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https://github.com/boostorg/mqtt5.git
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d78fdd3208
Summary: * per-operation cancellation changed: total/partial signals only prevent further resending, terminal signal cancels the whole client Reviewers: ivica Reviewed By: ivica Subscribers: korina Differential Revision: https://repo.mireo.local/D27246
123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
#ifndef ASYNC_MQTT5_READ_OP_HPP
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#define ASYNC_MQTT5_READ_OP_HPP
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#include <boost/asio/deferred.hpp>
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#include <boost/asio/post.hpp>
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#include <boost/asio/prepend.hpp>
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#include <boost/asio/experimental/parallel_group.hpp>
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#include <async_mqtt5/detail/internal_types.hpp>
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namespace async_mqtt5::detail {
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namespace asio = boost::asio;
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namespace asioex = boost::asio::experimental;
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template <typename Owner, typename Handler>
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class read_op {
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struct on_read {};
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struct on_reconnect {};
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Owner& _owner;
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using handler_type = Handler;
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handler_type _handler;
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public:
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read_op(Owner& owner, Handler&& handler) :
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_owner(owner),
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_handler(std::move(handler))
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{}
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read_op(read_op&&) noexcept = default;
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read_op(const read_op&) = delete;
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using executor_type = asio::associated_executor_t<handler_type>;
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executor_type get_executor() const noexcept {
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return asio::get_associated_executor(_handler);
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}
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using allocator_type = asio::associated_allocator_t<handler_type>;
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allocator_type get_allocator() const noexcept {
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return asio::get_associated_allocator(_handler);
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}
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template <typename BufferType>
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void perform(
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const BufferType& buffer, duration wait_for
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) {
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auto stream_ptr = _owner._stream_ptr;
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if (_owner.was_connected()) {
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_owner._read_timer.expires_from_now(wait_for);
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auto timed_read = asioex::make_parallel_group(
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stream_ptr->async_read_some(buffer, asio::deferred),
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_owner._read_timer.async_wait(asio::deferred)
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);
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timed_read.async_wait(
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asioex::wait_for_one(),
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asio::prepend(std::move(*this), on_read {}, stream_ptr)
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);
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}
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else
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asio::post(
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_owner.get_executor(),
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asio::prepend(
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std::move(*this), on_read {}, stream_ptr,
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std::array<size_t, 2> { 0, 1 },
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asio::error::not_connected, 0, error_code {}
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)
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);
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}
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void operator()(
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on_read, typename Owner::stream_ptr stream_ptr,
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std::array<std::size_t, 2> ord, error_code read_ec, size_t bytes_read,
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error_code
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) {
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if (!_owner.is_open())
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return complete(asio::error::operation_aborted, bytes_read);
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error_code ec = ord[0] == 1 ? asio::error::timed_out : read_ec;
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bytes_read = ord[0] == 0 ? bytes_read : 0;
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if (!ec)
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return complete(ec, bytes_read);
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// websocket returns operation_aborted if disconnected
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if (should_reconnect(ec) || ec == asio::error::operation_aborted)
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return _owner.async_reconnect(
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stream_ptr, asio::prepend(std::move(*this), on_reconnect {})
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);
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return complete(asio::error::no_recovery, bytes_read);
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}
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void operator()(on_reconnect, error_code ec) {
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if ((ec == asio::error::operation_aborted && _owner.is_open()) || !ec)
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ec = asio::error::try_again;
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return complete(ec, 0);
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}
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private:
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void complete(error_code ec, size_t bytes_read) {
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std::move(_handler)(ec, bytes_read);
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}
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static bool should_reconnect(error_code ec) {
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using namespace asio::error;
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return ec == connection_aborted || ec == not_connected ||
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ec == timed_out || ec == connection_reset ||
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ec == broken_pipe || ec == asio::error::eof;
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}
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};
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} // end namespace async_mqtt5::detail
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#endif // !ASYNC_MQTT5_READ_OP_HPP
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