/
events.go
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/
events.go
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package events
import (
"strings"
gwpb "github.com/grpc-ecosystem/grpc-gateway/v2/proto/gateway"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed/operation"
statefeed "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed/state"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/time"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
enginev1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
ethpbservice "github.com/prysmaticlabs/prysm/v4/proto/eth/service"
ethpb "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
"github.com/prysmaticlabs/prysm/v4/proto/migration"
"github.com/prysmaticlabs/prysm/v4/runtime/version"
"github.com/prysmaticlabs/prysm/v4/time/slots"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
)
const (
// HeadTopic represents a new chain head event topic.
HeadTopic = "head"
// BlockTopic represents a new produced block event topic.
BlockTopic = "block"
// AttestationTopic represents a new submitted attestation event topic.
AttestationTopic = "attestation"
// VoluntaryExitTopic represents a new performed voluntary exit event topic.
VoluntaryExitTopic = "voluntary_exit"
// FinalizedCheckpointTopic represents a new finalized checkpoint event topic.
FinalizedCheckpointTopic = "finalized_checkpoint"
// ChainReorgTopic represents a chain reorganization event topic.
ChainReorgTopic = "chain_reorg"
// SyncCommitteeContributionTopic represents a new sync committee contribution event topic.
SyncCommitteeContributionTopic = "contribution_and_proof"
// BLSToExecutionChangeTopic represents a new received BLS to execution change event topic.
BLSToExecutionChangeTopic = "bls_to_execution_change"
// PayloadAttributesTopic represents a new payload attributes for execution payload building event topic.
PayloadAttributesTopic = "payload_attributes"
// BlobSidecarTopic represents a new blob sidecar event topic
BlobSidecarTopic = "blob_sidecar"
)
var casesHandled = map[string]bool{
HeadTopic: true,
BlockTopic: true,
AttestationTopic: true,
VoluntaryExitTopic: true,
FinalizedCheckpointTopic: true,
ChainReorgTopic: true,
SyncCommitteeContributionTopic: true,
BLSToExecutionChangeTopic: true,
PayloadAttributesTopic: true,
BlobSidecarTopic: true,
}
// StreamEvents allows requesting all events from a set of topics defined in the Ethereum consensus API standard.
// The topics supported include block events, attestations, chain reorgs, voluntary exits,
// chain finality, and more.
func (s *Server) StreamEvents(
req *ethpb.StreamEventsRequest, stream ethpbservice.Events_StreamEventsServer,
) error {
if req == nil || len(req.Topics) == 0 {
return status.Error(codes.InvalidArgument, "No topics specified to subscribe to")
}
// Check if the topics in the request are valid.
requestedTopics := make(map[string]bool)
for _, rawTopic := range req.Topics {
splitTopic := strings.Split(rawTopic, ",")
for _, topic := range splitTopic {
if _, ok := casesHandled[topic]; !ok {
return status.Errorf(codes.InvalidArgument, "Topic %s not allowed for event subscriptions", topic)
}
requestedTopics[topic] = true
}
}
// Subscribe to event feeds from information received in the beacon node runtime.
opsChan := make(chan *feed.Event, 1)
opsSub := s.OperationNotifier.OperationFeed().Subscribe(opsChan)
stateChan := make(chan *feed.Event, 1)
stateSub := s.StateNotifier.StateFeed().Subscribe(stateChan)
defer opsSub.Unsubscribe()
defer stateSub.Unsubscribe()
// Handle each event received and context cancelation.
