chrome/browser/sync_file_system/local/local_file_sync_context.cc

   1 // Copyright 2013 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 "chrome/browser/sync_file_system/local/local_file_sync_context.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_util.h"
   9 #include "base/location.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "base/stl_util.h"
  12 #include "base/task_runner_util.h"
  13 #include "chrome/browser/sync_file_system/file_change.h"
  14 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
  15 #include "chrome/browser/sync_file_system/local/local_origin_change_observer.h"
  16 #include "chrome/browser/sync_file_system/local/root_delete_helper.h"
  17 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
  18 #include "chrome/browser/sync_file_system/local/syncable_file_operation_runner.h"
  19 #include "chrome/browser/sync_file_system/logger.h"
  20 #include "chrome/browser/sync_file_system/sync_file_metadata.h"
  21 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
  22 #include "storage/browser/blob/scoped_file.h"
  23 #include "storage/browser/fileapi/file_system_context.h"
  24 #include "storage/browser/fileapi/file_system_file_util.h"
  25 #include "storage/browser/fileapi/file_system_operation_context.h"
  26 #include "storage/browser/fileapi/file_system_operation_runner.h"
  27 #include "storage/common/fileapi/file_system_util.h"
  28
  29 using storage::FileSystemContext;
  30 using storage::FileSystemFileUtil;
  31 using storage::FileSystemOperation;
  32 using storage::FileSystemOperationContext;
  33 using storage::FileSystemURL;
  34
  35 namespace sync_file_system {
  36
  37 namespace {
  38
  39 const int kMaxConcurrentSyncableOperation = 3;
  40 const int kNotifyChangesDurationInSec = 1;
  41 const int kMaxURLsToFetchForLocalSync = 5;
  42
  43 const base::FilePath::CharType kSnapshotDir[] = FILE_PATH_LITERAL("snapshots");
  44
  45 }  // namespace
  46
  47 LocalFileSyncContext::LocalFileSyncContext(
  48     const base::FilePath& base_path,
  49     leveldb::Env* env_override,
  50     base::SingleThreadTaskRunner* ui_task_runner,
  51     base::SingleThreadTaskRunner* io_task_runner)
  52     : local_base_path_(base_path.Append(FILE_PATH_LITERAL("local"))),
  53       env_override_(env_override),
  54       ui_task_runner_(ui_task_runner),
  55       io_task_runner_(io_task_runner),
  56       shutdown_on_ui_(false),
  57       shutdown_on_io_(false),
  58       mock_notify_changes_duration_in_sec_(-1) {
  59   DCHECK(base_path.IsAbsolute());
  60   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
  61 }
  62
  63 void LocalFileSyncContext::MaybeInitializeFileSystemContext(
  64     const GURL& source_url,
  65     FileSystemContext* file_system_context,
  66     const SyncStatusCallback& callback) {
  67   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
  68   if (ContainsKey(file_system_contexts_, file_system_context)) {
  69     // The context has been already initialized. Just dispatch the callback
  70     // with SYNC_STATUS_OK.
  71     ui_task_runner_->PostTask(FROM_HERE, base::Bind(callback, SYNC_STATUS_OK));
  72     return;
  73   }
  74
  75   StatusCallbackQueue& callback_queue =
  76       pending_initialize_callbacks_[file_system_context];
  77   callback_queue.push_back(callback);
  78   if (callback_queue.size() > 1)
  79     return;
  80
  81   // The sync service always expects the origin (app) is initialized
  82   // for writable way (even when MaybeInitializeFileSystemContext is called
  83   // from read-only OpenFileSystem), so open the filesystem with
  84   // CREATE_IF_NONEXISTENT here.
  85   storage::FileSystemBackend::OpenFileSystemCallback open_filesystem_callback =
  86       base::Bind(&LocalFileSyncContext::InitializeFileSystemContextOnIOThread,
  87                  this,
  88                  source_url,
  89                  make_scoped_refptr(file_system_context));
  90   io_task_runner_->PostTask(
  91       FROM_HERE,
  92       base::Bind(&storage::SandboxFileSystemBackendDelegate::OpenFileSystem,
  93                  base::Unretained(file_system_context->sandbox_delegate()),
  94                  source_url,
  95                  storage::kFileSystemTypeSyncable,
  96                  storage::OPEN_FILE_SYSTEM_CREATE_IF_NONEXISTENT,
  97                  open_filesystem_callback,
  98                  GURL()));
  99 }
 100
 101 void LocalFileSyncContext::ShutdownOnUIThread() {
 102   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 103   shutdown_on_ui_ = true;
 104   io_task_runner_->PostTask(
 105       FROM_HERE,
 106       base::Bind(&LocalFileSyncContext::ShutdownOnIOThread, this));
 107 }
 108
 109 void LocalFileSyncContext::GetFileForLocalSync(
 110     FileSystemContext* file_system_context,
 111     const LocalFileSyncInfoCallback& callback) {
 112   DCHECK(file_system_context);
 113   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 114
 115   base::PostTaskAndReplyWithResult(
 116       file_system_context->default_file_task_runner(),
 117       FROM_HERE,
 118       base::Bind(&LocalFileSyncContext::GetNextURLsForSyncOnFileThread,
 119                  this, make_scoped_refptr(file_system_context)),
 120       base::Bind(&LocalFileSyncContext::TryPrepareForLocalSync,
 121                  this, make_scoped_refptr(file_system_context), callback));
 122 }
 123
 124 void LocalFileSyncContext::ClearChangesForURL(
 125     FileSystemContext* file_system_context,
 126     const FileSystemURL& url,
 127     const base::Closure& done_callback) {
 128   // This is initially called on UI thread and to be relayed to FILE thread.
