levelDB-LAB1-pzy_ckx/test/ttl_test.cc

#include "gtest/gtest.h"

#include "leveldb/env.h"
#include "leveldb/db.h"


using namespace leveldb;
// 定义了数据的大小，用于插入大数据集，燕
constexpr int value_size = 2048;
constexpr int data_size = 128 << 20;

Status OpenDB(std::string dbName, DB **db) {
  Options options;
  options.create_if_missing = true;
  return DB::Open(options, dbName, db);
}

void InsertData(DB *db, uint64_t ttl/* second */) {
  WriteOptions writeOptions;
  int key_num = data_size / value_size;
  srand(0);

  for (int i = 0; i < key_num; i++) {
    int key_ = rand() % key_num+1;
    // int key_ = i % key_num+1;
    std::string key = std::to_string(key_);
    std::string value(value_size, 'a');
    db->Put(writeOptions, key, value, ttl);
  }
}

void GetData(DB *db, int size = (1 << 30)) {
  ReadOptions readOptions;
  int key_num = data_size / value_size;
  
  // 使用随机种子生成随机键进行点查（单次查询），燕
  // 点查
  srand(0);
  for (int i = 0; i < 100; i++) {
    int key_ = rand() % key_num+1;
    //int key_ = i % key_num+1;
    std::string key = std::to_string(key_);
    std::string value;   
    db->Get(readOptions, key, &value);
  }
}

TEST(TestTTL, ReadTTL) {
    DB *db;
    if(OpenDB("testdb", &db).ok() == false) {
        std::cerr << "open db failed" << std::endl;
        abort();
    }

    uint64_t ttl = 50;

    InsertData(db, ttl);

    ReadOptions readOptions;
    Status status;
    int key_num = data_size / value_size;
    srand(0);
    for (int i = 0; i < 100; i++) {
        int key_ = rand() % key_num+1;
        // int key_ = i % key_num+1;
        std::string key = std::to_string(key_);
        std::string value;
        status = db->Get(readOptions, key, &value);
        ASSERT_TRUE(status.ok());
    }
    // 等待TTL过期，使插入的数据变为“过期”状态，燕
    Env::Default()->SleepForMicroseconds(ttl * 1000000);

    for (int i = 0; i < 100; i++) {
        int key_ = rand() % key_num+1;
        // int key_ = i % key_num+1;
        std::string key = std::to_string(key_);
        std::string value;
        status = db->Get(readOptions, key, &value);
        ASSERT_FALSE(status.ok());
    }
    delete db;
}

TEST(TestTTL, CompactionTTL) {
    DB *db;

    if(OpenDB("testdb", &db).ok() == false) {
        std::cerr << "open db failed" << std::endl;
        abort();
    }

    uint64_t ttl = 50;
    InsertData(db, ttl);

    leveldb::Range ranges[1];
    ranges[0] = leveldb::Range("-", "A");
    uint64_t sizes[1];
    db->GetApproximateSizes(ranges, 1, sizes);
    ASSERT_GT(sizes[0], 0);

    Env::Default()->SleepForMicroseconds(ttl * 1000000);

    db->CompactRange(nullptr, nullptr);

    // leveldb::Range ranges[1]; // 这里为什么要重复定义？心
    ranges[0] = leveldb::Range("-", "A");
    // uint64_t sizes[1]; // 心

    db->GetApproximateSizes(ranges, 1, sizes);
    ASSERT_EQ(sizes[0], 0);
}


int main(int argc, char** argv) {
  // All tests currently run with the same read-only file limits.
  testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}