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data_fetch.go
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data_fetch.go
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package syncer
import (
"context"
"errors"
"fmt"
"sync"
"golang.org/x/exp/maps"
"golang.org/x/sync/errgroup"
"github.com/spacemeshos/go-spacemesh/codec"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/fetch"
"github.com/spacemeshos/go-spacemesh/log"
"github.com/spacemeshos/go-spacemesh/p2p"
)
var errNoPeers = errors.New("no peers")
// DataFetch contains the logic of fetching mesh data.
type DataFetch struct {
fetcher
logger log.Log
msh meshProvider
ids idProvider
asCache activeSetCache
mu sync.Mutex
atxSynced map[types.EpochID]map[p2p.Peer]struct{}
}
// NewDataFetch creates a new DataFetch instance.
func NewDataFetch(
msh meshProvider,
fetch fetcher,
ids idProvider,
cache activeSetCache,
lg log.Log,
) *DataFetch {
return &DataFetch{
fetcher: fetch,
logger: lg,
msh: msh,
ids: ids,
asCache: cache,
atxSynced: map[types.EpochID]map[p2p.Peer]struct{}{},
}
}
type threadSafeErr struct {
err error
mu sync.Mutex
}
func (e *threadSafeErr) join(err error) {
e.mu.Lock()
defer e.mu.Unlock()
e.err = errors.Join(e.err, err)
}
// PollMaliciousProofs polls all peers for malicious NodeIDs.
func (d *DataFetch) PollMaliciousProofs(ctx context.Context) error {
peers := d.fetcher.SelectBestShuffled(fetch.RedundantPeers)
logger := d.logger.WithContext(ctx)
maliciousIDs := make(chan fetch.MaliciousIDs, len(peers))
var eg errgroup.Group
fetchErr := threadSafeErr{}
for _, peer := range peers {
peer := peer
eg.Go(func() error {
data, err := d.fetcher.GetMaliciousIDs(ctx, peer)
if err != nil {
malPeerError.Inc()
logger.With().Debug("failed to get malicious IDs", log.Err(err), log.Stringer("peer", peer))
fetchErr.join(err)
return nil
}
var malIDs fetch.MaliciousIDs
if err := codec.Decode(data, &malIDs); err != nil {
logger.With().Debug("failed to decode", log.Err(err))
fetchErr.join(err)
return nil
}
logger.With().Debug("received malicious id from peer", log.Stringer("peer", peer))
maliciousIDs <- malIDs
return nil
})
}
_ = eg.Wait()
close(maliciousIDs)
allIds := make(map[types.NodeID]struct{})
success := false
for ids := range maliciousIDs {
success = true
for _, id := range ids.NodeIDs {
allIds[id] = struct{}{}
}
}
if !success {
return fetchErr.err
}
var idsToFetch []types.NodeID
for nodeID := range allIds {
if exists, err := d.ids.IdentityExists(nodeID); err != nil {
logger.With().Error("failed to check identity", log.Err(err))
continue
} else if !exists {
logger.With().Info("malicious identity does not exist", log.Stringer("identity", nodeID))
continue
}
idsToFetch = append(idsToFetch, nodeID)
}
if err := d.fetcher.GetMalfeasanceProofs(ctx, idsToFetch); err != nil {
return fmt.Errorf("getting malfeasance proofs: %w", err)
}
return nil
}
// PollLayerData polls all peers for data in the specified layer.
func (d *DataFetch) PollLayerData(ctx context.Context, lid types.LayerID, peers ...p2p.Peer) error {
if len(peers) == 0 {
peers = d.fetcher.SelectBestShuffled(fetch.RedundantPeers)
if len(peers) == 0 {
return errNoPeers
}
}
logger := d.logger.WithContext(ctx).WithFields(lid)
layerData := make(chan fetch.LayerData, len(peers))
var eg errgroup.Group
fetchErr := threadSafeErr{}
for _, peer := range peers {
peer := peer
eg.Go(func() error {
data, err := d.fetcher.GetLayerData(ctx, peer, lid)
if err != nil {
layerPeerError.Inc()
logger.With().Debug("failed to get layer data", log.Err(err), log.Stringer("peer", peer))
fetchErr.join(err)
return nil
}
var ld fetch.LayerData
if err := codec.Decode(data, &ld); err != nil {
logger.With().Debug("failed to decode", log.Err(err))
fetchErr.join(err)
return nil
}
logger.With().Debug("received layer data from peer", log.Stringer("peer", peer))
registerLayerHashes(d.fetcher, peer, &ld)
layerData <- ld
return nil
})
}
_ = eg.Wait()
close(layerData)
allBallots := make(map[types.BallotID]struct{})
success := false
for ld := range layerData {
success = true
for _, id := range ld.Ballots {
allBallots[id] = struct{}{}
}
}
if !success {
return fetchErr.err
}
if err := d.fetcher.GetBallots(ctx, maps.Keys(allBallots)); err != nil {
return fmt.Errorf("getting ballots: %w", err)
}
return nil
}
// registerLayerHashes registers hashes with the peer that provides these hashes.
