SimpleEventBuilder/testing/connection_method/event_builder_epoll.cxx

283 lines
8.7 KiB
C++

#include <asm-generic/errno-base.h>
#include <asm-generic/errno.h>
#include <cerrno>
#include <cstddef>
#include <cstdio> // for fprintf()
#include <unistd.h> // for close(), read()
#include <sys/epoll.h> // for epoll_create1(), epoll_ctl(), struct epoll_event
#include <cstring> // for strncmp
//my addition to the online guide
#include <csignal>
#include <cstdlib>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <vector>
#include <chrono>
#include <fstream>
#define MAX_EVENTS 20000
int makeSocket() {
int sockfd;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
return sockfd;
}
void bindSocketPort(int server_fd, int port) {
struct sockaddr_in localAddr;
localAddr.sin_family = AF_INET;
localAddr.sin_addr.s_addr = INADDR_ANY;
localAddr.sin_port = htons(port);
if (bind(server_fd, (struct sockaddr *)&localAddr, sizeof(localAddr)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
printf("FD %d bound to port %d\n", server_fd, port);
}
void startListening(int server_fd) {
if (listen(server_fd, 20000) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
printf("FD %d listening to new connections\n", server_fd);
}
int acceptConnection(int server_fd) {
int client_fd;
struct sockaddr_in remoteAddr;
size_t addrlen = sizeof(remoteAddr);
if ((client_fd = accept(server_fd, (struct sockaddr *)&remoteAddr, (socklen_t *)&addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
} else {
int flags = fcntl(client_fd, F_GETFL);
fcntl(client_fd, F_SETFL, flags | O_NONBLOCK);
}
printf("Connection from host %s, port %d, FD %d\n", inet_ntoa(remoteAddr.sin_addr), ntohs(remoteAddr.sin_port), client_fd);
return client_fd;
}
void acceptConnectionEpollStyle(int server_fd, int &efd) {
struct sockaddr_in new_remoteAddr;
int addrlen = sizeof(struct sockaddr_in);
while (true) {
int conn_sock = accept(server_fd, (struct sockaddr*)&new_remoteAddr, (socklen_t*)&addrlen);
if (conn_sock == -1) {
// All incoming connections have been processed
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) {
break;
} else {
perror("accept");
break;
}
}
// make new connection non-blocking
int flags = fcntl(conn_sock, F_GETFL, 0);
fcntl(conn_sock, F_SETFL, flags | O_NONBLOCK);
// monitor new connection for read events, always in edge triggered
struct epoll_event event;
event.events = EPOLLIN;// | EPOLLET;
event.data.fd = conn_sock;
// Allow epoll to monitor the new connection
if (epoll_ctl(efd, EPOLL_CTL_ADD, conn_sock, &event) == -1) {
perror("epoll_ctl: conn_sock");
break;
}
printf("Accepted epoll style connection from %s:%d from fd: %d\n", inet_ntoa(new_remoteAddr.sin_addr), ntohs(new_remoteAddr.sin_port), conn_sock);
}
}
void term_handler(int signal) {
printf("Terminated, received SIGNAL %d", signal);
exit(EXIT_SUCCESS);
}
int main(int argc, char const *argv[]) {
signal(SIGTERM, term_handler);
if (argc != 2) {
printf("Usage: %s portNumber \n", argv[0]);
exit(EXIT_FAILURE);
}
int port = atoi(argv[1]);
printf("Start socket port %d\n", port);
int master_socket;
const int opt = 1;
master_socket = makeSocket();
//set master socket to allow multiple connections ,
//this is just a good habit, it will work without this
if( setsockopt(master_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&opt,
sizeof(opt)) < 0 )
{
perror("setsockopt");
exit(EXIT_FAILURE);
}
bindSocketPort(master_socket, port);
startListening(master_socket);
