mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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110 lines
3.2 KiB
Go
110 lines
3.2 KiB
Go
// Package attestation defines the life-cycle and status of single and aggregated attestation.
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package attestation
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import (
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"context"
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"fmt"
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"github.com/ethereum/go-ethereum/event"
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"github.com/prysmaticlabs/prysm/beacon-chain/types"
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"github.com/sirupsen/logrus"
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)
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var log = logrus.WithField("prefix", "attestation")
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// Service represents a service that handles the internal
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// logic of managing aggregated attestation.
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type Service struct {
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ctx context.Context
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cancel context.CancelFunc
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handler *Handler
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broadcastFeed *event.Feed
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broadcastChan chan *types.Attestation
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incomingFeed *event.Feed
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incomingChan chan *types.Attestation
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}
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// Config options for the service.
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type Config struct {
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Handler *Handler
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ReceiveAttestationBuf int
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BroadcastAttestationBuf int
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}
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// NewAttestService instantiates a new service instance that will
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// be registered into a running beacon node.
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func NewAttestService(ctx context.Context, cfg *Config) *Service {
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ctx, cancel := context.WithCancel(ctx)
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return &Service{
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ctx: ctx,
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cancel: cancel,
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handler: cfg.Handler,
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broadcastFeed: new(event.Feed),
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broadcastChan: make(chan *types.Attestation, cfg.BroadcastAttestationBuf),
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incomingFeed: new(event.Feed),
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incomingChan: make(chan *types.Attestation, cfg.ReceiveAttestationBuf),
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}
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}
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// Start an attestation service's main event loop.
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func (a *Service) Start() {
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log.Info("Starting service")
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go a.aggregateAttestations()
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}
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// Stop the Attestation service's main event loop and associated goroutines.
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func (a *Service) Stop() error {
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defer a.cancel()
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log.Info("Stopping service")
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return nil
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}
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// IncomingAttestationFeed returns a feed that any service can send incoming p2p attestations into.
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// The attestation service will subscribe to this feed in order to relay incoming attestations.
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func (a *Service) IncomingAttestationFeed() *event.Feed {
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return a.incomingFeed
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}
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// ContainsAttestation checks if an attestation has already been received and aggregated.
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func (a *Service) ContainsAttestation(bitfield []byte, hash [32]byte) (bool, error) {
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attestation, err := a.handler.getAttestation(hash)
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if err != nil {
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return false, fmt.Errorf("could not get attestation from DB: %v", err)
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}
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savedAttestationBitfield := attestation.AttesterBitfield()
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for i := 0; i < len(bitfield); i++ {
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if bitfield[i]&savedAttestationBitfield[i] != 0 {
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return true, nil
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}
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}
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return false, nil
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}
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// aggregateAttestations aggregates the newly broadcasted attestation that was
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// received from sync service.
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func (a *Service) aggregateAttestations() {
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incomingSub := a.incomingFeed.Subscribe(a.incomingChan)
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defer incomingSub.Unsubscribe()
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for {
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select {
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case <-a.ctx.Done():
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log.Debug("Attestation service context closed, exiting goroutine")
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return
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// Listen for a newly received incoming attestation from the sync service.
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case attestation := <-a.incomingChan:
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h, err := attestation.Hash()
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if err != nil {
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log.Errorf("Could not hash incoming attestation: %v", err)
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continue
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}
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if err := a.handler.saveAttestation(attestation); err != nil {
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log.Errorf("Could not save attestation: %v", err)
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continue
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}
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log.Infof("Forwarding aggregated attestation 0x%x to proposers through grpc", h)
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}
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}
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}
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