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1 | // |
2 | // detail/resolve_endpoint_op.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 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_RESOLVER_ENDPOINT_OP_HPP | |
12 | #define BOOST_ASIO_DETAIL_RESOLVER_ENDPOINT_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 | #include <boost/asio/error.hpp> | |
20 | #include <boost/asio/io_service.hpp> | |
21 | #include <boost/asio/ip/basic_resolver_iterator.hpp> | |
22 | #include <boost/asio/detail/addressof.hpp> | |
23 | #include <boost/asio/detail/bind_handler.hpp> | |
24 | #include <boost/asio/detail/fenced_block.hpp> | |
25 | #include <boost/asio/detail/handler_alloc_helpers.hpp> | |
26 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
27 | #include <boost/asio/detail/operation.hpp> | |
28 | #include <boost/asio/detail/socket_ops.hpp> | |
29 | ||
30 | #include <boost/asio/detail/push_options.hpp> | |
31 | ||
32 | namespace boost { | |
33 | namespace asio { | |
34 | namespace detail { | |
35 | ||
36 | template <typename Protocol, typename Handler> | |
37 | class resolve_endpoint_op : public operation | |
38 | { | |
39 | public: | |
40 | BOOST_ASIO_DEFINE_HANDLER_PTR(resolve_endpoint_op); | |
41 | ||
42 | typedef typename Protocol::endpoint endpoint_type; | |
43 | typedef boost::asio::ip::basic_resolver_iterator<Protocol> iterator_type; | |
44 | ||
45 | resolve_endpoint_op(socket_ops::weak_cancel_token_type cancel_token, | |
46 | const endpoint_type& endpoint, io_service_impl& ios, Handler& handler) | |
47 | : operation(&resolve_endpoint_op::do_complete), | |
48 | cancel_token_(cancel_token), | |
49 | endpoint_(endpoint), | |
50 | io_service_impl_(ios), | |
51 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) | |
52 | { | |
53 | } | |
54 | ||
55 | static void do_complete(io_service_impl* owner, operation* base, | |
56 | const boost::system::error_code& /*ec*/, | |
57 | std::size_t /*bytes_transferred*/) | |
58 | { | |
59 | // Take ownership of the operation object. | |
60 | resolve_endpoint_op* o(static_cast<resolve_endpoint_op*>(base)); | |
61 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
62 | ||
63 | if (owner && owner != &o->io_service_impl_) | |
64 | { | |
65 | // The operation is being run on the worker io_service. Time to perform | |
66 | // the resolver operation. | |
67 | ||
68 | // Perform the blocking endpoint resolution operation. | |
69 | char host_name[NI_MAXHOST]; | |
70 | char service_name[NI_MAXSERV]; | |
71 | socket_ops::background_getnameinfo(o->cancel_token_, o->endpoint_.data(), | |
72 | o->endpoint_.size(), host_name, NI_MAXHOST, service_name, NI_MAXSERV, | |
73 | o->endpoint_.protocol().type(), o->ec_); | |
74 | o->iter_ = iterator_type::create(o->endpoint_, host_name, service_name); | |
75 | ||
76 | // Pass operation back to main io_service for completion. | |
77 | o->io_service_impl_.post_deferred_completion(o); | |
78 | p.v = p.p = 0; | |
79 | } | |
80 | else | |
81 | { | |
82 | // The operation has been returned to the main io_service. The completion | |
83 | // handler is ready to be delivered. | |
84 | ||
85 | BOOST_ASIO_HANDLER_COMPLETION((o)); | |
86 | ||
87 | // Make a copy of the handler so that the memory can be deallocated | |
88 | // before the upcall is made. Even if we're not about to make an upcall, | |
89 | // a sub-object of the handler may be the true owner of the memory | |
90 | // associated with the handler. Consequently, a local copy of the handler | |
91 | // is required to ensure that any owning sub-object remains valid until | |
92 | // after we have deallocated the memory here. | |
93 | detail::binder2<Handler, boost::system::error_code, iterator_type> | |
94 | handler(o->handler_, o->ec_, o->iter_); | |
95 | p.h = boost::asio::detail::addressof(handler.handler_); | |
96 | p.reset(); | |
97 | ||
98 | if (owner) | |
99 | { | |
100 | fenced_block b(fenced_block::half); | |
101 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "...")); | |
102 | boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); | |
103 | BOOST_ASIO_HANDLER_INVOCATION_END; | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | private: | |
109 | socket_ops::weak_cancel_token_type cancel_token_; | |
110 | endpoint_type endpoint_; | |
111 | io_service_impl& io_service_impl_; | |
112 | Handler handler_; | |
113 | boost::system::error_code ec_; | |
114 | iterator_type iter_; | |
115 | }; | |
116 | ||
117 | } // namespace detail | |
118 | } // namespace asio | |
119 | } // namespace boost | |
120 | ||
121 | #include <boost/asio/detail/pop_options.hpp> | |
122 | ||
123 | #endif // BOOST_ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP |