You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
416 lines
13 KiB
416 lines
13 KiB
package consensus
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"reflect"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/spf13/viper"
|
|
|
|
abci "github.com/tendermint/abci/types"
|
|
"github.com/tendermint/go-wire"
|
|
auto "github.com/tendermint/tmlibs/autofile"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
|
|
"github.com/tendermint/tendermint/proxy"
|
|
sm "github.com/tendermint/tendermint/state"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
// Functionality to replay blocks and messages on recovery from a crash.
|
|
// There are two general failure scenarios: failure during consensus, and failure while applying the block.
|
|
// The former is handled by the WAL, the latter by the proxyApp Handshake on restart,
|
|
// which ultimately hands off the work to the WAL.
|
|
|
|
//-----------------------------------------
|
|
// recover from failure during consensus
|
|
// by replaying messages from the WAL
|
|
|
|
// Unmarshal and apply a single message to the consensus state
|
|
// as if it were received in receiveRoutine
|
|
// Lines that start with "#" are ignored.
|
|
// NOTE: receiveRoutine should not be running
|
|
func (cs *ConsensusState) readReplayMessage(msgBytes []byte, newStepCh chan interface{}) error {
|
|
// Skip over empty and meta lines
|
|
if len(msgBytes) == 0 || msgBytes[0] == '#' {
|
|
return nil
|
|
}
|
|
var err error
|
|
var msg TimedWALMessage
|
|
wire.ReadJSON(&msg, msgBytes, &err)
|
|
if err != nil {
|
|
fmt.Println("MsgBytes:", msgBytes, string(msgBytes))
|
|
return fmt.Errorf("Error reading json data: %v", err)
|
|
}
|
|
|
|
// for logging
|
|
switch m := msg.Msg.(type) {
|
|
case types.EventDataRoundState:
|
|
log.Notice("Replay: New Step", "height", m.Height, "round", m.Round, "step", m.Step)
|
|
// these are playback checks
|
|
ticker := time.After(time.Second * 2)
|
|
if newStepCh != nil {
|
|
select {
|
|
case mi := <-newStepCh:
|
|
m2 := mi.(types.EventDataRoundState)
|
|
if m.Height != m2.Height || m.Round != m2.Round || m.Step != m2.Step {
|
|
return fmt.Errorf("RoundState mismatch. Got %v; Expected %v", m2, m)
|
|
}
|
|
case <-ticker:
|
|
return fmt.Errorf("Failed to read off newStepCh")
|
|
}
|
|
}
|
|
case msgInfo:
|
|
peerKey := m.PeerKey
|
|
if peerKey == "" {
|
|
peerKey = "local"
|
|
}
|
|
switch msg := m.Msg.(type) {
|
|
case *ProposalMessage:
|
|
p := msg.Proposal
|
|
log.Notice("Replay: Proposal", "height", p.Height, "round", p.Round, "header",
|
|
p.BlockPartsHeader, "pol", p.POLRound, "peer", peerKey)
|
|
case *BlockPartMessage:
|
|
log.Notice("Replay: BlockPart", "height", msg.Height, "round", msg.Round, "peer", peerKey)
|
|
case *VoteMessage:
|
|
v := msg.Vote
|
|
log.Notice("Replay: Vote", "height", v.Height, "round", v.Round, "type", v.Type,
|
|
"blockID", v.BlockID, "peer", peerKey)
|
|
}
|
|
|
|
cs.handleMsg(m, cs.RoundState)
|
|
case timeoutInfo:
|
|
log.Notice("Replay: Timeout", "height", m.Height, "round", m.Round, "step", m.Step, "dur", m.Duration)
|
|
cs.handleTimeout(m, cs.RoundState)
|
|
default:
|
|
return fmt.Errorf("Replay: Unknown TimedWALMessage type: %v", reflect.TypeOf(msg.Msg))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// replay only those messages since the last block.
|
|
// timeoutRoutine should run concurrently to read off tickChan
|
|
func (cs *ConsensusState) catchupReplay(csHeight int) error {
|
|
|
|
// set replayMode
|
|
cs.replayMode = true
|
|
defer func() { cs.replayMode = false }()
|
|
|
|
// Ensure that ENDHEIGHT for this height doesn't exist
|
|
// NOTE: This is just a sanity check. As far as we know things work fine without it,
|
|
// and Handshake could reuse ConsensusState if it weren't for this check (since we can crash after writing ENDHEIGHT).
