transmission/libtransmission/session-alt-speeds.h

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// This file Copyright © 2022-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#pragma once
#include <bitset>
#include <ctime> // for time_t
#include <optional>
#include "transmission.h" // for TR_SCHED_ALL
#include "quark.h"
struct tr_variant;
#define ALT_SPEEDS_FIELDS(V) \
V(TR_KEY_alt_speed_up, speed_up_kilobytes_per_second_, size_t, 50U, "") \
V(TR_KEY_alt_speed_down, speed_down_kilobytes_per_second_, size_t, 50U, "") \
V(TR_KEY_alt_speed_time_enabled, scheduler_enabled_, bool, false, "whether alt speeds toggle on and off on schedule") \
V(TR_KEY_alt_speed_time_day, use_on_these_weekdays_, size_t, TR_SCHED_ALL, "days of the week") \
V(TR_KEY_alt_speed_time_begin, minute_begin_, size_t, 540U, "minutes past midnight; 9AM") \
V(TR_KEY_alt_speed_time_end, minute_end_, size_t, 1020U, "minutes past midnight; 5PM")
/** Manages alternate speed limits and a scheduler to auto-toggle them. */
class tr_session_alt_speeds
{
public:
enum class ChangeReason
{
User,
Scheduler
};
class Mediator
{
public:
virtual ~Mediator() noexcept = default;
using ChangeReason = tr_session_alt_speeds::ChangeReason;
virtual void isActiveChanged(bool is_active, ChangeReason reason) = 0;
[[nodiscard]] virtual time_t time() = 0;
};
constexpr explicit tr_session_alt_speeds(Mediator& mediator) noexcept
: mediator_{ mediator }
{
}
void load(tr_variant* src);
void save(tr_variant* tgt) const;
static void defaultSettings(tr_variant* tgt);
[[nodiscard]] constexpr bool isActive() const noexcept
{
return is_active_;
}
void checkScheduler();
void setSchedulerEnabled(bool enabled)
{
scheduler_enabled_ = enabled;
updateScheduler();
}
// return true iff the scheduler will turn alt speeds on/off
[[nodiscard]] constexpr auto isSchedulerEnabled() const noexcept
{
return scheduler_enabled_;
}
void setStartMinute(size_t minute)
{
minute_begin_ = minute;
updateScheduler();
}
[[nodiscard]] constexpr auto startMinute() const noexcept
{
return minute_begin_;
}
void setEndMinute(size_t minute)
{
minute_end_ = minute;
updateScheduler();
}
[[nodiscard]] constexpr auto endMinute() const noexcept
{
return minute_end_;
}
void setWeekdays(tr_sched_day days)
{
use_on_these_weekdays_ = days;
updateScheduler();
}
[[nodiscard]] constexpr tr_sched_day weekdays() const noexcept
{
return static_cast<tr_sched_day>(use_on_these_weekdays_);
}
[[nodiscard]] constexpr auto limitKBps(tr_direction dir) const noexcept
{
return dir == TR_DOWN ? speed_down_kilobytes_per_second_ : speed_up_kilobytes_per_second_;
}
constexpr void setLimitKBps(tr_direction dir, size_t limit) noexcept
{
if (dir == TR_DOWN)
{
speed_down_kilobytes_per_second_ = limit;
}
else
{
speed_up_kilobytes_per_second_ = limit;
}
}
void setActive(bool active, ChangeReason reason);
private:
Mediator& mediator_;
void updateScheduler();
void updateMinutes();
// whether `time` hits in one of the `minutes_` that is true
[[nodiscard]] bool isActiveMinute(time_t time) const noexcept;
static auto constexpr MinutesPerHour = int{ 60 };
static auto constexpr MinutesPerDay = int{ MinutesPerHour * 24 };
static auto constexpr MinutesPerWeek = int{ MinutesPerDay * 7 };
// are alt speeds active right now?
bool is_active_ = false;
// bitfield of all the minutes in a week.
// Each bit's value indicates whether the scheduler wants
// alt speeds on or off at that given minute.
std::bitset<10080> minutes_{};
// recent change that was made by the scheduler
std::optional<bool> scheduler_set_is_active_to_;
#define V(key, name, type, default_value, comment) type name = type{ default_value };
ALT_SPEEDS_FIELDS(V)
#undef V
};