1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/file_util.h"
6 #include "net/disk_cache/block_files.h"
7 #include "net/disk_cache/disk_cache.h"
8 #include "net/disk_cache/disk_cache_test_base.h"
9 #include "net/disk_cache/disk_cache_test_util.h"
10 #include "testing/gtest/include/gtest/gtest.h"
11
12 using base::Time;
13
14 namespace {
15
16 // Returns the number of files in this folder.
NumberOfFiles(const FilePath & path)17 int NumberOfFiles(const FilePath& path) {
18 file_util::FileEnumerator iter(path, false, file_util::FileEnumerator::FILES);
19 int count = 0;
20 for (FilePath file = iter.Next(); !file.value().empty(); file = iter.Next()) {
21 count++;
22 }
23 return count;
24 }
25
26 } // namespace;
27
28 namespace disk_cache {
29
TEST_F(DiskCacheTest,BlockFiles_Grow)30 TEST_F(DiskCacheTest, BlockFiles_Grow) {
31 FilePath path = GetCacheFilePath();
32 ASSERT_TRUE(DeleteCache(path));
33 ASSERT_TRUE(file_util::CreateDirectory(path));
34
35 BlockFiles files(path);
36 ASSERT_TRUE(files.Init(true));
37
38 const int kMaxSize = 35000;
39 Addr address[kMaxSize];
40
41 // Fill up the 32-byte block file (use three files).
42 for (int i = 0; i < kMaxSize; i++) {
43 EXPECT_TRUE(files.CreateBlock(RANKINGS, 4, &address[i]));
44 }
45 EXPECT_EQ(6, NumberOfFiles(path));
46
47 // Make sure we don't keep adding files.
48 for (int i = 0; i < kMaxSize * 4; i += 2) {
49 int target = i % kMaxSize;
50 files.DeleteBlock(address[target], false);
51 EXPECT_TRUE(files.CreateBlock(RANKINGS, 4, &address[target]));
52 }
53 EXPECT_EQ(6, NumberOfFiles(path));
54 }
55
56 // We should be able to delete empty block files.
TEST_F(DiskCacheTest,BlockFiles_Shrink)57 TEST_F(DiskCacheTest, BlockFiles_Shrink) {
58 FilePath path = GetCacheFilePath();
59 ASSERT_TRUE(DeleteCache(path));
60 ASSERT_TRUE(file_util::CreateDirectory(path));
61
62 BlockFiles files(path);
63 ASSERT_TRUE(files.Init(true));
64
65 const int kMaxSize = 35000;
66 Addr address[kMaxSize];
67
68 // Fill up the 32-byte block file (use three files).
69 for (int i = 0; i < kMaxSize; i++) {
70 EXPECT_TRUE(files.CreateBlock(RANKINGS, 4, &address[i]));
71 }
72
73 // Now delete all the blocks, so that we can delete the two extra files.
74 for (int i = 0; i < kMaxSize; i++) {
75 files.DeleteBlock(address[i], false);
76 }
77 EXPECT_EQ(4, NumberOfFiles(path));
78 }
79
80 // Handling of block files not properly closed.
TEST_F(DiskCacheTest,BlockFiles_Recover)81 TEST_F(DiskCacheTest, BlockFiles_Recover) {
82 FilePath path = GetCacheFilePath();
83 ASSERT_TRUE(DeleteCache(path));
84 ASSERT_TRUE(file_util::CreateDirectory(path));
85
86 BlockFiles files(path);
87 ASSERT_TRUE(files.Init(true));
88
89 const int kNumEntries = 2000;
90 CacheAddr entries[kNumEntries];
91
92 int seed = static_cast<int>(Time::Now().ToInternalValue());
93 srand(seed);
94 for (int i = 0; i < kNumEntries; i++) {
95 Addr address(0);
96 int size = (rand() % 4) + 1;
97 EXPECT_TRUE(files.CreateBlock(RANKINGS, size, &address));
98 entries[i] = address.value();
99 }
100
101 for (int i = 0; i < kNumEntries; i++) {
102 int source1 = rand() % kNumEntries;
103 int source2 = rand() % kNumEntries;
104 CacheAddr temp = entries[source1];
105 entries[source1] = entries[source2];
106 entries[source2] = temp;
107 }
108
109 for (int i = 0; i < kNumEntries / 2; i++) {
110 Addr address(entries[i]);
111 files.DeleteBlock(address, false);
112 }
113
114 // At this point, there are kNumEntries / 2 entries on the file, randomly
115 // distributed both on location and size.
