node-red-contrib-lorawan/lib/lorawanpool.js

Node-RED module for the LoRaWAN RN2483 and RN2903 radio modules

var util = require('util');
var EventEmitter = require('events');
var LoRaWAN = require('./lorawan.js');

function LoRaWANPoolManager(poolRefreshTime) {
	EventEmitter.call(this);
	var me = this;
	this.openConnections = {};
	this.disconnected = {};
	this.poolRefreshTime = poolRefreshTime || 10000;
}

util.inherits(LoRaWANPoolManager, EventEmitter);

LoRaWANPoolManager.prototype.start = function () {
	var me = this;
	if (!this.reconnectionsHandler) {
		this.reconnectionsHandler = setInterval(function () {
				var keys = Object.keys(me.disconnected);
				keys.forEach(function (id) {
					me.openConnections[id].init();
				});
			}, me.poolRefreshTime);
	}
};

LoRaWANPoolManager.prototype.stop = function () {
	if (this.reconnectionsHandler) {
		clearInterval(this.reconnectInterval);
		this.reconnectInterval = null;
	}
};

LoRaWANPoolManager.prototype.get = function (nodeId, config) {
	var me = this;
	var loraWAN = this.openConnections[config.id];

	if (!loraWAN) {
		loraWAN = new LoRaWAN(config);
		me.openConnections[config.id] = me.disconnected[config.id] = loraWAN;

		loraWAN.on('disconnect' + config.id, function () {
			me.disconnected[config.id] = true;
		});

		loraWAN.on('open' + config.id, function () {
			delete me.disconnected[config.id];
		});

	}
	me.emit('lorawan' + nodeId, loraWAN);
};

LoRaWANPoolManager.prototype.cleanUp = function (cb) {
	var loraWANKeys = Object.keys(this.openConnections);
	var me = this;
	this.stop();
	if (loraWANKeys.length > 0) {
		var loraWAN = this.openConnections[loraWANKeys[0]];
		delete this.openConnections[loraWANKeys[0]];
		loraWAN.close(function (err) {
			me.cleanUp(cb);
		});
	} else {
		cb();
	}
};

module.exports = LoRaWANPoolManager;