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/browser/fileapi/recursive_operation_delegate.h"
  20 #include "storage/common/fileapi/file_system_util.h"
  21
  22 namespace storage {
  23
  24 const int64 kFlushIntervalInBytes = 10 << 20;  // 10MB.
  25
  26 class CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  27  public:
  28   virtual ~CopyOrMoveImpl() {}
  29   virtual void Run(
  30       const CopyOrMoveOperationDelegate::StatusCallback& callback) = 0;
  31   virtual void Cancel() = 0;
  32
  33  protected:
  34   CopyOrMoveImpl() {}
  35
  36  private:
  37   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveImpl);
  38 };
  39
  40 namespace {
  41
  42 // Copies a file on a (same) file system. Just delegate the operation to
  43 // |operation_runner|.
  44 class CopyOrMoveOnSameFileSystemImpl
  45     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  46  public:
  47   CopyOrMoveOnSameFileSystemImpl(
  48       FileSystemOperationRunner* operation_runner,
  49       CopyOrMoveOperationDelegate::OperationType operation_type,
  50       const FileSystemURL& src_url,
  51       const FileSystemURL& dest_url,
  52       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
  53       const FileSystemOperation::CopyFileProgressCallback&
  54           file_progress_callback)
  55       : operation_runner_(operation_runner),
  56         operation_type_(operation_type),
  57         src_url_(src_url),
  58         dest_url_(dest_url),
  59         option_(option),
  60         file_progress_callback_(file_progress_callback) {
  61   }
  62
  63   void Run(
  64       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
  65     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_MOVE) {
  66       operation_runner_->MoveFileLocal(src_url_, dest_url_, option_, callback);
  67     } else {
  68       operation_runner_->CopyFileLocal(
  69           src_url_, dest_url_, option_, file_progress_callback_, callback);
  70     }
  71   }
  72
  73   void Cancel() override {
  74     // We can do nothing for the copy/move operation on a local file system.
  75     // Assuming the operation is quickly done, it should be ok to just wait
  76     // for the completion.
  77   }
  78
  79  private:
  80   FileSystemOperationRunner* operation_runner_;
  81   CopyOrMoveOperationDelegate::OperationType operation_type_;
  82   FileSystemURL src_url_;
  83   FileSystemURL dest_url_;
  84   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
  85   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
  86   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveOnSameFileSystemImpl);
  87 };
  88
  89 // Specifically for cross file system copy/move operation, this class creates
  90 // a snapshot file, validates it if necessary, runs copying process,
  91 // validates the created file, and removes source file for move (noop for
  92 // copy).
  93 class SnapshotCopyOrMoveImpl
  94     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  95  public:
  96   SnapshotCopyOrMoveImpl(
  97       FileSystemOperationRunner* operation_runner,
  98       CopyOrMoveOperationDelegate::OperationType operation_type,
  99       const FileSystemURL& src_url,
 100       const FileSystemURL& dest_url,
 101       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
 102       CopyOrMoveFileValidatorFactory* validator_factory,
 103       const FileSystemOperation::CopyFileProgressCallback&
 104           file_progress_callback)
 105       : operation_runner_(operation_runner),
 106         operation_type_(operation_type),
 107         src_url_(src_url),
 108         dest_url_(dest_url),
 109         option_(option),
 110         validator_factory_(validator_factory),
 111         file_progress_callback_(file_progress_callback),
 112         cancel_requested_(false),
 113         weak_factory_(this) {
 114   }
 115
 116   void Run(
 117       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
 118     file_progress_callback_.Run(0);
 119     operation_runner_->CreateSnapshotFile(
 120         src_url_,
 121         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterCreateSnapshot,
 122                    weak_factory_.GetWeakPtr(), callback));
 123   }
 124
 125   void Cancel() override { cancel_requested_ = true; }
 126
 127  private:
 128   void RunAfterCreateSnapshot(
 129       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 130       base::File::Error error,
 131       const base::File::Info& file_info,
 132       const base::FilePath& platform_path,
 133       const scoped_refptr<storage::ShareableFileReference>& file_ref) {
 134     if (cancel_requested_)
 135       error = base::File::FILE_ERROR_ABORT;
 136
 137     if (error != base::File::FILE_OK) {
 138       callback.Run(error);
 139       return;
 140     }
 141
 142     // For now we assume CreateSnapshotFile always return a valid local file
 143     // path.
 144     DCHECK(!platform_path.empty());
 145
 146     if (!validator_factory_) {
 147       // No validation is needed.
 148       RunAfterPreWriteValidation(platform_path, file_info, file_ref, callback,
 149                                  base::File::FILE_OK);
 150       return;
 151     }
 152
 153     // Run pre write validation.
