salmanoff/smocore/deviceManager/deviceReattacher.cpp

#include <config.h>
#include <iostream>
#include <functional>
#include <componentThread.h>
#include <adapters/boostAsio/deadlineTimerAReq.h>
#include <deviceManager/deviceReattacher.h>
#include <deviceManager/deviceManager.h>
#include <spinscale/co/nonViralCompletion.h>

namespace smo {
namespace device {

DeviceReattacher::DeviceReattacher(
	DeviceManager& parent, std::shared_ptr<sscl::ComponentThread> ioThread)
:	parent(parent),
ioThread(ioThread), daemonTimer(ioThread->getIoContext())
{
	/**	EXPLANATION:
	 * deviceReattacherCDaemon is a dynamic posting non-viral coroutine: start()
	 * passes ExplicitPostTarget{ioThread->getIoContext()} so the daemon body
	 * always runs on ioThread. daemonTimer is reused each loop iteration.
	 */
}

sscl::co::DynamicNonViralPostingInvoker
DeviceReattacher::deviceReattacherCDaemon(
	[[maybe_unused]] sscl::co::ExplicitPostTarget postTarget,
	[[maybe_unused]] std::exception_ptr &exceptionPtr,
	[[maybe_unused]] std::function<void()> callback,
	sscl::SyncCancelerForAsyncWork &canceler)
{
	boost::asio::io_context &timerIoContext =
		sscl::ComponentThread::getSelf()->getIoContext();
	const auto periodMs = boost::posix_time::milliseconds(
		CONFIG_MRNTT_DEVMGR_REATTACHER_PERIOD_MS);

	while (!canceler.isCancellationRequested())
	{
		const bool expiredNormally = co_await
			adapters::boostAsio::getDeadlineTimerAReqAwaiter(
				timerIoContext, daemonTimer, periodMs);

		if (!expiredNormally) {
			break;
		}

		co_await parent.attachAllUnattachedDevicesFromKnownListCReq();
	}

	co_return;
}

void DeviceReattacher::start()
{
	taskNursery.openAdmission();
	taskNursery.launch(
		[this](sscl::co::NonViralTaskNursery::Slot::Lease &lease)
		{
			return deviceReattacherCDaemon(
				sscl::co::ExplicitPostTarget{ioThread->getIoContext()},
				lease.getExceptionStorage(),
				lease.getCallerLambda(),
				lease.getSyncCanceler());
		},
		[](std::exception_ptr &exceptionPtr)
		{
			sscl::co::NonViralCompletion nvc(exceptionPtr);
			if (nvc.hasException())
			{
				try {
					nvc.checkAndRethrowException();
				} catch (const std::exception &e) {
					std::cerr << "DeviceReattacher: "
						<< e.what() << std::endl;
				}
			}
		});
}

void DeviceReattacher::stop()
{
	daemonTimer.cancel();
	taskNursery.requestCancelOnAll();
	taskNursery.closeAdmission();
	taskNursery.syncAwaitAllSettlements(ioThread->getIoContext());
}

} // namespace device
} // namespace smo