src/content/browser/dom_storage/dom_storage_host.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_HOST_H_
   6 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_HOST_H_
   7
   8 #include <map>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/strings/nullable_string16.h"
  12 #include "base/strings/string16.h"
  13 #include "content/browser/dom_storage/dom_storage_namespace.h"
  14 #include "content/common/content_export.h"
  15 #include "content/common/dom_storage/dom_storage_types.h"
  16
  17 class GURL;
  18
  19 namespace content {
  20
  21 class DOMStorageContextImpl;
  22 class DOMStorageHost;
  23 class DOMStorageNamespace;
  24 class DOMStorageArea;
  25
  26 // One instance is allocated in the main process for each client process.
  27 // Used by DOMStorageMessageFilter in Chrome.
  28 // This class is single threaded, and performs blocking file reads/writes,
  29 // so it shouldn't be used on chrome's IO thread.
  30 // See class comments for DOMStorageContextImpl for a larger overview.
  31 class CONTENT_EXPORT DOMStorageHost {
  32  public:
  33   DOMStorageHost(DOMStorageContextImpl* context, int render_process_id);
  34   ~DOMStorageHost();
  35
  36   bool OpenStorageArea(int connection_id, int namespace_id,
  37                        const GURL& origin);
  38   void CloseStorageArea(int connection_id);
  39   bool ExtractAreaValues(int connection_id, DOMStorageValuesMap* map,
  40                          bool* send_log_get_messages);
  41   unsigned GetAreaLength(int connection_id);
  42   base::NullableString16 GetAreaKey(int connection_id, unsigned index);
  43   base::NullableString16 GetAreaItem(int connection_id,
  44                                      const base::string16& key);
  45   bool SetAreaItem(int connection_id, const base::string16& key,
  46                    const base::string16& value, const GURL& page_url,
  47                    base::NullableString16* old_value);
  48   void LogGetAreaItem(int connection_id, const base::string16& key,
  49                       const base::NullableString16& value);
  50   bool RemoveAreaItem(int connection_id, const base::string16& key,
  51                   const GURL& page_url,
  52                   base::string16* old_value);
  53   bool ClearArea(int connection_id, const GURL& page_url);
  54   bool HasAreaOpen(int64 namespace_id, const GURL& origin,
  55                    int64* alias_namespace_id) const;
  56   // Resets all open areas for the namespace provided. Returns true
  57   // iff there were any areas to reset.
  58   bool ResetOpenAreasForNamespace(int64 namespace_id);
  59
  60  private:
  61   // Struct to hold references needed for areas that are open
  62   // within our associated client process.
  63   struct NamespaceAndArea {
  64     scoped_refptr<DOMStorageNamespace> namespace_;
  65     scoped_refptr<DOMStorageArea> area_;
  66     NamespaceAndArea();
  67     ~NamespaceAndArea();
  68   };
  69   typedef std::map<int, NamespaceAndArea > AreaMap;
  70
  71   DOMStorageArea* GetOpenArea(int connection_id);
  72   DOMStorageNamespace* GetNamespace(int connection_id);
  73   void MaybeLogTransaction(
  74       int connection_id,
  75       DOMStorageNamespace::LogType transaction_type,
  76       const GURL& origin,
  77       const GURL& page_url,
  78       const base::string16& key,
  79       const base::NullableString16& value);
  80
  81   scoped_refptr<DOMStorageContextImpl> context_;
  82   AreaMap connections_;
  83   int render_process_id_;
  84 };
  85
  86 }  // namespace content
  87
  88 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_HOST_H_