Making my first module: issue with notifications

[sdetweil]

did u open anther browser window with the MM loaded into it? it will start another instance of the the module.js (with its own counter)

[rico24]

@sdetweil Thank you!
It was because I opened one tab and then closed it, open a new one but the timer was still running indeed. When in the future I want to do something with the mechanisme I need to solve this ;)

Now I now how notifications work in practice, I can finish my own module :)

[sdetweil]

@rico24 u can also look at my sample module, which accesses config, does notifications,. etc

https://github.com/sdetweil/SampleModule

to fix the problem, you need to send the module identifier in the payload, and have different counters, stored by identifier… when u send back from the helper EVERY module gets notified at once,
so they need to look at the identifier returned to make sure the message is for them, and ignore others

[sdetweil]

this is what that would look like… as u want pages insulated from each other as well as module instances

module

/* Magic Mirror
 * Module: name of module
 * 
 */

//Register module
Module.register("MMM-DutchGarbageCalendar", {
  defaults: {
        foo: "I'm alive!"
  },
	ourpage: Math.ceil(Math.random() * 100),	
	count:{},
  
  //Start function
  start: function (){
  this.count[this.ourpage] = 0
},
  
  
 //getDom Function
  getDom: function() {
  var element = document.createElement("div")
  element.className = "myContent"
  element.innerHTML = "Hello, World! " + this.config.foo
  var subElement = document.createElement("p")
  subElement.id = "COUNT"
  element.appendChild(subElement)
  return element
},


//NotificationReceived 
notificationReceived: function(notification, payload, sender) {
        switch(notification) {
                case "DOM_OBJECTS_CREATED":
                        var timer = setInterval(()=>{
		        Log.log("send socket notificationR: DO_YOUR_JOB:"+this.count[this.ourpage])
			this.sendSocketNotification("DO_YOUR_JOB", {identifier: this.identifier+this.ourpage, value:this.count[this.ourpage]})
                                this.count[this.ourpage]++;
                        }, 5000)
                        break
        }
},
 
 //socketNotificationReceived
socketNotificationReceived: function(notification, payload) {
        switch(notification) {
                case "I_DID":
			if(payload.identifier== this.identifier+this.ourpage){
				var elem = document.getElementById("COUNT")
				elem.innerHTML = "Count:" + payload.value
				Log.log("socketReceived:" + JSON.stringify(payload))
			}
			else
		        	Log.log("notification not for us");
                        break
        }
},
})

helper

var NodeHelper = require('node_helper');
var request = require('request');
module.exports = NodeHelper.create({
		initial_counter:10000,

        start: function() {
					this.countDown = {} 				
				},

        socketNotificationReceived: function(notification, payload) {
                console.log("Payload: =" + JSON.stringify(payload));
                switch(notification){
                        case "DO_YOUR_JOB":
                  		if(!this.countDown.hasOwnProperty(payload.identifier+this.ourpage)){
					this.countDown[payload.identifier]=this.initial_counter;
				}
				let return_payload={identifier: payload.identifier, value:(this.countDown[payload.identifier] - payload.value)}
                                this.sendSocketNotification("I_DID",return_payload )
                                console.log("Payload 2: = " + JSON.stringify(return_payload));
                                break
                }
        },
});

[sdetweil]

@rico24 and here is an updated node_helper, that rejects connecting clients if they don’t send the right kind of identifier (ends with a digit)

var NodeHelper = require('node_helper');
var request = require('request');
module.exports = NodeHelper.create({
		initial_counter:10000,

        start: function() {
			this.countDown = {} 				
	},
	isDigit: function(x){
			return (x>='0' && x< ='9')  // watch out for spaces after < , forum hides it all
	},
        socketNotificationReceived: function(notification, payload) {
                console.log("Payload: =" + JSON.stringify(payload));
                switch(notification){
                        case "DO_YOUR_JOB":
				if(this.isDigit(payload.identifier.slice(-1))){
					if(!this.countDown.hasOwnProperty(payload.identifier+this.ourpage)){
				           this.countDown[payload.identifier]=this.initial_counter;
					}
				let return_payload={identifier: payload.identifier, value:(this.countDown[payload.identifier] - payload.value)}									 
                            this.sendSocketNotification("I_DID",return_payload )
			        console.log("Payload 2: = " + JSON.stringify(return_payload));
			}
			else
				this.sendSocketNotification("I_DID_REJECTED_INVALID_IDENTIFIER",payload )
                                break
                }
        },
});