storage/browser/fileapi/copy_or_move_operation_delegate.cc

   1 // Copyright (c) 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 "storage/browser/fileapi/copy_or_move_operation_delegate.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_path.h"
   9 #include "net/base/io_buffer.h"
  10 #include "net/base/net_errors.h"
  11 #include "storage/browser/blob/shareable_file_reference.h"
  12 #include "storage/browser/fileapi/copy_or_move_file_validator.h"
  13 #include "storage/browser/fileapi/file_observers.h"
  14 #include "storage/browser/fileapi/file_stream_reader.h"
  15 #include "storage/browser/fileapi/file_stream_writer.h"
  16 #include "storage/browser/fileapi/file_system_context.h"
  17 #include "storage/browser/fileapi/file_system_operation_runner.h"
  18 #include "storage/browser/fileapi/file_system_url.h"
  19 #include "storage/common/fileapi/file_system_util.h"
  20
  21 namespace storage {
  22
  23 const int64 kFlushIntervalInBytes = 10 << 20;  // 10MB.
  24
  25 class CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  26  public:
  27   virtual ~CopyOrMoveImpl() {}
  28   virtual void Run(
  29       const CopyOrMoveOperationDelegate::StatusCallback& callback) = 0;
  30   virtual void Cancel() = 0;
  31
  32  protected:
  33   CopyOrMoveImpl() {}
  34
  35  private:
  36   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveImpl);
  37 };
  38
  39 namespace {
  40
  41 // Copies a file on a (same) file system. Just delegate the operation to
  42 // |operation_runner|.
  43 class CopyOrMoveOnSameFileSystemImpl
  44     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  45  public:
  46   CopyOrMoveOnSameFileSystemImpl(
  47       FileSystemOperationRunner* operation_runner,
  48       CopyOrMoveOperationDelegate::OperationType operation_type,
  49       const FileSystemURL& src_url,
  50       const FileSystemURL& dest_url,
  51       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
  52       const FileSystemOperation::CopyFileProgressCallback&
  53           file_progress_callback)
  54       : operation_runner_(operation_runner),
  55         operation_type_(operation_type),
  56         src_url_(src_url),
  57         dest_url_(dest_url),
  58         option_(option),
  59         file_progress_callback_(file_progress_callback) {
  60   }
  61
  62   void Run(
  63       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
  64     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_MOVE) {
  65       operation_runner_->MoveFileLocal(src_url_, dest_url_, option_, callback);
  66     } else {
  67       operation_runner_->CopyFileLocal(
  68           src_url_, dest_url_, option_, file_progress_callback_, callback);
  69     }
  70   }
  71
  72   void Cancel() override {
  73     // We can do nothing for the copy/move operation on a local file system.
  74     // Assuming the operation is quickly done, it should be ok to just wait
  75     // for the completion.
  76   }
  77
  78  private:
  79   FileSystemOperationRunner* operation_runner_;
  80   CopyOrMoveOperationDelegate::OperationType operation_type_;
  81   FileSystemURL src_url_;
  82   FileSystemURL dest_url_;
  83   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
  84   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
  85   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveOnSameFileSystemImpl);
  86 };
  87
  88 // Specifically for cross file system copy/move operation, this class creates
  89 // a snapshot file, validates it if necessary, runs copying process,
  90 // validates the created file, and removes source file for move (noop for
  91 // copy).
  92 class SnapshotCopyOrMoveImpl
  93     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  94  public:
  95   SnapshotCopyOrMoveImpl(
  96       FileSystemOperationRunner* operation_runner,
  97       CopyOrMoveOperationDelegate::OperationType operation_type,
  98       const FileSystemURL& src_url,
  99       const FileSystemURL& dest_url,
 100       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
 101       CopyOrMoveFileValidatorFactory* validator_factory,
 102       const FileSystemOperation::CopyFileProgressCallback&
 103           file_progress_callback)
 104       : operation_runner_(operation_runner),
 105         operation_type_(operation_type),
 106         src_url_(src_url),
 107         dest_url_(dest_url),
 108         option_(option),
 109         validator_factory_(validator_factory),
 110         file_progress_callback_(file_progress_callback),
 111         cancel_requested_(false),
 112         weak_factory_(this) {
 113   }
 114
 115   void Run(
 116       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
 117     file_progress_callback_.Run(0);
 118     operation_runner_->CreateSnapshotFile(
 119         src_url_,
 120         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterCreateSnapshot,
 121                    weak_factory_.GetWeakPtr(), callback));
 122   }
 123
 124   void Cancel() override { cancel_requested_ = true; }
 125
 126  private:
 127   void RunAfterCreateSnapshot(
 128       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 129       base::File::Error error,
 130       const base::File::Info& file_info,
 131       const base::FilePath& platform_path,
 132       const scoped_refptr<storage::ShareableFileReference>& file_ref) {
 133     if (cancel_requested_)
 134       error = base::File::FILE_ERROR_ABORT;
 135
 136     if (error != base::File::FILE_OK) {
 137       callback.Run(error);
 138       return;
 139     }
 140
 141     // For now we assume CreateSnapshotFile always return a valid local file
 142     // path.
