mirror of
https://github.com/OffchainLabs/prysm.git
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3a3bd3902c
* PeerDAS: Implement P2P. * Fix Terence's comment. * Fix Terence's comment. * Fix Terence's comment. * Fix Preston's comment. * Fix Preston's comment. * `TopicFromMessage`: Exit early. * Fix Preston's comment. * `TestService_BroadcastDataColumn`: Avoid ugly sleep. * Fix Kasey's comment. * Fix Kasey's comment. * Fix Kasey's comment. * Fix Kasey's comment.
504 lines
18 KiB
Go
504 lines
18 KiB
Go
package p2p
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import (
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"bytes"
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"context"
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"fmt"
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"reflect"
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"time"
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"github.com/OffchainLabs/prysm/v6/beacon-chain/core/altair"
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"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
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fieldparams "github.com/OffchainLabs/prysm/v6/config/fieldparams"
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"github.com/OffchainLabs/prysm/v6/config/params"
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"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
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"github.com/OffchainLabs/prysm/v6/crypto/hash"
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"github.com/OffchainLabs/prysm/v6/monitoring/tracing"
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"github.com/OffchainLabs/prysm/v6/monitoring/tracing/trace"
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"github.com/OffchainLabs/prysm/v6/network/forks"
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ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
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"github.com/OffchainLabs/prysm/v6/time/slots"
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"github.com/pkg/errors"
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ssz "github.com/prysmaticlabs/fastssz"
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"github.com/sirupsen/logrus"
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"google.golang.org/protobuf/proto"
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)
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// ErrMessageNotMapped occurs on a Broadcast attempt when a message has not been defined in the
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// GossipTypeMapping.
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var ErrMessageNotMapped = errors.New("message type is not mapped to a PubSub topic")
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// Broadcast a message to the p2p network, the message is assumed to be
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// broadcasted to the current fork.
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func (s *Service) Broadcast(ctx context.Context, msg proto.Message) error {
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ctx, span := trace.StartSpan(ctx, "p2p.Broadcast")
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defer span.End()
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twoSlots := time.Duration(2*params.BeaconConfig().SecondsPerSlot) * time.Second
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ctx, cancel := context.WithTimeout(ctx, twoSlots)
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defer cancel()
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forkDigest, err := s.currentForkDigest()
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if err != nil {
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err := errors.Wrap(err, "could not retrieve fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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topic, ok := GossipTypeMapping[reflect.TypeOf(msg)]
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if !ok {
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tracing.AnnotateError(span, ErrMessageNotMapped)
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return ErrMessageNotMapped
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}
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castMsg, ok := msg.(ssz.Marshaler)
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if !ok {
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return errors.Errorf("message of %T does not support marshaller interface", msg)
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}
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return s.broadcastObject(ctx, castMsg, fmt.Sprintf(topic, forkDigest))
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}
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// BroadcastAttestation broadcasts an attestation to the p2p network, the message is assumed to be
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// broadcasted to the current fork.
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func (s *Service) BroadcastAttestation(ctx context.Context, subnet uint64, att ethpb.Att) error {
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if att == nil {
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return errors.New("attempted to broadcast nil attestation")
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}
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ctx, span := trace.StartSpan(ctx, "p2p.BroadcastAttestation")
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defer span.End()
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forkDigest, err := s.currentForkDigest()
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if err != nil {
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err := errors.Wrap(err, "could not retrieve fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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// Non-blocking broadcast, with attempts to discover a subnet peer if none available.
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go s.internalBroadcastAttestation(ctx, subnet, att, forkDigest)
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return nil
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}
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// BroadcastSyncCommitteeMessage broadcasts a sync committee message to the p2p network, the message is assumed to be
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// broadcasted to the current fork.
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func (s *Service) BroadcastSyncCommitteeMessage(ctx context.Context, subnet uint64, sMsg *ethpb.SyncCommitteeMessage) error {
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if sMsg == nil {
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return errors.New("attempted to broadcast nil sync committee message")
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}
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ctx, span := trace.StartSpan(ctx, "p2p.BroadcastSyncCommitteeMessage")
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defer span.End()
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forkDigest, err := s.currentForkDigest()
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if err != nil {
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err := errors.Wrap(err, "could not retrieve fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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// Non-blocking broadcast, with attempts to discover a subnet peer if none available.
