146 lines
4.5 KiB
C++
146 lines
4.5 KiB
C++
//
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// detail/resolver_service.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_RESOLVER_SERVICE_HPP
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#define ASIO_DETAIL_RESOLVER_SERVICE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if !defined(ASIO_WINDOWS_RUNTIME)
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#include "asio/ip/basic_resolver_query.hpp"
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#include "asio/ip/basic_resolver_results.hpp"
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#include "asio/detail/concurrency_hint.hpp"
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#include "asio/detail/memory.hpp"
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#include "asio/detail/resolve_endpoint_op.hpp"
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#include "asio/detail/resolve_query_op.hpp"
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#include "asio/detail/resolver_service_base.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename Protocol>
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class resolver_service :
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public execution_context_service_base<resolver_service<Protocol> >,
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public resolver_service_base
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{
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public:
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// The implementation type of the resolver. A cancellation token is used to
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// indicate to the background thread that the operation has been cancelled.
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typedef socket_ops::shared_cancel_token_type implementation_type;
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// The endpoint type.
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typedef typename Protocol::endpoint endpoint_type;
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// The query type.
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typedef asio::ip::basic_resolver_query<Protocol> query_type;
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// The results type.
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typedef asio::ip::basic_resolver_results<Protocol> results_type;
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// Constructor.
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resolver_service(execution_context& context)
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: execution_context_service_base<resolver_service<Protocol> >(context),
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resolver_service_base(context)
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{
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}
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// Destroy all user-defined handler objects owned by the service.
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void shutdown()
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{
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this->base_shutdown();
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}
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// Perform any fork-related housekeeping.
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void notify_fork(execution_context::fork_event fork_ev)
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{
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this->base_notify_fork(fork_ev);
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}
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// Resolve a query to a list of entries.
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results_type resolve(implementation_type&, const query_type& qry,
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asio::error_code& ec)
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{
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asio::detail::addrinfo_type* address_info = 0;
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socket_ops::getaddrinfo(qry.host_name().c_str(),
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qry.service_name().c_str(), qry.hints(), &address_info, ec);
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auto_addrinfo auto_address_info(address_info);
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return ec ? results_type() : results_type::create(
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address_info, qry.host_name(), qry.service_name());
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}
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// Asynchronously resolve a query to a list of entries.
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template <typename Handler, typename IoExecutor>
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void async_resolve(implementation_type& impl, const query_type& qry,
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Handler& handler, const IoExecutor& io_ex)
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{
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// Allocate and construct an operation to wrap the handler.
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typedef resolve_query_op<Protocol, Handler, IoExecutor> op;
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typename op::ptr p = { asio::detail::addressof(handler),
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op::ptr::allocate(handler), 0 };
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p.p = new (p.v) op(impl, qry, scheduler_, handler, io_ex);
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ASIO_HANDLER_CREATION((scheduler_.context(),
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*p.p, "resolver", &impl, 0, "async_resolve"));
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start_resolve_op(p.p);
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p.v = p.p = 0;
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}
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// Resolve an endpoint to a list of entries.
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results_type resolve(implementation_type&,
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const endpoint_type& endpoint, asio::error_code& ec)
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{
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char host_name[NI_MAXHOST];
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char service_name[NI_MAXSERV];
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socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(),
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host_name, NI_MAXHOST, service_name, NI_MAXSERV,
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endpoint.protocol().type(), ec);
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return ec ? results_type() : results_type::create(
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endpoint, host_name, service_name);
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}
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// Asynchronously resolve an endpoint to a list of entries.
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template <typename Handler, typename IoExecutor>
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void async_resolve(implementation_type& impl, const endpoint_type& endpoint,
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Handler& handler, const IoExecutor& io_ex)
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{
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// Allocate and construct an operation to wrap the handler.
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typedef resolve_endpoint_op<Protocol, Handler, IoExecutor> op;
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typename op::ptr p = { asio::detail::addressof(handler),
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op::ptr::allocate(handler), 0 };
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p.p = new (p.v) op(impl, endpoint, scheduler_, handler, io_ex);
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ASIO_HANDLER_CREATION((scheduler_.context(),
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*p.p, "resolver", &impl, 0, "async_resolve"));
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start_resolve_op(p.p);
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p.v = p.p = 0;
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}
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // !defined(ASIO_WINDOWS_RUNTIME)
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#endif // ASIO_DETAIL_RESOLVER_SERVICE_HPP
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