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Update docs (#2173)

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* Update docs

* Update docs
This commit is contained in:
Jerry Fireman 2019-04-11 15:50:16 -04:00 committed by Raul Jordan
parent b6bd8ba63d
commit c0cc5c0295
1 changed files with 5 additions and 3 deletions
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8
beacon-chain/db/state.go
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@ -261,7 +261,8 @@ func (db *BeaconDB) FinalizedState() (*pb.BeaconState, error) {
return beaconState, err return beaconState, err
} }
// HistoricalStateFromSlot retrieves the closest historical state to a slot. // HistoricalStateFromSlot retrieves the state that is closest to the input slot,
// while being smaller than or equal to the input slot.
func (db *BeaconDB) HistoricalStateFromSlot(ctx context.Context, slot uint64) (*pb.BeaconState, error) { func (db *BeaconDB) HistoricalStateFromSlot(ctx context.Context, slot uint64) (*pb.BeaconState, error) {
_, span := trace.StartSpan(ctx, "BeaconDB.HistoricalStateFromSlot") _, span := trace.StartSpan(ctx, "BeaconDB.HistoricalStateFromSlot")
defer span.End() defer span.End()
@ -286,7 +287,8 @@ func (db *BeaconDB) HistoricalStateFromSlot(ctx context.Context, slot uint64) (*
break break
} }
} }
// If no state exists send the closest state.
// If no historical state exists, retrieve and decode the finalized state.
if !stateExists { if !stateExists {
for k, v := hsCursor.First(); k != nil; k, v = hsCursor.Next() { for k, v := hsCursor.First(); k != nil; k, v = hsCursor.Next() {
slotNumber := decodeToSlotNumber(k) slotNumber := decodeToSlotNumber(k)
@ -303,7 +305,7 @@ func (db *BeaconDB) HistoricalStateFromSlot(ctx context.Context, slot uint64) (*
} }
} }
// retrieve the stored historical state. // If historical state exists, retrieve and decode it.
encState := chainInfo.Get(histStateKey) encState := chainInfo.Get(histStateKey)
if encState == nil { if encState == nil {
return errors.New("no historical state saved") return errors.New("no historical state saved")