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assignments.go
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assignments.go
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package beacon
import (
"context"
"strconv"
"github.com/pkg/errors"
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
"github.com/prysmaticlabs/prysm/beacon-chain/flags"
pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
"github.com/prysmaticlabs/prysm/shared/bytesutil"
"github.com/prysmaticlabs/prysm/shared/hashutil"
"github.com/prysmaticlabs/prysm/shared/pagination"
"github.com/prysmaticlabs/prysm/shared/params"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// ListValidatorAssignments retrieves the validator assignments for a given epoch,
// optional validator indices or public keys may be included to filter validator assignments.
func (bs *Server) ListValidatorAssignments(
ctx context.Context, req *ethpb.ListValidatorAssignmentsRequest,
) (*ethpb.ValidatorAssignments, error) {
if int(req.PageSize) > flags.Get().MaxPageSize {
return nil, status.Errorf(
codes.InvalidArgument,
"Requested page size %d can not be greater than max size %d",
req.PageSize,
flags.Get().MaxPageSize,
)
}
var res []*ethpb.ValidatorAssignments_CommitteeAssignment
headState, err := bs.HeadFetcher.HeadState(ctx)
if err != nil {
return nil, status.Error(codes.Internal, "Could not get head state")
}
filtered := map[uint64]bool{} // track filtered validators to prevent duplication in the response.
filteredIndices := make([]uint64, 0)
requestedEpoch := helpers.CurrentEpoch(headState)
switch q := req.QueryFilter.(type) {
case *ethpb.ListValidatorAssignmentsRequest_Genesis:
if q.Genesis {
requestedEpoch = 0
}
case *ethpb.ListValidatorAssignmentsRequest_Epoch:
requestedEpoch = q.Epoch
}
if requestedEpoch > helpers.CurrentEpoch(headState) {
return nil, status.Errorf(
codes.InvalidArgument,
"Cannot retrieve information about an epoch in the future, current epoch %d, requesting %d",
helpers.CurrentEpoch(headState),
requestedEpoch,
)
}
// Filter out assignments by public keys.
for _, pubKey := range req.PublicKeys {
index, ok, err := bs.BeaconDB.ValidatorIndex(ctx, pubKey)
if err != nil {
return nil, status.Errorf(codes.Internal, "Could not retrieve validator index: %v", err)
}
if !ok {
return nil, status.Errorf(codes.NotFound, "Could not find validator index for public key %#x", pubKey)
}
filtered[index] = true
filteredIndices = append(filteredIndices, index)
}
// Filter out assignments by validator indices.
for _, index := range req.Indices {
if !filtered[index] {
filteredIndices = append(filteredIndices, index)
}
}
activeIndices, err := helpers.ActiveValidatorIndices(headState, requestedEpoch)
if err != nil {
return nil, status.Errorf(codes.Internal, "Could not retrieve active validator indices: %v", err)
}
if len(filteredIndices) == 0 {
if len(activeIndices) == 0 {
return ðpb.ValidatorAssignments{
Assignments: make([]*ethpb.ValidatorAssignments_CommitteeAssignment, 0),
TotalSize: int32(0),
NextPageToken: strconv.Itoa(0),
}, nil
}
// If no filter was specified, return assignments from active validator indices with pagination.
filteredIndices = activeIndices
}
start, end, nextPageToken, err := pagination.StartAndEndPage(req.PageToken, int(req.PageSize), len(filteredIndices))
if err != nil {
return nil, status.Errorf(codes.Internal, "Could not paginate results: %v", err)
}
shouldFetchFromArchive := requestedEpoch < bs.FinalizationFetcher.FinalizedCheckpt().Epoch
// initialize all committee related data.
