schneems

What

A grouping of links for Router 2.0 related changes that went out. Compiled into one place to save space.

Other links

• FAQ article https://help.heroku.com/JJ3M1TOM/common-runtime-legacy-router-end-of-life-faq
• Devcenter Router article https://devcenter.heroku.com/articles/http-routing#legacy-router-and-router-2-0
• Router 2.0 and HTTP/2 Now Generally Available (blog post) https://www.heroku.com/blog/router-2dot0-http2-now-generally-available/
• Router 2.0: The Road to Beta (blog post) https://www.heroku.com/blog/router-2dot0-the-road-to-beta/

schneems

class Add
  attr_reader :result, :is_negative
  def initialize(a, b)
    @result = a + b
    @is_negative = @result < 0
  end
end


def add(a,b)

schneems

class PriorityQueue
  attr_reader :elements

  def initialize
    @elements = []
  end

  def <<(element)

schneems

~ $ gem install mysql2
Fetching mysql2-0.5.3.gem
Building native extensions. This could take a while...
ERROR:  Error installing mysql2:
	ERROR: Failed to build gem native extension.

    current directory: /app/vendor/ruby-2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.3/ext/mysql2
/app/vendor/ruby-2.6.5/bin/ruby -I /app/vendor/ruby-2.6.5/lib/ruby/2.6.0 -r ./siteconf20200417-12-1lo3zcx.rb extconf.rb
checking for rb_absint_size()... yes

schneems

$ time curl -L --fail --retry 5 --retry-delay 1 --connect-timeout 3 --max-time 30 -I https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/heroku-18/ruby-2.4.0.tgz
# => real 0m0.117s

$ cat <<EOF | ruby
  require 'net/http'
  require 'benchmark'

schneems

$ docker run -it --rm ruby:2.6 bash
root@22e145f8dfa6:/# gem install rails
Fetching concurrent-ruby-1.1.5.gem
Fetching thread_safe-0.3.6.gem
Fetching activesupport-5.2.3.gem
Fetching crass-1.0.4.gem
Fetching i18n-1.6.0.gem
Fetching tzinfo-1.2.5.gem
Fetching rack-2.0.7.gem
Fetching rack-test-1.1.0.gem

schneems

# frozen_string_literal: true

require "active_record"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.string :name, :email, :username, :password, :birthday, :foo, :bar, :baz, :dog_name
    t.timestamps null: false

schneems

    default: Requirement already satisfied (use --upgrade to upgrade): numpy in /usr/lib/python2.7/dist-packages
    default: Downloading/unpacking pandas
    default:   Running setup.py (path:/tmp/pip_build_root/pandas/setup.py) egg_info for package pandas
    default:     /tmp/easy_install-y78IR5/numpy-1.16.1/setup.py:390: UserWarning: Unrecognized setuptools command, proceeding with generating Cython sources and expanding templates
    default:       run_build = parse_setuppy_commands()
    default:     /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'python_requires'
    default:       warnings.warn(msg)
    default:     Traceback (most recent call last):
    default:       File "<string>", line 17, in <module>
    default:       File "/tmp/pip_build_root/pandas/setup.py", line 743, in <module>

schneems

# Ruby 2.6 introduced String#split that allows it to take a block instead of just returning an array
# https://twitter.com/schneems/status/1078848803694882817

require 'benchmark/ips'

STRANG = "hello/there/hi/how/are/you/today".freeze

Benchmark.ips do |x|
  x.report("normal") { first_strang = STRANG.split("/".freeze).first }
  x.report("new   ") {

schneems

require 'capybara'

Capybara.register_driver :selenium_chrome_headless_no_scroll do |app|
  Capybara::Selenium::Driver.load_selenium
  browser_options = ::Selenium::WebDriver::Chrome::Options.new
  browser_options.args << '--headless'
  browser_options.args << '--disable-gpu' if Gem.win_platform?
  browser_options.args << '--hide-scrollbars'

  Capybara::Selenium::Driver.new(app, browser: :chrome, options: browser_options)