 129   DCHECK(file_system_context);
 130   if (!file_system_context->default_file_task_runner()->
 131           RunsTasksOnCurrentThread()) {
 132     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 133     file_system_context->default_file_task_runner()->PostTask(
 134         FROM_HERE,
 135         base::Bind(&LocalFileSyncContext::ClearChangesForURL,
 136                    this, make_scoped_refptr(file_system_context),
 137                    url, done_callback));
 138     return;
 139   }
 140
 141   SyncFileSystemBackend* backend =
 142       SyncFileSystemBackend::GetBackend(file_system_context);
 143   DCHECK(backend);
 144   DCHECK(backend->change_tracker());
 145   backend->change_tracker()->ClearChangesForURL(url);
 146
 147   // Call the completion callback on UI thread.
 148   ui_task_runner_->PostTask(FROM_HERE, done_callback);
 149 }
 150
 151 void LocalFileSyncContext::FinalizeSnapshotSync(
 152     storage::FileSystemContext* file_system_context,
 153     const storage::FileSystemURL& url,
 154     SyncStatusCode sync_finish_status,
 155     const base::Closure& done_callback) {
 156   DCHECK(file_system_context);
 157   DCHECK(url.is_valid());
 158   if (!file_system_context->default_file_task_runner()->
 159           RunsTasksOnCurrentThread()) {
 160     file_system_context->default_file_task_runner()->PostTask(
 161         FROM_HERE,
 162         base::Bind(&LocalFileSyncContext::FinalizeSnapshotSync,
 163                    this, make_scoped_refptr(file_system_context),
 164                    url, sync_finish_status, done_callback));
 165     return;
 166   }
 167
 168   SyncFileSystemBackend* backend =
 169       SyncFileSystemBackend::GetBackend(file_system_context);
 170   DCHECK(backend);
 171   DCHECK(backend->change_tracker());
 172
 173   if (sync_finish_status == SYNC_STATUS_OK ||
 174       sync_finish_status == SYNC_STATUS_HAS_CONFLICT) {
 175     // Commit the in-memory mirror change.
 176     backend->change_tracker()->ResetToMirrorAndCommitChangesForURL(url);
 177   } else {
 178     // Abort in-memory mirror change.
 179     backend->change_tracker()->RemoveMirrorAndCommitChangesForURL(url);
 180   }
 181
 182   // We've been keeping it in writing mode, so clear the writing counter
 183   // to unblock sync activities.
 184   io_task_runner_->PostTask(
 185       FROM_HERE, base::Bind(
 186           &LocalFileSyncContext::FinalizeSnapshotSyncOnIOThread, this, url));
 187
 188   // Call the completion callback on UI thread.
 189   ui_task_runner_->PostTask(FROM_HERE, done_callback);
 190 }
 191
 192 void LocalFileSyncContext::FinalizeExclusiveSync(
 193     storage::FileSystemContext* file_system_context,
 194     const storage::FileSystemURL& url,
 195     bool clear_local_changes,
 196     const base::Closure& done_callback) {
 197   DCHECK(file_system_context);
 198   if (!url.is_valid()) {
 199     done_callback.Run();
 200     return;
 201   }
 202
 203   if (clear_local_changes) {
 204     ClearChangesForURL(file_system_context, url,
 205                        base::Bind(&LocalFileSyncContext::FinalizeExclusiveSync,
 206                                   this, make_scoped_refptr(file_system_context),
 207                                   url, false, done_callback));
 208     return;
 209   }
 210
 211   io_task_runner_->PostTask(
 212       FROM_HERE,
 213       base::Bind(&LocalFileSyncContext::ClearSyncFlagOnIOThread,
 214                  this, url, false /* for_snapshot_sync */));
 215
 216   done_callback.Run();
 217 }
 218
 219 void LocalFileSyncContext::PrepareForSync(
 220     FileSystemContext* file_system_context,
 221     const FileSystemURL& url,
 222     SyncMode sync_mode,
 223     const LocalFileSyncInfoCallback& callback) {
 224   // This is initially called on UI thread and to be relayed to IO thread.
 225   if (!io_task_runner_->RunsTasksOnCurrentThread()) {
 226     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 227     io_task_runner_->PostTask(
 228         FROM_HERE,
 229         base::Bind(&LocalFileSyncContext::PrepareForSync, this,
 230                    make_scoped_refptr(file_system_context), url,
 231                    sync_mode, callback));
 232     return;
 233   }
 234   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 235   const bool syncable = sync_status()->IsSyncable(url);
 236   // Disable writing if it's ready to be synced.
 237   if (syncable)
 238     sync_status()->StartSyncing(url);
 239   ui_task_runner_->PostTask(
 240       FROM_HERE,
 241       base::Bind(&LocalFileSyncContext::DidGetWritingStatusForSync,
 242                  this, make_scoped_refptr(file_system_context),
 243                  syncable ? SYNC_STATUS_OK :
 244                             SYNC_STATUS_FILE_BUSY,
 245                  url, sync_mode, callback));
 246 }
 247
 248 void LocalFileSyncContext::RegisterURLForWaitingSync(
 249     const FileSystemURL& url,
 250     const base::Closure& on_syncable_callback) {
 251   // This is initially called on UI thread and to be relayed to IO thread.
 252   if (!io_task_runner_->RunsTasksOnCurrentThread()) {
 253     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 254     io_task_runner_->PostTask(
 255         FROM_HERE,
 256         base::Bind(&LocalFileSyncContext::RegisterURLForWaitingSync,
 257                    this, url, on_syncable_callback));
 258     return;
 259   }
 260   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 261   if (shutdown_on_io_)
 262     return;
 263   if (sync_status()->IsSyncable(url)) {
 264     // No need to register; fire the callback now.
