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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_QUOTA_ENFORCER_H_
#define EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_QUOTA_ENFORCER_H_
#include <stddef.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "components/value_store/value_store.h"
namespace extensions {
// Enforces total quota and a per-setting quota in bytes, and a maximum number
// of setting keys, for a delegate storage area.
class SettingsStorageQuotaEnforcer : public value_store::ValueStore {
public:
struct Limits {
// The total quota in bytes.
size_t quota_bytes;
// The quota for each individual item in bytes.
size_t quota_bytes_per_item;
// The maximum number of items allowed.
size_t max_items;
};
SettingsStorageQuotaEnforcer(
const Limits& limits,
std::unique_ptr<value_store::ValueStore> delegate);
SettingsStorageQuotaEnforcer(const SettingsStorageQuotaEnforcer&) = delete;
SettingsStorageQuotaEnforcer& operator=(const SettingsStorageQuotaEnforcer&) =
delete;
~SettingsStorageQuotaEnforcer() override;
// ValueStore implementation.
size_t GetBytesInUse(const std::string& key) override;
size_t GetBytesInUse(const std::vector<std::string>& keys) override;
size_t GetBytesInUse() override;
ReadResult GetKeys() override;
ReadResult Get(const std::string& key) override;
ReadResult Get(const std::vector<std::string>& keys) override;
ReadResult Get() override;
WriteResult Set(WriteOptions options,
const std::string& key,
const base::Value& value) override;
WriteResult Set(WriteOptions options,
const base::Value::Dict& values) override;
WriteResult Remove(const std::string& key) override;
WriteResult Remove(const std::vector<std::string>& keys) override;
WriteResult Clear() override;
value_store::ValueStore* get_delegate_for_test() { return delegate_.get(); }
private:
template <class T>
T HandleResult(T result);
// Calculate the current usage for the database if not already calculated.
void LazyCalculateUsage();
// Frees the allocation of a setting in a record of total and per-setting
// usage.
void Free(const std::string& key);
// Limits configuration.
const Limits limits_;
// The delegate storage area.
std::unique_ptr<value_store::ValueStore> const delegate_;
// Total bytes in used by `delegate_`. Includes both key lengths and
// JSON-encoded values.
size_t used_total_;
// Have the total bytes used been calculated?
bool usage_calculated_;
// Map of item key to its size, including the key itself.
std::map<std::string, size_t> used_per_setting_;
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_STORAGE_SETTINGS_STORAGE_QUOTA_ENFORCER_H_
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