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309 lines
8.0 KiB
309 lines
8.0 KiB
package consensus
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/pkg/errors"
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bc "github.com/tendermint/tendermint/blockchain"
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cfg "github.com/tendermint/tendermint/config"
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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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cmn "github.com/tendermint/tmlibs/common"
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dbm "github.com/tendermint/tmlibs/db"
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)
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const (
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// event bus subscriber
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subscriber = "replay-file"
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)
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//--------------------------------------------------------
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// replay messages interactively or all at once
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func RunReplayFile(config cfg.BaseConfig, csConfig *cfg.ConsensusConfig, console bool) {
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consensusState := newConsensusStateForReplay(config, csConfig)
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if err := consensusState.ReplayFile(csConfig.WalFile(), console); err != nil {
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cmn.Exit(cmn.Fmt("Error during consensus replay: %v", err))
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}
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}
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// Replay msgs in file or start the console
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func (cs *ConsensusState) ReplayFile(file string, console bool) error {
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if cs.IsRunning() {
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return errors.New("cs is already running, cannot replay")
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}
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if cs.wal != nil {
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return errors.New("cs wal is open, cannot replay")
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}
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cs.startForReplay()
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// ensure all new step events are regenerated as expected
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newStepCh := make(chan interface{}, 1)
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ctx := context.Background()
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err := cs.eventBus.Subscribe(ctx, subscriber, types.EventQueryNewRoundStep, newStepCh)
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if err != nil {
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return errors.Errorf("failed to subscribe %s to %v", subscriber, types.EventQueryNewRoundStep)
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}
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defer cs.eventBus.Unsubscribe(ctx, subscriber, types.EventQueryNewRoundStep)
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// just open the file for reading, no need to use wal
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fp, err := os.OpenFile(file, os.O_RDONLY, 0666)
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if err != nil {
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return err
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}
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pb := newPlayback(file, fp, cs, cs.state.Copy())
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defer pb.fp.Close()
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var nextN int // apply N msgs in a row
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var msg *TimedWALMessage
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for {
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if nextN == 0 && console {
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nextN = pb.replayConsoleLoop()
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}
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msg, err = pb.dec.Decode()
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if err == io.EOF {
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return nil
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} else if err != nil {
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return err
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}
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if err := pb.cs.readReplayMessage(msg, newStepCh); err != nil {
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return err
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}
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if nextN > 0 {
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nextN -= 1
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}
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pb.count += 1
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}
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return nil
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}
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//------------------------------------------------
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// playback manager
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type playback struct {
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cs *ConsensusState
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fp *os.File
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dec *WALDecoder
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count int // how many lines/msgs into the file are we
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// replays can be reset to beginning
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fileName string // so we can close/reopen the file
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genesisState *sm.State // so the replay session knows where to restart from
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}
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func newPlayback(fileName string, fp *os.File, cs *ConsensusState, genState *sm.State) *playback {
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return &playback{
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cs: cs,
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fp: fp,
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fileName: fileName,
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genesisState: genState,
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dec: NewWALDecoder(fp),
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}
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}
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// go back count steps by resetting the state and running (pb.count - count) steps
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func (pb *playback) replayReset(count int, newStepCh chan interface{}) error {
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pb.cs.Stop()
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pb.cs.Wait()
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newCS := NewConsensusState(pb.cs.config, pb.genesisState.Copy(), pb.cs.proxyAppConn, pb.cs.blockStore, pb.cs.mempool)
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newCS.SetEventBus(pb.cs.eventBus)
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newCS.startForReplay()
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if err := pb.fp.Close(); err != nil {
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return err
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}
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fp, err := os.OpenFile(pb.fileName, os.O_RDONLY, 0666)
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if err != nil {
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return err
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}
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pb.fp = fp
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pb.dec = NewWALDecoder(fp)
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count = pb.count - count
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fmt.Printf("Reseting from %d to %d\n", pb.count, count)
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pb.count = 0
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pb.cs = newCS
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var msg *TimedWALMessage
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for i := 0; i < count; i++ {
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msg, err = pb.dec.Decode()
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if err == io.EOF {
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return nil
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} else if err != nil {
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return err
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}
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if err := pb.cs.readReplayMessage(msg, newStepCh); err != nil {
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return err
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}
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pb.count += 1
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}
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return nil
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}
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func (cs *ConsensusState) startForReplay() {
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cs.Logger.Error("Replay commands are disabled until someone updates them and writes tests")
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/* TODO:!
