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package consensus
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"reflect"
"strconv"
"strings"
"time"
. "github.com/tendermint/go-common"
"github.com/tendermint/go-wire"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
// unmarshal and apply a single message to the consensus state
func (cs *ConsensusState) readReplayMessage(msgBytes []byte, newStepCh chan interface{}) error {
var err error
var msg ConsensusLogMessage
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("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("Proposal", "height", p.Height, "round", p.Round, "header",
p.BlockPartsHeader, "pol", p.POLRound, "peer", peerKey)
case *BlockPartMessage:
log.Notice("BlockPart", "height", msg.Height, "round", msg.Round, "peer", peerKey)
case *VoteMessage:
v := msg.Vote
log.Notice("Vote", "height", v.Height, "round", v.Round, "type", v.Type,
"hash", v.BlockHash, "header", v.BlockPartsHeader, "peer", peerKey)
}
// internal or from peer
if m.PeerKey == "" {
cs.internalMsgQueue <- m
} else {
cs.peerMsgQueue <- m
}
case timeoutInfo:
log.Notice("Timeout", "height", m.Height, "round", m.Round, "step", m.Step, "dur", m.Duration)
cs.tockChan <- m
default:
return fmt.Errorf("Unknown ConsensusLogMessage type: %v", reflect.TypeOf(msg.Msg))
}
return nil
}
// replay only those messages since the last block
func (cs *ConsensusState) catchupReplay(height int) error {
if cs.wal == nil {
log.Warn("consensus msg log is nil")
return nil
}
if !cs.wal.exists {
// new wal, nothing to catchup on
return nil
}
// starting from end of file,
// read messages until a new height is found
nLines, err := cs.wal.SeekFromEnd(func(lineBytes []byte) bool {
var err error
var msg ConsensusLogMessage
wire.ReadJSON(&msg, lineBytes, &err)
if err != nil {
panic(Fmt("Failed to read cs_msg_log json: %v", err))
}
m, ok := msg.Msg.(types.EventDataRoundState)
if ok && m.Step == RoundStepNewHeight.String() {
// TODO: ensure the height matches
return true
}
return false
})
if err != nil {
return err
}
var beginning bool // if we had to go back to the beginning
if c, _ := cs.wal.fp.Seek(0, 1); c == 0 {
beginning = true
}
log.Notice("Catchup by replaying consensus messages", "n", nLines)
// now we can replay the latest nLines on consensus state
// note we can't use scan because we've already been reading from the file
reader := bufio.NewReader(cs.wal.fp)
for i := 0; i < nLines; i++ {
msgBytes, err := reader.ReadBytes('\n')
if err == io.EOF {
break
} else if err != nil {
return err
} else if len(msgBytes) == 0 {
continue
} else if len(msgBytes) == 1 && msgBytes[0] == '\n' {
continue
}
// the first msg is (usually) the NewHeight event, so we can ignore it
if !beginning && i == 1 {
continue
}
// 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(msgBytes, nil); err != nil {
return err
}
}
log.Info("Done catchup replay")
return nil
}
//--------------------------------------------------------
// replay messages interactively or all at once
// Interactive playback
func (cs ConsensusState) ReplayConsole(file string) error {
return cs.replay(file, true)
}
// Full playback, with tests
func (cs ConsensusState) ReplayMessages(file string) error {
return cs.replay(file, false)
}
// replay all msgs or start the console
func (cs *ConsensusState) replay(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 := subscribeToEvent(cs.evsw, "replay-test", types.EventStringNewRoundStep(), 1)
// just open the file for reading, no need to use wal
fp, err := os.OpenFile(file, os.O_RDONLY, 0666)
if err != nil {
return err
}
pb := newPlayback(file, fp, cs, cs.state.Copy())
defer pb.fp.Close()
var nextN int // apply N msgs in a row
for pb.scanner.Scan() {
if nextN == 0 && console {
nextN = pb.replayConsoleLoop()
}
if err := pb.cs.readReplayMessage(pb.scanner.Bytes(), newStepCh); err != nil {
return err
}
if nextN > 0 {
nextN -= 1
}
pb.count += 1
}
return nil
}
//------------------------------------------------
// playback manager
type playback struct {
cs *ConsensusState
fp *os.File
scanner *bufio.Scanner
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,
scanner: bufio.NewScanner(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()
newCs := NewConsensusState(pb.genesisState.Copy(), pb.cs.proxyAppConn, pb.cs.blockStore, pb.cs.mempool)
newCs.SetEventSwitch(pb.cs.evsw)
newCs.startForReplay()
pb.fp.Close()
fp, err := os.OpenFile(pb.fileName, os.O_RDONLY, 0666)
if err != nil {
return err
}
pb.fp = fp
pb.scanner = bufio.NewScanner(fp)
count = pb.count - count
log.Notice(Fmt("Reseting from %d to %d", pb.count, count))
pb.count = 0
pb.cs = newCs
for i := 0; pb.scanner.Scan() && i < count; i++ {
if err := pb.cs.readReplayMessage(pb.scanner.Bytes(), newStepCh); err != nil {
return err
}
pb.count += 1
}
return nil
}
func (cs *ConsensusState) startForReplay() {
cs.BaseService.OnStart()
go cs.receiveRoutine(0)
// 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 {
Exit("input is too long")
} else if err != nil {
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
} else {
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
// ensure all new step events are regenerated as expected
newStepCh := subscribeToEvent(pb.cs.evsw, "replay-test", types.EventStringNewRoundStep(), 1)
if len(tokens) == 1 {
pb.replayReset(1, newStepCh)
} 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 {
pb.replayReset(i, newStepCh)
}
}
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
}