142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
//
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// detail/resolve_endpoint_op.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
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#define ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/detail/bind_handler.hpp"
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#include "asio/detail/fenced_block.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/detail/handler_invoke_helpers.hpp"
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#include "asio/detail/handler_work.hpp"
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#include "asio/detail/memory.hpp"
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#include "asio/detail/resolve_op.hpp"
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#include "asio/detail/socket_ops.hpp"
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#include "asio/error.hpp"
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#include "asio/ip/basic_resolver_results.hpp"
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#if defined(ASIO_HAS_IOCP)
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# include "asio/detail/win_iocp_io_context.hpp"
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#else // defined(ASIO_HAS_IOCP)
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# include "asio/detail/scheduler.hpp"
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#endif // defined(ASIO_HAS_IOCP)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename Protocol, typename Handler, typename IoExecutor>
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class resolve_endpoint_op : public resolve_op
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{
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public:
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ASIO_DEFINE_HANDLER_PTR(resolve_endpoint_op);
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typedef typename Protocol::endpoint endpoint_type;
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typedef asio::ip::basic_resolver_results<Protocol> results_type;
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#if defined(ASIO_HAS_IOCP)
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typedef class win_iocp_io_context scheduler_impl;
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#else
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typedef class scheduler scheduler_impl;
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#endif
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resolve_endpoint_op(socket_ops::weak_cancel_token_type cancel_token,
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const endpoint_type& endpoint, scheduler_impl& sched,
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Handler& handler, const IoExecutor& io_ex)
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: resolve_op(&resolve_endpoint_op::do_complete),
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cancel_token_(cancel_token),
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endpoint_(endpoint),
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scheduler_(sched),
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handler_(ASIO_MOVE_CAST(Handler)(handler)),
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work_(handler_, io_ex)
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{
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}
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static void do_complete(void* owner, operation* base,
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const asio::error_code& /*ec*/,
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std::size_t /*bytes_transferred*/)
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{
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// Take ownership of the operation object.
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ASIO_ASSUME(base != 0);
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resolve_endpoint_op* o(static_cast<resolve_endpoint_op*>(base));
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ptr p = { asio::detail::addressof(o->handler_), o, o };
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if (owner && owner != &o->scheduler_)
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{
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// The operation is being run on the worker io_context. Time to perform
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// the resolver operation.
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// Perform the blocking endpoint resolution operation.
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char host_name[NI_MAXHOST] = "";
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char service_name[NI_MAXSERV] = "";
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socket_ops::background_getnameinfo(o->cancel_token_, o->endpoint_.data(),
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o->endpoint_.size(), host_name, NI_MAXHOST, service_name, NI_MAXSERV,
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o->endpoint_.protocol().type(), o->ec_);
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o->results_ = results_type::create(o->endpoint_, host_name, service_name);
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// Pass operation back to main io_context for completion.
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o->scheduler_.post_deferred_completion(o);
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p.v = p.p = 0;
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}
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else
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{
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// The operation has been returned to the main io_context. The completion
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// handler is ready to be delivered.
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ASIO_HANDLER_COMPLETION((*o));
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// Take ownership of the operation's outstanding work.
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handler_work<Handler, IoExecutor> w(
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ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
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o->work_));
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// Make a copy of the handler so that the memory can be deallocated
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// before the upcall is made. Even if we're not about to make an upcall,
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// a sub-object of the handler may be the true owner of the memory
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// associated with the handler. Consequently, a local copy of the handler
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// is required to ensure that any owning sub-object remains valid until
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// after we have deallocated the memory here.
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detail::binder2<Handler, asio::error_code, results_type>
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handler(o->handler_, o->ec_, o->results_);
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p.h = asio::detail::addressof(handler.handler_);
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p.reset();
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if (owner)
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{
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fenced_block b(fenced_block::half);
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ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
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w.complete(handler, handler.handler_);
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ASIO_HANDLER_INVOCATION_END;
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}
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}
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}
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private:
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socket_ops::weak_cancel_token_type cancel_token_;
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endpoint_type endpoint_;
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scheduler_impl& scheduler_;
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Handler handler_;
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handler_work<Handler, IoExecutor> work_;
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results_type results_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
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