|
|
gr, found, err := cs.wal.group.Search("#ENDHEIGHT: ", makeHeightSearchFunc(csHeight))
|
|
if gr != nil {
|
|
gr.Close()
|
|
}
|
|
if found {
|
|
return errors.New(cmn.Fmt("WAL should not contain #ENDHEIGHT %d.", csHeight))
|
|
}
|
|
|
|
// Search for last height marker
|
|
gr, found, err = cs.wal.group.Search("#ENDHEIGHT: ", makeHeightSearchFunc(csHeight-1))
|
|
if err == io.EOF {
|
|
log.Warn("Replay: wal.group.Search returned EOF", "#ENDHEIGHT", csHeight-1)
|
|
// if we upgraded from 0.9 to 0.9.1, we may have #HEIGHT instead
|
|
// TODO (0.10.0): remove this
|
|
gr, found, err = cs.wal.group.Search("#HEIGHT: ", makeHeightSearchFunc(csHeight))
|
|
if err == io.EOF {
|
|
log.Warn("Replay: wal.group.Search returned EOF", "#HEIGHT", csHeight)
|
|
return nil
|
|
} else if err != nil {
|
|
return err
|
|
}
|
|
} else if err != nil {
|
|
return err
|
|
} else {
|
|
defer gr.Close()
|
|
}
|
|
if !found {
|
|
// if we upgraded from 0.9 to 0.9.1, we may have #HEIGHT instead
|
|
// TODO (0.10.0): remove this
|
|
gr, found, err = cs.wal.group.Search("#HEIGHT: ", makeHeightSearchFunc(csHeight))
|
|
if err == io.EOF {
|
|
log.Warn("Replay: wal.group.Search returned EOF", "#HEIGHT", csHeight)
|
|
return nil
|
|
} else if err != nil {
|
|
return err
|
|
} else {
|
|
defer gr.Close()
|
|
}
|
|
|
|
// TODO (0.10.0): uncomment
|
|
// return errors.New(cmn.Fmt("Cannot replay height %d. WAL does not contain #ENDHEIGHT for %d.", csHeight, csHeight-1))
|
|
}
|
|
|
|
log.Notice("Catchup by replaying consensus messages", "height", csHeight)
|
|
|
|
for {
|
|
line, err := gr.ReadLine()
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
break
|
|
} else {
|
|
return err
|
|
}
|
|
}
|
|
// NOTE: since the priv key is set when the msgs are received
|
|
// it will attempt to eg double sign but we can just ignore it
|
|
// since the votes will be replayed and we'll get to the next step
|
|
if err := cs.readReplayMessage([]byte(line), nil); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
log.Notice("Replay: Done")
|
|
return nil
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
|
|
// Parses marker lines of the form:
|
|
// #ENDHEIGHT: 12345
|
|
func makeHeightSearchFunc(height int) auto.SearchFunc {
|
|
return func(line string) (int, error) {
|
|
line = strings.TrimRight(line, "\n")
|
|
parts := strings.Split(line, " ")
|
|
if len(parts) != 2 {
|
|
return -1, errors.New("Line did not have 2 parts")
|
|
}
|
|
i, err := strconv.Atoi(parts[1])
|
|
if err != nil {
|
|
return -1, errors.New("Failed to parse INFO: " + err.Error())
|
|
}
|
|
if height < i {
|
|
return 1, nil
|
|
} else if height == i {
|
|
return 0, nil
|
|
} else {
|
|
return -1, nil
|
|
}
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------
|
|
// Recover from failure during block processing
|
|
// by handshaking with the app to figure out where
|
|
// we were last and using the WAL to recover there
|
|
|
|
type Handshaker struct {
|
|
config *viper.Viper
|
|
state *sm.State
|
|
store types.BlockStore
|
|
|
|
nBlocks int // number of blocks applied to the state
|
|
}
|
|
|
|
func NewHandshaker(config *viper.Viper, state *sm.State, store types.BlockStore) *Handshaker {
|
|
return &Handshaker{config, state, store, 0}
|
|
}
|
|
|
|
func (h *Handshaker) NBlocks() int {
|
|
return h.nBlocks
|
|
}
|
|
|
|
// TODO: retry the handshake/replay if it fails ?
