h1-mod/src/client/component/scheduler.cpp

#include <std_include.hpp>
#include "loader/component_loader.hpp"

#include "scheduler.hpp"
#include "game/game.hpp"

#include <utils/hook.hpp>
#include <utils/concurrency.hpp>
#include <utils/string.hpp>

namespace scheduler
{
	namespace
	{
		struct task
		{
			std::function<bool()> handler{};
			std::chrono::milliseconds interval{};
			std::chrono::high_resolution_clock::time_point last_call{};
		};

		using task_list = std::vector<task>;

		class task_pipeline
		{
		public:
			void add(task&& task)
			{
				new_callbacks_.access([&task](task_list& tasks)
					{
						tasks.emplace_back(std::move(task));
					});
			}

			void execute()
			{
				callbacks_.access([&](task_list& tasks)
					{
						this->merge_callbacks();

						for (auto i = tasks.begin(); i != tasks.end();)
						{
							const auto now = std::chrono::high_resolution_clock::now();
							const auto diff = now - i->last_call;

							if (diff < i->interval)
							{
								++i;
								continue;
							}

							i->last_call = now;

							const auto res = i->handler();
							if (res == cond_end)
							{
								i = tasks.erase(i);
							}
							else
							{
								++i;
							}
						}
					});
			}

		private:
			utils::concurrency::container<task_list> new_callbacks_;
			utils::concurrency::container<task_list, std::recursive_mutex> callbacks_;

			void merge_callbacks()
			{
				callbacks_.access([&](task_list& tasks)
					{
						new_callbacks_.access([&](task_list& new_tasks)
							{
								tasks.insert(tasks.end(), std::move_iterator<task_list::iterator>(new_tasks.begin()), std::move_iterator<task_list::iterator>(new_tasks.end()));
								new_tasks = {};
							});
					});
			}
		};

		volatile bool kill = false;
		std::thread thread;
		task_pipeline pipelines[pipeline::count];
		utils::hook::detour r_end_frame_hook;
		utils::hook::detour g_run_frame_hook;
		utils::hook::detour main_frame_hook;

		void execute(const pipeline type)
		{
			assert(type >= 0 && type < pipeline::count);
			pipelines[type].execute();
		}

		void r_end_frame_stub()
		{
			execute(pipeline::renderer);
			r_end_frame_hook.invoke<void>();
		}

		void server_frame_stub()
		{
			g_run_frame_hook.invoke<void>();
			execute(pipeline::server);
		}

		void main_frame_stub()
		{
			main_frame_hook.invoke<void>();
			execute(pipeline::main);
		}
	}

	void schedule(const std::function<bool()>& callback, const pipeline type,
		const std::chrono::milliseconds delay)
	{
		assert(type >= 0 && type < pipeline::count);

		task task;
		task.handler = callback;
		task.interval = delay;
		task.last_call = std::chrono::high_resolution_clock::now();

		pipelines[type].add(std::move(task));
	}

	void loop(const std::function<void()>& callback, const pipeline type,
		const std::chrono::milliseconds delay)
	{
		schedule([callback]()
			{
				callback();
				return cond_continue;
			}, type, delay);
	}

	void once(const std::function<void()>& callback, const pipeline type,
		const std::chrono::milliseconds delay)
	{
		schedule([callback]()
			{
				callback();
				return cond_end;
			}, type, delay);
	}

	class component final : public component_interface
	{
	public:
		void post_unpack() override
		{
			//thread = std::thread([]()
			//{
			//	while (!kill)
			//	{
			//		execute(pipeline::async);
			//		std::this_thread::sleep_for(10ms);
			//	}
			//});

			r_end_frame_hook.create(0x1405FE470, scheduler::r_end_frame_stub); // H1MP64[1.4]
			g_run_frame_hook.create(0x1402772D0, scheduler::server_frame_stub); // H1MP64[1.4] 
			main_frame_hook.create(0x1401CE8D0, scheduler::main_frame_stub); // H1MP64[1.4]
		}
	};
}

REGISTER_COMPONENT(scheduler::component)