 154     PreWriteValidation(
 155         platform_path,
 156         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterPreWriteValidation,
 157                    weak_factory_.GetWeakPtr(),
 158                    platform_path, file_info, file_ref, callback));
 159   }
 160
 161   void RunAfterPreWriteValidation(
 162       const base::FilePath& platform_path,
 163       const base::File::Info& file_info,
 164       const scoped_refptr<storage::ShareableFileReference>& file_ref,
 165       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 166       base::File::Error error) {
 167     if (cancel_requested_)
 168       error = base::File::FILE_ERROR_ABORT;
 169
 170     if (error != base::File::FILE_OK) {
 171       callback.Run(error);
 172       return;
 173     }
 174
 175     // |file_ref| is unused but necessary to keep the file alive until
 176     // CopyInForeignFile() is completed.
 177     operation_runner_->CopyInForeignFile(
 178         platform_path, dest_url_,
 179         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterCopyInForeignFile,
 180                    weak_factory_.GetWeakPtr(), file_info, file_ref, callback));
 181   }
 182
 183   void RunAfterCopyInForeignFile(
 184       const base::File::Info& file_info,
 185       const scoped_refptr<storage::ShareableFileReference>& file_ref,
 186       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 187       base::File::Error error) {
 188     if (cancel_requested_)
 189       error = base::File::FILE_ERROR_ABORT;
 190
 191     if (error != base::File::FILE_OK) {
 192       callback.Run(error);
 193       return;
 194     }
 195
 196     file_progress_callback_.Run(file_info.size);
 197
 198     if (option_ == FileSystemOperation::OPTION_NONE) {
 199       RunAfterTouchFile(callback, base::File::FILE_OK);
 200       return;
 201     }
 202
 203     operation_runner_->TouchFile(
 204         dest_url_, base::Time::Now() /* last_access */,
 205         file_info.last_modified,
 206         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterTouchFile,
 207                    weak_factory_.GetWeakPtr(), callback));
 208   }
 209
 210   void RunAfterTouchFile(
 211       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 212       base::File::Error error) {
 213     // Even if TouchFile is failed, just ignore it.
 214
 215     if (cancel_requested_) {
 216       callback.Run(base::File::FILE_ERROR_ABORT);
 217       return;
 218     }
 219
 220     // |validator_| is NULL when the destination filesystem does not do
 221     // validation.
 222     if (!validator_) {
 223       // No validation is needed.
 224       RunAfterPostWriteValidation(callback, base::File::FILE_OK);
 225       return;
 226     }
 227
 228     PostWriteValidation(
 229         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterPostWriteValidation,
 230                    weak_factory_.GetWeakPtr(), callback));
 231   }
 232
 233   void RunAfterPostWriteValidation(
 234       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 235       base::File::Error error) {
 236     if (cancel_requested_) {
 237       callback.Run(base::File::FILE_ERROR_ABORT);
 238       return;
 239     }
 240
 241     if (error != base::File::FILE_OK) {
 242       // Failed to validate. Remove the destination file.
 243       operation_runner_->Remove(
 244           dest_url_, true /* recursive */,
 245           base::Bind(&SnapshotCopyOrMoveImpl::DidRemoveDestForError,
 246                      weak_factory_.GetWeakPtr(), error, callback));
 247       return;
 248     }
 249
 250     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_COPY) {
 251       callback.Run(base::File::FILE_OK);
 252       return;
 253     }
 254
 255     DCHECK_EQ(CopyOrMoveOperationDelegate::OPERATION_MOVE, operation_type_);
 256
 257     // Remove the source for finalizing move operation.
 258     operation_runner_->Remove(
 259         src_url_, true /* recursive */,
 260         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterRemoveSourceForMove,
 261                    weak_factory_.GetWeakPtr(), callback));
 262   }
 263
 264   void RunAfterRemoveSourceForMove(
 265       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 266       base::File::Error error) {
 267     if (cancel_requested_)
 268       error = base::File::FILE_ERROR_ABORT;
 269
 270     if (error == base::File::FILE_ERROR_NOT_FOUND)
 271       error = base::File::FILE_OK;
 272     callback.Run(error);
 273   }
 274
 275   void DidRemoveDestForError(
 276       base::File::Error prior_error,
 277       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 278       base::File::Error error) {
 279     if (error != base::File::FILE_OK) {
 280       VLOG(1) << "Error removing destination file after validation error: "
 281               << error;
 282     }
 283     callback.Run(prior_error);
 284   }
 285
 286   // Runs pre-write validation.
 287   void PreWriteValidation(
 288       const base::FilePath& platform_path,
 289       const CopyOrMoveOperationDelegate::StatusCallback& callback) {
 290     DCHECK(validator_factory_);
 291     validator_.reset(
 292         validator_factory_->CreateCopyOrMoveFileValidator(
 293             src_url_, platform_path));
 294     validator_->StartPreWriteValidation(callback);
 295   }
 296
 297   // Runs post-write validation.
