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426 lines
13 KiB
426 lines
13 KiB
package v0
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import (
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"fmt"
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"reflect"
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"time"
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bc "github.com/tendermint/tendermint/blockchain"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/p2p"
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bcproto "github.com/tendermint/tendermint/proto/tendermint/blockchain"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/store"
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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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)
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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(state sm.State, skipWAL bool)
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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 *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 *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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startHeight := store.Height() + 1
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if startHeight == 1 {
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startHeight = state.InitialHeight
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}
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pool := NewBlockPool(startHeight, requestsCh, errorsCh)
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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 service.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 service.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(false)
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}
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return nil
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}
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// SwitchToFastSync is called by the state sync reactor when switching to fast sync.
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func (bcR *BlockchainReactor) SwitchToFastSync(state sm.State) error {
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bcR.fastSync = true
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bcR.initialState = state
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bcR.pool.height = state.LastBlockHeight + 1
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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(true)
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return nil
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}
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// OnStop implements service.Service.
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func (bcR *BlockchainReactor) OnStop() {
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if bcR.fastSync {
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if err := bcR.pool.Stop(); err != nil {
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bcR.Logger.Error("Error stopping pool", "err", err)
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}
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}
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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: bc.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, err := bc.EncodeMsg(&bcproto.StatusResponse{
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Base: bcR.store.Base(),
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Height: bcR.store.Height()})
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if err != nil {
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bcR.Logger.Error("could not convert msg to protobuf", "err", err)
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return
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}
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peer.Send(BlockchainChannel, msgBytes)
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// it's OK if send fails. will try later in poolRoutine
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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.SetPeerRange
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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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func (bcR *BlockchainReactor) respondToPeer(msg *bcproto.BlockRequest,
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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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bl, err := block.ToProto()
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if err != nil {
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bcR.Logger.Error("could not convert msg to protobuf", "err", err)
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return false
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}
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msgBytes, err := bc.EncodeMsg(&bcproto.BlockResponse{Block: bl})
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if err != nil {
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bcR.Logger.Error("could not marshal msg", "err", err)
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return false
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}
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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, err := bc.EncodeMsg(&bcproto.NoBlockResponse{Height: msg.Height})
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if err != nil {
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bcR.Logger.Error("could not convert msg to protobuf", "err", err)
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return false
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}
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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 := bc.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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if err = bc.ValidateMsg(msg); err != nil {
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bcR.Logger.Error("Peer sent us invalid msg", "peer", src, "msg", msg, "err", err)
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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 *bcproto.BlockRequest:
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bcR.respondToPeer(msg, src)
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case *bcproto.BlockResponse:
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bi, err := types.BlockFromProto(msg.Block)
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if err != nil {
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bcR.Logger.Error("Block content is invalid", "err", err)
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return
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}
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bcR.pool.AddBlock(src.ID(), bi, len(msgBytes))
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case *bcproto.StatusRequest:
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// Send peer our state.
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msgBytes, err := bc.EncodeMsg(&bcproto.StatusResponse{
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Height: bcR.store.Height(),
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Base: bcR.store.Base(),
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})
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if err != nil {
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bcR.Logger.Error("could not convert msg to protobut", "err", err)
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return
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}
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src.TrySend(BlockchainChannel, msgBytes)
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case *bcproto.StatusResponse:
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// Got a peer status. Unverified.
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bcR.pool.SetPeerRange(src.ID(), msg.Base, msg.Height)
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case *bcproto.NoBlockResponse:
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bcR.Logger.Debug("Peer does not have requested block", "peer", src, "height", 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(stateSynced bool) {
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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 := uint64(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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go func() {
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for {
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select {
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case <-bcR.Quit():
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return
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case <-bcR.pool.Quit():
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return
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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
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}
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msgBytes, err := bc.EncodeMsg(&bcproto.BlockRequest{Height: request.Height})
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if err != nil {
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bcR.Logger.Error("could not convert msg to proto", "err", err)
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continue
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}
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queued := peer.TrySend(BlockchainChannel, msgBytes)
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if !queued {
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bcR.Logger.Debug("Send queue is full, drop block request", "peer", peer.ID(), "height", request.Height)
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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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}
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}
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}()
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FOR_LOOP:
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for {
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select {
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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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if err := bcR.pool.Stop(); err != nil {
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bcR.Logger.Error("Error stopping pool", "err", err)
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}
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conR, ok := bcR.Switch.Reactor("CONSENSUS").(consensusReactor)
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if ok {
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conR.SwitchToConsensus(state, blocksSynced > 0 || stateSynced)
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}
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// else {
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// should only happen during testing
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// }
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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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firstPartSetHeader := firstParts.Header()
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firstID := types.BlockID{Hash: first.Hash(), PartSetHeader: firstPartSetHeader}
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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.VerifyCommitLight(
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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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peerID2 := bcR.pool.RedoRequest(second.Height)
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peer2 := bcR.Switch.Peers().Get(peerID2)
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if peer2 != nil && peer2 != peer {
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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(peer2, 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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panic(fmt.Sprintf("Failed to process committed block (%d:%X): %v", 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` base and height.
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func (bcR *BlockchainReactor) BroadcastStatusRequest() error {
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bm, err := bc.EncodeMsg(&bcproto.StatusRequest{})
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if err != nil {
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bcR.Logger.Error("could not convert msg to proto", "err", err)
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return fmt.Errorf("could not convert msg to proto: %w", err)
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}
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bcR.Switch.Broadcast(BlockchainChannel, bm)
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return nil
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}
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