kazv-session-lock-guard.cpp
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kazv-session-lock-guard.cpp
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	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <kazv-defs.hpp>
	#include <kazv-platform.hpp>
	#include <cstring>
	#if !KAZV_IS_WINDOWS
	#include <fcntl.h>
	#include <unistd.h>
	#endif
	#include "kazv-session-lock-guard.hpp"
	#include "kazv-log.hpp"

	struct KazvSessionLockGuard::Private
	{
	std::string lockFilePath;
	int fd{-1};

	void cleanup()
	{
	#if !KAZV_IS_WINDOWS
	qCDebug(kazvLog) << "KazvSessionLockGuard::Private::cleanup" << QString::fromStdString(lockFilePath);
	if (fd != -1) {
	qCDebug(kazvLog) << "unlocking session";
	lockf(fd, F_ULOCK, 0);
	close(fd);
	fd = -1;
	}
	#endif
	}

	Private(const std::filesystem::path &sessionDir)
	: lockFilePath((sessionDir / "lock").string())
	{
	#if !KAZV_IS_WINDOWS
	qCDebug(kazvLog) << "KazvSessionLockGuard::Private::Private" << QString::fromStdString(lockFilePath);
	fd = open(lockFilePath.data(), O_RDWR \| O_CREAT, S_IRUSR \| S_IWUSR);
	if (fd == -1) {
	throw std::runtime_error{std::string("Cannot open lock file: ") + std::strerror(errno)};
	}

	auto res = lockf(fd, F_TLOCK, 0);
	if (res == -1) {
	cleanup();
	throw std::runtime_error{std::string("Cannot grab lock file: ") + std::strerror(errno)};
	}
	#endif
	}

	~Private()
	{
	cleanup();
	}
	};

	KazvSessionLockGuard::KazvSessionLockGuard(const std::filesystem::path &sessionDir)
	: m_d(std::make_unique<Private>(sessionDir))
	{
	}

	KazvSessionLockGuard::~KazvSessionLockGuard() = default;