transmission/tests/libtransmission/timer-test.cc

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// This file Copyright (C) 2022 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.
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#include <chrono>
#include <cstddef> // size_t
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#include <event2/event.h>
#include <libtransmission/timer.h>
#include <libtransmission/timer-ev.h>
#include <libtransmission/utils-ev.h>
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#include "gtest/gtest.h"
#include "test-fixtures.h"
namespace libtransmission::test
{
class TimerTest : public ::testing::Test
{
protected:
// setup + teardown to manage an event_base
void SetUp() override
{
::testing::Test::SetUp();
evbase_.reset(event_base_new());
}
void TearDown() override
{
evbase_.reset();
::testing::Test::TearDown();
}
static auto constexpr AsMSec = [](auto val)
{
return std::chrono::duration_cast<std::chrono::milliseconds>(val);
};
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void sleepMsec(std::chrono::milliseconds msec)
{
EXPECT_FALSE(waitFor(
evbase_.get(),
[]() { return false; },
msec));
}
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static void expectTime(
std::chrono::milliseconds expected,
std::chrono::milliseconds actual,
std::chrono::milliseconds allowed_deviation)
{
auto const lower_bound = expected - allowed_deviation;
EXPECT_LT(lower_bound, actual) << "lower_bound:" << lower_bound.count() << " actual:" << actual.count();
auto const upper_bound = expected + allowed_deviation;
EXPECT_LT(actual, upper_bound) << "actual:" << actual.count() << " upper_bound:" << upper_bound.count();
}
// This checks that `actual` is in the bounds of [expected/2 ... expected*1.5]
// to confirm that the timer didn't kick too close to the previous or next interval.
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static void expectInterval(std::chrono::milliseconds expected, std::chrono::milliseconds actual)
{
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expectTime(expected, actual, expected / 2);
}
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[[nodiscard]] static auto currentTime()
{
return std::chrono::steady_clock::now();
}
evhelpers::evbase_unique_ptr evbase_;
};
TEST_F(TimerTest, canInstantiate)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
}
TEST_F(TimerTest, singleShotCallsCallback)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto called = false;
auto callback = [&called]()
{
called = true;
};
timer->set_callback(callback);
static auto constexpr Interval = 100ms;
timer->start_single_shot(Interval);
waitFor(evbase_.get(), [&called] { return called; });
EXPECT_TRUE(called);
}
TEST_F(TimerTest, repeatingCallsCallback)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto called = false;
auto callback = [&called]()
{
called = true;
};
timer->set_callback(callback);
static auto constexpr Interval = 100ms;
timer->start_repeating(Interval);
waitFor(evbase_.get(), [&called] { return called; });
EXPECT_TRUE(called);
}
TEST_F(TimerTest, singleShotHonorsInterval)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto called = false;
auto callback = [&called]()
{
called = true;
};
timer->set_callback(callback);
// run a single-shot timer
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auto const begin_time = currentTime();
static auto constexpr Interval = 100ms;
timer->start_single_shot(Interval);
EXPECT_FALSE(timer->is_repeating());
EXPECT_EQ(Interval, timer->interval());
waitFor(evbase_.get(), [&called] { return called; });
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auto const end_time = currentTime();
// confirm that it kicked at the right interval
EXPECT_TRUE(called);
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expectInterval(Interval, AsMSec(end_time - begin_time));
}
TEST_F(TimerTest, repeatingHonorsInterval)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
// start a repeating timer
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auto const begin_time = currentTime();
static auto constexpr Interval = 100ms;
static auto constexpr DesiredLoops = 3;
timer->start_repeating(Interval);
EXPECT_TRUE(timer->is_repeating());
EXPECT_EQ(Interval, timer->interval());
waitFor(evbase_.get(), [&n_calls] { return n_calls >= DesiredLoops; });
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auto const end_time = currentTime();
// confirm that it kicked the right number of times
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expectInterval(Interval * DesiredLoops, AsMSec(end_time - begin_time));
EXPECT_EQ(DesiredLoops, n_calls);
}
TEST_F(TimerTest, restartWithDifferentInterval)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
auto const test = [this, &n_calls, &timer](auto interval)
{
auto const next = n_calls + 1;
