src/webkit/browser/database/database_tracker.cc

   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/database/database_tracker.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "base/bind.h"
  12 #include "base/file_util.h"
  13 #include "base/files/file.h"
  14 #include "base/files/file_enumerator.h"
  15 #include "base/message_loop/message_loop_proxy.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "net/base/net_errors.h"
  19 #include "sql/connection.h"
  20 #include "sql/meta_table.h"
  21 #include "sql/transaction.h"
  22 #include "third_party/sqlite/sqlite3.h"
  23 #include "webkit/browser/database/database_quota_client.h"
  24 #include "webkit/browser/database/database_util.h"
  25 #include "webkit/browser/database/databases_table.h"
  26 #include "webkit/browser/quota/quota_manager_proxy.h"
  27 #include "webkit/browser/quota/special_storage_policy.h"
  28 #include "webkit/common/database/database_identifier.h"
  29
  30 namespace webkit_database {
  31
  32 const base::FilePath::CharType kDatabaseDirectoryName[] =
  33     FILE_PATH_LITERAL("databases");
  34 const base::FilePath::CharType kIncognitoDatabaseDirectoryName[] =
  35     FILE_PATH_LITERAL("databases-incognito");
  36 const base::FilePath::CharType kTrackerDatabaseFileName[] =
  37     FILE_PATH_LITERAL("Databases.db");
  38 static const int kCurrentVersion = 2;
  39 static const int kCompatibleVersion = 1;
  40
  41 const base::FilePath::CharType kTemporaryDirectoryPrefix[] =
  42     FILE_PATH_LITERAL("DeleteMe");
  43 const base::FilePath::CharType kTemporaryDirectoryPattern[] =
  44     FILE_PATH_LITERAL("DeleteMe*");
  45
  46 OriginInfo::OriginInfo()
  47     : total_size_(0) {}
  48
  49 OriginInfo::OriginInfo(const OriginInfo& origin_info)
  50     : origin_identifier_(origin_info.origin_identifier_),
  51       total_size_(origin_info.total_size_),
  52       database_info_(origin_info.database_info_) {}
  53
  54 OriginInfo::~OriginInfo() {}
  55
  56 void OriginInfo::GetAllDatabaseNames(
  57     std::vector<base::string16>* databases) const {
  58   for (DatabaseInfoMap::const_iterator it = database_info_.begin();
  59        it != database_info_.end(); it++) {
  60     databases->push_back(it->first);
  61   }
  62 }
  63
  64 int64 OriginInfo::GetDatabaseSize(const base::string16& database_name) const {
  65   DatabaseInfoMap::const_iterator it = database_info_.find(database_name);
  66   if (it != database_info_.end())
  67     return it->second.first;
  68   return 0;
  69 }
  70
  71 base::string16 OriginInfo::GetDatabaseDescription(
  72     const base::string16& database_name) const {
  73   DatabaseInfoMap::const_iterator it = database_info_.find(database_name);
  74   if (it != database_info_.end())
  75     return it->second.second;
  76   return base::string16();
  77 }
  78
  79 OriginInfo::OriginInfo(const std::string& origin_identifier, int64 total_size)
  80     : origin_identifier_(origin_identifier), total_size_(total_size) {}
  81
  82 DatabaseTracker::DatabaseTracker(
  83     const base::FilePath& profile_path,
  84     bool is_incognito,
  85     quota::SpecialStoragePolicy* special_storage_policy,
  86     quota::QuotaManagerProxy* quota_manager_proxy,
  87     base::MessageLoopProxy* db_tracker_thread)
  88     : is_initialized_(false),
  89       is_incognito_(is_incognito),
  90       force_keep_session_state_(false),
  91       shutting_down_(false),
  92       profile_path_(profile_path),
  93       db_dir_(is_incognito_
  94                   ? profile_path_.Append(kIncognitoDatabaseDirectoryName)
  95                   : profile_path_.Append(kDatabaseDirectoryName)),
  96       db_(new sql::Connection()),
  97       special_storage_policy_(special_storage_policy),
  98       quota_manager_proxy_(quota_manager_proxy),
  99       db_tracker_thread_(db_tracker_thread),
 100       incognito_origin_directories_generator_(0) {
 101   if (quota_manager_proxy) {
 102     quota_manager_proxy->RegisterClient(
 103         new DatabaseQuotaClient(db_tracker_thread, this));
 104   }
 105 }
 106
 107 DatabaseTracker::~DatabaseTracker() {
 108   DCHECK(dbs_to_be_deleted_.empty());
