salmanoff/smocore/include/cpsBoundary/stimBuffDeviceAReq.h

#ifndef STIM_BUFF_DEVICE_AREQ_H
#define STIM_BUFF_DEVICE_AREQ_H

#include <atomic>
#include <coroutine>
#include <memory>

#include <boost/asio/io_service.hpp>
#include <boost/asio/post.hpp>
#include <spinscale/cps/callback.h>
#include <stimBuffApis/stimBuffApiLib.h>
#include <user/deviceAttachmentSpec.h>
#include <user/senseApiDesc.h>

namespace smo {
namespace cpsBoundary {

struct StimBuffDeviceOpResult
{
	bool success = false;
	std::shared_ptr<device::DeviceAttachmentSpec> deviceSpec;
};

struct AttachStimBuffDeviceAReq
{
	struct AsyncState
	{
		std::atomic<bool> settled{false};
		StimBuffDeviceOpResult result;
		std::coroutine_handle<> callerSchedHandle;
	};

	AttachStimBuffDeviceAReq(
		const std::shared_ptr<device::DeviceAttachmentSpec> &spec,
		stim_buff::StimBuffApiLib &lib,
		const std::shared_ptr<sscl::ComponentThread> &threadForAttachment,
		boost::asio::io_service &resumeIoService)
	: asyncState(std::make_shared<AsyncState>()),
	resumeIoService(resumeIoService)
	{
		lib.stimBuffApiDesc.sal_mgmt_libOps.attachDeviceReq(
			spec, threadForAttachment,
			{nullptr,
				[asyncState = asyncState, &resumeIoService = resumeIoService](
					bool success,
					std::shared_ptr<device::DeviceAttachmentSpec> deviceSpec)
				{
					asyncState->result = StimBuffDeviceOpResult{
						success, deviceSpec};

					asyncState->settled.store(
						true, std::memory_order_release);

					std::coroutine_handle<> handle =
						asyncState->callerSchedHandle;

					if (!handle) {
						return;
					}

					boost::asio::post(
						resumeIoService,
						[handle]() { handle.resume(); });
				}});
	}

	bool await_ready() const noexcept
	{
		return asyncState->settled.load(std::memory_order_acquire);
	}

	bool await_suspend(std::coroutine_handle<> callerSchedHandle) noexcept
	{
		if (asyncState->settled.load(std::memory_order_acquire)) {
			return false;
		}

		asyncState->callerSchedHandle = callerSchedHandle;
		return true;
	}

	StimBuffDeviceOpResult await_resume() noexcept
	{
		return asyncState->result;
	}

	std::shared_ptr<AsyncState> asyncState;
	boost::asio::io_service &resumeIoService;
};

struct DetachStimBuffDeviceAReq
{
	struct AsyncState
	{
		std::atomic<bool> settled{false};
		StimBuffDeviceOpResult result;
		std::coroutine_handle<> callerSchedHandle;
	};

	DetachStimBuffDeviceAReq(
		const std::shared_ptr<device::DeviceAttachmentSpec> &spec,
		stim_buff::StimBuffApiLib &lib,
		boost::asio::io_service &resumeIoService)
	: asyncState(std::make_shared<AsyncState>()),
	resumeIoService(resumeIoService)
	{
		lib.stimBuffApiDesc.sal_mgmt_libOps.detachDeviceReq(
			spec,
			{nullptr,
				[asyncState = asyncState, &resumeIoService = resumeIoService](
					bool success,
					std::shared_ptr<device::DeviceAttachmentSpec> deviceSpec)
				{
					asyncState->result = StimBuffDeviceOpResult{
						success, deviceSpec};

					asyncState->settled.store(
						true, std::memory_order_release);

					std::coroutine_handle<> handle =
						asyncState->callerSchedHandle;

					if (!handle) {
						return;
					}

					boost::asio::post(
						resumeIoService,
						[handle]() { handle.resume(); });
				}});
	}

	bool await_ready() const noexcept
	{
		return asyncState->settled.load(std::memory_order_acquire);
	}

	bool await_suspend(std::coroutine_handle<> callerSchedHandle) noexcept
	{
		if (asyncState->settled.load(std::memory_order_acquire)) {
			return false;
		}

		asyncState->callerSchedHandle = callerSchedHandle;
		return true;
	}

	StimBuffDeviceOpResult await_resume() noexcept
	{
		return asyncState->result;
	}

	std::shared_ptr<AsyncState> asyncState;
	boost::asio::io_service &resumeIoService;
};

} // namespace cpsBoundary
} // namespace smo

#endif // STIM_BUFF_DEVICE_AREQ_H