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+//
+// detail/reactive_socket_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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_REACTIVE_SOCKET_SERVICE_HPP
+#define ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if !defined(ASIO_HAS_IOCP)
+
+#include "asio/buffer.hpp"
+#include "asio/error.hpp"
+#include "asio/execution_context.hpp"
+#include "asio/socket_base.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/reactive_null_buffers_op.hpp"
+#include "asio/detail/reactive_socket_accept_op.hpp"
+#include "asio/detail/reactive_socket_connect_op.hpp"
+#include "asio/detail/reactive_socket_recvfrom_op.hpp"
+#include "asio/detail/reactive_socket_sendto_op.hpp"
+#include "asio/detail/reactive_socket_service_base.hpp"
+#include "asio/detail/reactor.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/socket_holder.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class reactive_socket_service :
+ public execution_context_service_base<reactive_socket_service<Protocol> >,
+ public reactive_socket_service_base
+{
+public:
+ // The protocol type.
+ typedef Protocol protocol_type;
+
+ // The endpoint type.
+ typedef typename Protocol::endpoint endpoint_type;
+
+ // The native type of a socket.
+ typedef socket_type native_handle_type;
+
+ // The implementation type of the socket.
+ struct implementation_type :
+ reactive_socket_service_base::base_implementation_type
+ {
+ // Default constructor.
+ implementation_type()
+ : protocol_(endpoint_type().protocol())
+ {
+ }
+
+ // The protocol associated with the socket.
+ protocol_type protocol_;
+ };
+
+ // Constructor.
+ reactive_socket_service(execution_context& context)
+ : execution_context_service_base<
+ reactive_socket_service<Protocol> >(context),
+ reactive_socket_service_base(context)
+ {
+ }
+
+ // Destroy all user-defined handler objects owned by the service.
+ void shutdown()
+ {
+ this->base_shutdown();
+ }
+
+ // Move-construct a new socket implementation.
+ void move_construct(implementation_type& impl,
+ implementation_type& other_impl) ASIO_NOEXCEPT
+ {
+ this->base_move_construct(impl, other_impl);
+
+ impl.protocol_ = other_impl.protocol_;
+ other_impl.protocol_ = endpoint_type().protocol();
+ }
+
+ // Move-assign from another socket implementation.
+ void move_assign(implementation_type& impl,
+ reactive_socket_service_base& other_service,
+ implementation_type& other_impl)
+ {
+ this->base_move_assign(impl, other_service, other_impl);
+
+ impl.protocol_ = other_impl.protocol_;
+ other_impl.protocol_ = endpoint_type().protocol();
+ }
+
+ // Move-construct a new socket implementation from another protocol type.
+ template <typename Protocol1>
+ void converting_move_construct(implementation_type& impl,
+ reactive_socket_service<Protocol1>&,
+ typename reactive_socket_service<
+ Protocol1>::implementation_type& other_impl)
+ {
+ this->base_move_construct(impl, other_impl);
+
+ impl.protocol_ = protocol_type(other_impl.protocol_);
+ other_impl.protocol_ = typename Protocol1::endpoint().protocol();
+ }
+
+ // Open a new socket implementation.
+ asio::error_code open(implementation_type& impl,
+ const protocol_type& protocol, asio::error_code& ec)
+ {
+ if (!do_open(impl, protocol.family(),
+ protocol.type(), protocol.protocol(), ec))
+ impl.protocol_ = protocol;
+ return ec;
+ }
+
+ // Assign a native socket to a socket implementation.
+ asio::error_code assign(implementation_type& impl,
+ const protocol_type& protocol, const native_handle_type& native_socket,
+ asio::error_code& ec)
+ {
+ if (!do_assign(impl, protocol.type(), native_socket, ec))
+ impl.protocol_ = protocol;
+ return ec;
+ }
+
+ // Get the native socket representation.
+ native_handle_type native_handle(implementation_type& impl)
+ {
+ return impl.socket_;
+ }
+
+ // Bind the socket to the specified local endpoint.
+ asio::error_code bind(implementation_type& impl,
+ const endpoint_type& endpoint, asio::error_code& ec)
+ {
+ socket_ops::bind(impl.socket_, endpoint.data(), endpoint.size(), ec);
+ return ec;
+ }
+
+ // Set a socket option.
+ template <typename Option>
+ asio::error_code set_option(implementation_type& impl,
+ const Option& option, asio::error_code& ec)
+ {
+ socket_ops::setsockopt(impl.socket_, impl.state_,
+ option.level(impl.protocol_), option.name(impl.protocol_),
+ option.data(impl.protocol_), option.size(impl.protocol_), ec);
+ return ec;
+ }
+
+ // Set a socket option.
+ template <typename Option>
+ asio::error_code get_option(const implementation_type& impl,
+ Option& option, asio::error_code& ec) const
+ {
+ std::size_t size = option.size(impl.protocol_);
+ socket_ops::getsockopt(impl.socket_, impl.state_,
+ option.level(impl.protocol_), option.name(impl.protocol_),
+ option.data(impl.protocol_), &size, ec);
+ if (!ec)
+ option.resize(impl.protocol_, size);
+ return ec;
+ }
+
+ // Get the local endpoint.
