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https://github.com/node-red/node-red.git
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Merge pull request #4190 from Steve-Mcl/fix-mqtt-keep-subscription-4132
Fix new feature "mqtt keep subscription"
This commit is contained in:
Nick O'Leary
GitHub
commit
dfe145a0ed
@ -219,8 +219,10 @@ module.exports = function(RED) {
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* Handle the payload / packet recieved in MQTT In and MQTT Sub nodes
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*/
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function subscriptionHandler(node, datatype ,topic, payload, packet) {
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const v5 = node.brokerConn.options && node.brokerConn.options.protocolVersion == 5;
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var msg = {topic:topic, payload:null, qos:packet.qos, retain:packet.retain};
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const msg = {topic:topic, payload:null, qos:packet.qos, retain:packet.retain};
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const v5 = (node && node.brokerConn)
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? node.brokerConn.v5()
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: Object.prototype.hasOwnProperty.call(packet, "properties");
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if(v5 && packet.properties) {
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setStrProp(packet.properties, msg, "responseTopic");
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setBufferProp(packet.properties, msg, "correlationData");
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@ -300,7 +302,7 @@ module.exports = function(RED) {
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//}
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}
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msg.payload = payload;
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if ((node.brokerConn.broker === "localhost")||(node.brokerConn.broker === "127.0.0.1")) {
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if (node.brokerConn && (node.brokerConn.broker === "localhost" || node.brokerConn.broker === "127.0.0.1")) {
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msg._topic = topic;
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}
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node.send(msg);
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@ -412,6 +414,12 @@ module.exports = function(RED) {
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}
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}
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/**
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* Perform the connect action
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* @param {MQTTInNode|MQTTOutNode} node
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* @param {Object} msg
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* @param {Function} done
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*/
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function handleConnectAction(node, msg, done) {
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let actionData = typeof msg.broker === 'object' ? msg.broker : null;
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if (node.brokerConn.canConnect()) {
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@ -442,12 +450,17 @@ module.exports = function(RED) {
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}
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}
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/**
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* Perform the disconnect action
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* @param {MQTTInNode|MQTTOutNode} node
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* @param {Function} done
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*/
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function handleDisconnectAction(node, done) {
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node.brokerConn.disconnect(function () {
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done();
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});
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}
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const unsubscribeCandidates = {}
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//#endregion "Supporting functions"
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//#region "Broker node"
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@ -591,10 +604,9 @@ module.exports = function(RED) {
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if (typeof node.cleansession === 'undefined') {
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node.cleansession = true;
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}
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if (typeof node.autoUnsubscribe === 'undefined') {
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if (typeof node.autoUnsubscribe !== 'boolean') {
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node.autoUnsubscribe = true;
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}
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//use url or build a url from usetls://broker:port
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if (node.url && node.brokerurl !== node.url) {
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node.brokerurl = node.url;
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@ -664,7 +676,6 @@ module.exports = function(RED) {
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node.options.password = node.password;
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node.options.keepalive = node.keepalive;
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node.options.clean = node.cleansession;
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node.options.autoUnsubscribe = node.autoUnsubscribe;
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node.options.clientId = node.clientid || 'nodered_' + RED.util.generateId();
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node.options.reconnectPeriod = RED.settings.mqttReconnectTime||5000;
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delete node.options.protocolId; //V4+ default
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@ -785,18 +796,11 @@ module.exports = function(RED) {
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// Re-subscribe to stored topics
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for (var s in node.subscriptions) {
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if (node.subscriptions.hasOwnProperty(s)) {
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let topic = s;
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let qos = 0;
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let _options = {};
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for (var r in node.subscriptions[s]) {
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if (node.subscriptions[s].hasOwnProperty(r)) {
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qos = Math.max(qos,node.subscriptions[s][r].qos);
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_options = node.subscriptions[s][r].options;
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node._clientOn('message',node.subscriptions[s][r].handler);
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node.subscribe(node.subscriptions[s][r])
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}
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}
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_options.qos = _options.qos || qos;
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node.client.subscribe(topic, _options);
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}
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}
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@ -858,6 +862,12 @@ module.exports = function(RED) {
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if(!node.client) { return _callback(); }
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if(node.closing) { return _callback(); }
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/**
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* Call end and wait for the client to end (or timeout)
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* @param {mqtt.MqttClient} client The broker client
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* @param {number} ms The time to wait for the client to end
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* @returns
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*/
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let waitEnd = (client, ms) => {
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return new Promise( (resolve, reject) => {
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node.closing = true;
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@ -867,7 +877,7 @@ module.exports = function(RED) {
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const t = setTimeout(() => {
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//clean end() has exceeded WAIT_END, lets force end!
