src/webkit/browser/quota/usage_tracker.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 WEBKIT_BROWSER_QUOTA_USAGE_TRACKER_H_
   6 #define WEBKIT_BROWSER_QUOTA_USAGE_TRACKER_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <set>
  11 #include <string>
  12
  13 #include "base/basictypes.h"
  14 #include "base/callback.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/threading/non_thread_safe.h"
  17 #include "url/gurl.h"
  18 #include "webkit/browser/quota/quota_callbacks.h"
  19 #include "webkit/browser/quota/quota_client.h"
  20 #include "webkit/browser/quota/quota_task.h"
  21 #include "webkit/browser/quota/special_storage_policy.h"
  22 #include "webkit/browser/webkit_storage_browser_export.h"
  23 #include "webkit/common/quota/quota_types.h"
  24
  25 namespace quota {
  26
  27 class ClientUsageTracker;
  28 class StorageMonitor;
  29
  30 // A helper class that gathers and tracks the amount of data stored in
  31 // all quota clients.
  32 // An instance of this class is created per storage type.
  33 class WEBKIT_STORAGE_BROWSER_EXPORT UsageTracker : public QuotaTaskObserver {
  34  public:
  35   UsageTracker(const QuotaClientList& clients, StorageType type,
  36                SpecialStoragePolicy* special_storage_policy,
  37                StorageMonitor* storage_monitor);
  38   virtual ~UsageTracker();
  39
  40   StorageType type() const { return type_; }
  41   ClientUsageTracker* GetClientTracker(QuotaClient::ID client_id);
  42
  43   void GetGlobalLimitedUsage(const UsageCallback& callback);
  44   void GetGlobalUsage(const GlobalUsageCallback& callback);
  45   void GetHostUsage(const std::string& host, const UsageCallback& callback);
  46   void UpdateUsageCache(QuotaClient::ID client_id,
  47                         const GURL& origin,
  48                         int64 delta);
  49   void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
  50   void GetCachedOrigins(std::set<GURL>* origins) const;
  51   bool IsWorking() const {
  52     return global_usage_callbacks_.HasCallbacks() ||
  53            host_usage_callbacks_.HasAnyCallbacks();
  54   }
  55
  56   void SetUsageCacheEnabled(QuotaClient::ID client_id,
  57                             const GURL& origin,
  58                             bool enabled);
  59
  60  private:
  61   struct AccumulateInfo {
  62     AccumulateInfo() : pending_clients(0), usage(0), unlimited_usage(0) {}
  63     int pending_clients;
  64     int64 usage;
  65     int64 unlimited_usage;
  66   };
  67
  68   typedef std::map<QuotaClient::ID, ClientUsageTracker*> ClientTrackerMap;
  69
  70   friend class ClientUsageTracker;
  71   void AccumulateClientGlobalLimitedUsage(AccumulateInfo* info,
  72                                           int64 limited_usage);
  73   void AccumulateClientGlobalUsage(AccumulateInfo* info,
  74                                    int64 usage,
  75                                    int64 unlimited_usage);
  76   void AccumulateClientHostUsage(AccumulateInfo* info,
  77                                  const std::string& host,
  78                                  int64 usage);
  79
  80   const StorageType type_;
  81   ClientTrackerMap client_tracker_map_;
  82
  83   UsageCallbackQueue global_limited_usage_callbacks_;
  84   GlobalUsageCallbackQueue global_usage_callbacks_;
  85   HostUsageCallbackMap host_usage_callbacks_;
  86
  87   StorageMonitor* storage_monitor_;
  88
  89   base::WeakPtrFactory<UsageTracker> weak_factory_;
  90   DISALLOW_COPY_AND_ASSIGN(UsageTracker);
  91 };
  92
  93 // This class holds per-client usage tracking information and caches per-host
  94 // usage data.  An instance of this class is created per client.