|
|
func (h *Handshaker) Handshake(proxyApp proxy.AppConns) error {
|
|
// handshake is done via info request on the query conn
|
|
res, err := proxyApp.Query().InfoSync()
|
|
if err != nil {
|
|
return errors.New(cmn.Fmt("Error calling Info: %v", err))
|
|
}
|
|
|
|
blockHeight := int(res.LastBlockHeight) // XXX: beware overflow
|
|
appHash := res.LastBlockAppHash
|
|
|
|
log.Notice("ABCI Handshake", "appHeight", blockHeight, "appHash", appHash)
|
|
|
|
// TODO: check version
|
|
|
|
// replay blocks up to the latest in the blockstore
|
|
_, err = h.ReplayBlocks(appHash, blockHeight, proxyApp)
|
|
if err != nil {
|
|
return errors.New(cmn.Fmt("Error on replay: %v", err))
|
|
}
|
|
|
|
log.Notice("Completed ABCI Handshake - Tendermint and App are synced", "appHeight", blockHeight, "appHash", appHash)
|
|
|
|
// TODO: (on restart) replay mempool
|
|
|
|
return nil
|
|
}
|
|
|
|
// Replay all blocks since appBlockHeight and ensure the result matches the current state.
|
|
// Returns the final AppHash or an error
|
|
func (h *Handshaker) ReplayBlocks(appHash []byte, appBlockHeight int, proxyApp proxy.AppConns) ([]byte, error) {
|
|
|
|
storeBlockHeight := h.store.Height()
|
|
stateBlockHeight := h.state.LastBlockHeight
|
|
log.Notice("ABCI Replay Blocks", "appHeight", appBlockHeight, "storeHeight", storeBlockHeight, "stateHeight", stateBlockHeight)
|
|
|
|
// If appBlockHeight == 0 it means that we are at genesis and hence should send InitChain
|
|
if appBlockHeight == 0 {
|
|
validators := types.TM2PB.Validators(h.state.Validators)
|
|
proxyApp.Consensus().InitChainSync(validators)
|
|
}
|
|
|
|
// First handle edge cases and constraints on the storeBlockHeight
|
|
if storeBlockHeight == 0 {
|
|
return appHash, h.checkAppHash(appHash)
|
|
|
|
} else if storeBlockHeight < appBlockHeight {
|
|
// the app should never be ahead of the store (but this is under app's control)
|
|
return appHash, sm.ErrAppBlockHeightTooHigh{storeBlockHeight, appBlockHeight}
|
|
|
|
} else if storeBlockHeight < stateBlockHeight {
|
|
// the state should never be ahead of the store (this is under tendermint's control)
|
|
cmn.PanicSanity(cmn.Fmt("StateBlockHeight (%d) > StoreBlockHeight (%d)", stateBlockHeight, storeBlockHeight))
|
|
|
|
} else if storeBlockHeight > stateBlockHeight+1 {
|
|
// store should be at most one ahead of the state (this is under tendermint's control)
|
|
cmn.PanicSanity(cmn.Fmt("StoreBlockHeight (%d) > StateBlockHeight + 1 (%d)", storeBlockHeight, stateBlockHeight+1))
|
|
}
|
|
|
|
// Now either store is equal to state, or one ahead.
|
|
// For each, consider all cases of where the app could be, given app <= store
|
|
if storeBlockHeight == stateBlockHeight {
|
|
// Tendermint ran Commit and saved the state.
|
|
// Either the app is asking for replay, or we're all synced up.
|
|
if appBlockHeight < storeBlockHeight {
|
|
// the app is behind, so replay blocks, but no need to go through WAL (state is already synced to store)
|
|
return h.replayBlocks(proxyApp, appBlockHeight, storeBlockHeight, false)
|
|
|
|
} else if appBlockHeight == storeBlockHeight {
|
|
// We're good!
|
|
return appHash, h.checkAppHash(appHash)
|
|
}
|
|
|
|
} else if storeBlockHeight == stateBlockHeight+1 {
|
|
// We saved the block in the store but haven't updated the state,
|
|
// so we'll need to replay a block using the WAL.
|
|
if appBlockHeight < stateBlockHeight {
|
|
// the app is further behind than it should be, so replay blocks
|
|
// but leave the last block to go through the WAL
|
|
return h.replayBlocks(proxyApp, appBlockHeight, storeBlockHeight, true)
|
|
|
|
} else if appBlockHeight == stateBlockHeight {
|
|
// We haven't run Commit (both the state and app are one block behind),
|
|
// so replayBlock with the real app.