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client && client.end(true);
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reject();
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resolve();
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}, ms);
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client.end(() => {
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clearTimeout(t);
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@ -894,69 +904,222 @@ module.exports = function(RED) {
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}
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node.subscriptionIds = {};
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node.subid = 1;
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node.subscribe = function (topic,options,callback,ref) {
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ref = ref||0;
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var qos;
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if(typeof options == "object") {
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qos = options.qos;
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} else {
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qos = options;
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options = {};
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//typedef for subscription object:
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/**
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* @typedef {Object} Subscription
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* @property {String} topic - topic to subscribe to
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* @property {Object} [options] - options object
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* @property {Number} [options.qos] - quality of service
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* @property {Number} [options.nl] - no local
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* @property {Number} [options.rap] - retain as published
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* @property {Number} [options.rh] - retain handling
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* @property {Number} [options.properties] - MQTT 5.0 properties
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* @property {Number} [options.properties.subscriptionIdentifier] - MQTT 5.0 subscription identifier
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* @property {Number} [options.properties.userProperties] - MQTT 5.0 user properties
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* @property {Function} callback
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* @property {String} ref - reference to the node that created the subscription
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*/
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/**
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* Create a subscription object
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* @param {String} _topic - topic to subscribe to
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* @param {Object} _options - options object
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* @param {String} _ref - reference to the node that created the subscription
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* @returns {Subscription}
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*/
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function createSubscriptionObject(_topic, _options, _ref, _brokerId) {
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/** @type {Subscription} */
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const subscription = {};
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const ref = _ref || 0;
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let options
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let qos = 1 // default to QoS 1 (AWS and several other brokers don't support QoS 2)
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// if options is an object, then clone it
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if (typeof _options == "object") {
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options = RED.util.cloneMessage(_options || {})
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qos = _options.qos;
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} else if (typeof _options == "number") {
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qos = _options;
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}
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options = options || {};
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// sanitise qos
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if (typeof qos === "number" && qos >= 0 && qos <= 2) {
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options.qos = qos;
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}
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subscription.topic = _topic;
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subscription.qos = qos;
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subscription.options = RED.util.cloneMessage(options);
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subscription.ref = ref;
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subscription.brokerId = _brokerId;
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return subscription;
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}
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/**
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* If topic is a subscription object, then use that, otherwise look up the topic in
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* the subscriptions object. If the topic is not found, then create a new subscription
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* object and add it to the subscriptions object.
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* @param {Subscription|String} topic
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* @param {*} options
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* @param {*} callback
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* @param {*} ref
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*/
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node.subscribe = function (topic, options, callback, ref) {
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/** @type {Subscription} */
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let subscription
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let doCompare = false
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let changesFound = false
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// function signature 1: subscribe(subscription: Subscription)
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if (typeof topic === "object" && topic !== null) {
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subscription = topic
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topic = subscription.topic
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options = subscription.options
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ref = subscription.ref
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callback = subscription.callback
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}
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// function signature 2: subscribe(topic: String, options: Object, callback: Function, ref: String)
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else if (typeof topic === "string") {
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// since this is a call where all params are provided, it might be
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// a node change (modification) so we need to check for changes
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doCompare = true
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subscription = node.subscriptions[topic] && node.subscriptions[topic][ref]
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}
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// bad function call
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else {
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console.warn('Invalid call to node.subscribe')
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return
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}
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const thisBrokerId = node.type === 'mqtt-broker' ? node.id : node.broker
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// unsubscribe topics where the broker has changed
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const oldBrokerSubs = (unsubscribeCandidates[ref] || []).filter(sub => sub.brokerId !== thisBrokerId)
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oldBrokerSubs.forEach(sub => {
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/** @type {MQTTBrokerNode} */
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const _brokerConn = RED.nodes.getNode(sub.brokerId)
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if (_brokerConn) {
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_brokerConn.unsubscribe(sub.topic, sub.ref, true)
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}
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})
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// if subscription is found (or sent in as a parameter), then check for changes.