116
117 Addr address(entries[kNumEntries / 2]);
118 MappedFile* file = files.GetFile(address);
119 ASSERT_TRUE(NULL != file);
120
121 BlockFileHeader* header =
122 reinterpret_cast<BlockFileHeader*>(file->buffer());
123 ASSERT_TRUE(NULL != header);
124
125 ASSERT_EQ(0, header->updating);
126
127 int max_entries = header->max_entries;
128 int empty_1 = header->empty[0];
129 int empty_2 = header->empty[1];
130 int empty_3 = header->empty[2];
131 int empty_4 = header->empty[3];
132
133 // Corrupt the file.
134 header->max_entries = header->empty[0] = 0;
135 header->empty[1] = header->empty[2] = header->empty[3] = 0;
136 header->updating = -1;
137
138 files.CloseFiles();
139
140 ASSERT_TRUE(files.Init(false));
141
142 // The file must have been fixed.
143 file = files.GetFile(address);
144 ASSERT_TRUE(NULL != file);
145
146 header = reinterpret_cast<BlockFileHeader*>(file->buffer());
147 ASSERT_TRUE(NULL != header);
148
149 ASSERT_EQ(0, header->updating);
150
151 EXPECT_EQ(max_entries, header->max_entries);
152 EXPECT_EQ(empty_1, header->empty[0]);
153 EXPECT_EQ(empty_2, header->empty[1]);
154 EXPECT_EQ(empty_3, header->empty[2]);
155 EXPECT_EQ(empty_4, header->empty[3]);
156 }
157
158 // Handling of truncated files.
TEST_F(DiskCacheTest,BlockFiles_ZeroSizeFile)159 TEST_F(DiskCacheTest, BlockFiles_ZeroSizeFile) {
160 FilePath path = GetCacheFilePath();
161 ASSERT_TRUE(DeleteCache(path));
162 ASSERT_TRUE(file_util::CreateDirectory(path));
163
164 BlockFiles files(path);
165 ASSERT_TRUE(files.Init(true));
166
167 FilePath filename = files.Name(0);
168 files.CloseFiles();
169 // Truncate one of the files.
170 {
171 scoped_refptr<File> file(new File);
172 ASSERT_TRUE(file->Init(filename));
173 EXPECT_TRUE(file->SetLength(0));
174 }
175
176 // Initializing should fail, not crash.
177 ASSERT_FALSE(files.Init(false));
178 }
179
180 // An invalid file can be detected after init.
TEST_F(DiskCacheTest,BlockFiles_InvalidFile)181 TEST_F(DiskCacheTest, BlockFiles_InvalidFile) {
182 FilePath path = GetCacheFilePath();
183 ASSERT_TRUE(DeleteCache(path));
184 ASSERT_TRUE(file_util::CreateDirectory(path));
185
186 BlockFiles files(path);
187 ASSERT_TRUE(files.Init(true));
188
189 // Let's access block 10 of file 5. (There is no file).
190 Addr addr(BLOCK_256, 1, 5, 10);
191 EXPECT_TRUE(NULL == files.GetFile(addr));
192
193 // Let's create an invalid file.
194 FilePath filename(files.Name(5));
195 char header[kBlockHeaderSize];
196 memset(header, 'a', kBlockHeaderSize);
197 EXPECT_EQ(kBlockHeaderSize,
198 file_util::WriteFile(filename, header, kBlockHeaderSize));
199
200 EXPECT_TRUE(NULL == files.GetFile(addr));
201
202 // The file should not have been cached (it is still invalid).
203 EXPECT_TRUE(NULL == files.GetFile(addr));
204 }
205
206 } // namespace disk_cache
207