|
|
// NOTE: We could instead use the cs.WAL on cs.Start,
|
|
// but we'd have to allow the WAL to replay a block that wrote it's ENDHEIGHT
|
|
log.Info("Replay last block using real app")
|
|
return h.replayBlock(storeBlockHeight, proxyApp.Consensus())
|
|
|
|
} else if appBlockHeight == storeBlockHeight {
|
|
// We ran Commit, but didn't save the state, so replayBlock with mock app
|
|
abciResponses := h.state.LoadABCIResponses()
|
|
mockApp := newMockProxyApp(appHash, abciResponses)
|
|
log.Info("Replay last block using mock app")
|
|
return h.replayBlock(storeBlockHeight, mockApp)
|
|
}
|
|
|
|
}
|
|
|
|
cmn.PanicSanity("Should never happen")
|
|
return nil, nil
|
|
}
|
|
|
|
func (h *Handshaker) replayBlocks(proxyApp proxy.AppConns, appBlockHeight, storeBlockHeight int, mutateState bool) ([]byte, error) {
|
|
// App is further behind than it should be, so we need to replay blocks.
|
|
// We replay all blocks from appBlockHeight+1.
|
|
// Note that we don't have an old version of the state,
|
|
// so we by-pass state validation/mutation using sm.ExecCommitBlock.
|
|
// If mutateState == true, the final block is replayed with h.replayBlock()
|
|
|
|
var appHash []byte
|
|
var err error
|
|
finalBlock := storeBlockHeight
|
|
if mutateState {
|
|
finalBlock -= 1
|
|
}
|
|
for i := appBlockHeight + 1; i <= finalBlock; i++ {
|
|
log.Info("Applying block", "height", i)
|
|
block := h.store.LoadBlock(i)
|
|
appHash, err = sm.ExecCommitBlock(proxyApp.Consensus(), block)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
h.nBlocks += 1
|
|
}
|
|
|
|
if mutateState {
|
|
// sync the final block
|
|
return h.replayBlock(storeBlockHeight, proxyApp.Consensus())
|
|
}
|
|
|
|
return appHash, h.checkAppHash(appHash)
|
|
}
|
|
|
|
// ApplyBlock on the proxyApp with the last block.
|
|
func (h *Handshaker) replayBlock(height int, proxyApp proxy.AppConnConsensus) ([]byte, error) {
|
|
mempool := types.MockMempool{}
|
|
|
|
var eventCache types.Fireable // nil
|
|
block := h.store.LoadBlock(height)
|
|
meta := h.store.LoadBlockMeta(height)
|
|
|
|
if err := h.state.ApplyBlock(eventCache, proxyApp, block, meta.BlockID.PartsHeader, mempool); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
h.nBlocks += 1
|
|
|
|
return h.state.AppHash, nil
|
|
}
|
|
|
|
func (h *Handshaker) checkAppHash(appHash []byte) error {
|
|
if !bytes.Equal(h.state.AppHash, appHash) {
|
|
panic(errors.New(cmn.Fmt("Tendermint state.AppHash does not match AppHash after replay. Got %X, expected %X", appHash, h.state.AppHash)).Error())
|
|
return nil
|
|
}
|
|
return nil
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
// mockProxyApp uses ABCIResponses to give the right results
|
|
// Useful because we don't want to call Commit() twice for the same block on the real app.
|
|
|
|
func newMockProxyApp(appHash []byte, abciResponses *sm.ABCIResponses) proxy.AppConnConsensus {
|
|
clientCreator := proxy.NewLocalClientCreator(&mockProxyApp{
|
|
appHash: appHash,
|
|
abciResponses: abciResponses,
|
|
})
|
|
cli, _ := clientCreator.NewABCIClient()
|
|
return proxy.NewAppConnConsensus(cli)
|
|
}
|
|
|
|
type mockProxyApp struct {
|
|
abci.BaseApplication
|
|
|
|
appHash []byte
|
|
txCount int
|
|
abciResponses *sm.ABCIResponses
|
|
}
|
|
|
|
func (mock *mockProxyApp) DeliverTx(tx []byte) abci.Result {
|
|
r := mock.abciResponses.DeliverTx[mock.txCount]
|
|
mock.txCount += 1
|
|
return abci.Result{
|
|
r.Code,
|
|
r.Data,
|
|
r.Log,
|
|
}
|
|
}
|
|
|
|
func (mock *mockProxyApp) EndBlock(height uint64) abci.ResponseEndBlock {
|
|
mock.txCount = 0
|
|
return mock.abciResponses.EndBlock
|
|
}
|
|
|
|
func (mock *mockProxyApp) Commit() abci.Result {
|
|
return abci.NewResultOK(mock.appHash, "")
|
|
}
|