prysm-pulse/beacon-chain/state/v3/setters_state.go

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package v3
import (
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/beacon-chain/state/stateutil"
)
// SetStateRoots for the beacon state. Updates the state roots
// to a new value by overwriting the previous value.
func (b *BeaconState) SetStateRoots(val [][]byte) error {
if !b.hasInnerState() {
return ErrNilInnerState
}
b.lock.Lock()
defer b.lock.Unlock()
b.sharedFieldReferences[stateRoots].MinusRef()
b.sharedFieldReferences[stateRoots] = stateutil.NewRef(1)
b.state.StateRoots = val
b.markFieldAsDirty(stateRoots)
b.rebuildTrie[stateRoots] = true
return nil
}
// UpdateStateRootAtIndex for the beacon state. Updates the state root
// at a specific index to a new value.
func (b *BeaconState) UpdateStateRootAtIndex(idx uint64, stateRoot [32]byte) error {
if !b.hasInnerState() {
return ErrNilInnerState
}
b.lock.RLock()
if uint64(len(b.state.StateRoots)) <= idx {
b.lock.RUnlock()
return errors.Errorf("invalid index provided %d", idx)
}
b.lock.RUnlock()
b.lock.Lock()
defer b.lock.Unlock()
// Check if we hold the only reference to the shared state roots slice.
r := b.state.StateRoots
if ref := b.sharedFieldReferences[stateRoots]; ref.Refs() > 1 {
// Copy elements in underlying array by reference.
r = make([][]byte, len(b.state.StateRoots))
copy(r, b.state.StateRoots)
ref.MinusRef()
b.sharedFieldReferences[stateRoots] = stateutil.NewRef(1)
}
r[idx] = stateRoot[:]
b.state.StateRoots = r
b.markFieldAsDirty(stateRoots)
b.addDirtyIndices(stateRoots, []uint64{idx})
return nil
}