 143     DCHECK(!platform_path.empty());
 144
 145     if (!validator_factory_) {
 146       // No validation is needed.
 147       RunAfterPreWriteValidation(platform_path, file_info, file_ref, callback,
 148                                  base::File::FILE_OK);
 149       return;
 150     }
 151
 152     // Run pre write validation.
 153     PreWriteValidation(
 154         platform_path,
 155         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterPreWriteValidation,
 156                    weak_factory_.GetWeakPtr(),
 157                    platform_path, file_info, file_ref, callback));
 158   }
 159
 160   void RunAfterPreWriteValidation(
 161       const base::FilePath& platform_path,
 162       const base::File::Info& file_info,
 163       const scoped_refptr<storage::ShareableFileReference>& file_ref,
 164       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 165       base::File::Error error) {
 166     if (cancel_requested_)
 167       error = base::File::FILE_ERROR_ABORT;
 168
 169     if (error != base::File::FILE_OK) {
 170       callback.Run(error);
 171       return;
 172     }
 173
 174     // |file_ref| is unused but necessary to keep the file alive until
 175     // CopyInForeignFile() is completed.
 176     operation_runner_->CopyInForeignFile(
 177         platform_path, dest_url_,
 178         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterCopyInForeignFile,
 179                    weak_factory_.GetWeakPtr(), file_info, file_ref, callback));
 180   }
 181
 182   void RunAfterCopyInForeignFile(
 183       const base::File::Info& file_info,
 184       const scoped_refptr<storage::ShareableFileReference>& file_ref,
 185       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 186       base::File::Error error) {
 187     if (cancel_requested_)
 188       error = base::File::FILE_ERROR_ABORT;
 189
 190     if (error != base::File::FILE_OK) {
 191       callback.Run(error);
 192       return;
 193     }
 194
 195     file_progress_callback_.Run(file_info.size);
 196
 197     if (option_ == FileSystemOperation::OPTION_NONE) {
 198       RunAfterTouchFile(callback, base::File::FILE_OK);
 199       return;
 200     }
 201
 202     operation_runner_->TouchFile(
 203         dest_url_, base::Time::Now() /* last_access */,
 204         file_info.last_modified,
 205         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterTouchFile,
 206                    weak_factory_.GetWeakPtr(), callback));
 207   }
 208
 209   void RunAfterTouchFile(
 210       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 211       base::File::Error error) {
 212     // Even if TouchFile is failed, just ignore it.
 213
 214     if (cancel_requested_) {
 215       callback.Run(base::File::FILE_ERROR_ABORT);
 216       return;
 217     }
 218
 219     // |validator_| is NULL when the destination filesystem does not do
 220     // validation.
 221     if (!validator_) {
 222       // No validation is needed.
 223       RunAfterPostWriteValidation(callback, base::File::FILE_OK);
 224       return;
 225     }
 226
 227     PostWriteValidation(
 228         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterPostWriteValidation,
 229                    weak_factory_.GetWeakPtr(), callback));
 230   }
 231
 232   void RunAfterPostWriteValidation(
 233       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 234       base::File::Error error) {
 235     if (cancel_requested_) {
 236       callback.Run(base::File::FILE_ERROR_ABORT);
 237       return;
 238     }
 239
 240     if (error != base::File::FILE_OK) {
 241       // Failed to validate. Remove the destination file.
 242       operation_runner_->Remove(
 243           dest_url_, true /* recursive */,
 244           base::Bind(&SnapshotCopyOrMoveImpl::DidRemoveDestForError,
 245                      weak_factory_.GetWeakPtr(), error, callback));
 246       return;
 247     }
 248
 249     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_COPY) {
 250       callback.Run(base::File::FILE_OK);
 251       return;
 252     }
 253
 254     DCHECK_EQ(CopyOrMoveOperationDelegate::OPERATION_MOVE, operation_type_);
 255
 256     // Remove the source for finalizing move operation.
 257     operation_runner_->Remove(
 258         src_url_, true /* recursive */,
 259         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterRemoveSourceForMove,
 260                    weak_factory_.GetWeakPtr(), callback));
 261   }
 262
 263   void RunAfterRemoveSourceForMove(
 264       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 265       base::File::Error error) {
 266     if (cancel_requested_)
 267       error = base::File::FILE_ERROR_ABORT;
 268
 269     if (error == base::File::FILE_ERROR_NOT_FOUND)
 270       error = base::File::FILE_OK;
 271     callback.Run(error);
 272   }
 273
 274   void DidRemoveDestForError(
 275       base::File::Error prior_error,
 276       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 277       base::File::Error error) {
 278     if (error != base::File::FILE_OK) {
 279       VLOG(1) << "Error removing destination file after validation error: "
 280               << error;
 281     }
 282     callback.Run(prior_error);
 283   }
 284
 285   // Runs pre-write validation.
