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// Copyright (c) 2019 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.
#include <cstdint>
#include <cstdlib>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include "gtest/gtest.h"
#include "leveldb/db.h"
#include "leveldb/write_batch.h"
#include "util/testutil.h"
namespace leveldb {
namespace {
// Creates a random number in the range of [0, max).
int GenerateRandomNumber(int max) { return std::rand() % max; }
std::string CreateRandomString(int32_t index) {
static const size_t len = 1024;
char bytes[len];
size_t i = 0;
while (i < 8) {
bytes[i] = 'a' + ((index >> (4 * i)) & 0xf);
++i;
}
while (i < sizeof(bytes)) {
bytes[i] = 'a' + GenerateRandomNumber(26);
++i;
}
return std::string(bytes, sizeof(bytes));
}
} // namespace
TEST(Issue320, Test) {
std::srand(0);
bool delete_before_put = false;
bool keep_snapshots = true;
std::vector<std::unique_ptr<std::pair<std::string, std::string>>> test_map(
10000);
std::vector<Snapshot const*> snapshots(100, nullptr);
DB* db;
Options options;
options.create_if_missing = true;
std::string dbpath = testing::TempDir() + "leveldb_issue320_test";
ASSERT_LEVELDB_OK(DB::Open(options, dbpath, &db));
uint32_t target_size = 10000;
uint32_t num_items = 0;
uint32_t count = 0;
std::string key;
std::string value, old_value;
WriteOptions writeOptions;
ReadOptions readOptions;
while (count < 200000) {
if ((++count % 1000) == 0) {
std::cout << "count: " << count << std::endl;
}
int index = GenerateRandomNumber(test_map.size());
WriteBatch batch;
if (test_map[index] == nullptr) {
num_items++;
test_map[index].reset(new std::pair<std::string, std::string>(
CreateRandomString(index), CreateRandomString(index)));
batch.Put(test_map[index]->first, test_map[index]->second);
} else {
ASSERT_LEVELDB_OK(
db->Get(readOptions, test_map[index]->first, &old_value));
if (old_value != test_map[index]->second) {
std::cout << "ERROR incorrect value returned by Get" << std::endl;
std::cout << " count=" << count << std::endl;
std::cout << " old value=" << old_value << std::endl;
std::cout << " test_map[index]->second=" << test_map[index]->second
<< std::endl;
std::cout << " test_map[index]->first=" << test_map[index]->first
<< std::endl;
std::cout << " index=" << index << std::endl;
ASSERT_EQ(old_value, test_map[index]->second);
}
if (num_items >= target_size && GenerateRandomNumber(100) > 30) {
batch.Delete(test_map[index]->first);
test_map[index] = nullptr;
--num_items;
} else {
test_map[index]->second = CreateRandomString(index);
if (delete_before_put) batch.Delete(test_map[index]->first);
batch.Put(test_map[index]->first, test_map[index]->second);
}
}
ASSERT_LEVELDB_OK(db->Write(writeOptions, &batch));
if (keep_snapshots && GenerateRandomNumber(10) == 0) {
int i = GenerateRandomNumber(snapshots.size());
if (snapshots[i] != nullptr) {
db->ReleaseSnapshot(snapshots[i]);
}
snapshots[i] = db->GetSnapshot();
}
}
for (Snapshot const* snapshot : snapshots) {
if (snapshot) {
db->ReleaseSnapshot(snapshot);
}
}
delete db;
DestroyDB(dbpath, options);
}
} // namespace leveldb
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