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package consensus
import (
"bufio"
"context"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/pkg/errors"
bc "github.com/tendermint/tendermint/blockchain"
cfg "github.com/tendermint/tendermint/config"
cmn "github.com/tendermint/tendermint/libs/common"
dbm "github.com/tendermint/tendermint/libs/db"
"github.com/tendermint/tendermint/libs/log"
"github.com/tendermint/tendermint/proxy"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
const (
// event bus subscriber
subscriber = "replay-file"
)
//--------------------------------------------------------
// replay messages interactively or all at once
// replay the wal file
func RunReplayFile(config cfg.BaseConfig, csConfig *cfg.ConsensusConfig, console bool) {
consensusState := newConsensusStateForReplay(config, csConfig)
if err := consensusState.ReplayFile(csConfig.WalFile(), console); err != nil {
cmn.Exit(fmt.Sprintf("Error during consensus replay: %v", err))
}
}
// Replay msgs in file or start the console
func (cs *ConsensusState) ReplayFile(file string, console bool) error {
if cs.IsRunning() {
return errors.New("cs is already running, cannot replay")
}
if cs.wal != nil {
return errors.New("cs wal is open, cannot replay")
}
cs.startForReplay()
// ensure all new step events are regenerated as expected
newStepCh := make(chan interface{}, 1)
ctx := context.Background()
err := cs.eventBus.Subscribe(ctx, subscriber, types.EventQueryNewRoundStep, newStepCh)
if err != nil {
return errors.Errorf("failed to subscribe %s to %v", subscriber, types.EventQueryNewRoundStep)
}
defer func() {
// drain newStepCh to make sure we don't block
LOOP:
for {
select {
case <-newStepCh:
default:
break LOOP
}
}
cs.eventBus.Unsubscribe(ctx, subscriber, types.EventQueryNewRoundStep)
}()
// just open the file for reading, no need to use wal
fp, err := os.OpenFile(file, os.O_RDONLY, 0600)
if err != nil {
return err
}
pb := newPlayback(file, fp, cs, cs.state.Copy())
defer pb.fp.Close() // nolint: errcheck
var nextN int // apply N msgs in a row
var msg *TimedWALMessage
for {
if nextN == 0 && console {
nextN = pb.replayConsoleLoop()
}
msg, err = pb.dec.Decode()
if err == io.EOF {
return nil
} else if err != nil {
return err
}
if err := pb.cs.readReplayMessage(msg, newStepCh); err != nil {
return err
}
if nextN > 0 {
nextN--
}
pb.count++
}
return nil
}
//------------------------------------------------
// playback manager
type playback struct {
cs *ConsensusState
fp *os.File
dec *WALDecoder
count int // how many lines/msgs into the file are we
// replays can be reset to beginning
fileName string // so we can close/reopen the file
genesisState sm.State // so the replay session knows where to restart from
}
func newPlayback(fileName string, fp *os.File, cs *ConsensusState, genState sm.State) *playback {
return &playback{
cs: cs,
fp: fp,
fileName: fileName,
genesisState: genState,
dec: NewWALDecoder(fp),
}
}
// go back count steps by resetting the state and running (pb.count - count) steps
func (pb *playback) replayReset(count int, newStepCh chan interface{}) error {
pb.cs.Stop()
pb.cs.Wait()
newCS := NewConsensusState(pb.cs.config, pb.genesisState.Copy(), pb.cs.blockExec,
pb.cs.blockStore, pb.cs.mempool, pb.cs.evpool)
newCS.SetEventBus(pb.cs.eventBus)
newCS.startForReplay()
if err := pb.fp.Close(); err != nil {
return err
}
fp, err := os.OpenFile(pb.fileName, os.O_RDONLY, 0600)
if err != nil {
return err
}
pb.fp = fp
pb.dec = NewWALDecoder(fp)
count = pb.count - count
fmt.Printf("Reseting from %d to %d\n", pb.count, count)
pb.count = 0
pb.cs = newCS
var msg *TimedWALMessage
for i := 0; i < count; i++ {
msg, err = pb.dec.Decode()
if err == io.EOF {
return nil
} else if err != nil {
return err
}
if err := pb.cs.readReplayMessage(msg, newStepCh); err != nil {
return err
}
pb.count++
}
return nil
}
func (cs *ConsensusState) startForReplay() {
cs.Logger.Error("Replay commands are disabled until someone updates them and writes tests")
/* TODO:!
