mirror of https://github.com/BTCPrivate/lnd.git
chainntnfs/neutrino: Handle block connects and disconnects in order.
This commit is contained in:
Jim Posen
Olaoluwa Osuntokun
parent
0cac7e80d4
commit
fa513a76ad
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@ -65,8 +65,7 @@ type NeutrinoNotifier struct {
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rescanErr <-chan error
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newBlocks *chainntnfs.ConcurrentQueue
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staleBlocks *chainntnfs.ConcurrentQueue
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chainUpdates *chainntnfs.ConcurrentQueue
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wg sync.WaitGroup
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quit chan struct{}
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@ -96,9 +95,7 @@ func New(node *neutrino.ChainService) (*NeutrinoNotifier, error) {
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rescanErr: make(chan error),
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newBlocks: chainntnfs.NewConcurrentQueue(10),
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staleBlocks: chainntnfs.NewConcurrentQueue(10),
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chainUpdates: chainntnfs.NewConcurrentQueue(10),
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quit: make(chan struct{}),
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}
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@ -150,8 +147,7 @@ func (n *NeutrinoNotifier) Start() error {
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n.chainView = n.p2pNode.NewRescan(rescanOptions...)
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n.rescanErr = n.chainView.Start()
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n.newBlocks.Start()
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n.staleBlocks.Start()
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n.chainUpdates.Start()
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n.wg.Add(1)
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go n.notificationDispatcher()
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@ -169,8 +165,7 @@ func (n *NeutrinoNotifier) Stop() error {
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close(n.quit)
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n.wg.Wait()
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n.newBlocks.Stop()
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n.staleBlocks.Stop()
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n.chainUpdates.Stop()
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// Notify all pending clients of our shutdown by closing the related
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// notification channels.
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@ -200,6 +195,10 @@ type filteredBlock struct {
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hash chainhash.Hash
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height uint32
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txns []*btcutil.Tx
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// connected is true if this update is a new block and false if it is a
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// disconnected block.
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connect bool
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}
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// onFilteredBlockConnected is a callback which is executed each a new block is
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@ -209,10 +208,11 @@ func (n *NeutrinoNotifier) onFilteredBlockConnected(height int32,
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// Append this new chain update to the end of the queue of new chain
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// updates.
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n.newBlocks.ChanIn() <- &filteredBlock{
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hash: header.BlockHash(),
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height: uint32(height),
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txns: txns,
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n.chainUpdates.ChanIn() <- &filteredBlock{
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hash: header.BlockHash(),
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height: uint32(height),
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txns: txns,
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connect: true,
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}
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}
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@ -223,9 +223,10 @@ func (n *NeutrinoNotifier) onFilteredBlockDisconnected(height int32,
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// Append this new chain update to the end of the queue of new chain
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// disconnects.
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n.staleBlocks.ChanIn() <- &filteredBlock{
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hash: header.BlockHash(),
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height: uint32(height),
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n.chainUpdates.ChanIn() <- &filteredBlock{
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hash: header.BlockHash(),
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height: uint32(height),
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connect: false,
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}
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}
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@ -318,87 +319,40 @@ func (n *NeutrinoNotifier) notificationDispatcher() {
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n.blockEpochClients[msg.epochID] = msg
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}
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case item := <-n.newBlocks.ChanOut():
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newBlock := item.(*filteredBlock)
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n.heightMtx.Lock()
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n.bestHeight = newBlock.height
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n.heightMtx.Unlock()
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chainntnfs.Log.Infof("New block: height=%v, sha=%v",
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newBlock.height, newBlock.hash)
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// First we'll notify any subscribed clients of the
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// block.
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n.notifyBlockEpochs(int32(newBlock.height), &newBlock.hash)
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// Next, we'll scan over the list of relevant
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// transactions and possibly dispatch notifications for
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// confirmations and spends.
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for _, tx := range newBlock.txns {
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// Check if the inclusion of this transaction
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// within a block by itself triggers a block
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// confirmation threshold, if so send a
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// notification. Otherwise, place the
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// notification on a heap to be triggered in
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// the future once additional confirmations are
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// attained.
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mtx := tx.MsgTx()
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txIndex := tx.Index()
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txSha := mtx.TxHash()
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n.checkConfirmationTrigger(&txSha, newBlock, txIndex)
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for i, txIn := range mtx.TxIn {
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prevOut := txIn.PreviousOutPoint
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// If this transaction indeed does
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// spend an output which we have a
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// registered notification for, then
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// create a spend summary, finally
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// sending off the details to the
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// notification subscriber.
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if clients, ok := n.spendNotifications[prevOut]; ok {
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// TODO(roasbeef): many
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// integration tests expect
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// spend to be notified within
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// the mempool.
