1 // Copyright 2014 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 EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_QUOTA_ENFORCER_H_ 6 #define EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_QUOTA_ENFORCER_H_ 7 8 #include "base/compiler_specific.h" 9 #include "base/memory/weak_ptr.h" 10 #include "extensions/browser/value_store/value_store.h" 11 12 namespace extensions { 13 14 // Enforces total quota and a per-setting quota in bytes, and a maximum number 15 // of setting keys, for a delegate storage area. 16 class SettingsStorageQuotaEnforcer : public ValueStore { 17 public: 18 struct Limits { 19 // The total quota in bytes. 20 size_t quota_bytes; 21 22 // The quota for each individual item in bytes. 23 size_t quota_bytes_per_item; 24 25 // The maximum number of items allowed. 26 size_t max_items; 27 }; 28 29 SettingsStorageQuotaEnforcer(const Limits& limits, ValueStore* delegate); 30 31 virtual ~SettingsStorageQuotaEnforcer(); 32 33 // ValueStore implementation. 34 virtual size_t GetBytesInUse(const std::string& key) OVERRIDE; 35 virtual size_t GetBytesInUse(const std::vector<std::string>& keys) OVERRIDE; 36 virtual size_t GetBytesInUse() OVERRIDE; 37 virtual ReadResult Get(const std::string& key) OVERRIDE; 38 virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE; 39 virtual ReadResult Get() OVERRIDE; 40 virtual WriteResult Set( 41 WriteOptions options, 42 const std::string& key, 43 const base::Value& value) OVERRIDE; 44 virtual WriteResult Set( 45 WriteOptions options, const base::DictionaryValue& values) OVERRIDE; 46 virtual WriteResult Remove(const std::string& key) OVERRIDE; 47 virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE; 48 virtual WriteResult Clear() OVERRIDE; 49 virtual bool Restore() OVERRIDE; 50 virtual bool RestoreKey(const std::string& key) OVERRIDE; 51 get_delegate_for_test()52 ValueStore* get_delegate_for_test() { return delegate_.get(); } 53 54 private: 55 // Calculate the current usage for the database. 56 void CalculateUsage(); 57 58 // Limits configuration. 59 const Limits limits_; 60 61 // The delegate storage area. 62 scoped_ptr<ValueStore> const delegate_; 63 64 // Total bytes in used by |delegate_|. Includes both key lengths and 65 // JSON-encoded values. 66 size_t used_total_; 67 68 // Map of item key to its size, including the key itself. 69 std::map<std::string, size_t> used_per_setting_; 70 71 DISALLOW_COPY_AND_ASSIGN(SettingsStorageQuotaEnforcer); 72 }; 73 74 } // namespace extensions 75 76 #endif // EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_QUOTA_ENFORCER_H_ 77