mirror of
https://github.com/boostorg/mqtt5.git
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7e60e7a919
Summary: - Relates to T12899 - TODO: support re-authentication Reviewers: ivica Reviewed By: ivica Subscribers: korina Maniphest Tasks: T12899 Differential Revision: https://repo.mireo.local/D26327
684 lines
22 KiB
C++
684 lines
22 KiB
C++
#ifndef ASYNC_MQTT5_MQTT_CLIENT_HPP
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#define ASYNC_MQTT5_MQTT_CLIENT_HPP
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#include <boost/system/error_code.hpp>
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#include <async_mqtt5/error.hpp>
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#include <async_mqtt5/types.hpp>
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#include <async_mqtt5/impl/client_service.hpp>
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#include <async_mqtt5/impl/publish_send_op.hpp>
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#include <async_mqtt5/impl/read_message_op.hpp>
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#include <async_mqtt5/impl/subscribe_op.hpp>
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#include <async_mqtt5/impl/unsubscribe_op.hpp>
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namespace async_mqtt5 {
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namespace asio = boost::asio;
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/**
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* \brief \__MQTT\__ client used to connect and communicate with a Broker.
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*
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* \tparam \__StreamType\__ Type of the underlying transport protocol used to transfer
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* the stream of bytes between the Client and the Broker. The transport must be
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* ordered and lossless.
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* \tparam \__TlsContext\__ Type of the context object used in TLS/SSL connections.
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*/
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template <
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typename StreamType,
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typename TlsContext = std::monostate
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>
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class mqtt_client {
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public:
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/// The executor type associated with the client.
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using executor_type = typename StreamType::executor_type;
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private:
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using stream_type = StreamType;
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using tls_context_type = TlsContext;
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static constexpr auto read_timeout = std::chrono::seconds(5);
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using client_service_type = detail::client_service<
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stream_type, tls_context_type
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>;
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using clisvc_ptr = std::shared_ptr<client_service_type>;
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clisvc_ptr _svc_ptr;
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public:
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/**
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* \brief Constructs a Client with given parameters.
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*
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* \param ex An executor that will be associated with the Client.
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* \param cnf
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* \param tls_context A context object used in TLS/SLL connection.
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*/
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explicit mqtt_client(
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const executor_type& ex,
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const std::string& cnf,
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TlsContext tls_context = {}
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) :
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_svc_ptr(std::make_shared<client_service_type>(
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ex, cnf, std::move(tls_context)
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))
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{}
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/**
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* \brief Constructs a Client with given parameters.
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*
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* \tparam \__ExecutionContext\__ Type of a concrete execution context.
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* \param context Execution context whose executor will be associated with the Client.
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* \param cnf
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* \param tls_context A context object used in TLS/SLL connection.
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*
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* \par Precondition
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* \code
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* std::is_convertible_v<ExecutionContext&, asio::execution_context&>
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* \endcode
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*/
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template <typename ExecutionContext>
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requires (std::is_convertible_v<ExecutionContext&, asio::execution_context&>)
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explicit mqtt_client(
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ExecutionContext& context,
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const std::string& cnf,
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TlsContext tls_context = {}
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) :
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mqtt_client(context.get_executor(), cnf, std::move(tls_context))
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{}
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/// Move-construct an mqtt_client from another.
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/** Moved-from client can only be destructed. */
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mqtt_client(mqtt_client&& other) noexcept = default;
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/// Move-assign an mqtt_client from another.
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/** Cancels this client first.
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* Moved-from client can only be destructed.
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*/
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mqtt_client& operator=(mqtt_client&& other) noexcept {
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cancel();
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_svc_ptr = std::move(other._svc_ptr);
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return *this;
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}
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/**
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* \brief Destructor.
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*
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* \details Automatically calls \ref mqtt_client::cancel.
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*/
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~mqtt_client() {
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if (_svc_ptr) cancel();
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}
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/**
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* \brief Get the executor associated with the object.