 265     ui_task_runner_->PostTask(FROM_HERE, on_syncable_callback);
 266     return;
 267   }
 268   url_waiting_sync_on_io_ = url;
 269   url_syncable_callback_ = on_syncable_callback;
 270 }
 271
 272 void LocalFileSyncContext::ApplyRemoteChange(
 273     FileSystemContext* file_system_context,
 274     const FileChange& change,
 275     const base::FilePath& local_path,
 276     const FileSystemURL& url,
 277     const SyncStatusCallback& callback) {
 278   if (!io_task_runner_->RunsTasksOnCurrentThread()) {
 279     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 280     io_task_runner_->PostTask(
 281         FROM_HERE,
 282         base::Bind(&LocalFileSyncContext::ApplyRemoteChange, this,
 283                    make_scoped_refptr(file_system_context),
 284                    change, local_path, url, callback));
 285     return;
 286   }
 287   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 288   DCHECK(!sync_status()->IsWritable(url));
 289   DCHECK(!sync_status()->IsWriting(url));
 290
 291   FileSystemOperation::StatusCallback operation_callback;
 292   switch (change.change()) {
 293     case FileChange::FILE_CHANGE_DELETE:
 294       HandleRemoteDelete(file_system_context, url, callback);
 295       return;
 296     case FileChange::FILE_CHANGE_ADD_OR_UPDATE:
 297       HandleRemoteAddOrUpdate(
 298           file_system_context, change, local_path, url, callback);
 299       return;
 300   }
 301   NOTREACHED();
 302   callback.Run(SYNC_STATUS_FAILED);
 303 }
 304
 305 void LocalFileSyncContext::HandleRemoteDelete(
 306     FileSystemContext* file_system_context,
 307     const FileSystemURL& url,
 308     const SyncStatusCallback& callback) {
 309   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
 310       file_system_context, url);
 311
 312   // Handle root directory case differently.
 313   if (storage::VirtualPath::IsRootPath(url.path())) {
 314     DCHECK(!root_delete_helper_);
 315     root_delete_helper_.reset(new RootDeleteHelper(
 316         file_system_context, sync_status(), url,
 317         base::Bind(&LocalFileSyncContext::DidApplyRemoteChange,
 318                    this, url, callback)));
 319     root_delete_helper_->Run();
 320     return;
 321   }
 322
 323   file_system_context->operation_runner()->Remove(
 324       url_for_sync, true /* recursive */,
 325       base::Bind(&LocalFileSyncContext::DidApplyRemoteChange,
 326                  this, url, callback));
 327 }
 328
 329 void LocalFileSyncContext::HandleRemoteAddOrUpdate(
 330     FileSystemContext* file_system_context,
 331     const FileChange& change,
 332     const base::FilePath& local_path,
 333     const FileSystemURL& url,
 334     const SyncStatusCallback& callback) {
 335   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
 336       file_system_context, url);
 337
 338   if (storage::VirtualPath::IsRootPath(url.path())) {
 339     DidApplyRemoteChange(url, callback, base::File::FILE_OK);
 340     return;
 341   }
 342
 343   file_system_context->operation_runner()->Remove(
 344       url_for_sync, true /* recursive */,
 345       base::Bind(
 346           &LocalFileSyncContext::DidRemoveExistingEntryForRemoteAddOrUpdate,
 347           this,
 348           make_scoped_refptr(file_system_context),
 349           change,
 350           local_path,
 351           url,
 352           callback));
 353 }
 354
 355 void LocalFileSyncContext::DidRemoveExistingEntryForRemoteAddOrUpdate(
 356     FileSystemContext* file_system_context,
 357     const FileChange& change,
 358     const base::FilePath& local_path,
 359     const FileSystemURL& url,
 360     const SyncStatusCallback& callback,
 361     base::File::Error error) {
 362   // Remove() may fail if the target entry does not exist (which is ok),
 363   // so we ignore |error| here.
 364
 365   if (shutdown_on_io_) {
 366     callback.Run(SYNC_FILE_ERROR_ABORT);
 367     return;
 368   }
 369
 370   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 371   DCHECK(!sync_status()->IsWritable(url));
 372   DCHECK(!sync_status()->IsWriting(url));
 373
 374   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
 375       file_system_context, url);
 376   FileSystemOperation::StatusCallback operation_callback = base::Bind(
 377       &LocalFileSyncContext::DidApplyRemoteChange, this, url, callback);
 378
 379   DCHECK_EQ(FileChange::FILE_CHANGE_ADD_OR_UPDATE, change.change());
 380   switch (change.file_type()) {
 381     case SYNC_FILE_TYPE_FILE: {
 382       DCHECK(!local_path.empty());
 383       base::FilePath dir_path = storage::VirtualPath::DirName(url.path());
 384       if (dir_path.empty() ||
 385           storage::VirtualPath::DirName(dir_path) == dir_path) {
 386         // Copying into the root directory.
 387         file_system_context->operation_runner()->CopyInForeignFile(
 388             local_path, url_for_sync, operation_callback);
 389       } else {
 390         FileSystemURL dir_url = file_system_context->CreateCrackedFileSystemURL(
 391             url_for_sync.origin(),
 392             url_for_sync.mount_type(),
 393             storage::VirtualPath::DirName(url_for_sync.virtual_path()));
 394         file_system_context->operation_runner()->CreateDirectory(
 395             dir_url,
 396             false /* exclusive */,
 397             true /* recursive */,
 398             base::Bind(&LocalFileSyncContext::DidCreateDirectoryForCopyIn,
 399                        this,
 400                        make_scoped_refptr(file_system_context),
 401                        local_path,
 402                        url,
 403                        operation_callback));
 404       }
 405       break;
 406     }
 407     case SYNC_FILE_TYPE_DIRECTORY:
 408       file_system_context->operation_runner()->CreateDirectory(
 409           url_for_sync, false /* exclusive */, true /* recursive */,
 410           operation_callback);
 411       break;
 412     case SYNC_FILE_TYPE_UNKNOWN:
 413       NOTREACHED() << "File type unknown for ADD_OR_UPDATE change";
 414   }
 415 }
 416
 417 void LocalFileSyncContext::RecordFakeLocalChange(
 418     FileSystemContext* file_system_context,
 419     const FileSystemURL& url,
 420     const FileChange& change,
 421     const SyncStatusCallback& callback) {
 422   // This is called on UI thread and to be relayed to FILE thread.
