1 files changed, 124 insertions, 0 deletions
diff --git a/core/state/snapshot/wipe_test.go b/core/state/snapshot/wipe_test.go
new file mode 100644
index 0000000..a656982
--- /dev/null
+++ b/core/state/snapshot/wipe_test.go
@@ -0,0 +1,124 @@
+// 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)
+	}
+}