/*
 * nghttp2 - HTTP/2 C Library
 *
 * Copyright (c) 2014 Tatsuhiro Tsujikawa
 *
 * 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 "shrpx_accept_handler.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H

#include <cerrno>

#include "shrpx_connection_handler.h"
#include "shrpx_config.h"
#include "util.h"

using namespace nghttp2;

namespace shrpx {

namespace {
void acceptcb(struct ev_loop *loop, ev_io *w, int revent) {
  auto h = static_cast<AcceptHandler *>(w->data);
  h->accept_connection();
}
} // namespace

AcceptHandler::AcceptHandler(int fd, ConnectionHandler *h)
    : conn_hnr_(h), fd_(fd) {
  ev_io_init(&wev_, acceptcb, fd_, EV_READ);
  wev_.data = this;
  ev_io_start(conn_hnr_->get_loop(), &wev_);
}

AcceptHandler::~AcceptHandler() {
  ev_io_stop(conn_hnr_->get_loop(), &wev_);
  close(fd_);
}

void AcceptHandler::accept_connection() {
  for (;;) {
    sockaddr_union sockaddr;
    socklen_t addrlen = sizeof(sockaddr);

#ifdef HAVE_ACCEPT4
    auto cfd =
        accept4(fd_, &sockaddr.sa, &addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC);
#else  // !HAVE_ACCEPT4
    auto cfd = accept(fd_, &sockaddr.sa, &addrlen);
#endif // !HAVE_ACCEPT4

    if (cfd == -1) {
      switch (errno) {
      case EINTR:
      case ENETDOWN:
      case EPROTO:
      case ENOPROTOOPT:
      case EHOSTDOWN:
#ifdef ENONET
      case ENONET:
#endif // ENONET
      case EHOSTUNREACH:
      case EOPNOTSUPP:
      case ENETUNREACH:
        continue;
      case EMFILE:
      case ENFILE:
        LOG(WARN) << "acceptor: running out file descriptor; disable acceptor "
                     "temporarily";
        conn_hnr_->disable_acceptor_temporary(30.);
        break;
      }

      break;
    }

#ifndef HAVE_ACCEPT4
    util::make_socket_nonblocking(cfd);
    util::make_socket_closeonexec(cfd);
#endif // !HAVE_ACCEPT4

    util::make_socket_nodelay(cfd);

    conn_hnr_->handle_connection(cfd, &sockaddr.sa, addrlen);
  }
}

void AcceptHandler::enable() { ev_io_start(conn_hnr_->get_loop(), &wev_); }

void AcceptHandler::disable() { ev_io_stop(conn_hnr_->get_loop(), &wev_); }

int AcceptHandler::get_fd() const { return fd_; }

} // namespace shrpx