for {
select {
case event := <-opsChan:
if err := handleBlockOperationEvents(stream, requestedTopics, event); err != nil {
return status.Errorf(codes.Internal, "Could not handle block operations event: %v", err)
}
case event := <-stateChan:
if err := s.handleStateEvents(stream, requestedTopics, event); err != nil {
return status.Errorf(codes.Internal, "Could not handle state event: %v", err)
}
case <-s.Ctx.Done():
return status.Errorf(codes.Canceled, "Context canceled")
case <-stream.Context().Done():
return status.Errorf(codes.Canceled, "Context canceled")
}
}
}
func handleBlockOperationEvents(
stream ethpbservice.Events_StreamEventsServer, requestedTopics map[string]bool, event *feed.Event,
) error {
switch event.Type {
case operation.AggregatedAttReceived:
if _, ok := requestedTopics[AttestationTopic]; !ok {
return nil
}
attData, ok := event.Data.(*operation.AggregatedAttReceivedData)
if !ok {
return nil
}
v1Data := migration.V1Alpha1AggregateAttAndProofToV1(attData.Attestation)
return streamData(stream, AttestationTopic, v1Data)
case operation.UnaggregatedAttReceived:
if _, ok := requestedTopics[AttestationTopic]; !ok {
return nil
}
attData, ok := event.Data.(*operation.UnAggregatedAttReceivedData)
if !ok {
return nil
}
v1Data := migration.V1Alpha1AttestationToV1(attData.Attestation)
return streamData(stream, AttestationTopic, v1Data)
case operation.ExitReceived:
if _, ok := requestedTopics[VoluntaryExitTopic]; !ok {
return nil
}
exitData, ok := event.Data.(*operation.ExitReceivedData)
if !ok {
return nil
}
v1Data := migration.V1Alpha1ExitToV1(exitData.Exit)
return streamData(stream, VoluntaryExitTopic, v1Data)
case operation.SyncCommitteeContributionReceived:
if _, ok := requestedTopics[SyncCommitteeContributionTopic]; !ok {
return nil
}
contributionData, ok := event.Data.(*operation.SyncCommitteeContributionReceivedData)
if !ok {
return nil
}
v2Data := migration.V1Alpha1SignedContributionAndProofToV2(contributionData.Contribution)
return streamData(stream, SyncCommitteeContributionTopic, v2Data)
case operation.BLSToExecutionChangeReceived:
if _, ok := requestedTopics[BLSToExecutionChangeTopic]; !ok {
return nil
}
changeData, ok := event.Data.(*operation.BLSToExecutionChangeReceivedData)
if !ok {
return nil
}
v2Change := migration.V1Alpha1SignedBLSToExecChangeToV2(changeData.Change)
return streamData(stream, BLSToExecutionChangeTopic, v2Change)
case operation.BlobSidecarReceived:
if _, ok := requestedTopics[BlobSidecarTopic]; !ok {
return nil
}
blobData, ok := event.Data.(*operation.BlobSidecarReceivedData)
if !ok {
return nil
}
if blobData == nil || blobData.Blob == nil {
return nil
}
versionedHash := blockchain.ConvertKzgCommitmentToVersionedHash(blobData.Blob.Message.KzgCommitment)
blobEvent := ðpb.EventBlobSidecar{
BlockRoot: bytesutil.SafeCopyBytes(blobData.Blob.Message.BlockRoot),
Index: blobData.Blob.Message.Index,
Slot: blobData.Blob.Message.Slot,
VersionedHash: bytesutil.SafeCopyBytes(versionedHash.Bytes()),
KzgCommitment: bytesutil.SafeCopyBytes(blobData.Blob.Message.KzgCommitment),
}
return streamData(stream, BlobSidecarTopic, blobEvent)
default:
return nil
}
}
func (s *Server) handleStateEvents(
stream ethpbservice.Events_StreamEventsServer, requestedTopics map[string]bool, event *feed.Event,
) error {
switch event.Type {
case statefeed.NewHead:
if _, ok := requestedTopics[HeadTopic]; ok {
head, ok := event.Data.(*ethpb.EventHead)
if !ok {
return nil
}
return streamData(stream, HeadTopic, head)
}
if _, ok := requestedTopics[PayloadAttributesTopic]; ok {
if err := s.streamPayloadAttributes(stream); err != nil {
log.WithError(err).Error("Unable to obtain stream payload attributes")
}
return nil
}
return nil
case statefeed.MissedSlot:
if _, ok := requestedTopics[PayloadAttributesTopic]; ok {
if err := s.streamPayloadAttributes(stream); err != nil {
log.WithError(err).Error("Unable to obtain stream payload attributes")
}
return nil
}
return nil
case statefeed.FinalizedCheckpoint:
if _, ok := requestedTopics[FinalizedCheckpointTopic]; !ok {
return nil
}
finalizedCheckpoint, ok := event.Data.(*ethpb.EventFinalizedCheckpoint)
if !ok {
return nil
}
return streamData(stream, FinalizedCheckpointTopic, finalizedCheckpoint)
case statefeed.Reorg:
if _, ok := requestedTopics[ChainReorgTopic]; !ok {
return nil
}
reorg, ok := event.Data.(*ethpb.EventChainReorg)
if !ok {
return nil
}
return streamData(stream, ChainReorgTopic, reorg)
case statefeed.BlockProcessed:
if _, ok := requestedTopics[BlockTopic]; !ok {
return nil
}
blkData, ok := event.Data.(*statefeed.BlockProcessedData)
if !ok {
return nil
}
v1Data, err := migration.BlockIfaceToV1BlockHeader(blkData.SignedBlock)
if err != nil {
return err
}
item, err := v1Data.Message.HashTreeRoot()
if err != nil {
return errors.Wrap(err, "could not hash tree root block")
}
eventBlock := ðpb.EventBlock{
Slot: blkData.Slot,
Block: item[:],
ExecutionOptimistic: blkData.Optimistic,
}
return streamData(stream, BlockTopic, eventBlock)
default:
return nil
}
}
// streamPayloadAttributes on new head event.