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// if there are any changes requested, tidy up the old subscription
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if (subscription) {
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if (doCompare) {
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// compare the current sub to the passed in parameters. Use RED.util.compareObjects against
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// only the minimal set of properties to identify if the subscription has changed
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const currentSubscription = createSubscriptionObject(subscription.topic, subscription.options, subscription.ref)
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const newSubscription = createSubscriptionObject(topic, options, ref)
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changesFound = RED.util.compareObjects(currentSubscription, newSubscription) === false
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}
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}
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if (changesFound) {
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if (subscription.handler) {
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node._clientRemoveListeners('message', subscription.handler)
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subscription.handler = null
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}
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const _brokerConn = RED.nodes.getNode(subscription.brokerId)
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if (_brokerConn) {
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_brokerConn.unsubscribe(subscription.topic, subscription.ref, true)
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}
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}
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// clean up the unsubscribe candidate list
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delete unsubscribeCandidates[ref]
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// determine if this is an existing subscription
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const existingSubscription = typeof subscription === "object" && subscription !== null
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// if existing subscription is not found or has changed, create a new subscription object
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if (existingSubscription === false || changesFound) {
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subscription = createSubscriptionObject(topic, options, ref, node.id)
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}
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// setup remainder of subscription properties and event handling
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node.subscriptions[topic] = node.subscriptions[topic] || {};
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node.subscriptions[topic][ref] = subscription
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if (!node.subscriptionIds[topic]) {
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node.subscriptionIds[topic] = node.subid++;
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}
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options.properties = options.properties || {};
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options.properties.subscriptionIdentifier = node.subscriptionIds[topic];
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subscription.options = subscription.options || {};
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subscription.options.properties = options.properties || {};
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subscription.options.properties.subscriptionIdentifier = node.subscriptionIds[topic];
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subscription.callback = callback;
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node.subscriptions[topic] = node.subscriptions[topic]||{};
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var sub = {
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topic:topic,
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qos:qos,
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options:options,
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handler:function(mtopic,mpayload, mpacket) {
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if(mpacket.properties && options.properties && mpacket.properties.subscriptionIdentifier && options.properties.subscriptionIdentifier && (mpacket.properties.subscriptionIdentifier !== options.properties.subscriptionIdentifier) ) {
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//do nothing as subscriptionIdentifier does not match
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} else if (matchTopic(topic,mtopic)) {
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callback(mtopic,mpayload, mpacket);
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}
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},
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ref: ref
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};
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node.subscriptions[topic][ref] = sub;
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// if the client is connected, then setup the handler and subscribe
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if (node.connected) {
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const subIdsAvailable = node.subscriptionIdentifiersAvailable()
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node._clientOn('message',sub.handler);
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// if the broker doesn't support subscription identifiers (e.g. AWS core), then don't send them
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if (options.properties && options.properties.subscriptionIdentifier && subIdsAvailable !== true) {
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delete options.properties.subscriptionIdentifier
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}
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node.client.subscribe(topic, options);
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}
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};
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node.unsubscribe = function (topic, ref, removed) {
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if (!subscription.handler) {
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subscription.handler = function (mtopic, mpayload, mpacket) {
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const sops = subscription.options ? subscription.options.properties : {}
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const pops = mpacket.properties || {}
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if (subIdsAvailable && pops.subscriptionIdentifier && sops.subscriptionIdentifier && (pops.subscriptionIdentifier !== sops.subscriptionIdentifier)) {
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//do nothing as subscriptionIdentifier does not match
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} else if (matchTopic(topic, mtopic)) {
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subscription.callback && subscription.callback(mtopic, mpayload, mpacket)
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}
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}
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}
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node._clientOn('message', subscription.handler)
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// if the broker doesn't support subscription identifiers, then don't send them (AWS support)
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if (subscription.options.properties && subscription.options.properties.subscriptionIdentifier && subIdsAvailable !== true) {
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delete subscription.options.properties.subscriptionIdentifier
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}
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node.client.subscribe(topic, subscription.options)
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}
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}
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node.unsubscribe = function (topic, ref, removeClientSubscription) {
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ref = ref||0;
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var sub = node.subscriptions[topic];
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const unsub = removeClientSubscription || node.autoUnsubscribe !== false
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const sub = node.subscriptions[topic];
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let brokerId = node.id
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if (sub) {
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if (sub[ref]) {
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if(node.client) {
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brokerId = sub[ref].brokerId || brokerId
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if(node.client && sub[ref].handler) {
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node._clientRemoveListeners('message', sub[ref].handler);
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sub[ref].handler = null
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}
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delete sub[ref];
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if (unsub) {
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delete sub[ref]
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}
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//TODO: Review. The `if(removed)` was commented out to always delete and remove subscriptions.
