ptarjan

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

jonathan-beebe

# Close Xcode & the iOS Simulator

# http://stackoverflow.com/a/30940055
# Remove any old runtimes from this directory.
cd /Library/Developer/CoreSimulator/Profiles/Runtimes
# e.g.
sudo rm -rf iOS\ 8.1.simruntime

# http://stackoverflow.com/a/11790983
# Remove the download receipts for simulators you don't need anymore.

bitkidd

Before doing all this you have to create a bucket in your AWS console. Or just use AWS cli tool in order to create one.

• Install pip (if not installed already):

$ curl -O https://bootstrap.pypa.io/get-pip.py

• Install AWS cli tool:

$ sudo pip install awscli

jaceklaskowski

Rough Notes about CQRS and ES

Once upon a time…

I once took notes (almost sentence by sentence with not much editing) about the architectural design concepts - Command and Query Responsibility Segregation (CQRS) and Event Sourcing (ES) - from a presentation of Greg Young and published it as a gist (with the times when a given sentence was heard).

I then found other summaries of the talk and the gist has since been growing up. See the revisions to know the changes and where they came from (aka the sources).

It seems inevitable to throw Domain Driven Design (DDD) in to the mix.

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

dhh

# Original Rails controller and action
class EmployeesController < ApplicationController
  def create
    @employee = Employee.new(employee_params)
    
    if @employee.save
      redirect_to @employee, notice: "Employee #{@employee.name} created"
    else
      render :new
    end

sabcio

require 'jruby/profiler'

profile_data = JRuby::Profiler.profile do
  require 'sinatra'
end

profile_printer = JRuby::Profiler::GraphProfilePrinter.new(profile_data)
profile_printer.printProfile(STDOUT)

jbrowning

# The $provide service is used to override an injected dependency

# Bad - results in Error: [ng:areq] Argument 'fn' is not a function, got Object
module 'someModule', ($provide) ->
  $provide.value "SomeService", SomeMock

# Good
module 'someModule', ($provide) ->
  $provide.value "SomeService", SomeMock
  null

wycats

App.Router.map(function() {
  this.resource('post', { path: '/posts/:post_id' });
});

App.PostRoute = Ember.Route.extend({
  model: function(params) {
    return this.store.find('post', params.post_id);
  }
});

momolog

Spree::CheckoutController.class_eval do
  def ensure_checkout_allowed
    check = @order.checkout_allowed?
    unless check == true
      redirect_to spree.cart_path, :flash => {:error => I18n.t("checkout_allowed_errors.#{check}")}
    end
  end
end