mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 12:57:18 +00:00
121 lines
4.4 KiB
Go
121 lines
4.4 KiB
Go
package blockchain
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import (
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"context"
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"encoding/hex"
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"time"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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ethpb "github.com/prysmaticlabs/prysm/proto/eth/v1alpha1"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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"github.com/sirupsen/logrus"
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"go.opencensus.io/trace"
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)
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// AttestationReceiver interface defines the methods of chain service receive and processing new attestations.
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type AttestationReceiver interface {
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ReceiveAttestation(ctx context.Context, att *ethpb.Attestation) error
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ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error
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}
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// ReceiveAttestation is a function that defines the operations that are preformed on
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// attestation that is received from regular sync. The operations consist of:
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// 1. Gossip attestation to other peers
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// 2. Validate attestation, update validator's latest vote
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// 3. Apply fork choice to the processed attestation
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// 4. Save latest head info
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func (c *ChainService) ReceiveAttestation(ctx context.Context, att *ethpb.Attestation) error {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveAttestation")
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defer span.End()
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// Broadcast the new attestation to the network.
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if err := c.p2p.Broadcast(ctx, att); err != nil {
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return errors.Wrap(err, "could not broadcast attestation")
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}
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log.WithFields(logrus.Fields{
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"attDataRoot": hex.EncodeToString(att.Data.BeaconBlockRoot),
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}).Debug("Broadcasting attestation")
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if err := c.ReceiveAttestationNoPubsub(ctx, att); err != nil {
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return err
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}
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processedAtt.Inc()
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return nil
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}
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// ReceiveAttestationNoPubsub is a function that defines the operations that are preformed on
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// attestation that is received from regular sync. The operations consist of:
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// 1. Validate attestation, update validator's latest vote
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// 2. Apply fork choice to the processed attestation
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// 3. Save latest head info
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func (c *ChainService) ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveAttestationNoPubsub")
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defer span.End()
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// Delay attestation inclusion until the attested slot is in the past.
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slot, err := c.waitForAttInclDelay(ctx, att)
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if err != nil {
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return errors.Wrap(err, "could not delay attestation inclusion")
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}
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// Update forkchoice store for the new attestation
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if err := c.forkChoiceStore.OnAttestation(ctx, att); err != nil {
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return errors.Wrap(err, "could not process block from fork choice service")
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}
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log.WithFields(logrus.Fields{
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"attSlot": slot,
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"attDataRoot": hex.EncodeToString(att.Data.BeaconBlockRoot),
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}).Debug("Finished updating fork choice store for attestation")
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// Run fork choice for head block after updating fork choice store.
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headRoot, err := c.forkChoiceStore.Head(ctx)
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if err != nil {
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return errors.Wrap(err, "could not get head from fork choice service")
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}
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headBlk, err := c.beaconDB.Block(ctx, bytesutil.ToBytes32(headRoot))
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if err != nil {
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return errors.Wrap(err, "could not compute state from block head")
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}
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log.WithFields(logrus.Fields{
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"headSlot": headBlk.Slot,
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"headRoot": hex.EncodeToString(headRoot),
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}).Debug("Finished applying fork choice")
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isCompetingAtts(att.Data.BeaconBlockRoot[:], headRoot)
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// Save head info after running fork choice.
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if err := c.saveHead(ctx, headBlk, bytesutil.ToBytes32(headRoot)); err != nil {
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return errors.Wrap(err, "could not save head")
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}
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processedAttNoPubsub.Inc()
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return nil
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}
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// waitForAttInclDelay waits until the next slot because attestation can only affect
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// fork choice of subsequent slot. This is to delay attestation inclusion for fork choice
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// until the attested slot is in the past.
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func (c *ChainService) waitForAttInclDelay(ctx context.Context, a *ethpb.Attestation) (uint64, error) {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.forkchoice.waitForAttInclDelay")
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defer span.End()
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s, err := c.beaconDB.State(ctx, bytesutil.ToBytes32(a.Data.Target.Root))
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if err != nil {
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return 0, errors.Wrap(err, "could not get state")
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}
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slot, err := helpers.AttestationDataSlot(s, a.Data)
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if err != nil {
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return 0, errors.Wrap(err, "could not get attestation slot")
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}
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nextSlot := slot + 1
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duration := time.Duration(nextSlot*params.BeaconConfig().SecondsPerSlot) * time.Second
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timeToInclude := time.Unix(int64(s.GenesisTime), 0).Add(duration)
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time.Sleep(time.Until(timeToInclude))
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return slot, nil
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}
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