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560 lines
16 KiB
560 lines
16 KiB
package v1
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import (
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"fmt"
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"reflect"
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"time"
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"github.com/tendermint/tendermint/behaviour"
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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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trySendIntervalMS = 10
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// ask for best height every 10s
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statusUpdateIntervalSeconds = 10
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)
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var (
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// Maximum number of requests that can be pending per peer, i.e. for which requests have been sent but blocks
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// have not been received.
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maxRequestsPerPeer = 20
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// Maximum number of block requests for the reactor, pending or for which blocks have been received.
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maxNumRequests = 64
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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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// BlockchainReactor handles long-term catchup syncing.
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type BlockchainReactor struct {
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p2p.BaseReactor
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initialState sm.State // immutable
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state sm.State
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blockExec *sm.BlockExecutor
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store *store.BlockStore
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fastSync bool
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stateSynced bool
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fsm *BcReactorFSM
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blocksSynced uint64
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// Receive goroutine forwards messages to this channel to be processed in the context of the poolRoutine.
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messagesForFSMCh chan bcReactorMessage
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// Switch goroutine may send RemovePeer to the blockchain reactor. This is an error message that is relayed
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// to this channel to be processed in the context of the poolRoutine.
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errorsForFSMCh chan bcReactorMessage
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// This channel is used by the FSM and indirectly the block pool to report errors to the blockchain reactor and
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// the switch.
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eventsFromFSMCh chan bcFsmMessage
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swReporter *behaviour.SwitchReporter
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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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const capacity = 1000
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eventsFromFSMCh := make(chan bcFsmMessage, capacity)
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messagesForFSMCh := make(chan bcReactorMessage, capacity)
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errorsForFSMCh := make(chan bcReactorMessage, capacity)
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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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bcR := &BlockchainReactor{
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initialState: state,
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state: state,
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blockExec: blockExec,
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fastSync: fastSync,
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store: store,
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messagesForFSMCh: messagesForFSMCh,
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eventsFromFSMCh: eventsFromFSMCh,
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errorsForFSMCh: errorsForFSMCh,
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}
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fsm := NewFSM(startHeight, bcR)
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bcR.fsm = fsm
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bcR.BaseReactor = *p2p.NewBaseReactor("BlockchainReactor", bcR)
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//bcR.swReporter = behaviour.NewSwitchReporter(bcR.BaseReactor.Switch)
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return bcR
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}
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// bcReactorMessage is used by the reactor to send messages to the FSM.
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type bcReactorMessage struct {
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event bReactorEvent
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data bReactorEventData
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}
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type bFsmEvent uint
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const (
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// message type events
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peerErrorEv = iota + 1
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syncFinishedEv
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)
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type bFsmEventData struct {
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peerID p2p.ID
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err error
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}
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// bcFsmMessage is used by the FSM to send messages to the reactor
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type bcFsmMessage struct {
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event bFsmEvent
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data bFsmEventData
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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.fsm.SetLogger(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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bcR.swReporter = behaviour.NewSwitchReporter(bcR.BaseReactor.Switch)
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if bcR.fastSync {
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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 service.Service.
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func (bcR *BlockchainReactor) OnStop() {
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_ = bcR.Stop()
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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.state = state
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bcR.stateSynced = true
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bcR.fsm = NewFSM(state.LastBlockHeight+1, bcR)
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bcR.fsm.SetLogger(bcR.Logger)
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go bcR.poolRoutine()
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return nil
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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: 2000,
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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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})
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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.updatePeer()
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}
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// sendBlockToPeer loads a block and sends it to the requesting peer.
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// If the block doesn't exist a bcNoBlockResponseMessage is sent.
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// If all nodes are honest, no node should be requesting for a block that doesn't exist.
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func (bcR *BlockchainReactor) sendBlockToPeer(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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pbbi, err := block.ToProto()
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if err != nil {
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bcR.Logger.Error("Could not send block message to peer", "err", err)
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return false
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}
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msgBytes, err := bc.EncodeMsg(&bcproto.BlockResponse{Block: pbbi})
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if err != nil {
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bcR.Logger.Error("unable to 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("unable to 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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func (bcR *BlockchainReactor) sendStatusResponseToPeer(msg *bcproto.StatusRequest, src p2p.Peer) (queued bool) {
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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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})
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if err != nil {
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bcR.Logger.Error("unable to 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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// 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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msgData := bcReactorMessage{
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event: peerRemoveEv,
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data: bReactorEventData{
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peerID: peer.ID(),
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err: errSwitchRemovesPeer,
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},
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}
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bcR.errorsForFSMCh <- msgData
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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",
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"src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
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_ = bcR.swReporter.Report(behaviour.BadMessage(src.ID(), err.Error()))
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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.swReporter.Report(behaviour.BadMessage(src.ID(), err.Error()))
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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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if queued := bcR.sendBlockToPeer(msg, src); !queued {
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// Unfortunately not queued since the queue is full.