 109   DCHECK(deletion_callbacks_.empty());
 110 }
 111
 112 void DatabaseTracker::DatabaseOpened(const std::string& origin_identifier,
 113                                      const base::string16& database_name,
 114                                      const base::string16& database_description,
 115                                      int64 estimated_size,
 116                                      int64* database_size) {
 117   if (shutting_down_ || !LazyInit()) {
 118     *database_size = 0;
 119     return;
 120   }
 121
 122   if (quota_manager_proxy_.get())
 123     quota_manager_proxy_->NotifyStorageAccessed(
 124         quota::QuotaClient::kDatabase,
 125         webkit_database::GetOriginFromIdentifier(origin_identifier),
 126         quota::kStorageTypeTemporary);
 127
 128   InsertOrUpdateDatabaseDetails(origin_identifier, database_name,
 129                                 database_description, estimated_size);
 130   if (database_connections_.AddConnection(origin_identifier, database_name)) {
 131     *database_size = SeedOpenDatabaseInfo(origin_identifier,
 132                                           database_name,
 133                                           database_description);
 134     return;
 135   }
 136   *database_size  = UpdateOpenDatabaseInfoAndNotify(origin_identifier,
 137                                                     database_name,
 138                                                     &database_description);
 139 }
 140
 141 void DatabaseTracker::DatabaseModified(const std::string& origin_identifier,
 142                                        const base::string16& database_name) {
 143   if (!LazyInit())
 144     return;
 145   UpdateOpenDatabaseSizeAndNotify(origin_identifier, database_name);
 146 }
 147
 148 void DatabaseTracker::DatabaseClosed(const std::string& origin_identifier,
 149                                      const base::string16& database_name) {
 150   if (database_connections_.IsEmpty()) {
 151     DCHECK(!is_initialized_);
 152     return;
 153   }
 154
 155   // We call NotifiyStorageAccessed when a db is opened and also when
 156   // closed because we don't call it for read while open.
 157   if (quota_manager_proxy_.get())
 158     quota_manager_proxy_->NotifyStorageAccessed(
 159         quota::QuotaClient::kDatabase,
 160         webkit_database::GetOriginFromIdentifier(origin_identifier),
 161         quota::kStorageTypeTemporary);
 162
 163   UpdateOpenDatabaseSizeAndNotify(origin_identifier, database_name);
 164   if (database_connections_.RemoveConnection(origin_identifier, database_name))
 165     DeleteDatabaseIfNeeded(origin_identifier, database_name);
 166 }
 167
 168 void DatabaseTracker::HandleSqliteError(
 169     const std::string& origin_identifier,
 170     const base::string16& database_name,
 171     int error) {
 172   // We only handle errors that indicate corruption and we
 173   // do so with a heavy hand, we delete it. Any renderers/workers
 174   // with this database open will receive a message to close it
 175   // immediately, once all have closed, the files will be deleted.
 176   // In the interim, all attempts to open a new connection to that
 177   // database will fail.
 178   // Note: the client-side filters out all but these two errors as
 179   // a small optimization, see WebDatabaseObserverImpl::HandleSqliteError.
 180   if (error == SQLITE_CORRUPT || error == SQLITE_NOTADB) {
 181     DeleteDatabase(origin_identifier, database_name,
 182                    net::CompletionCallback());
 183   }
 184 }
 185
 186 void DatabaseTracker::CloseDatabases(const DatabaseConnections& connections) {
 187   if (database_connections_.IsEmpty()) {
 188     DCHECK(!is_initialized_ || connections.IsEmpty());
 189     return;
 190   }
 191
 192   // When being closed by this route, there's a chance that
 193   // the tracker missed some DatabseModified calls. This method is used
 194   // when a renderer crashes to cleanup its open resources.
 195   // We need to examine what we have in connections for the
 196   // size of each open databases and notify any differences between the
 197   // actual file sizes now.
