Node stream line by line close event

I am receiving a large file from an http post. I need to take each line from this file and insert it into a database. It is much faster to do this by inserting 500 or so lines at a time so this is what I have:

var readline = require('readline');

var insertSize = 500;
var records = [];

var reader = readline.createInterface({
  input: inputStream
});
reader.on('line', function(line) {
  reader.pause();
  var entry = line.split('\t');
  if (entry.length != 3) return reader.resume();

  records.push({
    first: entry[0],
    second: entry[1],
    third: entry[2]
  });

  if (records.length < insertSize) return reader.resume();

  database.create(records).exec(function (err) {
    if (err) return res.serverError(err);
    records.length = 0;
    reader.resume();
  });
});
reader.on('error', function(err) {
  return res.serverError(err);
});
reader.on('close', function() {
  database.create(records).exec(function (err) {
    if (err) return res.serverError(err);
    return res.ok();
  });
});

According to the documentation, the line and close event can still be triggered after pause(). I am seeing this happen, as the close event is triggered before the database.create() finishes in the line event. Is there a better way to handle this? line-by-line would be good but it can't take a stream as an input. Thanks.

via Alec Fenichel