 286   void PreWriteValidation(
 287       const base::FilePath& platform_path,
 288       const CopyOrMoveOperationDelegate::StatusCallback& callback) {
 289     DCHECK(validator_factory_);
 290     validator_.reset(
 291         validator_factory_->CreateCopyOrMoveFileValidator(
 292             src_url_, platform_path));
 293     validator_->StartPreWriteValidation(callback);
 294   }
 295
 296   // Runs post-write validation.
 297   void PostWriteValidation(
 298       const CopyOrMoveOperationDelegate::StatusCallback& callback) {
 299     operation_runner_->CreateSnapshotFile(
 300         dest_url_,
 301         base::Bind(
 302             &SnapshotCopyOrMoveImpl::PostWriteValidationAfterCreateSnapshotFile,
 303             weak_factory_.GetWeakPtr(), callback));
 304   }
 305
 306   void PostWriteValidationAfterCreateSnapshotFile(
 307       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 308       base::File::Error error,
 309       const base::File::Info& file_info,
 310       const base::FilePath& platform_path,
 311       const scoped_refptr<storage::ShareableFileReference>& file_ref) {
 312     if (cancel_requested_)
 313       error = base::File::FILE_ERROR_ABORT;
 314
 315     if (error != base::File::FILE_OK) {
 316       callback.Run(error);
 317       return;
 318     }
 319
 320     DCHECK(validator_);
 321     // Note: file_ref passed here to keep the file alive until after
 322     // the StartPostWriteValidation operation finishes.
 323     validator_->StartPostWriteValidation(
 324         platform_path,
 325         base::Bind(&SnapshotCopyOrMoveImpl::DidPostWriteValidation,
 326                    weak_factory_.GetWeakPtr(), file_ref, callback));
 327   }
 328
 329   // |file_ref| is unused; it is passed here to make sure the reference is
 330   // alive until after post-write validation is complete.
 331   void DidPostWriteValidation(
 332       const scoped_refptr<storage::ShareableFileReference>& file_ref,
 333       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 334       base::File::Error error) {
 335     callback.Run(error);
 336   }
 337
 338   FileSystemOperationRunner* operation_runner_;
 339   CopyOrMoveOperationDelegate::OperationType operation_type_;
 340   FileSystemURL src_url_;
 341   FileSystemURL dest_url_;
 342
 343   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
 344   CopyOrMoveFileValidatorFactory* validator_factory_;
 345   scoped_ptr<CopyOrMoveFileValidator> validator_;
 346   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
 347   bool cancel_requested_;
 348   base::WeakPtrFactory<SnapshotCopyOrMoveImpl> weak_factory_;
 349   DISALLOW_COPY_AND_ASSIGN(SnapshotCopyOrMoveImpl);
 350 };
 351
 352 // The size of buffer for StreamCopyHelper.
 353 const int kReadBufferSize = 32768;
 354
 355 // To avoid too many progress callbacks, it should be called less
 356 // frequently than 50ms.
 357 const int kMinProgressCallbackInvocationSpanInMilliseconds = 50;
 358
 359 // Specifically for cross file system copy/move operation, this class uses
 360 // stream reader and writer for copying. Validator is not supported, so if
 361 // necessary SnapshotCopyOrMoveImpl should be used.
 362 class StreamCopyOrMoveImpl
 363     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
 364  public:
 365   StreamCopyOrMoveImpl(
 366       FileSystemOperationRunner* operation_runner,
 367       FileSystemContext* file_system_context,
 368       CopyOrMoveOperationDelegate::OperationType operation_type,
 369       const FileSystemURL& src_url,
 370       const FileSystemURL& dest_url,
 371       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
 372       scoped_ptr<storage::FileStreamReader> reader,
 373       scoped_ptr<FileStreamWriter> writer,
 374       const FileSystemOperation::CopyFileProgressCallback&
 375           file_progress_callback)
 376       : operation_runner_(operation_runner),
 377         file_system_context_(file_system_context),
 378         operation_type_(operation_type),
 379         src_url_(src_url),
 380         dest_url_(dest_url),
 381         option_(option),
 382         reader_(reader.Pass()),
 383         writer_(writer.Pass()),
 384         file_progress_callback_(file_progress_callback),
 385         cancel_requested_(false),
 386         weak_factory_(this) {}
 387
 388   void Run(
 389       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
 390     // Reader can be created even if the entry does not exist or the entry is
 391     // a directory. To check errors before destination file creation,
 392     // check metadata first.