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bcR.Logger.Error("Could not send block message to peer", "src", src, "height", msg.Height)
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}
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case *bcproto.StatusRequest:
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// Send peer our state.
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if queued := bcR.sendStatusResponseToPeer(msg, src); !queued {
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// Unfortunately not queued since the queue is full.
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bcR.Logger.Error("Could not send status message to peer", "src", src)
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}
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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("error transition block from protobuf", "err", err)
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return
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}
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msgForFSM := bcReactorMessage{
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event: blockResponseEv,
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data: bReactorEventData{
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peerID: src.ID(),
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height: bi.Height,
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block: bi,
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length: len(msgBytes),
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},
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}
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bcR.Logger.Info("Received", "src", src, "height", bi.Height)
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bcR.messagesForFSMCh <- msgForFSM
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case *bcproto.StatusResponse:
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// Got a peer status. Unverified.
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msgForFSM := bcReactorMessage{
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event: statusResponseEv,
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data: bReactorEventData{
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peerID: src.ID(),
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height: msg.Height,
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length: len(msgBytes),
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},
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}
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bcR.messagesForFSMCh <- msgForFSM
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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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// processBlocksRoutine processes blocks until signlaed to stop over the stopProcessing channel
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func (bcR *BlockchainReactor) processBlocksRoutine(stopProcessing chan struct{}) {
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processReceivedBlockTicker := time.NewTicker(trySyncIntervalMS * time.Millisecond)
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doProcessBlockCh := make(chan struct{}, 1)
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lastHundred := time.Now()
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lastRate := 0.0
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ForLoop:
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for {
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select {
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case <-stopProcessing:
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bcR.Logger.Info("finishing block execution")
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break ForLoop
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case <-processReceivedBlockTicker.C: // try to execute blocks
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select {
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case doProcessBlockCh <- struct{}{}:
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default:
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}
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case <-doProcessBlockCh:
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for {
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err := bcR.processBlock()
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if err == errMissingBlock {
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break
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}
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// Notify FSM of block processing result.
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msgForFSM := bcReactorMessage{
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event: processedBlockEv,
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data: bReactorEventData{
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err: err,
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},
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}
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_ = bcR.fsm.Handle(&msgForFSM)
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if err != nil {
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break
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}
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bcR.blocksSynced++
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if bcR.blocksSynced%100 == 0 {
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lastRate = 0.9*lastRate + 0.1*(100/time.Since(lastHundred).Seconds())
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height, maxPeerHeight := bcR.fsm.Status()
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bcR.Logger.Info("Fast Sync Rate", "height", height,
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"max_peer_height", maxPeerHeight, "blocks/s", lastRate)
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lastHundred = time.Now()
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}
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}
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}
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}
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}
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// poolRoutine receives and handles messages from the Receive() routine and from the FSM.
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func (bcR *BlockchainReactor) poolRoutine() {
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bcR.fsm.Start()
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sendBlockRequestTicker := time.NewTicker(trySendIntervalMS * time.Millisecond)
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statusUpdateTicker := time.NewTicker(statusUpdateIntervalSeconds * time.Second)
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stopProcessing := make(chan struct{}, 1)
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go bcR.processBlocksRoutine(stopProcessing)
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ForLoop:
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for {
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select {
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case <-sendBlockRequestTicker.C:
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if !bcR.fsm.NeedsBlocks() {
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continue
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}
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_ = bcR.fsm.Handle(&bcReactorMessage{
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event: makeRequestsEv,
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data: bReactorEventData{
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maxNumRequests: maxNumRequests}})
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case <-statusUpdateTicker.C:
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// Ask for status updates.
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go bcR.sendStatusRequest()
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case msg := <-bcR.messagesForFSMCh:
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// Sent from the Receive() routine when status (statusResponseEv) and
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// block (blockResponseEv) response events are received
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_ = bcR.fsm.Handle(&msg)
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case msg := <-bcR.errorsForFSMCh:
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// Sent from the switch.RemovePeer() routine (RemovePeerEv) and
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// FSM state timer expiry routine (stateTimeoutEv).
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_ = bcR.fsm.Handle(&msg)
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case msg := <-bcR.eventsFromFSMCh:
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switch msg.event {
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case syncFinishedEv:
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stopProcessing <- struct{}{}
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// Sent from the FSM when it enters finished state.