 198   std::vector<std::pair<std::string, base::string16> > open_dbs;
 199   connections.ListConnections(&open_dbs);
 200   for (std::vector<std::pair<std::string, base::string16> >::iterator it =
 201            open_dbs.begin(); it != open_dbs.end(); ++it)
 202     UpdateOpenDatabaseSizeAndNotify(it->first, it->second);
 203
 204   std::vector<std::pair<std::string, base::string16> > closed_dbs;
 205   database_connections_.RemoveConnections(connections, &closed_dbs);
 206   for (std::vector<std::pair<std::string, base::string16> >::iterator it =
 207            closed_dbs.begin(); it != closed_dbs.end(); ++it) {
 208     DeleteDatabaseIfNeeded(it->first, it->second);
 209   }
 210 }
 211
 212 void DatabaseTracker::DeleteDatabaseIfNeeded(
 213     const std::string& origin_identifier,
 214     const base::string16& database_name) {
 215   DCHECK(!database_connections_.IsDatabaseOpened(origin_identifier,
 216                                                  database_name));
 217   if (IsDatabaseScheduledForDeletion(origin_identifier, database_name)) {
 218     DeleteClosedDatabase(origin_identifier, database_name);
 219     dbs_to_be_deleted_[origin_identifier].erase(database_name);
 220     if (dbs_to_be_deleted_[origin_identifier].empty())
 221       dbs_to_be_deleted_.erase(origin_identifier);
 222
 223     PendingDeletionCallbacks::iterator callback = deletion_callbacks_.begin();
 224     while (callback != deletion_callbacks_.end()) {
 225       DatabaseSet::iterator found_origin =
 226           callback->second.find(origin_identifier);
 227       if (found_origin != callback->second.end()) {
 228         std::set<base::string16>& databases = found_origin->second;
 229         databases.erase(database_name);
 230         if (databases.empty()) {
 231           callback->second.erase(found_origin);
 232           if (callback->second.empty()) {
 233             net::CompletionCallback cb = callback->first;
 234             cb.Run(net::OK);
 235             callback = deletion_callbacks_.erase(callback);
 236             continue;
 237           }
 238         }
 239       }
 240
 241       ++callback;
 242     }
 243   }
 244 }
 245
 246 void DatabaseTracker::AddObserver(Observer* observer) {
 247   observers_.AddObserver(observer);
 248 }
 249
 250 void DatabaseTracker::RemoveObserver(Observer* observer) {
 251   // When we remove a listener, we do not know which cached information
 252   // is still needed and which information can be discarded. So we just
 253   // clear all caches and re-populate them as needed.
 254   observers_.RemoveObserver(observer);
 255   ClearAllCachedOriginInfo();
 256 }
 257
 258 void DatabaseTracker::CloseTrackerDatabaseAndClearCaches() {
 259   ClearAllCachedOriginInfo();
 260
 261   if (!is_incognito_) {
 262     meta_table_.reset(NULL);
 263     databases_table_.reset(NULL);
 264     db_->Close();
 265     is_initialized_ = false;
 266   }
 267 }
 268
 269 base::string16 DatabaseTracker::GetOriginDirectory(
 270     const std::string& origin_identifier) {
 271   if (!is_incognito_)
 272     return base::UTF8ToUTF16(origin_identifier);
 273
 274   OriginDirectoriesMap::const_iterator it =
 275       incognito_origin_directories_.find(origin_identifier);
 276   if (it != incognito_origin_directories_.end())
 277     return it->second;
 278
 279   base::string16 origin_directory =
 280       base::IntToString16(incognito_origin_directories_generator_++);
 281   incognito_origin_directories_[origin_identifier] = origin_directory;
 282   return origin_directory;
 283 }
 284
 285 base::FilePath DatabaseTracker::GetFullDBFilePath(
 286     const std::string& origin_identifier,
 287     const base::string16& database_name) {
 288   DCHECK(!origin_identifier.empty());
 289   if (!LazyInit())
 290     return base::FilePath();
 291
 292   int64 id = databases_table_->GetDatabaseID(origin_identifier, database_name);
 293   if (id < 0)
 294     return base::FilePath();
 295
 296   return db_dir_.Append(base::FilePath::FromUTF16Unsafe(
 297       GetOriginDirectory(origin_identifier))).AppendASCII(
 298           base::Int64ToString(id));
 299 }
 300
 301 bool DatabaseTracker::GetOriginInfo(const std::string& origin_identifier,
 302                                     OriginInfo* info) {
 303   DCHECK(info);
 304   CachedOriginInfo* cached_info = GetCachedOriginInfo(origin_identifier);
 305   if (!cached_info)
 306     return false;
 307   *info = OriginInfo(*cached_info);
 308   return true;
 309 }
 310
 311 bool DatabaseTracker::GetAllOriginIdentifiers(
 312     std::vector<std::string>* origin_identifiers) {
 313   DCHECK(origin_identifiers);
 314   DCHECK(origin_identifiers->empty());
 315   if (!LazyInit())
 316     return false;
 317   return databases_table_->GetAllOriginIdentifiers(origin_identifiers);
 318 }
 319
 320 bool DatabaseTracker::GetAllOriginsInfo(
 321     std::vector<OriginInfo>* origins_info) {
 322   DCHECK(origins_info);
 323   DCHECK(origins_info->empty());
 324
 325   std::vector<std::string> origins;
 326   if (!GetAllOriginIdentifiers(&origins))
 327     return false;
 328
 329   for (std::vector<std::string>::const_iterator it = origins.begin();
 330        it != origins.end(); it++) {
 331     CachedOriginInfo* origin_info = GetCachedOriginInfo(*it);
 332     if (!origin_info) {
 333       // Restore 'origins_info' to its initial state.
