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.
433 lines
12 KiB
433 lines
12 KiB
package consensus
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"errors"
|
|
"fmt"
|
|
"hash/crc32"
|
|
"io"
|
|
"path/filepath"
|
|
"time"
|
|
|
|
"github.com/gogo/protobuf/proto"
|
|
|
|
auto "github.com/tendermint/tendermint/internal/libs/autofile"
|
|
tmjson "github.com/tendermint/tendermint/libs/json"
|
|
"github.com/tendermint/tendermint/libs/log"
|
|
tmos "github.com/tendermint/tendermint/libs/os"
|
|
"github.com/tendermint/tendermint/libs/service"
|
|
tmtime "github.com/tendermint/tendermint/libs/time"
|
|
tmcons "github.com/tendermint/tendermint/proto/tendermint/consensus"
|
|
)
|
|
|
|
const (
|
|
// time.Time + max consensus msg size
|
|
maxMsgSizeBytes = maxMsgSize + 24
|
|
|
|
// how often the WAL should be sync'd during period sync'ing
|
|
walDefaultFlushInterval = 2 * time.Second
|
|
)
|
|
|
|
//--------------------------------------------------------
|
|
// types and functions for savings consensus messages
|
|
|
|
// TimedWALMessage wraps WALMessage and adds Time for debugging purposes.
|
|
type TimedWALMessage struct {
|
|
Time time.Time `json:"time"`
|
|
Msg WALMessage `json:"msg"`
|
|
}
|
|
|
|
// EndHeightMessage marks the end of the given height inside WAL.
|
|
// @internal used by scripts/wal2json util.
|
|
type EndHeightMessage struct {
|
|
Height int64 `json:"height"`
|
|
}
|
|
|
|
type WALMessage interface{}
|
|
|
|
func init() {
|
|
tmjson.RegisterType(msgInfo{}, "tendermint/wal/MsgInfo")
|
|
tmjson.RegisterType(timeoutInfo{}, "tendermint/wal/TimeoutInfo")
|
|
tmjson.RegisterType(EndHeightMessage{}, "tendermint/wal/EndHeightMessage")
|
|
}
|
|
|
|
//--------------------------------------------------------
|
|
// Simple write-ahead logger
|
|
|
|
// WAL is an interface for any write-ahead logger.
|
|
type WAL interface {
|
|
Write(WALMessage) error
|
|
WriteSync(WALMessage) error
|
|
FlushAndSync() error
|
|
|
|
SearchForEndHeight(height int64, options *WALSearchOptions) (rd io.ReadCloser, found bool, err error)
|
|
|
|
// service methods
|
|
Start() error
|
|
Stop() error
|
|
Wait()
|
|
}
|
|
|
|
// Write ahead logger writes msgs to disk before they are processed.
|
|
// Can be used for crash-recovery and deterministic replay.
|
|
// TODO: currently the wal is overwritten during replay catchup, give it a mode
|
|
// so it's either reading or appending - must read to end to start appending
|
|
// again.
|
|
type BaseWAL struct {
|
|
service.BaseService
|
|
|
|
group *auto.Group
|
|
|
|
enc *WALEncoder
|
|
|
|
flushTicker *time.Ticker
|
|
flushInterval time.Duration
|
|
}
|
|
|
|
var _ WAL = &BaseWAL{}
|
|
|
|
// NewWAL returns a new write-ahead logger based on `baseWAL`, which implements
|
|
// WAL. It's flushed and synced to disk every 2s and once when stopped.
|
|
func NewWAL(walFile string, groupOptions ...func(*auto.Group)) (*BaseWAL, error) {
|
|
err := tmos.EnsureDir(filepath.Dir(walFile), 0700)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to ensure WAL directory is in place: %w", err)
|
|
}
|
|
|
|
group, err := auto.OpenGroup(walFile, groupOptions...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
wal := &BaseWAL{
|
|
group: group,
|
|
enc: NewWALEncoder(group),
|
|
flushInterval: walDefaultFlushInterval,
|
|
}
|
|
wal.BaseService = *service.NewBaseService(nil, "baseWAL", wal)
|
|
return wal, nil
|
|
}
|
|
|
|
// SetFlushInterval allows us to override the periodic flush interval for the WAL.