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*/
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executor_type get_executor() const noexcept {
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return _svc_ptr->get_executor();
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}
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/**
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* \brief Get the context object used in TLS/SSL connection.
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*
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* \note This function may only be invoked
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* when the template parameter \__TlsContext\__ was configured
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* with non-default type during the creation of a \ref mqtt_client.
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*
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* \par Precondition
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* \code
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* !std::is_same_v<TlsContext, std::monostate>
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* \endcode
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*/
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decltype(auto) tls_context()
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requires (!std::is_same_v<TlsContext, std::monostate>) {
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return _svc_ptr->tls_context();
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}
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/**
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* \brief Start the Client.
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*/
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void run() {
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_svc_ptr->open_stream();
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detail::ping_op { _svc_ptr }
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.perform(read_timeout - std::chrono::seconds(1));
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detail::read_message_op { _svc_ptr }.perform();
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detail::sentry_op { _svc_ptr }.perform();
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}
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/**
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* \brief Cancel all asynchronous operations. This function has terminal effects.
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*
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* \details All outstanding operations will complete
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* with `boost::asio::error::operation_aborted`.
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*
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* \attention This function has terminal effects and will close the Client.
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* The Client cannot be used before calling \ref mqtt_client::run again.
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*/
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void cancel() {
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get_executor().execute([svc_ptr = _svc_ptr]() {
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svc_ptr->cancel();
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});
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}
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/**
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* \brief Assign a \ref will Message.
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*
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* \details The \ref will Message that the Broker should publish
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* after the Network Connection is closed and it is not
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* closed normally.
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*/
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mqtt_client& will(will will) {
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_svc_ptr->will(std::move(will));
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return *this;
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}
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/**
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* \brief Assign credentials that will be used to connect to a Broker.
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*
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* \details Credentials consist of a unique Client Identifier and, optionally,
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* a User Name and Password.
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*/
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mqtt_client& credentials(
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std::string client_id,
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std::string username = "", std::string password = ""
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) {
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_svc_ptr->credentials(
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std::move(client_id),
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std::move(username), std::move(password)
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);
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return *this;
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}
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/**
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* \brief Assign a list of Brokers that the Client will attempt to connect to.
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*
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* \details The Client will cycle through the list of hosts,
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* attempting to establish a connection with each
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* until it successfully establishes a connection.
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*
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* \param hosts List of Broker addresses and ports.
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* Address and ports are separated with a colon `:` while
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* pairs of addresses and ports are separated with a comma `,`.
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* \param default_port The default port to connect to in case the port is not
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* explicitly specified in the `hosts` list.
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*
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*
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* \par Example
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* Some valid `hosts` string:
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*
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* \code
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* std::string valid_hosts_1 = "broker1:1883, broker2, broker3:1883";
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* std::string valid_hosts_2 = "broker1";
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* \endcode
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*
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*/
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mqtt_client& brokers(std::string hosts, uint16_t default_port = 1883) {
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_svc_ptr->brokers(std::move(hosts), default_port);
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return *this;
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}
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/**
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* \brief Assign an authenticator that the Client will use for
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* \__ENHANCED_AUTH\__ on every connect to a Broker.
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* Re-authentication can be initiated by calling \ref async_authenticate.
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*
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* \param authenticator Object that will be stored (move-constructed or by reference)
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* and used for authentication. It needs to satisfy \__is_authenticator\__ concept.
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*
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*/
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template <detail::is_authenticator Authenticator>
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mqtt_client& authenticator(Authenticator&& authenticator) {
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_svc_ptr->authenticator(std::forward<Authenticator>(authenticator));
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return *this;
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}
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/**
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* \brief Initiates re-authentication.
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* TODO
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*/
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template <typename CompletionToken>
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decltype(auto) async_authenticate(CompletionToken&& token) {
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using Signature = void(error_code);
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auto initiate = [] (
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auto handler
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) {
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// TODO re-authentication
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};
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return asio::async_initiate<CompletionToken, Signature>(
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std::move(initiate), token
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);
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}
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/**
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* \brief Send a \__PUBLISH\__ packet to Broker to transport an
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* Application Message.