 298   void PostWriteValidation(
 299       const CopyOrMoveOperationDelegate::StatusCallback& callback) {
 300     operation_runner_->CreateSnapshotFile(
 301         dest_url_,
 302         base::Bind(
 303             &SnapshotCopyOrMoveImpl::PostWriteValidationAfterCreateSnapshotFile,
 304             weak_factory_.GetWeakPtr(), callback));
 305   }
 306
 307   void PostWriteValidationAfterCreateSnapshotFile(
 308       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 309       base::File::Error error,
 310       const base::File::Info& file_info,
 311       const base::FilePath& platform_path,
 312       const scoped_refptr<storage::ShareableFileReference>& file_ref) {
 313     if (cancel_requested_)
 314       error = base::File::FILE_ERROR_ABORT;
 315
 316     if (error != base::File::FILE_OK) {
 317       callback.Run(error);
 318       return;
 319     }
 320
 321     DCHECK(validator_);
 322     // Note: file_ref passed here to keep the file alive until after
 323     // the StartPostWriteValidation operation finishes.
 324     validator_->StartPostWriteValidation(
 325         platform_path,
 326         base::Bind(&SnapshotCopyOrMoveImpl::DidPostWriteValidation,
 327                    weak_factory_.GetWeakPtr(), file_ref, callback));
 328   }
 329
 330   // |file_ref| is unused; it is passed here to make sure the reference is
 331   // alive until after post-write validation is complete.
 332   void DidPostWriteValidation(
 333       const scoped_refptr<storage::ShareableFileReference>& file_ref,
 334       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 335       base::File::Error error) {
 336     callback.Run(error);
 337   }
 338
 339   FileSystemOperationRunner* operation_runner_;
 340   CopyOrMoveOperationDelegate::OperationType operation_type_;
 341   FileSystemURL src_url_;
 342   FileSystemURL dest_url_;
 343
 344   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
 345   CopyOrMoveFileValidatorFactory* validator_factory_;
 346   scoped_ptr<CopyOrMoveFileValidator> validator_;
 347   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
 348   bool cancel_requested_;
 349   base::WeakPtrFactory<SnapshotCopyOrMoveImpl> weak_factory_;
 350   DISALLOW_COPY_AND_ASSIGN(SnapshotCopyOrMoveImpl);
 351 };
 352
 353 // The size of buffer for StreamCopyHelper.
 354 const int kReadBufferSize = 32768;
 355
 356 // To avoid too many progress callbacks, it should be called less
 357 // frequently than 50ms.
 358 const int kMinProgressCallbackInvocationSpanInMilliseconds = 50;
 359
 360 // Specifically for cross file system copy/move operation, this class uses
 361 // stream reader and writer for copying. Validator is not supported, so if
 362 // necessary SnapshotCopyOrMoveImpl should be used.
 363 class StreamCopyOrMoveImpl
 364     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
 365  public:
 366   StreamCopyOrMoveImpl(
 367       FileSystemOperationRunner* operation_runner,
 368       FileSystemContext* file_system_context,
 369       CopyOrMoveOperationDelegate::OperationType operation_type,
 370       const FileSystemURL& src_url,
 371       const FileSystemURL& dest_url,
 372       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
 373       scoped_ptr<storage::FileStreamReader> reader,
 374       scoped_ptr<FileStreamWriter> writer,
 375       const FileSystemOperation::CopyFileProgressCallback&
 376           file_progress_callback)
 377       : operation_runner_(operation_runner),
 378         file_system_context_(file_system_context),
 379         operation_type_(operation_type),
 380         src_url_(src_url),
 381         dest_url_(dest_url),
 382         option_(option),
 383         reader_(reader.Pass()),
 384         writer_(writer.Pass()),
 385         file_progress_callback_(file_progress_callback),
 386         cancel_requested_(false),
 387         weak_factory_(this) {}
 388
 389   void Run(
 390       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
 391     // Reader can be created even if the entry does not exist or the entry is
 392     // a directory. To check errors before destination file creation,
 393     // check metadata first.
 394     operation_runner_->GetMetadata(
 395         src_url_,
 396         base::Bind(&StreamCopyOrMoveImpl::RunAfterGetMetadataForSource,
 397                    weak_factory_.GetWeakPtr(), callback));
 398   }
 399
 400   void Cancel() override {
 401     cancel_requested_ = true;
 402     if (copy_helper_)
 403       copy_helper_->Cancel();
 404   }
 405
 406  private:
 407   void NotifyOnStartUpdate(const FileSystemURL& url) {
 408     if (file_system_context_->GetUpdateObservers(url.type())) {
 409       file_system_context_->GetUpdateObservers(url.type())
 410           ->Notify(&FileUpdateObserver::OnStartUpdate, MakeTuple(url));
 411     }
 412   }
 413
 414   void NotifyOnModifyFile(const FileSystemURL& url) {
 415     if (file_system_context_->GetChangeObservers(url.type())) {
 416       file_system_context_->GetChangeObservers(url.type())
 417           ->Notify(&FileChangeObserver::OnModifyFile, MakeTuple(url));
 418     }
 419   }
 420
 421   void NotifyOnEndUpdate(const FileSystemURL& url) {
 422     if (file_system_context_->GetUpdateObservers(url.type())) {
 423       file_system_context_->GetUpdateObservers(url.type())
 424           ->Notify(&FileUpdateObserver::OnEndUpdate, MakeTuple(url));
 425     }
 426   }
 427
 428   void RunAfterGetMetadataForSource(
 429       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 430       base::File::Error error,
 431       const base::File::Info& file_info) {
 432     if (cancel_requested_)
 433       error = base::File::FILE_ERROR_ABORT;
 434
 435     if (error != base::File::FILE_OK) {
 436       callback.Run(error);
 437       return;
 438     }
 439
 440     if (file_info.is_directory) {
 441       // If not a directory, failed with appropriate error code.
