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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright OpenBMC Authors
#pragma once
#include "bmcweb_config.h"
#include "io_context_singleton.hpp"
#include "logging.hpp"
#include <systemd/sd-daemon.h>
#include <boost/asio/steady_timer.hpp>
#include <boost/system/error_code.hpp>
#include <chrono>
#include <cstdint>
#include <functional>
#include <ratio>
namespace bmcweb
{
class ServiceWatchdog
{
public:
ServiceWatchdog() : timer(getIoContext())
{
uint64_t usecondTimeout = 0;
if (sd_watchdog_enabled(0, &usecondTimeout) <= 0)
{
if (BMCWEB_WATCHDOG_TIMEOUT_SECONDS > 0)
{
BMCWEB_LOG_WARNING(
"Watchdog timeout was enabled at compile time, but disabled at runtime");
}
return;
}
// Pet the watchdog N times faster than required.
uint64_t petRatio = 4;
watchdogTime = std::chrono::duration<uint64_t, std::micro>(
usecondTimeout / petRatio);
startTimer();
}
private:
void startTimer()
{
timer.expires_after(watchdogTime);
timer.async_wait(
std::bind_front(&ServiceWatchdog::handleTimeout, this));
}
void handleTimeout(const boost::system::error_code& ec)
{
if (ec)
{
BMCWEB_LOG_ERROR("Watchdog timer async_wait failed: {}",
ec.message());
return;
}
int rc = sd_notify(0, "WATCHDOG=1");
if (rc < 0)
{
BMCWEB_LOG_ERROR("sd_notify failed: {}", -rc);
return;
}
startTimer();
}
boost::asio::steady_timer timer;
std::chrono::duration<uint64_t, std::micro> watchdogTime{};
};
} // namespace bmcweb
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