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syncer.go
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syncer.go
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package protocol
import (
"context"
"errors"
"fmt"
"math"
"sync"
"time"
"github.com/cornelk/hashmap"
"github.com/hashicorp/go-hclog"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/smallnest/chanx"
"github.com/sunvim/dogesyncer/blockchain"
"github.com/sunvim/dogesyncer/helper/progress"
"github.com/sunvim/dogesyncer/network"
"github.com/sunvim/dogesyncer/network/event"
libp2pGrpc "github.com/sunvim/dogesyncer/network/grpc"
"github.com/sunvim/dogesyncer/protocol/proto"
"github.com/sunvim/dogesyncer/types"
grpccodes "google.golang.org/grpc/codes"
grpcstatus "google.golang.org/grpc/status"
anypb "google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/emptypb"
)
const (
_syncerName = "syncer"
_syncerV1 = "/syncer/0.1"
)
const (
maxEnqueueSize = 50
popTimeout = 10 * time.Second
)
var (
ErrLoadLocalGenesisFailed = errors.New("failed to read local genesis")
ErrMismatchGenesis = errors.New("genesis does not match")
ErrCommonAncestorNotFound = errors.New("header is nil")
ErrForkNotFound = errors.New("fork not found")
ErrPopTimeout = errors.New("timeout")
ErrConnectionClosed = errors.New("connection closed")
ErrTooManyHeaders = errors.New("unexpected more than 1 result")
ErrDecodeDifficulty = errors.New("failed to decode difficulty")
ErrInvalidTypeAssertion = errors.New("invalid type assertion")
)
// blocks sorted by number (ascending)
// Syncer is a sync protocol
type Syncer struct {
logger hclog.Logger
blockchain blockchainShim
peers *hashmap.Map[peer.ID, *SyncPeer] // Maps peer.ID -> SyncPeer
serviceV1 *serviceV1
status *Status
statusLock sync.Mutex
server *network.Server
syncProgression *progress.ProgressionWrapper
// save new block info from remote peer
enqueue *PriorityQueue
enqueueCh *chanx.UnboundedChan[struct{}]
stxRecv bool
onceSend *sync.Once
stopSync chan struct{}
}
// NewSyncer creates a new Syncer instance
func NewSyncer(logger hclog.Logger, server *network.Server, blockchain blockchainShim, datadir string) *Syncer {
const defQueueSize = 819200
s := &Syncer{
logger: logger.Named(_syncerName),
blockchain: blockchain,
server: server,
syncProgression: progress.NewProgressionWrapper(progress.ChainSyncBulk),
peers: hashmap.New[peer.ID, *SyncPeer](),
enqueue: NewPriorityQueue(defQueueSize, false),
enqueueCh: chanx.NewUnboundedChan[struct{}](defQueueSize),
onceSend: &sync.Once{},
stopSync: make(chan struct{}),
}
return s
}
func (s *Syncer) Close() error {
close(s.stopSync)
return nil
}
// GetSyncProgression returns the latest sync progression, if any
func (s *Syncer) GetSyncProgression() *progress.Progression {
return s.syncProgression.GetProgression()
}
// syncCurrentStatus taps into the blockchain event steam and updates the Syncer.status field
func (s *Syncer) syncCurrentStatus(ctx context.Context) {
sub := s.blockchain.SubscribeEvents()
eventCh := sub.GetEventCh()
// watch the subscription and notify
for {
select {
case evnt := <-eventCh:
if evnt.Type == blockchain.EventFork {
// we do not want to notify forks
continue
}
if len(evnt.NewChain) == 0 {
// this should not happen
continue
}
status := &Status{
Difficulty: evnt.Difficulty,
Hash: evnt.NewChain[0].Hash,
Number: evnt.NewChain[0].Number,
}
s.updateStatus(status)
return
}
}
}
func (s *Syncer) updateStatus(status *Status) {
s.statusLock.Lock()
defer s.statusLock.Unlock()
