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420 lines
13 KiB
420 lines
13 KiB
package blockchain
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import (
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"fmt"
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"reflect"
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"time"
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amino "github.com/tendermint/go-amino"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/p2p"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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)
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const (
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// BlockchainChannel is a channel for blocks and status updates (`BlockStore` height)
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BlockchainChannel = byte(0x40)
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trySyncIntervalMS = 10
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// stop syncing when last block's time is
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// within this much of the system time.
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// stopSyncingDurationMinutes = 10
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// ask for best height every 10s
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statusUpdateIntervalSeconds = 10
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// check if we should switch to consensus reactor
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switchToConsensusIntervalSeconds = 1
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// NOTE: keep up to date with bcBlockResponseMessage
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bcBlockResponseMessagePrefixSize = 4
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bcBlockResponseMessageFieldKeySize = 1
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maxMsgSize = types.MaxBlockSizeBytes +
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bcBlockResponseMessagePrefixSize +
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bcBlockResponseMessageFieldKeySize
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)
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type consensusReactor interface {
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// for when we switch from blockchain reactor and fast sync to
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// the consensus machine
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SwitchToConsensus(sm.State, int)
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}
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type peerError struct {
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err error
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peerID p2p.ID
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}
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func (e peerError) Error() string {
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return fmt.Sprintf("error with peer %v: %s", e.peerID, e.err.Error())
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}
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// BlockchainReactor handles long-term catchup syncing.
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type BlockchainReactor struct {
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p2p.BaseReactor
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// immutable
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initialState sm.State
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blockExec *sm.BlockExecutor
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store *BlockStore
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pool *BlockPool
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fastSync bool
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requestsCh <-chan BlockRequest
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errorsCh <-chan peerError
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}
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// NewBlockchainReactor returns new reactor instance.
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func NewBlockchainReactor(state sm.State, blockExec *sm.BlockExecutor, store *BlockStore,
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fastSync bool) *BlockchainReactor {
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if state.LastBlockHeight != store.Height() {
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panic(fmt.Sprintf("state (%v) and store (%v) height mismatch", state.LastBlockHeight,
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store.Height()))
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}
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requestsCh := make(chan BlockRequest, maxTotalRequesters)
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const capacity = 1000 // must be bigger than peers count
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errorsCh := make(chan peerError, capacity) // so we don't block in #Receive#pool.AddBlock
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pool := NewBlockPool(
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store.Height()+1,
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requestsCh,
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errorsCh,
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)
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bcR := &BlockchainReactor{
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initialState: state,
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blockExec: blockExec,
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store: store,
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pool: pool,
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fastSync: fastSync,
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requestsCh: requestsCh,
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errorsCh: errorsCh,
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}
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bcR.BaseReactor = *p2p.NewBaseReactor("BlockchainReactor", bcR)
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return bcR
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}
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// SetLogger implements cmn.Service by setting the logger on reactor and pool.
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func (bcR *BlockchainReactor) SetLogger(l log.Logger) {
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bcR.BaseService.Logger = l
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bcR.pool.Logger = l
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}
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// OnStart implements cmn.Service.
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func (bcR *BlockchainReactor) OnStart() error {
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if bcR.fastSync {
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err := bcR.pool.Start()
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if err != nil {
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return err
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}
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go bcR.poolRoutine()
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}
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return nil
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}
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// OnStop implements cmn.Service.
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func (bcR *BlockchainReactor) OnStop() {
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bcR.pool.Stop()
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}
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// GetChannels implements Reactor
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func (bcR *BlockchainReactor) GetChannels() []*p2p.ChannelDescriptor {
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return []*p2p.ChannelDescriptor{
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{
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ID: BlockchainChannel,
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Priority: 10,
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SendQueueCapacity: 1000,
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RecvBufferCapacity: 50 * 4096,
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RecvMessageCapacity: maxMsgSize,
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},
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}
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}
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// AddPeer implements Reactor by sending our state to peer.
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func (bcR *BlockchainReactor) AddPeer(peer p2p.Peer) {
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msgBytes := cdc.MustMarshalBinaryBare(&bcStatusResponseMessage{bcR.store.Height()})
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if !peer.Send(BlockchainChannel, msgBytes) {
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// doing nothing, will try later in `poolRoutine`
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}
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// peer is added to the pool once we receive the first
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// bcStatusResponseMessage from the peer and call pool.SetPeerHeight
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}
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// RemovePeer implements Reactor by removing peer from the pool.
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func (bcR *BlockchainReactor) RemovePeer(peer p2p.Peer, reason interface{}) {
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bcR.pool.RemovePeer(peer.ID())
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}
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// respondToPeer loads a block and sends it to the requesting peer,
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// if we have it. Otherwise, we'll respond saying we don't have it.
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// According to the Tendermint spec, if all nodes are honest,
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// no node should be requesting for a block that's non-existent.