 442       callback.Run(base::File::FILE_ERROR_NOT_A_FILE);
 443       return;
 444     }
 445
 446     // To use FileStreamWriter, we need to ensure the destination file exists.
 447     operation_runner_->CreateFile(
 448         dest_url_,
 449         true /* exclusive */,
 450         base::Bind(&StreamCopyOrMoveImpl::RunAfterCreateFileForDestination,
 451                    weak_factory_.GetWeakPtr(),
 452                    callback,
 453                    file_info.last_modified));
 454   }
 455
 456   void RunAfterCreateFileForDestination(
 457       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 458       const base::Time& last_modified,
 459       base::File::Error error) {
 460     if (cancel_requested_)
 461       error = base::File::FILE_ERROR_ABORT;
 462     // This conversion is to return the consistent status code with
 463     // FileSystemFileUtil::Copy.
 464     if (error == base::File::FILE_ERROR_NOT_A_FILE)
 465       error = base::File::FILE_ERROR_INVALID_OPERATION;
 466
 467     if (error != base::File::FILE_OK &&
 468         error != base::File::FILE_ERROR_EXISTS) {
 469       callback.Run(error);
 470       return;
 471     }
 472
 473     if (error == base::File::FILE_ERROR_EXISTS) {
 474       operation_runner_->Truncate(
 475           dest_url_,
 476           0 /* length */,
 477           base::Bind(&StreamCopyOrMoveImpl::RunAfterTruncateForDestination,
 478                      weak_factory_.GetWeakPtr(),
 479                      callback,
 480                      last_modified));
 481       return;
 482     }
 483     RunAfterTruncateForDestination(
 484         callback, last_modified, base::File::FILE_OK);
 485   }
 486
 487   void RunAfterTruncateForDestination(
 488       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 489       const base::Time& last_modified,
 490       base::File::Error error) {
 491     if (cancel_requested_)
 492       error = base::File::FILE_ERROR_ABORT;
 493
 494     if (error != base::File::FILE_OK) {
 495       callback.Run(error);
 496       return;
 497     }
 498
 499     NotifyOnStartUpdate(dest_url_);
 500     DCHECK(!copy_helper_);
 501     copy_helper_.reset(new CopyOrMoveOperationDelegate::StreamCopyHelper(
 502         reader_.Pass(), writer_.Pass(), dest_url_.mount_option().flush_policy(),
 503         kReadBufferSize, file_progress_callback_,
 504         base::TimeDelta::FromMilliseconds(
 505             kMinProgressCallbackInvocationSpanInMilliseconds)));
 506     copy_helper_->Run(
 507         base::Bind(&StreamCopyOrMoveImpl::RunAfterStreamCopy,
 508                    weak_factory_.GetWeakPtr(), callback, last_modified));
 509   }
 510
 511   void RunAfterStreamCopy(
 512       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 513       const base::Time& last_modified,
 514       base::File::Error error) {
 515     NotifyOnModifyFile(dest_url_);
 516     NotifyOnEndUpdate(dest_url_);
 517     if (cancel_requested_)
 518       error = base::File::FILE_ERROR_ABORT;
 519
 520     if (error != base::File::FILE_OK) {
 521       callback.Run(error);
 522       return;
 523     }
 524
 525     if (option_ == FileSystemOperation::OPTION_NONE) {
 526       RunAfterTouchFile(callback, base::File::FILE_OK);
 527       return;
 528     }
 529
 530     operation_runner_->TouchFile(
 531         dest_url_, base::Time::Now() /* last_access */, last_modified,
 532         base::Bind(&StreamCopyOrMoveImpl::RunAfterTouchFile,
 533                    weak_factory_.GetWeakPtr(), callback));
 534   }
 535
 536   void RunAfterTouchFile(
 537       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 538       base::File::Error error) {
 539     // Even if TouchFile is failed, just ignore it.
 540     if (cancel_requested_) {
 541       callback.Run(base::File::FILE_ERROR_ABORT);
 542       return;
 543     }
 544
 545     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_COPY) {
 546       callback.Run(base::File::FILE_OK);
 547       return;
 548     }
 549
 550     DCHECK_EQ(CopyOrMoveOperationDelegate::OPERATION_MOVE, operation_type_);
 551
 552     // Remove the source for finalizing move operation.
