prysm-pulse/slasher/beaconclient/validator_retrieval.go

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package beaconclient
import (
"context"
"github.com/pkg/errors"
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
"go.opencensus.io/trace"
)
// FindOrGetPublicKeys gets public keys from cache or request validators public
// keys from a beacon node via gRPC.
func (bs *Service) FindOrGetPublicKeys(
ctx context.Context,
validatorIndices []uint64,
) (map[uint64][]byte, error) {
ctx, span := trace.StartSpan(ctx, "beaconclient.FindOrGetPublicKeys")
defer span.End()
validators := make(map[uint64][]byte, len(validatorIndices))
notFound := 0
for _, validatorIdx := range validatorIndices {
pub, exists := bs.publicKeyCache.Get(validatorIdx)
if exists {
validators[validatorIdx] = pub
continue
}
// inline removal of cached elements from slice
validatorIndices[notFound] = validatorIdx
notFound++
}
// trim the slice to its new size
validatorIndices = validatorIndices[:notFound]
if len(validators) > 0 {
log.Tracef(
"Retrieved validators public keys from cache: %v",
validators,
)
}
if notFound == 0 {
return validators, nil
}
vc, err := bs.beaconClient.ListValidators(ctx, &ethpb.ListValidatorsRequest{
Indices: validatorIndices,
})
if err != nil {
return nil, errors.Wrapf(err, "could not request validators public key: %d", validatorIndices)
}
for _, v := range vc.ValidatorList {
validators[v.Index] = v.Validator.PublicKey
bs.publicKeyCache.Set(v.Index, v.Validator.PublicKey)
}
log.Tracef(
"Retrieved validators id public key map: %v",
validators,
)
return validators, nil
}