 334       origins_info->clear();
 335       return false;
 336     }
 337     origins_info->push_back(OriginInfo(*origin_info));
 338   }
 339
 340   return true;
 341 }
 342
 343 bool DatabaseTracker::DeleteClosedDatabase(
 344     const std::string& origin_identifier,
 345     const base::string16& database_name) {
 346   if (!LazyInit())
 347     return false;
 348
 349   // Check if the database is opened by any renderer.
 350   if (database_connections_.IsDatabaseOpened(origin_identifier, database_name))
 351     return false;
 352
 353   int64 db_file_size = quota_manager_proxy_.get()
 354                            ? GetDBFileSize(origin_identifier, database_name)
 355                            : 0;
 356
 357   // Try to delete the file on the hard drive.
 358   base::FilePath db_file = GetFullDBFilePath(origin_identifier, database_name);
 359   if (!sql::Connection::Delete(db_file))
 360     return false;
 361
 362   if (quota_manager_proxy_.get() && db_file_size)
 363     quota_manager_proxy_->NotifyStorageModified(
 364         quota::QuotaClient::kDatabase,
 365         webkit_database::GetOriginFromIdentifier(origin_identifier),
 366         quota::kStorageTypeTemporary,
 367         -db_file_size);
 368
 369   // Clean up the main database and invalidate the cached record.
 370   databases_table_->DeleteDatabaseDetails(origin_identifier, database_name);
 371   origins_info_map_.erase(origin_identifier);
 372
 373   std::vector<DatabaseDetails> details;
 374   if (databases_table_->GetAllDatabaseDetailsForOriginIdentifier(
 375           origin_identifier, &details) && details.empty()) {
 376     // Try to delete the origin in case this was the last database.
 377     DeleteOrigin(origin_identifier, false);
 378   }
 379   return true;
 380 }
 381
 382 bool DatabaseTracker::DeleteOrigin(const std::string& origin_identifier,
 383                                    bool force) {
 384   if (!LazyInit())
 385     return false;
 386
 387   // Check if any database in this origin is opened by any renderer.
 388   if (database_connections_.IsOriginUsed(origin_identifier) && !force)
 389     return false;
 390
 391   int64 deleted_size = 0;
 392   if (quota_manager_proxy_.get()) {
 393     CachedOriginInfo* origin_info = GetCachedOriginInfo(origin_identifier);
 394     if (origin_info)
 395       deleted_size = origin_info->TotalSize();
 396   }
 397
 398   origins_info_map_.erase(origin_identifier);
 399   base::FilePath origin_dir = db_dir_.AppendASCII(origin_identifier);
 400
 401   // Create a temporary directory to move possibly still existing databases to,
 402   // as we can't delete the origin directory on windows if it contains opened
 403   // files.
 404   base::FilePath new_origin_dir;
 405   base::CreateTemporaryDirInDir(db_dir_,
 406                                 kTemporaryDirectoryPrefix,
 407                                 &new_origin_dir);
 408   base::FileEnumerator databases(
 409       origin_dir,
 410       false,
 411       base::FileEnumerator::FILES);
 412   for (base::FilePath database = databases.Next(); !database.empty();
 413        database = databases.Next()) {
 414     base::FilePath new_file = new_origin_dir.Append(database.BaseName());
 415     base::Move(database, new_file);
 416   }
 417   base::DeleteFile(origin_dir, true);
 418   base::DeleteFile(new_origin_dir, true); // might fail on windows.
 419
 420   databases_table_->DeleteOriginIdentifier(origin_identifier);
 421
 422   if (quota_manager_proxy_.get() && deleted_size) {
 423     quota_manager_proxy_->NotifyStorageModified(
 424         quota::QuotaClient::kDatabase,
 425         webkit_database::GetOriginFromIdentifier(origin_identifier),
 426         quota::kStorageTypeTemporary,
 427         -deleted_size);
 428   }
 429
 430   return true;
 431 }
 432
 433 bool DatabaseTracker::IsDatabaseScheduledForDeletion(
 434     const std::string& origin_identifier,
 435     const base::string16& database_name) {
 436   DatabaseSet::iterator it = dbs_to_be_deleted_.find(origin_identifier);
 437   if (it == dbs_to_be_deleted_.end())
 438     return false;
 439
 440   std::set<base::string16>& databases = it->second;
 441   return (databases.find(database_name) != databases.end());
 442 }
 443
 444 bool DatabaseTracker::LazyInit() {
 445   if (!is_initialized_ && !shutting_down_) {
 446     DCHECK(!db_->is_open());
 447     DCHECK(!databases_table_.get());
 448     DCHECK(!meta_table_.get());
 449
 450     // If there are left-over directories from failed deletion attempts, clean
 451     // them up.
