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| 1 // Copyright (c) 2012 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 "webkit/browser/fileapi/file_system_usage_cache.h" | |
| 6 | |
| 7 #include <utility> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/debug/trace_event.h" | |
| 11 #include "base/file_util.h" | |
| 12 #include "base/files/file_path.h" | |
| 13 #include "base/pickle.h" | |
| 14 #include "base/stl_util.h" | |
| 15 #include "webkit/browser/fileapi/timed_task_helper.h" | |
| 16 | |
| 17 namespace storage { | |
| 18 | |
| 19 namespace { | |
| 20 const int64 kCloseDelaySeconds = 5; | |
| 21 const size_t kMaxHandleCacheSize = 2; | |
| 22 } // namespace | |
| 23 | |
| 24 FileSystemUsageCache::FileSystemUsageCache( | |
| 25 base::SequencedTaskRunner* task_runner) | |
| 26 : task_runner_(task_runner), | |
| 27 weak_factory_(this) { | |
| 28 } | |
| 29 | |
| 30 FileSystemUsageCache::~FileSystemUsageCache() { | |
| 31 task_runner_ = NULL; | |
| 32 CloseCacheFiles(); | |
| 33 } | |
| 34 | |
| 35 const base::FilePath::CharType FileSystemUsageCache::kUsageFileName[] = | |
| 36 FILE_PATH_LITERAL(".usage"); | |
| 37 const char FileSystemUsageCache::kUsageFileHeader[] = "FSU5"; | |
| 38 const int FileSystemUsageCache::kUsageFileHeaderSize = 4; | |
| 39 | |
| 40 // Pickle::{Read,Write}Bool treat bool as int | |
| 41 const int FileSystemUsageCache::kUsageFileSize = | |
| 42 sizeof(Pickle::Header) + | |
| 43 FileSystemUsageCache::kUsageFileHeaderSize + | |
| 44 sizeof(int) + sizeof(int32) + sizeof(int64); // NOLINT | |
| 45 | |
| 46 bool FileSystemUsageCache::GetUsage(const base::FilePath& usage_file_path, | |
| 47 int64* usage_out) { | |
| 48 TRACE_EVENT0("FileSystem", "UsageCache::GetUsage"); | |
| 49 DCHECK(CalledOnValidThread()); | |
| 50 DCHECK(usage_out); | |
| 51 bool is_valid = true; | |
| 52 uint32 dirty = 0; | |
| 53 int64 usage = 0; | |
| 54 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 55 return false; | |
| 56 *usage_out = usage; | |
| 57 return true; | |
| 58 } | |
| 59 | |
| 60 bool FileSystemUsageCache::GetDirty(const base::FilePath& usage_file_path, | |
| 61 uint32* dirty_out) { | |
| 62 TRACE_EVENT0("FileSystem", "UsageCache::GetDirty"); | |
| 63 DCHECK(CalledOnValidThread()); | |
| 64 DCHECK(dirty_out); | |
| 65 bool is_valid = true; | |
| 66 uint32 dirty = 0; | |
| 67 int64 usage = 0; | |
| 68 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 69 return false; | |
| 70 *dirty_out = dirty; | |
| 71 return true; | |
| 72 } | |
| 73 | |
| 74 bool FileSystemUsageCache::IncrementDirty( | |
| 75 const base::FilePath& usage_file_path) { | |
| 76 TRACE_EVENT0("FileSystem", "UsageCache::IncrementDirty"); | |
| 77 DCHECK(CalledOnValidThread()); | |
| 78 bool is_valid = true; | |
| 79 uint32 dirty = 0; | |
| 80 int64 usage = 0; | |
| 81 bool new_handle = !HasCacheFileHandle(usage_file_path); | |
| 82 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 83 return false; | |
| 84 | |
| 85 bool success = Write(usage_file_path, is_valid, dirty + 1, usage); | |
| 86 if (success && dirty == 0 && new_handle) | |
| 87 FlushFile(usage_file_path); | |
| 88 return success; | |
| 89 } | |
| 90 | |
| 91 bool FileSystemUsageCache::DecrementDirty( | |
| 92 const base::FilePath& usage_file_path) { | |
| 93 TRACE_EVENT0("FileSystem", "UsageCache::DecrementDirty"); | |
| 94 DCHECK(CalledOnValidThread()); | |
| 95 bool is_valid = true; | |
| 96 uint32 dirty = 0; | |
| 97 int64 usage = 0; | |
| 98 if (!Read(usage_file_path, &is_valid, &dirty, &usage) || dirty <= 0) | |
| 99 return false; | |
| 100 | |
| 101 if (dirty <= 0) | |
| 102 return false; | |
| 103 | |
| 104 return Write(usage_file_path, is_valid, dirty - 1, usage); | |
| 105 } | |
| 106 | |
| 107 bool FileSystemUsageCache::Invalidate(const base::FilePath& usage_file_path) { | |