+ endpoint_type local_endpoint(const implementation_type& impl,
+ asio::error_code& ec) const
+ {
+ endpoint_type endpoint;
+ std::size_t addr_len = endpoint.capacity();
+ if (socket_ops::getsockname(impl.socket_, endpoint.data(), &addr_len, ec))
+ return endpoint_type();
+ endpoint.resize(addr_len);
+ return endpoint;
+ }
+
+ // Get the remote endpoint.
+ endpoint_type remote_endpoint(const implementation_type& impl,
+ asio::error_code& ec) const
+ {
+ endpoint_type endpoint;
+ std::size_t addr_len = endpoint.capacity();
+ if (socket_ops::getpeername(impl.socket_,
+ endpoint.data(), &addr_len, false, ec))
+ return endpoint_type();
+ endpoint.resize(addr_len);
+ return endpoint;
+ }
+
+ // Disable sends or receives on the socket.
+ asio::error_code shutdown(base_implementation_type& impl,
+ socket_base::shutdown_type what, asio::error_code& ec)
+ {
+ socket_ops::shutdown(impl.socket_, what, ec);
+ return ec;
+ }
+
+ // Send a datagram to the specified endpoint. Returns the number of bytes
+ // sent.
+ template <typename ConstBufferSequence>
+ size_t send_to(implementation_type& impl, const ConstBufferSequence& buffers,
+ const endpoint_type& destination, socket_base::message_flags flags,
+ asio::error_code& ec)
+ {
+ typedef buffer_sequence_adapter<asio::const_buffer,
+ ConstBufferSequence> bufs_type;
+
+ if (bufs_type::is_single_buffer)
+ {
+ return socket_ops::sync_sendto1(impl.socket_, impl.state_,
+ bufs_type::first(buffers).data(),
+ bufs_type::first(buffers).size(), flags,
+ destination.data(), destination.size(), ec);
+ }
+ else
+ {
+ bufs_type bufs(buffers);
+ return socket_ops::sync_sendto(impl.socket_, impl.state_,
+ bufs.buffers(), bufs.count(), flags,
+ destination.data(), destination.size(), ec);
+ }
+ }
+
+ // Wait until data can be sent without blocking.
+ size_t send_to(implementation_type& impl, const null_buffers&,
+ const endpoint_type&, socket_base::message_flags,
+ asio::error_code& ec)
+ {
+ // Wait for socket to become ready.
+ socket_ops::poll_write(impl.socket_, impl.state_, -1, ec);
+
+ return 0;
+ }
+
+ // Start an asynchronous send. The data being sent must be valid for the
+ // lifetime of the asynchronous operation.
+ template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
+ void async_send_to(implementation_type& impl,
+ const ConstBufferSequence& buffers,
+ const endpoint_type& destination, socket_base::message_flags flags,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_socket_sendto_op<ConstBufferSequence,
+ endpoint_type, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, impl.socket_,
+ buffers, destination, flags, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::write_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_send_to"));
+
+ start_op(impl, reactor::write_op, p.p, is_continuation, true, false);
+ p.v = p.p = 0;
+ }
+
+ // Start an asynchronous wait until data can be sent without blocking.
+ template <typename Handler, typename IoExecutor>
+ void async_send_to(implementation_type& impl, const null_buffers&,
+ const endpoint_type&, socket_base::message_flags,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_null_buffers_op<Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::write_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_send_to(null_buffers)"));
+
+ start_op(impl, reactor::write_op, p.p, is_continuation, false, false);
+ p.v = p.p = 0;
+ }
+
+ // Receive a datagram with the endpoint of the sender. Returns the number of
+ // bytes received.
+ template <typename MutableBufferSequence>
+ size_t receive_from(implementation_type& impl,
+ const MutableBufferSequence& buffers,
+ endpoint_type& sender_endpoint, socket_base::message_flags flags,
+ asio::error_code& ec)
+ {
+ typedef buffer_sequence_adapter<asio::mutable_buffer,
+ MutableBufferSequence> bufs_type;
+
+ std::size_t addr_len = sender_endpoint.capacity();
+ std::size_t bytes_recvd;
+ if (bufs_type::is_single_buffer)
+ {
+ bytes_recvd = socket_ops::sync_recvfrom1(impl.socket_,
+ impl.state_, bufs_type::first(buffers).data(),
+ bufs_type::first(buffers).size(), flags,
+ sender_endpoint.data(), &addr_len, ec);
+ }
+ else
+ {
+ bufs_type bufs(buffers);
+ bytes_recvd = socket_ops::sync_recvfrom(
+ impl.socket_, impl.state_, bufs.buffers(), bufs.count(),
+ flags, sender_endpoint.data(), &addr_len, ec);
+ }
+
+ if (!ec)
+ sender_endpoint.resize(addr_len);
+
+ return bytes_recvd;
+ }
+
+ // Wait until data can be received without blocking.