// compare current status, would only update until new height meet or fork happens
switch {
case status.Number < s.status.Number:
return
case status.Number == s.status.Number:
if status.Hash == s.status.Hash {
return
}
}
s.logger.Debug("update syncer status", "status", status)
s.status = status
}
// enqueueBlock adds the specific block to the peerID queue
func (s *Syncer) enqueueBlock(peerID peer.ID, b *types.Block) {
s.logger.Debug("enqueue block", "peer", peerID, "number", b.Number(), "hash", b.Hash())
if s.blockchain.Header().Number >= b.Number() {
return
}
s.enqueue.Put(b)
s.enqueueCh.In <- struct{}{}
}
func (s *Syncer) updatePeerStatus(peerID peer.ID, status *Status) {
s.logger.Debug(
"update peer status",
"peer",
peerID,
"latest block number",
status.Number,
"latest block hash",
status.Hash, "difficulty",
status.Difficulty,
)
if syncPeer, ok := s.peers.Get(peerID); ok {
syncPeer.updateStatus(status)
}
}
// Broadcast broadcasts a block to all peers
func (s *Syncer) Broadcast(b *types.Block) {
sendNotify := func(peerID peer.ID, syncPeer *SyncPeer, req *proto.NotifyReq) {
startTime := time.Now()
if _, err := syncPeer.client.Notify(context.Background(), req); err != nil {
s.logger.Error("failed to notify", "err", err)
return
}
duration := time.Since(startTime)
s.logger.Debug(
"notifying peer",
"id", peerID,
"duration", duration.Seconds(),
)
}
// Get the chain difficulty associated with block
td, ok := s.blockchain.GetTD(b.Hash())
if !ok {
// not supposed to happen
s.logger.Error("total difficulty not found", "block number", b.Number())
return
}
// broadcast the new block to all the peers
req := &proto.NotifyReq{
Status: &proto.V1Status{
Hash: b.Hash().String(),
Number: b.Number(),
Difficulty: td.String(),
},
Raw: &anypb.Any{
Value: b.MarshalRLP(),
},
}
s.logger.Debug("broadcast start")
s.peers.Range(func(peerID peer.ID, peer *SyncPeer) bool {
go sendNotify(peerID, peer, req)
return true
})
s.logger.Debug("broadcast end")
}
// Start starts the syncer protocol
func (s *Syncer) Start(ctx context.Context) {
s.serviceV1 = &serviceV1{
syncer: s,
logger: s.logger.With("name", "serviceV1"),
store: s.blockchain,
}
// Get the current status of the syncer
currentHeader := s.blockchain.Header()
diff, _ := s.blockchain.GetTD(currentHeader.Hash)
s.status = &Status{
Hash: currentHeader.Hash,
Number: currentHeader.Number,
Difficulty: diff,
}
// Run the blockchain event listener loop
go s.syncCurrentStatus(ctx)
// Register the grpc protocol for syncer
grpcStream := libp2pGrpc.NewGrpcStream()
proto.RegisterV1Server(grpcStream.GrpcServer(), s.serviceV1)
grpcStream.Serve()
s.server.RegisterProtocol(_syncerV1, grpcStream)
s.setupPeers()
go s.handlePeerEvent(ctx)
go s.SyncWork(ctx)
go s.WatchSync(ctx)
}
func (s *Syncer) WatchSync(ctx context.Context) {
defer s.logger.Info("exit handle new block")
var (
newblock = &types.Block{}
)
for {
select {
case <-s.stopSync:
return
case <-s.enqueueCh.Out:
items, err := s.enqueue.Get(1)
if err != nil {
s.logger.Error("watch sync", "err", err)
continue
}
newblock = items[0]
stx := time.Now()
err = s.blockchain.WriteBlock(newblock)
if err != nil {
s.logger.Error("handle new block", "err", err)
return
}
s.logger.Info("write block", "time", time.Since(stx))
}
}
}
const (
syncFinishedSize = 16
maxSkeletonHeadersAmount = 190
stepSkeletonHeadersAmount = 30
)
// number: 687 have tx
func (s *Syncer) SyncWork(ctx context.Context) {
s.logger.Info("starting to sync block ...")
defer s.logger.Info("exit sync work!")