| 108 TRACE_EVENT0("FileSystem", "UsageCache::Invalidate"); | |
| 109 DCHECK(CalledOnValidThread()); | |
| 110 bool is_valid = true; | |
| 111 uint32 dirty = 0; | |
| 112 int64 usage = 0; | |
| 113 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 114 return false; | |
| 115 | |
| 116 return Write(usage_file_path, false, dirty, usage); | |
| 117 } | |
| 118 | |
| 119 bool FileSystemUsageCache::IsValid(const base::FilePath& usage_file_path) { | |
| 120 TRACE_EVENT0("FileSystem", "UsageCache::IsValid"); | |
| 121 DCHECK(CalledOnValidThread()); | |
| 122 bool is_valid = true; | |
| 123 uint32 dirty = 0; | |
| 124 int64 usage = 0; | |
| 125 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 126 return false; | |
| 127 return is_valid; | |
| 128 } | |
| 129 | |
| 130 bool FileSystemUsageCache::AtomicUpdateUsageByDelta( | |
| 131 const base::FilePath& usage_file_path, int64 delta) { | |
| 132 TRACE_EVENT0("FileSystem", "UsageCache::AtomicUpdateUsageByDelta"); | |
| 133 DCHECK(CalledOnValidThread()); | |
| 134 bool is_valid = true; | |
| 135 uint32 dirty = 0; | |
| 136 int64 usage = 0;; | |
| 137 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 138 return false; | |
| 139 return Write(usage_file_path, is_valid, dirty, usage + delta); | |
| 140 } | |
| 141 | |
| 142 bool FileSystemUsageCache::UpdateUsage(const base::FilePath& usage_file_path, | |
| 143 int64 fs_usage) { | |
| 144 TRACE_EVENT0("FileSystem", "UsageCache::UpdateUsage"); | |
| 145 DCHECK(CalledOnValidThread()); | |
| 146 return Write(usage_file_path, true, 0, fs_usage); | |
| 147 } | |
| 148 | |
| 149 bool FileSystemUsageCache::Exists(const base::FilePath& usage_file_path) { | |
| 150 TRACE_EVENT0("FileSystem", "UsageCache::Exists"); | |
| 151 DCHECK(CalledOnValidThread()); | |
| 152 return base::PathExists(usage_file_path); | |
| 153 } | |
| 154 | |
| 155 bool FileSystemUsageCache::Delete(const base::FilePath& usage_file_path) { | |
| 156 TRACE_EVENT0("FileSystem", "UsageCache::Delete"); | |
| 157 DCHECK(CalledOnValidThread()); | |
| 158 CloseCacheFiles(); | |
| 159 return base::DeleteFile(usage_file_path, true); | |
| 160 } | |
| 161 | |
| 162 void FileSystemUsageCache::CloseCacheFiles() { | |
| 163 TRACE_EVENT0("FileSystem", "UsageCache::CloseCacheFiles"); | |
| 164 DCHECK(CalledOnValidThread()); | |
| 165 STLDeleteValues(&cache_files_); | |
| 166 timer_.reset(); | |
| 167 } | |
| 168 | |
| 169 bool FileSystemUsageCache::Read(const base::FilePath& usage_file_path, | |
| 170 bool* is_valid, | |
| 171 uint32* dirty_out, | |
| 172 int64* usage_out) { | |
| 173 TRACE_EVENT0("FileSystem", "UsageCache::Read"); | |
| 174 DCHECK(CalledOnValidThread()); | |
| 175 DCHECK(is_valid); | |
| 176 DCHECK(dirty_out); | |
| 177 DCHECK(usage_out); | |
| 178 char buffer[kUsageFileSize]; | |
| 179 const char *header; | |
| 180 if (usage_file_path.empty() || | |
| 181 !ReadBytes(usage_file_path, buffer, kUsageFileSize)) | |
| 182 return false; | |
| 183 Pickle read_pickle(buffer, kUsageFileSize); | |
| 184 PickleIterator iter(read_pickle); | |
| 185 uint32 dirty = 0; | |
| 186 int64 usage = 0; | |
| 187 | |
| 188 if (!read_pickle.ReadBytes(&iter, &header, kUsageFileHeaderSize) || | |
| 189 !read_pickle.ReadBool(&iter, is_valid) || | |
| 190 !read_pickle.ReadUInt32(&iter, &dirty) || | |
| 191 !read_pickle.ReadInt64(&iter, &usage)) | |
| 192 return false; | |
| 193 | |
| 194 if (header[0] != kUsageFileHeader[0] || | |
| 195 header[1] != kUsageFileHeader[1] || | |
| 196 header[2] != kUsageFileHeader[2] || | |
| 197 header[3] != kUsageFileHeader[3]) | |
| 198 return false; | |
| 199 | |
| 200 *dirty_out = dirty; | |
| 201 *usage_out = usage; | |
| 202 return true; | |
| 203 } | |
| 204 | |
| 205 bool FileSystemUsageCache::Write(const base::FilePath& usage_file_path, | |
| 206 bool is_valid, | |