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go s.broadcastSyncCommittee(ctx, subnet, sMsg, forkDigest)
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return nil
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}
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func (s *Service) internalBroadcastAttestation(ctx context.Context, subnet uint64, att ethpb.Att, forkDigest [fieldparams.VersionLength]byte) {
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_, span := trace.StartSpan(ctx, "p2p.internalBroadcastAttestation")
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defer span.End()
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ctx = trace.NewContext(context.Background(), span) // clear parent context / deadline.
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oneEpoch := time.Duration(1*params.BeaconConfig().SlotsPerEpoch.Mul(params.BeaconConfig().SecondsPerSlot)) * time.Second
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ctx, cancel := context.WithTimeout(ctx, oneEpoch)
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defer cancel()
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// Ensure we have peers with this subnet.
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s.subnetLocker(subnet).RLock()
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hasPeer := s.hasPeerWithSubnet(attestationToTopic(subnet, forkDigest))
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s.subnetLocker(subnet).RUnlock()
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span.SetAttributes(
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trace.BoolAttribute("hasPeer", hasPeer),
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trace.Int64Attribute("slot", int64(att.GetData().Slot)), // lint:ignore uintcast -- It's safe to do this for tracing.
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trace.Int64Attribute("subnet", int64(subnet)), // lint:ignore uintcast -- It's safe to do this for tracing.
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)
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if !hasPeer {
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attestationBroadcastAttempts.Inc()
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if err := func() error {
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s.subnetLocker(subnet).Lock()
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defer s.subnetLocker(subnet).Unlock()
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ok, err := s.FindPeersWithSubnet(ctx, attestationToTopic(subnet, forkDigest), subnet, 1)
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if err != nil {
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return err
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}
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if ok {
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savedAttestationBroadcasts.Inc()
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return nil
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}
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return errors.New("failed to find peers for subnet")
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}(); err != nil {
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log.WithError(err).Error("Failed to find peers")
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tracing.AnnotateError(span, err)
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}
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}
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// In the event our attestation is outdated and beyond the
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// acceptable threshold, we exit early and do not broadcast it.
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currSlot := slots.CurrentSlot(uint64(s.genesisTime.Unix()))
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if err := helpers.ValidateAttestationTime(att.GetData().Slot, s.genesisTime, params.BeaconConfig().MaximumGossipClockDisparityDuration()); err != nil {
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log.WithFields(logrus.Fields{
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"attestationSlot": att.GetData().Slot,
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"currentSlot": currSlot,
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}).WithError(err).Debug("Attestation is too old to broadcast, discarding it")
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return
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}
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if err := s.broadcastObject(ctx, att, attestationToTopic(subnet, forkDigest)); err != nil {
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log.WithError(err).Error("Failed to broadcast attestation")
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tracing.AnnotateError(span, err)
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}
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}
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func (s *Service) broadcastSyncCommittee(ctx context.Context, subnet uint64, sMsg *ethpb.SyncCommitteeMessage, forkDigest [fieldparams.VersionLength]byte) {
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_, span := trace.StartSpan(ctx, "p2p.broadcastSyncCommittee")
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defer span.End()
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ctx = trace.NewContext(context.Background(), span) // clear parent context / deadline.
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oneSlot := time.Duration(1*params.BeaconConfig().SecondsPerSlot) * time.Second
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ctx, cancel := context.WithTimeout(ctx, oneSlot)
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defer cancel()
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// Ensure we have peers with this subnet.
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// This adds in a special value to the subnet
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// to ensure that we can reuse the same subnet locker.
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wrappedSubIdx := subnet + syncLockerVal
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s.subnetLocker(wrappedSubIdx).RLock()
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hasPeer := s.hasPeerWithSubnet(syncCommitteeToTopic(subnet, forkDigest))
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s.subnetLocker(wrappedSubIdx).RUnlock()
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span.SetAttributes(
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trace.BoolAttribute("hasPeer", hasPeer),
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trace.Int64Attribute("slot", int64(sMsg.Slot)), // lint:ignore uintcast -- It's safe to do this for tracing.
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trace.Int64Attribute("subnet", int64(subnet)), // lint:ignore uintcast -- It's safe to do this for tracing.
