1. Your own gem (little)
building an online business with Ruby
Lindsay Holmwood <lindsay@holmwood.id.au>

7. (.com)

8. business
development
operations

9. have an idea

10. check that it’s profitable

11. apples oranges
are both fruit

12. web store book shop
are both businesses

13. financials

14. are important.

15. do them!

16. (conservative estimates are best)

17. check your tech

18. time is an expense

19. halve your deliverables

20. then halve them again

21. 1-2 core features

22. write ideas down

24. development

25. Merb (merbivore.com)
development

26. Merb (merbivore.com)
DataMapper (datamapper.org)
development

27. Merb (merbivore.com)
DataMapper (datamapper.org)
MooTools (mootools.net)
development

28. development

29. bootstrap

30. $ sudo gem install merb-core merb-more
bootstrap

31. $ sudo gem install merb-core merb-more
$ sudo gem install dm-core dm-more do_sqlite3
bootstrap

32. $ sudo gem install merb-core merb-more
$ sudo gem install dm-core dm-more do_sqlite3
$ merb-gen app schoonerwatch.com
bootstrap

33. $ sudo gem install merb-core merb-more
$ sudo gem install dm-core dm-more do_sqlite3
$ merb-gen app schoonerwatch.com
$ cd schoonerwatch.com
bootstrap

34. $ sudo gem install merb-core merb-more
$ sudo gem install dm-core dm-more do_sqlite3
$ merb-gen app schoonerwatch.com
$ cd schoonerwatch.com
$ bzr init ; bzr add
$ bzr commit -m quot;initial commitquot;
bootstrap

35. $ sudo gem install merb-core merb-more
$ sudo gem install dm-core dm-more do_sqlite3
$ merb-gen app schoonerwatch.com
$ cd schoonerwatch.com
$ bzr init ; bzr add
$ bzr commit -m quot;initial commitquot;
s/bzr/git/g
bootstrap

36. merb-gen

37. $ merb &
merb-gen

38. $ merb &
$ merb-gen resource pub
merb-gen

39. $ merb &
$ merb-gen resource pub
$ bzr commit -m quot;added merb-gen'd pub resourcequot;
merb-gen

40. $ merb &
$ merb-gen resource pub
$ bzr commit -m quot;added merb-gen'd pub resourcequot;
$ vim spec/spec.opts spec/spec_helper.rb
merb-gen

41. --colour
--format
profile
spec/spec.opts

42. ...
Spec::Runner.configure do |config|
config.include(Merb::Test::ViewHelper)
config.include(Merb::Test::RouteHelper)
config.include(Merb::Test::ControllerHelper)
end
DataMapper.auto_migrate!
spec/spec_helper.rb

43. run specs

44. $ rake spec:request
run specs

45. $ rake spec:request
.**......
Pending:
resource(:pubs) GET contains a list of pubs (TODO)
Called from ./spec/requests/pubs_spec.rb:21
resource(:pubs) GET has a list of pubs (TODO)
Called from ./spec/requests/pubs_spec.rb:33
Finished in 0.322787 seconds
9 examples, 0 failures, 2 pending
run specs

46. request specs

47. $ vim spec/requests/pubs_spec.rb
request specs

48. $ vim spec/requests/pubs_spec.rb
...
it quot;contains a sorted list of pubsquot; do
@response.should have_xpath(quot;//h3[contains(.,'Cheapest')]quot;)
@response.should have_xpath(quot;//h3[contains(.,'Nearest')]quot;)
end
request specs

49. run specs

50. $ rake spec:request
run specs

51. $ rake spec:request
Pending:
resource(:pubs) GET has a list of pubs (TODO)
Called from ./spec/requests/pubs_spec.rb:33
1)
'resource(:pubs) GET contains a sorted list of pubs' FAILED
expected following text to match xpath //h3[contains(.,'Cheapest')]’
./spec/requests/pubs_spec.rb:21:
Finished in 0.411139 seconds
9 examples, 1 failure, 1 pending
run specs

52. haml

53. $ vim config/dependencies.rb
haml

54. $ vim config/dependencies.rb
...
dependency quot;merb-hamlquot;, merb_gems_version
haml

55. $ vim config/dependencies.rb
...
dependency quot;merb-hamlquot;, merb_gems_version
$ vim config/init.rb
haml

56. $ vim config/dependencies.rb
...
dependency quot;merb-hamlquot;, merb_gems_version
$ vim config/init.rb
...
use_template_engine :haml
haml

57. hamlise view

58. $ bzr mv app/views/pubs/index.html.erb
app/views/pubs/index.html.haml
hamlise view

59. $ bzr mv app/views/pubs/index.html.erb
app/views/pubs/index.html.haml
$ vim app/views/pubs/index.html.haml
hamlise view

60. $ bzr mv app/views/pubs/index.html.erb
app/views/pubs/index.html.haml
$ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
hamlise view

61. $ bzr mv app/views/pubs/index.html.erb
app/views/pubs/index.html.haml
$ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
$ rake spec:request
Pending:
resource(:pubs) GET has a list of pubs (TODO)
Called from ./spec/requests/pubs_spec.rb:33
Finished in 0.389194 seconds
9 examples, 0 failures, 1 pending
hamlise view tests pass!