func registerLayerHashes(fetcher fetcher, peer p2p.Peer, data *fetch.LayerData) {
if len(data.Ballots) == 0 {
return
}
var layerHashes []types.Hash32
for _, ballotID := range data.Ballots {
layerHashes = append(layerHashes, ballotID.AsHash32())
}
fetcher.RegisterPeerHashes(peer, layerHashes)
}
func (d *DataFetch) PollLayerOpinions(
ctx context.Context,
lid types.LayerID,
needCert bool,
peers []p2p.Peer,
) ([]*fetch.LayerOpinion, []*types.Certificate, error) {
logger := d.logger.WithContext(ctx).WithFields(lid)
opinions := make(chan *fetch.LayerOpinion, len(peers))
var eg errgroup.Group
fetchErr := threadSafeErr{}
for _, peer := range peers {
peer := peer
eg.Go(func() error {
data, err := d.fetcher.GetLayerOpinions(ctx, peer, lid)
if err != nil {
opnsPeerError.Inc()
logger.With().Debug("received peer error for layer opinions", log.Err(err), log.Stringer("peer", peer))
fetchErr.join(err)
return nil
}
var lo fetch.LayerOpinion
if err := codec.Decode(data, &lo); err != nil {
logger.With().Debug("failed to decode layer opinion", log.Err(err))
fetchErr.join(err)
return nil
}
logger.With().Debug("received layer opinion", log.Stringer("peer", peer))
lo.SetPeer(peer)
opinions <- &lo
return nil
})
}
_ = eg.Wait()
close(opinions)
var allOpinions []*fetch.LayerOpinion
success := false
for op := range opinions {
success = true
allOpinions = append(allOpinions, op)
}
if !success {
return nil, nil, fetchErr.err
}
certs := make([]*types.Certificate, 0, len(allOpinions))
if needCert {
peerCerts := map[types.BlockID][]p2p.Peer{}
for _, opinion := range allOpinions {
if opinion.Certified == nil {
continue
}
if _, ok := peerCerts[*opinion.Certified]; !ok {
peerCerts[*opinion.Certified] = []p2p.Peer{}
}
peerCerts[*opinion.Certified] = append(peerCerts[*opinion.Certified], opinion.Peer())
// note that we want to fetch block certificate for types.EmptyBlockID as well,
// but we don't need to register hash for the actual block fetching
if *opinion.Certified != types.EmptyBlockID {
d.fetcher.RegisterPeerHashes(
opinion.Peer(),
[]types.Hash32{opinion.Certified.AsHash32()},
)
}
}
for bid, bidPeers := range peerCerts {
cert, err := d.fetcher.GetCert(ctx, lid, bid, bidPeers)
if err != nil {
certPeerError.Inc()
continue
}
certs = append(certs, cert)
}
}
return allOpinions, certs, nil
}
func (d *DataFetch) pickAtxPeer(epoch types.EpochID, peers []p2p.Peer) p2p.Peer {
d.mu.Lock()
defer d.mu.Unlock()
if _, ok := d.atxSynced[epoch]; !ok {
d.atxSynced[epoch] = map[p2p.Peer]struct{}{}
delete(d.atxSynced, epoch-1)
}
for _, p := range peers {
if _, ok := d.atxSynced[epoch][p]; !ok {
return p
}
}
return p2p.NoPeer
}
func (d *DataFetch) updateAtxPeer(epoch types.EpochID, peer p2p.Peer) {
d.mu.Lock()
defer d.mu.Unlock()
d.atxSynced[epoch][peer] = struct{}{}
}
// GetEpochATXs fetches all ATXs published in the specified epoch from a peer.
func (d *DataFetch) GetEpochATXs(ctx context.Context, epoch types.EpochID) error {
peers := d.fetcher.SelectBestShuffled(fetch.RedundantPeers)
if len(peers) == 0 {
return errNoPeers
}
peer := d.pickAtxPeer(epoch, peers)
if peer == p2p.NoPeer {
d.logger.WithContext(ctx).With().Debug("synced atxs from all peers",
epoch,
log.Int("peers", len(peers)),
)
return nil
}
ed, err := d.fetcher.PeerEpochInfo(ctx, peer, epoch)
if err != nil {
atxPeerError.Inc()
return fmt.Errorf("get epoch info (peer %v): %w", peer, err)
}
if len(ed.AtxIDs) == 0 {
d.logger.WithContext(ctx).With().Debug("peer have zero atx",
epoch,
log.Stringer("peer", peer),
)
return nil
}
d.updateAtxPeer(epoch, peer)
d.fetcher.RegisterPeerHashes(peer, types.ATXIDsToHashes(ed.AtxIDs))
missing := d.asCache.GetMissingActiveSet(epoch+1, ed.AtxIDs)
d.logger.WithContext(ctx).With().Debug("fetching atxs",
epoch,
log.Stringer("peer", peer),
log.Int("total", len(ed.AtxIDs)),
log.Int("missing", len(missing)),
)
if len(missing) > 0 {
if err := d.fetcher.GetAtxs(ctx, missing); err != nil {
return fmt.Errorf("get ATXs: %w", err)
}
}
return nil
}