Cool ruby gems to developing be easier and faster

1. Ruby gems
MeetUP @ Balabit
December 9, 2010
nucc@balabit.com

3. Do
Active
what I
Record
mean
Mysql RMagick
Ruby
Jabber
Git

4. Do
Active
what I
Record
mean
Mysql RMagick
Ruby
Jabber
Git

5. First steps
sudo apt-get install rubygems

6. First steps
sudo apt-get install rubygems
gem install git

7. First steps
sudo apt-get install rubygems
gem install git
require “rubygems”
require “git”
repo = Git.open “/work/scb”
repo.log.between ‘3.0.0’, ‘3.1.0’

8. http://haml-lang.com

9. HAML
#title <div id=”title”>
.left = @title <div class=”left”>
<%= @title %>
#content </div>
.author.strong </div>
%span{ :style => “float: left” }
Nucc <div id=”content”>
<div class=”author strong”>
.body.mobile <span style=”float: left”>
= @content.body Nucc
</span>
- if @content.footer? </div>
.footer.mobile <div class=”body mobile”>
= @content.footer <%= @content.body %>
</div>
- plain </div>
<span>Copyright</span>

10. http://sass-lang.com

11. SASS
HAML
$blue: #3bbfce .content-navigation {
$margin: 16px border-color: #3bbfce;
color: #2b9eab;
.content-navigation }
border-color: $blue
.border {
color: darken($blue, 9%)
padding: 8px;
margin: 8px;
.border border-color: #3bbfce;
padding: $margin / 2 }
margin: $margin / 2
border-color: $blue

12. SASS
HAML
@mixin table-base #data {
th float: left;
text-align: center margin-left: 10px;
font-weight: bold }
td, th #data th {
padding: 2px text-align: center;
font-weight: bold;
@mixin left($dist) }
float: left #data td, #data th {
margin-left: $dist padding: 2px;
}
#data
@include left(10px)
@include table-base

13. HPricot
http://hpricot.com

14. HPricot
require ‘rubygems’
require ‘hpricot’
html = Hpricot("<p id=’test_id’>A simple <span class=’bold’>test</span> string.</p>")
(html/”p”).inner_html
=> "A simple <span class="bold">test string.</b>"
(html/:p/:span).first.inner_html
=> “test”
(html/”#test_id”).inner_html
(html/”span.bold”).remove

15. HPricot
require ‘rubygems’
require ‘hpricot’
require ‘open-uri’
html = open("http://iosflashvideo.fw.hu/") { |f| Hpricot(f, :xhtml_strict => true) }
xpath
html.search("//a[@href='/donate']")
css
html.search("html > body > p img")
css to xpath
html.at("#header").xpath
#=> "//div[@id='header']"
xpath to css
html.at("//span").css_path
#=> "p > span:nth(0)"

16. Hpricot
jQuery
(html/"span.bold").set(:class => 'weight')
(html/”span.bold”).remove
Looping
(html/:span).each do |span|
span.attributes[‘class’] = “weight”
end

17. http://rspec.info

18. RSPEC
Behaviour Driven Development

19. RSPEC
Behaviour Driven Development
Describe a network interface!
It should have a host address.
It should have a network address.
It should have a gateway address.
The gateway and the host address must be in the same network.

20. RSPEC
describe Interface do
it “should have a host address” do
end
Behaviour Driven Development it “should have a network address” do
end
it “should have a gateway address” do
end
Describe a network interface!
it “gateway and host address...” do
It should have a host address. end
It should have a network address. end
It should have a gateway address.
The gateway and the host address must be in the same network.

21. RSPEC
describe Interface do
before :all do
@interface = Interface.new
end
before :each do
@interface.network = “10.30.0.0”
end
it “should have a host address” do
@interface.should respond_to :host
end
it “should be valid” do
# Rails model validation
@interface.should be_valid
end
after :each do
#do something
end
end

22. RSPEC
describe Interface do
describe :network
subject { @interface.network }
context “when netmask is 255.255.0.0” do
before { @interface.netmask = “255.255.0.0” }
it { should =~ /0.0$/}
end
context “when netmask is 255.0.0.0” do
before { @interface.netmask = “255.0.0.0” }
it { should =~ /0.0.0$/}
end
context “when gateway and host are not in the same network” do
# network address is 10.30.0.0/255.255.0.0 currently
before { @interface.gateway = “10.100.255.254” }
it { should =~ /^10.100/ }
specify { @interface.should not.be_valid }
end
end
end

23. RSPEC
Interface
network
when netmask is 255.255.0.0
should =~ /0.0$/
when netmask is 255.0.0.0
should =~ /0.0.0$/
when gateway and host are not in the same network
should =~ /^10.100/
should not be valid
expected: /0.0$/,
got: "10.30.0.1" (using =~)
Diff:
@@ -1,2 +1,2 @@
-/0.0$/
+"10.30.0.1"

24. http://cukes.info

25. Cucumber
Precondition Given
Action When
Postcondition Then

26. Cucumber
Feature: Network Connection
Managing network connections on intraweb
Scenario: Interface settings
Given an Interface
and its address is 10.30.0.34
and its network is 10.30.0.0
When the gateway is 10.100.255.254
Then its not valid

27. Cucumber
Feature: Network Connection
Managing network connections on intraweb
Scenario: Interface settings
Given an Interface
and its address is <IP>
and its network is <NETWORK>
When the gateway is <GATEWAY>
Then its <RESULT>
Examples:
| IP | NETWORK | GATEWAY | RESULT |
| 10.30.0.34 | 10.30.0.0 | 10.30.255.254 | VALID |
| 10.100.30.1 | 10.100.0.0 | 10.30.255.254 | NOT VALID |