var (
p *SyncPeer
ancestor *types.Header
err error
blockCh = make(chan []*types.Block, 4096)
block *types.Block
)
go func(ctx context.Context) {
for blocks := range blockCh {
for _, block = range blocks {
s.enqueue.Put(block)
s.enqueueCh.In <- struct{}{}
}
}
}(ctx)
for {
select {
case <-s.stopSync:
return
default:
p = s.BestPeer()
if p == nil {
s.logger.Info("not found best peer")
time.Sleep(10 * time.Second)
continue
}
// find the common ancestor
ancestor, _, err = s.findCommonAncestor(p.client, p.status)
// check whether peer network same with us
if isDifferentNetworkError(err) {
s.server.DisconnectFromPeer(p.peer, "Different network")
}
// return error
if err != nil {
continue
}
s.logger.Info("fork found", "ancestor", ancestor.Number, "target", p.status.Number, "peer", p.ID())
// start to revieve new block
if ancestor.Number+syncFinishedSize > p.status.Number {
s.StartToRecieveNewBlock()
}
var (
target uint64 = p.status.Number
currentSyncHeight = ancestor.Number + 1
)
// sync finished
if currentSyncHeight == target {
close(blockCh)
return
}
blockAmount := maxSkeletonHeadersAmount
for {
sk := &skeleton{
amount: int64(blockAmount),
}
err = sk.getBlocksFromPeer(p.client, currentSyncHeight)
if err != nil {
if rpcErr, ok := grpcstatus.FromError(err); ok {
// the data size exceeds grpc server/client message size
if rpcErr.Code() == grpccodes.ResourceExhausted {
blockAmount /= 2
continue
}
}
break
}
blockAmount = maxSkeletonHeadersAmount
blockCh <- sk.blocks
currentSyncHeight += uint64(len(sk.blocks))
// check again
if currentSyncHeight >= target {
continue
}
}
}
}
}
func (s *Syncer) StartToRecieveNewBlock() {
s.onceSend.Do(func() {
s.stxRecv = true
})
}
// setupPeers adds connected peers as syncer peers
func (s *Syncer) setupPeers() {
for _, p := range s.server.Peers() {
if addErr := s.AddPeer(p.Info.ID); addErr != nil {
s.logger.Error(fmt.Sprintf("Error when adding peer [%s], %v", p.Info.ID, addErr))
}
}
}
// handlePeerEvent subscribes network event and adds/deletes peer from syncer
func (s *Syncer) handlePeerEvent(ctx context.Context) {
updateCh, err := s.server.SubscribeCh()
if err != nil {
s.logger.Error("failed to subscribe", "err", err)
return
}
go func(ctx context.Context) {
for {
evnt, ok := <-updateCh
if !ok {
return
}
switch evnt.Type {
case event.PeerConnected:
if err := s.AddPeer(evnt.PeerID); err != nil {
s.logger.Error("failed to add peer", "err", err)
}
case event.PeerDisconnected:
if err := s.DeletePeer(evnt.PeerID); err != nil {
s.logger.Error("failed to delete user", "err", err)
}
}
}
}(ctx)
}
// BestPeer returns the best peer by difficulty (if any)
func (s *Syncer) BestPeer() *SyncPeer {
var (
bestPeer *SyncPeer
bestBlockNumber uint64
)
s.peers.Range(func(peerID peer.ID, sp *SyncPeer) bool {
peerBlockNumber := sp.Number()
// compare block height
if bestPeer == nil || peerBlockNumber > bestBlockNumber {
bestPeer = sp
bestBlockNumber = peerBlockNumber
}
return true
})
if bestBlockNumber <= s.blockchain.Header().Number {
bestPeer = nil
}
return bestPeer
}
func (s *Syncer) TakePeerByHeight(height, num uint64) []*SyncPeer {
var (
rs = make([]*SyncPeer, num)
count uint64
)
s.peers.Range(func(peerID peer.ID, sp *SyncPeer) bool {
if sp.Number() > height {
rs[count] = sp
}
count++
if count >= num {
return false
}
return true
})
return rs
}
// AddPeer establishes new connection with the given peer
func (s *Syncer) AddPeer(peerID peer.ID) error {
if _, ok := s.peers.Get(peerID); ok {
// already connected
return nil
}