 423   DCHECK(file_system_context);
 424   if (!file_system_context->default_file_task_runner()->
 425           RunsTasksOnCurrentThread()) {
 426     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 427     file_system_context->default_file_task_runner()->PostTask(
 428         FROM_HERE,
 429         base::Bind(&LocalFileSyncContext::RecordFakeLocalChange,
 430                    this, make_scoped_refptr(file_system_context),
 431                    url, change, callback));
 432     return;
 433   }
 434
 435   SyncFileSystemBackend* backend =
 436       SyncFileSystemBackend::GetBackend(file_system_context);
 437   DCHECK(backend);
 438   DCHECK(backend->change_tracker());
 439   backend->change_tracker()->MarkDirtyOnDatabase(url);
 440   backend->change_tracker()->RecordChange(url, change);
 441
 442   // Fire the callback on UI thread.
 443   ui_task_runner_->PostTask(FROM_HERE,
 444                             base::Bind(callback,
 445                                        SYNC_STATUS_OK));
 446 }
 447
 448 void LocalFileSyncContext::GetFileMetadata(
 449     FileSystemContext* file_system_context,
 450     const FileSystemURL& url,
 451     const SyncFileMetadataCallback& callback) {
 452   // This is initially called on UI thread and to be relayed to IO thread.
 453   if (!io_task_runner_->RunsTasksOnCurrentThread()) {
 454     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 455     io_task_runner_->PostTask(
 456         FROM_HERE,
 457         base::Bind(&LocalFileSyncContext::GetFileMetadata, this,
 458                    make_scoped_refptr(file_system_context), url, callback));
 459     return;
 460   }
 461   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 462
 463   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
 464       file_system_context, url);
 465   file_system_context->operation_runner()->GetMetadata(
 466       url_for_sync, base::Bind(&LocalFileSyncContext::DidGetFileMetadata,
 467                       this, callback));
 468 }
 469
 470 void LocalFileSyncContext::HasPendingLocalChanges(
 471     FileSystemContext* file_system_context,
 472     const FileSystemURL& url,
 473     const HasPendingLocalChangeCallback& callback) {
 474   // This gets called on UI thread and relays the task on FILE thread.
 475   DCHECK(file_system_context);
 476   if (!file_system_context->default_file_task_runner()->
 477           RunsTasksOnCurrentThread()) {
 478     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 479     file_system_context->default_file_task_runner()->PostTask(
 480         FROM_HERE,
 481         base::Bind(&LocalFileSyncContext::HasPendingLocalChanges,
 482                    this, make_scoped_refptr(file_system_context),
 483                    url, callback));
 484     return;
 485   }
 486
 487   SyncFileSystemBackend* backend =
 488       SyncFileSystemBackend::GetBackend(file_system_context);
 489   DCHECK(backend);
 490   DCHECK(backend->change_tracker());
 491   FileChangeList changes;
 492   backend->change_tracker()->GetChangesForURL(url, &changes);
 493
 494   // Fire the callback on UI thread.
 495   ui_task_runner_->PostTask(FROM_HERE,
 496                             base::Bind(callback,
 497                                        SYNC_STATUS_OK,
 498                                        !changes.empty()));
 499 }
 500
 501 void LocalFileSyncContext::PromoteDemotedChanges(
 502     const GURL& origin,
 503     storage::FileSystemContext* file_system_context,
 504     const base::Closure& callback) {
 505   // This is initially called on UI thread and to be relayed to FILE thread.
 506   DCHECK(file_system_context);
 507   if (!file_system_context->default_file_task_runner()->
 508           RunsTasksOnCurrentThread()) {
 509     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 510     file_system_context->default_file_task_runner()->PostTask(
 511         FROM_HERE,
 512         base::Bind(&LocalFileSyncContext::PromoteDemotedChanges,
 513                    this, origin, make_scoped_refptr(file_system_context),
 514                    callback));
 515     return;
 516   }
 517
 518   SyncFileSystemBackend* backend =
 519       SyncFileSystemBackend::GetBackend(file_system_context);
 520   DCHECK(backend);
 521   DCHECK(backend->change_tracker());
 522   if (!backend->change_tracker()->PromoteDemotedChanges()) {
 523     ui_task_runner_->PostTask(FROM_HERE, callback);
 524     return;
 525   }
 526
 527   io_task_runner_->PostTask(
 528       FROM_HERE,
 529       base::Bind(&LocalFileSyncContext::UpdateChangesForOrigin,
 530                  this, origin, callback));
 531 }
 532
 533 void LocalFileSyncContext::UpdateChangesForOrigin(
 534     const GURL& origin,
 535     const base::Closure& callback) {
 536   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 537   if (shutdown_on_io_)
 538     return;
 539   origins_with_pending_changes_.insert(origin);
 540   ScheduleNotifyChangesUpdatedOnIOThread(callback);
 541 }
 542
 543 void LocalFileSyncContext::AddOriginChangeObserver(
 544     LocalOriginChangeObserver* observer) {
 545   origin_change_observers_.AddObserver(observer);
 546 }
 547
 548 void LocalFileSyncContext::RemoveOriginChangeObserver(
 549     LocalOriginChangeObserver* observer) {
 550   origin_change_observers_.RemoveObserver(observer);
 551 }
 552
 553 base::WeakPtr<SyncableFileOperationRunner>
 554 LocalFileSyncContext::operation_runner() const {
 555   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 556   if (operation_runner_)
 557     return operation_runner_->AsWeakPtr();
 558   return base::WeakPtr<SyncableFileOperationRunner>();
 559 }
 560
 561 LocalFileSyncStatus* LocalFileSyncContext::sync_status() const {
 562   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 563   return sync_status_.get();
 564 }
 565
 566 void LocalFileSyncContext::OnSyncEnabled(const FileSystemURL& url) {
 567   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 568   if (shutdown_on_io_)
 569     return;
 570   UpdateChangesForOrigin(url.origin(), NoopClosure());
 571   if (url_syncable_callback_.is_null() ||
 572       sync_status()->IsWriting(url_waiting_sync_on_io_)) {
 573     return;
 574   }
 575   // TODO(kinuko): may want to check how many pending tasks we have.