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func (bcR *BlockchainReactor) respondToPeer(msg *bcBlockRequestMessage,
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src p2p.Peer) (queued bool) {
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block := bcR.store.LoadBlock(msg.Height)
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if block != nil {
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msgBytes := cdc.MustMarshalBinaryBare(&bcBlockResponseMessage{Block: block})
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return src.TrySend(BlockchainChannel, msgBytes)
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}
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bcR.Logger.Info("Peer asking for a block we don't have", "src", src, "height", msg.Height)
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msgBytes := cdc.MustMarshalBinaryBare(&bcNoBlockResponseMessage{Height: msg.Height})
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return src.TrySend(BlockchainChannel, msgBytes)
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}
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// Receive implements Reactor by handling 4 types of messages (look below).
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func (bcR *BlockchainReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
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msg, err := decodeMsg(msgBytes)
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if err != nil {
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bcR.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
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bcR.Switch.StopPeerForError(src, err)
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return
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}
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bcR.Logger.Debug("Receive", "src", src, "chID", chID, "msg", msg)
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switch msg := msg.(type) {
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case *bcBlockRequestMessage:
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if queued := bcR.respondToPeer(msg, src); !queued {
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// Unfortunately not queued since the queue is full.
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}
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case *bcBlockResponseMessage:
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// Got a block.
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bcR.pool.AddBlock(src.ID(), msg.Block, len(msgBytes))
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case *bcStatusRequestMessage:
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// Send peer our state.
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msgBytes := cdc.MustMarshalBinaryBare(&bcStatusResponseMessage{bcR.store.Height()})
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queued := src.TrySend(BlockchainChannel, msgBytes)
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if !queued {
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// sorry
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}
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case *bcStatusResponseMessage:
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// Got a peer status. Unverified.
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bcR.pool.SetPeerHeight(src.ID(), msg.Height)
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default:
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bcR.Logger.Error(fmt.Sprintf("Unknown message type %v", reflect.TypeOf(msg)))
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}
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}
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// Handle messages from the poolReactor telling the reactor what to do.
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// NOTE: Don't sleep in the FOR_LOOP or otherwise slow it down!
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func (bcR *BlockchainReactor) poolRoutine() {
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trySyncTicker := time.NewTicker(trySyncIntervalMS * time.Millisecond)
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statusUpdateTicker := time.NewTicker(statusUpdateIntervalSeconds * time.Second)
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switchToConsensusTicker := time.NewTicker(switchToConsensusIntervalSeconds * time.Second)
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blocksSynced := 0
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chainID := bcR.initialState.ChainID
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state := bcR.initialState
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lastHundred := time.Now()
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lastRate := 0.0
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didProcessCh := make(chan struct{}, 1)
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FOR_LOOP:
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for {
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select {
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case request := <-bcR.requestsCh:
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peer := bcR.Switch.Peers().Get(request.PeerID)
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if peer == nil {
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continue FOR_LOOP // Peer has since been disconnected.
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}
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msgBytes := cdc.MustMarshalBinaryBare(&bcBlockRequestMessage{request.Height})
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queued := peer.TrySend(BlockchainChannel, msgBytes)
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if !queued {
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// We couldn't make the request, send-queue full.
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// The pool handles timeouts, just let it go.
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continue FOR_LOOP
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}
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case err := <-bcR.errorsCh:
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peer := bcR.Switch.Peers().Get(err.peerID)
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if peer != nil {
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bcR.Switch.StopPeerForError(peer, err)
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}
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case <-statusUpdateTicker.C:
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// ask for status updates
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go bcR.BroadcastStatusRequest() // nolint: errcheck
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case <-switchToConsensusTicker.C:
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height, numPending, lenRequesters := bcR.pool.GetStatus()
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outbound, inbound, _ := bcR.Switch.NumPeers()
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bcR.Logger.Debug("Consensus ticker", "numPending", numPending, "total", lenRequesters,
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"outbound", outbound, "inbound", inbound)
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if bcR.pool.IsCaughtUp() {
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bcR.Logger.Info("Time to switch to consensus reactor!", "height", height)
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bcR.pool.Stop()
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conR := bcR.Switch.Reactor("CONSENSUS").(consensusReactor)
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conR.SwitchToConsensus(state, blocksSynced)
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break FOR_LOOP
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}
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case <-trySyncTicker.C: // chan time
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select {
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case didProcessCh <- struct{}{}:
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default:
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}
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case <-didProcessCh:
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// NOTE: It is a subtle mistake to process more than a single block
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// at a time (e.g. 10) here, because we only TrySend 1 request per
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// loop. The ratio mismatch can result in starving of blocks, a
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// sudden burst of requests and responses, and repeat.
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// Consequently, it is better to split these routines rather than
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// coupling them as it's written here. TODO uncouple from request
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// routine.
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// See if there are any blocks to sync.
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first, second := bcR.pool.PeekTwoBlocks()
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//bcR.Logger.Info("TrySync peeked", "first", first, "second", second)
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if first == nil || second == nil {
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// We need both to sync the first block.
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continue FOR_LOOP
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} else {
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// Try again quickly next loop.
