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91 lines
2.8 KiB
91 lines
2.8 KiB
// Copyright 2019 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 snapshot
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import (
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"bytes"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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)
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// wipeKeyRange deletes a range of keys from the database starting with prefix
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// and having a specific total key length. The start and limit is optional for
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// specifying a particular key range for deletion.
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//
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// Origin is included for wiping and limit is excluded if they are specified.
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func wipeKeyRange(db ethdb.KeyValueStore, kind string, prefix []byte, origin []byte, limit []byte, keylen int, meter metrics.Meter, report bool) error {
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// Batch deletions together to avoid holding an iterator for too long
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var (
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batch = db.NewBatch()
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items int
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)
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// Iterate over the key-range and delete all of them
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start, logged := time.Now(), time.Now()
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it := db.NewIterator(prefix, origin)
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var stop []byte
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if limit != nil {
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stop = append(prefix, limit...)
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}
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for it.Next() {
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// Skip any keys with the correct prefix but wrong length (trie nodes)
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key := it.Key()
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if !bytes.HasPrefix(key, prefix) {
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break
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}
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if len(key) != keylen {
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continue
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}
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if stop != nil && bytes.Compare(key, stop) >= 0 {
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break
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}
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// Delete the key and periodically recreate the batch and iterator
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batch.Delete(key)
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items++
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if items%10000 == 0 {
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// Batch too large (or iterator too long lived, flush and recreate)
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it.Release()
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if err := batch.Write(); err != nil {
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return err
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}
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batch.Reset()
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seekPos := key[len(prefix):]
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it = db.NewIterator(prefix, seekPos)
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if time.Since(logged) > 8*time.Second && report {
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log.Info("Deleting state snapshot leftovers", "kind", kind, "wiped", items, "elapsed", common.PrettyDuration(time.Since(start)))
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logged = time.Now()
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}
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}
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}
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it.Release()
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if err := batch.Write(); err != nil {
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return err
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}
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if meter != nil {
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meter.Mark(int64(items))
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}
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if report {
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log.Info("Deleted state snapshot leftovers", "kind", kind, "wiped", items, "elapsed", common.PrettyDuration(time.Since(start)))
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}
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return nil
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}
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