 393     operation_runner_->GetMetadata(
 394         src_url_,
 395         base::Bind(&StreamCopyOrMoveImpl::RunAfterGetMetadataForSource,
 396                    weak_factory_.GetWeakPtr(), callback));
 397   }
 398
 399   void Cancel() override {
 400     cancel_requested_ = true;
 401     if (copy_helper_)
 402       copy_helper_->Cancel();
 403   }
 404
 405  private:
 406   void NotifyOnStartUpdate(const FileSystemURL& url) {
 407     if (file_system_context_->GetUpdateObservers(url.type())) {
 408       file_system_context_->GetUpdateObservers(url.type())
 409           ->Notify(&FileUpdateObserver::OnStartUpdate, base::MakeTuple(url));
 410     }
 411   }
 412
 413   void NotifyOnModifyFile(const FileSystemURL& url) {
 414     if (file_system_context_->GetChangeObservers(url.type())) {
 415       file_system_context_->GetChangeObservers(url.type())
 416           ->Notify(&FileChangeObserver::OnModifyFile, base::MakeTuple(url));
 417     }
 418   }
 419
 420   void NotifyOnEndUpdate(const FileSystemURL& url) {
 421     if (file_system_context_->GetUpdateObservers(url.type())) {
 422       file_system_context_->GetUpdateObservers(url.type())
 423           ->Notify(&FileUpdateObserver::OnEndUpdate, base::MakeTuple(url));
 424     }
 425   }
 426
 427   void RunAfterGetMetadataForSource(
 428       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 429       base::File::Error error,
 430       const base::File::Info& file_info) {
 431     if (cancel_requested_)
 432       error = base::File::FILE_ERROR_ABORT;
 433
 434     if (error != base::File::FILE_OK) {
 435       callback.Run(error);
 436       return;
 437     }
 438
 439     if (file_info.is_directory) {
 440       // If not a directory, failed with appropriate error code.
 441       callback.Run(base::File::FILE_ERROR_NOT_A_FILE);
 442       return;
 443     }
 444
 445     // To use FileStreamWriter, we need to ensure the destination file exists.
 446     operation_runner_->CreateFile(
 447         dest_url_,
 448         true /* exclusive */,
 449         base::Bind(&StreamCopyOrMoveImpl::RunAfterCreateFileForDestination,
 450                    weak_factory_.GetWeakPtr(),
 451                    callback,
 452                    file_info.last_modified));
 453   }
 454
 455   void RunAfterCreateFileForDestination(
 456       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 457       const base::Time& last_modified,
 458       base::File::Error error) {
 459     if (cancel_requested_)
 460       error = base::File::FILE_ERROR_ABORT;
 461     // This conversion is to return the consistent status code with
 462     // FileSystemFileUtil::Copy.
 463     if (error == base::File::FILE_ERROR_NOT_A_FILE)
 464       error = base::File::FILE_ERROR_INVALID_OPERATION;
 465
 466     if (error != base::File::FILE_OK &&
 467         error != base::File::FILE_ERROR_EXISTS) {
 468       callback.Run(error);
 469       return;
 470     }
 471
 472     if (error == base::File::FILE_ERROR_EXISTS) {
 473       operation_runner_->Truncate(
 474           dest_url_,
 475           0 /* length */,
 476           base::Bind(&StreamCopyOrMoveImpl::RunAfterTruncateForDestination,
 477                      weak_factory_.GetWeakPtr(),
 478                      callback,
 479                      last_modified));
 480       return;
 481     }
 482     RunAfterTruncateForDestination(
 483         callback, last_modified, base::File::FILE_OK);
 484   }
 485
 486   void RunAfterTruncateForDestination(
 487       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 488       const base::Time& last_modified,
 489       base::File::Error error) {
 490     if (cancel_requested_)
 491       error = base::File::FILE_ERROR_ABORT;
 492
 493     if (error != base::File::FILE_OK) {
 494       callback.Run(error);
 495       return;
 496     }
 497
 498     NotifyOnStartUpdate(dest_url_);
 499     DCHECK(!copy_helper_);
 500     copy_helper_.reset(new CopyOrMoveOperationDelegate::StreamCopyHelper(
 501         reader_.Pass(), writer_.Pass(), dest_url_.mount_option().flush_policy(),
 502         kReadBufferSize, file_progress_callback_,
 503         base::TimeDelta::FromMilliseconds(
 504             kMinProgressCallbackInvocationSpanInMilliseconds)));
 505     copy_helper_->Run(
 506         base::Bind(&StreamCopyOrMoveImpl::RunAfterStreamCopy,
 507                    weak_factory_.GetWeakPtr(), callback, last_modified));
 508   }
 509
 510   void RunAfterStreamCopy(
 511       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 512       const base::Time& last_modified,
 513       base::File::Error error) {
 514     NotifyOnModifyFile(dest_url_);
 515     NotifyOnEndUpdate(dest_url_);
 516     if (cancel_requested_)
 517       error = base::File::FILE_ERROR_ABORT;
 518
 519     if (error != base::File::FILE_OK) {
 520       callback.Run(error);
 521       return;
 522     }
 523
 524     if (option_ == FileSystemOperation::OPTION_NONE) {
 525       RunAfterTouchFile(callback, base::File::FILE_OK);
 526       return;
 527     }
 528
 529     operation_runner_->TouchFile(
 530         dest_url_, base::Time::Now() /* last_access */, last_modified,
 531         base::Bind(&StreamCopyOrMoveImpl::RunAfterTouchFile,
 532                    weak_factory_.GetWeakPtr(), callback));
 533   }
 534
 535   void RunAfterTouchFile(
 536       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 537       base::File::Error error) {
 538     // Even if TouchFile is failed, just ignore it.