committeeAssignments := map[uint64]*helpers.CommitteeAssignmentContainer{}
proposerIndexToSlot := map[uint64]uint64{}
archivedInfo := &pb.ArchivedCommitteeInfo{}
archivedBalances := []uint64{}
archivedAssignments := make(map[uint64]*ethpb.ValidatorAssignments_CommitteeAssignment)
if shouldFetchFromArchive {
archivedInfo, archivedBalances, err = bs.archivedCommitteeData(ctx, requestedEpoch)
if err != nil {
return nil, err
}
archivedAssignments, err = archivedValidatorCommittee(
requestedEpoch,
archivedInfo,
activeIndices,
archivedBalances,
)
if err != nil {
return nil, status.Errorf(codes.Internal, "Could not retrieve archived assignment for epoch %d: %v", requestedEpoch, err)
}
} else {
committeeAssignments, proposerIndexToSlot, err = helpers.CommitteeAssignments(headState, requestedEpoch)
if err != nil {
return nil, status.Errorf(codes.Internal, "Could not compute committee assignments: %v", err)
}
}
for _, index := range filteredIndices[start:end] {
if int(index) >= headState.NumValidators() {
return nil, status.Errorf(codes.OutOfRange, "Validator index %d >= validator count %d",
index, headState.NumValidators())
}
if shouldFetchFromArchive {
assignment, ok := archivedAssignments[index]
if !ok {
return nil, status.Errorf(codes.Internal, "Could not get archived committee assignment for index %d", index)
}
pubkey := headState.PubkeyAtIndex(index)
assignment.PublicKey = pubkey[:]
res = append(res, assignment)
continue
}
comAssignment := committeeAssignments[index]
pubkey := headState.PubkeyAtIndex(index)
assign := ðpb.ValidatorAssignments_CommitteeAssignment{
BeaconCommittees: comAssignment.Committee,
CommitteeIndex: comAssignment.CommitteeIndex,
AttesterSlot: comAssignment.AttesterSlot,
ProposerSlot: proposerIndexToSlot[index],
PublicKey: pubkey[:],
}
res = append(res, assign)
}
return ðpb.ValidatorAssignments{
Epoch: requestedEpoch,
Assignments: res,
NextPageToken: nextPageToken,
TotalSize: int32(len(filteredIndices)),
}, nil
}
// Computes validator assignments for an epoch and validator index using archived committee
// information, archived balances, and a set of active validators.
func archivedValidatorCommittee(
epoch uint64,
archivedInfo *pb.ArchivedCommitteeInfo,
activeIndices []uint64,
archivedBalances []uint64,
) (map[uint64]*ethpb.ValidatorAssignments_CommitteeAssignment, error) {
proposerSeed := bytesutil.ToBytes32(archivedInfo.ProposerSeed)
attesterSeed := bytesutil.ToBytes32(archivedInfo.AttesterSeed)
startSlot := helpers.StartSlot(epoch)
proposerIndexToSlot := make(map[uint64]uint64)
activeVals := make([]*ethpb.Validator, len(archivedBalances))
for i, bal := range archivedBalances {
activeVals[i] = ðpb.Validator{EffectiveBalance: bal}
}
for slot := startSlot; slot < startSlot+params.BeaconConfig().SlotsPerEpoch; slot++ {
seedWithSlot := append(proposerSeed[:], bytesutil.Bytes8(slot)...)
seedWithSlotHash := hashutil.Hash(seedWithSlot)
i, err := helpers.ComputeProposerIndex(activeVals, activeIndices, seedWithSlotHash)
if err != nil {
return nil, errors.Wrapf(err, "could not check proposer at slot %d", slot)
}
proposerIndexToSlot[i] = slot
}
assignmentMap := make(map[uint64]*ethpb.ValidatorAssignments_CommitteeAssignment)
for slot := startSlot; slot < startSlot+params.BeaconConfig().SlotsPerEpoch; slot++ {
var countAtSlot = uint64(len(activeIndices)) / params.BeaconConfig().SlotsPerEpoch / params.BeaconConfig().TargetCommitteeSize
if countAtSlot > params.BeaconConfig().MaxCommitteesPerSlot {
countAtSlot = params.BeaconConfig().MaxCommitteesPerSlot
}
if countAtSlot == 0 {
countAtSlot = 1
}
for i := uint64(0); i < countAtSlot; i++ {
committee, err := helpers.BeaconCommittee(activeIndices, attesterSeed, slot, i)
if err != nil {
return nil, errors.Wrap(err, "could not compute committee")
}
for _, index := range committee {
assignmentMap[index] = ðpb.ValidatorAssignments_CommitteeAssignment{
BeaconCommittees: committee,
CommitteeIndex: i,
AttesterSlot: slot,
ProposerSlot: proposerIndexToSlot[index],
}
}
}
}
return assignmentMap, nil
}
func (bs *Server) archivedCommitteeData(ctx context.Context, requestedEpoch uint64) (*pb.ArchivedCommitteeInfo,
[]uint64, error) {
archivedInfo, err := bs.BeaconDB.ArchivedCommitteeInfo(ctx, requestedEpoch)
if err != nil {
return nil, nil, status.Errorf(
codes.Internal,
"Could not retrieve archived committee info for epoch %d",
requestedEpoch,
)
}
if archivedInfo == nil {
return nil, nil, status.Errorf(
codes.NotFound,
"Could not retrieve data for epoch %d, perhaps --archive in the running beacon node is disabled",
requestedEpoch,
)
}
archivedBalances, err := bs.BeaconDB.ArchivedBalances(ctx, requestedEpoch)
if err != nil {
return nil, nil, status.Errorf(
codes.Internal,
"Could not retrieve archived balances for epoch %d",
requestedEpoch,
)
}
if archivedBalances == nil {
return nil, nil, status.Errorf(
codes.NotFound,
"Could not retrieve data for epoch %d, perhaps --archive in the running beacon node is disabled",
requestedEpoch,
)
}
return archivedInfo, archivedBalances, nil
}