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+//
+// detail/winrt_resolver_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP
+#define ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_WINDOWS_RUNTIME)
+
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/ip/basic_resolver_results.hpp"
+#include "asio/post.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/winrt_async_manager.hpp"
+#include "asio/detail/winrt_resolve_op.hpp"
+#include "asio/detail/winrt_utils.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_io_context.hpp"
+#else // defined(ASIO_HAS_IOCP)
+# include "asio/detail/scheduler.hpp"
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class winrt_resolver_service :
+ public execution_context_service_base<winrt_resolver_service<Protocol> >
+{
+public:
+ // The implementation type of the resolver. A cancellation token is used to
+ // indicate to the asynchronous operation 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 asio::ip::basic_resolver_query<Protocol> query_type;
+
+ // The results type.
+ typedef asio::ip::basic_resolver_results<Protocol> results_type;
+
+ // Constructor.
+ winrt_resolver_service(execution_context& context)
+ : execution_context_service_base<
+ winrt_resolver_service<Protocol> >(context),
+ scheduler_(use_service<scheduler_impl>(context)),
+ async_manager_(use_service<winrt_async_manager>(context))
+ {
+ }
+
+ // Destructor.
+ ~winrt_resolver_service()
+ {
+ }
+
+ // Destroy all user-defined handler objects owned by the service.
+ void shutdown()
+ {
+ }
+
+ // Perform any fork-related housekeeping.
+ void notify_fork(execution_context::fork_event)
+ {
+ }
+
+ // Construct a new resolver implementation.
+ void construct(implementation_type&)
+ {
+ }
+
+ // Move-construct a new resolver implementation.
+ void move_construct(implementation_type&,
+ implementation_type&)
+ {
+ }
+
+ // Move-assign from another resolver implementation.
+ void move_assign(implementation_type&,
+ winrt_resolver_service&, implementation_type&)
+ {
+ }
+
+ // Destroy a resolver implementation.
+ void destroy(implementation_type&)
+ {
+ }
+
+ // Cancel pending asynchronous operations.
+ void cancel(implementation_type&)
+ {
+ }
+
+ // Resolve a query to a list of entries.
+ results_type resolve(implementation_type&,
+ const query_type& query, asio::error_code& ec)
+ {
+ try
+ {
+ using namespace Windows::Networking::Sockets;
+ auto endpoint_pairs = async_manager_.sync(
+ DatagramSocket::GetEndpointPairsAsync(
+ winrt_utils::host_name(query.host_name()),
+ winrt_utils::string(query.service_name())), ec);
+
+ if (ec)
+ return results_type();
+
+ return results_type::create(
+ endpoint_pairs, query.hints(),
+ query.host_name(), query.service_name());
+ }
+ catch (Platform::Exception^ e)
+ {
+ ec = asio::error_code(e->HResult,
+ asio::system_category());
+ return results_type();
+ }
+ }
+
+ // Asynchronously resolve a query to a list of entries.
+ template <typename Handler, typename IoExecutor>
+ void async_resolve(implementation_type& impl, const query_type& query,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef winrt_resolve_op<Protocol, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(query, handler, io_ex);
+
+ ASIO_HANDLER_CREATION((scheduler_.context(),
+ *p.p, "resolver", &impl, 0, "async_resolve"));
+ (void)impl;
+
+ try
+ {
+ using namespace Windows::Networking::Sockets;
+ async_manager_.async(DatagramSocket::GetEndpointPairsAsync(
+ winrt_utils::host_name(query.host_name()),
+ winrt_utils::string(query.service_name())), p.p);
+ p.v = p.p = 0;
+ }
+ catch (Platform::Exception^ e)
+ {
+ p.p->ec_ = asio::error_code(
+ e->HResult, asio::system_category());
+ scheduler_.post_immediate_completion(p.p, is_continuation);
+ p.v = p.p = 0;
+ }
+ }
+
+ // Resolve an endpoint to a list of entries.
+ results_type resolve(implementation_type&,
+ const endpoint_type&, asio::error_code& ec)
+ {
+ ec = asio::error::operation_not_supported;
+ return results_type();
+ }
+
+ // Asynchronously resolve an endpoint to a list of entries.
+ template <typename Handler, typename IoExecutor>
+ void async_resolve(implementation_type&, const endpoint_type&,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ asio::error_code ec = asio::error::operation_not_supported;
+ const results_type results;
+ asio::post(io_ex, detail::bind_handler(handler, ec, results));
+ }
+
+private:
+ // The scheduler implementation used for delivering completions.
+#if defined(ASIO_HAS_IOCP)
+ typedef class win_iocp_io_context scheduler_impl;
+#else
+ typedef class scheduler scheduler_impl;
+#endif
+ scheduler_impl& scheduler_;
+
+ winrt_async_manager& async_manager_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_WINDOWS_RUNTIME)
+
+#endif // ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP