/
raftCommon.go
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/
raftCommon.go
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package consensus
import (
"bytes"
"context"
"crypto/sha1"
"encoding/binary"
"encoding/gob"
"encoding/json"
"errors"
"fmt"
"github.com/aergoio/aergo/internal/enc"
"github.com/aergoio/aergo/types"
"github.com/aergoio/etcd/raft"
"github.com/aergoio/etcd/raft/raftpb"
"io"
)
type EntryType int8
const (
EntryBlock EntryType = iota
EntryEmpty // it is generated when node becomes leader
EntryConfChange
InvalidMemberID = 0
)
type ConfChangePropose struct {
Ctx context.Context
Cc *raftpb.ConfChange
ReplyC chan *ConfChangeReply
}
type ConfChangeReply struct {
Member *Member
Err error
}
var (
WalEntryType_name = map[EntryType]string{
0: "EntryBlock",
1: "EntryEmpty",
2: "EntryConfChange",
}
ErrURLInvalidScheme = errors.New("url has invalid scheme")
ErrURLInvalidPort = errors.New("url must have host:port style")
ErrInvalidMemberID = errors.New("member id of conf change doesn't match")
ErrEmptySnapData = errors.New("failed to decode snapshot data. encoded data is empty")
ErrInvalidMemberAttr = errors.New("invalid member attribute")
ErrorMembershipChangeSkip = errors.New("node is not raft leader, so skip membership change request")
)
type WalEntry struct {
Type EntryType
Term uint64
Index uint64
Data []byte // hash is set if Type is EntryBlock
}
func (we *WalEntry) ToBytes() ([]byte, error) {
var val bytes.Buffer
encoder := gob.NewEncoder(&val)
if err := encoder.Encode(we); err != nil {
panic("raft entry to bytes error")
return nil, err
}
return val.Bytes(), nil
}
func (we *WalEntry) ToString() string {
if we == nil {
return "wal entry is nil"
}
return fmt.Sprintf("wal entry[type:%s, index:%d, term:%d", WalEntryType_name[we.Type], we.Index, we.Term)
}
type RaftIdentity struct {
ClusterID uint64
ID uint64
Name string
}
func (rid *RaftIdentity) ToString() string {
if rid == nil {
return "raft identity is nil"
}
return fmt.Sprintf("raft identity[name:%s, nodeid:%x]", rid.Name, rid.ID)
}
type ChainWAL interface {
ChainDB
ResetWAL(hardStateInfo *types.HardStateInfo) error
GetBlock(blockHash []byte) (*types.Block, error)
WriteRaftEntry([]*WalEntry, []*types.Block, []*raftpb.ConfChange) error
GetRaftEntry(idx uint64) (*WalEntry, error)
HasWal(identity RaftIdentity) (bool, error)
GetRaftEntryOfBlock(hash []byte) (*WalEntry, error)
GetRaftEntryLastIdx() (uint64, error)
GetHardState() (*raftpb.HardState, error)
WriteHardState(hardstate *raftpb.HardState) error
WriteSnapshot(snap *raftpb.Snapshot) error
GetSnapshot() (*raftpb.Snapshot, error)
WriteIdentity(id *RaftIdentity) error
GetIdentity() (*RaftIdentity, error)
WriteConfChangeProgress(id uint64, progress *types.ConfChangeProgress) error
GetConfChangeProgress(id uint64) (*types.ConfChangeProgress, error)
}
type SnapshotData struct {
Chain ChainSnapshot `json:"chain"`
Members []*Member `json:"members"`
RemovedMembers []*Member
}
func NewSnapshotData(members []*Member, rmMembers []*Member, block *types.Block) *SnapshotData {
if block == nil {
return nil
}
return &SnapshotData{
Chain: *NewChainSnapshot(block),
Members: members,
RemovedMembers: rmMembers,
}
}
func (snapd *SnapshotData) Encode() ([]byte, error) {
return json.Marshal(snapd)
}
func (snapd *SnapshotData) Decode(data []byte) error {
if len(data) == 0 {
return ErrEmptySnapData
}
return json.Unmarshal(data, snapd)
}
func (snapd *SnapshotData) Equal(t *SnapshotData) bool {
if !snapd.Chain.Equal(&t.Chain) {
return false
}
if len(t.Members) != len(snapd.Members) {
return false
}
for i, m := range snapd.Members {
tMbr := t.Members[i]
if !m.Equal(tMbr) {
return false
}
}
return true
}
func (snapd *SnapshotData) ToString() string {
var buf string
buf += fmt.Sprintf("chain:%s, ", snapd.Chain.ToString())
printMembers := func(mbrs []*Member, name string) {
if len(mbrs) > 0 {
buf += fmt.Sprintf("%s[", name)
for i, m := range mbrs {
buf += fmt.Sprintf("#%d{%s}", i, m.ToString())
}
buf += fmt.Sprintf("]")
}
}
printMembers(snapd.Members, "members")
printMembers(snapd.RemovedMembers, "removed members")
return buf
}
type ChainSnapshot struct {
No types.BlockNo `json:"no"`
Hash []byte `json:"hash"`
}
func NewChainSnapshot(block *types.Block) *ChainSnapshot {
if block == nil {
return nil
}
return &ChainSnapshot{No: block.BlockNo(), Hash: block.BlockHash()}
}
func (csnap *ChainSnapshot) Equal(other *ChainSnapshot) bool {
return csnap.No == other.No && bytes.Equal(csnap.Hash, other.Hash)
}
func (csnap *ChainSnapshot) ToString() string {
if csnap == nil || csnap.Hash == nil {
return "csnap: empty"
