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- // Copyright 2019 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 snapshot
- import (
- "math/rand"
- "testing"
- "github.com/ethereum/go-ethereum/common"
- "github.com/ethereum/go-ethereum/core/rawdb"
- "github.com/ethereum/go-ethereum/ethdb/memorydb"
- )
- // Tests that given a database with random data content, all parts of a snapshot
- // can be crrectly wiped without touching anything else.
- func TestWipe(t *testing.T) {
- // Create a database with some random snapshot data
- db := memorydb.New()
- for i := 0; i < 128; i++ {
- account := randomHash()
- rawdb.WriteAccountSnapshot(db, account, randomHash().Bytes())
- for j := 0; j < 1024; j++ {
- rawdb.WriteStorageSnapshot(db, account, randomHash(), randomHash().Bytes())
- }
- }
- rawdb.WriteSnapshotRoot(db, randomHash())
- // Add some random non-snapshot data too to make wiping harder
- for i := 0; i < 65536; i++ {
- // Generate a key that's the wrong length for a state snapshot item
- var keysize int
- for keysize == 0 || keysize == 32 || keysize == 64 {
- keysize = 8 + rand.Intn(64) // +8 to ensure we will "never" randomize duplicates
- }
- // Randomize the suffix, dedup and inject it under the snapshot namespace
- keysuffix := make([]byte, keysize)
- rand.Read(keysuffix)
- if rand.Int31n(2) == 0 {
- db.Put(append(rawdb.SnapshotAccountPrefix, keysuffix...), randomHash().Bytes())
- } else {
- db.Put(append(rawdb.SnapshotStoragePrefix, keysuffix...), randomHash().Bytes())
- }
- }
- // Sanity check that all the keys are present
- var items int
- it := db.NewIterator(rawdb.SnapshotAccountPrefix, nil)
- defer it.Release()
- for it.Next() {
- key := it.Key()
- if len(key) == len(rawdb.SnapshotAccountPrefix)+common.HashLength {
- items++
- }
- }
- it = db.NewIterator(rawdb.SnapshotStoragePrefix, nil)
- defer it.Release()
- for it.Next() {
- key := it.Key()
- if len(key) == len(rawdb.SnapshotStoragePrefix)+2*common.HashLength {
- items++
- }
- }
- if items != 128+128*1024 {
- t.Fatalf("snapshot size mismatch: have %d, want %d", items, 128+128*1024)
- }
- if hash := rawdb.ReadSnapshotRoot(db); hash == (common.Hash{}) {
- t.Errorf("snapshot block marker mismatch: have %#x, want <not-nil>", hash)
- }
- // Wipe all snapshot entries from the database
- <-wipeSnapshot(db, true)
- // Iterate over the database end ensure no snapshot information remains
- it = db.NewIterator(rawdb.SnapshotAccountPrefix, nil)
- defer it.Release()
- for it.Next() {
- key := it.Key()
- if len(key) == len(rawdb.SnapshotAccountPrefix)+common.HashLength {
- t.Errorf("snapshot entry remained after wipe: %x", key)
- }
- }
- it = db.NewIterator(rawdb.SnapshotStoragePrefix, nil)
- defer it.Release()
- for it.Next() {
- key := it.Key()
- if len(key) == len(rawdb.SnapshotStoragePrefix)+2*common.HashLength {
- t.Errorf("snapshot entry remained after wipe: %x", key)
- }
- }
- if hash := rawdb.ReadSnapshotRoot(db); hash != (common.Hash{}) {
- t.Errorf("snapshot block marker remained after wipe: %#x", hash)
- }
- // Iterate over the database and ensure miscellaneous items are present
- items = 0
- it = db.NewIterator(nil, nil)
- defer it.Release()
- for it.Next() {
- items++
- }
- if items != 65536 {
- t.Fatalf("misc item count mismatch: have %d, want %d", items, 65536)
- }
- }
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