  95 class ClientUsageTracker : public SpecialStoragePolicy::Observer,
  96                            public base::NonThreadSafe,
  97                            public base::SupportsWeakPtr<ClientUsageTracker> {
  98  public:
  99   typedef base::Callback<void(int64 limited_usage,
 100                               int64 unlimited_usage)> HostUsageAccumulator;
 101   typedef base::Callback<void(const GURL& origin,
 102                               int64 usage)> OriginUsageAccumulator;
 103   typedef std::map<std::string, std::set<GURL> > OriginSetByHost;
 104
 105   ClientUsageTracker(UsageTracker* tracker,
 106                      QuotaClient* client,
 107                      StorageType type,
 108                      SpecialStoragePolicy* special_storage_policy,
 109                      StorageMonitor* storage_monitor);
 110   virtual ~ClientUsageTracker();
 111
 112   void GetGlobalLimitedUsage(const UsageCallback& callback);
 113   void GetGlobalUsage(const GlobalUsageCallback& callback);
 114   void GetHostUsage(const std::string& host, const UsageCallback& callback);
 115   void UpdateUsageCache(const GURL& origin, int64 delta);
 116   void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
 117   void GetCachedOrigins(std::set<GURL>* origins) const;
 118   int64 GetCachedOriginsUsage(const std::set<GURL>& origins,
 119                               std::vector<GURL>* origins_not_in_cache);
 120   bool IsUsageCacheEnabledForOrigin(const GURL& origin) const;
 121   void SetUsageCacheEnabled(const GURL& origin, bool enabled);
 122
 123  private:
 124   typedef CallbackQueueMap<HostUsageAccumulator, std::string,
 125                            Tuple2<int64, int64> > HostUsageAccumulatorMap;
 126
 127   typedef std::set<std::string> HostSet;
 128   typedef std::map<GURL, int64> UsageMap;
 129   typedef std::map<std::string, UsageMap> HostUsageMap;
 130
 131   struct AccumulateInfo {
 132     int pending_jobs;
 133     int64 limited_usage;
 134     int64 unlimited_usage;
 135
 136     AccumulateInfo()
 137         : pending_jobs(0), limited_usage(0), unlimited_usage(0) {}
 138   };
 139
 140   void AccumulateLimitedOriginUsage(AccumulateInfo* info,
 141                                     const UsageCallback& callback,
 142                                     int64 usage);
 143   void DidGetOriginsForGlobalUsage(const GlobalUsageCallback& callback,
 144                                    const std::set<GURL>& origins);
 145   void AccumulateHostUsage(AccumulateInfo* info,
 146                            const GlobalUsageCallback& callback,
 147                            int64 limited_usage,
 148                            int64 unlimited_usage);
 149
 150   void DidGetOriginsForHostUsage(const std::string& host,
 151                                  const std::set<GURL>& origins);
 152
 153   void GetUsageForOrigins(const std::string& host,
 154                           const std::set<GURL>& origins);
 155   void AccumulateOriginUsage(AccumulateInfo* info,
 156                              const std::string& host,
 157                              const GURL& origin,
 158                              int64 usage);
 159
 160   void DidGetHostUsageAfterUpdate(const GURL& origin, int64 usage);
 161
 162   // Methods used by our GatherUsage tasks, as a task makes progress
 163   // origins and hosts are added incrementally to the cache.
 164   void AddCachedOrigin(const GURL& origin, int64 usage);
 165   void AddCachedHost(const std::string& host);
 166
 167   int64 GetCachedHostUsage(const std::string& host) const;
 168   int64 GetCachedGlobalUnlimitedUsage();
 169   bool GetCachedOriginUsage(const GURL& origin, int64* usage) const;
 170
 171   // SpecialStoragePolicy::Observer overrides
 172   virtual void OnGranted(const GURL& origin, int change_flags) OVERRIDE;
 173   virtual void OnRevoked(const GURL& origin, int change_flags) OVERRIDE;
 174   virtual void OnCleared() OVERRIDE;
 175
 176   bool IsStorageUnlimited(const GURL& origin) const;
 177
 178   UsageTracker* tracker_;
 179   QuotaClient* client_;
 180   const StorageType type_;
 181   StorageMonitor* storage_monitor_;
 182
 183   int64 global_limited_usage_;
 184   int64 global_unlimited_usage_;
 185   bool global_usage_retrieved_;
 186   HostSet cached_hosts_;
 187   HostUsageMap cached_usage_by_host_;
 188
 189   OriginSetByHost non_cached_limited_origins_by_host_;
 190   OriginSetByHost non_cached_unlimited_origins_by_host_;
 191
 192   GlobalUsageCallbackQueue global_usage_callback_;
 193   HostUsageAccumulatorMap host_usage_accumulators_;
 194
 195   scoped_refptr<SpecialStoragePolicy> special_storage_policy_;
 196
 197   DISALLOW_COPY_AND_ASSIGN(ClientUsageTracker);
 198 };
 199
 200 }  // namespace quota
 201
 202 #endif  // WEBKIT_BROWSER_QUOTA_USAGE_TRACKER_H_