aria2/src/AsyncNameResolverMan.cc

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2013 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 "AsyncNameResolverMan.h"
#include "AsyncNameResolver.h"
#include "DownloadEngine.h"
#include "Command.h"
#include "message.h"
#include "fmt.h"
#include "LogFactory.h"

namespace aria2 {

AsyncNameResolverMan::AsyncNameResolverMan()
  : numResolver_(0),
    resolverCheck_(0),
    ipv4_(true),
    ipv6_(true)
{}

AsyncNameResolverMan::~AsyncNameResolverMan()
{
  assert(!resolverCheck_);
}

bool AsyncNameResolverMan::started() const
{
  for(size_t i = 0; i < numResolver_; ++i) {
    if(asyncNameResolver_[i]) {
      return true;
    }
  }
  return false;
}

void AsyncNameResolverMan::startAsync(const std::string& hostname,
                                      DownloadEngine* e,
                                      Command* command)
{
  numResolver_ = 0;
  if(ipv4_) {
    startAsyncFamily(hostname, AF_INET, e, command);
    ++numResolver_;
  }
  if(ipv6_) {
    startAsyncFamily(hostname, AF_INET6, e, command);
    ++numResolver_;
  }
  A2_LOG_INFO(fmt(MSG_RESOLVING_HOSTNAME, command->getCuid(),
                  hostname.c_str()));
}

void AsyncNameResolverMan::startAsyncFamily(const std::string& hostname,
                                            int family,
                                            DownloadEngine* e,
                                            Command* command)
{
  asyncNameResolver_[numResolver_].reset
    (new AsyncNameResolver(family
#ifdef HAVE_ARES_ADDR_NODE
                           ,
                           e->getAsyncDNSServers()
#endif // HAVE_ARES_ADDR_NODE
                           ));
  asyncNameResolver_[numResolver_]->resolve(hostname);
  setNameResolverCheck(numResolver_, e, command);
}

void AsyncNameResolverMan::getResolvedAddress(std::vector<std::string>& res)
const
{
  for(size_t i = 0; i < numResolver_; ++i) {
    if(asyncNameResolver_[i]->getStatus() ==
       AsyncNameResolver::STATUS_SUCCESS) {
      const std::vector<std::string>& addrs =
        asyncNameResolver_[i]->getResolvedAddresses();
      res.insert(res.end(), addrs.begin(), addrs.end());
    }
  }
  return;
}

void AsyncNameResolverMan::setNameResolverCheck(DownloadEngine* e,
                                                Command* command)
{
  for(size_t i = 0; i < numResolver_; ++i) {
    setNameResolverCheck(i, e, command);
  }
}

void AsyncNameResolverMan::setNameResolverCheck(size_t index,
                                                DownloadEngine* e,
                                                Command* command)
{
  if(asyncNameResolver_[index]) {
    assert((resolverCheck_ & (1 << index)) == 0);
    resolverCheck_ |= 1 << index;
    e->addNameResolverCheck(asyncNameResolver_[index], command);
  }
}

void AsyncNameResolverMan::disableNameResolverCheck(DownloadEngine* e,
                                                    Command* command)
{
  for(size_t i = 0; i < numResolver_; ++i) {
    disableNameResolverCheck(i, e, command);
  }
}

void AsyncNameResolverMan::disableNameResolverCheck(size_t index,
                                                    DownloadEngine* e,
                                                    Command* command)
{
  if(asyncNameResolver_[index] && (resolverCheck_ & (1 << index))) {
    resolverCheck_ &= ~(1 << index);
    e->deleteNameResolverCheck(asyncNameResolver_[index], command);
  }
}

int AsyncNameResolverMan::getStatus() const
{
  size_t error = 0;
  for(size_t i = 0; i < numResolver_; ++i) {
    switch(asyncNameResolver_[i]->getStatus()) {
    case AsyncNameResolver::STATUS_SUCCESS:
      return 1;
    case AsyncNameResolver::STATUS_ERROR:
      ++error;
      break;
    default:
      break;
    }
  }
  return error == numResolver_ ? -1 : 0;
}

const std::string& AsyncNameResolverMan::getLastError() const
{
  for(size_t i = 0; i < numResolver_; ++i) {
    if(asyncNameResolver_[i]->getStatus() == AsyncNameResolver::STATUS_ERROR) {
      // TODO This is not last error chronologically.
      return asyncNameResolver_[i]->getError();
    }
  }
  return A2STR::NIL;
}

} // namespace aria2