1 //
2 // detail/winrt_resolve_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 //
10 
11 #ifndef BOOST_ASIO_DETAIL_WINRT_RESOLVE_OP_HPP
12 #define BOOST_ASIO_DETAIL_WINRT_RESOLVE_OP_HPP
13 
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
15 # pragma once
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17 
18 #include <boost/asio/detail/config.hpp>
19 
20 #if defined(BOOST_ASIO_WINDOWS_RUNTIME)
21 
22 #include <boost/asio/detail/bind_handler.hpp>
23 #include <boost/asio/detail/fenced_block.hpp>
24 #include <boost/asio/detail/handler_alloc_helpers.hpp>
25 #include <boost/asio/detail/handler_invoke_helpers.hpp>
26 #include <boost/asio/detail/handler_work.hpp>
27 #include <boost/asio/detail/memory.hpp>
28 #include <boost/asio/detail/winrt_async_op.hpp>
29 #include <boost/asio/ip/basic_resolver_results.hpp>
30 #include <boost/asio/error.hpp>
31 
32 #include <boost/asio/detail/push_options.hpp>
33 
34 namespace boost {
35 namespace asio {
36 namespace detail {
37 
38 template <typename Protocol, typename Handler, typename IoExecutor>
39 class winrt_resolve_op :
40   public winrt_async_op<
41     Windows::Foundation::Collections::IVectorView<
42       Windows::Networking::EndpointPair^>^>
43 {
44 public:
45   BOOST_ASIO_DEFINE_HANDLER_PTR(winrt_resolve_op);
46 
47   typedef typename Protocol::endpoint endpoint_type;
48   typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
49   typedef boost::asio::ip::basic_resolver_results<Protocol> results_type;
50 
winrt_resolve_op(const query_type & query,Handler & handler,const IoExecutor & io_ex)51   winrt_resolve_op(const query_type& query,
52       Handler& handler, const IoExecutor& io_ex)
53     : winrt_async_op<
54         Windows::Foundation::Collections::IVectorView<
55           Windows::Networking::EndpointPair^>^>(
56             &winrt_resolve_op::do_complete),
57       query_(query),
58       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
59       work_(handler_, io_ex)
60   {
61   }
62 
do_complete(void * owner,operation * base,const boost::system::error_code &,std::size_t)63   static void do_complete(void* owner, operation* base,
64       const boost::system::error_code&, std::size_t)
65   {
66     // Take ownership of the operation object.
67     winrt_resolve_op* o(static_cast<winrt_resolve_op*>(base));
68     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
69 
70     BOOST_ASIO_HANDLER_COMPLETION((*o));
71 
72     // Take ownership of the operation's outstanding work.
73     handler_work<Handler, IoExecutor> w(
74         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
75           o->work_));
76 
77     results_type results = results_type();
78     if (!o->ec_)
79     {
80       try
81       {
82         results = results_type::create(o->result_, o->query_.hints(),
83             o->query_.host_name(), o->query_.service_name());
84       }
85       catch (Platform::Exception^ e)
86       {
87         o->ec_ = boost::system::error_code(e->HResult,
88             boost::system::system_category());
89       }
90     }
91 
92     // Make a copy of the handler so that the memory can be deallocated before
93     // the upcall is made. Even if we're not about to make an upcall, a
94     // sub-object of the handler may be the true owner of the memory associated
95     // with the handler. Consequently, a local copy of the handler is required
96     // to ensure that any owning sub-object remains valid until after we have
97     // deallocated the memory here.
98     detail::binder2<Handler, boost::system::error_code, results_type>
99       handler(o->handler_, o->ec_, results);
100     p.h = boost::asio::detail::addressof(handler.handler_);
101     p.reset();
102 
103     // Make the upcall if required.
104     if (owner)
105     {
106       fenced_block b(fenced_block::half);
107       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
108       w.complete(handler, handler.handler_);
109       BOOST_ASIO_HANDLER_INVOCATION_END;
110     }
111   }
112 
113 private:
114   query_type query_;
115   Handler handler_;
116   handler_work<Handler, IoExecutor> executor_;
117 };
118 
119 } // namespace detail
120 } // namespace asio
121 } // namespace boost
122 
123 #include <boost/asio/detail/pop_options.hpp>
124 
125 #endif // defined(BOOST_ASIO_WINDOWS_RUNTIME)
126 
127 #endif // BOOST_ASIO_DETAIL_WINRT_RESOLVE_OP_HPP
128