Disk cache: Introduce BlockBitmaps for V3.

net/disk_cache/v3/block_bitmaps_unittest.cc

 // 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.
 
-#include "base/file_util.h"
-#include "base/files/file_enumerator.h"
+#include "net/disk_cache/addr.h"
 #include "net/disk_cache/block_files.h"
-#include "net/disk_cache/disk_cache.h"
-#include "net/disk_cache/disk_cache_test_base.h"
-#include "net/disk_cache/disk_cache_test_util.h"
+#include "net/disk_cache/disk_format_base.h"
+#include "net/disk_cache/v3/block_bitmaps.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::Time;
+// Tests that we add and remove blocks correctly.
+TEST(DiskCacheBlockBitmaps, V3AllocationMap) {
+  disk_cache::BlockBitmaps block_bitmaps;
+  disk_cache::BlockFilesBitmaps bitmaps;
 
-namespace {
-
-// Returns the number of files in this folder.
-int NumberOfFiles(const base::FilePath& path) {
-  base::FileEnumerator iter(path, false, base::FileEnumerator::FILES);
-  int count = 0;
-  for (base::FilePath file = iter.Next(); !file.value().empty();
-       file = iter.Next()) {
-    count++;
-  }
-  return count;
-}
-
-}  // namespace;
-
-namespace disk_cache {
-
-TEST_F(DiskCacheTest, BlockFiles_Grow) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-
-  const int kMaxSize = 35000;
-  Addr address[kMaxSize];
-
-  // Fill up the 32-byte block file (use three files).
-  for (int i = 0; i < kMaxSize; i++) {
-    EXPECT_TRUE(files.CreateBlock(RANKINGS, 4, &address[i]));
-  }
-  EXPECT_EQ(6, NumberOfFiles(cache_path_));
-
-  // Make sure we don't keep adding files.
-  for (int i = 0; i < kMaxSize * 4; i += 2) {
-    int target = i % kMaxSize;
-    files.DeleteBlock(address[target], false);
-    EXPECT_TRUE(files.CreateBlock(RANKINGS, 4, &address[target]));
-  }
-  EXPECT_EQ(6, NumberOfFiles(cache_path_));
-}
-
-// We should be able to delete empty block files.
-TEST_F(DiskCacheTest, BlockFiles_Shrink) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-
-  const int kMaxSize = 35000;
-  Addr address[kMaxSize];
-
-  // Fill up the 32-byte block file (use three files).
-  for (int i = 0; i < kMaxSize; i++) {
-    EXPECT_TRUE(files.CreateBlock(RANKINGS, 4, &address[i]));
+  const int kNumHeaders = 10;  // Just a bunch of "files".
+  disk_cache::BlockFileHeader headers[kNumHeaders];
+  for (int i = 0; i < kNumHeaders; i++) {
+    memset(&headers[i], 0, sizeof(headers[i]));
+    headers[i].magic = disk_cache::kBlockMagic;
+    headers[i].version = disk_cache::kBlockCurrentVersion;
+    headers[i].this_file = static_cast<int16>(i);
+    headers[i].empty[3] = 200;
+    headers[i].max_entries = 800;
+    bitmaps.push_back(disk_cache::BlockHeader(&headers[i]));
   }
 
