Scale Stack 0.3 Developer Documentation

scalestack/network/ip/address_service.cc

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/*
 * Scale Stack
 *
 * Copyright 2010 Eric Day
 *
 * 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.
 */

#include "config.h"

#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <scalestack/kernel/module.h>
#include <scalestack/network/ip/address_service.h>

using namespace std;

namespace scalestack
{
namespace network
{
namespace ip
{

/*
 * Public methods.
 */

address_service::address_service(kernel::module& module):
  _module(module),
  _addresses()
{
}

address_service::~address_service()
{
  if (_addresses != NULL)
    freeaddrinfo(_addresses);
}

void address_service::parse_addresses(const std::string& addresses,
                                      bool  default_value_is_host,
                                      const std::string& default_value,
                                      const struct addrinfo& address_options)
{
  string::size_type current = 0;

  do
  {
    string::size_type next = addresses.find_first_of(",", current);
    string address = addresses.substr(current, next - current);
    string::size_type port = address.find_last_of(":");

    if (port == string::npos)
    {
      if (default_value_is_host)
        lookup_addresses(default_value, address, address_options);
      else
        lookup_addresses(address, default_value, address_options);
    }
    else
    {
      lookup_addresses(address.substr(0, port), address.substr(port + 1),
                       address_options);
    }

    current = addresses.find_first_not_of(",", next);
  }
  while (current != string::npos);
}

void address_service::lookup_addresses(const std::string& host,
                                       const std::string& port,
                                       const struct addrinfo& address_options)
{
  int return_code = ::getaddrinfo(host == "" ? NULL : host.c_str(),
                                  port == "" ? NULL : port.c_str(),
                                  &address_options, &_addresses);
  if (return_code != 0)
    _module.log_fatal(_("Failed getaddrinfo: %s"), gai_strerror(return_code));

  if (add_addresses(_addresses))
    freeaddrinfo(_addresses);

  _addresses = NULL;
}

} /* namespace ip */
} /* namespace network */
} /* namespace scalestack */

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