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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 "webkit/browser/fileapi/quota/quota_backend_impl.h"
#include <string>
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/sequenced_task_runner.h"
#include "webkit/browser/fileapi/file_system_usage_cache.h"
#include "webkit/browser/quota/quota_client.h"
#include "webkit/browser/quota/quota_manager_proxy.h"
#include "webkit/common/fileapi/file_system_util.h"
namespace fileapi {
QuotaBackendImpl::QuotaBackendImpl(
base::SequencedTaskRunner* file_task_runner,
ObfuscatedFileUtil* obfuscated_file_util,
FileSystemUsageCache* file_system_usage_cache,
quota::QuotaManagerProxy* quota_manager_proxy)
: file_task_runner_(file_task_runner),
obfuscated_file_util_(obfuscated_file_util),
file_system_usage_cache_(file_system_usage_cache),
quota_manager_proxy_(quota_manager_proxy),
weak_ptr_factory_(this) {
}
QuotaBackendImpl::~QuotaBackendImpl() {
}
void QuotaBackendImpl::ReserveQuota(const GURL& origin,
FileSystemType type,
int64 delta,
const ReserveQuotaCallback& callback) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(origin.is_valid());
if (!delta) {
callback.Run(base::File::FILE_OK, 0);
return;
}
DCHECK(quota_manager_proxy_);
quota_manager_proxy_->GetUsageAndQuota(
file_task_runner_, origin, FileSystemTypeToQuotaStorageType(type),
base::Bind(&QuotaBackendImpl::DidGetUsageAndQuotaForReserveQuota,
weak_ptr_factory_.GetWeakPtr(),
QuotaReservationInfo(origin, type, delta), callback));
}
void QuotaBackendImpl::ReleaseReservedQuota(const GURL& origin,
FileSystemType type,
int64 size) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(origin.is_valid());
DCHECK_LE(0, size);
if (!size)
return;
ReserveQuotaInternal(QuotaReservationInfo(origin, type, -size));
}
void QuotaBackendImpl::CommitQuotaUsage(const GURL& origin,
FileSystemType type,
int64 delta) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(origin.is_valid());
if (!delta)
return;
ReserveQuotaInternal(QuotaReservationInfo(origin, type, delta));
base::FilePath path;
if (GetUsageCachePath(origin, type, &path) != base::File::FILE_OK)
return;
bool result = file_system_usage_cache_->AtomicUpdateUsageByDelta(path, delta);
DCHECK(result);
}
void QuotaBackendImpl::IncrementDirtyCount(const GURL& origin,
FileSystemType type) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(origin.is_valid());
base::FilePath path;
if (GetUsageCachePath(origin, type, &path) != base::File::FILE_OK)
return;
DCHECK(file_system_usage_cache_);
file_system_usage_cache_->IncrementDirty(path);
}
void QuotaBackendImpl::DecrementDirtyCount(const GURL& origin,
FileSystemType type) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(origin.is_valid());
base::FilePath path;
if (GetUsageCachePath(origin, type, &path) != base::File::FILE_OK)
return;
DCHECK(file_system_usage_cache_);
file_system_usage_cache_->DecrementDirty(path);
}
void QuotaBackendImpl::DidGetUsageAndQuotaForReserveQuota(
const QuotaReservationInfo& info,
const ReserveQuotaCallback& callback,
quota::QuotaStatusCode status, int64 usage, int64 quota) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(info.origin.is_valid());
DCHECK_LE(0, usage);
DCHECK_LE(0, quota);
if (status != quota::kQuotaStatusOk) {
callback.Run(base::File::FILE_ERROR_FAILED, 0);
return;
}
QuotaReservationInfo normalized_info = info;
if (info.delta > 0) {
int64 new_usage =
base::saturated_cast<int64>(usage + static_cast<uint64>(info.delta));
if (quota < new_usage)
new_usage = quota;
normalized_info.delta = std::max(static_cast<int64>(0), new_usage - usage);
}
ReserveQuotaInternal(normalized_info);
if (callback.Run(base::File::FILE_OK, normalized_info.delta))
return;
// The requester could not accept the reserved quota. Revert it.
ReserveQuotaInternal(
QuotaReservationInfo(normalized_info.origin,
normalized_info.type,
-normalized_info.delta));
}
void QuotaBackendImpl::ReserveQuotaInternal(const QuotaReservationInfo& info) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(info.origin.is_valid());
DCHECK(quota_manager_proxy_);
quota_manager_proxy_->NotifyStorageModified(
quota::QuotaClient::kFileSystem, info.origin,
FileSystemTypeToQuotaStorageType(info.type), info.delta);
}
base::File::Error QuotaBackendImpl::GetUsageCachePath(
const GURL& origin,
FileSystemType type,
base::FilePath* usage_file_path) {
DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
DCHECK(origin.is_valid());
DCHECK(usage_file_path);
base::File::Error error = base::File::FILE_OK;
*usage_file_path =
SandboxFileSystemBackendDelegate::GetUsageCachePathForOriginAndType(
obfuscated_file_util_, origin, type, &error);
return error;
}
QuotaBackendImpl::QuotaReservationInfo::QuotaReservationInfo(
const GURL& origin, FileSystemType type, int64 delta)
: origin(origin), type(type), delta(delta) {
}
QuotaBackendImpl::QuotaReservationInfo::~QuotaReservationInfo() {
}
} // namespace fileapi
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