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// // Copyright (c) 2023-2025 Ivica Siladic, Bruno Iljazovic, Korina Simicevic // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt) // #ifndef BOOST_MQTT5_RECONNECT_OP_HPP #define BOOST_MQTT5_RECONNECT_OP_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace boost::mqtt5::detail { class exponential_backoff { int _curr_exp { 0 }; static constexpr int _base_mulptilier = 1000; static constexpr int _max_exp = 4; // sizeof(_generator) = 8 boost::random::rand48 _generator { uint32_t(std::time(0)) }; boost::random::uniform_smallint<> _distribution { -500, 500 }; public: exponential_backoff() = default; duration generate() { int exponent = _curr_exp < _max_exp ? _curr_exp++ : _max_exp; int base = 1 << exponent; return std::chrono::milliseconds( base * _base_mulptilier + _distribution(_generator) /* noise */ ); } }; namespace asio = boost::asio; template class reconnect_op { struct on_locked {}; struct on_next_endpoint {}; struct on_connect {}; struct on_backoff {}; Owner& _owner; using handler_type = asio::any_completion_handler; handler_type _handler; std::unique_ptr _buffer_ptr; exponential_backoff _generator; using endpoint = asio::ip::tcp::endpoint; using epoints = asio::ip::tcp::resolver::results_type; public: template reconnect_op(Owner& owner, Handler&& handler) : _owner(owner), _handler(std::move(handler)) {} reconnect_op(reconnect_op&&) = default; reconnect_op(const reconnect_op&) = delete; reconnect_op& operator=(reconnect_op&&) = default; reconnect_op& operator=(const reconnect_op&) = delete; using allocator_type = asio::associated_allocator_t; allocator_type get_allocator() const noexcept { return asio::get_associated_allocator(_handler); } using cancellation_slot_type = asio::associated_cancellation_slot_t; cancellation_slot_type get_cancellation_slot() const noexcept { return asio::get_associated_cancellation_slot(_handler); } using executor_type = asio::associated_executor_t; executor_type get_executor() const noexcept { return asio::get_associated_executor(_handler); } void perform(typename Owner::stream_ptr s) { _owner._conn_mtx.lock( asio::prepend(std::move(*this), on_locked {}, s) ); } void operator()(on_locked, typename Owner::stream_ptr s, error_code ec) { if (ec == asio::error::operation_aborted) // cancelled without acquiring the lock (by calling client.cancel()) return std::move(_handler)(ec); if (!_owner.is_open()) return complete(asio::error::operation_aborted); if (s != _owner._stream_ptr) return complete(asio::error::try_again); do_reconnect(); } void do_reconnect() { _owner._endpoints.async_next_endpoint( asio::prepend(std::move(*this), on_next_endpoint {}) ); } void backoff_and_reconnect() { _owner._connect_timer.expires_after(_generator.generate()); _owner._connect_timer.async_wait( asio::prepend(std::move(*this), on_backoff {}) ); } void operator()(on_backoff, error_code ec) { if (ec == asio::error::operation_aborted || !_owner.is_open()) return complete(asio::error::operation_aborted); do_reconnect(); } void operator()( on_next_endpoint, error_code ec, epoints eps, authority_path ap ) { // the three error codes below are the only possible codes // that may be returned from async_next_endpont if (ec == asio::error::operation_aborted || !_owner.is_open()) return complete(asio::error::operation_aborted); if (ec == asio::error::try_again) return backoff_and_reconnect(); if (ec == asio::error::host_not_found) return complete(asio::error::no_recovery); connect(eps.cbegin(), std::move(ap)); } void connect(epoints::const_iterator eps, authority_path ap) { namespace asioex = boost::asio::experimental; const auto& ep = eps->endpoint(); auto sptr = _owner.construct_and_open_next_layer(ep.protocol()); if constexpr (has_tls_context) setup_tls_sni( ap, _owner._stream_context.tls_context(), *sptr ); // wait max 5 seconds for the connect (handshake) op to finish _owner._connect_timer.expires_after(std::chrono::seconds(5)); auto init_connect = []( auto handler, typename Owner::stream_type& stream, mqtt_ctx& context, log_invoke& log, endpoint ep, authority_path ap ) { connect_op { stream, context, log, std::move(handler) } .perform(ep, std::move(ap)); }; auto timed_connect = asioex::make_parallel_group( asio::async_initiate( init_connect, asio::deferred, std::ref(*sptr), std::ref(_owner._stream_context.mqtt_context()), std::ref(_owner.log()), ep, ap ), _owner._connect_timer.async_wait(asio::deferred) ); timed_connect.async_wait( asioex::wait_for_one(), asio::prepend( std::move(*this), on_connect {}, std::move(sptr), std::move(eps), std::move(ap) ) ); } void operator()( on_connect, typename Owner::stream_ptr sptr, epoints::const_iterator eps, authority_path ap, std::array ord, error_code connect_ec, error_code timer_ec ) { // connect_ec may be any of: // 1) async_connect error codes // 2) async_handshake (TLS) error codes // 3) async_handshake (WebSocket) error codes // 4) async_write error codes // 5) async_read error codes // 5) client::error::malformed_packet if ( (ord[0] == 0 && connect_ec == asio::error::operation_aborted) || (ord[0] == 1 && timer_ec == asio::error::operation_aborted) || !_owner.is_open() ) return complete(asio::error::operation_aborted); // retry for operation timed out and any other error_code or client::error::malformed_packet if (ord[0] == 1 || connect_ec) { // if the hostname resolved into more endpoints, try the next one if (++eps != epoints::const_iterator()) return connect(std::move(eps), std::move(ap)); // try next server return do_reconnect(); } _owner.replace_next_layer(std::move(sptr)); complete(error_code {}); } private: void complete(error_code ec) { _owner._conn_mtx.unlock(); std::move(_handler)(ec); } }; } // end namespace boost::mqtt5::detail #endif // !BOOST_MQTT5_RECONNECT_OP_HPP