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// 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 "chrome/browser/chromeos/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/message_loop/message_loop_proxy.h"
#include "base/sequenced_task_runner.h"
#include "base/task_runner_util.h"
#include "chrome/browser/chromeos/drive/drive.pb.h"
#include "chrome/browser/chromeos/drive/file_cache.h"
#include "chrome/browser/chromeos/drive/file_errors.h"
#include "chrome/browser/chromeos/drive/file_system/download_operation.h"
#include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
#include "chrome/browser/chromeos/drive/job_scheduler.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
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,
OperationObserver* observer,
JobScheduler* scheduler,
internal::ResourceMetadata* metadata,
internal::FileCache* cache,
const base::FilePath& temporary_file_directory)
: blocking_task_runner_(blocking_task_runner),
observer_(observer),
metadata_(metadata),
cache_(cache),
download_operation_(new DownloadOperation(blocking_task_runner,
observer,
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(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(!callback.is_null());
if (length < 0) {
base::MessageLoopProxy::current()->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(BrowserThread::CurrentlyOn(BrowserThread::UI));
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(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(!callback.is_null());
observer_->OnEntryUpdatedByOperation(local_id);
callback.Run(error);
}
} // namespace file_system
} // namespace drive
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