 452     if (base::DirectoryExists(db_dir_)) {
 453       base::FileEnumerator directories(
 454           db_dir_,
 455           false,
 456           base::FileEnumerator::DIRECTORIES,
 457           kTemporaryDirectoryPattern);
 458       for (base::FilePath directory = directories.Next(); !directory.empty();
 459            directory = directories.Next()) {
 460         base::DeleteFile(directory, true);
 461       }
 462     }
 463
 464     // If the tracker database exists, but it's corrupt or doesn't
 465     // have a meta table, delete the database directory.
 466     const base::FilePath kTrackerDatabaseFullPath =
 467         db_dir_.Append(base::FilePath(kTrackerDatabaseFileName));
 468     if (base::DirectoryExists(db_dir_) &&
 469         base::PathExists(kTrackerDatabaseFullPath) &&
 470         (!db_->Open(kTrackerDatabaseFullPath) ||
 471          !sql::MetaTable::DoesTableExist(db_.get()))) {
 472       db_->Close();
 473       if (!base::DeleteFile(db_dir_, true))
 474         return false;
 475     }
 476
 477     db_->set_histogram_tag("DatabaseTracker");
 478
 479     databases_table_.reset(new DatabasesTable(db_.get()));
 480     meta_table_.reset(new sql::MetaTable());
 481
 482     is_initialized_ =
 483         base::CreateDirectory(db_dir_) &&
 484         (db_->is_open() ||
 485          (is_incognito_ ? db_->OpenInMemory() :
 486           db_->Open(kTrackerDatabaseFullPath))) &&
 487         UpgradeToCurrentVersion();
 488     if (!is_initialized_) {
 489       databases_table_.reset(NULL);
 490       meta_table_.reset(NULL);
 491       db_->Close();
 492     }
 493   }
 494   return is_initialized_;
 495 }
 496
 497 bool DatabaseTracker::UpgradeToCurrentVersion() {
 498   sql::Transaction transaction(db_.get());
 499   if (!transaction.Begin() ||
 500       !meta_table_->Init(db_.get(), kCurrentVersion, kCompatibleVersion) ||
 501       (meta_table_->GetCompatibleVersionNumber() > kCurrentVersion) ||
 502       !databases_table_->Init())
 503     return false;
 504
 505   if (meta_table_->GetVersionNumber() < kCurrentVersion)
 506     meta_table_->SetVersionNumber(kCurrentVersion);
 507
 508   return transaction.Commit();
 509 }
 510
 511 void DatabaseTracker::InsertOrUpdateDatabaseDetails(
 512     const std::string& origin_identifier,
 513     const base::string16& database_name,
 514     const base::string16& database_description,
 515     int64 estimated_size) {
 516   DatabaseDetails details;
 517   if (!databases_table_->GetDatabaseDetails(
 518           origin_identifier, database_name, &details)) {
 519     details.origin_identifier = origin_identifier;
 520     details.database_name = database_name;
 521     details.description = database_description;
 522     details.estimated_size = estimated_size;
 523     databases_table_->InsertDatabaseDetails(details);
 524   } else if ((details.description != database_description) ||
 525              (details.estimated_size != estimated_size)) {
 526     details.description = database_description;
 527     details.estimated_size = estimated_size;
 528     databases_table_->UpdateDatabaseDetails(details);
 529   }
 530 }
 531
 532 void DatabaseTracker::ClearAllCachedOriginInfo() {
 533   origins_info_map_.clear();
 534 }
 535
 536 DatabaseTracker::CachedOriginInfo* DatabaseTracker::MaybeGetCachedOriginInfo(
 537     const std::string& origin_identifier, bool create_if_needed) {
 538   if (!LazyInit())
 539     return NULL;
 540
 541   // Populate the cache with data for this origin if needed.