+ size_t receive_from(implementation_type& impl, const null_buffers&,
+ endpoint_type& sender_endpoint, socket_base::message_flags,
+ asio::error_code& ec)
+ {
+ // Wait for socket to become ready.
+ socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
+
+ // Reset endpoint since it can be given no sensible value at this time.
+ sender_endpoint = endpoint_type();
+
+ return 0;
+ }
+
+ // Start an asynchronous receive. The buffer for the data being received and
+ // the sender_endpoint object must both be valid for the lifetime of the
+ // asynchronous operation.
+ template <typename MutableBufferSequence,
+ typename Handler, typename IoExecutor>
+ void async_receive_from(implementation_type& impl,
+ const MutableBufferSequence& buffers, endpoint_type& sender_endpoint,
+ socket_base::message_flags flags, Handler& handler,
+ const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_socket_recvfrom_op<MutableBufferSequence,
+ endpoint_type, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ int protocol = impl.protocol_.type();
+ p.p = new (p.v) op(success_ec_, impl.socket_, protocol,
+ buffers, sender_endpoint, flags, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::read_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_receive_from"));
+
+ start_op(impl,
+ (flags & socket_base::message_out_of_band)
+ ? reactor::except_op : reactor::read_op,
+ p.p, is_continuation, true, false);
+ p.v = p.p = 0;
+ }
+
+ // Wait until data can be received without blocking.
+ template <typename Handler, typename IoExecutor>
+ void async_receive_from(implementation_type& impl, const null_buffers&,
+ endpoint_type& sender_endpoint, socket_base::message_flags flags,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_null_buffers_op<Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::read_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_receive_from(null_buffers)"));
+
+ // Reset endpoint since it can be given no sensible value at this time.
+ sender_endpoint = endpoint_type();
+
+ start_op(impl,
+ (flags & socket_base::message_out_of_band)
+ ? reactor::except_op : reactor::read_op,
+ p.p, is_continuation, false, false);
+ p.v = p.p = 0;
+ }
+
+ // Accept a new connection.
+ template <typename Socket>
+ asio::error_code accept(implementation_type& impl,
+ Socket& peer, endpoint_type* peer_endpoint, asio::error_code& ec)
+ {
+ // We cannot accept a socket that is already open.
+ if (peer.is_open())
+ {
+ ec = asio::error::already_open;
+ return ec;
+ }
+
+ std::size_t addr_len = peer_endpoint ? peer_endpoint->capacity() : 0;
+ socket_holder new_socket(socket_ops::sync_accept(impl.socket_,
+ impl.state_, peer_endpoint ? peer_endpoint->data() : 0,
+ peer_endpoint ? &addr_len : 0, ec));
+
+ // On success, assign new connection to peer socket object.
+ if (new_socket.get() != invalid_socket)
+ {
+ if (peer_endpoint)
+ peer_endpoint->resize(addr_len);
+ peer.assign(impl.protocol_, new_socket.get(), ec);
+ if (!ec)
+ new_socket.release();
+ }
+
+ return ec;
+ }
+
+ // Start an asynchronous accept. The peer and peer_endpoint objects must be
+ // valid until the accept's handler is invoked.
+ template <typename Socket, typename Handler, typename IoExecutor>
+ void async_accept(implementation_type& impl, Socket& peer,
+ endpoint_type* peer_endpoint, Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_socket_accept_op<Socket, Protocol, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, impl.socket_, impl.state_,
+ peer, impl.protocol_, peer_endpoint, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected() && !peer.is_open())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::read_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_accept"));
+
+ start_accept_op(impl, p.p, is_continuation, peer.is_open());
+ p.v = p.p = 0;
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ // Start an asynchronous accept. The peer_endpoint object must be valid until
+ // the accept's handler is invoked.
+ template <typename PeerIoExecutor, typename Handler, typename IoExecutor>
+ void async_move_accept(implementation_type& impl,
+ const PeerIoExecutor& peer_io_ex, endpoint_type* peer_endpoint,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_socket_move_accept_op<Protocol,
+ PeerIoExecutor, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, peer_io_ex, impl.socket_,
+ impl.state_, impl.protocol_, peer_endpoint, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::read_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_accept"));
+
+ start_accept_op(impl, p.p, is_continuation, false);
+ p.v = p.p = 0;
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ // Connect the socket to the specified endpoint.
+ asio::error_code connect(implementation_type& impl,
+ const endpoint_type& peer_endpoint, asio::error_code& ec)
+ {
+ socket_ops::sync_connect(impl.socket_,
+ peer_endpoint.data(), peer_endpoint.size(), ec);
+ return ec;
+ }
+
+ // Start an asynchronous connect.
+ template <typename Handler, typename IoExecutor>
+ void async_connect(implementation_type& impl,
+ const endpoint_type& peer_endpoint,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_socket_connect_op<Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, impl.socket_, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.socket_, reactor::connect_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
+ &impl, impl.socket_, "async_connect"));
+
+ start_connect_op(impl, p.p, is_continuation,
+ peer_endpoint.data(), peer_endpoint.size());
+ p.v = p.p = 0;
+ }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // !defined(ASIO_HAS_IOCP)
+
+#endif // ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_HPP