|
|
func (wal *BaseWAL) SetFlushInterval(i time.Duration) {
|
|
wal.flushInterval = i
|
|
}
|
|
|
|
func (wal *BaseWAL) Group() *auto.Group {
|
|
return wal.group
|
|
}
|
|
|
|
func (wal *BaseWAL) SetLogger(l log.Logger) {
|
|
wal.BaseService.Logger = l
|
|
wal.group.SetLogger(l)
|
|
}
|
|
|
|
func (wal *BaseWAL) OnStart() error {
|
|
size, err := wal.group.Head.Size()
|
|
if err != nil {
|
|
return err
|
|
} else if size == 0 {
|
|
if err := wal.WriteSync(EndHeightMessage{0}); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
err = wal.group.Start()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
wal.flushTicker = time.NewTicker(wal.flushInterval)
|
|
go wal.processFlushTicks()
|
|
return nil
|
|
}
|
|
|
|
func (wal *BaseWAL) processFlushTicks() {
|
|
for {
|
|
select {
|
|
case <-wal.flushTicker.C:
|
|
if err := wal.FlushAndSync(); err != nil {
|
|
wal.Logger.Error("Periodic WAL flush failed", "err", err)
|
|
}
|
|
case <-wal.Quit():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// FlushAndSync flushes and fsync's the underlying group's data to disk.
|
|
// See auto#FlushAndSync
|
|
func (wal *BaseWAL) FlushAndSync() error {
|
|
return wal.group.FlushAndSync()
|
|
}
|
|
|
|
// Stop the underlying autofile group.
|
|
// Use Wait() to ensure it's finished shutting down
|
|
// before cleaning up files.
|
|
func (wal *BaseWAL) OnStop() {
|
|
wal.flushTicker.Stop()
|
|
if err := wal.FlushAndSync(); err != nil {
|
|
wal.Logger.Error("error on flush data to disk", "error", err)
|
|
}
|
|
if err := wal.group.Stop(); err != nil {
|
|
wal.Logger.Error("error trying to stop wal", "error", err)
|
|
}
|
|
wal.group.Close()
|
|
}
|
|
|
|
// Wait for the underlying autofile group to finish shutting down
|
|
// so it's safe to cleanup files.
|
|
func (wal *BaseWAL) Wait() {
|
|
wal.group.Wait()
|
|
}
|
|
|
|
// Write is called in newStep and for each receive on the
|
|
// peerMsgQueue and the timeoutTicker.
|
|
// NOTE: does not call fsync()
|
|
func (wal *BaseWAL) Write(msg WALMessage) error {
|
|
if wal == nil {
|
|
return nil
|
|
}
|
|
|
|
if err := wal.enc.Encode(&TimedWALMessage{tmtime.Now(), msg}); err != nil {
|
|
wal.Logger.Error("Error writing msg to consensus wal. WARNING: recover may not be possible for the current height",
|
|
"err", err, "msg", msg)
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// WriteSync is called when we receive a msg from ourselves
|
|
// so that we write to disk before sending signed messages.
|
|
// NOTE: calls fsync()
|
|
func (wal *BaseWAL) WriteSync(msg WALMessage) error {
|
|
if wal == nil {
|
|
return nil
|
|
}
|
|
|
|
if err := wal.Write(msg); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := wal.FlushAndSync(); err != nil {
|
|
wal.Logger.Error(`WriteSync failed to flush consensus wal.
|
|
WARNING: may result in creating alternative proposals / votes for the current height iff the node restarted`,
|
|
"err", err)
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// WALSearchOptions are optional arguments to SearchForEndHeight.
|
|
type WALSearchOptions struct {
|
|
// IgnoreDataCorruptionErrors set to true will result in skipping data corruption errors.
|
|
IgnoreDataCorruptionErrors bool
|
|
}
|
|
|
|
// SearchForEndHeight searches for the EndHeightMessage with the given height
|
|
// and returns an auto.GroupReader, whenever it was found or not and an error.
|
|
// Group reader will be nil if found equals false.
