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example.cpp
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example.cpp
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/* For sockaddr_in */
#include <netinet/in.h>
/* For socket functions */
#include <sys/socket.h>
/* For fcntl */
#include <fcntl.h>
#include <evhttp.h>
// from libevent
#include <event2/event.h>
#include <event2/buffer.h>
#include <event2/bufferevent.h>
// standard libs
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <iostream>
#define MAX_LINE 16384
struct WriteProgress {
std::string message;
bool written;
bool ready;
};
WriteProgress context;
/* just writes prints everything it receives
*/
void readcb(struct bufferevent *bev, void *ctx)
{
WriteProgress *context = (WriteProgress*) ctx;
int number_read;
char buffer[1024];
std::cout << "***read callback***\n";
struct evbuffer *input = bufferevent_get_input(bev);
size_t total_input_length = evbuffer_get_length(input);
std::cout << "just received " << total_input_length << "\n";
// keep reading until everything has been printed!
while ((number_read = evbuffer_remove(input, buffer, sizeof(buffer))) > 0) {
std::cout << buffer;
}
context->ready=true;
//
// char response_text[] = "this is a response";
// struct evbuffer *output = bufferevent_get_output(bev);
//
// evbuffer_add(output, response_text, sizeof(response_text)); // TODO: does sizeof work here?
}
void write_callback(struct bufferevent *bev, void *ctx)
{
WriteProgress *context = (WriteProgress*) ctx;
if (!context->written && context->ready) {
std::cout << "***writing response***\n";
std::cout << context->message.c_str() << "\n";
struct evbuffer *output = bufferevent_get_output(bev);
evbuffer_add(output, context->message.c_str(), context->message.length()); // TODO: does sizeof work here?
bufferevent_write_buffer(bev, output); // write all this to the wire!
context->written = true;
}
}
void
errorcb(struct bufferevent *bev, short error, void *ctx)
{
if (error & BEV_EVENT_CONNECTED) {
std::cout << "connected\n";
} else {
if (error & BEV_EVENT_EOF) {
std::cout << "connection closed\n";
/* connection has been closed, do any clean up here */
/* ... */
} else if (error & BEV_EVENT_ERROR) {
std::cout << "error\n";
/* check errno to see what error occurred */
/* ... */
} else if (error & BEV_EVENT_TIMEOUT) {
std::cout << "timeout\n";
/* must be a timeout event handle, handle it */
/* ... */
}
// we're done with this bufferevent becuase the connection closed
bufferevent_free(bev);
}
}
void
do_accept(evutil_socket_t listener, short event, void *arg)
{
struct event_base *base = (event_base*) arg;
struct sockaddr_storage ss;
socklen_t slen = sizeof(ss);
int fd = accept(listener, (struct sockaddr*)&ss, &slen);
std::cout << "*** do_accept got assigned" << fd << "***\n";
if (fd < 0) {
throw "Error accepting connection.";
} else if (fd > FD_SETSIZE) {
close(fd);
} else {
context.ready = false;
context.written = false;
// if everything worked as expected:
struct bufferevent *bev;
// set socket to nonblocking mode
evutil_make_socket_nonblocking(fd);
// create a new bufferevent
bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
// read, write, signal, data
bufferevent_setcb(bev, readcb, write_callback, errorcb, &context);
bufferevent_setwatermark(bev, EV_READ, 0, MAX_LINE);
bufferevent_enable(bev, EV_READ|EV_WRITE);
}
}
void
run(void)
{
evutil_socket_t listener; // socket itself
struct sockaddr_in sin; // socket address
struct event_base *base;
struct event *listener_event;
// create an event_base
base = event_base_new();
// if (!base)
// return; /*XXXerr*/
// setup a listener
listener = socket(AF_INET, SOCK_STREAM, 0);
evutil_make_socket_nonblocking(listener);
#ifndef WIN32
{
int one = 1;
setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
}
#endif
// setup socket in and bind listener
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = 0;
sin.sin_port = htons(40713);
if (bind(listener, (struct sockaddr*)&sin, sizeof(sin)) < 0)
throw "bind";
// opens the socket for listening
// 0 means success here
if (listen(listener, 16) < 0) // TODO: why 16 ?
throw "listen";
// what does EV_PERSIST do ??
listener_event = event_new(base, listener, EV_READ|EV_PERSIST, do_accept, (void*)base);
event_add(listener_event, NULL); // NULL so that we add the event immediately
// keeps running event loop until there are no more registered events
event_base_dispatch(base);
}
int
main(int c, char **v)
{
context.message = "HTTP/1.1 200 OK\r\n<html><h1>hello</h1></html>\r\n\r\n";
setvbuf(stdout, NULL, _IONBF, 0); // TODO: figure out what this does
run();
return 0;
}