95 lines
3.5 KiB
JavaScript
95 lines
3.5 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const Mqtt = require("mqtt");
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const log = require("./log");
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const MQTT_BROKER_DEFAULT_URL = "mqtt://localhost";
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class TopicHandlerCallback {
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constructor(label, func) {
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this._label = label;
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this._func = func;
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}
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get func() {
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return this._func;
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}
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toString() {
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let funcName = (this._func.name === "") ? "lambda" : this._func.name;
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return `<${funcName}, ${this._label}>`;
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}
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}
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function passThrough(message) {
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return message;
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}
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exports.passThrough = passThrough;
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class MqttClient {
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constructor(mqttBrokerUrl) {
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this._mqttBrokerUrl = (mqttBrokerUrl) ? mqttBrokerUrl : MQTT_BROKER_DEFAULT_URL;
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this._topicHandlers = [];
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}
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register(topic, label, callbackFunc) {
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let done = false;
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let callback = new TopicHandlerCallback(label, callbackFunc);
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for (let topicHandler of this._topicHandlers) {
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if (topicHandler.topic === topic) {
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topicHandler.callbacks.push(callback);
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done = true;
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log.info(`additional callback ${callback.toString()} added for topic ${topic}`);
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}
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}
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if (!done) {
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this._topicHandlers.push({ topic: topic, callbacks: [callback] });
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log.info(`first callback ${callback.toString()} added for topic ${topic}`);
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}
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}
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exec() {
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this._mqttClient = Mqtt.connect(this._mqttBrokerUrl);
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this._mqttClient.on('error', log.error);
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this._mqttClient.on('connect', () => {
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log.info("connected to mqtt broker");
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for (let topicHandler of this._topicHandlers) {
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this._mqttClient.subscribe(topicHandler.topic);
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}
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});
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this._mqttClient.on('message', (topic, payload) => {
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log.info(`message received, topic ${topic}, payload ${payload}`);
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for (let topicHandler of this._topicHandlers) {
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if (this.topicMatch(topicHandler.topic, topic)) {
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log.info(`received topic ${topic} matches registered topic ${topicHandler.topic}`);
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// topicHandler.callback(payload)
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let returnValue = payload;
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for (let topicHandlerCallback of topicHandler.callbacks) {
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log.info(`Calling ${topicHandlerCallback}`);
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returnValue = topicHandlerCallback.func(returnValue);
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}
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log.info(`Final return value is ${returnValue}`);
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}
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}
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});
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}
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topicMatch(registeredTopic, receivedTopic) {
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let registeredTopicFields = registeredTopic.split('/');
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let receivedTopicFields = receivedTopic.split('/');
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for (let field in registeredTopicFields) {
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let regField = registeredTopicFields[field];
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let recvField = receivedTopicFields[field];
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log.info(`recv: ${recvField}, reg: ${regField}`);
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if (regField === "#") {
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log.info('true');
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return true;
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}
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if (regField != recvField && regField != "+") {
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log.info('false');
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return false;
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}
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}
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if (registeredTopicFields.length == receivedTopicFields.length) {
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log.info('true');
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return true;
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}
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else {
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log.info('false');
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return false;
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}
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}
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}
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exports.MqttClient = MqttClient;
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//# sourceMappingURL=mqttclient.js.map
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