 539     if (cancel_requested_) {
 540       callback.Run(base::File::FILE_ERROR_ABORT);
 541       return;
 542     }
 543
 544     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_COPY) {
 545       callback.Run(base::File::FILE_OK);
 546       return;
 547     }
 548
 549     DCHECK_EQ(CopyOrMoveOperationDelegate::OPERATION_MOVE, operation_type_);
 550
 551     // Remove the source for finalizing move operation.
 552     operation_runner_->Remove(
 553         src_url_, false /* recursive */,
 554         base::Bind(&StreamCopyOrMoveImpl::RunAfterRemoveForMove,
 555                    weak_factory_.GetWeakPtr(), callback));
 556   }
 557
 558   void RunAfterRemoveForMove(
 559       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 560       base::File::Error error) {
 561     if (cancel_requested_)
 562       error = base::File::FILE_ERROR_ABORT;
 563     if (error == base::File::FILE_ERROR_NOT_FOUND)
 564       error = base::File::FILE_OK;
 565     callback.Run(error);
 566   }
 567
 568   FileSystemOperationRunner* operation_runner_;
 569   scoped_refptr<FileSystemContext> file_system_context_;
 570   CopyOrMoveOperationDelegate::OperationType operation_type_;
 571   FileSystemURL src_url_;
 572   FileSystemURL dest_url_;
 573   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
 574   scoped_ptr<storage::FileStreamReader> reader_;
 575   scoped_ptr<FileStreamWriter> writer_;
 576   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
 577   scoped_ptr<CopyOrMoveOperationDelegate::StreamCopyHelper> copy_helper_;
 578   bool cancel_requested_;
 579   base::WeakPtrFactory<StreamCopyOrMoveImpl> weak_factory_;
 580   DISALLOW_COPY_AND_ASSIGN(StreamCopyOrMoveImpl);
 581 };
 582
 583 }  // namespace
 584
 585 CopyOrMoveOperationDelegate::StreamCopyHelper::StreamCopyHelper(
 586     scoped_ptr<storage::FileStreamReader> reader,
 587     scoped_ptr<FileStreamWriter> writer,
 588     storage::FlushPolicy flush_policy,
 589     int buffer_size,
 590     const FileSystemOperation::CopyFileProgressCallback& file_progress_callback,
 591     const base::TimeDelta& min_progress_callback_invocation_span)
 592     : reader_(reader.Pass()),
 593       writer_(writer.Pass()),
 594       flush_policy_(flush_policy),
 595       file_progress_callback_(file_progress_callback),
 596       io_buffer_(new net::IOBufferWithSize(buffer_size)),
 597       num_copied_bytes_(0),
 598       previous_flush_offset_(0),
 599       min_progress_callback_invocation_span_(
 600           min_progress_callback_invocation_span),
 601       cancel_requested_(false),
 602       weak_factory_(this) {
 603 }
 604
 605 CopyOrMoveOperationDelegate::StreamCopyHelper::~StreamCopyHelper() {
 606 }
 607
 608 void CopyOrMoveOperationDelegate::StreamCopyHelper::Run(
 609     const StatusCallback& callback) {
 610   file_progress_callback_.Run(0);
 611   last_progress_callback_invocation_time_ = base::Time::Now();
 612   Read(callback);
 613 }
 614
 615 void CopyOrMoveOperationDelegate::StreamCopyHelper::Cancel() {
 616   cancel_requested_ = true;
 617 }
 618
 619 void CopyOrMoveOperationDelegate::StreamCopyHelper::Read(
 620     const StatusCallback& callback) {
 621   int result = reader_->Read(
 622       io_buffer_.get(), io_buffer_->size(),
 623       base::Bind(&StreamCopyHelper::DidRead,
 624                  weak_factory_.GetWeakPtr(), callback));
 625   if (result != net::ERR_IO_PENDING)
 626     DidRead(callback, result);
 627 }
 628
 629 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidRead(
 630     const StatusCallback& callback, int result) {
 631   if (cancel_requested_) {
 632     callback.Run(base::File::FILE_ERROR_ABORT);
 633     return;
 634   }
 635
 636   if (result < 0) {
 637     callback.Run(NetErrorToFileError(result));
 638     return;
 639   }
 640
 641   if (result == 0) {
 642     // Here is the EOF.
