mirror of
https://github.com/ethereum/go-ethereum.git
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52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
// Copyright 2024 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package ethdb defines the interfaces for an Ethereum data store.
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package ethdb
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import (
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"bytes"
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"errors"
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)
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var ErrTooManyKeys = errors.New("too many keys in deleted range")
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// DeleteRangeWithIterator is a fallback method for deleting a key range from a
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// database that does not natively support range deletion.
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// Note that the number of deleted keys is limited in order to avoid blocking for
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// a very long time. ErrTooManyKeys is returned if the range has only been
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// partially deleted. In this case the caller can repeat the call until it
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// finally succeeds.
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func DeleteRangeWithIterator(db KeyValueStore, start, end []byte) error {
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batch := db.NewBatch()
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it := db.NewIterator(nil, start)
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defer it.Release()
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var count int
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for it.Next() && bytes.Compare(end, it.Key()) > 0 {
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count++
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if count > 10000 { // should not block for more than a second
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if err := batch.Write(); err != nil {
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return err
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}
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return ErrTooManyKeys
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}
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if err := batch.Delete(it.Key()); err != nil {
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return err
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}
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}
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return batch.Write()
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}
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