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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/ava-labs/coreth/core/rawdb"
"github.com/ethereum/go-ethereum/common"
"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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