net/disk_cache/disk_cache_test_base.h

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_DISK_CACHE_DISK_CACHE_TEST_BASE_H_
#define NET_DISK_CACHE_DISK_CACHE_TEST_BASE_H_

#include <stdint.h>

#include <memory>

#include "base/files/file_path.h"
#include "base/files/scoped_temp_dir.h"
#include "base/macros.h"
#include "base/threading/thread.h"
#include "net/base/cache_type.h"
#include "net/disk_cache/disk_cache.h"
#include "net/test/test_with_scoped_task_environment.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"

namespace net {

class IOBuffer;

}  // namespace net

namespace disk_cache {

class Backend;
class BackendImpl;
class Entry;
class MemBackendImpl;
class SimpleBackendImpl;
class SimpleFileTracker;

}  // namespace disk_cache

// These tests can use the path service, which uses autoreleased objects on the
// Mac, so this needs to be a PlatformTest.  Even tests that do not require a
// cache (and that do not need to be a DiskCacheTestWithCache) are susceptible
// to this problem; all such tests should use TEST_F(DiskCacheTest, ...).
class DiskCacheTest : public PlatformTest, public net::WithTaskEnvironment {
 protected:
  DiskCacheTest();
  ~DiskCacheTest() override;

  // Copies a set of cache files from the data folder to the test folder.
  bool CopyTestCache(const std::string& name);

  // Deletes the contents of |cache_path_|.
  bool CleanupCacheDir();

  void TearDown() override;

  base::FilePath cache_path_;

 private:
  base::ScopedTempDir temp_dir_;
};

// Provides basic support for cache related tests.
class DiskCacheTestWithCache : public DiskCacheTest {
 protected:
  class TestIterator {
   public:
    explicit TestIterator(
        std::unique_ptr<disk_cache::Backend::Iterator> iterator);
    ~TestIterator();

    int OpenNextEntry(disk_cache::Entry** next_entry);

   private:
    std::unique_ptr<disk_cache::Backend::Iterator> iterator_;
  };

  DiskCacheTestWithCache();
  ~DiskCacheTestWithCache() override;

  void CreateBackend(uint32_t flags);

  void InitCache();
  void SimulateCrash();
  void SetTestMode();

  void SetMemoryOnlyMode() {
    memory_only_ = true;
  }

  void SetSimpleCacheMode() {
    DCHECK(!use_current_thread_);
    simple_cache_mode_ = true;
  }

  void SetMask(uint32_t mask) { mask_ = mask; }

  void SetMaxSize(int64_t size, bool should_succeed = true);

  // Returns value last given to SetMaxSize (or 0).
  int MaxSize() const { return size_; }

  // Deletes and re-creates the files on initialization errors.
  void SetForceCreation() {
    force_creation_ = true;
  }

  void SetNewEviction() {
    new_eviction_ = true;
  }

  void DisableSimpleCacheWaitForIndex() {
    simple_cache_wait_for_index_ = false;
  }

  void DisableFirstCleanup() {
    first_cleanup_ = false;
  }

  void DisableIntegrityCheck() {
    integrity_ = false;
  }

  // This is only supported for blockfile cache.
  void UseCurrentThread() {
    DCHECK(!simple_cache_mode_);
    use_current_thread_ = true;
  }

  void SetCacheType(net::CacheType type) {
    type_ = type;
  }

  // Utility methods to access the cache and wait for each operation to finish.
  int OpenOrCreateEntry(const std::string& key,
                        disk_cache::EntryWithOpened* entry_struct);
  int OpenOrCreateEntryWithPriority(const std::string& key,
                                    net::RequestPriority request_priority,
                                    disk_cache::EntryWithOpened* entry_struct);
  int OpenEntry(const std::string& key, disk_cache::Entry** entry);
  int OpenEntryWithPriority(const std::string& key,
                            net::RequestPriority request_priority,
                            disk_cache::Entry** entry);
  int CreateEntry(const std::string& key, disk_cache::Entry** entry);
  int CreateEntryWithPriority(const std::string& key,
                              net::RequestPriority request_priority,
                              disk_cache::Entry** entry);
  int DoomEntry(const std::string& key);
  int DoomAllEntries();
  int DoomEntriesBetween(const base::Time initial_time,
                         const base::Time end_time);
  int64_t CalculateSizeOfAllEntries();
  int64_t CalculateSizeOfEntriesBetween(const base::Time initial_time,
                                        const base::Time end_time);
  int DoomEntriesSince(const base::Time initial_time);
  std::unique_ptr<TestIterator> CreateIterator();
  void FlushQueueForTest();
  void RunTaskForTest(const base::Closure& closure);
  int ReadData(disk_cache::Entry* entry, int index, int offset,
               net::IOBuffer* buf, int len);
  int WriteData(disk_cache::Entry* entry, int index, int offset,
                net::IOBuffer* buf, int len, bool truncate);
  int ReadSparseData(disk_cache::Entry* entry,
                     int64_t offset,
                     net::IOBuffer* buf,
                     int len);
  int WriteSparseData(disk_cache::Entry* entry,
                      int64_t offset,
                      net::IOBuffer* buf,
                      int len);
  int GetAvailableRange(disk_cache::Entry* entry,
                        int64_t offset,
                        int len,
                        int64_t* start);

  // Asks the cache to trim an entry. If |empty| is true, the whole cache is
  // deleted.
  void TrimForTest(bool empty);

  // Asks the cache to trim an entry from the deleted list. If |empty| is
  // true, the whole list is deleted.
  void TrimDeletedListForTest(bool empty);

  // Makes sure that some time passes before continuing the test. Time::Now()
  // before and after this method will not be the same.
  void AddDelay();

  void OnExternalCacheHit(const std::string& key);

  void TearDown() override;

  // cache_ will always have a valid object, regardless of how the cache was
  // initialized. The implementation pointers can be NULL.
  std::unique_ptr<disk_cache::Backend> cache_;
  disk_cache::BackendImpl* cache_impl_;
  std::unique_ptr<disk_cache::SimpleFileTracker> simple_file_tracker_;
  disk_cache::SimpleBackendImpl* simple_cache_impl_;
  disk_cache::MemBackendImpl* mem_cache_;

  uint32_t mask_;
  int64_t size_;
  net::CacheType type_;
  bool memory_only_;
  bool simple_cache_mode_;
  bool simple_cache_wait_for_index_;
  bool force_creation_;
  bool new_eviction_;
  bool first_cleanup_;
  bool integrity_;
  bool use_current_thread_;
  // This is intentionally left uninitialized, to be used by any test.
  bool success_;

 private:
  void InitMemoryCache();
  void InitDiskCache();

  DISALLOW_COPY_AND_ASSIGN(DiskCacheTestWithCache);
};

#endif  // NET_DISK_CACHE_DISK_CACHE_TEST_BASE_H_