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#pragma once
#include <Access/IAccessEntity.h>
#include <Access/Common/QuotaDefs.h>
#include <Access/RolesOrUsersSet.h>
#include <chrono>
namespace DB
{
/** Quota for resources consumption for specific interval.
* Used to limit resource usage by user.
* Quota is applied "softly" - could be slightly exceed, because it is checked usually only on each block of processed data.
* Accumulated values are not persisted and are lost on server restart.
* Quota is local to server,
* but for distributed queries, accumulated values for read rows and bytes
* are collected from all participating servers and accumulated locally.
*/
struct Quota : public IAccessEntity
{
/// Amount of resources available to consume for each duration.
struct Limits
{
std::optional<QuotaValue> max[static_cast<size_t>(QuotaType::MAX)];
std::chrono::seconds duration = std::chrono::seconds::zero();
/// Intervals can be randomized (to avoid DoS if intervals for many users end at one time).
bool randomize_interval = false;
friend bool operator ==(const Limits & lhs, const Limits & rhs);
friend bool operator !=(const Limits & lhs, const Limits & rhs) { return !(lhs == rhs); }
};
std::vector<Limits> all_limits;
/// Key to share quota consumption.
/// Users with the same key share the same amount of resource.
QuotaKeyType key_type = QuotaKeyType::NONE;
/// Which roles or users should use this quota.
RolesOrUsersSet to_roles;
bool equal(const IAccessEntity & other) const override;
std::shared_ptr<IAccessEntity> clone() const override { return cloneImpl<Quota>(); }
static constexpr const auto TYPE = AccessEntityType::QUOTA;
AccessEntityType getType() const override { return TYPE; }
std::vector<UUID> findDependencies() const override;
void replaceDependencies(const std::unordered_map<UUID, UUID> & old_to_new_ids) override;
bool isBackupAllowed() const override { return true; }
};
using QuotaPtr = std::shared_ptr<const Quota>;
}
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