read csv-data and put it in an array

[Perlchamp]

ok, thank you sam.
Now I have to process the whole thing first, otherwise my head will burst ;-) …

[Perlchamp]

this is the actual node_helper.js:

var NodeHelper = require("node_helper");
var moment = require("moment");

// add require of other javascripot components here
// var xxx = require('yyy'); here
const csv = require("csvtojson");

var birthdaysArray = [];


module.exports = NodeHelper.create({

	init(){
		console.log("init module helper perlchamp");
	},

	start() {
		console.log("Starting module helper: " + this.name);
		//console.log("Pfad zur csv-Datei: ", this.path + "/data/birthdays.csv");

		moment.locale(config.language);  // set locale
		
		// convert the csv-file into a JSON-String
		const csvFilePath = this.path + '/data/birthdays.csv';
		csv()
		.fromFile(csvFilePath)
		.then((jsonObj)=>{      
			birthdaysArray = JSON.stringify(jsonObj);
			
			// for debugging only
			//console.log("birthdaysArray: ", birthdaysArray);
			
			// send data to [modulname].js
			self.sendsocketNotification("have data", birthdaysArray)

			// loop thru the array of birthday_info from file (jsonObj),
			// one 'row' per birthday
		
		})		
	},
	

	stop(){
		console.log("Stopping module helper: " + this.name);
	},

	// handle messages from our module// each notification indicates a different messages
	// payload is a data structure that is different per message.. up to you to design this
	socketNotificationReceived(notification, payload) {				
		// if config message from module
		if (notification === "CONFIG") {
			// save payload config info
			this.config=payload
			// wait 15 seconds, send a message back to module
			setTimeout(()=> { this.sendSocketNotification("message_from_helper"," this is a test_message")}, 15000)
		}
		else if(notification === "????2") {
		}
	},
});

i got an error-message :

[2020-05-01 23:21:12.072] [WARN]   Unhandled rejection ReferenceError: self is not defined
    at /home/dirk/MagicMirror/modules/perlchamp/node_helper.js:34:4
  

i think this could be the problem:

// send data to [modulname].js
self.sendsocketNotification("have data", birthdaysArray)

i tried “this.” and without “self.” and “this.” but nothing changed. now i’m searching in the web, maybe i will found some answers ;-)

[Perlchamp]

// send data to [modulname].js
self.sendsocketNotification("have data", birthdaysArray)

i have found a typing error. Socket instead socket. if i than change self. to this. no errror messages will displayed. but still black screen.
maybe i did not understand how to handle the getDom-section … i will still try …
but:
i see no notification in the terminal. ‘have data’ should actually appear there, shouldn’t it ?

[sdetweil]

@Perlchamp

do this, you need self

start() {
		var self = this
		console.log("Starting module helper: " + this.name);

the use self

                self.sendsocketNotification("have data", jsonObj)

u need to send the obj, not the string

as for black screen , that means the modulename side died…

f12 on the keyboard or ctrl-shift-i, select the console tab, and look for red text … usually a syntax error…

[sdetweil]

@Perlchamp

i see no notification in the terminal. ‘have data’ should actually appear there, shouldn’t it ?

no, the message is sent to the modulename.js side of your module…
using my sample code , right here

        // messages received from from your node helper (NOT other modules or the system)
	// payload is a notification dependent data structure, up to you to design between module and node_helper
	socketNotificationReceived: function(notification, payload) {

[sdetweil]

the two parts look like this

--------------------------------------------------------------------------------------------------
|                                  browser  side                                                 |
|                                       modulename.js (SampleModule.js)                          |
|                                                                                                |
|     receive (socketNotificationReceived)                send ( sendSocketNotification)         |
--------------------------------------------------------------------------------------------------
                    ^                                                     |
                    |                                                     |
--------------------------------------------------------------------------------------------------
                    |                                                     |
                    |                                                     V 
--------------------------------------------------------------------------------------------------
|      send ( sendSocketNotification)                   receive (socketNotificationReceived)     |
|                                                                                                |
|                                       node_helper.js                                           |
|                                  server side                                                   |
--------------------------------------------------------------------------------------------------

[Perlchamp]

yes, i understood. here’s my perlchamp.js (only socketNitificationReceived)

	// messages received from from your node helper (NOT other modules or the system)
	// payload is a notification dependent data structure, up to you to design between module and node_helper
	socketNotificationReceived: function(notification, payload) {
		Log.log(this.name + " received a socket notification: " + notification + " - Payload: " + payload);
		if(notification === "message_from_helper"){
			this.config.message = payload;
			// tell mirror runtime that our data has changed,
			// we will be called back at GetDom() to provide the updated content
			this.updateDom(1000)
		}

		if(notification === "have data"){

			Log.log(this.name + " received a socket notification: " + notification + " - Payload: " + payload);
			
			var now = moment()
			var active_birthdays={}

			for( var birthday of payload) {
				// get 1st 5 chars of birthdate, thru month
				// we will use this as the key in the hash
				var birth_date = birthday.birth.subString(0,4)
				
				// for debugging only
				Log.log("Tag.Monat :", birth_date)
				
				// get the birthday as a moment in this year, for comparing
				var birth_date_moment = moment(birth_date + now.getYear(),"DD.MMYYYY")

				// u can add days to a moment object and then compare 
				//     if the birthdate is before that date (and after now)
				//     so within the next xx days

				// if the date is the same or later, don't use time of day
				if(birth_date.startOf('day').isSame(now.startOf('day')){

					// birthday is in this month
					// check the hash if we've seen anything for today yet
					// if we haven't see this date yet
					if(active_birthdays[birth_date] == undefined){
           
						//  create the holder for its info (array of 
						//		names) in the hash
						active_birthdays[birth_date] = []
					}
					// save the persons name on the list
					active_birthdays[birth_date].push(birthday.name)
				}
			}
     
			// tell MM to call and get our content
			self.updateDom();
		}     			
},

[sdetweil]

@Perlchamp very good… now, I didn’t test the code I wrote, so there are a couple errors…

but you should be able to see that code in the developers window, sources tab,
navigate on the left tree, modules, your module_name (which has to be perchamp,
folder, filename and the register at the top) all have to match)

[Perlchamp]

i can’t find … so everything’s right ?

[sdetweil]

@Perlchamp you should see an error like this

note that I put part of the module name in the filter field