.SubscriptionScope
-	genesisBlock  *types.Block
+	hc                 *HeaderChain
+	rmLogsFeed         event.Feed
+	chainFeed          event.Feed
+	chainSideFeed      event.Feed
+	chainHeadFeed      event.Feed
+	blockConfirmedFeed event.Feed
+	logsFeed           event.Feed
+	scope              event.SubscriptionScope
+	genesisBlock       *types.Block
 
 	mu      sync.RWMutex // global mutex for locking chain operations
 	chainmu sync.RWMutex // blockchain insertion lock
@@ -1604,6 +1605,7 @@ func (bc *BlockChain) processPendingBlock(block *types.Block, witness *coreTypes
 
 	// add into pending blocks
 	bc.addPendingBlock(newPendingBlock, receipts)
+	events = append(events, BlockConfirmedEvent{newPendingBlock})
 
 	// start insert available pending blocks into db
 	for pendingHeight := bc.CurrentBlock().NumberU64() + 1; pendingHeight <= witness.Height; pendingHeight++ {
@@ -1824,6 +1826,9 @@ func (bc *BlockChain) PostChainEvents(events []interface{}, logs []*types.Log) {
 		case ChainHeadEvent:
 			bc.chainHeadFeed.Send(ev)
 
+		case BlockConfirmedEvent:
+			bc.blockConfirmedFeed.Send(ev)
+
 		case ChainSideEvent:
 			bc.chainSideFeed.Send(ev)
 		}
@@ -2016,6 +2021,11 @@ func (bc *BlockChain) SubscribeChainHeadEvent(ch chan<- ChainHeadEvent) event.Su
 	return bc.scope.Track(bc.chainHeadFeed.Subscribe(ch))
 }
 
+// SubscribeBlockConfirmedEvent registers a subscription of ChainHeadEvent.
+func (bc *BlockChain) SubscribeBlockConfirmedEvent(ch chan<- BlockConfirmedEvent) event.Subscription {
+	return bc.scope.Track(bc.blockConfirmedFeed.Subscribe(ch))
+}
+
 // SubscribeChainSideEvent registers a subscription of ChainSideEvent.
 func (bc *BlockChain) SubscribeChainSideEvent(ch chan<- ChainSideEvent) event.Subscription {
 	return bc.scope.Track(bc.chainSideFeed.Subscribe(ch))
diff --git a/core/events.go b/core/events.go
index e76aa4784..1231daa37 100644
--- a/core/events.go
+++ b/core/events.go
@@ -47,6 +47,8 @@ type ChainSideEvent struct {
 
 type ChainHeadEvent struct{ Block *types.Block }
 
+type BlockConfirmedEvent struct{ Block *types.Block }
+
 type NewNotarySetEvent struct {
 	Round   uint64
 	Pubkeys map[string]struct{} // pubkeys in hex format
diff --git a/core/tx_pool.go b/core/tx_pool.go
index db9a6b9f9..6a9fa45c3 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -36,8 +36,8 @@ import (
 )
 
 const (
-	// chainHeadChanSize is the size of channel listening to ChainHeadEvent.
-	chainHeadChanSize = 10
+	// blockConfirmedChanSize is the size of channel listening to BlockConfirmedEvent.
+	blockConfirmedChanSize = 10
 )
 
 var (
@@ -118,7 +118,7 @@ type blockChain interface {
 	GetBlock(hash common.Hash, number uint64) *types.Block
 	StateAt(root common.Hash) (*state.StateDB, error)
 
-	SubscribeChainHeadEvent(ch chan<- ChainHeadEvent) event.Subscription
+	SubscribeBlockConfirmedEvent(ch chan<- BlockConfirmedEvent) event.Subscription
 }
 
 // TxPoolConfig are the configuration parameters of the transaction pool.
@@ -183,16 +183,16 @@ func (config *TxPoolConfig) sanitize() TxPoolConfig {
 // current state) and future transactions. Transactions move between those
 // two states over time as they are received and processed.
 type TxPool struct {
-	config       TxPoolConfig
-	chainconfig  *params.ChainConfig
-	chain        blockChain
-	gasPrice     *big.Int
-	txFeed       event.Feed
-	scope        event.SubscriptionScope
-	chainHeadCh  chan ChainHeadEvent
-	chainHeadSub event.Subscription
-	signer       types.Signer
-	mu           sync.RWMutex
+	config            TxPoolConfig
+	chainconfig       *params.ChainConfig
+	chain             blockChain
+	gasPrice          *big.Int
+	txFeed            event.Feed
+	scope             event.SubscriptionScope
+	blockConfirmedCh  chan BlockConfirmedEvent
+	blockConfirmedSub event.Subscription
+	signer            types.Signer
+	mu                sync.RWMutex
 
 	currentState  *state.StateDB      // Current state in the blockchain head
 	pendingState  *state.ManagedState // Pending state tracking virtual nonces
@@ -220,16 +220,16 @@ func NewTxPool(config TxPoolConfig, chainconfig *params.ChainConfig, chain block
 
