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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_STORAGE_STORAGE_CONTROLLER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_STORAGE_STORAGE_CONTROLLER_H_
#include "base/functional/callback.h"
#include "base/sequence_checker.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/common/dom_storage/session_storage_namespace_id.h"
#include "third_party/blink/public/mojom/dom_storage/dom_storage.mojom-blink.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/storage/storage_area.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class CachedStorageArea;
class InspectorDOMStorageAgent;
class LocalDOMWindow;
class LocalFrame;
class StorageNamespace;
// Singleton that manages the creation & accounting for DOMStorage objects. It
// does this by holding weak references to all session storage namespaces, and
// owning the local storage namespace internally. The total cache size is
// exposed with `TotalCacheSize()`, and `ClearAreasIfNeeded()` will - if our
// total cache size is larger than `total_cache_limit` - clear away any cache
// areas in live namespaces that no longer have references from Blink objects.
//
// SessionStorage StorageNamespace objects are created with
// `CreateSessionStorageNamespace` and live as a supplement on the Page.
//
// The LocalStorage StorageNamespace object is owned internally, and
// StorageController delegates the following methods to that namespace:
// GetLocalStorageArea, AddLocalStorageInspectorStorageAgent,
// RemoveLocalStorageInspectorStorageAgent
class MODULES_EXPORT StorageController : public mojom::blink::DomStorageClient {
USING_FAST_MALLOC(StorageController);
public:
// Returns the one global StorageController instance.
static StorageController* GetInstance();
static bool CanAccessStorageArea(LocalFrame* frame,
StorageArea::StorageType type);
// Visible for testing.
struct DomStorageConnection {
mojo::Remote<mojom::blink::DomStorage> dom_storage_remote;
mojo::PendingReceiver<mojom::blink::DomStorageClient> client_receiver;
};
StorageController(DomStorageConnection connection, size_t total_cache_limit);
// Creates a MakeGarbageCollected<StorageNamespace> for Session storage, and
// holds a weak reference for accounting & clearing. If there is already a
// StorageNamespace created for the given id, it is returned.
StorageNamespace* CreateSessionStorageNamespace(Page& page,
const String& namespace_id);
// Returns the total size of all cached areas in namespaces this controller
// knows of.
size_t TotalCacheSize() const;
// Cleans up unused areas if the total cache size is over the cache limit.
void ClearAreasIfNeeded();
// Methods that delegate to the internal StorageNamespace used for
// LocalStorage:
scoped_refptr<CachedStorageArea> GetLocalStorageArea(
LocalDOMWindow* local_dom_window,
mojo::PendingRemote<mojom::blink::StorageArea> local_storage_area = {},
StorageNamespace::StorageContext context =
StorageNamespace::StorageContext::kStandard);
void AddLocalStorageInspectorStorageAgent(InspectorDOMStorageAgent* agent);
void RemoveLocalStorageInspectorStorageAgent(InspectorDOMStorageAgent* agent);
mojom::blink::DomStorage* dom_storage() const {
return dom_storage_remote_.get();
}
private:
void EnsureLocalStorageNamespaceCreated();
// mojom::blink::DomStorageClient:
void ResetStorageAreaAndNamespaceConnections() override;
Persistent<GCedHeapHashMap<String, WeakMember<StorageNamespace>>> namespaces_;
Persistent<StorageNamespace> local_storage_namespace_;
size_t total_cache_limit_;
mojo::Remote<mojom::blink::DomStorage> dom_storage_remote_;
mojo::Receiver<mojom::blink::DomStorageClient> dom_storage_client_receiver_{
this};
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_STORAGE_STORAGE_CONTROLLER_H_
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