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//
// detail/resolver_service.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
#define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
#include <boost/asio/ip/basic_resolver_query.hpp>
#include <boost/asio/ip/basic_resolver_results.hpp>
#include <boost/asio/detail/concurrency_hint.hpp>
#include <boost/asio/detail/memory.hpp>
#include <boost/asio/detail/resolve_endpoint_op.hpp>
#include <boost/asio/detail/resolve_query_op.hpp>
#include <boost/asio/detail/resolver_service_base.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Protocol>
class resolver_service :
public service_base<resolver_service<Protocol> >,
public resolver_service_base
{
public:
// The implementation type of the resolver. A cancellation token is used to
// indicate to the background thread that the operation has been cancelled.
typedef socket_ops::shared_cancel_token_type implementation_type;
// The endpoint type.
typedef typename Protocol::endpoint endpoint_type;
// The query type.
typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
// The results type.
typedef boost::asio::ip::basic_resolver_results<Protocol> results_type;
// Constructor.
resolver_service(boost::asio::io_context& io_context)
: service_base<resolver_service<Protocol> >(io_context),
resolver_service_base(io_context)
{
}
// Destroy all user-defined handler objects owned by the service.
void shutdown()
{
this->base_shutdown();
}
// Perform any fork-related housekeeping.
void notify_fork(boost::asio::io_context::fork_event fork_ev)
{
this->base_notify_fork(fork_ev);
}
// Resolve a query to a list of entries.
results_type resolve(implementation_type&, const query_type& query,
boost::system::error_code& ec)
{
boost::asio::detail::addrinfo_type* address_info = 0;
socket_ops::getaddrinfo(query.host_name().c_str(),
query.service_name().c_str(), query.hints(), &address_info, ec);
auto_addrinfo auto_address_info(address_info);
return ec ? results_type() : results_type::create(
address_info, query.host_name(), query.service_name());
}
// Asynchronously resolve a query to a list of entries.
template <typename Handler>
void async_resolve(implementation_type& impl,
const query_type& query, Handler& handler)
{
// Allocate and construct an operation to wrap the handler.
typedef resolve_query_op<Protocol, Handler> op;
typename op::ptr p = { boost::asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl, query, io_context_impl_, handler);
BOOST_ASIO_HANDLER_CREATION((io_context_impl_.context(),
*p.p, "resolver", &impl, 0, "async_resolve"));
start_resolve_op(p.p);
p.v = p.p = 0;
}
// Resolve an endpoint to a list of entries.
results_type resolve(implementation_type&,
const endpoint_type& endpoint, boost::system::error_code& ec)
{
char host_name[NI_MAXHOST];
char service_name[NI_MAXSERV];
socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(),
host_name, NI_MAXHOST, service_name, NI_MAXSERV,
endpoint.protocol().type(), ec);
return ec ? results_type() : results_type::create(
endpoint, host_name, service_name);
}
// Asynchronously resolve an endpoint to a list of entries.
template <typename Handler>
void async_resolve(implementation_type& impl,
const endpoint_type& endpoint, Handler& handler)
{
// Allocate and construct an operation to wrap the handler.
typedef resolve_endpoint_op<Protocol, Handler> op;
typename op::ptr p = { boost::asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl, endpoint, io_context_impl_, handler);
BOOST_ASIO_HANDLER_CREATION((io_context_impl_.context(),
*p.p, "resolver", &impl, 0, "async_resolve"));
start_resolve_op(p.p);
p.v = p.p = 0;
}
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
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