62. model specs

63. $ vim spec/models/pubs_spec.rb
model specs

64. $ vim spec/models/pubs_spec.rb
1.
model specs

65. $ vim spec/models/pubs_spec.rb
1. it quot;should have name, address, pricequot; do
@pubs.each do |pub|
pub.name.should_not be_nil
pub.address.should_not be_nil
pub.price.should_not be_nil
end
end
model specs

66. $ vim spec/models/pubs_spec.rb
2. it quot;should handle different url formatsquot; do
@pubs.each do |pub|
pub.url = 'mygreatpub.com.au'
pub.save.should be_true
pub.url = 'http://mygreatpub.com.au/'
pub.save.should be_true
end
end
model specs

67. $ vim spec/models/pubs_spec.rb
3. it quot;should consistently format + store urlsquot; do
@pubs.each do |pub|
adjective = %w[great swanky awesome stylish][rand(4)]
pub.url = quot;#{adjective}pub.com.auquot;
pub.save.should be_true
pub.url.should =~ /^http://.+/$/
end
end
model specs

68. model specs

69. $ vim spec/models/pubs_spec.rb
before(:each) do
@pubs = 10.of { Pub.generate }
end
model specs

70. $ vim spec/models/pubs_spec.rb
before(:each) do
@pubs = 10.of { Pub.generate }
end
$ vim spec/spec_fixtures.rb
require 'dm-sweatshop'
Pub.fixture do
{
:name => ( name = %w[John Jane Jerry Justin][rand(4)] + quot;'s Pubquot;),
:price => (1..30).to_a[rand(30)],
:address => quot;#{(40..166).to_a[rand(126)]} Spring quot; + %w[Street Road Avenue][rand(3)],
:url => quot;http://#{name.gsub(/W/, '').downcase}.com/quot;
}
end
model specs

71. run specs

72. $ rake spec:models
run specs

73. $ rake spec:models
1)
NameError in 'Pub should have name, address, price'
address= is not a public property
2)
NameError in 'Pub should handle different url formats'
address= is not a public property
3)
NameError in 'Pub should consistently format + store urls'
address= is not a public property
Finished in 0.252169 seconds
3 examples, 3 failures
run specs

74. define properties

75. $ vim app/models/pub.rb
define properties

76. $ vim app/models/pub.rb
class Pub
include DataMapper::Resource
property :id, Serial
property :name, String, :nullable => false
property :address, String, :nullable => false
property :price, BigDecimal, :nullable => false
property :url, String
define properties

77. $ vim app/models/pub.rb
...
def url=(string)
string = quot;http://#{string}quot; unless string =~ /^http://.+//
string += '/' unless string =~ //$/
@url = string
end
end
custom setter

78. run specs

79. $ rake spec:models
run specs

80. $ rake spec:models
Finished in 0.488351 seconds
3 examples, 0 failures
run specs win!

81. request specs

82. $ vim spec/requests/pubs_spec.rb
request specs

83. $ vim spec/requests/pubs_spec.rb
...
it quot;contains a list of cheapest pubsquot; do
@response.should have_xpath(quot;//div[@id=’cheapest’]quot;)
@response.should have_xpath(quot;//div[@id=’cheapest’]//table//tr//td[@class='name']quot;)
@response.should have_xpath(quot;//div[@id=’cheapest’]//table//tr//td[@class='address']quot;)
@response.should have_xpath(quot;//div[@id=’cheapest’]//table//tr//td[contains(@class,'price')]quot;)
end
request specs

84. run specs

85. $ rake spec:request
run specs

86. $ rake spec:request
Pending:
resource(:pubs) GET has a list of pubs (TODO)
Called from ./spec/requests/pubs_spec.rb:37
1)
'resource(:pubs) GET contains a list cheapest pubs' FAILED
expected following text to match xpath //div[@id='cheapest']
./spec/requests/pubs_spec.rb:26:
Finished in 0.411139 seconds
10 examples, 1 failure, 1 pending
run specs

