// helpers to marshal / unmarshal a pin set
func storeSet(d ds.Datastore, k ds.Key, val interface{}) error {
buf, err := json.Marshal(val)
if err != nil {
return err
}
return d.Put(k, buf)
}
func loadSet(d ds.Datastore, k ds.Key, val interface{}) error {
buf, err := d.Get(k)
if err != nil {
return err
}
bf, ok := buf.([]byte)
if !ok {
return errors.New("invalid pin set value in datastore")
}
return json.Unmarshal(bf, val)
}