include/boost/corosio/native/native_resolver.hpp

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native_resolver.hpp

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1		//
2		// Copyright (c) 2026 Steve Gerbino
3		// Copyright (c) 2026 Michael Vandeberg
4		//
5		// Distributed under the Boost Software License, Version 1.0. (See accompanying
6		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7		//
8		// Official repository: https://github.com/cppalliance/corosio
9		//
10
11		#ifndef BOOST_COROSIO_NATIVE_NATIVE_RESOLVER_HPP
12		#define BOOST_COROSIO_NATIVE_NATIVE_RESOLVER_HPP
13
14		#include <boost/corosio/resolver.hpp>
15		#include <boost/corosio/backend.hpp>
16		#include <boost/corosio/detail/op_base.hpp>
17
18		#ifndef BOOST_COROSIO_MRDOCS
19		#if BOOST_COROSIO_HAS_EPOLL \|\| BOOST_COROSIO_HAS_SELECT \|\| \
20		BOOST_COROSIO_HAS_KQUEUE
21		#include <boost/corosio/native/detail/posix/posix_resolver_service.hpp>
22		#endif
23
24		#if BOOST_COROSIO_HAS_IOCP
25		#include <boost/corosio/native/detail/iocp/win_resolver_service.hpp>
26		#endif
27		#endif // !BOOST_COROSIO_MRDOCS
28
29		namespace boost::corosio {
30
31		/** An asynchronous DNS resolver with devirtualized operations.
32
33		This class template inherits from @ref resolver and shadows
34		the `resolve` operations with versions that call the backend
35		implementation directly, allowing the compiler to inline
36		through the entire call chain.
37
38		Non-async operations (`cancel`) remain unchanged and dispatch
39		through the compiled library.
40
41		A `native_resolver` IS-A `resolver` and can be passed to any
42		function expecting `resolver&`.
43
44		@tparam Backend A backend tag value (e.g., `epoll`).
45
46		@par Thread Safety
47		Same as @ref resolver.
48
49		@see resolver, epoll_t, iocp_t
50		*/
51		template<auto Backend>
52		class native_resolver : public resolver
53		{
54		using backend_type = decltype(Backend);
55		using impl_type = typename backend_type::resolver_type;
56
57	2x	impl_type& get_impl() noexcept
58		{
59	2x	return static_cast<impl_type>(h_.get());
60		}
61
62		struct native_resolve_awaitable
63		: detail::value_op_base<native_resolve_awaitable, std::vector<endpoint>>
64		{
65		native_resolver& self_;
66		std::string host_;
67		std::string service_;
68		resolve_flags flags_;
69
70	4x	native_resolve_awaitable(
71		native_resolver& self,
72		std::string_view host,
73		std::string_view service,
74		resolve_flags flags) noexcept
75	4x	: self_(self)
76	8x	, host_(host)
77	8x	, service_(service)
78	4x	, flags_(flags)
79		{
80	4x	}
81
82		std::coroutine_handle<>
83	2x	dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
84		{
85	6x	return self_.get_impl().resolve(
86	2x	h, ex, host_, service_, flags_, this->token_, &this->ec_,
87	4x	&this->value_);
88		}
89		};
90
91		struct native_reverse_awaitable
92		: detail::value_op_base<native_reverse_awaitable, endpoint_name>
93		{
94		native_resolver& self_;
95		endpoint ep_;
96		reverse_flags flags_;
97
98		native_reverse_awaitable(
99		native_resolver& self,
100		endpoint const& ep,
101		reverse_flags flags) noexcept
102		: self_(self)
103		, ep_(ep)
104		, flags_(flags)
105		{
106		}
107
108		std::coroutine_handle<>
109		dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
110		{
111		return self_.get_impl().reverse_resolve(
112		h, ex, ep_, flags_, this->token_, &this->ec_, &this->value_);
113		}
114		};
115
116		public:
117		/** Construct a native resolver from an execution context.
118
119		@param ctx The execution context that will own this resolver.
120		*/
121	8x	explicit native_resolver(capy::execution_context& ctx) : resolver(ctx) {}
122
123		/** Construct a native resolver from an executor.
124
125		@param ex The executor whose context will own the resolver.
126		*/
127		template<class Ex>
128		requires(!std::same_as<std::remove_cvref_t<Ex>, native_resolver>) &&
129		capy::Executor<Ex>
130		explicit native_resolver(Ex const& ex) : native_resolver(ex.context())
131		{
132		}
133
134		/** Move construct.
135
136		@pre No awaitables returned by @p other's `resolve` methods
137		exist.
138		@pre The execution context associated with @p other must
139		outlive this resolver.
140		*/
141		native_resolver(native_resolver&&) noexcept = default;
142
143		/** Move assign.
144
145		@pre No awaitables returned by either `*this` or the source's
146		`resolve` methods exist.
147		@pre The execution context associated with the source must
148		outlive this resolver.
149		*/
150		native_resolver& operator=(native_resolver&&) noexcept = default;
151
152		native_resolver(native_resolver const&) = delete;
153		native_resolver& operator=(native_resolver const&) = delete;
154
155		/** Asynchronously resolve a host and service to endpoints.
156
157		Calls the backend implementation directly, bypassing virtual
158		dispatch. Otherwise identical to @ref resolver::resolve.
159
160		This resolver must outlive the returned awaitable.
161
162		@param host The host name or address string.
163		@param service The service name or port string.
164
165		@return An awaitable yielding `io_result<std::vector<endpoint>>`.
166		*/
167	4x	[[nodiscard]] auto resolve(std::string_view host, std::string_view service)
168		{
169		return native_resolve_awaitable(
170	4x	*this, host, service, resolve_flags::none);
171		}
172
173		/** Asynchronously resolve a host and service with flags.
174
175		This resolver must outlive the returned awaitable.
176
177		@param host The host name or address string.
178		@param service The service name or port string.
179		@param flags Flags controlling resolution behavior.
180
181		@return An awaitable yielding
182		`io_result<std::vector<endpoint>>`.
183		*/
184		[[nodiscard]] auto resolve(
185		std::string_view host, std::string_view service, resolve_flags flags)
186		{
187		return native_resolve_awaitable(*this, host, service, flags);
188		}
189
190		/** Asynchronously reverse-resolve an endpoint.
191
192		Calls the backend implementation directly, bypassing virtual
193		dispatch. Otherwise identical to the endpoint overload of
194		@ref resolver::resolve.
195
196		This resolver must outlive the returned awaitable.
197
198		@param ep The endpoint to resolve.
199
200		@return An awaitable yielding
201		`io_result<endpoint_name>`.
202		*/
203		[[nodiscard]] auto resolve(endpoint const& ep)
204		{
205		return native_reverse_awaitable(*this, ep, reverse_flags::none);
206		}
207
208		/** Asynchronously reverse-resolve an endpoint with flags.
209
210		This resolver must outlive the returned awaitable.
211
212		@param ep The endpoint to resolve.
213		@param flags Flags controlling resolution behavior.
214
215		@return An awaitable yielding
216		`io_result<endpoint_name>`.
217		*/
218		[[nodiscard]] auto resolve(endpoint const& ep, reverse_flags flags)
219		{
220		return native_reverse_awaitable(*this, ep, flags);
221		}
222		};
223
224		} // namespace boost::corosio
225
226		#endif
227