stress.hpp

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#pragma once
 
/// @file userver/utest/stress.hpp
/// @brief @copybrief utest::StressLoop
 
#include <chrono>
 
#include <userver/engine/deadline.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace utest {
 
/// @brief Helper for stress tests for watching for
/// "OK, we have been running for enough time, let's stop" event.
///
/// Example:
/// @code
/// for (auto _: utest::StressLoop()) {
///     ...
/// }
/// @endcode
class StressLoop {
public:
    struct Iterator {
        StressLoop& loop;
 
        struct Value {
            ~Value() {
                (void)0;  // force non-trivial destructor
            }
        };
 
        void operator++() {}
        Value operator*() { return {}; }
        bool operator==(const Iterator&) const { return loop.ShouldStop(); }
        bool operator!=(const Iterator&) const { return !loop.ShouldStop(); }
    };
 
    Iterator begin() { return {*this}; }
 
    Iterator end() { return {*this}; }
 
    bool ShouldStop() const { return deadline_.IsReached(); }
 
private:
    static constexpr std::chrono::seconds kMaxStressTestWaitTime{30};
 
    engine::Deadline deadline_{engine::Deadline::FromDuration(kMaxStressTestWaitTime)};
};
 
}  // namespace utest
 
USERVER_NAMESPACE_END