 576   ui_task_runner_->PostTask(FROM_HERE, url_syncable_callback_);
 577   url_syncable_callback_.Reset();
 578 }
 579
 580 void LocalFileSyncContext::OnWriteEnabled(const FileSystemURL& url) {
 581   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 582   // Nothing to do for now.
 583 }
 584
 585 LocalFileSyncContext::~LocalFileSyncContext() {
 586 }
 587
 588 void LocalFileSyncContext::ScheduleNotifyChangesUpdatedOnIOThread(
 589     const base::Closure& callback) {
 590   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 591   if (shutdown_on_io_)
 592     return;
 593   pending_completion_callbacks_.push_back(callback);
 594   if (base::Time::Now() > last_notified_changes_ + NotifyChangesDuration()) {
 595     NotifyAvailableChangesOnIOThread();
 596   } else if (!timer_on_io_->IsRunning()) {
 597     timer_on_io_->Start(
 598         FROM_HERE, NotifyChangesDuration(),
 599         base::Bind(&LocalFileSyncContext::NotifyAvailableChangesOnIOThread,
 600                    base::Unretained(this)));
 601   }
 602 }
 603
 604 void LocalFileSyncContext::NotifyAvailableChangesOnIOThread() {
 605   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 606   if (shutdown_on_io_)
 607     return;
 608
 609   std::vector<base::Closure> completion_callbacks;
 610   completion_callbacks.swap(pending_completion_callbacks_);
 611
 612   ui_task_runner_->PostTask(
 613       FROM_HERE,
 614       base::Bind(&LocalFileSyncContext::NotifyAvailableChanges,
 615                  this, origins_with_pending_changes_,
 616                  completion_callbacks));
 617   last_notified_changes_ = base::Time::Now();
 618   origins_with_pending_changes_.clear();
 619 }
 620
 621 void LocalFileSyncContext::NotifyAvailableChanges(
 622     const std::set<GURL>& origins,
 623     const std::vector<base::Closure>& callbacks) {
 624   FOR_EACH_OBSERVER(LocalOriginChangeObserver, origin_change_observers_,
 625                     OnChangesAvailableInOrigins(origins));
 626   for (const auto& callback : callbacks)
 627     callback.Run();
 628 }
 629
 630 void LocalFileSyncContext::ShutdownOnIOThread() {
 631   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 632   shutdown_on_io_ = true;
 633   operation_runner_.reset();
 634   root_delete_helper_.reset();
 635   sync_status_.reset();
 636   timer_on_io_.reset();
 637 }
 638
 639 void LocalFileSyncContext::InitializeFileSystemContextOnIOThread(
 640     const GURL& source_url,
 641     FileSystemContext* file_system_context,
 642     const GURL& /* root */,
 643     const std::string& /* name */,
 644     base::File::Error error) {
 645   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 646   if (shutdown_on_io_)
 647     error = base::File::FILE_ERROR_ABORT;
 648   if (error != base::File::FILE_OK) {
 649     DidInitialize(source_url, file_system_context,
 650                   FileErrorToSyncStatusCode(error));
 651     return;
 652   }
 653   DCHECK(file_system_context);
 654   SyncFileSystemBackend* backend =
 655       SyncFileSystemBackend::GetBackend(file_system_context);
 656   DCHECK(backend);
 657   if (!backend->change_tracker()) {
 658     // Create and initialize LocalFileChangeTracker and call back this method
 659     // later again.
