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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <hicn/transport/errors/runtime_exception.h>
#include <hicn/transport/utils/chrono_typedefs.h>
#include <sys/timerfd.h>
#include <unistd.h>
#include <utils/deadline_timer.h>
#include <utils/epoll_event_reactor.h>
#include <chrono>
#include <cstddef>
namespace utils {
class FdDeadlineTimer : public DeadlineTimer<FdDeadlineTimer> {
public:
explicit FdDeadlineTimer(EpollEventReactor &reactor)
: reactor_(reactor),
timer_fd_(timerfd_create(CLOCK_MONOTONIC, 0)),
flags_(0) {
if (timer_fd_ == -1) {
throw errors::RuntimeException("Impossible to create the timer!");
}
}
FdDeadlineTimer(const FdDeadlineTimer &other)
: reactor_(other.reactor_),
timer_fd_(other.timer_fd_),
flags_(other.flags_) {}
~FdDeadlineTimer() { close(timer_fd_); }
template <typename WaitHandler>
void asyncWaitImpl(WaitHandler &&callback) {
// ASIO_WAIT_HANDLER_CHECK(WaitHandler, callback) type_check;
if (timerfd_settime(timer_fd_, flags_, &new_value_, NULL) == -1) {
throw errors::RuntimeException("Impossible to set the timer!");
}
uint32_t events = EPOLLIN;
reactor_.addFileDescriptor(
timer_fd_, events,
[callback =
std::forward<WaitHandler>(callback)](const Event &event) -> int {
uint64_t s = 0;
std::error_code ec;
if (read(event.data.fd, &s, sizeof(s)) == -1) {
LOG(ERROR) << "Read error!!";
}
if (!(event.events & EPOLLIN)) {
ec = std::make_error_code(std::errc::operation_canceled);
}
callback(ec);
return 0;
});
}
void waitImpl() {
if (timerfd_settime(timer_fd_, flags_, &new_value_, NULL) == -1) {
throw errors::RuntimeException("Impossible to set the timer!");
}
uint64_t ret;
if (read(timer_fd_, &ret, sizeof(ret)) == -1) {
throw errors::RuntimeException(
"Error while waiting for the timer expiration.");
}
}
template <typename T, typename R>
void expiresFromNowImpl(std::chrono::duration<T, R> &&duration) {
std::memset(&new_value_, 0, sizeof(new_value_));
new_value_.it_value = std::chrono::duration_cast<struct timespec>(duration);
}
template <typename TimePoint,
typename = std::enable_if_t<
std::is_same<std::remove_reference_t<TimePoint>,
std::chrono::steady_clock::time_point>::value,
TimePoint>>
void expiresAtImpl(TimePoint &&time_point) {
std::memset(&new_value_, 0, sizeof(new_value_));
new_value_.it_value = std::chrono::duration_cast<struct timespec>(
time_point.time_since_epoch());
flags_ |= TFD_TIMER_ABSTIME;
}
void cancelImpl() {
std::memset(&new_value_, 0, sizeof(new_value_));
if (timerfd_settime(timer_fd_, 0, &new_value_, NULL) == -1) {
throw errors::RuntimeException("Impossible to cancel the timer!");
}
// reactor_.delFileDescriptor(timer_fd_);
}
EventReactor &getEventReactor() { return reactor_; }
private:
EpollEventReactor &reactor_;
int timer_fd_;
EventCallback callback_;
struct itimerspec new_value_;
int flags_;
};
} // namespace utils
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