/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2009 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "HttpListenCommand.h"
#include "DownloadEngine.h"
#include "RecoverableException.h"
#include "message.h"
#include "Logger.h"
#include "LogFactory.h"
#include "SocketCore.h"
#include "HttpServerCommand.h"
#include "CUIDCounter.h"
#include "RequestGroupMan.h"
#include "prefs.h"
#include "Option.h"
#include "util.h"
#include "A2STR.h"
#include "fmt.h"

namespace aria2 {

HttpListenCommand::HttpListenCommand(cuid_t cuid, DownloadEngine* e,
                                     int family, bool secure)
  : Command(cuid),
    e_(e),
    family_(family),
    secure_(secure)
{}

HttpListenCommand::~HttpListenCommand()
{
  if(serverSocket_) {
    e_->deleteSocketForReadCheck(serverSocket_, this);
  }
}

bool HttpListenCommand::execute()
{
  if(e_->getRequestGroupMan()->downloadFinished() || e_->isHaltRequested()) {
    return true;
  }
  try {
    if(serverSocket_->isReadable(0)) {
      std::shared_ptr<SocketCore> socket(serverSocket_->acceptConnection());
      socket->setTcpNodelay(true);
      std::pair<std::string, uint16_t> peerInfo;
      socket->getPeerInfo(peerInfo);

      A2_LOG_INFO(fmt("RPC: Accepted the connection from %s:%u.",
                      peerInfo.first.c_str(), peerInfo.second));

      e_->setNoWait(true);
      e_->addCommand(make_unique<HttpServerCommand>
                     (e_->newCUID(), e_, socket, secure_));
    }
  } catch(RecoverableException& e) {
    A2_LOG_DEBUG_EX(fmt(MSG_ACCEPT_FAILURE, getCuid()), e);
  }
  e_->addCommand(std::unique_ptr<Command>(this));
  return false;
}

bool HttpListenCommand::bindPort(uint16_t port)
{
  if(serverSocket_) {
    e_->deleteSocketForReadCheck(serverSocket_, this);
  }
  serverSocket_ = std::make_shared<SocketCore>();
  const int ipv = (family_ == AF_INET) ? 4 : 6;
  try {
    int flags = 0;
    if(e_->getOption()->getAsBool(PREF_RPC_LISTEN_ALL)) {
      flags = AI_PASSIVE;
    }
    serverSocket_->bind(nullptr, port, family_, flags);
    serverSocket_->beginListen();
    A2_LOG_INFO(fmt(MSG_LISTENING_PORT,
                    getCuid(), port));
    e_->addSocketForReadCheck(serverSocket_, this);
    A2_LOG_NOTICE(fmt(_("IPv%d RPC: listening on TCP port %u"), ipv, port));
    return true;
  } catch(RecoverableException& e) {
    A2_LOG_ERROR_EX(fmt("IPv%d RPC: failed to bind TCP port %u", ipv, port), e);
    serverSocket_->closeConnection();
  }
  return false;
}

} // namespace aria2