 542   if (origins_info_map_.find(origin_identifier) == origins_info_map_.end()) {
 543     if (!create_if_needed)
 544       return NULL;
 545
 546     std::vector<DatabaseDetails> details;
 547     if (!databases_table_->GetAllDatabaseDetailsForOriginIdentifier(
 548             origin_identifier, &details)) {
 549       return NULL;
 550     }
 551
 552     CachedOriginInfo& origin_info = origins_info_map_[origin_identifier];
 553     origin_info.SetOriginIdentifier(origin_identifier);
 554     for (std::vector<DatabaseDetails>::const_iterator it = details.begin();
 555          it != details.end(); it++) {
 556       int64 db_file_size;
 557       if (database_connections_.IsDatabaseOpened(
 558               origin_identifier, it->database_name)) {
 559         db_file_size = database_connections_.GetOpenDatabaseSize(
 560             origin_identifier, it->database_name);
 561       } else {
 562         db_file_size = GetDBFileSize(origin_identifier, it->database_name);
 563       }
 564       origin_info.SetDatabaseSize(it->database_name, db_file_size);
 565       origin_info.SetDatabaseDescription(it->database_name, it->description);
 566     }
 567   }
 568
 569   return &origins_info_map_[origin_identifier];
 570 }
 571
 572 int64 DatabaseTracker::GetDBFileSize(const std::string& origin_identifier,
 573                                      const base::string16& database_name) {
 574   base::FilePath db_file_name = GetFullDBFilePath(origin_identifier,
 575                                                   database_name);
 576   int64 db_file_size = 0;
 577   if (!base::GetFileSize(db_file_name, &db_file_size))
 578     db_file_size = 0;
 579   return db_file_size;
 580 }
 581
 582 int64 DatabaseTracker::SeedOpenDatabaseInfo(
 583     const std::string& origin_id, const base::string16& name,
 584     const base::string16& description) {
 585   DCHECK(database_connections_.IsDatabaseOpened(origin_id, name));
 586   int64 size = GetDBFileSize(origin_id, name);
 587   database_connections_.SetOpenDatabaseSize(origin_id, name,  size);
 588   CachedOriginInfo* info = MaybeGetCachedOriginInfo(origin_id, false);
 589   if (info) {
 590     info->SetDatabaseSize(name, size);
 591     info->SetDatabaseDescription(name, description);
 592   }
 593   return size;
 594 }
 595
 596 int64 DatabaseTracker::UpdateOpenDatabaseInfoAndNotify(
 597     const std::string& origin_id, const base::string16& name,
 598     const base::string16* opt_description) {
 599   DCHECK(database_connections_.IsDatabaseOpened(origin_id, name));
 600   int64 new_size = GetDBFileSize(origin_id, name);
 601   int64 old_size = database_connections_.GetOpenDatabaseSize(origin_id, name);
 602   CachedOriginInfo* info = MaybeGetCachedOriginInfo(origin_id, false);
 603   if (info && opt_description)
 604     info->SetDatabaseDescription(name, *opt_description);
 605   if (old_size != new_size) {
 606     database_connections_.SetOpenDatabaseSize(origin_id, name, new_size);
 607     if (info)
 608       info->SetDatabaseSize(name, new_size);
 609     if (quota_manager_proxy_.get())
 610       quota_manager_proxy_->NotifyStorageModified(
 611           quota::QuotaClient::kDatabase,
 612           webkit_database::GetOriginFromIdentifier(origin_id),
 613           quota::kStorageTypeTemporary,
 614           new_size - old_size);
 615     FOR_EACH_OBSERVER(Observer, observers_, OnDatabaseSizeChanged(
 616         origin_id, name, new_size));
 617   }
 618   return new_size;
 619 }
 620
 621 void DatabaseTracker::ScheduleDatabaseForDeletion(
 622     const std::string& origin_identifier,
 623     const base::string16& database_name) {
 624   DCHECK(database_connections_.IsDatabaseOpened(origin_identifier,
 625                                                 database_name));
 626   dbs_to_be_deleted_[origin_identifier].insert(database_name);
 627   FOR_EACH_OBSERVER(Observer, observers_, OnDatabaseScheduledForDeletion(
 628       origin_identifier, database_name));