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*
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* \tparam qos_type The \ref qos_e level of assurance for delivery.
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* \param topic Identification of the information channel to which
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* Payload data is published.
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* \param payload The Application Message that is being published.
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* \param retain The \ref retain_e flag.
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* \param props An instance of \__PUBLISH_PROPS\__.
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* \param token Completion token that will be used to produce a
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* completion handler. The handler will be invoked when the operation completes.
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* On immediate completion, invocation of the handler will be performed in a manner
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* equivalent to using \__POST\__.
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*
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* \par Handler signature
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* The handler signature for this operation depends on the \ref qos_e specified:\n
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*
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* \ref qos_e == `qos_e::at_most_once`:
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* \code
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* void (
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* __ERROR_CODE__ // Result of operation
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* )
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* \endcode
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*
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* \ref qos_e == `qos_e::at_least_once`:
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* \code
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* void (
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* __ERROR_CODE__, // Result of operation.
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* __REASON_CODE__, // Reason Code received from Broker.
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* __PUBACK_PROPS__ // Properties received in the PUBACK packet.
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* )
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* \endcode
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*
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* \ref qos_e == `qos_e::exactly_once`:
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* \code
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* void (
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* __ERROR_CODE__, // Result of operation.
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* __REASON_CODE__, // Reason Code received from Broker.
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* __PUBCOMP_PROPS__ // Properties received in the PUBCOMP packet.
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* )
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* \endcode
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*
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* \par Error codes
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* The list of all possible error codes that this operation can finish with:\n
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* - `boost::system::errc::errc_t::success` \n
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* - `boost::asio::error::operation_aborted` \n
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* - `boost::asio::error::no_recovery` \n
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* - \link async_mqtt5::client::error::pid_overrun \endlink
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* - \link async_mqtt5::client::error::qos_not_supported \endlink
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* - \link async_mqtt5::client::error::retain_not_available \endlink
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* - \link async_mqtt5::client::error::topic_alias_maximum_reached \endlink
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*
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* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
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*/
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template <qos_e qos_type, typename CompletionToken>
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decltype(auto) async_publish(
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std::string topic, std::string payload,
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retain_e retain, const publish_props& props,
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CompletionToken&& token
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) {
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using Signature = detail::on_publish_signature<qos_type>;
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auto initiate = [] (
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auto handler, std::string topic, std::string payload,
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retain_e retain, const publish_props& props,
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const clisvc_ptr& svc_ptr
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) {
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detail::publish_send_op<
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client_service_type, decltype(handler), qos_type
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> { svc_ptr, std::move(handler) }
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.perform(
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std::move(topic), std::move(payload),
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retain, props
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);
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};
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return asio::async_initiate<CompletionToken, Signature>(
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std::move(initiate), token,
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std::move(topic), std::move(payload), retain, props, _svc_ptr
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);
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}
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// TODO: perhaps there is a way to not copy documentation (\copybrief, \copydetails)
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/**
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* \brief Send a \__SUBSCRIBE\__ packet to Broker to create a subscription
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* to one or more Topics of interest.
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*
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* \details After the subscription has been established, the Broker will send
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* PUBLISH packets to the Client to forward Application Messages that were published
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* to Topics that the Client subscribed to. The Application Messages can be received
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* with \ref mqtt_client::async_receive function.
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*
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* \param topics A list of \ref subscribe_topic of interest.
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* \param props An instance of \__SUBSCRIBE_PROPS\__.
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* \param token Completion token that will be used to produce a
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* completion handler. The handler will be invoked when the operation completes.
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* On immediate completion, invocation of the handler will be performed in a manner
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* equivalent to using \__POST\__.
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*
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* \par Handler signature
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* The handler signature for this operation:
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* \code
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* void (
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* __ERROR_CODE__, // Result of operation.
