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#pragma once
#include <Access/EnabledQuota.h>
#include <base/scope_guard.h>
#include <memory>
#include <mutex>
#include <map>
#include <unordered_map>
namespace DB
{
class AccessControl;
struct Quota;
using QuotaPtr = std::shared_ptr<const Quota>;
struct RolesOrUsersSet;
/// Stores information how much amount of resources have been consumed and how much are left.
class QuotaCache
{
public:
explicit QuotaCache(const AccessControl & access_control_);
~QuotaCache();
std::shared_ptr<const EnabledQuota> getEnabledQuota(
const UUID & user_id,
const String & user_name,
const boost::container::flat_set<UUID> & enabled_roles,
const Poco::Net::IPAddress & address,
const String & forwarded_address,
const String & client_key);
std::vector<QuotaUsage> getAllQuotasUsage() const;
private:
using Interval = EnabledQuota::Interval;
using Intervals = EnabledQuota::Intervals;
struct QuotaInfo
{
QuotaInfo(const QuotaPtr & quota_, const UUID & quota_id_) { setQuota(quota_, quota_id_); }
void setQuota(const QuotaPtr & quota_, const UUID & quota_id_);
String calculateKey(const EnabledQuota & enabled_quota) const;
boost::shared_ptr<const Intervals> getOrBuildIntervals(const String & key);
boost::shared_ptr<const Intervals> rebuildIntervals(const String & key, std::chrono::system_clock::time_point current_time);
void rebuildAllIntervals();
QuotaPtr quota;
UUID quota_id;
const RolesOrUsersSet * roles = nullptr;
std::unordered_map<String /* quota key */, boost::shared_ptr<const Intervals>> key_to_intervals;
};
void ensureAllQuotasRead();
void quotaAddedOrChanged(const UUID & quota_id, const std::shared_ptr<const Quota> & new_quota);
void quotaRemoved(const UUID & quota_id);
void chooseQuotaToConsume();
void chooseQuotaToConsumeFor(EnabledQuota & enabled_quota);
const AccessControl & access_control;
mutable std::mutex mutex;
std::unordered_map<UUID /* quota id */, QuotaInfo> all_quotas;
bool all_quotas_read = false;
scope_guard subscription;
std::map<EnabledQuota::Params, std::weak_ptr<EnabledQuota>> enabled_quotas;
};
}
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