}
return fmt.Sprintf("chainsnap:(no=%d, hash=%s)", csnap.No, enc.ToString(csnap.Hash))
}
/*
func (csnap *ChainSnapshot) Encode() ([]byte, error) {
var val bytes.Buffer
encoder := gob.NewEncoder(&val)
if err := encoder.Encode(csnap); err != nil {
logger.Fatal().Err(err).Msg("failed to encode chainsnap")
return nil, err
}
return val.Bytes(), nil
}
func DecodeChainSnapshot(data []byte) (*ChainSnapshot, error) {
var snap ChainSnapshot
var b bytes.Buffer
b.Write(data)
if data == nil {
return nil, ErrEmptySnapData
}
decoder := gob.NewDecoder(&b)
if err := decoder.Decode(&snap); err != nil {
logger.Fatal().Err(err).Msg("failed to decode chainsnap")
return nil, err
}
return &snap, nil
}*/
func ConfStateToString(conf *raftpb.ConfState) string {
var buf string
if len(conf.Nodes) > 0 {
buf = fmt.Sprintf("node")
for _, node := range conf.Nodes {
buf = buf + fmt.Sprintf("[%x]", node)
}
}
if len(conf.Learners) > 0 {
buf = buf + fmt.Sprintf(".learner")
for _, learner := range conf.Learners {
buf = buf + fmt.Sprintf("[%x]", learner)
}
}
return buf
}
func SnapToString(snap *raftpb.Snapshot, snapd *SnapshotData) string {
var buf string
buf = buf + fmt.Sprintf("snap=[index:%d term:%d conf:%s]", snap.Metadata.Index, snap.Metadata.Term, ConfStateToString(&snap.Metadata.ConfState))
if snapd != nil {
buf = buf + fmt.Sprintf(", %s", snapd.ToString())
}
return buf
}
type Member struct {
types.MemberAttr
}
func NewMember(name string, address string, peerID types.PeerID, chainID []byte, when int64) *Member {
//check unique
m := &Member{MemberAttr: types.MemberAttr{Name: name, Address: address, PeerID: []byte(peerID)}}
//make ID
m.CalculateMemberID(chainID, when)
return m
}
func (m *Member) Clone() *Member {
newM := Member{MemberAttr: types.MemberAttr{ID: m.ID, Name: m.Name, Address: m.Address}}
copy(newM.PeerID, m.PeerID)
return &newM
}
func (m *Member) SetAttr(attr *types.MemberAttr) {
m.MemberAttr = *attr
}
func (m *Member) SetMemberID(id uint64) {
m.ID = id
}
func (m *Member) CalculateMemberID(chainID []byte, curTimestamp int64) {
var buf []byte
buf = append(buf, []byte(m.Name)...)
buf = append(buf, []byte(chainID)...)
buf = append(buf, []byte(fmt.Sprintf("%d", curTimestamp))...)
hash := sha1.Sum(buf)
m.ID = binary.LittleEndian.Uint64(hash[:8])
}
func (m *Member) IsValid() bool {
if m.ID == InvalidMemberID || len(m.PeerID) == 0 || len(m.Name) == 0 || len(m.Address) == 0 {
return false
}
if _, err := types.ParseMultiaddrWithResolve(m.Address); err != nil {
logger.Error().Err(err).Msg("parse address of member")
return false
}
return true
}
func (m *Member) GetPeerID() types.PeerID {
return types.PeerID(m.PeerID)
}
func (m *Member) Equal(other *Member) bool {
return m.ID == other.ID &&
bytes.Equal(m.PeerID, other.PeerID) &&
m.Name == other.Name &&
m.Address == other.Address &&
bytes.Equal([]byte(m.PeerID), []byte(other.PeerID))
}
func (m *Member) ToString() string {
data, err := json.Marshal(&m.MemberAttr)
if err != nil {
logger.Error().Err(err).Str("name", m.Name).Msg("can't unmarshal member")
return ""
}
return string(data)
}
func (m *Member) HasDuplicatedAttr(x *Member) bool {
if m.Name == x.Name || m.ID == x.ID || m.Address == x.Address || bytes.Equal(m.PeerID, x.PeerID) {
return true
}
return false
}
// IsCompatible checks if name, url and peerid of this member are the same with other member
func (m *Member) IsCompatible(other *Member) bool {
return m.Name == other.Name && m.Address == other.Address && bytes.Equal(m.PeerID, other.PeerID)
}
type MembersByName []*Member
func (mbrs MembersByName) Len() int {
return len(mbrs)
}
func (mbrs MembersByName) Less(i, j int) bool {
return mbrs[i].Name < mbrs[j].Name
}
func (mbrs MembersByName) Swap(i, j int) {
mbrs[i], mbrs[j] = mbrs[j], mbrs[i]
}
// DummyRaftAccessor returns error if process request comes, or silently ignore raft message.
type DummyRaftAccessor struct {
}
var IllegalArgumentError = errors.New("illegal argument")
func (DummyRaftAccessor) Process(ctx context.Context, peerID types.PeerID, m raftpb.Message) error {
return IllegalArgumentError
}
func (DummyRaftAccessor) IsIDRemoved(peerID types.PeerID) bool {
return false
}
func (DummyRaftAccessor) ReportUnreachable(peerID types.PeerID) {
}
func (DummyRaftAccessor) ReportSnapshot(peerID types.PeerID, status raft.SnapshotStatus) {
}
func (DummyRaftAccessor) GetMemberByID(id uint64) *Member {
return nil
}
func (DummyRaftAccessor) GetMemberByPeerID(peerID types.PeerID) *Member {
return nil
}
func (DummyRaftAccessor) SaveFromRemote(r io.Reader, id uint64, msg raftpb.Message) (int64, error) {
return 0, nil
}