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344 lines
11 KiB
344 lines
11 KiB
package blockchain
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import (
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"bytes"
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"errors"
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"reflect"
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"time"
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wire "github.com/tendermint/go-wire"
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"github.com/tendermint/tendermint/p2p"
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"github.com/tendermint/tendermint/proxy"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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cmn "github.com/tendermint/tmlibs/common"
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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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defaultChannelCapacity = 100
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trySyncIntervalMS = 100
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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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maxBlockchainResponseSize = types.MaxBlockSize + 2
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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)
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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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state *sm.State
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proxyAppConn proxy.AppConnConsensus // same as consensus.proxyAppConn
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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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timeoutsCh chan string
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evsw types.EventSwitch
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}
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// NewBlockchainReactor returns new reactor instance.
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func NewBlockchainReactor(state *sm.State, proxyAppConn proxy.AppConnConsensus, store *BlockStore, fastSync bool) *BlockchainReactor {
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if state.LastBlockHeight == store.Height()-1 {
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store.height-- // XXX HACK, make this better
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}
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if state.LastBlockHeight != store.Height() {
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cmn.PanicSanity(cmn.Fmt("state (%v) and store (%v) height mismatch", state.LastBlockHeight, store.Height()))
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}
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requestsCh := make(chan BlockRequest, defaultChannelCapacity)
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timeoutsCh := make(chan string, defaultChannelCapacity)
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pool := NewBlockPool(
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store.Height()+1,
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requestsCh,
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timeoutsCh,
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)
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bcR := &BlockchainReactor{
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state: state,
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proxyAppConn: proxyAppConn,
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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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timeoutsCh: timeoutsCh,
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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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// OnStart implements BaseService
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func (bcR *BlockchainReactor) OnStart() error {
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bcR.BaseReactor.OnStart()
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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 BaseService
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func (bcR *BlockchainReactor) OnStop() {
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bcR.BaseReactor.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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&p2p.ChannelDescriptor{
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ID: BlockchainChannel,
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Priority: 5,
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SendQueueCapacity: 100,
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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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if !peer.Send(BlockchainChannel, struct{ BlockchainMessage }{&bcStatusResponseMessage{bcR.store.Height()}}) {
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// doing nothing, will try later in `poolRoutine`
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}
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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.Key)
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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 := DecodeMessage(msgBytes)
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if err != nil {
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bcR.Logger.Error("Error decoding message", "error", 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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// [zr] note: the `megacheck` tool (go vet on steroids)
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// really dislikes the logic in this switch
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switch msg := msg.(type) {
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case *bcBlockRequestMessage:
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// Got a request for a block. Respond with block if we have it.
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block := bcR.store.LoadBlock(msg.Height)
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if block != nil {
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msg := &bcBlockResponseMessage{Block: block}
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queued := src.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
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if !queued {
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// queue is full, just ignore.
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}
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} else {
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// TODO peer is asking for things we don't have.
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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.Key, msg.Block, len(msgBytes))
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case *bcStatusRequestMessage:
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// Send peer our state.
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queued := src.TrySend(BlockchainChannel, struct{ BlockchainMessage }{&bcStatusResponseMessage{bcR.store.Height()}})
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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.Key, msg.Height)
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default:
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bcR.Logger.Error(cmn.Fmt("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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// (Except for the SYNC_LOOP, which is the primary purpose and must be synchronous.)
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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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FOR_LOOP:
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for {
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select {
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case request := <-bcR.requestsCh: // chan BlockRequest
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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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msg := &bcBlockRequestMessage{request.Height}
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queued := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
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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 peerID := <-bcR.timeoutsCh: // chan string
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// Peer timed out.
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peer := bcR.Switch.Peers().Get(peerID)
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if peer != nil {
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bcR.Switch.StopPeerForError(peer, errors.New("BlockchainReactor Timeout"))
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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()
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case <-switchToConsensusTicker.C:
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height, numPending, _ := bcR.pool.GetStatus()
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outbound, inbound, _ := bcR.Switch.NumPeers()
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bcR.Logger.Info("Consensus ticker", "numPending", numPending, "total", len(bcR.pool.requesters),
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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(bcR.state)
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break FOR_LOOP
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}
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case <-trySyncTicker.C: // chan time
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// This loop can be slow as long as it's doing syncing work.