 643     if (flush_policy_ == storage::FlushPolicy::FLUSH_ON_COMPLETION)
 644       Flush(callback, true /* is_eof */);
 645     else
 646       callback.Run(base::File::FILE_OK);
 647     return;
 648   }
 649
 650   Write(callback, new net::DrainableIOBuffer(io_buffer_.get(), result));
 651 }
 652
 653 void CopyOrMoveOperationDelegate::StreamCopyHelper::Write(
 654     const StatusCallback& callback,
 655     scoped_refptr<net::DrainableIOBuffer> buffer) {
 656   DCHECK_GT(buffer->BytesRemaining(), 0);
 657
 658   int result = writer_->Write(
 659       buffer.get(), buffer->BytesRemaining(),
 660       base::Bind(&StreamCopyHelper::DidWrite,
 661                  weak_factory_.GetWeakPtr(), callback, buffer));
 662   if (result != net::ERR_IO_PENDING)
 663     DidWrite(callback, buffer, result);
 664 }
 665
 666 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidWrite(
 667     const StatusCallback& callback,
 668     scoped_refptr<net::DrainableIOBuffer> buffer,
 669     int result) {
 670   if (cancel_requested_) {
 671     callback.Run(base::File::FILE_ERROR_ABORT);
 672     return;
 673   }
 674
 675   if (result < 0) {
 676     callback.Run(NetErrorToFileError(result));
 677     return;
 678   }
 679
 680   buffer->DidConsume(result);
 681   num_copied_bytes_ += result;
 682
 683   // Check the elapsed time since last |file_progress_callback_| invocation.
 684   base::Time now = base::Time::Now();
 685   if (now - last_progress_callback_invocation_time_ >=
 686       min_progress_callback_invocation_span_) {
 687     file_progress_callback_.Run(num_copied_bytes_);
 688     last_progress_callback_invocation_time_ = now;
 689   }
 690
 691   if (buffer->BytesRemaining() > 0) {
 692     Write(callback, buffer);
 693     return;
 694   }
 695
 696   if (flush_policy_ == storage::FlushPolicy::FLUSH_ON_COMPLETION &&
 697       (num_copied_bytes_ - previous_flush_offset_) > kFlushIntervalInBytes) {
 698     Flush(callback, false /* not is_eof */);
 699   } else {
 700     Read(callback);
 701   }
 702 }
 703
 704 void CopyOrMoveOperationDelegate::StreamCopyHelper::Flush(
 705     const StatusCallback& callback, bool is_eof) {
 706   int result = writer_->Flush(
 707       base::Bind(&StreamCopyHelper::DidFlush,
 708                  weak_factory_.GetWeakPtr(), callback, is_eof));
 709   if (result != net::ERR_IO_PENDING)
 710     DidFlush(callback, is_eof, result);
 711 }
 712
 713 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidFlush(
 714     const StatusCallback& callback, bool is_eof, int result) {
 715   if (cancel_requested_) {
 716     callback.Run(base::File::FILE_ERROR_ABORT);
 717     return;
 718   }
 719
 720   previous_flush_offset_ = num_copied_bytes_;
 721   if (is_eof)
 722     callback.Run(NetErrorToFileError(result));
 723   else
 724     Read(callback);
 725 }
 726
 727 CopyOrMoveOperationDelegate::CopyOrMoveOperationDelegate(
 728     FileSystemContext* file_system_context,
 729     const FileSystemURL& src_root,
 730     const FileSystemURL& dest_root,
 731     OperationType operation_type,
 732     CopyOrMoveOption option,
 733     const CopyProgressCallback& progress_callback,
 734     const StatusCallback& callback)
 735     : RecursiveOperationDelegate(file_system_context),
 736       src_root_(src_root),
 737       dest_root_(dest_root),
 738       operation_type_(operation_type),
 739       option_(option),
 740       progress_callback_(progress_callback),
 741       callback_(callback),
 742       weak_factory_(this) {
 743   same_file_system_ = src_root_.IsInSameFileSystem(dest_root_);
 744 }
 745
 746 CopyOrMoveOperationDelegate::~CopyOrMoveOperationDelegate() {
 747   STLDeleteElements(&running_copy_set_);
 748 }
 749
 750 void CopyOrMoveOperationDelegate::Run() {
 751   // Not supported; this should never be called.
 752   NOTREACHED();
 753 }
 754
 755 void CopyOrMoveOperationDelegate::RunRecursively() {
 756   // Perform light-weight checks first.
 757
 758   // It is an error to try to copy/move an entry into its child.
 759   if (same_file_system_ && src_root_.path().IsParent(dest_root_.path())) {
 760     callback_.Run(base::File::FILE_ERROR_INVALID_OPERATION);
 761     return;
 762   }
 763
 764   if (same_file_system_ && src_root_.path() == dest_root_.path()) {
 765     // In JS API this should return error, but we return success because Pepper
 766     // wants to return success and we have a code path that returns error in
 767     // Blink for JS (http://crbug.com/329517).
 768     callback_.Run(base::File::FILE_OK);
 769     return;
 770   }
 771
 772   // Start to process the source directory recursively.
 773   // TODO(kinuko): This could be too expensive for same_file_system_==true
 774   // and operation==MOVE case, probably we can just rename the root directory.
