testFileLastMondified.js

/* Usage:
 *
 * coolerInterval( func, interval, triggerOnceEvery);
 *
 *   - func : the function to trigger
 *   - interval : interval that will adjust itself overtime checking the clock time
 *   - triggerOnceEvery : trigger your function once after X adjustments (default to 1)
 *   - This script uses fs.stat to check the last modified time for a file
 *   - stats.mtime gives us the last modified time in miliseconds
 *   - We compare current time, date1 - and now, date 2 getting the time difference
 *   - we then use jsonfile from npm to write our new json data after the difference is
 *   - 1800 seconds (30 Minutes) or older. This script runs every Minute
 *   - Change runtime frequency via line 21 by chaning 1 to any timeframe 1 = 1 Minute
 */
var coolerInterval = function(func, interval, triggerOnceEvery) {
  // grab the starting time set next tick and count to 0
  var startTime = new Date().getTime(),
    nextTick = startTime,
    count = 0;
 // Set the Trigger timeframe - Onece Every Minute
  triggerOnceEvery = triggerOnceEvery || 1;
 // set up interval function
  var internalInterval = function() {
    // Adds a value and the variable and assigns the result to that variable.
    nextTick += interval;
    // add one (+1)
    count++;
    // If count matches line 21 fun the function and reset the count
    if (count == triggerOnceEvery) {
      func();
      count = 0;
    }
    // set the interval tick
    setTimeout(internalInterval, nextTick - new Date().getTime());
  };
  // run the function
  internalInterval();

};
// Run the function and code the file checks
coolerInterval(function() {

  console.log("Its been 60 Seconds");
  // we require fs to access the filesystem
  var fs = require('fs');
  // define now
  const now = new Date();
// use fs.stat to look up json modified date
fs.stat("/home/user/file.json", function(err, stats) {
    // Grab your modified time variable and set it
    var mtime = stats.mtime;
    // set date 1
    var date1 = mtime
    // set date 2
    var date2 = now
    // time difference in miliseconds
    var timeDiff = Math.abs(date2.getTime() - date1.getTime());
    // time difference in seconds
    var timeDiffInSecond = Math.ceil(timeDiff / 1000);
    //  Check if the time difference is 30 Minutes or Over
    if (timeDiffInSecond > "1800") {
      // Log the call to edit
      console.log("Its been 30 Minutes, clearing PWD! For shell 1")
      // Require jsonfile npm install jsonfile
      const jsonfile = require('jsonfile')
      // define our file
      const file = '/home/user/file.json'
      // present our data
      const obj = {
        data: 'data to write'
      }
      // write the data!
      jsonfile.writeFile(file, obj, function(err) {
        if (err) console.error(err)
      })
    }
  });
}, 1000, 60);