 660     std::set<GURL>* origins_with_changes = new std::set<GURL>;
 661     scoped_ptr<LocalFileChangeTracker>* tracker_ptr(
 662         new scoped_ptr<LocalFileChangeTracker>);
 663     base::PostTaskAndReplyWithResult(
 664         file_system_context->default_file_task_runner(),
 665         FROM_HERE,
 666         base::Bind(&LocalFileSyncContext::InitializeChangeTrackerOnFileThread,
 667                    this, tracker_ptr,
 668                    make_scoped_refptr(file_system_context),
 669                    origins_with_changes),
 670         base::Bind(&LocalFileSyncContext::DidInitializeChangeTrackerOnIOThread,
 671                    this, base::Owned(tracker_ptr),
 672                    source_url,
 673                    make_scoped_refptr(file_system_context),
 674                    base::Owned(origins_with_changes)));
 675     return;
 676   }
 677   if (!operation_runner_) {
 678     DCHECK(!sync_status_);
 679     DCHECK(!timer_on_io_);
 680     sync_status_.reset(new LocalFileSyncStatus);
 681     timer_on_io_.reset(new base::OneShotTimer<LocalFileSyncContext>);
 682     operation_runner_.reset(new SyncableFileOperationRunner(
 683             kMaxConcurrentSyncableOperation,
 684             sync_status_.get()));
 685     sync_status_->AddObserver(this);
 686   }
 687   backend->set_sync_context(this);
 688   DidInitialize(source_url, file_system_context,
 689                 SYNC_STATUS_OK);
 690 }
 691
 692 SyncStatusCode LocalFileSyncContext::InitializeChangeTrackerOnFileThread(
 693     scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
 694     FileSystemContext* file_system_context,
 695     std::set<GURL>* origins_with_changes) {
 696   DCHECK(file_system_context);
 697   DCHECK(tracker_ptr);
 698   DCHECK(origins_with_changes);
 699   tracker_ptr->reset(new LocalFileChangeTracker(
 700           file_system_context->partition_path(),
 701           env_override_,
 702           file_system_context->default_file_task_runner()));
 703   const SyncStatusCode status = (*tracker_ptr)->Initialize(file_system_context);
 704   if (status != SYNC_STATUS_OK)
 705     return status;
 706
 707   // Get all origins that have pending changes.
 708   FileSystemURLQueue urls;
 709   (*tracker_ptr)->GetNextChangedURLs(&urls, 0);
 710   for (FileSystemURLQueue::iterator iter = urls.begin();
 711        iter != urls.end(); ++iter) {
 712     origins_with_changes->insert(iter->origin());
 713   }
 714
 715   // Creates snapshot directory.
 716   base::CreateDirectory(local_base_path_.Append(kSnapshotDir));
 717
 718   return status;
 719 }
 720
 721 void LocalFileSyncContext::DidInitializeChangeTrackerOnIOThread(
 722     scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
 723     const GURL& source_url,
 724     FileSystemContext* file_system_context,
 725     std::set<GURL>* origins_with_changes,
 726     SyncStatusCode status) {
 727   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 728   DCHECK(file_system_context);
 729   DCHECK(origins_with_changes);
 730   if (shutdown_on_io_)
 731     status = SYNC_STATUS_ABORT;
 732   if (status != SYNC_STATUS_OK) {
 733     DidInitialize(source_url, file_system_context, status);
 734     return;
 735   }
 736
 737   SyncFileSystemBackend* backend =
 738       SyncFileSystemBackend::GetBackend(file_system_context);
 739   DCHECK(backend);
 740   backend->SetLocalFileChangeTracker(tracker_ptr->Pass());
 741
 742   origins_with_pending_changes_.insert(origins_with_changes->begin(),
 743                                        origins_with_changes->end());
 744   ScheduleNotifyChangesUpdatedOnIOThread(NoopClosure());
 745
 746   InitializeFileSystemContextOnIOThread(source_url, file_system_context,
 747                                         GURL(), std::string(),
 748                                         base::File::FILE_OK);
 749 }
 750
 751 void LocalFileSyncContext::DidInitialize(
 752     const GURL& source_url,
 753     FileSystemContext* file_system_context,
 754     SyncStatusCode status) {
 755   if (!ui_task_runner_->RunsTasksOnCurrentThread()) {
 756     ui_task_runner_->PostTask(
 757         FROM_HERE,
 758         base::Bind(&LocalFileSyncContext::DidInitialize,
 759                    this, source_url,
 760                    make_scoped_refptr(file_system_context), status));
 761     return;
 762   }
 763   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 764   DCHECK(!ContainsKey(file_system_contexts_, file_system_context));
 765   DCHECK(ContainsKey(pending_initialize_callbacks_, file_system_context));
 766
 767   SyncFileSystemBackend* backend =
 768       SyncFileSystemBackend::GetBackend(file_system_context);
 769   DCHECK(backend);
 770   DCHECK(backend->change_tracker());
 771
 772   file_system_contexts_.insert(file_system_context);
 773
 774   StatusCallbackQueue& callback_queue =
 775       pending_initialize_callbacks_[file_system_context];
 776   for (StatusCallbackQueue::iterator iter = callback_queue.begin();
 777        iter != callback_queue.end(); ++iter) {
 778     ui_task_runner_->PostTask(FROM_HERE, base::Bind(*iter, status));
 779   }
 780   pending_initialize_callbacks_.erase(file_system_context);
 781 }
 782
 783 scoped_ptr<LocalFileSyncContext::FileSystemURLQueue>
 784 LocalFileSyncContext::GetNextURLsForSyncOnFileThread(
 785     FileSystemContext* file_system_context) {
 786   DCHECK(file_system_context);
 787   DCHECK(file_system_context->default_file_task_runner()->
 788              RunsTasksOnCurrentThread());
 789   SyncFileSystemBackend* backend =
 790       SyncFileSystemBackend::GetBackend(file_system_context);
 791   DCHECK(backend);
 792   DCHECK(backend->change_tracker());
 793   scoped_ptr<FileSystemURLQueue> urls(new FileSystemURLQueue);
 794   backend->change_tracker()->GetNextChangedURLs(
 795       urls.get(), kMaxURLsToFetchForLocalSync);
 796   for (FileSystemURLQueue::iterator iter = urls->begin();
 797        iter != urls->end(); ++iter)
 798     backend->change_tracker()->DemoteChangesForURL(*iter);
 799
 800   return urls.Pass();
 801 }
 802
 803 void LocalFileSyncContext::TryPrepareForLocalSync(
 804     FileSystemContext* file_system_context,
 805     const LocalFileSyncInfoCallback& callback,
 806     scoped_ptr<FileSystemURLQueue> urls) {
 807   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 808   DCHECK(urls);
 809
 810   if (shutdown_on_ui_) {
 811     callback.Run(SYNC_STATUS_ABORT, LocalFileSyncInfo(), storage::ScopedFile());
 812     return;
 813   }
 814
 815   if (urls->empty()) {
 816     callback.Run(SYNC_STATUS_NO_CHANGE_TO_SYNC,
 817                  LocalFileSyncInfo(),
 818                  storage::ScopedFile());
 819     return;
 820   }
 821
 822   const FileSystemURL url = urls->front();
 823   urls->pop_front();
 824
 825   PrepareForSync(
 826       file_system_context, url, SYNC_SNAPSHOT,
 827       base::Bind(&LocalFileSyncContext::DidTryPrepareForLocalSync,
 828                  this, make_scoped_refptr(file_system_context),
 829                  base::Passed(&urls), callback));
 830 }
 831
 832 void LocalFileSyncContext::DidTryPrepareForLocalSync(
 833     FileSystemContext* file_system_context,
 834     scoped_ptr<FileSystemURLQueue> remaining_urls,
 835     const LocalFileSyncInfoCallback& callback,
 836     SyncStatusCode status,
 837     const LocalFileSyncInfo& sync_file_info,
 838     storage::ScopedFile snapshot) {
 839   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 840   if (status != SYNC_STATUS_FILE_BUSY) {
 841     PromoteDemotedChangesForURLs(file_system_context,
 842                                  remaining_urls.Pass());
 843     callback.Run(status, sync_file_info, snapshot.Pass());
 844     return;
 845   }
 846
 847   PromoteDemotedChangesForURL(file_system_context, sync_file_info.url);
 848
 849   // Recursively call TryPrepareForLocalSync with remaining_urls.