|
|
//
|
|
// CONTRACT: caller must close group reader.
|
|
func (wal *BaseWAL) SearchForEndHeight(
|
|
height int64,
|
|
options *WALSearchOptions) (rd io.ReadCloser, found bool, err error) {
|
|
var (
|
|
msg *TimedWALMessage
|
|
gr *auto.GroupReader
|
|
)
|
|
lastHeightFound := int64(-1)
|
|
|
|
// NOTE: starting from the last file in the group because we're usually
|
|
// searching for the last height. See replay.go
|
|
min, max := wal.group.MinIndex(), wal.group.MaxIndex()
|
|
wal.Logger.Info("Searching for height", "height", height, "min", min, "max", max)
|
|
for index := max; index >= min; index-- {
|
|
gr, err = wal.group.NewReader(index)
|
|
if err != nil {
|
|
return nil, false, err
|
|
}
|
|
|
|
dec := NewWALDecoder(gr)
|
|
for {
|
|
msg, err = dec.Decode()
|
|
if err == io.EOF {
|
|
// OPTIMISATION: no need to look for height in older files if we've seen h < height
|
|
if lastHeightFound > 0 && lastHeightFound < height {
|
|
gr.Close()
|
|
return nil, false, nil
|
|
}
|
|
// check next file
|
|
break
|
|
}
|
|
if options.IgnoreDataCorruptionErrors && IsDataCorruptionError(err) {
|
|
wal.Logger.Error("Corrupted entry. Skipping...", "err", err)
|
|
// do nothing
|
|
continue
|
|
} else if err != nil {
|
|
gr.Close()
|
|
return nil, false, err
|
|
}
|
|
|
|
if m, ok := msg.Msg.(EndHeightMessage); ok {
|
|
lastHeightFound = m.Height
|
|
if m.Height == height { // found
|
|
wal.Logger.Info("Found", "height", height, "index", index)
|
|
return gr, true, nil
|
|
}
|
|
}
|
|
}
|
|
gr.Close()
|
|
}
|
|
|
|
return nil, false, nil
|
|
}
|
|
|
|
// A WALEncoder writes custom-encoded WAL messages to an output stream.
|
|
//
|
|
// Format: 4 bytes CRC sum + 4 bytes length + arbitrary-length value
|
|
type WALEncoder struct {
|
|
wr io.Writer
|
|
}
|
|
|
|
// NewWALEncoder returns a new encoder that writes to wr.
|
|
func NewWALEncoder(wr io.Writer) *WALEncoder {
|
|
return &WALEncoder{wr}
|
|
}
|
|
|
|
// Encode writes the custom encoding of v to the stream. It returns an error if
|
|
// the encoded size of v is greater than 1MB. Any error encountered
|
|
// during the write is also returned.
|
|
func (enc *WALEncoder) Encode(v *TimedWALMessage) error {
|
|
pbMsg, err := WALToProto(v.Msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
pv := tmcons.TimedWALMessage{
|
|
Time: v.Time,
|
|
Msg: pbMsg,
|
|
}
|
|
|
|
data, err := proto.Marshal(&pv)
|
|
if err != nil {
|
|
panic(fmt.Errorf("encode timed wall message failure: %w", err))
|
|
}
|
|
|
|
crc := crc32.Checksum(data, crc32c)
|
|
length := uint32(len(data))
|
|
if length > maxMsgSizeBytes {
|
|
return fmt.Errorf("msg is too big: %d bytes, max: %d bytes", length, maxMsgSizeBytes)
|
|
}
|
|
totalLength := 8 + int(length)
|
|
|
|
msg := make([]byte, totalLength)
|
|
binary.BigEndian.PutUint32(msg[0:4], crc)
|
|
binary.BigEndian.PutUint32(msg[4:8], length)
|
|
copy(msg[8:], data)
|
|
|
|
_, err = enc.wr.Write(msg)
|
|
return err
|
|
}
|
|
|
|
// IsDataCorruptionError returns true if data has been corrupted inside WAL.
|
|
func IsDataCorruptionError(err error) bool {
|
|
_, ok := err.(DataCorruptionError)
|
|
return ok
|
|
}
|
|
|
|
// DataCorruptionError is an error that occures if data on disk was corrupted.
