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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 <glog/logging.h>
#include <hicn/transport/utils/spinlock.h>
#include <sys/epoll.h>
#include <utils/event_reactor.h>
#include <atomic>
#include <cstddef>
#include <functional>
#include <mutex>
#include <unordered_map>
#define FD_NUMBER 20000
namespace utils {
typedef struct epoll_event Event;
typedef std::function<int(const Event &)> EventCallback;
typedef std::unordered_map<int, EventCallback> EventCallbackMap;
class EpollEventReactor : public EventReactor {
public:
explicit EpollEventReactor()
: epoll_fd_(epoll_create(20000)), run_event_loop_(true) {}
~EpollEventReactor() { close(epoll_fd_); }
template <typename EventHandler>
int addFileDescriptor(int fd, uint32_t events, EventHandler &&callback) {
auto it = event_callback_map_.find(fd);
int ret = 0;
if (it == event_callback_map_.end()) {
{
utils::SpinLock::Acquire locked(event_callback_map_lock_);
event_callback_map_[fd] = std::forward<EventHandler>(callback);
}
ret = addFileDescriptor(fd, events);
}
return ret;
}
int delFileDescriptor(int fd) {
if (TRANSPORT_EXPECT_FALSE(fd < 0)) {
LOG(ERROR) << "invalid fd " << fd;
return -1;
}
struct epoll_event evt;
memset(&evt, 0, sizeof(evt));
if (TRANSPORT_EXPECT_FALSE(epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, &evt) <
0)) {
return -1;
}
utils::SpinLock::Acquire locked(event_callback_map_lock_);
event_callback_map_.erase(fd);
return 0;
}
int modFileDescriptor(int fd, uint32_t events) {
if (TRANSPORT_EXPECT_FALSE(fd < 0)) {
LOG(ERROR) << "invalid fd " << fd;
return -1;
}
struct epoll_event evt;
memset(&evt, 0, sizeof(evt));
evt.events = events;
evt.data.fd = fd;
if (TRANSPORT_EXPECT_FALSE(epoll_ctl(epoll_fd_, EPOLL_CTL_MOD, fd, &evt) <
0)) {
LOG(ERROR) << "epoll_ctl: " << strerror(errno) << " fd " << fd;
return -1;
}
return 0;
}
void runEventLoop(int timeout = -1) override {
Event evt[128];
int en = 0;
EventCallbackMap::iterator it;
EventCallback callback;
// evt.events = EPOLLIN | EPOLLOUT;
sigset_t sigset;
sigemptyset(&sigset);
while (run_event_loop_) {
memset(&evt, 0, sizeof(evt));
en = epoll_pwait(epoll_fd_, evt, 128, timeout, &sigset);
if (TRANSPORT_EXPECT_FALSE(en < 0)) {
LOG(ERROR) << "epoll_pwait: " << strerror(errno);
if (errno == EINTR) {
continue;
} else {
return;
}
}
for (int i = 0; i < en; i++) {
if (evt[i].data.fd > 0) {
{
utils::SpinLock::Acquire locked(event_callback_map_lock_);
it = event_callback_map_.find(evt[i].data.fd);
}
if (TRANSPORT_EXPECT_FALSE(it == event_callback_map_.end())) {
LOG(ERROR) << "unexpected event. fd " << evt[i].data.fd;
} else {
{
utils::SpinLock::Acquire locked(event_callback_map_lock_);
callback = event_callback_map_[evt[i].data.fd];
}
callback(evt[i]);
// In the callback the epoll event reactor could have been stopped,
// then we need to check whether the event loop is still running.
if (TRANSPORT_EXPECT_FALSE(!run_event_loop_)) {
return;
}
}
} else {
LOG(ERROR) << "unexpected event. fd " << evt[i].data.fd;
}
}
}
}
void runOneEvent() override {
Event evt;
int en = 0;
EventCallbackMap::iterator it;
EventCallback callback;
// evt.events = EPOLLIN | EPOLLOUT;
sigset_t sigset;
sigemptyset(&sigset);
memset(&evt, 0, sizeof(evt));
en = epoll_pwait(epoll_fd_, &evt, 1, -1, &sigset);
if (TRANSPORT_EXPECT_FALSE(en < 0)) {
LOG(ERROR) << "epoll_pwait: " << strerror(errno);
return;
}
if (TRANSPORT_EXPECT_TRUE(evt.data.fd > 0)) {
{
utils::SpinLock::Acquire locked(event_callback_map_lock_);
it = event_callback_map_.find(evt.data.fd);
}
if (TRANSPORT_EXPECT_FALSE(it == event_callback_map_.end())) {
LOG(ERROR) << "unexpected event. fd " << evt.data.fd;
} else {
{
utils::SpinLock::Acquire locked(event_callback_map_lock_);
callback = event_callback_map_[evt.data.fd];
}
callback(evt);
}
} else {
LOG(ERROR) << "unexpected event. fd " << evt.data.fd;
}
}
void stop() override { run_event_loop_ = false; }
std::size_t mapSize() { return event_callback_map_.size(); }
private:
int addFileDescriptor(int fd, uint32_t events) {
if (TRANSPORT_EXPECT_FALSE(fd < 0)) {
LOG(ERROR) << "invalid fd " << fd;
return -1;
}
struct epoll_event evt;
std::memset(&evt, 0, sizeof(evt));
evt.events = events;
evt.data.fd = fd;
if (TRANSPORT_EXPECT_FALSE(epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &evt) <
0)) {
LOG(ERROR) << "epoll_ctl: " << strerror(errno) << " fd " << fd;
return -1;
}
return 0;
}
int epoll_fd_;
std::atomic_bool run_event_loop_;
EventCallbackMap event_callback_map_;
utils::SpinLock event_callback_map_lock_;
};
} // namespace utils
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