 850   TryPrepareForLocalSync(file_system_context, callback, remaining_urls.Pass());
 851 }
 852
 853 void LocalFileSyncContext::PromoteDemotedChangesForURL(
 854     FileSystemContext* file_system_context,
 855     const FileSystemURL& url) {
 856   DCHECK(file_system_context);
 857   if (!file_system_context->default_file_task_runner()->
 858           RunsTasksOnCurrentThread()) {
 859     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 860     if (shutdown_on_ui_)
 861       return;
 862     file_system_context->default_file_task_runner()->PostTask(
 863         FROM_HERE,
 864         base::Bind(&LocalFileSyncContext::PromoteDemotedChangesForURL,
 865                    this, make_scoped_refptr(file_system_context), url));
 866     return;
 867   }
 868
 869   SyncFileSystemBackend* backend =
 870       SyncFileSystemBackend::GetBackend(file_system_context);
 871   DCHECK(backend);
 872   DCHECK(backend->change_tracker());
 873   backend->change_tracker()->PromoteDemotedChangesForURL(url);
 874 }
 875
 876 void LocalFileSyncContext::PromoteDemotedChangesForURLs(
 877     FileSystemContext* file_system_context,
 878     scoped_ptr<FileSystemURLQueue> urls) {
 879   DCHECK(file_system_context);
 880   if (!file_system_context->default_file_task_runner()->
 881           RunsTasksOnCurrentThread()) {
 882     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 883     if (shutdown_on_ui_)
 884       return;
 885     file_system_context->default_file_task_runner()->PostTask(
 886         FROM_HERE,
 887         base::Bind(&LocalFileSyncContext::PromoteDemotedChangesForURLs,
 888                    this, make_scoped_refptr(file_system_context),
 889                    base::Passed(&urls)));
 890     return;
 891   }
 892
 893   for (FileSystemURLQueue::iterator iter = urls->begin();
 894        iter != urls->end(); ++iter)
 895     PromoteDemotedChangesForURL(file_system_context, *iter);
 896 }
 897
 898 void LocalFileSyncContext::DidGetWritingStatusForSync(
 899     FileSystemContext* file_system_context,
 900     SyncStatusCode status,
 901     const FileSystemURL& url,
 902     SyncMode sync_mode,
 903     const LocalFileSyncInfoCallback& callback) {
 904   // This gets called on UI thread and relays the task on FILE thread.
