core/rawdb: add specified key length iterator (#24535)

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aaronbuchwald 2022-03-15 04:28:26 -04:00 committed by GitHub
parent 70da74e73a
commit c3701b265e
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 119 additions and 13 deletions

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@ -115,7 +115,7 @@ func DeleteStorageSnapshot(db ethdb.KeyValueWriter, accountHash, storageHash com
// IterateStorageSnapshots returns an iterator for walking the entire storage
// space of a specific account.
func IterateStorageSnapshots(db ethdb.Iteratee, accountHash common.Hash) ethdb.Iterator {
return db.NewIterator(storageSnapshotsKey(accountHash), nil)
return NewKeyLengthIterator(db.NewIterator(storageSnapshotsKey(accountHash), nil), len(SnapshotStoragePrefix)+2*common.HashLength)
}
// ReadSnapshotJournal retrieves the serialized in-memory diff layers saved at

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@ -0,0 +1,47 @@
// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rawdb
import "github.com/ethereum/go-ethereum/ethdb"
// KeyLengthIterator is a wrapper for a database iterator that ensures only key-value pairs
// with a specific key length will be returned.
type KeyLengthIterator struct {
requiredKeyLength int
ethdb.Iterator
}
// NewKeyLengthIterator returns a wrapped version of the iterator that will only return key-value
// pairs where keys with a specific key length will be returned.
func NewKeyLengthIterator(it ethdb.Iterator, keyLen int) ethdb.Iterator {
return &KeyLengthIterator{
Iterator: it,
requiredKeyLength: keyLen,
}
}
func (it *KeyLengthIterator) Next() bool {
// Return true as soon as a key with the required key length is discovered
for it.Iterator.Next() {
if len(it.Iterator.Key()) == it.requiredKeyLength {
return true
}
}
// Return false when we exhaust the keys in the underlying iterator.
return false
}

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@ -0,0 +1,60 @@
// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rawdb
import (
"encoding/binary"
"testing"
)
func TestKeyLengthIterator(t *testing.T) {
db := NewMemoryDatabase()
keyLen := 8
expectedKeys := make(map[string]struct{})
for i := 0; i < 100; i++ {
key := make([]byte, keyLen)
binary.BigEndian.PutUint64(key, uint64(i))
if err := db.Put(key, []byte{0x1}); err != nil {
t.Fatal(err)
}
expectedKeys[string(key)] = struct{}{}
longerKey := make([]byte, keyLen*2)
binary.BigEndian.PutUint64(longerKey, uint64(i))
if err := db.Put(longerKey, []byte{0x1}); err != nil {
t.Fatal(err)
}
}
it := NewKeyLengthIterator(db.NewIterator(nil, nil), keyLen)
for it.Next() {
key := it.Key()
_, exists := expectedKeys[string(key)]
if !exists {
t.Fatalf("Found unexpected key %d", binary.BigEndian.Uint64(key))
}
delete(expectedKeys, string(key))
if len(key) != keyLen {
t.Fatalf("Found unexpected key in key length iterator with length %d", len(key))
}
}
if len(expectedKeys) != 0 {
t.Fatalf("Expected all keys of length %d to be removed from expected keys during iteration", keyLen)
}
}

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@ -546,7 +546,7 @@ func diffToDisk(bottom *diffLayer) *diskLayer {
it := rawdb.IterateStorageSnapshots(base.diskdb, hash)
for it.Next() {
if key := it.Key(); len(key) == 65 { // TODO(karalabe): Yuck, we should move this into the iterator
key := it.Key()
batch.Delete(key)
base.cache.Del(key[1:])
snapshotFlushStorageItemMeter.Mark(1)
@ -561,7 +561,6 @@ func diffToDisk(bottom *diffLayer) *diskLayer {
batch.Reset()
}
}
}
it.Release()
}
// Push all updated accounts into the database