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* std::vector<__REASON_CODE__>, // Vector of Reason Codes indicating
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* // the subscription result for each Topic
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* // in the SUBSCRIBE packet.
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* __SUBACK_PROPS__, // Properties received in the SUBACK packet.
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* )
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* \endcode
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*
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* \par Error codes
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* The list of all possible error codes that this operation can finish with:\n
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* - `boost::system::errc::errc_t::success` \n
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* - `boost::asio::error::no_recovery` \n
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* - `boost::asio::error::operation_aborted` \n
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* - \link async_mqtt5::client::error::pid_overrun \endlink
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*
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* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
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*/
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template <typename CompletionToken>
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decltype(auto) async_subscribe(
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const std::vector<subscribe_topic>& topics,
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const subscribe_props& props,
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CompletionToken&& token
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) {
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using Signature = void (
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error_code, std::vector<reason_code>, suback_props
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);
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auto initiate = [] (
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auto handler, const std::vector<subscribe_topic>& topics,
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const subscribe_props& props, const clisvc_ptr& impl
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) {
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detail::subscribe_op { impl, std::move(handler) }
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.perform(topics, props);
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};
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return asio::async_initiate<CompletionToken, Signature>(
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std::move(initiate), token, topics, props, _svc_ptr
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);
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}
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/**
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* \brief Send a \__SUBSCRIBE\__ packet to Broker to create a subscription
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* to one Topics of interest.
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*
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* \details After the subscription has been established, the Broker will send
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* \__PUBLISH\__ packets to the Client to forward Application Messages that were published
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* to Topics that the Client subscribed to. The Application Messages can be received
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* with \ref mqtt_client::async_receive function.
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*
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* \param topic A \ref subscribe_topic of interest.
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* \param props An instance of \__SUBSCRIBE_PROPS\__.
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* \param token Completion token that will be used to produce a
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* completion handler. The handler will be invoked when the operation completes.
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* On immediate completion, invocation of the handler will be performed in a manner
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* equivalent to using \__POST\__.
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*
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* \par Handler signature
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* The handler signature for this operation:
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* \code
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* void (
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* __ERROR_CODE__, // Result of operation.
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* std::vector<__REASON_CODE__>, // Vector of Reason Codes containing the
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* // single subscription result for the Topic
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* // in the SUBSCRIBE packet.
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* __SUBACK_PROPS__, // Properties received in the SUBACK packet.
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* )
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* \endcode
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*
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* \par Error codes
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* The list of all possible error codes that this operation can finish with:\n
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* - `boost::system::errc::errc_t::success` \n
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* - `boost::asio::error::no_recovery` \n
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* - `boost::asio::error::operation_aborted` \n
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* - \link async_mqtt5::client::error::pid_overrun \endlink
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*
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* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
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*/
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template <typename CompletionToken>
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decltype(auto) async_subscribe(
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const subscribe_topic& topic, const subscribe_props& props,
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CompletionToken&& token
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) {
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return async_subscribe(
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std::vector<subscribe_topic> { topic }, props,
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std::forward<CompletionToken>(token)
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);
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}
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/**
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* \brief Send an \__UNSUBSCRIBE\__ packet to Broker to unsubscribe from one
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* or more Topics.
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*
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* \note The Client may still receive residual Application Messages
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* through the \ref mqtt_client::async_receive function
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* from Topics the Client just unsubscribed to.
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*
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* \param topics List of Topics to unsubscribe from.
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* \param props An instance of \__UNSUBSCRIBE_PROPS\__.
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* \param token Completion token that will be used to produce a
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* completion handler. The handler will be invoked when the operation completes.
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* On immediate completion, invocation of the handler will be performed in a manner
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* equivalent to using \__POST\__.
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*
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* \par Handler signature
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* The handler signature for this operation:
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* \code
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* void (
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* __ERROR_CODE__, // Result of operation.
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* std::vector<__REASON_CODE__>, // Vector of Reason Codes indicating
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* // the result of unsubscribe operation
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* // for each Topic in the UNSUBSCRIBE packet.