 905   DCHECK(file_system_context);
 906   if (!file_system_context->default_file_task_runner()->
 907           RunsTasksOnCurrentThread()) {
 908     DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 909     if (shutdown_on_ui_) {
 910       callback.Run(
 911           SYNC_STATUS_ABORT, LocalFileSyncInfo(), storage::ScopedFile());
 912       return;
 913     }
 914     file_system_context->default_file_task_runner()->PostTask(
 915         FROM_HERE,
 916         base::Bind(&LocalFileSyncContext::DidGetWritingStatusForSync,
 917                    this, make_scoped_refptr(file_system_context),
 918                    status, url, sync_mode, callback));
 919     return;
 920   }
 921
 922   SyncFileSystemBackend* backend =
 923       SyncFileSystemBackend::GetBackend(file_system_context);
 924   DCHECK(backend);
 925   DCHECK(backend->change_tracker());
 926   FileChangeList changes;
 927   backend->change_tracker()->GetChangesForURL(url, &changes);
 928
 929   base::FilePath platform_path;
 930   base::File::Info file_info;
 931   FileSystemFileUtil* file_util =
 932       file_system_context->sandbox_delegate()->sync_file_util();
 933   DCHECK(file_util);
 934
 935   base::File::Error file_error = file_util->GetFileInfo(
 936       make_scoped_ptr(
 937           new FileSystemOperationContext(file_system_context)).get(),
 938       url,
 939       &file_info,
 940       &platform_path);
 941
 942   storage::ScopedFile snapshot;
 943   if (file_error == base::File::FILE_OK && sync_mode == SYNC_SNAPSHOT) {
 944     base::FilePath snapshot_path;
 945     base::CreateTemporaryFileInDir(local_base_path_.Append(kSnapshotDir),
 946                                    &snapshot_path);
 947     if (base::CopyFile(platform_path, snapshot_path)) {
 948       platform_path = snapshot_path;
 949       snapshot =
 950           storage::ScopedFile(snapshot_path,
 951                               storage::ScopedFile::DELETE_ON_SCOPE_OUT,
 952                               file_system_context->default_file_task_runner());
 953     }
 954   }
 955
 956   if (status == SYNC_STATUS_OK &&
 957       file_error != base::File::FILE_OK &&
 958       file_error != base::File::FILE_ERROR_NOT_FOUND) {
 959     status = FileErrorToSyncStatusCode(file_error);
 960 }
 961
 962   DCHECK(!file_info.is_symbolic_link);
 963
 964   SyncFileType file_type = SYNC_FILE_TYPE_FILE;
 965   if (file_error == base::File::FILE_ERROR_NOT_FOUND)
 966     file_type = SYNC_FILE_TYPE_UNKNOWN;
 967   else if (file_info.is_directory)
 968     file_type = SYNC_FILE_TYPE_DIRECTORY;
 969
 970   LocalFileSyncInfo sync_file_info;
 971   sync_file_info.url = url;
 972   sync_file_info.local_file_path = platform_path;
 973   sync_file_info.metadata.file_type = file_type;
 974   sync_file_info.metadata.size = file_info.size;
 975   sync_file_info.metadata.last_modified = file_info.last_modified;
 976   sync_file_info.changes = changes;
 977
 978   if (status == SYNC_STATUS_OK && sync_mode == SYNC_SNAPSHOT) {
 979     if (!changes.empty()) {
 980       // Now we create an empty mirror change record for URL (and we record
 981       // changes to both mirror and original records during sync), so that
 982       // we can reset to the mirror when the sync succeeds.
 983       backend->change_tracker()->CreateFreshMirrorForURL(url);
 984     }
 985
 986     // 'Unlock' the file for snapshot sync.
 987     // (But keep it in writing status so that no other sync starts on
 988     // the same URL)
 989     io_task_runner_->PostTask(
 990         FROM_HERE,
 991         base::Bind(&LocalFileSyncContext::ClearSyncFlagOnIOThread,
 992                    this, url, true /* for_snapshot_sync */));
 993   }
 994
 995   ui_task_runner_->PostTask(FROM_HERE,
 996                             base::Bind(callback, status, sync_file_info,
 997                                        base::Passed(&snapshot)));
 998 }
 999
1000 void LocalFileSyncContext::ClearSyncFlagOnIOThread(
1001     const FileSystemURL& url,
1002     bool for_snapshot_sync) {
1003   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
1004   if (shutdown_on_io_)
1005     return;
1006   sync_status()->EndSyncing(url);
1007
1008   if (for_snapshot_sync) {
1009     // The caller will hold shared lock on this one.
1010     sync_status()->StartWriting(url);
1011     return;
1012   }
1013
1014   // Since a sync has finished the number of changes must have been updated.
1015   UpdateChangesForOrigin(url.origin(), NoopClosure());
1016 }
1017
1018 void LocalFileSyncContext::FinalizeSnapshotSyncOnIOThread(
1019     const FileSystemURL& url) {
1020   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
1021   if (shutdown_on_io_)
1022     return;
1023   sync_status()->EndWriting(url);
1024
1025   // Since a sync has finished the number of changes must have been updated.
1026   UpdateChangesForOrigin(url.origin(), NoopClosure());
1027 }
1028
1029 void LocalFileSyncContext::DidApplyRemoteChange(
1030     const FileSystemURL& url,
1031     const SyncStatusCallback& callback_on_ui,
1032     base::File::Error file_error) {
1033   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
1034   root_delete_helper_.reset();
1035   ui_task_runner_->PostTask(
1036       FROM_HERE,
1037       base::Bind(callback_on_ui, FileErrorToSyncStatusCode(file_error)));
1038 }
1039
1040 void LocalFileSyncContext::DidGetFileMetadata(
1041     const SyncFileMetadataCallback& callback,
1042     base::File::Error file_error,
1043     const base::File::Info& file_info) {
1044   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
1045   SyncFileMetadata metadata;
1046   if (file_error == base::File::FILE_OK) {
1047     metadata.file_type = file_info.is_directory ?
1048         SYNC_FILE_TYPE_DIRECTORY : SYNC_FILE_TYPE_FILE;
1049     metadata.size = file_info.size;
1050     metadata.last_modified = file_info.last_modified;
1051   }
1052   ui_task_runner_->PostTask(
1053       FROM_HERE,
1054       base::Bind(callback, FileErrorToSyncStatusCode(file_error), metadata));
1055 }
1056
1057 base::TimeDelta LocalFileSyncContext::NotifyChangesDuration() {
1058   if (mock_notify_changes_duration_in_sec_ >= 0)
1059     return base::TimeDelta::FromSeconds(mock_notify_changes_duration_in_sec_);
1060   return base::TimeDelta::FromSeconds(kNotifyChangesDurationInSec);
1061 }
1062
1063 void LocalFileSyncContext::DidCreateDirectoryForCopyIn(
1064     FileSystemContext* file_system_context,
1065     const base::FilePath& local_path,
1066     const FileSystemURL& dest_url,
1067     const StatusCallback& callback,
1068     base::File::Error error) {
1069   if (error != base::File::FILE_OK) {
1070     callback.Run(error);
1071     return;
1072   }
1073
1074   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
1075       file_system_context, dest_url);
1076   file_system_context->operation_runner()->CopyInForeignFile(
1077       local_path, url_for_sync, callback);
1078 }
1079
1080 }  // namespace sync_file_system