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341 lines
9.8 KiB
341 lines
9.8 KiB
package blockchain
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import (
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"bytes"
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"errors"
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"fmt"
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"reflect"
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"sync/atomic"
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"time"
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"github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/events"
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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 = byte(0x40)
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defaultChannelCapacity = 100
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defaultSleepIntervalMS = 500
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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 = 10
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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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sw *p2p.Switch
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state *sm.State
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store *BlockStore
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pool *BlockPool
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sync bool
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requestsCh chan BlockRequest
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timeoutsCh chan string
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lastBlock *types.Block
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quit chan struct{}
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running uint32
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evsw events.Fireable
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}
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func NewBlockchainReactor(state *sm.State, store *BlockStore, sync bool) *BlockchainReactor {
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// SANITY CHECK
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if state.LastBlockHeight != store.Height() &&
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state.LastBlockHeight != store.Height()-1 { // XXX double check this logic.
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panic(Fmt("state (%v) and store (%v) height mismatch", state.LastBlockHeight, store.Height()))
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}
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// SANITY CHECK END
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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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store: store,
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pool: pool,
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sync: sync,
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requestsCh: requestsCh,
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timeoutsCh: timeoutsCh,
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quit: make(chan struct{}),
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running: uint32(0),
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}
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return bcR
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}
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// Implements Reactor
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func (bcR *BlockchainReactor) Start(sw *p2p.Switch) {
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if atomic.CompareAndSwapUint32(&bcR.running, 0, 1) {
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log.Info("Starting BlockchainReactor")
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bcR.sw = sw
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if bcR.sync {
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bcR.pool.Start()
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go bcR.poolRoutine()
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}
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}
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}
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// Implements Reactor
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func (bcR *BlockchainReactor) Stop() {
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if atomic.CompareAndSwapUint32(&bcR.running, 1, 0) {
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log.Info("Stopping BlockchainReactor")
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close(bcR.quit)
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bcR.pool.Stop()
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}
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}
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// 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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// Implements Reactor
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func (bcR *BlockchainReactor) AddPeer(peer *p2p.Peer) {
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// Send peer our state.
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peer.Send(BlockchainChannel, &bcStatusResponseMessage{bcR.store.Height()})
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}
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// Implements Reactor
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func (bcR *BlockchainReactor) RemovePeer(peer *p2p.Peer, reason interface{}) {
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// Remove peer from the pool.
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bcR.pool.RemovePeer(peer.Key)
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}
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// Implements Reactor
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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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log.Warn("Error decoding message", "error", err)
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return
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}
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log.Info("Received message", "msg", msg)
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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, 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(msg.Block, src.Key)
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case *bcStatusRequestMessage:
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// Send peer our state.
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queued := src.TrySend(BlockchainChannel, &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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log.Warn(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.sw.Peers().Get(request.PeerId)
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if peer == nil {
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// We can't assign the request.
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continue FOR_LOOP
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}
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msg := &bcBlockRequestMessage{request.Height}
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queued := peer.TrySend(BlockchainChannel, 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 retries, so 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.sw.Peers().Get(peerId)
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if peer != nil {
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bcR.sw.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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// not thread safe access for numUnassigned and numPending but should be fine
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// TODO make threadsafe and use exposed functions
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outbound, inbound, _ := bcR.sw.NumPeers()
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log.Debug("Consensus ticker", "numUnassigned", bcR.pool.numUnassigned, "numPending", bcR.pool.numPending,
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"total", len(bcR.pool.requests), "outbound", outbound, "inbound", inbound)
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// NOTE: this condition is very strict right now. may need to weaken
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// If all `maxPendingRequests` requests are unassigned
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// and we have some peers (say >= 3), then we're caught up
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maxPending := bcR.pool.numPending == maxPendingRequests
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allUnassigned := bcR.pool.numPending == bcR.pool.numUnassigned
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enoughPeers := outbound+inbound >= 3
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if maxPending && allUnassigned && enoughPeers {
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log.Info("Time to switch to consensus reactor!", "height", bcR.pool.height)
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bcR.pool.Stop()
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conR := bcR.sw.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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//log.Debug("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()
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firstPartsHeader := firstParts.Header()
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// Finally, verify the first block using the second's validation.
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err := bcR.state.BondedValidators.VerifyValidation(
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bcR.state.ChainID, first.Hash(), firstPartsHeader, first.Height, second.LastValidation)
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if err != nil {
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log.Debug("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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err := sm.ExecBlock(bcR.state, first, firstPartsHeader)
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if err != nil {
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// TODO This is bad, are we zombie?
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panic(Fmt("Failed to process committed block: %v", err))
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}
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bcR.store.SaveBlock(first, firstParts, second.LastValidation)
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bcR.state.Save()
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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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func (bcR *BlockchainReactor) BroadcastStatusResponse() error {
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bcR.sw.Broadcast(BlockchainChannel, &bcStatusResponseMessage{bcR.store.Height()})
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return nil
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}
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func (bcR *BlockchainReactor) BroadcastStatusRequest() error {
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bcR.sw.Broadcast(BlockchainChannel, &bcStatusRequestMessage{bcR.store.Height()})
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return nil
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}
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// implements events.Eventable
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func (bcR *BlockchainReactor) SetFireable(evsw events.Fireable) {
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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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type BlockchainMessage interface{}
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var _ = binary.RegisterInterface(
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struct{ BlockchainMessage }{},
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binary.ConcreteType{&bcBlockRequestMessage{}, msgTypeBlockRequest},
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binary.ConcreteType{&bcBlockResponseMessage{}, msgTypeBlockResponse},
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binary.ConcreteType{&bcStatusResponseMessage{}, msgTypeStatusResponse},
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binary.ConcreteType{&bcStatusRequestMessage{}, msgTypeStatusRequest},
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)
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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 := new(int64)
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r := bytes.NewReader(bz)
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msg = binary.ReadBinary(struct{ BlockchainMessage }{}, r, n, &err).(struct{ BlockchainMessage }).BlockchainMessage
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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 fmt.Sprintf("[bcBlockRequestMessage %v]", m.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 int
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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 int
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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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