limiter.hpp

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#pragma once
 
/// @file userver/server/congestion_control/limiter.hpp
/// @brief @copybrief server::congestion_control::Limiter
 
#include <optional>
#include <vector>
 
#include <userver/concurrent/variable.hpp>
#include <userver/congestion_control/limiter.hpp>
#include <userver/utils/not_null.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace server::congestion_control {
 
class Limitee {
public:
    virtual void SetLimit(std::optional<size_t> new_limit) = 0;
 
    virtual std::size_t GetLimitableHandlersCount() const = 0;
};
 
/// @brief HTTP server congestion control limiter
class Limiter final : public USERVER_NAMESPACE::congestion_control::Limiter {
public:
    void SetLimit(const USERVER_NAMESPACE::congestion_control::Limit& new_limit) override;
 
    std::size_t GetLimitableHandlersCount() const;
 
    void RegisterLimitee(Limitee& limitee);
 
private:
    concurrent::Variable<std::vector<utils::NotNull<Limitee*>>, std::mutex> limitees_;
};
 
}  // namespace server::congestion_control
 
USERVER_NAMESPACE_END