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spendDetails := &chainntnfs.SpendDetail{
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SpentOutPoint: &prevOut,
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SpenderTxHash: &txSha,
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SpendingTx: mtx,
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SpenderInputIndex: uint32(i),
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SpendingHeight: int32(newBlock.height),
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}
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for _, ntfn := range clients {
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chainntnfs.Log.Infof("Dispatching "+
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"spend notification for "+
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"outpoint=%v", ntfn.targetOutpoint)
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ntfn.spendChan <- spendDetails
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// Close spendChan to ensure that any calls to Cancel will not
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// block. This is safe to do since the channel is buffered, and the
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// message can still be read by the receiver.
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close(ntfn.spendChan)
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}
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delete(n.spendNotifications, prevOut)
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}
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case item := <-n.chainUpdates.ChanOut():
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update := item.(*filteredBlock)
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if update.connect {
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n.heightMtx.Lock()
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if update.height != n.bestHeight+1 {
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chainntnfs.Log.Warnf("Received blocks out of order: "+
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"current height=%d, new height=%d",
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n.bestHeight, update.height)
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}
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n.bestHeight = update.height
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n.heightMtx.Unlock()
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chainntnfs.Log.Infof("New block: height=%v, sha=%v",
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update.height, update.hash)
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err := n.handleBlockConnected(update)
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if err != nil {
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chainntnfs.Log.Error(err)
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}
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} else {
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n.heightMtx.Lock()
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if update.height != n.bestHeight {
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chainntnfs.Log.Warnf("Received blocks out of order: "+
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"current height=%d, disconnected height=%d",
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n.bestHeight, update.height)
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}
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n.bestHeight = update.height - 1
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n.heightMtx.Unlock()
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chainntnfs.Log.Infof("Block disconnected from main chain: "+
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"height=%v, sha=%v", update.height, update.hash)
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}
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// A new block has been connected to the main chain.
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// Send out any N confirmation notifications which may
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// have been triggered by this new block.
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n.notifyConfs(int32(newBlock.height))
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case item := <-n.staleBlocks.ChanOut():
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staleBlock := item.(*filteredBlock)
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chainntnfs.Log.Warnf("Block disconnected from main "+
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"chain: %v", staleBlock.hash)
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case err := <-n.rescanErr:
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chainntnfs.Log.Errorf("Error during rescan: %v", err)
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@ -525,6 +479,69 @@ chainScan:
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return true
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}
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// handleBlocksConnected applies a chain update for a new block. Any watched
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// transactions included this block will processed to either send notifications
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// now or after numConfirmations confs.
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func (n *NeutrinoNotifier) handleBlockConnected(newBlock *filteredBlock) error {
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// First we'll notify any subscribed clients of the block.
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n.notifyBlockEpochs(int32(newBlock.height), &newBlock.hash)
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// Next, we'll scan over the list of relevant transactions and possibly
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// dispatch notifications for confirmations and spends.
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for _, tx := range newBlock.txns {
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// Check if the inclusion of this transaction within a block by itself
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// triggers a block confirmation threshold, if so send a notification.
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// Otherwise, place the notification on a heap to be triggered in the
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// future once additional confirmations are attained.
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mtx := tx.MsgTx()
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txIndex := tx.Index()
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txSha := mtx.TxHash()
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n.checkConfirmationTrigger(&txSha, newBlock, txIndex)
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for i, txIn := range mtx.TxIn {
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prevOut := txIn.PreviousOutPoint
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// If this transaction indeed does spend an output which we have a
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// registered notification for, then create a spend summary, finally
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// sending off the details to the notification subscriber.
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clients, ok := n.spendNotifications[prevOut]
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if !ok {
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continue
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}
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// TODO(roasbeef): many integration tests expect spend to be
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// notified within the mempool.
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spendDetails := &chainntnfs.SpendDetail{
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SpentOutPoint: &prevOut,
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SpenderTxHash: &txSha,
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SpendingTx: mtx,
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SpenderInputIndex: uint32(i),
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SpendingHeight: int32(newBlock.height),
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}
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for _, ntfn := range clients {
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chainntnfs.Log.Infof("Dispatching spend notification for "+
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"outpoint=%v", ntfn.targetOutpoint)
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ntfn.spendChan <- spendDetails
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// Close spendChan to ensure that any calls to Cancel will not
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// block. This is safe to do since the channel is buffered, and
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// the message can still be read by the receiver.
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close(ntfn.spendChan)
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}
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delete(n.spendNotifications, prevOut)
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}
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}
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// A new block has been connected to the main chain.
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// Send out any N confirmation notifications which may
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// have been triggered by this new block.
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n.notifyConfs(int32(newBlock.height))
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return nil
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}
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// notifyBlockEpochs notifies all registered block epoch clients of the newly
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// connected block to the main chain.
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func (n *NeutrinoNotifier) notifyBlockEpochs(newHeight int32, newSha *chainhash.Hash) {
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