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// Copyright 2018 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 "content/browser/dom_storage/session_storage_area_impl.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "content/browser/dom_storage/session_storage_data_map.h"
#include "content/common/dom_storage/dom_storage_types.h"
#include "third_party/leveldatabase/env_chromium.h"
namespace content {
SessionStorageAreaImpl::SessionStorageAreaImpl(
SessionStorageMetadata::NamespaceEntry namespace_entry,
url::Origin origin,
scoped_refptr<SessionStorageDataMap> data_map,
RegisterNewAreaMap register_new_map_callback)
: namespace_entry_(namespace_entry),
origin_(std::move(origin)),
shared_data_map_(std::move(data_map)),
register_new_map_callback_(std::move(register_new_map_callback)),
binding_(this) {}
SessionStorageAreaImpl::~SessionStorageAreaImpl() {
if (binding_.is_bound())
shared_data_map_->RemoveBindingReference();
}
void SessionStorageAreaImpl::Bind(
blink::mojom::StorageAreaAssociatedRequest request) {
if (IsBound()) {
binding_.Unbind();
} else {
shared_data_map_->AddBindingReference();
}
binding_.Bind(std::move(request));
binding_.set_connection_error_handler(base::BindOnce(
&SessionStorageAreaImpl::OnConnectionError, base::Unretained(this)));
}
std::unique_ptr<SessionStorageAreaImpl> SessionStorageAreaImpl::Clone(
SessionStorageMetadata::NamespaceEntry namespace_entry) {
DCHECK(namespace_entry_ != namespace_entry);
return base::WrapUnique(new SessionStorageAreaImpl(
namespace_entry, origin_, shared_data_map_, register_new_map_callback_));
}
void SessionStorageAreaImpl::NotifyObserversAllDeleted() {
observers_.ForAllPtrs([](blink::mojom::StorageAreaObserver* observer) {
// Renderer process expects |source| to always be two newline separated
// strings.
observer->AllDeleted("\n");
});
}
// blink::mojom::StorageArea:
void SessionStorageAreaImpl::AddObserver(
blink::mojom::StorageAreaObserverAssociatedPtrInfo observer) {
blink::mojom::StorageAreaObserverAssociatedPtr observer_ptr;
observer_ptr.Bind(std::move(observer));
observers_.AddPtr(std::move(observer_ptr));
}
void SessionStorageAreaImpl::Put(
const std::vector<uint8_t>& key,
const std::vector<uint8_t>& value,
const base::Optional<std::vector<uint8_t>>& client_old_value,
const std::string& source,
PutCallback callback) {
DCHECK(IsBound());
DCHECK_NE(0, shared_data_map_->map_data()->ReferenceCount());
if (shared_data_map_->map_data()->ReferenceCount() > 1)
CreateNewMap(NewMapType::FORKED, base::nullopt);
shared_data_map_->storage_area()->Put(key, value, client_old_value, source,
std::move(callback));
}
void SessionStorageAreaImpl::Delete(
const std::vector<uint8_t>& key,
const base::Optional<std::vector<uint8_t>>& client_old_value,
const std::string& source,
DeleteCallback callback) {
DCHECK(IsBound());
DCHECK_NE(0, shared_data_map_->map_data()->ReferenceCount());
if (shared_data_map_->map_data()->ReferenceCount() > 1)
CreateNewMap(NewMapType::FORKED, base::nullopt);
shared_data_map_->storage_area()->Delete(key, client_old_value, source,
std::move(callback));
}
void SessionStorageAreaImpl::DeleteAll(const std::string& source,
DeleteAllCallback callback) {
// Note: This can be called by the Clear Browsing Data flow, and thus doesn't
// have to be bound.
if (shared_data_map_->map_data()->ReferenceCount() > 1) {
CreateNewMap(NewMapType::EMPTY_FROM_DELETE_ALL, source);
std::move(callback).Run(true);
return;
}
shared_data_map_->storage_area()->DeleteAll(source, std::move(callback));
}
void SessionStorageAreaImpl::Get(const std::vector<uint8_t>& key,
GetCallback callback) {
DCHECK(IsBound());
DCHECK_NE(0, shared_data_map_->map_data()->ReferenceCount());
shared_data_map_->storage_area()->Get(key, std::move(callback));
}
void SessionStorageAreaImpl::GetAll(
blink::mojom::StorageAreaGetAllCallbackAssociatedPtrInfo complete_callback,
GetAllCallback callback) {
DCHECK(IsBound());
DCHECK_NE(0, shared_data_map_->map_data()->ReferenceCount());
shared_data_map_->storage_area()->GetAll(std::move(complete_callback),
std::move(callback));
}
// Note: this can be called after invalidation of the |namespace_entry_|.
void SessionStorageAreaImpl::OnConnectionError() {
shared_data_map_->RemoveBindingReference();
// Make sure we totally unbind the binding - this doesn't seem to happen
// automatically on connection error. The bound status is used in the
// destructor to know if |RemoveBindingReference| was already called.
if (binding_.is_bound())
binding_.Unbind();
}
void SessionStorageAreaImpl::CreateNewMap(
NewMapType map_type,
const base::Optional<std::string>& delete_all_source) {
shared_data_map_->RemoveBindingReference();
switch (map_type) {
case NewMapType::FORKED:
shared_data_map_ = SessionStorageDataMap::CreateClone(
shared_data_map_->listener(),
register_new_map_callback_.Run(namespace_entry_, origin_),
shared_data_map_->storage_area());
break;
case NewMapType::EMPTY_FROM_DELETE_ALL: {
// The code optimizes the 'delete all' for shared maps by just creating
// a new map instead of forking. However, we still need the observers to
// be correctly called. To do that, we manually call them here.
shared_data_map_ = SessionStorageDataMap::Create(
shared_data_map_->listener(),
register_new_map_callback_.Run(namespace_entry_, origin_),
shared_data_map_->storage_area()->database());
break;
}
}
shared_data_map_->AddBindingReference();
}
} // namespace content
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