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//
// detail/resolve_endpoint_op.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
#define ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/error.hpp"
#include "asio/io_context.hpp"
#include "asio/ip/basic_resolver_results.hpp"
#include "asio/detail/bind_handler.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/resolve_op.hpp"
#include "asio/detail/socket_ops.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Protocol, typename Handler>
class resolve_endpoint_op : public resolve_op
{
public:
ASIO_DEFINE_HANDLER_PTR(resolve_endpoint_op);
typedef typename Protocol::endpoint endpoint_type;
typedef asio::ip::basic_resolver_results<Protocol> results_type;
resolve_endpoint_op(socket_ops::weak_cancel_token_type cancel_token,
const endpoint_type& endpoint, io_context_impl& ioc, Handler& handler)
: resolve_op(&resolve_endpoint_op::do_complete),
cancel_token_(cancel_token),
endpoint_(endpoint),
io_context_impl_(ioc),
handler_(ASIO_MOVE_CAST(Handler)(handler))
{
handler_work<Handler>::start(handler_);
}
static void do_complete(void* owner, operation* base,
const asio::error_code& /*ec*/,
std::size_t /*bytes_transferred*/)
{
// Take ownership of the operation object.
resolve_endpoint_op* o(static_cast<resolve_endpoint_op*>(base));
ptr p = { asio::detail::addressof(o->handler_), o, o };
handler_work<Handler> w(o->handler_);
if (owner && owner != &o->io_context_impl_)
{
// The operation is being run on the worker io_context. Time to perform
// the resolver operation.
// Perform the blocking endpoint resolution operation.
char host_name[NI_MAXHOST];
char service_name[NI_MAXSERV];
socket_ops::background_getnameinfo(o->cancel_token_, o->endpoint_.data(),
o->endpoint_.size(), host_name, NI_MAXHOST, service_name, NI_MAXSERV,
o->endpoint_.protocol().type(), o->ec_);
o->results_ = results_type::create(o->endpoint_, host_name, service_name);
// Pass operation back to main io_context for completion.
o->io_context_impl_.post_deferred_completion(o);
p.v = p.p = 0;
}
else
{
// The operation has been returned to the main io_context. The completion
// handler is ready to be delivered.
ASIO_HANDLER_COMPLETION((*o));
// Make a copy of the handler so that the memory can be deallocated
// before the upcall is made. Even if we're not about to make an upcall,
// a sub-object of the handler may be the true owner of the memory
// associated with the handler. Consequently, a local copy of the handler
// is required to ensure that any owning sub-object remains valid until
// after we have deallocated the memory here.
detail::binder2<Handler, asio::error_code, results_type>
handler(o->handler_, o->ec_, o->results_);
p.h = asio::detail::addressof(handler.handler_);
p.reset();
if (owner)
{
fenced_block b(fenced_block::half);
ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
w.complete(handler, handler.handler_);
ASIO_HANDLER_INVOCATION_END;
}
}
}
private:
socket_ops::weak_cancel_token_type cancel_token_;
endpoint_type endpoint_;
io_context_impl& io_context_impl_;
Handler handler_;
results_type results_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
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