28. Cucumber
Given an Interface
and its address is <IP>
and its network is <NETWORK>
Given /^an Interface$/ do
@interface = Interface.new
end
Given /address is (.*)$/ do |value|
@interface.address = value
end
Given /network is (.*)$/ do |value|
@interface.network = value
end

29. Cucumber
When the gateway is <GATEWAY>
Then its <RESULT>
When /^the gateway is (.*)$/ do |gw|
@interface.gateway = gw
end
Then /its (.*)$/ do |result|
@interface.validate.should == (result == “VALID”)
end

30. Cucumber
Jellemző: Összeadás
Azért, hogy elkerüljem a buta hibákat
amit diszkalkúliásként elkövethetek,
két szám összegét szeretném kiszámoltatni.
Forgatókönyv vázlat: Két szám összeadása
Amennyiben beütök a számológépbe egy <be_1>-est
És beütök a számológépbe egy <be_2>-est
Majd megnyomom az <gomb> gombot
Akkor eredményül <ki>-t kell kapnom
Példák:
| be_1 | be_2 | gomb | ki |
| 20 | 30 | add | 50 |
| 2 | 5 | add | 7 |
| 0 | 40 | add | 40 |
by gbence

31. Cucumber
Before do
@calc = Calculator.new
end
Ha /^beütök a számológépbe egy (d+)-(?:es|as|ös|ás)t$/ do |n|
@calc.push n.to_i
end
Majd /^megnyomom az (w+) gombot$/ do |op|
@result = @calc.send op
end
Akkor /^eredményül (.*)-(?:e|a|ö|á|)t kell kapnom$/ do |result|
@result.should == result.to_f
end

32. Cucumber
OH HAI: STUFFING
MISHUN: CUCUMBR
I CAN HAZ IN TEH BEGINNIN 3 CUCUMBRZ
WEN I EAT 2 CUCUMBRZ
DEN I HAS 2 CUCUMBERZ IN MAH BELLY
AN IN TEH END 1 CUCUMBRZ KTHXBAI
ICANHAZ /^IN TEH BEGINNIN (d+) CUCUMBRZ$/ do |n|
@basket = Basket.new(n.to_i)
end
WEN /^I EAT (d+) CUCUMBRZ$/ do |n|
@belly = Belly.new
@belly.eat(@basket.take(n.to_i))
end

33. OmniAuth
http://github.com/intridea/omniauth

34. OmniAuth
Facebook
Twitter
Google
LinkedIn
Foursquare
Meetup
OpenID

35. OmniAuth
/config/initializers/omniauth.rb
Rails.application.config.middleware.use OmniAuth::Builder do
provider :twitter, 'CONSUMER_KEY', 'CONSUMER_SECRET'
end

36. OmniAuth
/config/initializers/omniauth.rb
Rails.application.config.middleware.use OmniAuth::Builder do
provider :twitter, 'CONSUMER_KEY', 'CONSUMER_SECRET'
end
get /auth/twitter redirect
User
valid failed
/auth/twitter/callback /auth/failed

37. OmniAuth
auth_controller.rb
class AuthController < Application
def callback
auth_hash = request.env['omniauth.auth']
# auth_hash:
# {
# ‘uid’ => “12345”
# ‘provider’ => “twitter”
# ‘user_info’ => {
# ‘name’ => “User name”
# ‘nickname’ => “nick”,
# ...
# }
# }
end
...

38. Ruby C API
http://ruby-doc.org/docs/ProgrammingRuby/html/ext_ruby.html

39. class Test
def initialize
@array = Array.new
end
def add(anObject)
@array.push(anObject)
end
end

40. Ruby C
main.c
#include "ruby.h" class Test
static VALUE t_init(VALUE self) def initialize
{ @array = Array.new
VALUE array; end
array = rb_ary_new(); def add(anObject)
rb_iv_set(self, "@array", array); @array.push(anObject)
return self; end
}
end
static VALUE t_add(VALUE self, VALUE anObject)
{
VALUE array;
array = rb_iv_get(self, "@array");
rb_ary_push(array, anObject);
return array;
}
...

41. Ruby C
main.c
/* from the previous slide */ class Test
static VALUE t_init(VALUE self);
static VALUE t_add(VALUE self, VALUE anObject); def initialize
/* end */ @array = Array.new
end
VALUE cTest; def add(anObject)
@array.push(anObject)
void Init_Test() end
{
cTest = rb_define_class("Test", rb_cObject); end
rb_define_method(cTest, "initialize", t_init, 0);
rb_define_method(cTest, "add", t_add, 1);
}

42. Ruby C
extconf.rb
require 'mkmf'
create_makefile("Test")
nucc@rubybox ~ $ ruby extconf.rb
nucc@rubybox ~ $ make
nucc@rubybox ~ $ make install

43. Ruby C
my_test.rb
require “Test”
test = Test.new
test.add("Balabit Meetup")
p test
=> #<Test:0x100156548 @array=["Balabit Meetup"]>

45. require 'ftplib'
?
ftp = FTP.open('ftp.netlab.co.jp')
ftp.login
ftp.chdir('pub/lang/ruby')
puts ftp.dir
ftp.quit

46. on
yth
ubyP
R require 'ftplib'
?
ftp = FTP.open('ftp.netlab.co.jp')
ftp.login
ftp.chdir('pub/lang/ruby')
puts ftp.dir
ftp.quit

47. Questions?

48. Thank you!