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#include <library/cpp/testing/gtest/gtest.h>
#include <library/cpp/testing/gtest_extensions/gtest_extensions.h>
#include <library/cpp/threading/future/future.h>
#include <library/cpp/threading/future/core/coroutine_traits.h>
#include <util/generic/vector.h>
#include <util/generic/scope.h>
#include <util/system/platform.h>
TEST(TestFutureTraits, Simple) {
TVector<TString> result;
auto coroutine1 = [&result]() -> NThreading::TFuture<size_t> {
result.push_back("coroutine1");
co_return 1;
};
NThreading::TPromise<size_t> coroutine2SuspendPromise = NThreading::NewPromise<size_t>();
auto coroutine2 = [&result, coroutine2SuspendFuture = coroutine2SuspendPromise.GetFuture()]() -> NThreading::TFuture<size_t> {
result.push_back("coroutine2");
result.push_back("pre_coroutine2_suspend_future");
size_t futureResult = co_await coroutine2SuspendFuture;
result.push_back("post_coroutine2_suspend_future");
co_return 2 + futureResult;
};
auto coroutineAll = [&]() -> NThreading::TFuture<size_t> {
Y_DEFER {
result.push_back("coroutine_all_destroy");
};
result.push_back("pre_coroutine1");
size_t coroutine1Res = co_await coroutine1();
result.push_back("post_coroutine1");
result.push_back("pre_coroutine2");
size_t coroutine2Res = co_await coroutine2();
result.push_back("post_coroutine2");
co_return coroutine1Res + coroutine2Res;
};
NThreading::TFuture<size_t> coroutineAllFuture = coroutineAll();
EXPECT_FALSE(coroutineAllFuture.HasValue());
EXPECT_FALSE(coroutineAllFuture.HasException());
EXPECT_THAT(
result,
::testing::ContainerEq(
TVector<TString>({
"pre_coroutine1",
"coroutine1",
"post_coroutine1",
"pre_coroutine2",
"coroutine2",
"pre_coroutine2_suspend_future"
})
)
);
coroutine2SuspendPromise.SetValue(3u);
EXPECT_TRUE(coroutineAllFuture.HasValue());
EXPECT_EQ(coroutineAllFuture.GetValue(), 6u);
EXPECT_THAT(
result,
::testing::ContainerEq(
TVector<TString>({
"pre_coroutine1",
"coroutine1",
"post_coroutine1",
"pre_coroutine2",
"coroutine2",
"pre_coroutine2_suspend_future",
"post_coroutine2_suspend_future",
"post_coroutine2",
"coroutine_all_destroy"
})
)
);
}
TEST(TestFutureTraits, Exception) {
TVector<TString> result;
auto coroutine1 = [&result]() -> NThreading::TFuture<size_t> {
result.push_back("coroutine1");
co_return 1;
};
auto coroutine2 = [&result]() -> NThreading::TFuture<size_t> {
result.push_back("coroutine2");
ythrow yexception() << "coroutine2 exception";
};
auto coroutineAll = [&]() -> NThreading::TFuture<size_t> {
Y_DEFER {
result.push_back("coroutine_all_destroy");
};
result.push_back("pre_coroutine1");
size_t coroutine1Res = co_await coroutine1();
result.push_back("post_coroutine1");
result.push_back("pre_coroutine2");
size_t coroutine2Res = co_await coroutine2();
result.push_back("post_coroutine2");
co_return coroutine1Res + coroutine2Res;
};
EXPECT_THROW_MESSAGE_HAS_SUBSTR(
coroutineAll().GetValueSync(),
yexception,
"coroutine2 exception"
);
EXPECT_THAT(
result,
::testing::ContainerEq(
TVector<TString>({
"pre_coroutine1",
"coroutine1",
"post_coroutine1",
"pre_coroutine2",
"coroutine2",
"coroutine_all_destroy"
})
)
);
}
TEST(TestFutureTraits, CrashOnExceptionInCoroutineHandlerResume) {
EXPECT_DEATH(
{
struct TBadPromise;
struct TBadCoroutine : std::coroutine_handle<TBadPromise> {
using promise_type = TBadPromise;
};
struct TBadPromise {
TBadCoroutine get_return_object() {
return {TBadCoroutine::from_promise(*this)};
}
std::suspend_never initial_suspend() noexcept {
return {};
}
std::suspend_never final_suspend() noexcept {
return {};
}
void return_void() {
}
void unhandled_exception() {
throw;
}
};
auto badCoroutine = []() -> TBadCoroutine {
ythrow yexception() << "bad coroutine exception";
};
// Sanity check
EXPECT_THROW_MESSAGE_HAS_SUBSTR(
badCoroutine(),
yexception,
"bad coroutine exception"
);
NThreading::TPromise<void> promise = NThreading::NewPromise<void>();
auto badCoroutineWithFutureAwait = [future = promise.GetFuture()]() -> TBadCoroutine {
co_await future;
ythrow yexception() << "bad coroutine with future await exception";
};
badCoroutineWithFutureAwait();
promise.SetValue();
},
#if defined(_win_)
".*"
#else
"bad coroutine with future await exception"
#endif
);
}
TEST(ExtractingFutureAwaitable, Simple) {
NThreading::TPromise<THolder<size_t>> suspendPromise = NThreading::NewPromise<THolder<size_t>>();
auto coro = [](NThreading::TFuture<THolder<size_t>> future) -> NThreading::TFuture<THolder<size_t>> {
auto value = co_await NThreading::AsExtractingAwaitable(std::move(future));
co_return value;
};
NThreading::TFuture<THolder<size_t>> getHolder = coro(suspendPromise.GetFuture());
EXPECT_FALSE(getHolder.HasValue());
EXPECT_FALSE(getHolder.HasException());
suspendPromise.SetValue(MakeHolder<size_t>(42));
EXPECT_TRUE(getHolder.HasValue());
auto holder = getHolder.ExtractValue();
ASSERT_NE(holder, nullptr);
EXPECT_EQ(*holder, 42u);
}
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