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didProcessCh <- struct{}{}
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}
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firstParts := first.MakePartSet(types.BlockPartSizeBytes)
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firstPartsHeader := firstParts.Header()
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firstID := types.BlockID{first.Hash(), firstPartsHeader}
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// Finally, verify the first block using the second's commit
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// NOTE: we can probably make this more efficient, but note that calling
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// first.Hash() doesn't verify the tx contents, so MakePartSet() is
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// currently necessary.
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err := state.Validators.VerifyCommit(
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chainID, firstID, first.Height, second.LastCommit)
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if err != nil {
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bcR.Logger.Error("Error in validation", "err", err)
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peerID := bcR.pool.RedoRequest(first.Height)
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peer := bcR.Switch.Peers().Get(peerID)
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if peer != nil {
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// NOTE: we've already removed the peer's request, but we
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// still need to clean up the rest.
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bcR.Switch.StopPeerForError(peer, fmt.Errorf("BlockchainReactor validation error: %v", err))
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}
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continue FOR_LOOP
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} else {
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bcR.pool.PopRequest()
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// TODO: batch saves so we dont persist to disk every block
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bcR.store.SaveBlock(first, firstParts, second.LastCommit)
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// TODO: same thing for app - but we would need a way to
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// get the hash without persisting the state
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var err error
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state, err = bcR.blockExec.ApplyBlock(state, firstID, first)
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if err != nil {
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// TODO This is bad, are we zombie?
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cmn.PanicQ(fmt.Sprintf("Failed to process committed block (%d:%X): %v",
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first.Height, first.Hash(), err))
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}
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blocksSynced++
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if blocksSynced%100 == 0 {
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lastRate = 0.9*lastRate + 0.1*(100/time.Since(lastHundred).Seconds())
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bcR.Logger.Info("Fast Sync Rate", "height", bcR.pool.height,
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"max_peer_height", bcR.pool.MaxPeerHeight(), "blocks/s", lastRate)
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lastHundred = time.Now()
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}
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}
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continue FOR_LOOP
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case <-bcR.Quit():
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break FOR_LOOP
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}
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}
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}
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// BroadcastStatusRequest broadcasts `BlockStore` height.
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func (bcR *BlockchainReactor) BroadcastStatusRequest() error {
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msgBytes := cdc.MustMarshalBinaryBare(&bcStatusRequestMessage{bcR.store.Height()})
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bcR.Switch.Broadcast(BlockchainChannel, msgBytes)
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return nil
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}
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//-----------------------------------------------------------------------------
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// Messages
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// BlockchainMessage is a generic message for this reactor.
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type BlockchainMessage interface{}
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func RegisterBlockchainMessages(cdc *amino.Codec) {
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cdc.RegisterInterface((*BlockchainMessage)(nil), nil)
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cdc.RegisterConcrete(&bcBlockRequestMessage{}, "tendermint/blockchain/BlockRequest", nil)
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cdc.RegisterConcrete(&bcBlockResponseMessage{}, "tendermint/blockchain/BlockResponse", nil)
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cdc.RegisterConcrete(&bcNoBlockResponseMessage{}, "tendermint/blockchain/NoBlockResponse", nil)
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cdc.RegisterConcrete(&bcStatusResponseMessage{}, "tendermint/blockchain/StatusResponse", nil)
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cdc.RegisterConcrete(&bcStatusRequestMessage{}, "tendermint/blockchain/StatusRequest", nil)
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}
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func decodeMsg(bz []byte) (msg BlockchainMessage, err error) {
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if len(bz) > maxMsgSize {
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return msg, fmt.Errorf("Msg exceeds max size (%d > %d)", len(bz), maxMsgSize)
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}
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err = cdc.UnmarshalBinaryBare(bz, &msg)
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return
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}
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//-------------------------------------
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type bcBlockRequestMessage struct {
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Height int64
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}
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func (m *bcBlockRequestMessage) String() string {
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return fmt.Sprintf("[bcBlockRequestMessage %v]", m.Height)
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}
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type bcNoBlockResponseMessage struct {
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Height int64
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}
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func (brm *bcNoBlockResponseMessage) String() string {
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return fmt.Sprintf("[bcNoBlockResponseMessage %d]", brm.Height)
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}
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//-------------------------------------
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type bcBlockResponseMessage struct {
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Block *types.Block
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}
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func (m *bcBlockResponseMessage) String() string {
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return fmt.Sprintf("[bcBlockResponseMessage %v]", m.Block.Height)
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}
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//-------------------------------------
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type bcStatusRequestMessage struct {
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Height int64
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}
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func (m *bcStatusRequestMessage) String() string {
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return fmt.Sprintf("[bcStatusRequestMessage %v]", m.Height)
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}
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//-------------------------------------
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type bcStatusResponseMessage struct {
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Height int64
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}
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func (m *bcStatusResponseMessage) String() string {
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return fmt.Sprintf("[bcStatusResponseMessage %v]", m.Height)
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}
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