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// since we replay tocks we just ignore ticks
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go func() {
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for {
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select {
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case <-cs.tickChan:
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case <-cs.Quit:
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return
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}
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}
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}()*/
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}
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// console function for parsing input and running commands
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func (pb *playback) replayConsoleLoop() int {
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for {
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fmt.Printf("> ")
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bufReader := bufio.NewReader(os.Stdin)
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line, more, err := bufReader.ReadLine()
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if more {
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cmn.Exit("input is too long")
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} else if err != nil {
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cmn.Exit(err.Error())
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}
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tokens := strings.Split(string(line), " ")
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if len(tokens) == 0 {
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continue
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}
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switch tokens[0] {
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case "next":
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// "next" -> replay next message
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// "next N" -> replay next N messages
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if len(tokens) == 1 {
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return 0
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} else {
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i, err := strconv.Atoi(tokens[1])
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if err != nil {
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fmt.Println("next takes an integer argument")
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} else {
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return i
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}
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}
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case "back":
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// "back" -> go back one message
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// "back N" -> go back N messages
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// NOTE: "back" is not supported in the state machine design,
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// so we restart and replay up to
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ctx := context.Background()
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// ensure all new step events are regenerated as expected
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newStepCh := make(chan interface{}, 1)
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err := pb.cs.eventBus.Subscribe(ctx, subscriber, types.EventQueryNewRoundStep, newStepCh)
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if err != nil {
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cmn.Exit(fmt.Sprintf("failed to subscribe %s to %v", subscriber, types.EventQueryNewRoundStep))
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}
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defer pb.cs.eventBus.Unsubscribe(ctx, subscriber, types.EventQueryNewRoundStep)
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if len(tokens) == 1 {
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if err := pb.replayReset(1, newStepCh); err != nil {
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pb.cs.Logger.Error("Replay reset error", "err", err)
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}
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} else {
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i, err := strconv.Atoi(tokens[1])
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if err != nil {
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fmt.Println("back takes an integer argument")
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} else if i > pb.count {
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fmt.Printf("argument to back must not be larger than the current count (%d)\n", pb.count)
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} else {
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if err := pb.replayReset(i, newStepCh); err != nil {
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pb.cs.Logger.Error("Replay reset error", "err", err)
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}
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}
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}
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case "rs":
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// "rs" -> print entire round state
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// "rs short" -> print height/round/step
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// "rs <field>" -> print another field of the round state
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rs := pb.cs.RoundState
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if len(tokens) == 1 {
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fmt.Println(rs)
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} else {
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switch tokens[1] {
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case "short":
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fmt.Printf("%v/%v/%v\n", rs.Height, rs.Round, rs.Step)
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case "validators":
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fmt.Println(rs.Validators)
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case "proposal":
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fmt.Println(rs.Proposal)
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case "proposal_block":
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fmt.Printf("%v %v\n", rs.ProposalBlockParts.StringShort(), rs.ProposalBlock.StringShort())
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case "locked_round":
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fmt.Println(rs.LockedRound)
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case "locked_block":
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fmt.Printf("%v %v\n", rs.LockedBlockParts.StringShort(), rs.LockedBlock.StringShort())
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case "votes":
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fmt.Println(rs.Votes.StringIndented(" "))
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default:
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fmt.Println("Unknown option", tokens[1])
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}
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}
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case "n":
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fmt.Println(pb.count)
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}
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}
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return 0
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}
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//--------------------------------------------------------------------------------
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// convenience for replay mode
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func newConsensusStateForReplay(config cfg.BaseConfig, csConfig *cfg.ConsensusConfig) *ConsensusState {
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// Get BlockStore
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blockStoreDB := dbm.NewDB("blockstore", config.DBBackend, config.DBDir())
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blockStore := bc.NewBlockStore(blockStoreDB)
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// Get State
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stateDB := dbm.NewDB("state", config.DBBackend, config.DBDir())
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state, err := sm.MakeGenesisStateFromFile(stateDB, config.GenesisFile())
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if err != nil {
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cmn.Exit(err.Error())
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}
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// Create proxyAppConn connection (consensus, mempool, query)
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clientCreator := proxy.DefaultClientCreator(config.ProxyApp, config.ABCI, config.DBDir())
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proxyApp := proxy.NewAppConns(clientCreator, NewHandshaker(state, blockStore))
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_, err = proxyApp.Start()
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if err != nil {
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cmn.Exit(cmn.Fmt("Error starting proxy app conns: %v", err))
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}
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eventBus := types.NewEventBus()
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if _, err := eventBus.Start(); err != nil {
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cmn.Exit(cmn.Fmt("Failed to start event bus: %v", err))
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}
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consensusState := NewConsensusState(csConfig, state.Copy(), proxyApp.Consensus(), blockStore, types.MockMempool{})
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consensusState.SetEventBus(eventBus)
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return consensusState
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}
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