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)
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if !hasPeer {
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syncCommitteeBroadcastAttempts.Inc()
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if err := func() error {
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s.subnetLocker(wrappedSubIdx).Lock()
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defer s.subnetLocker(wrappedSubIdx).Unlock()
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ok, err := s.FindPeersWithSubnet(ctx, syncCommitteeToTopic(subnet, forkDigest), subnet, 1)
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if err != nil {
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return err
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}
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if ok {
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savedSyncCommitteeBroadcasts.Inc()
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return nil
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}
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return errors.New("failed to find peers for subnet")
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}(); err != nil {
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log.WithError(err).Error("Failed to find peers")
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tracing.AnnotateError(span, err)
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}
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}
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// In the event our sync message is outdated and beyond the
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// acceptable threshold, we exit early and do not broadcast it.
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if err := altair.ValidateSyncMessageTime(sMsg.Slot, s.genesisTime, params.BeaconConfig().MaximumGossipClockDisparityDuration()); err != nil {
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log.WithError(err).Warn("Sync Committee Message is too old to broadcast, discarding it")
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return
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}
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if err := s.broadcastObject(ctx, sMsg, syncCommitteeToTopic(subnet, forkDigest)); err != nil {
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log.WithError(err).Error("Failed to broadcast sync committee message")
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tracing.AnnotateError(span, err)
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}
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}
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// BroadcastBlob broadcasts a blob to the p2p network, the message is assumed to be
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// broadcasted to the current fork and to the input subnet.
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func (s *Service) BroadcastBlob(ctx context.Context, subnet uint64, blob *ethpb.BlobSidecar) error {
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ctx, span := trace.StartSpan(ctx, "p2p.BroadcastBlob")
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defer span.End()
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if blob == nil {
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return errors.New("attempted to broadcast nil blob sidecar")
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}
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forkDigest, err := s.currentForkDigest()
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if err != nil {
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err := errors.Wrap(err, "could not retrieve fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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// Non-blocking broadcast, with attempts to discover a subnet peer if none available.
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go s.internalBroadcastBlob(ctx, subnet, blob, forkDigest)
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return nil
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}
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func (s *Service) internalBroadcastBlob(ctx context.Context, subnet uint64, blobSidecar *ethpb.BlobSidecar, forkDigest [fieldparams.VersionLength]byte) {
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_, span := trace.StartSpan(ctx, "p2p.internalBroadcastBlob")
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defer span.End()
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ctx = trace.NewContext(context.Background(), span) // clear parent context / deadline.
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oneSlot := time.Duration(params.BeaconConfig().SecondsPerSlot) * time.Second
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ctx, cancel := context.WithTimeout(ctx, oneSlot)
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defer cancel()
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wrappedSubIdx := subnet + blobSubnetLockerVal
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s.subnetLocker(wrappedSubIdx).RLock()
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hasPeer := s.hasPeerWithSubnet(blobSubnetToTopic(subnet, forkDigest))
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s.subnetLocker(wrappedSubIdx).RUnlock()
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if !hasPeer {
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blobSidecarBroadcastAttempts.Inc()
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if err := func() error {
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s.subnetLocker(wrappedSubIdx).Lock()
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defer s.subnetLocker(wrappedSubIdx).Unlock()
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ok, err := s.FindPeersWithSubnet(ctx, blobSubnetToTopic(subnet, forkDigest), subnet, 1)
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if err != nil {
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return err
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}
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if ok {
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blobSidecarBroadcasts.Inc()
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return nil
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}
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return errors.New("failed to find peers for subnet")
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}(); err != nil {
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log.WithError(err).Error("Failed to find peers")
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tracing.AnnotateError(span, err)
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}
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}
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if err := s.broadcastObject(ctx, blobSidecar, blobSubnetToTopic(subnet, forkDigest)); err != nil {
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log.WithError(err).Error("Failed to broadcast blob sidecar")
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tracing.AnnotateError(span, err)
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}
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}
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func (s *Service) BroadcastLightClientOptimisticUpdate(ctx context.Context, update interfaces.LightClientOptimisticUpdate) error {
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ctx, span := trace.StartSpan(ctx, "p2p.BroadcastLightClientOptimisticUpdate")
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defer span.End()
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if update == nil || update.IsNil() {
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return errors.New("attempted to broadcast nil light client optimistic update")
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}
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forkDigest, err := forks.ForkDigestFromEpoch(slots.ToEpoch(update.AttestedHeader().Beacon().Slot), s.genesisValidatorsRoot)
