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