 629 }
 630
 631 void DatabaseTracker::ScheduleDatabasesForDeletion(
 632     const DatabaseSet& databases,
 633     const net::CompletionCallback& callback) {
 634   DCHECK(!databases.empty());
 635
 636   if (!callback.is_null())
 637     deletion_callbacks_.push_back(std::make_pair(callback, databases));
 638   for (DatabaseSet::const_iterator ori = databases.begin();
 639        ori != databases.end(); ++ori) {
 640     for (std::set<base::string16>::const_iterator db = ori->second.begin();
 641          db != ori->second.end(); ++db)
 642       ScheduleDatabaseForDeletion(ori->first, *db);
 643   }
 644 }
 645
 646 int DatabaseTracker::DeleteDatabase(const std::string& origin_identifier,
 647                                     const base::string16& database_name,
 648                                     const net::CompletionCallback& callback) {
 649   if (!LazyInit())
 650     return net::ERR_FAILED;
 651
 652   if (database_connections_.IsDatabaseOpened(origin_identifier,
 653                                              database_name)) {
 654     if (!callback.is_null()) {
 655       DatabaseSet set;
 656       set[origin_identifier].insert(database_name);
 657       deletion_callbacks_.push_back(std::make_pair(callback, set));
 658     }
 659     ScheduleDatabaseForDeletion(origin_identifier, database_name);
 660     return net::ERR_IO_PENDING;
 661   }
 662   DeleteClosedDatabase(origin_identifier, database_name);
 663   return net::OK;
 664 }
 665
 666 int DatabaseTracker::DeleteDataModifiedSince(
 667     const base::Time& cutoff,
 668     const net::CompletionCallback& callback) {
 669   if (!LazyInit())
 670     return net::ERR_FAILED;
 671
 672   DatabaseSet to_be_deleted;
 673
 674   std::vector<std::string> origins_identifiers;
 675   if (!databases_table_->GetAllOriginIdentifiers(&origins_identifiers))
 676     return net::ERR_FAILED;
 677   int rv = net::OK;
 678   for (std::vector<std::string>::const_iterator ori =
 679            origins_identifiers.begin();
 680        ori != origins_identifiers.end(); ++ori) {
 681     if (special_storage_policy_.get() &&
 682         special_storage_policy_->IsStorageProtected(
 683             webkit_database::GetOriginFromIdentifier(*ori))) {
 684       continue;
 685     }
 686
 687     std::vector<DatabaseDetails> details;
 688     if (!databases_table_->
 689             GetAllDatabaseDetailsForOriginIdentifier(*ori, &details))
 690       rv = net::ERR_FAILED;
 691     for (std::vector<DatabaseDetails>::const_iterator db = details.begin();
 692          db != details.end(); ++db) {
 693       base::FilePath db_file = GetFullDBFilePath(*ori, db->database_name);
 694       base::File::Info file_info;
 695       base::GetFileInfo(db_file, &file_info);
 696       if (file_info.last_modified < cutoff)
 697         continue;
 698
 699       // Check if the database is opened by any renderer.
 700       if (database_connections_.IsDatabaseOpened(*ori, db->database_name))
 701         to_be_deleted[*ori].insert(db->database_name);
 702       else
 703         DeleteClosedDatabase(*ori, db->database_name);
 704     }
 705   }
 706
 707   if (rv != net::OK)
 708     return rv;
 709
 710   if (!to_be_deleted.empty()) {
 711     ScheduleDatabasesForDeletion(to_be_deleted, callback);
 712     return net::ERR_IO_PENDING;
 713   }
 714   return net::OK;
 715 }
 716
 717 int DatabaseTracker::DeleteDataForOrigin(
 718     const std::string& origin, const net::CompletionCallback& callback) {
 719   if (!LazyInit())
 720     return net::ERR_FAILED;
 721
 722   DatabaseSet to_be_deleted;
 723
 724   std::vector<DatabaseDetails> details;
 725   if (!databases_table_->
 726           GetAllDatabaseDetailsForOriginIdentifier(origin, &details))
 727     return net::ERR_FAILED;
 728   for (std::vector<DatabaseDetails>::const_iterator db = details.begin();
 729        db != details.end(); ++db) {
 730     // Check if the database is opened by any renderer.