|
|
type DataCorruptionError struct {
|
|
cause error
|
|
}
|
|
|
|
func (e DataCorruptionError) Error() string {
|
|
return fmt.Sprintf("DataCorruptionError[%v]", e.cause)
|
|
}
|
|
|
|
func (e DataCorruptionError) Cause() error {
|
|
return e.cause
|
|
}
|
|
|
|
// A WALDecoder reads and decodes custom-encoded WAL messages from an input
|
|
// stream. See WALEncoder for the format used.
|
|
//
|
|
// It will also compare the checksums and make sure data size is equal to the
|
|
// length from the header. If that is not the case, error will be returned.
|
|
type WALDecoder struct {
|
|
rd io.Reader
|
|
}
|
|
|
|
// NewWALDecoder returns a new decoder that reads from rd.
|
|
func NewWALDecoder(rd io.Reader) *WALDecoder {
|
|
return &WALDecoder{rd}
|
|
}
|
|
|
|
// Decode reads the next custom-encoded value from its reader and returns it.
|
|
func (dec *WALDecoder) Decode() (*TimedWALMessage, error) {
|
|
b := make([]byte, 4)
|
|
|
|
_, err := dec.rd.Read(b)
|
|
if errors.Is(err, io.EOF) {
|
|
return nil, err
|
|
}
|
|
if err != nil {
|
|
return nil, DataCorruptionError{fmt.Errorf("failed to read checksum: %v", err)}
|
|
}
|
|
crc := binary.BigEndian.Uint32(b)
|
|
|
|
b = make([]byte, 4)
|
|
_, err = dec.rd.Read(b)
|
|
if err != nil {
|
|
return nil, DataCorruptionError{fmt.Errorf("failed to read length: %v", err)}
|
|
}
|
|
length := binary.BigEndian.Uint32(b)
|
|
|
|
if length > maxMsgSizeBytes {
|
|
return nil, DataCorruptionError{fmt.Errorf(
|
|
"length %d exceeded maximum possible value of %d bytes",
|
|
length,
|
|
maxMsgSizeBytes)}
|
|
}
|
|
|
|
data := make([]byte, length)
|
|
n, err := dec.rd.Read(data)
|
|
if err != nil {
|
|
return nil, DataCorruptionError{fmt.Errorf("failed to read data: %v (read: %d, wanted: %d)", err, n, length)}
|
|
}
|
|
|
|
// check checksum before decoding data
|
|
actualCRC := crc32.Checksum(data, crc32c)
|
|
if actualCRC != crc {
|
|
return nil, DataCorruptionError{fmt.Errorf("checksums do not match: read: %v, actual: %v", crc, actualCRC)}
|
|
}
|
|
|
|
var res = new(tmcons.TimedWALMessage)
|
|
err = proto.Unmarshal(data, res)
|
|
if err != nil {
|
|
return nil, DataCorruptionError{fmt.Errorf("failed to decode data: %v", err)}
|
|
}
|
|
|
|
walMsg, err := WALFromProto(res.Msg)
|
|
if err != nil {
|
|
return nil, DataCorruptionError{fmt.Errorf("failed to convert from proto: %w", err)}
|
|
}
|
|
tMsgWal := &TimedWALMessage{
|
|
Time: res.Time,
|
|
Msg: walMsg,
|
|
}
|
|
|
|
return tMsgWal, err
|
|
}
|
|
|
|
type nilWAL struct{}
|
|
|
|
var _ WAL = nilWAL{}
|
|
|
|
func (nilWAL) Write(m WALMessage) error { return nil }
|
|
func (nilWAL) WriteSync(m WALMessage) error { return nil }
|
|
func (nilWAL) FlushAndSync() error { return nil }
|
|
func (nilWAL) SearchForEndHeight(height int64, options *WALSearchOptions) (rd io.ReadCloser, found bool, err error) {
|
|
return nil, false, nil
|
|
}
|
|
func (nilWAL) Start() error { return nil }
|
|
func (nilWAL) Stop() error { return nil }
|
|
func (nilWAL) Wait() {}
|