/*
 * Copyright 2014-present Facebook, Inc.
 *
 * 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 <folly/net/NetworkSocket.h>

namespace folly {

class SocketPair {
 public:
  enum Mode { BLOCKING, NONBLOCKING };

  explicit SocketPair(Mode mode = NONBLOCKING);
  ~SocketPair();

  int operator[](int index) const {
    return fds_[index].toFd();
  }

  void closeFD0();
  void closeFD1();

  NetworkSocket extractNetworkSocket0() {
    return extractNetworkSocket(0);
  }
  NetworkSocket extractNetworkSocket1() {
    return extractNetworkSocket(1);
  }

  int extractFD0() {
    return extractNetworkSocket0().toFd();
  }
  int extractFD1() {
    return extractNetworkSocket1().toFd();
  }

  NetworkSocket extractNetworkSocket(int index) {
    auto fd = fds_[index];
    fds_[index] = NetworkSocket();
    return fd;
  }

  int extractFD(int index) {
    return extractNetworkSocket(index).toFd();
  }

 private:
  NetworkSocket fds_[2];
};

} // namespace folly
