1 | // |
2 | // detail/resolve_endpoint_op.hpp |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
4 | // |
5 | // Copyright (c) 2003-2015 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(cancel_token: o->cancel_token_, addr: o->endpoint_.data(), |
72 | addrlen: o->endpoint_.size(), host: host_name, NI_MAXHOST, serv: service_name, NI_MAXSERV, |
73 | sock_type: o->endpoint_.protocol().type(), ec&: 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 |
124 | |