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.
318 lines
8.4 KiB
318 lines
8.4 KiB
package consensus
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"hash/crc32"
|
|
"io"
|
|
"path/filepath"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
|
|
"github.com/tendermint/go-amino"
|
|
"github.com/tendermint/tendermint/types"
|
|
auto "github.com/tendermint/tmlibs/autofile"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
)
|
|
|
|
const (
|
|
// must be greater than params.BlockGossip.BlockPartSizeBytes + a few bytes
|
|
maxMsgSizeBytes = 1024 * 1024 // 1MB
|
|
)
|
|
|
|
//--------------------------------------------------------
|
|
// types and functions for savings consensus messages
|
|
|
|
type TimedWALMessage struct {
|
|
Time time.Time `json:"time"` // for debugging purposes
|
|
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 RegisterWALMessages(cdc *amino.Codec) {
|
|
cdc.RegisterInterface((*WALMessage)(nil), nil)
|
|
cdc.RegisterConcrete(types.EventDataRoundState{}, "tendermint/wal/EventDataRoundState", nil)
|
|
cdc.RegisterConcrete(msgInfo{}, "tendermint/wal/MsgInfo", nil)
|
|
cdc.RegisterConcrete(timeoutInfo{}, "tendermint/wal/TimeoutInfo", nil)
|
|
cdc.RegisterConcrete(EndHeightMessage{}, "tendermint/wal/EndHeightMessage", nil)
|
|
}
|
|
|
|
//--------------------------------------------------------
|
|
// Simple write-ahead logger
|
|
|
|
// WAL is an interface for any write-ahead logger.
|
|
type WAL interface {
|
|
Save(WALMessage)
|
|
Group() *auto.Group
|
|
SearchForEndHeight(height int64, options *WALSearchOptions) (gr *auto.GroupReader, found bool, err error)
|
|
|
|
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 {
|
|
cmn.BaseService
|
|
|
|
group *auto.Group
|
|
light bool // ignore block parts
|
|
|
|
enc *WALEncoder
|
|
}
|
|
|
|
func NewWAL(walFile string, light bool) (*baseWAL, error) {
|
|
err := cmn.EnsureDir(filepath.Dir(walFile), 0700)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "failed to ensure WAL directory is in place")
|
|
}
|
|
|
|
group, err := auto.OpenGroup(walFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
wal := &baseWAL{
|
|
group: group,
|
|
light: light,
|
|
enc: NewWALEncoder(group),
|
|
}
|
|
wal.BaseService = *cmn.NewBaseService(nil, "baseWAL", wal)
|
|
return wal, nil
|
|
}
|
|
|
|
func (wal *baseWAL) Group() *auto.Group {
|
|
return wal.group
|
|
}
|
|
|
|
func (wal *baseWAL) OnStart() error {
|
|
size, err := wal.group.Head.Size()
|
|
if err != nil {
|
|
return err
|
|
} else if size == 0 {
|
|
wal.Save(EndHeightMessage{0})
|
|
}
|
|
err = wal.group.Start()
|
|
return err
|
|
}
|
|
|
|
func (wal *baseWAL) OnStop() {
|
|
wal.BaseService.OnStop()
|
|
wal.group.Stop()
|
|
}
|
|
|
|
// called in newStep and for each pass in receiveRoutine
|
|
func (wal *baseWAL) Save(msg WALMessage) {
|
|
if wal == nil {
|
|
return
|
|
}
|
|
|
|
if wal.light {
|
|
// in light mode we only write new steps, timeouts, and our own votes (no proposals, block parts)
|
|
if mi, ok := msg.(msgInfo); ok {
|
|
if mi.PeerID != "" {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// Write the wal message
|
|
if err := wal.enc.Encode(&TimedWALMessage{time.Now(), msg}); err != nil {
|
|
cmn.PanicQ(cmn.Fmt("Error writing msg to consensus wal: %v \n\nMessage: %v", err, msg))
|
|
}
|
|
|
|
// TODO: only flush when necessary
|
|
if err := wal.group.Flush(); err != nil {
|
|
cmn.PanicQ(cmn.Fmt("Error flushing consensus wal buf to file. Error: %v \n", err))
|
|
}
|
|
}
|
|
|
|
// 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 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) (gr *auto.GroupReader, found bool, err error) {
|
|
var msg *TimedWALMessage
|
|
|
|
// 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.Debug("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 {
|
|
// check next file
|
|
break
|
|
}
|
|
if options.IgnoreDataCorruptionErrors && IsDataCorruptionError(err) {
|
|
// do nothing
|
|
} else if err != nil {
|
|
gr.Close()
|
|
return nil, false, err
|
|
}
|
|
|
|
if m, ok := msg.Msg.(EndHeightMessage); ok {
|
|
if m.Height == height { // found
|
|
wal.Logger.Debug("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 (go-amino encoded)
|
|
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.
|
|
func (enc *WALEncoder) Encode(v *TimedWALMessage) error {
|
|
data := cdc.MustMarshalBinaryBare(v)
|
|
|
|
crc := crc32.Checksum(data, crc32c)
|
|
length := uint32(len(data))
|
|
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 err == io.EOF {
|
|
return nil, err
|
|
}
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to read checksum: %v", err)
|
|
}
|
|
crc := binary.BigEndian.Uint32(b)
|
|
|
|
b = make([]byte, 4)
|
|
_, err = dec.rd.Read(b)
|
|
if err == io.EOF {
|
|
return nil, err
|
|
}
|
|
if err != nil {
|
|
return nil, 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)
|
|
_, err = dec.rd.Read(data)
|
|
if err == io.EOF {
|
|
return nil, err
|
|
}
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to read data: %v", err)
|
|
}
|
|
|
|
// 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(TimedWALMessage) // nolint: gosimple
|
|
err = cdc.UnmarshalBinaryBare(data, res)
|
|
if err != nil {
|
|
return nil, DataCorruptionError{fmt.Errorf("failed to decode data: %v", err)}
|
|
}
|
|
|
|
return res, err
|
|
}
|
|
|
|
type nilWAL struct{}
|
|
|
|
func (nilWAL) Save(m WALMessage) {}
|
|
func (nilWAL) Group() *auto.Group { return nil }
|
|
func (nilWAL) SearchForEndHeight(height int64, options *WALSearchOptions) (gr *auto.GroupReader, found bool, err error) {
|
|
return nil, false, nil
|
|
}
|
|
func (nilWAL) Start() error { return nil }
|
|
func (nilWAL) Stop() error { return nil }
|
|
func (nilWAL) Wait() {}
|