prysm-pulse/beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go

package validator

import (
	"context"
	"encoding/hex"
	"fmt"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	emptypb "github.com/golang/protobuf/ptypes/empty"
	"github.com/pkg/errors"
	"github.com/prysmaticlabs/prysm/v3/beacon-chain/builder"
	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/feed"
	blockfeed "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/feed/block"
	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/transition"
	"github.com/prysmaticlabs/prysm/v3/beacon-chain/db/kv"
	"github.com/prysmaticlabs/prysm/v3/config/params"
	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
	"github.com/prysmaticlabs/prysm/v3/time/slots"
	"github.com/sirupsen/logrus"
	"go.opencensus.io/trace"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// eth1DataNotification is a latch to stop flooding logs with the same warning.
var eth1DataNotification bool

const eth1dataTimeout = 2 * time.Second

// GetBeaconBlock is called by a proposer during its assigned slot to request a block to sign
// by passing in the slot and the signed randao reveal of the slot. Returns phase0 beacon blocks
// before the Altair fork epoch and Altair blocks post-fork epoch.
func (vs *Server) GetBeaconBlock(ctx context.Context, req *ethpb.BlockRequest) (*ethpb.GenericBeaconBlock, error) {
	ctx, span := trace.StartSpan(ctx, "ProposerServer.GetBeaconBlock")
	defer span.End()
	span.AddAttributes(trace.Int64Attribute("slot", int64(req.Slot)))
	if slots.ToEpoch(req.Slot) < params.BeaconConfig().AltairForkEpoch {
		blk, err := vs.getPhase0BeaconBlock(ctx, req)
		if err != nil {
			return nil, status.Errorf(codes.Internal, "Could not fetch phase0 beacon block: %v", err)
		}
		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Phase0{Phase0: blk}}, nil
	} else if slots.ToEpoch(req.Slot) < params.BeaconConfig().BellatrixForkEpoch {
		blk, err := vs.getAltairBeaconBlock(ctx, req)
		if err != nil {
			return nil, status.Errorf(codes.Internal, "Could not fetch Altair beacon block: %v", err)
		}
		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Altair{Altair: blk}}, nil
	}

	// An optimistic validator MUST NOT produce a block (i.e., sign across the DOMAIN_BEACON_PROPOSER domain).
	if err := vs.optimisticStatus(ctx); err != nil {
		return nil, err
	}

	return vs.getBellatrixBeaconBlock(ctx, req)
}

// ProposeBeaconBlock is called by a proposer during its assigned slot to create a block in an attempt
// to get it processed by the beacon node as the canonical head.
func (vs *Server) ProposeBeaconBlock(ctx context.Context, req *ethpb.GenericSignedBeaconBlock) (*ethpb.ProposeResponse, error) {
	ctx, span := trace.StartSpan(ctx, "ProposerServer.ProposeBeaconBlock")
	defer span.End()
	blk, err := blocks.NewSignedBeaconBlock(req.Block)
	if err != nil {
		return nil, status.Errorf(codes.InvalidArgument, "Could not decode block: %v", err)
	}
	return vs.proposeGenericBeaconBlock(ctx, blk)
}

// PrepareBeaconProposer caches and updates the fee recipient for the given proposer.
func (vs *Server) PrepareBeaconProposer(
	ctx context.Context, request *ethpb.PrepareBeaconProposerRequest,
) (*emptypb.Empty, error) {
	ctx, span := trace.StartSpan(ctx, "validator.PrepareBeaconProposer")
	defer span.End()
	var feeRecipients []common.Address
	var validatorIndices []types.ValidatorIndex

	newRecipients := make([]*ethpb.PrepareBeaconProposerRequest_FeeRecipientContainer, 0, len(request.Recipients))
	for _, r := range request.Recipients {
		f, err := vs.BeaconDB.FeeRecipientByValidatorID(ctx, r.ValidatorIndex)
		switch {
		case errors.Is(err, kv.ErrNotFoundFeeRecipient):
			newRecipients = append(newRecipients, r)
		case err != nil:
			return nil, status.Errorf(codes.Internal, "Could not get fee recipient by validator index: %v", err)
		default:
		}
		if common.BytesToAddress(r.FeeRecipient) != f {
			newRecipients = append(newRecipients, r)
		}
	}
	if len(newRecipients) == 0 {
		return &emptypb.Empty{}, nil
	}