 	// Create the transaction pool with its initial settings
 	pool := &TxPool{
-		config:      config,
-		chainconfig: chainconfig,
-		chain:       chain,
-		signer:      types.NewEIP155Signer(chainconfig.ChainID),
-		pending:     make(map[common.Address]*txList),
-		queue:       make(map[common.Address]*txList),
-		beats:       make(map[common.Address]time.Time),
-		all:         newTxLookup(),
-		chainHeadCh: make(chan ChainHeadEvent, chainHeadChanSize),
-		gasPrice:    new(big.Int).SetUint64(config.PriceLimit),
+		config:           config,
+		chainconfig:      chainconfig,
+		chain:            chain,
+		signer:           types.NewEIP155Signer(chainconfig.ChainID),
+		pending:          make(map[common.Address]*txList),
+		queue:            make(map[common.Address]*txList),
+		beats:            make(map[common.Address]time.Time),
+		all:              newTxLookup(),
+		blockConfirmedCh: make(chan BlockConfirmedEvent, blockConfirmedChanSize),
+		gasPrice:         new(big.Int).SetUint64(config.PriceLimit),
 	}
 	pool.locals = newAccountSet(pool.signer)
 	for _, addr := range config.Locals {
@@ -251,7 +251,7 @@ func NewTxPool(config TxPoolConfig, chainconfig *params.ChainConfig, chain block
 		}
 	}
 	// Subscribe events from blockchain
-	pool.chainHeadSub = pool.chain.SubscribeChainHeadEvent(pool.chainHeadCh)
+	pool.blockConfirmedSub = pool.chain.SubscribeBlockConfirmedEvent(pool.blockConfirmedCh)
 
 	// Start the event loop and return
 	pool.wg.Add(1)
@@ -284,8 +284,8 @@ func (pool *TxPool) loop() {
 	// Keep waiting for and reacting to the various events
 	for {
 		select {
-		// Handle ChainHeadEvent
-		case ev := <-pool.chainHeadCh:
+		// Handle BlockConfirmedEvent
+		case ev := <-pool.blockConfirmedCh:
 			if ev.Block != nil {
 				pool.mu.Lock()
 				if pool.chainconfig.IsHomestead(ev.Block.Number()) {
@@ -297,7 +297,7 @@ func (pool *TxPool) loop() {
 				pool.mu.Unlock()
 			}
 			// Be unsubscribed due to system stopped
-		case <-pool.chainHeadSub.Err():
+		case <-pool.blockConfirmedSub.Err():
 			return
 
 			// Handle stats reporting ticks
@@ -441,7 +441,7 @@ func (pool *TxPool) Stop() {
 	pool.scope.Close()
 
 	// Unsubscribe subscriptions registered from blockchain
-	pool.chainHeadSub.Unsubscribe()
+	pool.blockConfirmedSub.Unsubscribe()
 	pool.wg.Wait()
 
 	if pool.journal != nil {
diff --git a/core/tx_pool_test.go b/core/tx_pool_test.go
index d63125ac9..3f0ab9df3 100644
--- a/core/tx_pool_test.go
+++ b/core/tx_pool_test.go
@@ -45,9 +45,9 @@ func init() {
 }
 
 type testBlockChain struct {
-	statedb       *state.StateDB
-	gasLimit      uint64
-	chainHeadFeed *event.Feed
+	statedb            *state.StateDB
+	gasLimit           uint64
+	blockConfirmedFeed *event.Feed
 }
 
 func (bc *testBlockChain) CurrentBlock() *types.Block {
@@ -64,8 +64,8 @@ func (bc *testBlockChain) StateAt(common.Hash) (*state.StateDB, error) {
 	return bc.statedb, nil
 }
 
-func (bc *testBlockChain) SubscribeChainHeadEvent(ch chan<- ChainHeadEvent) event.Subscription {
-	return bc.chainHeadFeed.Subscribe(ch)
+func (bc *testBlockChain) SubscribeBlockConfirmedEvent(ch chan<- BlockConfirmedEvent) event.Subscription {
+	return bc.blockConfirmedFeed.Subscribe(ch)
 }
 
 func transaction(nonce uint64, gaslimit uint64, key *ecdsa.PrivateKey) *types.Transaction {
diff --git a/dex/app.go b/dex/app.go
index b325f44d0..3bc5053a4 100644
--- a/dex/app.go
+++ b/dex/app.go
@@ -67,7 +67,8 @@ type witnessData struct {
 	ReceiptHash common.Hash
 }
 
-func NewDexconApp(txPool *core.TxPool, blockchain *core.BlockChain, gov *DexconGovernance, chainDB ethdb.Database, config *Config, vmConfig vm.Config) *DexconApp {
+func NewDexconApp(txPool *core.TxPool, blockchain *core.BlockChain, gov *DexconGovernance,
+	chainDB ethdb.Database, config *Config, vmConfig vm.Config) *DexconApp {
 	return &DexconApp{
 		txPool:          txPool,
 		blockchain:      blockchain,