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// if we dont then property changes dont get applied and old subs still trigger
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//if (removed) {
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}
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// if instructed to remove the actual MQTT client subscription
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if (unsub) {
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// if there are no more subscriptions for the topic, then remove the topic
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if (Object.keys(sub).length === 0) {
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try {
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node.client.unsubscribe(topic)
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} catch (_err) {
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// do nothing
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} finally {
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// remove unsubscribe candidate as it is now REALLY unsubscribed
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delete node.subscriptions[topic];
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delete node.subscriptionIds[topic];
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if (node.connected) {
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node.client.unsubscribe(topic);
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if (unsubscribeCandidates[ref]) {
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unsubscribeCandidates[ref] = unsubscribeCandidates[ref].filter(sub => sub.topic !== topic)
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}
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}
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//}
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}
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} else {
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// if instructed to not remove the client subscription, then add it to the candidate list
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// of subscriptions to be removed when the the same ref is used in a subsequent subscribe
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// and the topic has changed
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unsubscribeCandidates[ref] = unsubscribeCandidates[ref] || [];
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unsubscribeCandidates[ref].push({
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topic: topic,
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ref: ref,
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brokerId: brokerId
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})
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}
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}
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};
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node.topicAliases = {};
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@ -994,7 +1157,7 @@ module.exports = function(RED) {
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setStrProp(msg, options.properties, "contentType");
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setIntProp(msg, options.properties, "messageExpiryInterval", 0);
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setUserProperties(msg.userProperties, options.properties);
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setIntProp(msg, options.properties, "topicAlias", 1, node.serverProperties.topicAliasMaximum || 0);
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setIntProp(msg, options.properties, "topicAlias", 1, bsp.topicAliasMaximum || 0);
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setBoolProp(msg, options.properties, "payloadFormatIndicator");
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//FUTURE setIntProp(msg, options.properties, "subscriptionIdentifier", 1, 268435455);
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@ -1130,7 +1293,7 @@ module.exports = function(RED) {
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if(node.rap === "true" || node.rap === true) options.rap = true;
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else if(node.rap === "false" || node.rap === false) options.rap = false;
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}
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node._topic = node.topic; // store the original topic incase node is later changed
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node.brokerConn.subscribe(node.topic,options,function(topic, payload, packet) {
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subscriptionHandler(node, node.datatype, topic, payload, packet);
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},node.id);
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@ -1183,7 +1346,7 @@ module.exports = function(RED) {
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}
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if (action === Actions.UNSUBSCRIBE) {
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subscriptions.forEach(function (sub) {
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node.brokerConn.unsubscribe(sub.topic, node.id);
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node.brokerConn.unsubscribe(sub.topic, node.id, true);
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delete node.dynamicSubs[sub.topic];
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})
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//user can access current subscriptions through the complete node is so desired
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@ -1193,7 +1356,7 @@ module.exports = function(RED) {
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subscriptions.forEach(function (sub) {
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//always unsubscribe before subscribe to prevent multiple subs to same topic
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if (node.dynamicSubs[sub.topic]) {
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node.brokerConn.unsubscribe(sub.topic, node.id);
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node.brokerConn.unsubscribe(sub.topic, node.id, true);
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delete node.dynamicSubs[sub.topic];
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}
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@ -1239,17 +1402,13 @@ module.exports = function(RED) {
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node.on('close', function(removed, done) {
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if (node.brokerConn) {
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if(node.isDynamic) {
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if (node.brokerConn.options.autoUnsubscribe) {
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Object.keys(node.dynamicSubs).forEach(function (topic) {
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node.brokerConn.unsubscribe(topic, node.id, removed);
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});
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node.dynamicSubs = {};
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}
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} else {
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if (node.brokerConn.options.autoUnsubscribe) {
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node.brokerConn.unsubscribe(node.topic, node.id, removed);
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}
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}
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node.brokerConn.deregister(node, done, removed);
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node.brokerConn = null;
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} else {
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