 553     operation_runner_->Remove(
 554         src_url_, false /* recursive */,
 555         base::Bind(&StreamCopyOrMoveImpl::RunAfterRemoveForMove,
 556                    weak_factory_.GetWeakPtr(), callback));
 557   }
 558
 559   void RunAfterRemoveForMove(
 560       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 561       base::File::Error error) {
 562     if (cancel_requested_)
 563       error = base::File::FILE_ERROR_ABORT;
 564     if (error == base::File::FILE_ERROR_NOT_FOUND)
 565       error = base::File::FILE_OK;
 566     callback.Run(error);
 567   }
 568
 569   FileSystemOperationRunner* operation_runner_;
 570   scoped_refptr<FileSystemContext> file_system_context_;
 571   CopyOrMoveOperationDelegate::OperationType operation_type_;
 572   FileSystemURL src_url_;
 573   FileSystemURL dest_url_;
 574   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
 575   scoped_ptr<storage::FileStreamReader> reader_;
 576   scoped_ptr<FileStreamWriter> writer_;
 577   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
 578   scoped_ptr<CopyOrMoveOperationDelegate::StreamCopyHelper> copy_helper_;
 579   bool cancel_requested_;
 580   base::WeakPtrFactory<StreamCopyOrMoveImpl> weak_factory_;
 581   DISALLOW_COPY_AND_ASSIGN(StreamCopyOrMoveImpl);
 582 };
 583
 584 }  // namespace
 585
 586 CopyOrMoveOperationDelegate::StreamCopyHelper::StreamCopyHelper(
 587     scoped_ptr<storage::FileStreamReader> reader,
 588     scoped_ptr<FileStreamWriter> writer,
 589     storage::FlushPolicy flush_policy,
 590     int buffer_size,
 591     const FileSystemOperation::CopyFileProgressCallback& file_progress_callback,
 592     const base::TimeDelta& min_progress_callback_invocation_span)
 593     : reader_(reader.Pass()),
 594       writer_(writer.Pass()),
 595       flush_policy_(flush_policy),
 596       file_progress_callback_(file_progress_callback),
 597       io_buffer_(new net::IOBufferWithSize(buffer_size)),
 598       num_copied_bytes_(0),
 599       previous_flush_offset_(0),
 600       min_progress_callback_invocation_span_(
 601           min_progress_callback_invocation_span),
 602       cancel_requested_(false),
 603       weak_factory_(this) {
 604 }
 605
 606 CopyOrMoveOperationDelegate::StreamCopyHelper::~StreamCopyHelper() {
 607 }
 608
 609 void CopyOrMoveOperationDelegate::StreamCopyHelper::Run(
 610     const StatusCallback& callback) {
 611   file_progress_callback_.Run(0);
 612   last_progress_callback_invocation_time_ = base::Time::Now();
 613   Read(callback);
 614 }
 615
 616 void CopyOrMoveOperationDelegate::StreamCopyHelper::Cancel() {
 617   cancel_requested_ = true;
 618 }
 619
 620 void CopyOrMoveOperationDelegate::StreamCopyHelper::Read(
 621     const StatusCallback& callback) {
 622   int result = reader_->Read(
 623       io_buffer_.get(), io_buffer_->size(),
 624       base::Bind(&StreamCopyHelper::DidRead,
 625                  weak_factory_.GetWeakPtr(), callback));
 626   if (result != net::ERR_IO_PENDING)
 627     DidRead(callback, result);
 628 }
 629
 630 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidRead(
 631     const StatusCallback& callback, int result) {
 632   if (cancel_requested_) {
 633     callback.Run(base::File::FILE_ERROR_ABORT);
 634     return;
 635   }
 636
 637   if (result < 0) {
 638     callback.Run(NetErrorToFileError(result));
 639     return;
 640   }
 641
 642   if (result == 0) {
 643     // Here is the EOF.
 644     if (flush_policy_ == storage::FlushPolicy::FLUSH_ON_COMPLETION)
 645       Flush(callback, true /* is_eof */);
 646     else
 647       callback.Run(base::File::FILE_OK);
 648     return;
 649   }
 650
 651   Write(callback, new net::DrainableIOBuffer(io_buffer_.get(), result));
 652 }
 653
 654 void CopyOrMoveOperationDelegate::StreamCopyHelper::Write(
 655     const StatusCallback& callback,
 656     scoped_refptr<net::DrainableIOBuffer> buffer) {
 657   DCHECK_GT(buffer->BytesRemaining(), 0);
 658
 659   int result = writer_->Write(
 660       buffer.get(), buffer->BytesRemaining(),
 661       base::Bind(&StreamCopyHelper::DidWrite,
 662                  weak_factory_.GetWeakPtr(), callback, buffer));
 663   if (result != net::ERR_IO_PENDING)
 664     DidWrite(callback, buffer, result);
 665 }
 666
 667 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidWrite(
 668     const StatusCallback& callback,
 669     scoped_refptr<net::DrainableIOBuffer> buffer,
 670     int result) {
 671   if (cancel_requested_) {
 672     callback.Run(base::File::FILE_ERROR_ABORT);
 673     return;
 674   }
 675
 676   if (result < 0) {
 677     callback.Run(NetErrorToFileError(result));
 678     return;
 679   }
 680
 681   buffer->DidConsume(result);
 682   num_copied_bytes_ += result;
 683
 684   // Check the elapsed time since last |file_progress_callback_| invocation.
