plugeth/core/state/snapshot/wipe_test.go

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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++ {
rawdb.WriteAccountSnapshot(db, randomHash(), randomHash().Bytes())
}
// Add some random non-snapshot data too to make wiping harder
for i := 0; i < 500; i++ {
// Generate keys with wrong length for a state snapshot item
keysuffix := make([]byte, 31)
rand.Read(keysuffix)
db.Put(append(rawdb.SnapshotAccountPrefix, keysuffix...), randomHash().Bytes())
keysuffix = make([]byte, 33)
rand.Read(keysuffix)
db.Put(append(rawdb.SnapshotAccountPrefix, keysuffix...), randomHash().Bytes())
}
count := func() (items int) {
it := db.NewIterator(rawdb.SnapshotAccountPrefix, nil)
defer it.Release()
for it.Next() {
if len(it.Key()) == len(rawdb.SnapshotAccountPrefix)+common.HashLength {
items++
}
}
return items
}
// Sanity check that all the keys are present
if items := count(); items != 128 {
t.Fatalf("snapshot size mismatch: have %d, want %d", items, 128)
}
// Wipe the accounts
if err := wipeKeyRange(db, "accounts", rawdb.SnapshotAccountPrefix, nil, nil,
len(rawdb.SnapshotAccountPrefix)+common.HashLength, snapWipedAccountMeter, true); err != nil {
t.Fatal(err)
}
// Iterate over the database end ensure no snapshot information remains
if items := count(); items != 0 {
t.Fatalf("snapshot size mismatch: have %d, want %d", items, 0)
}
// 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 != 1000 {
t.Fatalf("misc item count mismatch: have %d, want %d", items, 1000)
}
}