| 207 int32 dirty, | |
| 208 int64 usage) { | |
| 209 TRACE_EVENT0("FileSystem", "UsageCache::Write"); | |
| 210 DCHECK(CalledOnValidThread()); | |
| 211 Pickle write_pickle; | |
| 212 write_pickle.WriteBytes(kUsageFileHeader, kUsageFileHeaderSize); | |
| 213 write_pickle.WriteBool(is_valid); | |
| 214 write_pickle.WriteUInt32(dirty); | |
| 215 write_pickle.WriteInt64(usage); | |
| 216 | |
| 217 if (!WriteBytes(usage_file_path, | |
| 218 static_cast<const char*>(write_pickle.data()), | |
| 219 write_pickle.size())) { | |
| 220 Delete(usage_file_path); | |
| 221 return false; | |
| 222 } | |
| 223 return true; | |
| 224 } | |
| 225 | |
| 226 base::File* FileSystemUsageCache::GetFile(const base::FilePath& file_path) { | |
| 227 DCHECK(CalledOnValidThread()); | |
| 228 if (cache_files_.size() >= kMaxHandleCacheSize) | |
| 229 CloseCacheFiles(); | |
| 230 ScheduleCloseTimer(); | |
| 231 | |
| 232 base::File* new_file = NULL; | |
| 233 std::pair<CacheFiles::iterator, bool> inserted = | |
| 234 cache_files_.insert(std::make_pair(file_path, new_file)); | |
| 235 if (!inserted.second) | |
| 236 return inserted.first->second; | |
| 237 | |
| 238 new_file = new base::File(file_path, | |
| 239 base::File::FLAG_OPEN_ALWAYS | | |
| 240 base::File::FLAG_READ | | |
| 241 base::File::FLAG_WRITE); | |
| 242 if (!new_file->IsValid()) { | |
| 243 cache_files_.erase(inserted.first); | |
| 244 delete new_file; | |
| 245 return NULL; | |
| 246 } | |
| 247 | |
| 248 inserted.first->second = new_file; | |
| 249 return new_file; | |
| 250 } | |
| 251 | |
| 252 bool FileSystemUsageCache::ReadBytes(const base::FilePath& file_path, | |
| 253 char* buffer, | |
| 254 int64 buffer_size) { | |
| 255 DCHECK(CalledOnValidThread()); | |
| 256 base::File* file = GetFile(file_path); | |
| 257 if (!file) | |
| 258 return false; | |
| 259 return file->Read(0, buffer, buffer_size) == buffer_size; | |
| 260 } | |
| 261 | |
| 262 bool FileSystemUsageCache::WriteBytes(const base::FilePath& file_path, | |
| 263 const char* buffer, | |
| 264 int64 buffer_size) { | |
| 265 DCHECK(CalledOnValidThread()); | |
| 266 base::File* file = GetFile(file_path); | |
| 267 if (!file) | |
| 268 return false; | |
| 269 return file->Write(0, buffer, buffer_size) == buffer_size; | |
| 270 } | |
| 271 | |
| 272 bool FileSystemUsageCache::FlushFile(const base::FilePath& file_path) { | |
| 273 TRACE_EVENT0("FileSystem", "UsageCache::FlushFile"); | |
| 274 DCHECK(CalledOnValidThread()); | |
| 275 base::File* file = GetFile(file_path); | |
| 276 if (!file) | |
| 277 return false; | |
| 278 return file->Flush(); | |
| 279 } | |
| 280 | |
| 281 void FileSystemUsageCache::ScheduleCloseTimer() { | |
| 282 DCHECK(CalledOnValidThread()); | |
| 283 if (!timer_) | |
| 284 timer_.reset(new TimedTaskHelper(task_runner_.get())); | |
| 285 | |
| 286 if (timer_->IsRunning()) { | |
| 287 timer_->Reset(); | |
| 288 return; | |
| 289 } | |
| 290 | |
| 291 timer_->Start(FROM_HERE, | |
| 292 base::TimeDelta::FromSeconds(kCloseDelaySeconds), | |
| 293 base::Bind(&FileSystemUsageCache::CloseCacheFiles, | |
| 294 weak_factory_.GetWeakPtr())); | |
| 295 } | |
| 296 | |
| 297 bool FileSystemUsageCache::CalledOnValidThread() { | |
| 298 return !task_runner_.get() || task_runner_->RunsTasksOnCurrentThread(); | |
| 299 } | |
| 300 | |
| 301 bool FileSystemUsageCache::HasCacheFileHandle(const base::FilePath& file_path) { | |
| 302 DCHECK(CalledOnValidThread()); | |
| 303 DCHECK_LE(cache_files_.size(), kMaxHandleCacheSize); | |
| 304 return ContainsKey(cache_files_, file_path); | |
| 305 } | |
| 306 | |
| 307 } // namespace storage | |
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Chromium Code Reviews
Issue 539143002:
Migrate webkit/browser/ to storage/browser/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master