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break ForLoop
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case peerErrorEv:
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// Sent from the FSM when it detects peer error
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bcR.reportPeerErrorToSwitch(msg.data.err, msg.data.peerID)
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if msg.data.err == errNoPeerResponse {
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// Sent from the peer timeout handler routine
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_ = bcR.fsm.Handle(&bcReactorMessage{
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event: peerRemoveEv,
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data: bReactorEventData{
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peerID: msg.data.peerID,
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err: msg.data.err,
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},
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})
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}
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// else {
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// For slow peers, or errors due to blocks received from wrong peer
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// the FSM had already removed the peers
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// }
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default:
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bcR.Logger.Error("Event from FSM not supported", "type", msg.event)
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}
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case <-bcR.Quit():
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break ForLoop
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}
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}
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}
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func (bcR *BlockchainReactor) reportPeerErrorToSwitch(err error, peerID p2p.ID) {
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peer := bcR.Switch.Peers().Get(peerID)
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if peer != nil {
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_ = bcR.swReporter.Report(behaviour.BadMessage(peerID, err.Error()))
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}
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}
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func (bcR *BlockchainReactor) processBlock() error {
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first, second, err := bcR.fsm.FirstTwoBlocks()
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if err != nil {
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// We need both to sync the first block.
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return err
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}
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chainID := bcR.initialState.ChainID
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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 = bcR.state.Validators.VerifyCommitLight(chainID, firstID, first.Height, second.LastCommit)
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if err != nil {
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bcR.Logger.Error("error during commit verification", "err", err,
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"first", first.Height, "second", second.Height)
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return errBlockVerificationFailure
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}
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bcR.store.SaveBlock(first, firstParts, second.LastCommit)
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bcR.state, _, err = bcR.blockExec.ApplyBlock(bcR.state, firstID, first)
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if err != nil {
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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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return nil
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}
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// Implements bcRNotifier
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// sendStatusRequest broadcasts `BlockStore` height.
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func (bcR *BlockchainReactor) sendStatusRequest() {
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msgBytes, err := bc.EncodeMsg(&bcproto.StatusRequest{})
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if err != nil {
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panic(err)
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}
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bcR.Switch.Broadcast(BlockchainChannel, msgBytes)
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}
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// Implements bcRNotifier
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// BlockRequest sends `BlockRequest` height.
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func (bcR *BlockchainReactor) sendBlockRequest(peerID p2p.ID, height int64) error {
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peer := bcR.Switch.Peers().Get(peerID)
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if peer == nil {
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return errNilPeerForBlockRequest
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}
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msgBytes, err := bc.EncodeMsg(&bcproto.BlockRequest{Height: height})
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if err != nil {
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return err
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}
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queued := peer.TrySend(BlockchainChannel, msgBytes)
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if !queued {
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return errSendQueueFull
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}
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return nil
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}
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// Implements bcRNotifier
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func (bcR *BlockchainReactor) switchToConsensus() {
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conR, ok := bcR.Switch.Reactor("CONSENSUS").(consensusReactor)
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if ok {
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conR.SwitchToConsensus(bcR.state, bcR.blocksSynced > 0 || bcR.stateSynced)
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bcR.eventsFromFSMCh <- bcFsmMessage{event: syncFinishedEv}
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}
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// else {
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// Should only happen during testing.
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// }
|
|
}
|
|
|
|
// Implements bcRNotifier
|
|
// Called by FSM and pool:
|
|
// - pool calls when it detects slow peer or when peer times out
|
|
// - FSM calls when:
|
|
// - adding a block (addBlock) fails
|
|
// - reactor processing of a block reports failure and FSM sends back the peers of first and second blocks
|
|
func (bcR *BlockchainReactor) sendPeerError(err error, peerID p2p.ID) {
|
|
bcR.Logger.Info("sendPeerError:", "peer", peerID, "error", err)
|
|
msgData := bcFsmMessage{
|
|
event: peerErrorEv,
|
|
data: bFsmEventData{
|
|
peerID: peerID,
|
|
err: err,
|
|
},
|
|
}
|
|
bcR.eventsFromFSMCh <- msgData
|
|
}
|
|
|
|
// Implements bcRNotifier
|
|
func (bcR *BlockchainReactor) resetStateTimer(name string, timer **time.Timer, timeout time.Duration) {
|
|
if timer == nil {
|
|
panic("nil timer pointer parameter")
|
|
}
|
|
if *timer == nil {
|
|
*timer = time.AfterFunc(timeout, func() {
|
|
msg := bcReactorMessage{
|
|
event: stateTimeoutEv,
|
|
data: bReactorEventData{
|
|
stateName: name,
|
|
},
|
|
}
|
|
bcR.errorsForFSMCh <- msg
|
|
})
|
|
} else {
|
|
(*timer).Reset(timeout)
|
|
}
|
|
}
|