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SYNC_LOOP:
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for i := 0; i < 10; i++ {
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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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break SYNC_LOOP
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}
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firstParts := first.MakePartSet(types.DefaultBlockPartSize)
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firstPartsHeader := firstParts.Header()
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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 := bcR.state.Validators.VerifyCommit(
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bcR.state.ChainID, types.BlockID{first.Hash(), firstPartsHeader}, first.Height, second.LastCommit)
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if err != nil {
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bcR.Logger.Info("error in validation", "error", err)
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bcR.pool.RedoRequest(first.Height)
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break SYNC_LOOP
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} else {
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bcR.pool.PopRequest()
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bcR.store.SaveBlock(first, firstParts, second.LastCommit)
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// TODO: should we be firing events? need to fire NewBlock events manually ...
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// NOTE: we could improve performance if we
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// didn't make the app commit to disk every block
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// ... but we would need a way to get the hash without it persisting
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err := bcR.state.ApplyBlock(bcR.evsw, bcR.proxyAppConn, first, firstPartsHeader, types.MockMempool{})
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if err != nil {
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// TODO This is bad, are we zombie?
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cmn.PanicQ(cmn.Fmt("Failed to process committed block (%d:%X): %v", first.Height, first.Hash(), err))
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}
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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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bcR.Switch.Broadcast(BlockchainChannel, struct{ BlockchainMessage }{&bcStatusRequestMessage{bcR.store.Height()}})
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return nil
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}
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// SetEventSwitch implements events.Eventable
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func (bcR *BlockchainReactor) SetEventSwitch(evsw types.EventSwitch) {
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bcR.evsw = evsw
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}
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//-----------------------------------------------------------------------------
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// Messages
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const (
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msgTypeBlockRequest = byte(0x10)
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msgTypeBlockResponse = byte(0x11)
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msgTypeStatusResponse = byte(0x20)
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msgTypeStatusRequest = byte(0x21)
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)
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// BlockchainMessage is a generic message for this reactor.
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type BlockchainMessage interface{}
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var _ = wire.RegisterInterface(
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struct{ BlockchainMessage }{},
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wire.ConcreteType{&bcBlockRequestMessage{}, msgTypeBlockRequest},
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wire.ConcreteType{&bcBlockResponseMessage{}, msgTypeBlockResponse},
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wire.ConcreteType{&bcStatusResponseMessage{}, msgTypeStatusResponse},
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wire.ConcreteType{&bcStatusRequestMessage{}, msgTypeStatusRequest},
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)
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// DecodeMessage decodes BlockchainMessage.
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// TODO: ensure that bz is completely read.
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func DecodeMessage(bz []byte) (msgType byte, msg BlockchainMessage, err error) {
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msgType = bz[0]
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n := int(0)
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r := bytes.NewReader(bz)
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msg = wire.ReadBinary(struct{ BlockchainMessage }{}, r, maxBlockchainResponseSize, &n, &err).(struct{ BlockchainMessage }).BlockchainMessage
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if err != nil && n != len(bz) {
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err = errors.New("DecodeMessage() had bytes left over")
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}
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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 int
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}
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func (m *bcBlockRequestMessage) String() string {
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return cmn.Fmt("[bcBlockRequestMessage %v]", m.Height)
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}
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//-------------------------------------
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// NOTE: keep up-to-date with maxBlockchainResponseSize
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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 cmn.Fmt("[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 int
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}
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func (m *bcStatusRequestMessage) String() string {
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return cmn.Fmt("[bcStatusRequestMessage %v]", m.Height)
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}
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//-------------------------------------
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type bcStatusResponseMessage struct {
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Height int
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}
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func (m *bcStatusResponseMessage) String() string {
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return cmn.Fmt("[bcStatusResponseMessage %v]", m.Height)
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}
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