stream, err := s.server.NewStream(_syncerV1, peerID)
if err != nil {
return fmt.Errorf("failed to open a stream, err %w", err)
}
conn := libp2pGrpc.WrapClient(stream)
// watch for changes of the other node first
clt := proto.NewV1Client(conn)
rawStatus, err := clt.GetCurrent(context.Background(), &emptypb.Empty{})
if err != nil {
return err
}
status, err := statusFromProto(rawStatus)
if err != nil {
return err
}
s.peers.Set(peerID, &SyncPeer{
peer: peerID,
conn: conn,
client: clt,
status: status,
})
return nil
}
// DeletePeer deletes a peer from syncer
func (s *Syncer) DeletePeer(peerID peer.ID) error {
p, ok := s.peers.Get(peerID)
if ok {
s.peers.Del(peerID)
if err := p.conn.Close(); err != nil {
return err
}
}
return nil
}
// findCommonAncestor returns the common ancestor header and fork
func (s *Syncer) findCommonAncestor(clt proto.V1Client, status *Status) (*types.Header, *types.Header, error) {
h := s.blockchain.Header()
min := uint64(0) // genesis
max := h.Number
targetHeight := status.Number
if heightNumber := targetHeight; max > heightNumber {
max = heightNumber
}
var header *types.Header
for min <= max {
m := uint64(math.Floor(float64(min+max) / 2))
if m == 0 {
// our common ancestor is the genesis
genesis, ok := s.blockchain.GetHeaderByNumber(0)
if !ok {
return nil, nil, ErrLoadLocalGenesisFailed
}
header = genesis
break
}
found, err := getHeader(clt, &m, nil)
if err != nil {
return nil, nil, err
}
if found == nil {
// peer does not have the m peer, search in lower bounds
max = m - 1
} else {
expectedHeader, ok := s.blockchain.GetHeaderByNumber(m)
if !ok {
return nil, nil, fmt.Errorf("cannot find the header %d in local chain", m)
}
if expectedHeader.Hash == found.Hash {
header = found
min = m + 1
} else {
if m == 0 {
return nil, nil, ErrMismatchGenesis
}
max = m - 1
}
}
}
if header == nil {
return nil, nil, ErrCommonAncestorNotFound
}
// get the block fork
forkNum := header.Number + 1
fork, err := getHeader(clt, &forkNum, nil)
if err != nil {
return nil, nil, fmt.Errorf("failed to get fork at num %d", header.Number)
}
if fork == nil {
return nil, nil, ErrForkNotFound
}
return header, fork, nil
}
// WatchSyncWithPeer subscribes and adds peer's latest block
func (s *Syncer) logSyncPeerPopBlockError(err error, peer *SyncPeer) {
if errors.Is(err, ErrPopTimeout) {
msg := "failed to pop block within %ds from peer: id=%s, please check if all the validators are running"
s.logger.Warn(fmt.Sprintf(msg, int(popTimeout.Seconds()), peer.peer))
} else {
s.logger.Info("failed to pop block from peer", "id", peer.peer, "err", err)
}
}
func isDifferentNetworkError(err error) bool {
if err == nil {
return false
}
switch {
case errors.Is(err, ErrMismatchGenesis), // genesis not right
errors.Is(err, ErrCommonAncestorNotFound), // might be data missing
errors.Is(err, ErrForkNotFound): // starting block not found
return true
}
return false
}
func getHeader(clt proto.V1Client, num *uint64, hash *types.Hash) (*types.Header, error) {
req := &proto.GetHeadersRequest{}
if num != nil {
req.Number = int64(*num)
}
if hash != nil {
req.Hash = (*hash).String()
}
resp, err := clt.GetHeaders(context.Background(), req)
if err != nil {
return nil, err
}
if len(resp.Objs) == 0 {
return nil, nil
}
if len(resp.Objs) != 1 {
return nil, ErrTooManyHeaders
}
obj := resp.Objs[0]
if obj == nil || obj.Spec == nil || len(obj.Spec.Value) == 0 {
return nil, errNilHeaderResponse
}
header := &types.Header{}
if err := header.UnmarshalRLP(obj.Spec.Value); err != nil {
return nil, err
}
return header, nil
}