 685   base::Time now = base::Time::Now();
 686   if (now - last_progress_callback_invocation_time_ >=
 687       min_progress_callback_invocation_span_) {
 688     file_progress_callback_.Run(num_copied_bytes_);
 689     last_progress_callback_invocation_time_ = now;
 690   }
 691
 692   if (buffer->BytesRemaining() > 0) {
 693     Write(callback, buffer);
 694     return;
 695   }
 696
 697   if (flush_policy_ == storage::FlushPolicy::FLUSH_ON_COMPLETION &&
 698       (num_copied_bytes_ - previous_flush_offset_) > kFlushIntervalInBytes) {
 699     Flush(callback, false /* not is_eof */);
 700   } else {
 701     Read(callback);
 702   }
 703 }
 704
 705 void CopyOrMoveOperationDelegate::StreamCopyHelper::Flush(
 706     const StatusCallback& callback, bool is_eof) {
 707   int result = writer_->Flush(
 708       base::Bind(&StreamCopyHelper::DidFlush,
 709                  weak_factory_.GetWeakPtr(), callback, is_eof));
 710   if (result != net::ERR_IO_PENDING)
 711     DidFlush(callback, is_eof, result);
 712 }
 713
 714 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidFlush(
 715     const StatusCallback& callback, bool is_eof, int result) {
 716   if (cancel_requested_) {
 717     callback.Run(base::File::FILE_ERROR_ABORT);
 718     return;
 719   }
 720
 721   previous_flush_offset_ = num_copied_bytes_;
 722   if (is_eof)
 723     callback.Run(NetErrorToFileError(result));
 724   else
 725     Read(callback);
 726 }
 727
 728 CopyOrMoveOperationDelegate::CopyOrMoveOperationDelegate(
 729     FileSystemContext* file_system_context,
 730     const FileSystemURL& src_root,
 731     const FileSystemURL& dest_root,
 732     OperationType operation_type,
 733     CopyOrMoveOption option,
 734     const CopyProgressCallback& progress_callback,
 735     const StatusCallback& callback)
 736     : RecursiveOperationDelegate(file_system_context),
 737       src_root_(src_root),
 738       dest_root_(dest_root),
 739       operation_type_(operation_type),
 740       option_(option),
 741       progress_callback_(progress_callback),
 742       callback_(callback),
 743       weak_factory_(this) {
 744   same_file_system_ = src_root_.IsInSameFileSystem(dest_root_);
 745 }
 746
 747 CopyOrMoveOperationDelegate::~CopyOrMoveOperationDelegate() {
 748   STLDeleteElements(&running_copy_set_);
 749 }
 750
 751 void CopyOrMoveOperationDelegate::Run() {
 752   // Not supported; this should never be called.
 753   NOTREACHED();
 754 }
 755
 756 void CopyOrMoveOperationDelegate::RunRecursively() {
 757   // Perform light-weight checks first.
 758
 759   // It is an error to try to copy/move an entry into its child.
 760   if (same_file_system_ && src_root_.path().IsParent(dest_root_.path())) {
 761     callback_.Run(base::File::FILE_ERROR_INVALID_OPERATION);
 762     return;
 763   }
 764
 765   if (same_file_system_ && src_root_.path() == dest_root_.path()) {
 766     // In JS API this should return error, but we return success because Pepper
 767     // wants to return success and we have a code path that returns error in
 768     // Blink for JS (http://crbug.com/329517).
 769     callback_.Run(base::File::FILE_OK);
 770     return;
 771   }
 772
 773   // Start to process the source directory recursively.
 774   // TODO(kinuko): This could be too expensive for same_file_system_==true
 775   // and operation==MOVE case, probably we can just rename the root directory.
 776   // http://crbug.com/172187
 777   StartRecursiveOperation(src_root_, callback_);
 778 }
 779
 780 void CopyOrMoveOperationDelegate::ProcessFile(
 781     const FileSystemURL& src_url,
 782     const StatusCallback& callback) {
 783   if (!progress_callback_.is_null()) {
 784     progress_callback_.Run(
 785         FileSystemOperation::BEGIN_COPY_ENTRY, src_url, FileSystemURL(), 0);
 786   }
 787
 788   FileSystemURL dest_url = CreateDestURL(src_url);
 789   CopyOrMoveImpl* impl = NULL;
 790   if (same_file_system_ &&
 791       (file_system_context()
 792            ->GetFileSystemBackend(src_url.type())
 793            ->HasInplaceCopyImplementation(src_url.type()) ||
 794        operation_type_ == OPERATION_MOVE)) {
 795     impl = new CopyOrMoveOnSameFileSystemImpl(
 796         operation_runner(), operation_type_, src_url, dest_url, option_,
 797         base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 798                    weak_factory_.GetWeakPtr(), src_url));
 799   } else {
 800     // Cross filesystem case.
