pcreux

Failsafe

When something goes wrong I want to degrade the user experience (instead of returning a 500 - Server Error) And I want to be notified about the failure

Usage

Wrap non mission critical code:

pcreux

class Size
  include Comparable

  def initialize(str)
    unless ALL_STRS.include? str
      raise ArgumentError, "#{str} is not a valid size"
    end

    @str = str
  end

pcreux

class Bottles
  def verse(current)
    <<-VERSE
#{bottles(current).capitalize} of beer on the wall, #{bottles(current)} of beer.
#{take_one_down(current)}, #{bottles((current - 1) % 100)} of beer on the wall.
VERSE
  end

  def verses(start, finish)
    (finish..start).to_a.reverse.map { |number| verse(number) }.join("\n")

pcreux

#!/usr/local/env ruby
#
# Generate html traces from CircleCI workflows
#

require 'json'
require 'http'

OWNER = 'githubowner'
REPO = 'githubrepo'

pcreux

curl "https://sendgrid.com/api/mail.send.json?api_user=YOUR_USER&api_key=YOUR_API_KEY&to=recipient@example.com&from=sender@example.com&subject=Import+done&text=Done"

pcreux

# specs and cukes results are stored in JUnit format under test-reports
if (grep 'failures="[^0]"' test-reports/* || grep 'errors="[^0]"' test-reports/*); then
  curl -H "Authorization: token MY_TOKEN" --request POST --data '{"state": "failure", "description": "Failed!", "target_url": "${bamboo.buildResultsUrl}"}' https://api.github.com/repos/USER/REPO/statuses/${bamboo.repository.revision.number} > /dev/null
else
  curl -H "Authorization: token MY_TOKEN" --request POST --data '{"state": "success", "description": "Success!", "target_url": "${bamboo.buildResultsUrl}"}' https://api.github.com/repos/USER/REPO/statuses/${bamboo.repository.revision.number} > /dev/null
fi

pcreux

# Elixir has pipes `|>`. Let's try to implement those in Ruby.
#
# I want to write this:
#
#   email.body | RemoveSignature | HighlightMentions | :html_safe
#
# instead of:
#
#   HighlightMentions.call(RemoveSignature.call(email.body)).html_safe
#

pcreux

pcreux

Robust Rails Apps

Philippe Creux - @pcreux

#vanruby - March 29th, 2017

pcreux

# no ruby gems required