[mqtt-client] user can only async_disconnect with rcs < 0x80, fix async_disconnect ecs

Summary: resolves T12974

Reviewers: ivica

Reviewed By: ivica

Subscribers: miljen, iljazovic

Maniphest Tasks: T12974

Differential Revision: https://repo.mireo.local/D26294

include/async_mqtt5/detail/async_mutex.hpp

@@ -21,7 +21,7 @@ public:
 	using executor_type = asio::any_io_executor;
 private:
 	using queued_op_t = asio::any_completion_handler<
-		void (boost::system::error_code)
+		void (error_code)
 	>;
 	using queue_t = ring_buffer<queued_op_t>;
 
@@ -57,7 +57,7 @@ private:
 			return asio::get_associated_cancellation_slot(_handler);
 		}
 
-		void operator()(boost::system::error_code ec) {
+		void operator()(error_code ec) {
 			std::move(_handler)(ec);
 		}
 	};

include/async_mqtt5/error.hpp

@@ -20,9 +20,15 @@ enum class disconnect_rc_e : std::uint8_t {
 
 	/** The Client wishes to disconnect but requires that
 	 the Server also publishes its Will Message. */
+	disconnect_with_will_message = 0x04
+};
+
+namespace detail {
+
+enum class disconnect_rc_e : std::uint8_t {
+	normal_disconnection = 0x00,
 	disconnect_with_will_message = 0x04,
 
-	// TODO: these reason codes should not be available to the user, only the client
 	unspecified_error = 0x80,
 	malformed_packet = 0x81,
 	protocol_error = 0x82,
@@ -37,6 +43,9 @@ enum class disconnect_rc_e : std::uint8_t {
 	payload_format_invalid = 0x99
 };
 
+}
+
+
 namespace client {
 /**
  * \brief MQTT client error codes.
@@ -44,23 +53,14 @@ namespace client {
  * \details Represents error that occur on the client side. 
  */
 enum class error : int {
-	/** [unused] A fatal error occurred. */
-	fatal_error = 100,
-
 	/// \cond INTERNAL
 	/** Malformed packet has been detected. */
-	malformed_packet,
+	malformed_packet = 100,
 	/// \endcond
 
 	/** There are no more available Packet Identifiers to use. */
 	pid_overrun,
 
-	/** [unused] The Client has reconnected. */
-	reconnected,
-
-	/** [unused] The Client has been disconnected. */
-	disconnected,
-
 	// publish
 	/** The Server does not support the specified \ref qos_e. */
 	qos_not_supported,
@@ -77,16 +77,10 @@ inline std::string client_error_to_string(error err) {
 	using enum error;
 
 	switch (err) {
-		case fatal_error:
-			return "A fatal error occurred";
 		case malformed_packet:
 			return "Malformed packet has been detected";
 		case pid_overrun:
 			return "There are no more available Packet Identifiers to use.";
-		case reconnected:
-			return "The Client has reconnected";
-		case disconnected:
-			return "The Client has been disconnected";
 		case qos_not_supported:
 			return "The Server does not support the specified QoS";
 		case retain_not_available:

include/async_mqtt5/impl/disconnect_op.hpp

@@ -80,14 +80,12 @@ public:
 		// The connection must be closed even
 		// if we failed to send the DISCONNECT packet
 		// with Reason Code of 0x80 or greater.
-		// TODO: what about rc < 0x80?
 
 		if (
 			ec == asio::error::operation_aborted ||
 			ec == asio::error::no_recovery
 		)
-			// TODO: do we need two different errors here?
+			return complete(asio::error::operation_aborted);
-			return complete(ec);
 
 		if (_context.terminal) {
 			_svc_ptr->cancel();
@@ -95,7 +93,7 @@ public:
 		}
 
 		if (ec == asio::error::try_again)
-			return complete(ec);
+			return complete(error_code {});
 