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if err != nil {
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err := errors.Wrap(err, "could not retrieve fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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if err := s.broadcastObject(ctx, update, lcOptimisticToTopic(forkDigest)); err != nil {
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log.WithError(err).Debug("Failed to broadcast light client optimistic update")
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err := errors.Wrap(err, "could not publish message")
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tracing.AnnotateError(span, err)
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return err
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}
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log.Debug("Successfully broadcast light client optimistic update")
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return nil
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}
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func (s *Service) BroadcastLightClientFinalityUpdate(ctx context.Context, update interfaces.LightClientFinalityUpdate) error {
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ctx, span := trace.StartSpan(ctx, "p2p.BroadcastLightClientFinalityUpdate")
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defer span.End()
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if update == nil || update.IsNil() {
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return errors.New("attempted to broadcast nil light client finality update")
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}
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forkDigest, err := forks.ForkDigestFromEpoch(slots.ToEpoch(update.AttestedHeader().Beacon().Slot), s.genesisValidatorsRoot)
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if err != nil {
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err := errors.Wrap(err, "could not retrieve fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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if err := s.broadcastObject(ctx, update, lcFinalityToTopic(forkDigest)); err != nil {
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log.WithError(err).Debug("Failed to broadcast light client finality update")
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err := errors.Wrap(err, "could not publish message")
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tracing.AnnotateError(span, err)
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return err
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}
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log.Debug("Successfully broadcast light client finality update")
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return nil
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}
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// BroadcastDataColumn broadcasts a data column to the p2p network, the message is assumed to be
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// broadcasted to the current fork and to the input column subnet.
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func (s *Service) BroadcastDataColumn(
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root [fieldparams.RootLength]byte,
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dataColumnSubnet uint64,
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dataColumnSidecar *ethpb.DataColumnSidecar,
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peersCheckedChans ...chan<- bool, // Used for testing purposes to signal when peers are checked.
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) error {
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// Add tracing to the function.
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ctx, span := trace.StartSpan(s.ctx, "p2p.BroadcastDataColumn")
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defer span.End()
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// Ensure the data column sidecar is not nil.
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if dataColumnSidecar == nil {
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return errors.Errorf("attempted to broadcast nil data column sidecar at subnet %d", dataColumnSubnet)
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}
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// Retrieve the current fork digest.
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forkDigest, err := s.currentForkDigest()
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if err != nil {
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err := errors.Wrap(err, "current fork digest")
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tracing.AnnotateError(span, err)
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return err
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}
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// Non-blocking broadcast, with attempts to discover a column subnet peer if none available.
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go s.internalBroadcastDataColumn(ctx, root, dataColumnSubnet, dataColumnSidecar, forkDigest, peersCheckedChans)
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return nil
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}
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func (s *Service) internalBroadcastDataColumn(
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ctx context.Context,
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root [fieldparams.RootLength]byte,
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columnSubnet uint64,
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dataColumnSidecar *ethpb.DataColumnSidecar,
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forkDigest [fieldparams.VersionLength]byte,
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peersCheckedChans []chan<- bool, // Used for testing purposes to signal when peers are checked.
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) {
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// Add tracing to the function.
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_, span := trace.StartSpan(ctx, "p2p.internalBroadcastDataColumn")
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defer span.End()
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// Increase the number of broadcast attempts.
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dataColumnSidecarBroadcastAttempts.Inc()
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// Define a one-slot length context timeout.
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secondsPerSlot := params.BeaconConfig().SecondsPerSlot
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oneSlot := time.Duration(secondsPerSlot) * time.Second
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ctx, cancel := context.WithTimeout(ctx, oneSlot)
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defer cancel()
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// Build the topic corresponding to this column subnet and this fork digest.
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topic := dataColumnSubnetToTopic(columnSubnet, forkDigest)
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// Compute the wrapped subnet index.
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wrappedSubIdx := columnSubnet + dataColumnSubnetVal
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// Find peers if needed.
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if err := s.findPeersIfNeeded(ctx, wrappedSubIdx, topic, columnSubnet, peersCheckedChans); err != nil {
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log.WithError(err).Error("Failed to find peers for data column subnet")
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tracing.AnnotateError(span, err)
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}
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// Broadcast the data column sidecar to the network.
