Use iwconfig and extract signal and link quality to csv (nodejs)

wifi-power-sample.js

var exec = require('child_process').exec;
var argv = require('minimist')(process.argv.slice(2));
var stringify = require('csv-stringify');
var fs = require('fs');

function takeMesure(callback){
  exec('iwconfig wlan0', function(err, stdout, stderr){
    //console.log(stdout);
    var essid = /ESSID:"(.+)"/.exec(stdout),
    power = /Bit Rate=([0-9]+) +Mb\/s +Tx\-Power=([0-9]+) dBm/.exec(stdout),
    power_management = /Power Management:(.+)\n/.exec(stdout),
    quality = /Link Quality=([0-9]+)\/([0-9]+) +Signal level=(\-?[0-9]+) dBm/.exec(stdout);
    callback(err, {
      essid: essid[1],
      bit_rate : power[1],
      txpower: power[2],
      power_management: power_management[1],
      link_quality: quality[1],
      max_link_quality: quality[2],
      signal_level: quality[3]
    });
  });
};


function do_and_save(spotname){
  takeMesure(function(err, mesure){
    mesure.spotname = spotname;
    stringify([mesure], function(err, csvdata){
      fs.writeFileSync('./wifi_mesures.csv', csvdata, { flag: 'a' });
    });
  });
};

if(argv.init){
  stringify([['essid',
            'bit_rate',
            'txpower',
            'power_management',
            'link_quality',
            'max_link_quality',
            'signal_level', 'spotname']], function(err, csvdata){
              fs.writeFileSync('./wifi_mesures.csv', csvdata, { flag: 'a' });

            });
}else{
  do_and_save(argv.n);
}