add leveldb

2023-03-08 11:35:54 +11:00
parent d01f1bee10
commit 4887f37898
160 changed files with 31968 additions and 1 deletions
@@ -0,0 +1,59 @@
+// Copyright (c) 2013 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+// Test for issue 200: when iterator switches direction from backward
+// to forward, the current key can be yielded unexpectedly if a new
+// mutation has been added just before the current key.
+
+#include "gtest/gtest.h"
+#include "leveldb/db.h"
+#include "util/testutil.h"
+
+namespace leveldb {
+
+TEST(Issue200, Test) {
+  // Get rid of any state from an old run.
+  std::string dbpath = testing::TempDir() + "leveldb_issue200_test";
+  DestroyDB(dbpath, Options());
+
+  DB* db;
+  Options options;
+  options.create_if_missing = true;
+  ASSERT_LEVELDB_OK(DB::Open(options, dbpath, &db));
+
+  WriteOptions write_options;
+  ASSERT_LEVELDB_OK(db->Put(write_options, "1", "b"));
+  ASSERT_LEVELDB_OK(db->Put(write_options, "2", "c"));
+  ASSERT_LEVELDB_OK(db->Put(write_options, "3", "d"));
+  ASSERT_LEVELDB_OK(db->Put(write_options, "4", "e"));
+  ASSERT_LEVELDB_OK(db->Put(write_options, "5", "f"));
+
+  ReadOptions read_options;
+  Iterator* iter = db->NewIterator(read_options);
+
+  // Add an element that should not be reflected in the iterator.
+  ASSERT_LEVELDB_OK(db->Put(write_options, "25", "cd"));
+
+  iter->Seek("5");
+  ASSERT_EQ(iter->key().ToString(), "5");
+  iter->Prev();
+  ASSERT_EQ(iter->key().ToString(), "4");
+  iter->Prev();
+  ASSERT_EQ(iter->key().ToString(), "3");
+  iter->Next();
+  ASSERT_EQ(iter->key().ToString(), "4");
+  iter->Next();
+  ASSERT_EQ(iter->key().ToString(), "5");
+
+  delete iter;
+  delete db;
+  DestroyDB(dbpath, options);
+}
+
+}  // namespace leveldb
+
+int main(int argc, char** argv) {
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}