Parse Cloud Front User Agents

app.js

fs = require('fs');
parse = require('user-agent-parser');
// parse('user agent string')

var total = 0,
  iOS = 0,
  iOS10 = 0,
  iOS9 = 0,
  Android = 0,
  AndroidChrome52 = 0,
  AndroidChrome53 = 0,
  AndroidOther = 0,
  nonMobile = 0;

fs.readFile('data2', 'utf8', function(err, data) {
  if (err) {
    return console.log(err);
  }
  let lines = data.split('\n');

  lines.forEach(function(line) {
    let words = line.split('\t');
    if (words[0] !== '2017-09-26') {
      return;
    }
    total += 1;

    let ua = decodeUA(words[10]);
    parsed = parse(ua);

    if (parsed.os.name === 'Android') {
      updateAndroidCounts(parsed);
    } else if (parsed.os.name === 'iOS') {
      updateiOSCounts(parsed);
    } else {
      nonMobile += 1;
    }
  });

  printVariables();
});

function decodeUA(ua) {
  try {
    return decodeURIComponent(decodeURIComponent(ua));
  } catch (e) {
    console.log(ua);
    return '';
  }
}

function updateAndroidCounts(parsed) {
  Android += 1;
  if (parsed.browser.name === 'Chrome') {
    let major = parseInt(parsed.browser.major);
    if (major >= 53) {
      AndroidChrome53 += 1;
    } else {
      AndroidChrome52 += 1;
    }
  } else {
    AndroidOther += 1;
  }
}

function updateiOSCounts(parsed) {
  iOS += 1;
  let version = parseInt(parsed.os.version);
  if (version >= 10) {
    iOS10 += 1;
  } else {
    iOS9 += 1;
  }
}

function printVariables() {
  console.log(`Total ${total}`);
  console.log(`iOS Total ${iOS}`);
  console.log(`iOS 10 or greater ${iOS10}`);
  console.log(`iOS 9 or less ${iOS9}`);
  console.log(`Android Total ${Android}`);
  console.log(`Android Chrome 53 or later ${AndroidChrome53}`);
  console.log(`Android Chrome 52 or earleir ${AndroidChrome52}`);
  console.log(`Android Non Chrome ${AndroidOther}`);
  console.log(`Non Mobile Total ${nonMobile}`);
  console.log(
    `Percentage that needs sprites ${(iOS9 + AndroidOther + AndroidChrome52) /
      total}`
  );
}