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469 lines
15 KiB
469 lines
15 KiB
package consensus
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import (
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"bytes"
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"fmt"
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"hash/crc32"
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"io"
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"reflect"
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//"strconv"
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//"strings"
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"time"
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abci "github.com/tendermint/tendermint/abci/types"
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//auto "github.com/tendermint/tendermint/libs/autofile"
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cmn "github.com/tendermint/tendermint/libs/common"
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dbm "github.com/tendermint/tendermint/libs/db"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/proxy"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/version"
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)
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var crc32c = crc32.MakeTable(crc32.Castagnoli)
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// Functionality to replay blocks and messages on recovery from a crash.
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// There are two general failure scenarios:
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//
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// 1. failure during consensus
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// 2. failure while applying the block
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//
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// The former is handled by the WAL, the latter by the proxyApp Handshake on
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// restart, which ultimately hands off the work to the WAL.
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//-----------------------------------------
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// 1. Recover from failure during consensus
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// (by replaying messages from the WAL)
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//-----------------------------------------
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// Unmarshal and apply a single message to the consensus state as if it were
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// received in receiveRoutine. Lines that start with "#" are ignored.
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// NOTE: receiveRoutine should not be running.
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func (cs *ConsensusState) readReplayMessage(msg *TimedWALMessage, newStepCh chan interface{}) error {
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// Skip meta messages which exist for demarcating boundaries.
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if _, ok := msg.Msg.(EndHeightMessage); ok {
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return nil
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}
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// for logging
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switch m := msg.Msg.(type) {
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case types.EventDataRoundState:
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cs.Logger.Info("Replay: New Step", "height", m.Height, "round", m.Round, "step", m.Step)
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// these are playback checks
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ticker := time.After(time.Second * 2)
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if newStepCh != nil {
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select {
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case mi := <-newStepCh:
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m2 := mi.(types.EventDataRoundState)
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if m.Height != m2.Height || m.Round != m2.Round || m.Step != m2.Step {
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return fmt.Errorf("RoundState mismatch. Got %v; Expected %v", m2, m)
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}
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case <-ticker:
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return fmt.Errorf("Failed to read off newStepCh")
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}
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}
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case msgInfo:
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peerID := m.PeerID
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if peerID == "" {
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peerID = "local"
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}
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switch msg := m.Msg.(type) {
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case *ProposalMessage:
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p := msg.Proposal
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cs.Logger.Info("Replay: Proposal", "height", p.Height, "round", p.Round, "header",
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p.BlockPartsHeader, "pol", p.POLRound, "peer", peerID)
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case *BlockPartMessage:
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cs.Logger.Info("Replay: BlockPart", "height", msg.Height, "round", msg.Round, "peer", peerID)
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case *VoteMessage:
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v := msg.Vote
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cs.Logger.Info("Replay: Vote", "height", v.Height, "round", v.Round, "type", v.Type,
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"blockID", v.BlockID, "peer", peerID)
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}
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cs.handleMsg(m)
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case timeoutInfo:
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cs.Logger.Info("Replay: Timeout", "height", m.Height, "round", m.Round, "step", m.Step, "dur", m.Duration)
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cs.handleTimeout(m, cs.RoundState)
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default:
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return fmt.Errorf("Replay: Unknown TimedWALMessage type: %v", reflect.TypeOf(msg.Msg))
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}
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return nil
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}
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// Replay only those messages since the last block. `timeoutRoutine` should
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// run concurrently to read off tickChan.
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func (cs *ConsensusState) catchupReplay(csHeight int64) error {
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// Set replayMode to true so we don't log signing errors.
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cs.replayMode = true
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defer func() { cs.replayMode = false }()
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// Ensure that #ENDHEIGHT for this height doesn't exist.
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// NOTE: This is just a sanity check. As far as we know things work fine
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// without it, and Handshake could reuse ConsensusState if it weren't for
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// this check (since we can crash after writing #ENDHEIGHT).
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//
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// Ignore data corruption errors since this is a sanity check.
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gr, found, err := cs.wal.SearchForEndHeight(csHeight, &WALSearchOptions{IgnoreDataCorruptionErrors: true})
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if err != nil {
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return err
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}
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if gr != nil {
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if err := gr.Close(); err != nil {
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return err
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}
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}
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if found {
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return fmt.Errorf("WAL should not contain #ENDHEIGHT %d", csHeight)
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}
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// Search for last height marker.
