| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/drive/file_system/truncate_operation.h" |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/files/file.h" |
| #include "base/files/file_path.h" |
| #include "base/logging.h" |
| #include "base/sequenced_task_runner.h" |
| #include "base/task_runner_util.h" |
| #include "base/thread_task_runner_handle.h" |
| #include "components/drive/drive.pb.h" |
| #include "components/drive/file_cache.h" |
| #include "components/drive/file_errors.h" |
| #include "components/drive/file_system/download_operation.h" |
| #include "components/drive/file_system/operation_delegate.h" |
| #include "components/drive/job_scheduler.h" |
| |
| namespace drive { |
| namespace file_system { |
| namespace { |
| |
| // Truncates the local file at |local_cache_path| to the |length| bytes, |
| // then marks the resource is dirty on |cache|. |
| FileError TruncateOnBlockingPool(internal::ResourceMetadata* metadata, |
| internal::FileCache* cache, |
| const std::string& local_id, |
| const base::FilePath& local_cache_path, |
| int64 length) { |
| DCHECK(metadata); |
| DCHECK(cache); |
| |
| scoped_ptr<base::ScopedClosureRunner> file_closer; |
| FileError error = cache->OpenForWrite(local_id, &file_closer); |
| if (error != FILE_ERROR_OK) |
| return error; |
| |
| base::File file(local_cache_path, |
| base::File::FLAG_OPEN | base::File::FLAG_WRITE); |
| if (!file.IsValid()) |
| return FILE_ERROR_FAILED; |
| |
| if (!file.SetLength(length)) |
| return FILE_ERROR_FAILED; |
| |
| return FILE_ERROR_OK; |
| } |
| |
| } // namespace |
| |
| TruncateOperation::TruncateOperation( |
| base::SequencedTaskRunner* blocking_task_runner, |
| OperationDelegate* delegate, |
| JobScheduler* scheduler, |
| internal::ResourceMetadata* metadata, |
| internal::FileCache* cache, |
| const base::FilePath& temporary_file_directory) |
| : blocking_task_runner_(blocking_task_runner), |
| delegate_(delegate), |
| metadata_(metadata), |
| cache_(cache), |
| download_operation_(new DownloadOperation(blocking_task_runner, |
| delegate, |
| scheduler, |
| metadata, |
| cache, |
| temporary_file_directory)), |
| weak_ptr_factory_(this) { |
| } |
| |
| TruncateOperation::~TruncateOperation() { |
| } |
| |
| void TruncateOperation::Truncate(const base::FilePath& file_path, |
| int64 length, |
| const FileOperationCallback& callback) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!callback.is_null()); |
| |
| if (length < 0) { |
| base::ThreadTaskRunnerHandle::Get()->PostTask( |
| FROM_HERE, |
| base::Bind(callback, FILE_ERROR_INVALID_OPERATION)); |
| return; |
| } |
| |
| // TODO(kinaba): http://crbug.com/132780. |
| // Optimize the cases for small |length|, at least for |length| == 0. |
| download_operation_->EnsureFileDownloadedByPath( |
| file_path, |
| ClientContext(USER_INITIATED), |
| GetFileContentInitializedCallback(), |
| google_apis::GetContentCallback(), |
| base::Bind(&TruncateOperation::TruncateAfterEnsureFileDownloadedByPath, |
| weak_ptr_factory_.GetWeakPtr(), length, callback)); |
| } |
| |
| void TruncateOperation::TruncateAfterEnsureFileDownloadedByPath( |
| int64 length, |
| const FileOperationCallback& callback, |
| FileError error, |
| const base::FilePath& local_file_path, |
| scoped_ptr<ResourceEntry> entry) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!callback.is_null()); |
| |
| if (error != FILE_ERROR_OK) { |
| callback.Run(error); |
| return; |
| } |
| DCHECK(entry); |
| DCHECK(entry->has_file_specific_info()); |
| |
| if (entry->file_specific_info().is_hosted_document()) { |
| callback.Run(FILE_ERROR_INVALID_OPERATION); |
| return; |
| } |
| |
| base::PostTaskAndReplyWithResult( |
| blocking_task_runner_.get(), |
| FROM_HERE, |
| base::Bind(&TruncateOnBlockingPool, |
| metadata_, cache_, entry->local_id(), local_file_path, length), |
| base::Bind( |
| &TruncateOperation::TruncateAfterTruncateOnBlockingPool, |
| weak_ptr_factory_.GetWeakPtr(), entry->local_id(), callback)); |
| } |
| |
| void TruncateOperation::TruncateAfterTruncateOnBlockingPool( |
| const std::string& local_id, |
| const FileOperationCallback& callback, |
| FileError error) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!callback.is_null()); |
| |
| delegate_->OnEntryUpdatedByOperation(ClientContext(USER_INITIATED), local_id); |
| |
| callback.Run(error); |
| } |
| |
| } // namespace file_system |
| } // namespace drive |