MqttDispatcher/dist/mqttdispatcher.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const Mqtt = require("mqtt");
const log = require("./log");
const callchain = require("./callchain");
const fs = require("fs");
const MQTT_BROKER_DEFAULT_URL = "mqtt://localhost";
function passThrough(message) {
    return message;
}
exports.passThrough = passThrough;
class MqttDispatcher {
    constructor(mqttBrokerUrl, mqttUser, mqttPass, mqttCAFile) {
        this._mqttOptions = {};
        this._mqttBrokerUrl = (mqttBrokerUrl) ? mqttBrokerUrl : MQTT_BROKER_DEFAULT_URL;
        if (mqttUser && mqttPass) {
            this._mqttOptions.username = mqttUser;
            this._mqttOptions.password = mqttPass;
        }
        if (mqttCAFile) {
            this._mqttOptions.ca = fs.readFileSync(mqttCAFile, 'ascii');
            this._mqttOptions.rejectUnauthorized = true;
        }
        this._topicHandlers = [];
    }
    register(topic, label, newChainItemOrCallbackFunc) {
        let newChainItem;
        if (newChainItemOrCallbackFunc instanceof callchain.AChainItem) {
            newChainItem = newChainItemOrCallbackFunc;
        }
        else {
            let myNewChainItem = new callchain.ChainItem(label);
            myNewChainItem.registerFunc(newChainItemOrCallbackFunc);
            newChainItem = myNewChainItem;
        }
        let done = false;
        for (let topicHandler of this._topicHandlers) {
            if (topicHandler.topic === topic) {
                topicHandler.last.registerNext(newChainItem);
                topicHandler.last = newChainItem;
                done = true;
                log.info(`additional callback ${newChainItem.toString()} added for topic ${topic}`);
            }
        }
        if (!done) {
            this._topicHandlers.push({ topic: topic, root: newChainItem, last: newChainItem });
            log.info(`first callback ${newChainItem.toString()} added for topic ${topic}`);
        }
    }
    exec() {
        for (let topicHandler of this._topicHandlers) {
            topicHandler.root.begin();
        }
        log.info(`connecting to ${this._mqttBrokerUrl}`);
        this._mqttClient = Mqtt.connect(this._mqttBrokerUrl, this._mqttOptions);
        this._mqttClient.on('error', log.error);
        this._mqttClient.on('connect', () => {
            log.info("connected to mqtt broker");
            for (let topicHandler of this._topicHandlers) {
                this._mqttClient.subscribe(topicHandler.topic);
            }
        });
        this._mqttClient.on('message', (topic, payload) => {
            log.info(`message received, topic ${topic}, payload ${payload}`);
            for (let topicHandler of this._topicHandlers) {
                if (this.topicMatch(topicHandler.topic, topic)) {
                    log.info(`received topic ${topic} matches registered topic ${topicHandler.topic}`);
                    topicHandler.root.send(payload);
                }
            }
        });
    }
    topicMatch(registeredTopic, receivedTopic) {
        let registeredTopicFields = registeredTopic.split('/');
        let receivedTopicFields = receivedTopic.split('/');
        for (let field in registeredTopicFields) {
            let regField = registeredTopicFields[field];
            let recvField = receivedTopicFields[field];
            log.info(`recv: ${recvField}, reg: ${regField}`);
            if (regField === "#") {
                log.info('true');
                return true;
            }
            if (regField != recvField && regField != "+") {
                log.info('false');
                return false;
            }
        }
        if (registeredTopicFields.length == receivedTopicFields.length) {
            log.info('true');
            return true;
        }
        else {
            log.info('false');
            return false;
        }
    }
}
exports.MqttDispatcher = MqttDispatcher;
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