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//
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// Ignore data corruption errors in previous heights because we only care about last height
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gr, found, err = cs.wal.SearchForEndHeight(csHeight-1, &WALSearchOptions{IgnoreDataCorruptionErrors: true})
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if err == io.EOF {
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cs.Logger.Error("Replay: wal.group.Search returned EOF", "#ENDHEIGHT", csHeight-1)
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} else if err != nil {
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return err
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}
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if !found {
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return fmt.Errorf("Cannot replay height %d. WAL does not contain #ENDHEIGHT for %d", csHeight, csHeight-1)
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}
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defer gr.Close() // nolint: errcheck
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cs.Logger.Info("Catchup by replaying consensus messages", "height", csHeight)
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var msg *TimedWALMessage
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dec := WALDecoder{gr}
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for {
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msg, err = dec.Decode()
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if err == io.EOF {
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break
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} else if IsDataCorruptionError(err) {
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cs.Logger.Debug("data has been corrupted in last height of consensus WAL", "err", err, "height", csHeight)
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panic(fmt.Sprintf("data has been corrupted (%v) in last height %d of consensus WAL", err, csHeight))
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} else if err != nil {
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return err
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}
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// NOTE: since the priv key is set when the msgs are received
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// it will attempt to eg double sign but we can just ignore it
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// since the votes will be replayed and we'll get to the next step
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if err := cs.readReplayMessage(msg, nil); err != nil {
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return err
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}
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}
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cs.Logger.Info("Replay: Done")
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return nil
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}
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//--------------------------------------------------------------------------------
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// Parses marker lines of the form:
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// #ENDHEIGHT: 12345
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/*
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func makeHeightSearchFunc(height int64) auto.SearchFunc {
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return func(line string) (int, error) {
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line = strings.TrimRight(line, "\n")
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parts := strings.Split(line, " ")
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if len(parts) != 2 {
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return -1, errors.New("Line did not have 2 parts")
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}
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i, err := strconv.Atoi(parts[1])
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if err != nil {
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return -1, errors.New("Failed to parse INFO: " + err.Error())
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}
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if height < i {
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return 1, nil
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} else if height == i {
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return 0, nil
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} else {
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return -1, nil
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}
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}
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}*/
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//---------------------------------------------------
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// 2. Recover from failure while applying the block.
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// (by handshaking with the app to figure out where
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// we were last, and using the WAL to recover there.)
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//---------------------------------------------------
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type Handshaker struct {
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stateDB dbm.DB
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initialState sm.State
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store sm.BlockStore
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genDoc *types.GenesisDoc
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logger log.Logger
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nBlocks int // number of blocks applied to the state
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}
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func NewHandshaker(stateDB dbm.DB, state sm.State,
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store sm.BlockStore, genDoc *types.GenesisDoc) *Handshaker {
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return &Handshaker{
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stateDB: stateDB,
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initialState: state,
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store: store,
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genDoc: genDoc,
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logger: log.NewNopLogger(),
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nBlocks: 0,
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}
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}
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func (h *Handshaker) SetLogger(l log.Logger) {
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h.logger = l
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}
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func (h *Handshaker) NBlocks() int {
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return h.nBlocks
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}
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// TODO: retry the handshake/replay if it fails ?
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func (h *Handshaker) Handshake(proxyApp proxy.AppConns) error {
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// Handshake is done via ABCI Info on the query conn.
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res, err := proxyApp.Query().InfoSync(abci.RequestInfo{version.Version})
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if err != nil {
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return fmt.Errorf("Error calling Info: %v", err)
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}
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blockHeight := int64(res.LastBlockHeight)
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if blockHeight < 0 {
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return fmt.Errorf("Got a negative last block height (%d) from the app", blockHeight)
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}
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appHash := res.LastBlockAppHash
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h.logger.Info("ABCI Handshake", "appHeight", blockHeight, "appHash", fmt.Sprintf("%X", appHash))
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// TODO: check app version.
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// Replay blocks up to the latest in the blockstore.