	for _, recipientContainer := range newRecipients {
		recipient := hexutil.Encode(recipientContainer.FeeRecipient)
		if !common.IsHexAddress(recipient) {
			return nil, status.Errorf(codes.InvalidArgument, fmt.Sprintf("Invalid fee recipient address: %v", recipient))
		}
		feeRecipients = append(feeRecipients, common.BytesToAddress(recipientContainer.FeeRecipient))
		validatorIndices = append(validatorIndices, recipientContainer.ValidatorIndex)
	}
	if err := vs.BeaconDB.SaveFeeRecipientsByValidatorIDs(ctx, validatorIndices, feeRecipients); err != nil {
		return nil, status.Errorf(codes.Internal, "Could not save fee recipients: %v", err)
	}
	log.WithFields(logrus.Fields{
		"validatorIndices": validatorIndices,
	}).Info("Updated fee recipient addresses for validator indices")
	return &emptypb.Empty{}, nil
}

func (vs *Server) proposeGenericBeaconBlock(ctx context.Context, blk interfaces.SignedBeaconBlock) (*ethpb.ProposeResponse, error) {
	ctx, span := trace.StartSpan(ctx, "ProposerServer.proposeGenericBeaconBlock")
	defer span.End()
	root, err := blk.Block().HashTreeRoot()
	if err != nil {
		return nil, fmt.Errorf("could not tree hash block: %v", err)
	}

	blk, err = vs.unblindBuilderBlock(ctx, blk)
	if err != nil {
		return nil, err
	}

	// Do not block proposal critical path with debug logging or block feed updates.
	defer func() {
		log.WithField("blockRoot", fmt.Sprintf("%#x", bytesutil.Trunc(root[:]))).Debugf(
			"Block proposal received via RPC")
		vs.BlockNotifier.BlockFeed().Send(&feed.Event{
			Type: blockfeed.ReceivedBlock,
			Data: &blockfeed.ReceivedBlockData{SignedBlock: blk},
		})
	}()

	// Broadcast the new block to the network.
	blkPb, err := blk.Proto()
	if err != nil {
		return nil, errors.Wrap(err, "could not get protobuf block")
	}
	if err := vs.P2P.Broadcast(ctx, blkPb); err != nil {
		return nil, fmt.Errorf("could not broadcast block: %v", err)
	}
	log.WithFields(logrus.Fields{
		"blockRoot": hex.EncodeToString(root[:]),
	}).Debug("Broadcasting block")

	if err := vs.BlockReceiver.ReceiveBlock(ctx, blk, root); err != nil {
		return nil, fmt.Errorf("could not process beacon block: %v", err)
	}

	return &ethpb.ProposeResponse{
		BlockRoot: root[:],
	}, nil
}

// computeStateRoot computes the state root after a block has been processed through a state transition and
// returns it to the validator client.
func (vs *Server) computeStateRoot(ctx context.Context, block interfaces.SignedBeaconBlock) ([]byte, error) {
	beaconState, err := vs.StateGen.StateByRoot(ctx, bytesutil.ToBytes32(block.Block().ParentRoot()))
	if err != nil {
		return nil, errors.Wrap(err, "could not retrieve beacon state")
	}
	root, err := transition.CalculateStateRoot(
		ctx,
		beaconState,
		block,
	)
	if err != nil {
		return nil, errors.Wrapf(err, "could not calculate state root at slot %d", beaconState.Slot())
	}

	log.WithField("beaconStateRoot", fmt.Sprintf("%#x", root)).Debugf("Computed state root")
	return root[:], nil
}

// SubmitValidatorRegistrations submits validator registrations.
func (vs *Server) SubmitValidatorRegistrations(ctx context.Context, reg *ethpb.SignedValidatorRegistrationsV1) (*emptypb.Empty, error) {
	if vs.BlockBuilder == nil || !vs.BlockBuilder.Configured() {
		return &emptypb.Empty{}, status.Errorf(codes.InvalidArgument, "Could not register block builder: %v", builder.ErrNoBuilder)
	}

	if err := vs.BlockBuilder.RegisterValidator(ctx, reg.Messages); err != nil {
		return nil, status.Errorf(codes.InvalidArgument, "Could not register block builder: %v", err)
	}

	return &emptypb.Empty{}, nil
}