 801     base::File::Error error = base::File::FILE_ERROR_FAILED;
 802     CopyOrMoveFileValidatorFactory* validator_factory =
 803         file_system_context()->GetCopyOrMoveFileValidatorFactory(
 804             dest_root_.type(), &error);
 805     if (error != base::File::FILE_OK) {
 806       callback.Run(error);
 807       return;
 808     }
 809
 810     if (!validator_factory) {
 811       scoped_ptr<storage::FileStreamReader> reader =
 812           file_system_context()->CreateFileStreamReader(
 813               src_url, 0 /* offset */, storage::kMaximumLength, base::Time());
 814       scoped_ptr<FileStreamWriter> writer =
 815           file_system_context()->CreateFileStreamWriter(dest_url, 0);
 816       if (reader && writer) {
 817         impl = new StreamCopyOrMoveImpl(
 818             operation_runner(),
 819             file_system_context(),
 820             operation_type_,
 821             src_url,
 822             dest_url,
 823             option_,
 824             reader.Pass(),
 825             writer.Pass(),
 826             base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 827                        weak_factory_.GetWeakPtr(),
 828                        src_url));
 829       }
 830     }
 831
 832     if (!impl) {
 833       impl = new SnapshotCopyOrMoveImpl(
 834           operation_runner(), operation_type_, src_url, dest_url, option_,
 835           validator_factory,
 836           base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 837                      weak_factory_.GetWeakPtr(), src_url));
 838     }
 839   }
 840
 841   // Register the running task.
 842   running_copy_set_.insert(impl);
 843   impl->Run(base::Bind(
 844       &CopyOrMoveOperationDelegate::DidCopyOrMoveFile,
 845       weak_factory_.GetWeakPtr(), src_url, dest_url, callback, impl));
 846 }
 847
 848 void CopyOrMoveOperationDelegate::ProcessDirectory(
 849     const FileSystemURL& src_url,
 850     const StatusCallback& callback) {
 851   if (src_url == src_root_) {
 852     // The src_root_ looks to be a directory.
 853     // Try removing the dest_root_ to see if it exists and/or it is an
 854     // empty directory.
 855     // We do not invoke |progress_callback_| for source root, because it is
 856     // already called in ProcessFile().
 857     operation_runner()->RemoveDirectory(
 858         dest_root_,
 859         base::Bind(&CopyOrMoveOperationDelegate::DidTryRemoveDestRoot,
 860                    weak_factory_.GetWeakPtr(), callback));
 861     return;
 862   }
 863
 864   if (!progress_callback_.is_null()) {
 865     progress_callback_.Run(
 866         FileSystemOperation::BEGIN_COPY_ENTRY, src_url, FileSystemURL(), 0);
 867   }
 868
 869   ProcessDirectoryInternal(src_url, CreateDestURL(src_url), callback);
 870 }
 871
 872 void CopyOrMoveOperationDelegate::PostProcessDirectory(
 873     const FileSystemURL& src_url,
 874     const StatusCallback& callback) {
 875   if (option_ == FileSystemOperation::OPTION_NONE) {
 876     PostProcessDirectoryAfterTouchFile(
 877         src_url, callback, base::File::FILE_OK);
 878     return;
 879   }
 880
 881   operation_runner()->GetMetadata(
 882       src_url,
 883       base::Bind(
 884           &CopyOrMoveOperationDelegate::PostProcessDirectoryAfterGetMetadata,
 885           weak_factory_.GetWeakPtr(), src_url, callback));
 886 }
 887
 888 void CopyOrMoveOperationDelegate::OnCancel() {
 889   // Request to cancel all running Copy/Move file.
