132 lines
4.4 KiB
Go
132 lines
4.4 KiB
Go
// 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/core/rawdb"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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)
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// wipeSnapshot starts a goroutine to iterate over the entire key-value database
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// and delete all the data associated with the snapshot (accounts, storage,
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// metadata). After all is done, the snapshot range of the database is compacted
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// to free up unused data blocks.
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func wipeSnapshot(db ethdb.KeyValueStore, full bool) chan struct{} {
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// Wipe the snapshot root marker synchronously
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if full {
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rawdb.DeleteSnapshotRoot(db)
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}
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// Wipe everything else asynchronously
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wiper := make(chan struct{}, 1)
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go func() {
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if err := wipeContent(db); err != nil {
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log.Error("Failed to wipe state snapshot", "err", err) // Database close will trigger this
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return
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}
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close(wiper)
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}()
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return wiper
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}
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// wipeContent iterates over the entire key-value database and deletes all the
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// data associated with the snapshot (accounts, storage), but not the root hash
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// as the wiper is meant to run on a background thread but the root needs to be
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// removed in sync to avoid data races. After all is done, the snapshot range of
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// the database is compacted to free up unused data blocks.
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func wipeContent(db ethdb.KeyValueStore) error {
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if err := wipeKeyRange(db, "accounts", rawdb.SnapshotAccountPrefix, len(rawdb.SnapshotAccountPrefix)+common.HashLength); err != nil {
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return err
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}
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if err := wipeKeyRange(db, "storage", rawdb.SnapshotStoragePrefix, len(rawdb.SnapshotStoragePrefix)+2*common.HashLength); err != nil {
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return err
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}
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// Compact the snapshot section of the database to get rid of unused space
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start := time.Now()
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log.Info("Compacting snapshot account area ")
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end := common.CopyBytes(rawdb.SnapshotAccountPrefix)
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end[len(end)-1]++
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if err := db.Compact(rawdb.SnapshotAccountPrefix, end); err != nil {
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return err
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}
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log.Info("Compacting snapshot storage area ")
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end = common.CopyBytes(rawdb.SnapshotStoragePrefix)
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end[len(end)-1]++
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if err := db.Compact(rawdb.SnapshotStoragePrefix, end); err != nil {
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return err
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}
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log.Info("Compacted snapshot area in database", "elapsed", common.PrettyDuration(time.Since(start)))
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return nil
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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.
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func wipeKeyRange(db ethdb.KeyValueStore, kind string, prefix []byte, keylen int) 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, nil)
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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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// 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 {
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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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log.Info("Deleted state snapshot leftovers", "kind", kind, "wiped", items, "elapsed", common.PrettyDuration(time.Since(start)))
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return nil
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}
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