 731     if (database_connections_.IsDatabaseOpened(origin, db->database_name))
 732       to_be_deleted[origin].insert(db->database_name);
 733     else
 734       DeleteClosedDatabase(origin, db->database_name);
 735   }
 736
 737   if (!to_be_deleted.empty()) {
 738     ScheduleDatabasesForDeletion(to_be_deleted, callback);
 739     return net::ERR_IO_PENDING;
 740   }
 741   return net::OK;
 742 }
 743
 744 const base::File* DatabaseTracker::GetIncognitoFile(
 745     const base::string16& vfs_file_name) const {
 746   DCHECK(is_incognito_);
 747   FileHandlesMap::const_iterator it =
 748       incognito_file_handles_.find(vfs_file_name);
 749   if (it != incognito_file_handles_.end())
 750     return it->second;
 751
 752   return NULL;
 753 }
 754
 755 const base::File* DatabaseTracker::SaveIncognitoFile(
 756     const base::string16& vfs_file_name,
 757     base::File file) {
 758   DCHECK(is_incognito_);
 759   if (!file.IsValid())
 760     return NULL;
 761
 762   base::File* to_insert = new base::File(file.Pass());
 763   std::pair<FileHandlesMap::iterator, bool> rv =
 764       incognito_file_handles_.insert(std::make_pair(vfs_file_name, to_insert));
 765   DCHECK(rv.second);
 766   return rv.first->second;
 767 }
 768
 769 void DatabaseTracker::CloseIncognitoFileHandle(
 770     const base::string16& vfs_file_name) {
 771   DCHECK(is_incognito_);
 772   DCHECK(incognito_file_handles_.find(vfs_file_name) !=
 773          incognito_file_handles_.end());
 774
 775   FileHandlesMap::iterator it = incognito_file_handles_.find(vfs_file_name);
 776   if (it != incognito_file_handles_.end()) {
 777     delete it->second;
 778     incognito_file_handles_.erase(it);
 779   }
 780 }
 781
 782 bool DatabaseTracker::HasSavedIncognitoFileHandle(
 783     const base::string16& vfs_file_name) const {
 784   return (incognito_file_handles_.find(vfs_file_name) !=
 785           incognito_file_handles_.end());
 786 }
 787
 788 void DatabaseTracker::DeleteIncognitoDBDirectory() {
 789   is_initialized_ = false;
 790
 791   for (FileHandlesMap::iterator it = incognito_file_handles_.begin();
 792        it != incognito_file_handles_.end(); it++) {
 793     delete it->second;
 794   }
 795
 796   base::FilePath incognito_db_dir =
 797       profile_path_.Append(kIncognitoDatabaseDirectoryName);
 798   if (base::DirectoryExists(incognito_db_dir))
 799     base::DeleteFile(incognito_db_dir, true);
 800 }
 801
 802 void DatabaseTracker::ClearSessionOnlyOrigins() {
 803   bool has_session_only_databases =
 804       special_storage_policy_.get() &&
 805       special_storage_policy_->HasSessionOnlyOrigins();
 806
 807   // Clearing only session-only databases, and there are none.
 808   if (!has_session_only_databases)
 809     return;
 810
 811   if (!LazyInit())
 812     return;
 813
 814   std::vector<std::string> origin_identifiers;
 815   GetAllOriginIdentifiers(&origin_identifiers);
 816
 817   for (std::vector<std::string>::iterator origin =
 818            origin_identifiers.begin();
 819        origin != origin_identifiers.end(); ++origin) {
 820     GURL origin_url = webkit_database::GetOriginFromIdentifier(*origin);
 821     if (!special_storage_policy_->IsStorageSessionOnly(origin_url))
 822       continue;
 823     if (special_storage_policy_->IsStorageProtected(origin_url))
 824       continue;
 825     webkit_database::OriginInfo origin_info;
 826     std::vector<base::string16> databases;
 827     GetOriginInfo(*origin, &origin_info);
 828     origin_info.GetAllDatabaseNames(&databases);
 829
 830     for (std::vector<base::string16>::iterator database = databases.begin();
 831          database != databases.end(); ++database) {
 832       base::File file(GetFullDBFilePath(*origin, *database),
 833                       base::File::FLAG_OPEN_ALWAYS |
 834                           base::File::FLAG_SHARE_DELETE |
 835                           base::File::FLAG_DELETE_ON_CLOSE |
 836                           base::File::FLAG_READ);
 837     }
 838     DeleteOrigin(*origin, true);
 839   }
 840 }
 841
 842
 843 void DatabaseTracker::Shutdown() {
 844   DCHECK(db_tracker_thread_.get());
 845   DCHECK(db_tracker_thread_->BelongsToCurrentThread());
 846   if (shutting_down_) {
 847     NOTREACHED();
 848     return;
 849   }
 850   shutting_down_ = true;
 851   if (is_incognito_)
 852     DeleteIncognitoDBDirectory();
 853   else if (!force_keep_session_state_)
 854     ClearSessionOnlyOrigins();
 855   CloseTrackerDatabaseAndClearCaches();
 856 }
 857
 858 void DatabaseTracker::SetForceKeepSessionState() {
 859   DCHECK(db_tracker_thread_.get());
 860   if (!db_tracker_thread_->BelongsToCurrentThread()) {
 861     db_tracker_thread_->PostTask(
 862         FROM_HERE,
 863         base::Bind(&DatabaseTracker::SetForceKeepSessionState, this));
 864     return;
 865   }
 866   force_keep_session_state_ = true;
 867 }
 868
 869 }  // namespace webkit_database