// since we replay tocks we just ignore ticks
go func() {
for {
select {
case <-cs.tickChan:
case <-cs.Quit:
return
}
}
}()*/
}
// console function for parsing input and running commands
func (pb *playback) replayConsoleLoop() int {
for {
fmt.Printf("> ")
bufReader := bufio.NewReader(os.Stdin)
line, more, err := bufReader.ReadLine()
if more {
cmn.Exit("input is too long")
} else if err != nil {
cmn.Exit(err.Error())
}
tokens := strings.Split(string(line), " ")
if len(tokens) == 0 {
continue
}
switch tokens[0] {
case "next":
// "next" -> replay next message
// "next N" -> replay next N messages
if len(tokens) == 1 {
return 0
}
i, err := strconv.Atoi(tokens[1])
if err != nil {
fmt.Println("next takes an integer argument")
} else {
return i
}
case "back":
// "back" -> go back one message
// "back N" -> go back N messages
// NOTE: "back" is not supported in the state machine design,
// so we restart and replay up to
ctx := context.Background()
// ensure all new step events are regenerated as expected
newStepCh := make(chan interface{}, 1)
err := pb.cs.eventBus.Subscribe(ctx, subscriber, types.EventQueryNewRoundStep, newStepCh)
if err != nil {
cmn.Exit(fmt.Sprintf("failed to subscribe %s to %v", subscriber, types.EventQueryNewRoundStep))
}
defer func() {
// drain newStepCh to make sure we don't block
LOOP:
for {
select {
case <-newStepCh:
default:
break LOOP
}
}
pb.cs.eventBus.Unsubscribe(ctx, subscriber, types.EventQueryNewRoundStep)
}()
if len(tokens) == 1 {
if err := pb.replayReset(1, newStepCh); err != nil {
pb.cs.Logger.Error("Replay reset error", "err", err)
}
} else {
i, err := strconv.Atoi(tokens[1])
if err != nil {
fmt.Println("back takes an integer argument")
} else if i > pb.count {
fmt.Printf("argument to back must not be larger than the current count (%d)\n", pb.count)
} else {
if err := pb.replayReset(i, newStepCh); err != nil {
pb.cs.Logger.Error("Replay reset error", "err", err)
}
}
}
case "rs":
// "rs" -> print entire round state
// "rs short" -> print height/round/step
// "rs <field>" -> print another field of the round state
rs := pb.cs.RoundState
if len(tokens) == 1 {
fmt.Println(rs)
} else {
switch tokens[1] {
case "short":
fmt.Printf("%v/%v/%v\n", rs.Height, rs.Round, rs.Step)
case "validators":
fmt.Println(rs.Validators)
case "proposal":
fmt.Println(rs.Proposal)
case "proposal_block":
fmt.Printf("%v %v\n", rs.ProposalBlockParts.StringShort(), rs.ProposalBlock.StringShort())
case "locked_round":
fmt.Println(rs.LockedRound)
case "locked_block":
fmt.Printf("%v %v\n", rs.LockedBlockParts.StringShort(), rs.LockedBlock.StringShort())
case "votes":
fmt.Println(rs.Votes.StringIndented(" "))
default:
fmt.Println("Unknown option", tokens[1])
}
}
case "n":
fmt.Println(pb.count)
}
}
return 0
}
//--------------------------------------------------------------------------------
// convenience for replay mode
func newConsensusStateForReplay(config cfg.BaseConfig, csConfig *cfg.ConsensusConfig) *ConsensusState {
dbType := dbm.DBBackendType(config.DBBackend)
// Get BlockStore
blockStoreDB := dbm.NewDB("blockstore", dbType, config.DBDir())
blockStore := bc.NewBlockStore(blockStoreDB)
// Get State
stateDB := dbm.NewDB("state", dbType, config.DBDir())
gdoc, err := sm.MakeGenesisDocFromFile(config.GenesisFile())
if err != nil {
cmn.Exit(err.Error())
}
state, err := sm.MakeGenesisState(gdoc)
if err != nil {
cmn.Exit(err.Error())
}
// Create proxyAppConn connection (consensus, mempool, query)
clientCreator := proxy.DefaultClientCreator(config.ProxyApp, config.ABCI, config.DBDir())
proxyApp := proxy.NewAppConns(clientCreator)
err = proxyApp.Start()
if err != nil {
cmn.Exit(fmt.Sprintf("Error starting proxy app conns: %v", err))
}
handshaker := NewHandshaker(stateDB, state, blockStore, gdoc)
err = handshaker.Handshake(proxyApp)
if err != nil {
cmn.Exit(fmt.Sprintf("Error on handshake: %v", err))
}
eventBus := types.NewEventBus()
if err := eventBus.Start(); err != nil {
cmn.Exit(fmt.Sprintf("Failed to start event bus: %v", err))
}
mempool, evpool := sm.MockMempool{}, sm.MockEvidencePool{}
blockExec := sm.NewBlockExecutor(stateDB, log.TestingLogger(), proxyApp.Consensus(), mempool, evpool)
consensusState := NewConsensusState(csConfig, state.Copy(), blockExec,
blockStore, mempool, evpool)
consensusState.SetEventBus(eventBus)
return consensusState
}