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_, err = h.ReplayBlocks(h.initialState, appHash, blockHeight, proxyApp)
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if err != nil {
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return fmt.Errorf("Error on replay: %v", err)
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}
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h.logger.Info("Completed ABCI Handshake - Tendermint and App are synced",
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"appHeight", blockHeight, "appHash", fmt.Sprintf("%X", appHash))
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// TODO: (on restart) replay mempool
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return nil
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}
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// Replay all blocks since appBlockHeight and ensure the result matches the current state.
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// Returns the final AppHash or an error.
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func (h *Handshaker) ReplayBlocks(state sm.State, appHash []byte, appBlockHeight int64, proxyApp proxy.AppConns) ([]byte, error) {
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storeBlockHeight := h.store.Height()
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stateBlockHeight := state.LastBlockHeight
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h.logger.Info("ABCI Replay Blocks", "appHeight", appBlockHeight, "storeHeight", storeBlockHeight, "stateHeight", stateBlockHeight)
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// If appBlockHeight == 0 it means that we are at genesis and hence should send InitChain
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if appBlockHeight == 0 {
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validators := types.TM2PB.Validators(state.Validators)
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csParams := types.TM2PB.ConsensusParams(h.genDoc.ConsensusParams)
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req := abci.RequestInitChain{
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Time: h.genDoc.GenesisTime.Unix(), // TODO
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ChainId: h.genDoc.ChainID,
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ConsensusParams: csParams,
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Validators: validators,
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AppStateBytes: h.genDoc.AppState,
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}
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res, err := proxyApp.Consensus().InitChainSync(req)
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if err != nil {
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return nil, err
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}
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// if the app returned validators
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// or consensus params, update the state
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// with the them
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if len(res.Validators) > 0 {
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vals, err := types.PB2TM.Validators(res.Validators)
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if err != nil {
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return nil, err
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}
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state.Validators = types.NewValidatorSet(vals)
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}
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if res.ConsensusParams != nil {
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state.ConsensusParams = types.PB2TM.ConsensusParams(res.ConsensusParams)
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}
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sm.SaveState(h.stateDB, state)
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}
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// First handle edge cases and constraints on the storeBlockHeight
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if storeBlockHeight == 0 {
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return appHash, checkAppHash(state, appHash)
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} else if storeBlockHeight < appBlockHeight {
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// the app should never be ahead of the store (but this is under app's control)
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return appHash, sm.ErrAppBlockHeightTooHigh{storeBlockHeight, appBlockHeight}
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} else if storeBlockHeight < stateBlockHeight {
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// the state should never be ahead of the store (this is under tendermint's control)
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cmn.PanicSanity(cmn.Fmt("StateBlockHeight (%d) > StoreBlockHeight (%d)", stateBlockHeight, storeBlockHeight))
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} else if storeBlockHeight > stateBlockHeight+1 {
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// store should be at most one ahead of the state (this is under tendermint's control)
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cmn.PanicSanity(cmn.Fmt("StoreBlockHeight (%d) > StateBlockHeight + 1 (%d)", storeBlockHeight, stateBlockHeight+1))
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}
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var err error
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// Now either store is equal to state, or one ahead.
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// For each, consider all cases of where the app could be, given app <= store
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if storeBlockHeight == stateBlockHeight {
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// Tendermint ran Commit and saved the state.
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// Either the app is asking for replay, or we're all synced up.
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if appBlockHeight < storeBlockHeight {
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// the app is behind, so replay blocks, but no need to go through WAL (state is already synced to store)
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return h.replayBlocks(state, proxyApp, appBlockHeight, storeBlockHeight, false)
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} else if appBlockHeight == storeBlockHeight {
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// We're good!
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return appHash, checkAppHash(state, appHash)
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}
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} else if storeBlockHeight == stateBlockHeight+1 {
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// We saved the block in the store but haven't updated the state,
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// so we'll need to replay a block using the WAL.
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if appBlockHeight < stateBlockHeight {
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// the app is further behind than it should be, so replay blocks
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// but leave the last block to go through the WAL
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return h.replayBlocks(state, proxyApp, appBlockHeight, storeBlockHeight, true)
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} else if appBlockHeight == stateBlockHeight {
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// We haven't run Commit (both the state and app are one block behind),
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// so replayBlock with the real app.