int flags = fcntl(master_socket, F_GETFL, 0);
fcntl(master_socket, F_SETFL, flags | O_NONBLOCK);
struct epoll_event ev, events[MAX_EVENTS];
//create the epoll instance
int epoll_fd = epoll_create1(0);
if (epoll_fd == -1) {
printf("Failed to create epoll file descriptor\n");
exit(EXIT_FAILURE);
}
ev.data.fd = master_socket;
// Reading events with edge triggered mode
ev.events = EPOLLIN;// | EPOLLET;
// Allowing epoll to monitor the master_socket
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, master_socket, &ev) == -1){
perror("epoll_ctl");
exit(EXIT_FAILURE);
}
std::vector<int> sizes;
std::vector<uint64_t> tot_received_data;
std::vector<double> times;
int increment = 499;
for (int buf_size = 1; buf_size < 1e6 + 1; ) {
switch (buf_size) {
case 500:
increment = 500;
break;
case (int) 1e3:
increment = 1e3;
break;
case (int) 5e3:
increment = 5e3;
break;
case (int) 1e4:
increment = 1e4;
break;
case (int) 5e4:
increment = 5e4;
break;
case (int) 1e5:
increment = 1e5;
break;
case (int) 5e5:
increment = 5e5;
break;
}
printf("Next increment %d with current i: %d\n", increment, buf_size);
uint64_t bytes_read = 0;
uint64_t kBytes_read = 0;
double total_time_taken = 0;
while (true) {
// Time measurements
auto start = std::chrono::high_resolution_clock::now();
// Returns only the sockets for which there are events
//printf("Before wait\n");
int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
//printf("After wait\n");
if (nfds == -1) {
perror("epoll_wait");
exit(EXIT_FAILURE);
}
// Iterate on the sockets having events
for (int i = 0; i < nfds; i++) {
//printf("Tot fds = %d reading from %d\n", nfds, i);
int fd = events[i].data.fd;
if (fd == master_socket) {
// If the activity is on the master socket, than it's a new connection request
acceptConnectionEpollStyle(master_socket, epoll_fd);
} else if ((events[i].events & EPOLLERR) || (events[i].events & EPOLLHUP) || (!(events[i].events & EPOLLIN))) {
// Than the client connection is closed, so I close it
printf("Closing %d", fd);
close(fd);
} else {
// Than we received data from one of the monitored sockets
char buffer[buf_size];
int valread = 0;
//while (valread != EAGAIN) {
valread = recv(fd, &buffer, buf_size, 0);
if (valread > 0) {
//printf("[RICEVUTO]\t FROM %d\n", fd);
bytes_read += valread;
int kilos = 0;
if ((kilos = bytes_read / 1024) > 0) {
kBytes_read += kilos;
bytes_read -= (kilos * 1024);
//printf("reade bites %lu", bytes_read);
}
}
//}
}
}
auto end = std::chrono::high_resolution_clock::now();
double time_taken = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start).count();
//time taken in milliseconds
time_taken *= 1e-6;
total_time_taken += time_taken;
if (total_time_taken > 3e4) {
times.push_back(total_time_taken);
sizes.push_back(buf_size);
tot_received_data.push_back(kBytes_read);
break;
}
}
buf_size += increment;
}
std::ofstream fout;
fout.open("epoll_data_stats_1000_TIMEOUT.csv");
//the time is in milliseconds and the data in kbytes
fout << "buffer_size;time;total_received_data;\n";
auto iter_sizes = sizes.begin();
auto iter_times = times.begin();
auto iter_data = tot_received_data.begin();
for ( ; (iter_sizes != sizes.end()) && (iter_times != times.end()) && (iter_data != tot_received_data.end()) ; (++iter_sizes, ++iter_times, ++iter_data) ) {
fout << *iter_sizes << ";" << *iter_times << ";" << *iter_data << ";\n";
}
fout.close();
if (close(epoll_fd)) {
printf("Failed to close epoll file descriptor");
exit(EXIT_FAILURE);
}
return 0;
}