87. build partial

88. $ vim app/views/pubs/index.html.haml
build partial

89. $ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
%div#cheapest
= partial quot;cheapestquot;
build partial

90. $ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
%div#cheapest
= partial quot;cheapestquot;
$ vim app/views/pubs/_cheapest.html.haml
build partial

91. $ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
%div#cheapest
= partial quot;cheapestquot;
$ vim app/views/pubs/_cheapest.html.haml
%table
- @pubs.each_with_index do |pub, index|
%tr
%td.name= link_to pub.name, pub.url
%td.address= pub.address
%td{:class => quot;price cheapest-#{index}quot;}
= '$' + sprintf(quot;%.2fquot;, pub.price)
build partial

92. run specs

93. $ rake spec:request
run specs

94. $ rake spec:request
Pending:
resource(:pubs) GET has a list of pubs (TODO)
Called from ./spec/requests/pubs_spec.rb:37
Finished in 0.854704 seconds
10 examples, 0 failures, 1 pending
run specs

95. nearest

96. $ vim app/views/pubs/index.html.haml
nearest

97. $ vim app/views/pubs/index.html.haml
%h3 Nearest
%div#nearest
= partial quot;nearestquot;
%h3 Cheapest
%div#cheapest
= partial quot;cheapestquot;
nearest

98. $ vim app/views/pubs/index.html.haml
%h3 Nearest
%div#nearest
= partial quot;nearestquot;
%h3 Cheapest
%div#cheapest
= partial quot;cheapestquot;
$ vim app/views/pubs/_nearest.html.haml
nearest

99. $ vim app/views/pubs/index.html.haml
%h3 Nearest
%div#nearest
= partial quot;nearestquot;
%h3 Cheapest
%div#cheapest
= partial quot;cheapestquot;
$ vim app/views/pubs/_nearest.html.haml
%div#map{:style => quot;width: 800px; height: 600px; margin: auto;quot;}
nearest

100. global layout

101. $ vim app/views/layout/application.html.erb
global layout

102. $ vim app/views/layout/application.html.erb
<%= js_include_tag 'mootools' %>
<%= js_include_tag 'SimpleTabs' %>
<%= js_include_tag 'application' %>
<script src=quot;http://maps.google.com/maps?file=api&amp;v=2&amp;key=
<%= Merb.config.gmaps_api_key %>quot; type=quot;text/javascriptquot;></script>
global layout

103. $ vim app/views/layout/application.html.erb
<%= js_include_tag 'mootools' %>
<%= js_include_tag 'SimpleTabs' %>
<%= js_include_tag 'application' %>
<script src=quot;http://maps.google.com/maps?file=api&amp;v=2&amp;key=
<%= Merb.config.gmaps_api_key %>quot; type=quot;text/javascriptquot;></script>
$ vim config/environments/development.rb
c[:gmaps_api_key] = quot;fooquot;
api key

104. $ vim app/views/layout/application.html.erb
<%= js_include_tag 'mootools' %>
<%= js_include_tag 'SimpleTabs' %>
<%= js_include_tag 'application' %>
<script src=quot;http://maps.google.com/maps?file=api&amp;v=2&amp;key=
<%= Merb.config.gmaps_api_key %>quot; type=quot;text/javascriptquot;></script>
$ vim config/environments/production.rb
c[:gmaps_api_key] = quot;barquot;
production api key

105. $ vim public/javascripts/application.js
window.addEvent('domready', function() {
});
nearest

106. $ vim public/javascripts/application.js
window.addEvent('domready', function() {
if (GBrowserIsCompatible()) {
var map = new GMap2($(quot;mapquot;));
map.enableScrollWheelZoom();
map.setCenter(new GLatLng(-33.86336, 151.207151), 12);
var geocoder = new GClientGeocoder();
/* geocode top-ten addresses */
$$('div#cheapest tr').each( function(element) {
showAddress(map, geocoder, element);
});
}
});
dash o’ javascript

107. $ vim public/javascripts/application.js
function showAddress(map, geocoder, element) {
var name = element.getElements('td.name a').get('html');
var address = element.getChildren('td.address').get('html');
var price = element.getElements('td.price').get('html');
var link = element.getElements('td.name a').get('href');
geocoder.getLatLng(address, function(point) {
if (point) {
var marker = new GMarker(point);
marker.bindInfoWindowHtml(quot;<h4>quot; + name + quot;</h4>quot; + ... );
map.addOverlay(marker);
}
});
}
custom geocoder

108. some stylesheet foo

111. slices
freezing
param-protection
action-args

112. operations

113. monitoring

114. collectd

115. lightweight
statistics
collection
daemon

116. lightweight
statistics
collection
daemon

122. LoadPlugin cpu
LoadPlugin df
LoadPlugin disk
LoadPlugin interface
LoadPlugin load
LoadPlugin memory
LoadPlugin network
LoadPlugin processes
LoadPlugin rrdtool
LoadPlugin socket
LoadPlugin swap
LoadPlugin users
...

