kuntoaji

// Tracking cursor position in real-time without JavaScript
// Demo: https://twitter.com/davywtf/status/1124146339259002881

package main

import (
	"fmt"
	"net/http"
	"strings"
)

kuntoaji

require "active_record"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Migration.class_eval do
  create_table(:records) do |t|
    t.string :column
  end
end

data = 50_000.times.map { |i| Hash[column: "Column #{i}"] }

kuntoaji

# lib/encryptor.rb
# Module to dynamic encrypt attributes per model
module Encryptor
  def has_encrypted_attributes(*attrs)
    attrs.each do |attr|
      # Define the dynamic getter
      define_method(attr) do
        self[attr].present? ? Encryptor.crypt.decrypt_and_verify(self[attr]) : self[attr]
      end
      # Define the dynamic setter

kuntoaji

This all applies to Ruby 2.1. In some cases a setting is not available in 2.0, this is noted. There is also a different with 1.9, 1.8, and REE --- these are not noted.

All the relevant code is in https://github.com/ruby/ruby/blob/trunk/gc.c

RUBY_HEAP_MIN_SLOTS

default: 10000

The number of heap slots to start out with. This should be set high enough so that your app has enough or almost enough memory after loading so that it doesn't have to allocate more memory on the first request (althogh this probably isn't such a big deal for most apps).

(todo: figure out how big a slot is. i think the answer can be infered from this code.)

kuntoaji

In August 2007 a hacker found a way to expose the PHP source code on facebook.com. He retrieved two files and then emailed them to me, and I wrote about the issue:

http://techcrunch.com/2007/08/11/facebook-source-code-leaked/

It became a big deal:

http://www.techmeme.com/070812/p1#a070812p1

The two files are index.php (the homepage) and search.php (the search page)