// DelKeyWithPrefix deletes keys with prefix.
func DelKeyWithPrefix(rm kv.RetrieverMutator, prefix kv.Key) error {
var keys []kv.Key
iter, err := rm.Seek(prefix)
if err != nil {
return errors.Trace(err)
}
defer iter.Close()
for {
if err != nil {
return errors.Trace(err)
}
if iter.Valid() && iter.Key().HasPrefix(prefix) {
keys = append(keys, iter.Key().Clone())
err = iter.Next()
if err != nil {
return errors.Trace(err)
}
} else {
break
}
}
for _, key := range keys {
err := rm.Delete(key)
if err != nil {
return errors.Trace(err)
}
}
return nil
}
// Drop removes the KV index from store.
func (c *index) Drop(rm kv.RetrieverMutator) error {
it, err := rm.Seek(c.prefix)
if err != nil {
return errors.Trace(err)
}
defer it.Close()
// remove all indices
for it.Valid() {
if !it.Key().HasPrefix(c.prefix) {
break
}
err := rm.Delete(it.Key())
if err != nil {
return errors.Trace(err)
}
err = it.Next()
if err != nil {
return errors.Trace(err)
}
}
return nil
}