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if err := s.broadcastObject(ctx, dataColumnSidecar, topic); err != nil {
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log.WithError(err).Error("Failed to broadcast data column sidecar")
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tracing.AnnotateError(span, err)
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return
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}
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header := dataColumnSidecar.SignedBlockHeader.GetHeader()
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slot := header.GetSlot()
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slotStartTime, err := slots.ToTime(uint64(s.genesisTime.Unix()), slot)
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if err != nil {
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log.WithError(err).Error("Failed to convert slot to time")
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}
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log.WithFields(logrus.Fields{
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"slot": slot,
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"timeSinceSlotStart": time.Since(slotStartTime),
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"root": fmt.Sprintf("%#x", root),
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"columnSubnet": columnSubnet,
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}).Debug("Broadcasted data column sidecar")
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// Increase the number of successful broadcasts.
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dataColumnSidecarBroadcasts.Inc()
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}
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func (s *Service) findPeersIfNeeded(
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ctx context.Context,
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wrappedSubIdx uint64,
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topic string,
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subnet uint64,
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peersCheckedChans []chan<- bool, // Used for testing purposes to signal when peers are checked.
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) error {
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s.subnetLocker(wrappedSubIdx).Lock()
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defer s.subnetLocker(wrappedSubIdx).Unlock()
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// Sending a data column sidecar to only one peer is not ideal,
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// but it ensures at least one peer receives it.
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const peerCount = 1
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if s.hasPeerWithSubnet(topic) {
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// Exit early if we already have peers with this subnet.
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return nil
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}
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// Used for testing purposes.
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if len(peersCheckedChans) > 0 {
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peersCheckedChans[0] <- true
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}
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// No peers found, attempt to find peers with this subnet.
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ok, err := s.FindPeersWithSubnet(ctx, topic, subnet, peerCount)
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if err != nil {
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return errors.Wrap(err, "find peers with subnet")
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}
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if !ok {
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return errors.Errorf("failed to find peers for topic %s with subnet %d", topic, subnet)
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}
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return nil
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}
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// method to broadcast messages to other peers in our gossip mesh.
|
|
func (s *Service) broadcastObject(ctx context.Context, obj ssz.Marshaler, topic string) error {
|
|
ctx, span := trace.StartSpan(ctx, "p2p.broadcastObject")
|
|
defer span.End()
|
|
|
|
span.SetAttributes(trace.StringAttribute("topic", topic))
|
|
|
|
buf := new(bytes.Buffer)
|
|
if _, err := s.Encoding().EncodeGossip(buf, obj); err != nil {
|
|
err := errors.Wrap(err, "could not encode message")
|
|
tracing.AnnotateError(span, err)
|
|
return err
|
|
}
|
|
|
|
if span.IsRecording() {
|
|
id := hash.FastSum64(buf.Bytes())
|
|
messageLen := int64(buf.Len())
|
|
// lint:ignore uintcast -- It's safe to do this for tracing.
|
|
iid := int64(id)
|
|
span = trace.AddMessageSendEvent(span, iid, messageLen /*uncompressed*/, messageLen /*compressed*/)
|
|
}
|
|
if err := s.PublishToTopic(ctx, topic+s.Encoding().ProtocolSuffix(), buf.Bytes()); err != nil {
|
|
err := errors.Wrap(err, "could not publish message")
|
|
tracing.AnnotateError(span, err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func attestationToTopic(subnet uint64, forkDigest [fieldparams.VersionLength]byte) string {
|
|
return fmt.Sprintf(AttestationSubnetTopicFormat, forkDigest, subnet)
|
|
}
|
|
|
|
func syncCommitteeToTopic(subnet uint64, forkDigest [fieldparams.VersionLength]byte) string {
|
|
return fmt.Sprintf(SyncCommitteeSubnetTopicFormat, forkDigest, subnet)
|
|
}
|
|
|
|
func blobSubnetToTopic(subnet uint64, forkDigest [fieldparams.VersionLength]byte) string {
|
|
return fmt.Sprintf(BlobSubnetTopicFormat, forkDigest, subnet)
|
|
}
|
|
|
|
func lcOptimisticToTopic(forkDigest [4]byte) string {
|
|
return fmt.Sprintf(LightClientOptimisticUpdateTopicFormat, forkDigest)
|
|
}
|
|
|
|
func lcFinalityToTopic(forkDigest [4]byte) string {
|
|
return fmt.Sprintf(LightClientFinalityUpdateTopicFormat, forkDigest)
|
|
}
|
|
|
|
func dataColumnSubnetToTopic(subnet uint64, forkDigest [fieldparams.VersionLength]byte) string {
|
|
return fmt.Sprintf(DataColumnSubnetTopicFormat, forkDigest, subnet)
|
|
}
|