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* __UNSUBACK_PROPS__, // Properties received in the UNSUBACK packet.
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* )
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* \endcode
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*
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* \par Error codes
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* The list of all possible error codes that this operation can finish with:\n
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* - `boost::system::errc::errc_t::success` \n
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* - `boost::asio::error::no_recovery` \n
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* - `boost::asio::error::operation_aborted` \n
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* - \link async_mqtt5::client::error::pid_overrun \endlink
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*
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* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
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*/
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template <typename CompletionToken>
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decltype(auto) async_unsubscribe(
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const std::vector<std::string>& topics, const unsubscribe_props& props,
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CompletionToken&& token
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) {
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using Signature = void (
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error_code, std::vector<reason_code>, unsuback_props
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);
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auto initiate = [](
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auto handler,
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const std::vector<std::string>& topics,
|
|
const unsubscribe_props& props, const clisvc_ptr& impl
|
|
) {
|
|
detail::unsubscribe_op { impl, std::move(handler) }
|
|
.perform(topics, props);
|
|
};
|
|
|
|
return asio::async_initiate<CompletionToken, Signature>(
|
|
std::move(initiate), token, topics, props, _svc_ptr
|
|
);
|
|
}
|
|
|
|
/**
|
|
* \brief Send an \__UNSUBSCRIBE\__ packet to Broker to unsubscribe
|
|
* from one Topic.
|
|
*
|
|
* \note The Client may still receive residual Application Messages
|
|
* through the \ref mqtt_client::async_receive function
|
|
* from Topics the Client just unsubscribed to.
|
|
*
|
|
* \param topic Topic to unsubscribe from.
|
|
* \param props An instance of \__UNSUBSCRIBE_PROPS\__.
|
|
* \param token Completion token that will be used to produce a
|
|
* completion handler. The handler will be invoked when the operation completes.
|
|
* On immediate completion, invocation of the handler will be performed in a manner
|
|
* equivalent to using \__POST\__.
|
|
*
|
|
* \par Handler signature
|
|
* The handler signature for this operation:
|
|
* \code
|
|
* void (
|
|
* __ERROR_CODE__, // Result of operation.
|
|
* std::vector<__REASON_CODE__>, // Vector of Reason Codes containing
|
|
* // the result of unsubscribe operation
|
|
* // for the Topic in the UNSUBSCRIBE packet.
|
|
* __UNSUBACK_PROPS__, // Properties received in the UNSUBACK packet.
|
|
* )
|
|
* \endcode
|
|
*
|
|
* \par Error codes
|
|
* The list of all possible error codes that this operation can finish with:\n
|
|
* - `boost::system::errc::errc_t::success` \n
|
|
* - `boost::asio::error::no_recovery` \n
|
|
* - `boost::asio::error::operation_aborted` \n
|
|
* - \link async_mqtt5::client::error::pid_overrun \endlink
|
|
*
|
|
* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
|
|
*/
|
|
template <typename CompletionToken>
|
|
decltype(auto) async_unsubscribe(
|
|
const std::string& topic, const unsubscribe_props& props,
|
|
CompletionToken&& token
|
|
) {
|
|
return async_unsubscribe(
|
|
std::vector<std::string> { topic }, props,
|
|
std::forward<CompletionToken>(token)
|
|
);
|
|
}
|
|
|
|
|
|
// TODO: cancel the channel!
|
|
/**
|
|
* \brief Asynchronously receive an Application Message.
|
|
*
|
|
* \details The Client will receive and complete deliveries for all the
|
|
* \__PUBLISH\__ packets received from the Broker throughout its lifetime.
|
|
* The Client will store them internally in order they were delivered.
|
|
* Calling this function will attempt to receive an Application Message
|
|
* from internal storage.
|
|
*
|
|
* \note The completion handler will be only invoked if an error occurred
|
|
* or there is a pending Application Message.
