зеркало из https://github.com/mozilla/gecko-dev.git
138 строки
4.7 KiB
C++
138 строки
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_StorageManager_h
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#define mozilla_dom_StorageManager_h
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#include "nsIDOMStorageManager.h"
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#include "nsILocalStorageManager.h"
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#include "StorageObserver.h"
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#include "LocalStorage.h"
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#include "LocalStorageCache.h"
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#include "mozilla/dom/Storage.h"
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#include "nsTHashtable.h"
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#include "nsDataHashtable.h"
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#include "nsClassHashtable.h"
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#include "nsHashKeys.h"
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namespace mozilla {
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class OriginAttributesPattern;
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namespace dom {
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class LocalStorageManager final : public nsIDOMStorageManager,
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public nsILocalStorageManager,
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public StorageObserverSink {
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NS_DECL_ISUPPORTS
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NS_DECL_NSIDOMSTORAGEMANAGER
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NS_DECL_NSILOCALSTORAGEMANAGER
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public:
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LocalStorageManager();
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// Reads the preference for DOM storage quota
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static uint32_t GetQuota();
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// Gets (but not ensures) cache for the given scope
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LocalStorageCache* GetCache(const nsACString& aOriginSuffix,
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const nsACString& aOriginNoSuffix);
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// Returns object keeping usage cache for the scope.
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already_AddRefed<StorageUsage> GetOriginUsage(
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const nsACString& aOriginNoSuffix);
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static nsAutoCString CreateOrigin(const nsACString& aOriginSuffix,
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const nsACString& aOriginNoSuffix);
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private:
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~LocalStorageManager();
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// StorageObserverSink, handler to various chrome clearing notification
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nsresult Observe(const char* aTopic,
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const nsAString& aOriginAttributesPattern,
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const nsACString& aOriginScope) override;
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// Since nsTHashtable doesn't like multiple inheritance, we have to aggregate
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// LocalStorageCache into the entry.
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class LocalStorageCacheHashKey : public nsCStringHashKey {
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public:
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explicit LocalStorageCacheHashKey(const nsACString* aKey)
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: nsCStringHashKey(aKey), mCache(new LocalStorageCache(aKey)) {}
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LocalStorageCacheHashKey(LocalStorageCacheHashKey&& aOther)
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: nsCStringHashKey(std::move(aOther)),
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mCache(std::move(aOther.mCache)),
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mCacheRef(std::move(aOther.mCacheRef)) {
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NS_ERROR("Shouldn't be called");
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}
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LocalStorageCache* cache() { return mCache; }
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// Keep the cache referenced forever, used for sessionStorage.
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void HardRef() { mCacheRef = mCache; }
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private:
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// weak ref only since cache references its manager.
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LocalStorageCache* mCache;
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// hard ref when this is sessionStorage to keep it alive forever.
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RefPtr<LocalStorageCache> mCacheRef;
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};
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// Ensures cache for a scope, when it doesn't exist it is created and
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// initalized, this also starts preload of persistent data.
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already_AddRefed<LocalStorageCache> PutCache(
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const nsACString& aOriginSuffix, const nsACString& aOriginNoSuffix,
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nsIPrincipal* aPrincipal);
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enum class CreateMode {
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// GetStorage: do not create if it's not already in memory.
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UseIfExistsNeverCreate,
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// CreateStorage: Create it if it's not already in memory.
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CreateAlways,
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// PrecacheStorage: Create only if the database says we ShouldPreloadOrigin.
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CreateIfShouldPreload
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};
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// Helper for creation of DOM storage objects
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nsresult GetStorageInternal(CreateMode aCreate, mozIDOMWindow* aWindow,
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nsIPrincipal* aPrincipal,
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nsIPrincipal* aStoragePrincipal,
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const nsAString& aDocumentURI, bool aPrivate,
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Storage** aRetval);
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// Suffix->origin->cache map
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typedef nsTHashtable<LocalStorageCacheHashKey> CacheOriginHashtable;
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nsClassHashtable<nsCStringHashKey, CacheOriginHashtable> mCaches;
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void ClearCaches(uint32_t aUnloadFlags,
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const OriginAttributesPattern& aPattern,
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const nsACString& aKeyPrefix);
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// Global getter of localStorage manager service
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static LocalStorageManager* Self();
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// Like Self, but creates an instance if we're not yet initialized.
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static LocalStorageManager* Ensure();
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private:
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// Keeps usage cache objects for eTLD+1 scopes we have touched.
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nsDataHashtable<nsCStringHashKey, RefPtr<StorageUsage> > mUsages;
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friend class LocalStorageCache;
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friend class StorageDBChild;
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// Releases cache since it is no longer referrered by any Storage object.
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virtual void DropCache(LocalStorageCache* aCache);
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static LocalStorageManager* sSelf;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_StorageManager_h
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