 		_svc_ptr->close_stream();
 		_svc_ptr->open_stream();

include/async_mqtt5/mqtt_client.hpp

@@ -140,7 +140,8 @@ public:
 	 * \details All outstanding operations will complete
 	 * with `boost::asio::error::operation_aborted`.
 	 *
-	 * \attention The Client cannot be used before calling \ref mqtt_client::run again.
+	 * \attention This function has terminal effects and will close the Client.
+	 * The Client cannot be used before calling \ref mqtt_client::run again.
 	 */
 	void cancel() {
 		get_executor().execute([svc_ptr = _svc_ptr]() {
@@ -394,9 +395,9 @@ public:
 	 * \brief Send an \__UNSUBSCRIBE\__ packet to Broker to unsubscribe from one
 	 * or more Topics.
 	 *
-	 * \note The Client MAY receive \__PUBLISH\__ packets with Application
+	 * \note The Client may still receive residual Application Messages
-	 * Messages from Topics the Client just unsubscribed to if
+	 * through the \ref mqtt_client::async_receive function
-	 * they were buffered for delivery on the Broker side beforehand.
+	 * from Topics the Client just unsubscribed to.
 	 *
 	 * \param topics List of Topics to unsubscribe from.
 	 * \param props An instance of \__UNSUBSCRIBE_PROPS\__.
@@ -450,9 +451,9 @@ public:
 	 * \brief Send an \__UNSUBSCRIBE\__ packet to Broker to unsubscribe
 	 * from one Topic.
 	 *
-	 * \note The Client MAY receive \__PUBLISH\__ packets with Application
+	 * \note The Client may still receive residual Application Messages
-	 * Messages from Topics the Client just unsubscribed to if
+	 * through the \ref mqtt_client::async_receive function
-	 * they were buffered for delivery on the Broker side beforehand.
+	 * from Topics the Client just unsubscribed to.
 	 *
 	 * \param topic Topic to unsubscribe from.
 	 * \param props An instance of \__UNSUBSCRIBE_PROPS\__.
@@ -539,7 +540,8 @@ public:
 	 * \details Send a \__DISCONNECT\__ packet to the Broker with a Reason Code
 	 * describing the reason for disconnection.
 	 *
-	 * \attention This function will close the Client. See \ref mqtt_client::cancel.
+	 * \attention This function has terminal effects and will close the Client.
+	 * See \ref mqtt_client::cancel.
 	 *
 	 * \param reason_code Reason Code to notify
 	 * the Broker of the reason for disconnection.
@@ -559,7 +561,6 @@ public:
 	 *	The list of all possible error codes that this operation can finish with:\n
 	 *		- `boost::system::errc::errc_t::success`\n
 	 *		- `boost::asio::error::operation_aborted`\n
-	 *		- `boost::asio::no_recovery`\n
 	 *
 	 * Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
 	 */
@@ -569,7 +570,8 @@ public:
 		CompletionToken&& token
 	) {
 		return detail::async_disconnect(
-			reason_code, props, true, _svc_ptr,
+			detail::disconnect_rc_e(static_cast<uint8_t>(reason_code)),
+			props, true, _svc_ptr,
 			std::forward<CompletionToken>(token)
 		);
 	}
@@ -581,7 +583,8 @@ public:
 	 * \ref reason_codes::normal_disconnection describing
 	 * the reason for disconnection.
 	 *
-	 * \attention This function will close the Client. See \ref mqtt_client::cancel.
+	 * \attention This function has terminal effects and will close the Client.
+	 * See \ref mqtt_client::cancel.
 	 *
 	 * \param token Completion token that will be used to produce a
 	 * completion handler, which will be called when the operation completed.
@@ -598,7 +601,6 @@ public:
 	 *	The list of all possible error codes that this operation can finish with:\n
 	 *		- `boost::system::errc::errc_t::success`\n
 	 *		- `boost::asio::error::operation_aborted`\n
-	 *		- `boost::asio::no_recovery`\n
 	 *
 	 * Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
 	 */