/**
* Copyright (c) 2018 Cornell University.
*
* Author: Ted Yin <tederminant@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <cstring>
#include <cassert>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <unistd.h>
#include "salticidae/util.h"
#include "salticidae/conn.h"
namespace salticidae {
ConnPool::Conn::operator std::string() const {
DataStream s;
s << "<Conn "
<< "fd=" << std::to_string(fd) << " "
<< "addr=" << std::string(addr) << " "
<< "mode=" << ((mode == Conn::ACTIVE) ? "active" : "passive") << ">";
return std::move(s);
}
/* the following two functions are executed by exactly one worker per Conn object */
void ConnPool::Conn::send_data(evutil_socket_t fd, short events) {
if (!(events & EV_WRITE)) return;
auto conn = self(); /* pin the connection */
ssize_t ret = seg_buff_size;
for (;;)
{
bytearray_t buff_seg = send_buffer.move_pop();
ssize_t size = buff_seg.size();
if (!size) break;
ret = send(fd, buff_seg.data(), size, MSG_NOSIGNAL);
SALTICIDAE_LOG_DEBUG("socket sent %zd bytes", ret);
size -= ret;
if (size > 0)
{
if (ret < 1) /* nothing is sent */
{
/* rewind the whole buff_seg */
send_buffer.rewind(std::move(buff_seg));
if (ret < 0 && errno != EWOULDBLOCK)
{
SALTICIDAE_LOG_INFO("reason: %s", strerror(errno));
terminate();
return;
}
}
else
/* rewind the leftover */
send_buffer.rewind(
bytearray_t(buff_seg.begin() + ret, buff_seg.end()));
/* wait for the next write callback */
ready_send = false;
ev_write.add();
return;
}
}
/* consumed the buffer but endpoint still seems to be writable */
ready_send = true;
}
void ConnPool::Conn::recv_data(evutil_socket_t fd, short events) {
if (!(events & EV_READ)) return;
auto conn = self(); /* pin the connection */
ssize_t ret = seg_buff_size;
while (ret == (ssize_t)seg_buff_size)