 890   for (std::set<CopyOrMoveImpl*>::iterator iter = running_copy_set_.begin();
 891        iter != running_copy_set_.end(); ++iter)
 892     (*iter)->Cancel();
 893 }
 894
 895 void CopyOrMoveOperationDelegate::DidCopyOrMoveFile(
 896     const FileSystemURL& src_url,
 897     const FileSystemURL& dest_url,
 898     const StatusCallback& callback,
 899     CopyOrMoveImpl* impl,
 900     base::File::Error error) {
 901   running_copy_set_.erase(impl);
 902   delete impl;
 903
 904   if (!progress_callback_.is_null() && error == base::File::FILE_OK) {
 905     progress_callback_.Run(
 906         FileSystemOperation::END_COPY_ENTRY, src_url, dest_url, 0);
 907   }
 908
 909   callback.Run(error);
 910 }
 911
 912 void CopyOrMoveOperationDelegate::DidTryRemoveDestRoot(
 913     const StatusCallback& callback,
 914     base::File::Error error) {
 915   if (error == base::File::FILE_ERROR_NOT_A_DIRECTORY) {
 916     callback_.Run(base::File::FILE_ERROR_INVALID_OPERATION);
 917     return;
 918   }
 919   if (error != base::File::FILE_OK &&
 920       error != base::File::FILE_ERROR_NOT_FOUND) {
 921     callback_.Run(error);
 922     return;
 923   }
 924
 925   ProcessDirectoryInternal(src_root_, dest_root_, callback);
 926 }
 927
 928 void CopyOrMoveOperationDelegate::ProcessDirectoryInternal(
 929     const FileSystemURL& src_url,
 930     const FileSystemURL& dest_url,
 931     const StatusCallback& callback) {
 932   // If operation_type == Move we may need to record directories and
 933   // restore directory timestamps in the end, though it may have
 934   // negative performance impact.
 935   // See http://crbug.com/171284 for more details.
 936   operation_runner()->CreateDirectory(
 937       dest_url, false /* exclusive */, false /* recursive */,
 938       base::Bind(&CopyOrMoveOperationDelegate::DidCreateDirectory,
 939                  weak_factory_.GetWeakPtr(), src_url, dest_url, callback));
 940 }
 941
 942 void CopyOrMoveOperationDelegate::DidCreateDirectory(
 943     const FileSystemURL& src_url,
 944     const FileSystemURL& dest_url,
 945     const StatusCallback& callback,
 946     base::File::Error error) {
 947   if (!progress_callback_.is_null() && error == base::File::FILE_OK) {
 948     progress_callback_.Run(
 949         FileSystemOperation::END_COPY_ENTRY, src_url, dest_url, 0);
 950   }
 951
 952   callback.Run(error);
 953 }
 954
 955 void CopyOrMoveOperationDelegate::PostProcessDirectoryAfterGetMetadata(
 956     const FileSystemURL& src_url,
 957     const StatusCallback& callback,
 958     base::File::Error error,
 959     const base::File::Info& file_info) {
 960   if (error != base::File::FILE_OK) {
 961     // Ignore the error, and run post process which should run after TouchFile.
 962     PostProcessDirectoryAfterTouchFile(
 963         src_url, callback, base::File::FILE_OK);
 964     return;
 965   }
 966
 967   operation_runner()->TouchFile(
 968       CreateDestURL(src_url), base::Time::Now() /* last access */,
 969       file_info.last_modified,
 970       base::Bind(
 971           &CopyOrMoveOperationDelegate::PostProcessDirectoryAfterTouchFile,
 972           weak_factory_.GetWeakPtr(), src_url, callback));
 973 }
 974
 975 void CopyOrMoveOperationDelegate::PostProcessDirectoryAfterTouchFile(
 976     const FileSystemURL& src_url,
 977     const StatusCallback& callback,
 978     base::File::Error error) {
 979   // Even if the TouchFile is failed, just ignore it.
 980
 981   if (operation_type_ == OPERATION_COPY) {
 982     callback.Run(base::File::FILE_OK);
 983     return;
 984   }
 985
 986   DCHECK_EQ(OPERATION_MOVE, operation_type_);
 987
 988   // All files and subdirectories in the directory should be moved here,
 989   // so remove the source directory for finalizing move operation.
 990   operation_runner()->Remove(
 991       src_url, false /* recursive */,
 992       base::Bind(&CopyOrMoveOperationDelegate::DidRemoveSourceForMove,
 993                  weak_factory_.GetWeakPtr(), callback));
 994 }
 995
 996 void CopyOrMoveOperationDelegate::DidRemoveSourceForMove(
 997     const StatusCallback& callback,
 998     base::File::Error error) {
 999   if (error == base::File::FILE_ERROR_NOT_FOUND)
1000     error = base::File::FILE_OK;
1001   callback.Run(error);
1002 }
1003
1004 void CopyOrMoveOperationDelegate::OnCopyFileProgress(
1005     const FileSystemURL& src_url, int64 size) {
1006   if (!progress_callback_.is_null()) {
1007     progress_callback_.Run(
1008         FileSystemOperation::PROGRESS, src_url, FileSystemURL(), size);
1009   }
1010 }
1011
1012 FileSystemURL CopyOrMoveOperationDelegate::CreateDestURL(
1013     const FileSystemURL& src_url) const {
1014   DCHECK_EQ(src_root_.type(), src_url.type());
1015   DCHECK_EQ(src_root_.origin(), src_url.origin());
1016
1017   base::FilePath relative = dest_root_.virtual_path();
1018   src_root_.virtual_path().AppendRelativePath(src_url.virtual_path(),
1019                                               &relative);
1020   return file_system_context()->CreateCrackedFileSystemURL(
1021       dest_root_.origin(),
1022       dest_root_.mount_type(),
1023       relative);
1024 }
1025
1026 }  // namespace storage