 775   // http://crbug.com/172187
 776   StartRecursiveOperation(src_root_, callback_);
 777 }
 778
 779 void CopyOrMoveOperationDelegate::ProcessFile(
 780     const FileSystemURL& src_url,
 781     const StatusCallback& callback) {
 782   if (!progress_callback_.is_null()) {
 783     progress_callback_.Run(
 784         FileSystemOperation::BEGIN_COPY_ENTRY, src_url, FileSystemURL(), 0);
 785   }
 786
 787   FileSystemURL dest_url = CreateDestURL(src_url);
 788   CopyOrMoveImpl* impl = NULL;
 789   if (same_file_system_ &&
 790       (file_system_context()
 791            ->GetFileSystemBackend(src_url.type())
 792            ->HasInplaceCopyImplementation(src_url.type()) ||
 793        operation_type_ == OPERATION_MOVE)) {
 794     impl = new CopyOrMoveOnSameFileSystemImpl(
 795         operation_runner(), operation_type_, src_url, dest_url, option_,
 796         base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 797                    weak_factory_.GetWeakPtr(), src_url));
 798   } else {
 799     // Cross filesystem case.
 800     base::File::Error error = base::File::FILE_ERROR_FAILED;
 801     CopyOrMoveFileValidatorFactory* validator_factory =
 802         file_system_context()->GetCopyOrMoveFileValidatorFactory(
 803             dest_root_.type(), &error);
 804     if (error != base::File::FILE_OK) {
 805       callback.Run(error);
 806       return;
 807     }
 808
 809     if (!validator_factory) {
 810       scoped_ptr<storage::FileStreamReader> reader =
 811           file_system_context()->CreateFileStreamReader(
 812               src_url, 0 /* offset */, storage::kMaximumLength, base::Time());
 813       scoped_ptr<FileStreamWriter> writer =
 814           file_system_context()->CreateFileStreamWriter(dest_url, 0);
 815       if (reader && writer) {
 816         impl = new StreamCopyOrMoveImpl(
 817             operation_runner(),
 818             file_system_context(),
 819             operation_type_,
 820             src_url,
 821             dest_url,
 822             option_,
 823             reader.Pass(),
 824             writer.Pass(),
 825             base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 826                        weak_factory_.GetWeakPtr(),
 827                        src_url));
 828       }
 829     }
 830
 831     if (!impl) {
 832       impl = new SnapshotCopyOrMoveImpl(
 833           operation_runner(), operation_type_, src_url, dest_url, option_,
 834           validator_factory,
 835           base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 836                      weak_factory_.GetWeakPtr(), src_url));
 837     }
 838   }
 839
 840   // Register the running task.
 841   running_copy_set_.insert(impl);
 842   impl->Run(base::Bind(
 843       &CopyOrMoveOperationDelegate::DidCopyOrMoveFile,
 844       weak_factory_.GetWeakPtr(), src_url, dest_url, callback, impl));
 845 }
 846
 847 void CopyOrMoveOperationDelegate::ProcessDirectory(
 848     const FileSystemURL& src_url,
 849     const StatusCallback& callback) {
 850   if (src_url == src_root_) {
 851     // The src_root_ looks to be a directory.
 852     // Try removing the dest_root_ to see if it exists and/or it is an
 853     // empty directory.
 854     // We do not invoke |progress_callback_| for source root, because it is
 855     // already called in ProcessFile().
 856     operation_runner()->RemoveDirectory(
 857         dest_root_,
 858         base::Bind(&CopyOrMoveOperationDelegate::DidTryRemoveDestRoot,
 859                    weak_factory_.GetWeakPtr(), callback));
 860     return;
 861   }
 862
 863   if (!progress_callback_.is_null()) {
 864     progress_callback_.Run(
 865         FileSystemOperation::BEGIN_COPY_ENTRY, src_url, FileSystemURL(), 0);
 866   }
 867
 868   ProcessDirectoryInternal(src_url, CreateDestURL(src_url), callback);
 869 }
 870
 871 void CopyOrMoveOperationDelegate::PostProcessDirectory(
 872     const FileSystemURL& src_url,
 873     const StatusCallback& callback) {
 874   if (option_ == FileSystemOperation::OPTION_NONE) {
 875     PostProcessDirectoryAfterTouchFile(
 876         src_url, callback, base::File::FILE_OK);
 877     return;
 878   }
 879
 880   operation_runner()->GetMetadata(
 881       src_url,
 882       base::Bind(
 883           &CopyOrMoveOperationDelegate::PostProcessDirectoryAfterGetMetadata,
 884           weak_factory_.GetWeakPtr(), src_url, callback));
 885 }
 886
 887 void CopyOrMoveOperationDelegate::OnCancel() {
 888   // Request to cancel all running Copy/Move file.