|
|
*
|
|
* \param token Completion token that will be used to produce a
|
|
* completion handler. The handler will be invoked when the operation completes.
|
|
* On immediate completion, invocation of the handler will be performed in a manner
|
|
* equivalent to using \__POST\__.
|
|
*
|
|
* \par Handler signature
|
|
* The handler signature for this operation:
|
|
* \code
|
|
* void (
|
|
* __ERROR_CODE__, // Result of operation.
|
|
* std::string, // Topic, the origin of the Application Message.
|
|
* std::string, // Payload, the content of the Application Message.
|
|
* __PUBLISH_PROPS__, // Properties received in the PUBLISH packet.
|
|
* )
|
|
* \endcode
|
|
*
|
|
* \par Error codes
|
|
* The list of all possible error codes that this operation can finish with:\n
|
|
* - `boost::system::errc::errc_t::success`\n
|
|
* - `boost::asio::experimental::error::channel_cancelled`
|
|
*
|
|
* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
|
|
*/
|
|
template <typename CompletionToken>
|
|
decltype(auto) async_receive(CompletionToken&& token) {
|
|
// Sig = void (error_code, std::string, std::string, publish_props)
|
|
return _svc_ptr->async_channel_receive(
|
|
std::forward<CompletionToken>(token)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* \brief Disconnect the Client. This function has terminal effects.
|
|
*
|
|
* \details Send a \__DISCONNECT\__ packet to the Broker with a Reason Code
|
|
* describing the reason for disconnection.
|
|
*
|
|
* \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.
|
|
* \param props An instance of \__DISCONNECT_PROPS\__.
|
|
* \param token Completion token that will be used to produce a
|
|
* completion handler. The handler will be invoked when the operation completes.
|
|
* On immediate completion, invocation of the handler will be performed in a manner
|
|
* equivalent to using \__POST\__.
|
|
*
|
|
* \par Handler signature
|
|
* The handler signature for this operation:
|
|
* \code
|
|
* void (
|
|
* __ERROR_CODE__ // Result of operation.
|
|
* )
|
|
* \endcode
|
|
*
|
|
* \par Error codes
|
|
* 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
|
|
*
|
|
* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
|
|
*/
|
|
template <typename CompletionToken>
|
|
decltype(auto) async_disconnect(
|
|
disconnect_rc_e reason_code, const disconnect_props& props,
|
|
CompletionToken&& token
|
|
) {
|
|
return detail::async_disconnect(
|
|
detail::disconnect_rc_e(static_cast<uint8_t>(reason_code)),
|
|
props, true, _svc_ptr,
|
|
std::forward<CompletionToken>(token)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* \brief Disconnect the Client. This function has terminal effects.
|
|
*
|
|
* \details Send a \__DISCONNECT\__ packet to the Broker with a Reason Code
|
|
* \ref reason_codes::normal_disconnection describing
|
|
* the reason for disconnection.
|
|
*
|
|
* \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. The handler will be invoked when the operation completes.
|
|
* On immediate completion, invocation of the handler will be performed in a manner
|
|
* equivalent to using \__POST\__.
|
|
*
|
|
* \par Handler signature
|
|
* The handler signature for this operation:
|
|
* \code
|
|
* void (
|
|
* __ERROR_CODE__ // Result of operation.
|
|
* )
|
|
* \endcode
|
|
*
|
|
* \par Error codes
|
|
* 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
|
|
*
|
|
* Refer to the section on \__ERROR_HANDLING\__ to find the underlying causes for each error code.
|
|
*/
|
|
template <typename CompletionToken>
|
|
decltype(auto) async_disconnect(CompletionToken&& token) {
|
|
return async_disconnect(
|
|
disconnect_rc_e::normal_disconnection,
|
|
disconnect_props {}, std::forward<CompletionToken>(token)
|
|
);
|
|
}
|
|
};
|
|
|
|
|
|
} // end namespace async_mqtt5
|
|
|
|
#endif // !ASYNC_MQTT5_MQTT_CLIENT_HPP
|