Use read only validators in Beacon API (#13873)

beacon-chain/state/interfaces.go

@@ -118,6 +118,7 @@ type ReadOnlyValidator interface {
 // ReadOnlyValidators defines a struct which only has read access to validators methods.
 type ReadOnlyValidators interface {
 	Validators() []*ethpb.Validator
+	ValidatorsReadOnly() []ReadOnlyValidator
 	ValidatorAtIndex(idx primitives.ValidatorIndex) (*ethpb.Validator, error)
 	ValidatorAtIndexReadOnly(idx primitives.ValidatorIndex) (ReadOnlyValidator, error)
 	ValidatorIndexByPubkey(key [fieldparams.BLSPubkeyLength]byte) (primitives.ValidatorIndex, bool)

beacon-chain/state/state-native/getters_validator.go

@@ -21,6 +21,14 @@ func (b *BeaconState) Validators() []*ethpb.Validator {
 	return b.validatorsVal()
 }
 
+// ValidatorsReadOnly participating in consensus on the beacon chain.
+func (b *BeaconState) ValidatorsReadOnly() []state.ReadOnlyValidator {
+	b.lock.RLock()
+	defer b.lock.RUnlock()
+
+	return b.validatorsReadOnlyVal()
+}
+
 func (b *BeaconState) validatorsVal() []*ethpb.Validator {
 	var v []*ethpb.Validator
 	if features.Get().EnableExperimentalState {
@@ -46,6 +54,35 @@ func (b *BeaconState) validatorsVal() []*ethpb.Validator {
 	return res
 }
 
+func (b *BeaconState) validatorsReadOnlyVal() []state.ReadOnlyValidator {
+	var v []*ethpb.Validator
+	if features.Get().EnableExperimentalState {
+		if b.validatorsMultiValue == nil {
+			return nil
+		}
+		v = b.validatorsMultiValue.Value(b)
+	} else {
+		if b.validators == nil {
+			return nil
+		}
+		v = b.validators
+	}
+
+	res := make([]state.ReadOnlyValidator, len(v))
+	var err error
+	for i := 0; i < len(res); i++ {
+		val := v[i]
+		if val == nil {
+			continue
+		}
+		res[i], err = NewValidator(val)
+		if err != nil {
+			continue
+		}
+	}
+	return res
+}
+
 // references of validators participating in consensus on the beacon chain.
 // This assumes that a lock is already held on BeaconState. This does not
 // copy fully and instead just copies the reference.