 889   for (std::set<CopyOrMoveImpl*>::iterator iter = running_copy_set_.begin();
 890        iter != running_copy_set_.end(); ++iter)
 891     (*iter)->Cancel();
 892 }
 893
 894 void CopyOrMoveOperationDelegate::DidCopyOrMoveFile(
 895     const FileSystemURL& src_url,
 896     const FileSystemURL& dest_url,
 897     const StatusCallback& callback,
 898     CopyOrMoveImpl* impl,
 899     base::File::Error error) {
 900   running_copy_set_.erase(impl);
 901   delete impl;
 902
 903   if (!progress_callback_.is_null() && error == base::File::FILE_OK) {
 904     progress_callback_.Run(
 905         FileSystemOperation::END_COPY_ENTRY, src_url, dest_url, 0);
 906   }
 907
 908   callback.Run(error);
 909 }
 910
 911 void CopyOrMoveOperationDelegate::DidTryRemoveDestRoot(
 912     const StatusCallback& callback,
 913     base::File::Error error) {
 914   if (error == base::File::FILE_ERROR_NOT_A_DIRECTORY) {
 915     callback_.Run(base::File::FILE_ERROR_INVALID_OPERATION);
 916     return;
 917   }
 918   if (error != base::File::FILE_OK &&
 919       error != base::File::FILE_ERROR_NOT_FOUND) {
 920     callback_.Run(error);
 921     return;
 922   }
 923
 924   ProcessDirectoryInternal(src_root_, dest_root_, callback);
 925 }
 926
 927 void CopyOrMoveOperationDelegate::ProcessDirectoryInternal(
 928     const FileSystemURL& src_url,
 929     const FileSystemURL& dest_url,
 930     const StatusCallback& callback) {
 931   // If operation_type == Move we may need to record directories and
 932   // restore directory timestamps in the end, though it may have
 933   // negative performance impact.
 934   // See http://crbug.com/171284 for more details.
 935   operation_runner()->CreateDirectory(
 936       dest_url, false /* exclusive */, false /* recursive */,
 937       base::Bind(&CopyOrMoveOperationDelegate::DidCreateDirectory,
 938                  weak_factory_.GetWeakPtr(), src_url, dest_url, callback));
 939 }
 940
 941 void CopyOrMoveOperationDelegate::DidCreateDirectory(
 942     const FileSystemURL& src_url,
 943     const FileSystemURL& dest_url,
 944     const StatusCallback& callback,
 945     base::File::Error error) {
 946   if (!progress_callback_.is_null() && error == base::File::FILE_OK) {
 947     progress_callback_.Run(
 948         FileSystemOperation::END_COPY_ENTRY, src_url, dest_url, 0);
 949   }
 950
 951   callback.Run(error);
 952 }
 953
 954 void CopyOrMoveOperationDelegate::PostProcessDirectoryAfterGetMetadata(
 955     const FileSystemURL& src_url,
 956     const StatusCallback& callback,
 957     base::File::Error error,
 958     const base::File::Info& file_info) {
 959   if (error != base::File::FILE_OK) {
 960     // Ignore the error, and run post process which should run after TouchFile.
 961     PostProcessDirectoryAfterTouchFile(
 962         src_url, callback, base::File::FILE_OK);
 963     return;
 964   }
 965
 966   operation_runner()->TouchFile(
 967       CreateDestURL(src_url), base::Time::Now() /* last access */,
 968       file_info.last_modified,
 969       base::Bind(
 970           &CopyOrMoveOperationDelegate::PostProcessDirectoryAfterTouchFile,
 971           weak_factory_.GetWeakPtr(), src_url, callback));
 972 }
 973
 974 void CopyOrMoveOperationDelegate::PostProcessDirectoryAfterTouchFile(
 975     const FileSystemURL& src_url,
 976     const StatusCallback& callback,
 977     base::File::Error error) {
 978   // Even if the TouchFile is failed, just ignore it.
 979
 980   if (operation_type_ == OPERATION_COPY) {
 981     callback.Run(base::File::FILE_OK);
 982     return;
 983   }
 984
 985   DCHECK_EQ(OPERATION_MOVE, operation_type_);
 986
 987   // All files and subdirectories in the directory should be moved here,
 988   // so remove the source directory for finalizing move operation.
 989   operation_runner()->Remove(
 990       src_url, false /* recursive */,
 991       base::Bind(&CopyOrMoveOperationDelegate::DidRemoveSourceForMove,
 992                  weak_factory_.GetWeakPtr(), callback));
 993 }
 994
 995 void CopyOrMoveOperationDelegate::DidRemoveSourceForMove(
 996     const StatusCallback& callback,
 997     base::File::Error error) {
 998   if (error == base::File::FILE_ERROR_NOT_FOUND)
 999     error = base::File::FILE_OK;
1000   callback.Run(error);
1001 }
1002
1003 void CopyOrMoveOperationDelegate::OnCopyFileProgress(
1004     const FileSystemURL& src_url, int64 size) {
1005   if (!progress_callback_.is_null()) {
1006     progress_callback_.Run(
1007         FileSystemOperation::PROGRESS, src_url, FileSystemURL(), size);
1008   }
1009 }
1010
1011 FileSystemURL CopyOrMoveOperationDelegate::CreateDestURL(
1012     const FileSystemURL& src_url) const {
1013   DCHECK_EQ(src_root_.type(), src_url.type());
1014   DCHECK_EQ(src_root_.origin(), src_url.origin());
1015
1016   base::FilePath relative = dest_root_.virtual_path();
1017   src_root_.virtual_path().AppendRelativePath(src_url.virtual_path(),
1018                                               &relative);
1019   return file_system_context()->CreateCrackedFileSystemURL(
1020       dest_root_.origin(),
1021       dest_root_.mount_type(),
1022       relative);
1023 }
1024
1025 }  // namespace storage