read csv-data and put it in an array

[Perlchamp]

hallo sam :-)
i have now this in my node_helper.js:

var NodeHelper = require("node_helper");

// add require of other javascripot components here
// var xxx = require('yyy'); here
const csv = require("csvtojson");
const csvFilePath = this.path + 'birthdaylist.csv';


module.exports = NodeHelper.create({

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

	start() {
		console.log("Starting module helper: ${this.name}");
		console.log("dieser Pfad: ${this.path}");
		
		csv()
		.fromFile(csvFilePath)
		.then((jsonObj)=>{
			console.log(jsonObj);
		})

	},

/*
	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) {
		console.log(this.name + " received a socket notification: " + notification + " - Payload: " + 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") {
		}

	},

});

terminal says:

Unhandled rejection Error: File does not exist. Check to make sure the file path to your csv is correct.
    at /home/dirk/MagicMirror/node_modules/csvtojson/v2/Converter.js:81:37
    at suppressedCallback (fs.js:209:5)
    at FSReqCallback.oncomplete (fs.js:153:23)

it’s from your SampleModule …

1. how can i see the console.log statements in the browser, starting MM ?
2. did i enter the code in the right place?
3. if I enter the following into the terminal window:
   node console.log (‘path: $ {this.path}’)
   i got an error message:
   bash: Syntaxerror unexpected word `(’
   what am I doing wrong ?

many thanks in advance

[sdetweil]

@Perlchamp said in read csv-data and put it in an array:

• how can i see the console.log statements in the browser, starting MM ?
  cannot see node_helper messages in browser, must look in the terminal window where u did npm start
  you can redirect those messages to a file
  npm start >somefile
  and then look at somefile live with editor

• did i enter the code in the right place?
  const csvFilePath = this.path + ‘birthdaylist.csv’;
  u have this.path outside the NodeHelper.create, at that time ‘this’ does not exist
  ‘this’ means ‘instance of’, and u are outside the thing that creates the instance

• if I enter the following into the terminal window:

because u are not running in magic mirror , ‘this’ does not exist
node console.log (‘path: $ {this.path}’)

• i got an error message:
• bash: Syntaxerror unexpected word `(’
  what am I doing wrong…
  bash would not see any ( unless u put it on the line with node

node (something)
that is a command to bash (the terminal window program, he has his own rules about parens, and other special characters (* means ALL filenames in this folder for example!)

I never ever use $ in node_helper (or anywhere else)
I would do this
console.log (‘path: '+ this.path)

[Perlchamp]

thank you. ok, i will test …

only for your information:

start() {
		console.log(`Starting module helper: ${this.name}`);
	},

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

this is from your SampleModule. i’m not here to reprimand you. it should only be information. so please do not misunderstand.

[sdetweil]

@Perlchamp thanks… will fix… never copy from another without review!!

[Perlchamp]

always my pleasure

[sdetweil]

@Perlchamp fixed

[sdetweil]

if u redirect the output of npm start to a file, this is what you will see in the file

> magicmirror@2.11.0 start /home/sam/MagicMirror
> DISPLAY="${DISPLAY:=:0}" ./node_modules/.bin/electron js/electron.js

[2020-04-30 11:15:53.521] [LOG]    Starting MagicMirror: v2.11.0
[2020-04-30 11:15:53.524] [LOG]    Loading config ...
[2020-04-30 11:15:53.526] [LOG]    Loading module helpers ...
[2020-04-30 11:15:53.528] [LOG]    Initializing new module helper ...
[2020-04-30 11:15:53.528] [LOG]    Module helper loaded: MMM-Logging
[2020-04-30 11:15:53.529] [LOG]    No helper found for module: alert.
[2020-04-30 11:15:53.529] [LOG]    No helper found for module: clock.
[2020-04-30 11:15:53.663] [LOG]    Initializing new module helper ...
[2020-04-30 11:15:53.663] [LOG]    Module helper loaded: MyCovid19
[2020-04-30 11:15:53.784] [LOG]    Initializing new module helper ...
[2020-04-30 11:15:53.785] [LOG]    Module helper loaded: MMM-AlexaControl
[2020-04-30 11:15:53.786] [LOG]    handler helper in init
[2020-04-30 11:15:53.786] [LOG]    Module helper loaded: MMM-SleepWake
[2020-04-30 11:15:53.786] [LOG]    All module helpers loaded.
[2020-04-30 11:15:53.820] [LOG]    Starting server on port 8090 ... 
[2020-04-30 11:15:53.821] [INFO]   You're using a full whitelist configuration to allow for all IPs
[2020-04-30 11:15:53.823] [LOG]    Server started ...
[2020-04-30 11:15:53.823] [LOG]    Connecting socket for: MMM-Logging
[2020-04-30 11:15:53.824] [LOG]    Module helper started for MMM-Logging
[2020-04-30 11:15:53.824] [LOG]    Connecting socket for: MyCovid19
[2020-04-30 11:15:53.824] [LOG]    Starting node_helper for module: MyCovid19
[2020-04-30 11:15:53.824] [LOG]    path=/home/sam/MagicMirror/modules/MyCovid19
[2020-04-30 11:15:53.824] [LOG]    Connecting socket for: MMM-AlexaControl
[2020-04-30 11:15:53.824] [LOG]    MMM-AlexaControl helper, started...
[2020-04-30 11:15:53.824] [LOG]    Connecting socket for: MMM-SleepWake
[2020-04-30 11:15:53.825] [LOG]    handler helper in start
[2020-04-30 11:15:53.825] [LOG]    Sockets connected & modules started ...
[2020-04-30 11:15:53.906] [LOG]    Launching application.
[2020-04-30 11:15:53.928] [LOG]    setup for latent showing  // < --- from my module node_helper
[2020-04-30 11:15:54.487] [LOG]    requested file exists=modules/MyCovid19/states-rawdata-04-30-2020 sending back to module_13_MyCovid19_5731  // < --- from my module node_helper
[2020-04-30 11:15:54.490] [LOG]    requested file exists=modules/MyCovid19/countries-rawdata-04-30-2020 sending back to module_16_MyCovid19_7951  // < --- from my module node_helper
[2020-04-30 11:15:54.492] [LOG]    requested file exists=modules/MyCovid19/countries-rawdata-04-30-2020 sending back to module_14_MyCovid19_1721  // < --- from my module node_helper
[2020-04-30 11:15:54.493] [LOG]    requested file exists=modules/MyCovid19/countries-rawdata-04-30-2020 sending back to module_15_MyCovid19_91  // < --- from my module node_helper
[2020-04-30 11:15:54.498] [LOG]    requested file exists=modules/MyCovid19/countries-rawdata-04-30-2020 sending back to module_17_MyCovid19_2191  // < --- from my module node_helper
etc

[Perlchamp]

ok, it’s slowly dawning on me, see little light at the end of the tunnel

[sdetweil]

@Perlchamp if u install the logging module I suggested, then it captures all the messages from the modulename.js in the browser and prints them to the terminal window log, which would be saved to the file as well.

[sdetweil]

@sdetweil a node_helper has two built in functions (I have never useed init() or stop() for anything, but they are available)

start: when the helper is loaded
socketNotificationReceived, when the modulename.js sends a message to the helper

the helper has one useful function

sendSocketNotification , to send a message back to the modulename.js

everything else is all up to you

note that the modulename.js gets the config.js config:{} info for this module, NOT the node_helper… so if the node_helper needs to know (filenames, timings, ???) , the modulename.js has to send a message with the this.config info down to the helper, and the helper has to save it to use later