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/*
* Copyright 2024 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef TEST_WAIT_UNTIL_H_
#define TEST_WAIT_UNTIL_H_
#include <string>
#include <variant>
#include "api/rtc_error.h"
#include "api/test/time_controller.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/checks.h"
#include "rtc_base/fake_clock.h"
#include "rtc_base/thread.h"
#include "system_wrappers/include/clock.h"
#include "test/gmock.h"
#include "test/wait_until_internal.h" // IWYU pragma: private
namespace webrtc {
using ClockVariant = std::variant<std::monostate,
SimulatedClock*,
FakeClock*,
ThreadProcessingFakeClock*,
TimeController*>;
namespace wait_until_internal {
Timestamp GetTimeFromClockVariant(const ClockVariant& clock);
void AdvanceTimeOnClockVariant(ClockVariant& clock, TimeDelta delta);
} // namespace wait_until_internal
struct WaitUntilSettings {
// The maximum time to wait for the condition to be met.
TimeDelta timeout = TimeDelta::Seconds(5);
// The interval between polling the condition.
TimeDelta polling_interval = TimeDelta::Millis(1);
// The clock to use for timing.
ClockVariant clock = std::monostate();
// Name of the result to be used in the error message.
std::string result_name = "result";
};
// Runs a function `fn`, which returns a result, until `matcher` matches the
// result.
//
// The function is called repeatedly until the result matches the matcher or the
// timeout is reached. If the matcher matches the result, the result is
// returned. Otherwise, an error is returned.
//
// Example:
//
// int counter = 0;
// RTCErrorOr<int> result = Waituntil([&] { return ++counter; }, Eq(3))
// EXPECT_THAT(result, IsOkAndHolds(3));
template <typename Fn, typename Matcher>
[[nodiscard]] auto WaitUntil(const Fn& fn,
Matcher matcher,
WaitUntilSettings settings = {})
-> RTCErrorOr<decltype(fn())> {
if (std::holds_alternative<std::monostate>(settings.clock)) {
RTC_CHECK(Thread::Current()) << "A current thread is required. An "
"webrtc::AutoThread can work for tests.";
}
Timestamp start =
wait_until_internal::GetTimeFromClockVariant(settings.clock);
do {
auto result = fn();
if (::testing::Value(result, matcher)) {
return result;
}
wait_until_internal::AdvanceTimeOnClockVariant(settings.clock,
settings.polling_interval);
} while (wait_until_internal::GetTimeFromClockVariant(settings.clock) <
start + settings.timeout);
// One more try after the last sleep. This failure will contain the error
// message.
auto result = fn();
::testing::StringMatchResultListener listener;
if (wait_until_internal::ExplainMatchResult(matcher, result, &listener,
settings.result_name)) {
return result;
}
return RTCError(RTCErrorType::INTERNAL_ERROR, listener.str());
}
} // namespace webrtc
#endif // TEST_WAIT_UNTIL_H_
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