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376 lines
9.5 KiB
376 lines
9.5 KiB
package consensus
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"os"
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"reflect"
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"strconv"
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"strings"
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"time"
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auto "github.com/tendermint/go-autofile"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-wire"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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)
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// Unmarshal and apply a single message to the consensus state
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// as if it were received in receiveRoutine
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// Lines that start with "#" are ignored.
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// NOTE: receiveRoutine should not be running
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func (cs *ConsensusState) readReplayMessage(msgBytes []byte, newStepCh chan interface{}) error {
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// Skip over empty and meta lines
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if len(msgBytes) == 0 || msgBytes[0] == '#' {
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return nil
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}
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var err error
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var msg TimedWALMessage
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wire.ReadJSON(&msg, msgBytes, &err)
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if err != nil {
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fmt.Println("MsgBytes:", msgBytes, string(msgBytes))
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return fmt.Errorf("Error reading json data: %v", err)
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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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log.Notice("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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peerKey := m.PeerKey
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if peerKey == "" {
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peerKey = "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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log.Notice("Replay: Proposal", "height", p.Height, "round", p.Round, "header",
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p.BlockPartsHeader, "pol", p.POLRound, "peer", peerKey)
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case *BlockPartMessage:
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log.Notice("Replay: BlockPart", "height", msg.Height, "round", msg.Round, "peer", peerKey)
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case *VoteMessage:
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v := msg.Vote
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log.Notice("Replay: Vote", "height", v.Height, "round", v.Round, "type", v.Type,
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"blockID", v.BlockID, "peer", peerKey)
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}
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cs.handleMsg(m, cs.RoundState)
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case timeoutInfo:
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log.Notice("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.
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// timeoutRoutine should run concurrently to read off tickChan
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func (cs *ConsensusState) catchupReplay(csHeight int) error {
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// set replayMode
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cs.replayMode = true
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defer func() { cs.replayMode = false }()
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// Ensure that height+1 doesn't exist
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gr, found, err := cs.wal.group.Search("#HEIGHT: ", makeHeightSearchFunc(csHeight+1))
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if found {
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return errors.New(Fmt("WAL should not contain height %d.", csHeight+1))
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}
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if gr != nil {
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gr.Close()
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}
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// Search for height marker
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gr, found, err = cs.wal.group.Search("#HEIGHT: ", makeHeightSearchFunc(csHeight))
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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 !found {
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return errors.New(Fmt("WAL does not contain height %d.", csHeight))
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}
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defer gr.Close()
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log.Notice("Catchup by replaying consensus messages", "height", csHeight)
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for {
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line, err := gr.ReadLine()
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if err != nil {
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if err == io.EOF {
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break
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} else {
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return err
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}
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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([]byte(line), nil); err != nil {
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return err
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}
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}
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log.Notice("Replay: Done")
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return nil
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}
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//--------------------------------------------------------
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// replay messages interactively or all at once
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// Interactive playback
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func (cs ConsensusState) ReplayConsole(file string) error {
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return cs.replay(file, true)
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}
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// Full playback, with tests
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func (cs ConsensusState) ReplayMessages(file string) error {
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return cs.replay(file, false)
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}
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// replay all msgs or start the console
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func (cs *ConsensusState) replay(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 := subscribeToEvent(cs.evsw, "replay-test", types.EventStringNewRoundStep(), 1)
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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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for pb.scanner.Scan() {
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if nextN == 0 && console {
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nextN = pb.replayConsoleLoop()
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}
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if err := pb.cs.readReplayMessage(pb.scanner.Bytes(), 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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scanner *bufio.Scanner
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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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scanner: bufio.NewScanner(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.SetEventSwitch(pb.cs.evsw)
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newCS.startForReplay()
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pb.fp.Close()
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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.scanner = bufio.NewScanner(fp)
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count = pb.count - count
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log.Notice(Fmt("Reseting from %d to %d", pb.count, count))
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pb.count = 0
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pb.cs = newCS
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for i := 0; pb.scanner.Scan() && i < count; i++ {
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if err := pb.cs.readReplayMessage(pb.scanner.Bytes(), 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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// don't want to start full cs
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cs.BaseService.OnStart()
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// since we replay tocks we just ignore ticks
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// TODO:!
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/*
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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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Exit("input is too long")
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} else if err != nil {
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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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// ensure all new step events are regenerated as expected
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newStepCh := subscribeToEvent(pb.cs.evsw, "replay-test", types.EventStringNewRoundStep(), 1)
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if len(tokens) == 1 {
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pb.replayReset(1, newStepCh)
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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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pb.replayReset(i, newStepCh)
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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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// Parses marker lines of the form:
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// #HEIGHT: 12345
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func makeHeightSearchFunc(height int) 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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