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// NOTE: We could instead use the cs.WAL on cs.Start,
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// but we'd have to allow the WAL to replay a block that wrote it's #ENDHEIGHT
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h.logger.Info("Replay last block using real app")
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state, err = h.replayBlock(state, storeBlockHeight, proxyApp.Consensus())
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return state.AppHash, err
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} else if appBlockHeight == storeBlockHeight {
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// We ran Commit, but didn't save the state, so replayBlock with mock app
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abciResponses, err := sm.LoadABCIResponses(h.stateDB, storeBlockHeight)
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if err != nil {
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return nil, err
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}
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mockApp := newMockProxyApp(appHash, abciResponses)
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h.logger.Info("Replay last block using mock app")
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state, err = h.replayBlock(state, storeBlockHeight, mockApp)
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return state.AppHash, err
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}
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}
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cmn.PanicSanity("Should never happen")
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return nil, nil
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}
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func (h *Handshaker) replayBlocks(state sm.State, proxyApp proxy.AppConns, appBlockHeight, storeBlockHeight int64, mutateState bool) ([]byte, error) {
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// App is further behind than it should be, so we need to replay blocks.
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// We replay all blocks from appBlockHeight+1.
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//
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// Note that we don't have an old version of the state,
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// so we by-pass state validation/mutation using sm.ExecCommitBlock.
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// This also means we won't be saving validator sets if they change during this period.
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// TODO: Load the historical information to fix this and just use state.ApplyBlock
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//
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// If mutateState == true, the final block is replayed with h.replayBlock()
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var appHash []byte
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var err error
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finalBlock := storeBlockHeight
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if mutateState {
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finalBlock--
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}
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for i := appBlockHeight + 1; i <= finalBlock; i++ {
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h.logger.Info("Applying block", "height", i)
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block := h.store.LoadBlock(i)
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appHash, err = sm.ExecCommitBlock(proxyApp.Consensus(), block, h.logger, state.LastValidators, h.stateDB)
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if err != nil {
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return nil, err
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}
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h.nBlocks++
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}
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if mutateState {
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// sync the final block
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state, err = h.replayBlock(state, storeBlockHeight, proxyApp.Consensus())
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if err != nil {
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return nil, err
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}
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appHash = state.AppHash
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}
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return appHash, checkAppHash(state, appHash)
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}
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// ApplyBlock on the proxyApp with the last block.
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func (h *Handshaker) replayBlock(state sm.State, height int64, proxyApp proxy.AppConnConsensus) (sm.State, error) {
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block := h.store.LoadBlock(height)
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meta := h.store.LoadBlockMeta(height)
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blockExec := sm.NewBlockExecutor(h.stateDB, h.logger, proxyApp, sm.MockMempool{}, sm.MockEvidencePool{})
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var err error
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state, err = blockExec.ApplyBlock(state, meta.BlockID, block)
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if err != nil {
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return sm.State{}, err
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}
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h.nBlocks++
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return state, nil
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}
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func checkAppHash(state sm.State, appHash []byte) error {
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if !bytes.Equal(state.AppHash, appHash) {
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panic(fmt.Errorf("Tendermint state.AppHash does not match AppHash after replay. Got %X, expected %X", appHash, state.AppHash).Error())
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}
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return nil
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}
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//--------------------------------------------------------------------------------
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// mockProxyApp uses ABCIResponses to give the right results
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// Useful because we don't want to call Commit() twice for the same block on the real app.
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func newMockProxyApp(appHash []byte, abciResponses *sm.ABCIResponses) proxy.AppConnConsensus {
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clientCreator := proxy.NewLocalClientCreator(&mockProxyApp{
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appHash: appHash,
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abciResponses: abciResponses,
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})
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cli, _ := clientCreator.NewABCIClient()
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err := cli.Start()
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if err != nil {
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panic(err)
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}
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return proxy.NewAppConnConsensus(cli)
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}
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type mockProxyApp struct {
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abci.BaseApplication
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appHash []byte
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txCount int
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abciResponses *sm.ABCIResponses
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}
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func (mock *mockProxyApp) DeliverTx(tx []byte) abci.ResponseDeliverTx {
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r := mock.abciResponses.DeliverTx[mock.txCount]
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mock.txCount++
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return *r
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}
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func (mock *mockProxyApp) EndBlock(req abci.RequestEndBlock) abci.ResponseEndBlock {
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mock.txCount = 0
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return *mock.abciResponses.EndBlock
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}
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func (mock *mockProxyApp) Commit() abci.ResponseCommit {
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return abci.ResponseCommit{Data: mock.appHash}
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}
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