-  // Now delete all the blocks, so that we can delete the two extra files.
-  for (int i = 0; i < kMaxSize; i++) {
-    files.DeleteBlock(address[i], false);
-  }
-  EXPECT_EQ(4, NumberOfFiles(cache_path_));
-}
-
-// Handling of block files not properly closed.
-TEST_F(DiskCacheTest, BlockFiles_Recover) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-
-  const int kNumEntries = 2000;
-  CacheAddr entries[kNumEntries];
-
-  int seed = static_cast<int>(Time::Now().ToInternalValue());
-  srand(seed);
-  for (int i = 0; i < kNumEntries; i++) {
-    Addr address(0);
-    int size = (rand() % 4) + 1;
-    EXPECT_TRUE(files.CreateBlock(RANKINGS, size, &address));
-    entries[i] = address.value();
-  }
-
-  for (int i = 0; i < kNumEntries; i++) {
-    int source1 = rand() % kNumEntries;
-    int source2 = rand() % kNumEntries;
-    CacheAddr temp = entries[source1];
-    entries[source1] = entries[source2];
-    entries[source2] = temp;
-  }
-
-  for (int i = 0; i < kNumEntries / 2; i++) {
-    Addr address(entries[i]);
-    files.DeleteBlock(address, false);
-  }
-
-  // At this point, there are kNumEntries / 2 entries on the file, randomly
-  // distributed both on location and size.
-
-  Addr address(entries[kNumEntries / 2]);
-  MappedFile* file = files.GetFile(address);
-  ASSERT_TRUE(NULL != file);
-
-  BlockFileHeader* header =
-      reinterpret_cast<BlockFileHeader*>(file->buffer());
-  ASSERT_TRUE(NULL != header);
-
-  ASSERT_EQ(0, header->updating);
-
-  int max_entries = header->max_entries;
-  int empty_1 = header->empty[0];
-  int empty_2 = header->empty[1];
-  int empty_3 = header->empty[2];
-  int empty_4 = header->empty[3];
-
-  // Corrupt the file.
-  header->max_entries = header->empty[0] = 0;
-  header->empty[1] = header->empty[2] = header->empty[3] = 0;
-  header->updating = -1;
-
-  files.CloseFiles();
-
-  ASSERT_TRUE(files.Init(false));
-
-  // The file must have been fixed.
-  file = files.GetFile(address);
-  ASSERT_TRUE(NULL != file);
-
-  header = reinterpret_cast<BlockFileHeader*>(file->buffer());
-  ASSERT_TRUE(NULL != header);
-
-  ASSERT_EQ(0, header->updating);
-
-  EXPECT_EQ(max_entries, header->max_entries);
-  EXPECT_EQ(empty_1, header->empty[0]);
-  EXPECT_EQ(empty_2, header->empty[1]);
-  EXPECT_EQ(empty_3, header->empty[2]);
-  EXPECT_EQ(empty_4, header->empty[3]);
-}
-
-// Handling of truncated files.
-TEST_F(DiskCacheTest, BlockFiles_ZeroSizeFile) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-
-  base::FilePath filename = files.Name(0);
-  files.CloseFiles();
-  // Truncate one of the files.
-  {
-    scoped_refptr<File> file(new File);
-    ASSERT_TRUE(file->Init(filename));
-    EXPECT_TRUE(file->SetLength(0));
-  }
-
-  // Initializing should fail, not crash.
-  ASSERT_FALSE(files.Init(false));
-}
-
-// Handling of truncated files (non empty).
-TEST_F(DiskCacheTest, BlockFiles_TruncatedFile) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-  Addr address;
-  EXPECT_TRUE(files.CreateBlock(RANKINGS, 2, &address));
-
-  base::FilePath filename = files.Name(0);
-  files.CloseFiles();
-  // Truncate one of the files.
-  {
-    scoped_refptr<File> file(new File);
-    ASSERT_TRUE(file->Init(filename));
-    EXPECT_TRUE(file->SetLength(15000));
-  }
-
-  // Initializing should fail, not crash.
-  ASSERT_FALSE(files.Init(false));
-}
-
-// Tests detection of out of sync counters.
-TEST_F(DiskCacheTest, BlockFiles_Counters) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-
-  // Create a block of size 2.
-  Addr address(0);
-  EXPECT_TRUE(files.CreateBlock(RANKINGS, 2, &address));
-
-  MappedFile* file = files.GetFile(address);
-  ASSERT_TRUE(NULL != file);
-
-  BlockFileHeader* header = reinterpret_cast<BlockFileHeader*>(file->buffer());
-  ASSERT_TRUE(NULL != header);
-  ASSERT_EQ(0, header->updating);
-
-  // Alter the counters so that the free space doesn't add up.
-  header->empty[2] = 50;  // 50 free blocks of size 3.
-  files.CloseFiles();
-
-  ASSERT_TRUE(files.Init(false));
-  file = files.GetFile(address);
-  ASSERT_TRUE(NULL != file);
-  header = reinterpret_cast<BlockFileHeader*>(file->buffer());
-  ASSERT_TRUE(NULL != header);
-
-  // The file must have been fixed.
-  ASSERT_EQ(0, header->empty[2]);
-
-  // Change the number of entries.
-  header->num_entries = 3;
-  header->updating = 1;
-  files.CloseFiles();
-
-  ASSERT_TRUE(files.Init(false));
-  file = files.GetFile(address);
-  ASSERT_TRUE(NULL != file);
-  header = reinterpret_cast<BlockFileHeader*>(file->buffer());
-  ASSERT_TRUE(NULL != header);
-
-  // The file must have been "fixed".
-  ASSERT_EQ(2, header->num_entries);
-
-  // Change the number of entries.
-  header->num_entries = -1;
-  header->updating = 1;
-  files.CloseFiles();
-
-  // Detect the error.
-  ASSERT_FALSE(files.Init(false));
-}
-
-// An invalid file can be detected after init.
-TEST_F(DiskCacheTest, BlockFiles_InvalidFile) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
-
-  // Let's access block 10 of file 5. (There is no file).
-  Addr addr(BLOCK_256, 1, 5, 10);
-  EXPECT_TRUE(NULL == files.GetFile(addr));
-
-  // Let's create an invalid file.
-  base::FilePath filename(files.Name(5));
-  char header[kBlockHeaderSize];
-  memset(header, 'a', kBlockHeaderSize);
-  EXPECT_EQ(kBlockHeaderSize,
-            file_util::WriteFile(filename, header, kBlockHeaderSize));
-
-  EXPECT_TRUE(NULL == files.GetFile(addr));
-
-  // The file should not have been changed (it is still invalid).
-  EXPECT_TRUE(NULL == files.GetFile(addr));
-}
-
-// Tests that we generate the correct file stats.
-TEST_F(DiskCacheTest, BlockFiles_Stats) {
-  ASSERT_TRUE(CopyTestCache("remove_load1"));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(false));
-  int used, load;
-
-  files.GetFileStats(0, &used, &load);
-  EXPECT_EQ(101, used);
-  EXPECT_EQ(9, load);
-
-  files.GetFileStats(1, &used, &load);
-  EXPECT_EQ(203, used);
-  EXPECT_EQ(19, load);
-
-  files.GetFileStats(2, &used, &load);
-  EXPECT_EQ(0, used);
-  EXPECT_EQ(0, load);
-}
-
-// Tests that we add and remove blocks correctly.
-TEST_F(DiskCacheTest, AllocationMap) {
-  ASSERT_TRUE(CleanupCacheDir());
-  ASSERT_TRUE(file_util::CreateDirectory(cache_path_));
-
-  BlockFiles files(cache_path_);
-  ASSERT_TRUE(files.Init(true));
+  block_bitmaps.Init(bitmaps);
 
