leveldb.project/test/ttl_test.cc

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

using namespace leveldb;

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;
    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;
  
  // 点查
  srand(0);
  for (int i = 0; i < 100; i++) {
    int key_ = rand() % 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();
  }
  // 如果出现open db fail,请酌情提高这里
  uint64_t ttl = 20;

  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;
    std::string key = std::to_string(key_);
    std::string value;
    status = db->Get(readOptions, key, &value);
    ASSERT_TRUE(status.ok());
  }

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

  for (int i = 0; i < 100; i++) {
    int key_ = rand() % 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;
  Env::Default()->SleepForMicroseconds( 1000);
}

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

  uint64_t ttl = 20;
  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 ranges2[1];
  ranges2[0] = leveldb::Range("-", "A");
  uint64_t sizes2[1];
  db->GetApproximateSizes(ranges2, 1, sizes2);
  ASSERT_EQ(sizes2[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();
}