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auto const begin_time = currentTime();
timer->start_single_shot(interval);
waitFor(evbase_.get(), [&n_calls, next]() { return n_calls >= next; });
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auto const end_time = currentTime();
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expectInterval(interval, AsMSec(end_time - begin_time));
};
test(200ms);
test(400ms);
test(200ms);
}
TEST_F(TimerTest, DISABLED_restartWithSameInterval)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
auto const test = [this, &n_calls, &timer](auto interval)
{
auto const next = n_calls + 1;
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auto const begin_time = currentTime();
timer->start_single_shot(interval);
waitFor(evbase_.get(), [&n_calls, next]() { return n_calls >= next; });
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auto const end_time = currentTime();
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expectInterval(interval, AsMSec(end_time - begin_time));
};
test(timer->interval());
test(timer->interval());
test(timer->interval());
}
TEST_F(TimerTest, DISABLED_repeatingThenSingleShot)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
// start a repeating timer and confirm that it's running
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auto begin_time = currentTime();
static auto constexpr RepeatingInterval = 100ms;
static auto constexpr DesiredLoops = 2;
timer->start_repeating(RepeatingInterval);
EXPECT_EQ(RepeatingInterval, timer->interval());
EXPECT_TRUE(timer->is_repeating());
waitFor(evbase_.get(), [&n_calls]() { return n_calls >= DesiredLoops; });
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auto end_time = currentTime();
expectTime(RepeatingInterval * DesiredLoops, AsMSec(end_time - begin_time), RepeatingInterval / 2);
// now restart it as a single shot
auto const baseline = n_calls;
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begin_time = currentTime();
static auto constexpr SingleShotInterval = 200ms;
timer->start_single_shot(SingleShotInterval);
EXPECT_EQ(SingleShotInterval, timer->interval());
EXPECT_FALSE(timer->is_repeating());
waitFor(evbase_.get(), [&n_calls]() { return n_calls >= DesiredLoops + 1; });
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end_time = currentTime();
// confirm that the single shot interval was honored
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expectInterval(SingleShotInterval, AsMSec(end_time - begin_time));
// confirm that the timer only kicks once, since it was converted into single-shot
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sleepMsec(SingleShotInterval * 3);
EXPECT_EQ(baseline + 1, n_calls);
}
TEST_F(TimerTest, DISABLED_singleShotStop)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
// start a single-shot timer
static auto constexpr Interval = 200ms;
timer->start_single_shot(Interval);
EXPECT_EQ(Interval, timer->interval());
EXPECT_FALSE(timer->is_repeating());
// wait half the interval, then stop the timer
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sleepMsec(Interval / 2);
EXPECT_EQ(0U, n_calls);
timer->stop();
// wait until the timer has gone past.
// since we stopped it, callback should not have been called.
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sleepMsec(Interval);
EXPECT_EQ(0U, n_calls);
}
TEST_F(TimerTest, repeatingStop)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
// start a repeating timer
static auto constexpr Interval = 200ms;
timer->start_repeating(Interval);
EXPECT_EQ(Interval, timer->interval());
EXPECT_TRUE(timer->is_repeating());
// wait half the interval, then stop the timer
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sleepMsec(Interval / 2);
EXPECT_EQ(0U, n_calls);
timer->stop();
// wait until the timer has gone past.
// since we stopped it, callback should not have been called.
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sleepMsec(Interval);
EXPECT_EQ(0U, n_calls);
}
TEST_F(TimerTest, destroyedTimersStop)
{
auto timer_maker = EvTimerMaker{ evbase_.get() };
auto timer = timer_maker.create();
EXPECT_TRUE(timer);
auto n_calls = size_t{ 0U };
auto callback = [&n_calls]()
{
++n_calls;
};
timer->set_callback(callback);
// start a repeating timer
static auto constexpr Interval = 200ms;
timer->start_repeating(Interval);
EXPECT_EQ(Interval, timer->interval());
EXPECT_TRUE(timer->is_repeating());
// wait half the interval, then destroy the timer
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sleepMsec(Interval / 2);
EXPECT_EQ(0U, n_calls);
timer.reset();
// wait until the timer has gone past.
// since we destroyed it, callback should not have been called.
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sleepMsec(Interval);
EXPECT_EQ(0U, n_calls);
}
} // namespace libtransmission::test