// This event stream is intended to be used by builders and relays.
// parent_ fields are based on state at N_{current_slot}, while the rest of fields are based on state of N_{current_slot + 1}
func (s *Server) streamPayloadAttributes(stream ethpbservice.Events_StreamEventsServer) error {
headRoot, err := s.HeadFetcher.HeadRoot(s.Ctx)
if err != nil {
return errors.Wrap(err, "could not get head root")
}
st, err := s.HeadFetcher.HeadState(s.Ctx)
if err != nil {
return errors.Wrap(err, "could not get head state")
}
// advance the headstate
headState, err := transition.ProcessSlotsIfPossible(s.Ctx, st, s.ChainInfoFetcher.CurrentSlot()+1)
if err != nil {
return err
}
headBlock, err := s.HeadFetcher.HeadBlock(s.Ctx)
if err != nil {
return err
}
headPayload, err := headBlock.Block().Body().Execution()
if err != nil {
return err
}
t, err := slots.ToTime(headState.GenesisTime(), headState.Slot())
if err != nil {
return err
}
prevRando, err := helpers.RandaoMix(headState, time.CurrentEpoch(headState))
if err != nil {
return err
}
proposerIndex, err := helpers.BeaconProposerIndex(s.Ctx, headState)
if err != nil {
return err
}
switch headState.Version() {
case version.Bellatrix:
return streamData(stream, PayloadAttributesTopic, ðpb.EventPayloadAttributeV1{
Version: version.String(headState.Version()),
Data: ðpb.EventPayloadAttributeV1_BasePayloadAttribute{
ProposerIndex: proposerIndex,
ProposalSlot: headState.Slot(),
ParentBlockNumber: headPayload.BlockNumber(),
ParentBlockRoot: headRoot,
ParentBlockHash: headPayload.BlockHash(),
PayloadAttributes: &enginev1.PayloadAttributes{
Timestamp: uint64(t.Unix()),
PrevRandao: prevRando,
SuggestedFeeRecipient: headPayload.FeeRecipient(),
},
},
})
case version.Capella, version.Deneb:
withdrawals, err := headState.ExpectedWithdrawals()
if err != nil {
return err
}
return streamData(stream, PayloadAttributesTopic, ðpb.EventPayloadAttributeV2{
Version: version.String(headState.Version()),
Data: ðpb.EventPayloadAttributeV2_BasePayloadAttribute{
ProposerIndex: proposerIndex,
ProposalSlot: headState.Slot(),
ParentBlockNumber: headPayload.BlockNumber(),
ParentBlockRoot: headRoot,
ParentBlockHash: headPayload.BlockHash(),
PayloadAttributes: &enginev1.PayloadAttributesV2{
Timestamp: uint64(t.Unix()),
PrevRandao: prevRando,
SuggestedFeeRecipient: headPayload.FeeRecipient(),
Withdrawals: withdrawals,
},
},
})
default:
return errors.New("payload version is not supported")
}
}
func streamData(stream ethpbservice.Events_StreamEventsServer, name string, data proto.Message) error {
returnData, err := anypb.New(data)
if err != nil {
return err
}
return stream.Send(&gwpb.EventSource{
Event: name,
Data: returnData,
})
}