   // Create a bunch of entries.
   const int kSize = 100;
-  Addr address[kSize];
+  disk_cache::Addr address[kSize];
   for (int i = 0; i < kSize; i++) {
     SCOPED_TRACE(i);
     int block_size = i % 4 + 1;
-    EXPECT_TRUE(files.CreateBlock(BLOCK_1K, block_size, &address[i]));
-    EXPECT_EQ(BLOCK_1K, address[i].file_type());
+    EXPECT_TRUE(block_bitmaps.CreateBlock(disk_cache::BLOCK_1K, block_size,
+                                          &address[i]));
+    EXPECT_EQ(disk_cache::BLOCK_1K, address[i].file_type());
     EXPECT_EQ(block_size, address[i].num_blocks());
     int start = address[i].start_block();
     EXPECT_EQ(start / 4, (start + block_size - 1) / 4);
   }
 
   for (int i = 0; i < kSize; i++) {
     SCOPED_TRACE(i);
-    EXPECT_TRUE(files.IsValid(address[i]));
+    EXPECT_TRUE(block_bitmaps.IsValid(address[i]));
   }
 
   // The first part of the allocation map should be completely filled. We used
-  // 10 bits per each four entries, so 250 bits total.
-  BlockFileHeader* header =
-      reinterpret_cast<BlockFileHeader*>(files.GetFile(address[0])->buffer());
-  uint8* buffer = reinterpret_cast<uint8*>(&header->allocation_map);
+  // 10 bits per each four entries, so 250 bits total. All entries should go to
+  // the third file.
+  uint8* buffer = reinterpret_cast<uint8*>(&headers[2].allocation_map);
   for (int i =0; i < 29; i++) {
     SCOPED_TRACE(i);
     EXPECT_EQ(0xff, buffer[i]);
   }
 
   for (int i = 0; i < kSize; i++) {
     SCOPED_TRACE(i);
-    files.DeleteBlock(address[i], false);
+    block_bitmaps.DeleteBlock(address[i]);
   }
 
   // The allocation map should be empty.
   for (int i =0; i < 50; i++) {
     SCOPED_TRACE(i);
     EXPECT_EQ(0, buffer[i]);
   }
 }
-
-}  // namespace disk_cache