123. <Plugin df>
MountPoint quot;/quot;
</Plugin>
<Plugin interface>
Interface quot;eth0quot;
Interface quot;eth1quot;
</Plugin>
...

124. <Plugin rrdtool>
DataDir quot;/var/lib/collectd/rrdquot;
CacheTimeout 180
CacheFlush 7200
</Plugin>
<Plugin network>
Server quot;my.monitoring.server.netquot;
# Port 25826
</Plugin>
...

125. <Plugin processes>
Process quot;rubyquot;
# Process quot;mysqldquot;
</Plugin>
...

129. eek!

130. collectd-nagios

131. $ /usr/bin/collectd-nagios
-s /var/run/collectd/socket
-n cpu-0/cpu-idle
-H my.server.com
-w 40: -c 10:
0 critical, 1 warning, 0 okay | value=34.000000;;;;
$ /usr/bin/collectd-nagios
-s /var/run/collectd/socket
-n df/df-root -H my.server.com
-d free -c 314572800: -w 524288000:
0 critical, 0 warning, 1 okay |free=924288000.0;;;;

132. 0 good
1 bad
2 ugly

133. $ ls /var/lib/collectd/rrd/my.server.com
cpu-0 cpu-1 df disk-sda
disk-sda1 interface load
memory swap users

134. apache apcups apple sensors
ascent battery cpu
cpufreq csv df
disk dns email
entropy exec filecount
hddtemp interface iptables
ipmi ipvs irqs
libvirt load logfile
mbmon memcached memory
multimeter mysql netlink
network nfs nginx
notify_desktop notify_email ntpd
nut onewire perl
ping postgresql powerdns
processes rrdtool sensors
serial snmp swap
syslog tail tape
tcpconns teamspeak2 thermal
unixsock users uuid
vmem vserver wireless

135. apache apcups apple sensors
ascent battery cpu
cpufreq csv df
disk dns email
entropy exec filecount
hddtemp interface iptables
ipmi ipvs irqs
libvirt load logfile
mbmon memcached memory
multimeter mysql netlink
network nfs nginx
notify_desktop notify_email ntpd
nut onewire perl
ping postgresql powerdns
processes rrdtool sensors
serial snmp swap
syslog tail tape
tcpconns teamspeak2 thermal
unixsock users uuid
vmem vserver wireless

137. configuration
management

140. Puppet
language => client/server => library

141. manifests
types
classes
nodes

142. manifests => describe
types
classes
nodes

143. manifests
types => manage
classes
nodes

144. package { apache2:
ensure => present
}

145. package { apache2:
ensure => present
}
file { quot;/etc/apache2/apache2.confquot;,
content => template(quot;/etc/puppet/
config/classes/httpd_server/
httpd.conf.erbquot;),
mode => 644
}

146. package { apache2:
ensure => present
}
file { quot;/etc/apache2/apache2.confquot;,
content => template(quot;/etc/puppet/
config/classes/httpd_server/
httpd.conf.erbquot;),
mode => 644
}
service { apache2:
ensure => running,
subscribe => File[quot;/etc/apache2/
apache2.confquot;]
}

147. manifests
types => manage
classes
nodes

148. manifests
types
classes => group
nodes

149. package { apache2:
ensure => present
}
# ...

150. class apache2 {
package { apache2:
ensure => present
}
# ...
}

151. class passenger inherits apache2 {
package { libapache2-mod-passenger:
ensure => present
}
# ...
}

152. define apache2 ($port) {
package { apache2:
ensure => present
}
# ...
}

153. manifests
types
classes => group
nodes

154. manifests
types
classes
nodes => apply

155. node quot;srv01.skippy.comquot; {
include passenger
}

158. node quot;srv01.skippy.comquot; {
include passenger
}

159. node quot;srv01.skippy.comquot; {
include passenger
}
node quot;server02.skippy.comquot; {
include passenger
}
node quot;server03.skippy.comquot; {
include passenger
}

160. node quot;merbnodequot; {
include passenger
}
node quot;server01.skippy.comquot; inherits passenger {}
node quot;server02.skippy.comquot; inherits passenger {}
node quot;server03.skippy.comquot; {
include customisation
}

161. versionable
infrastructure

162. versionable
infrastructure
(for free)

163. $ cd skippy.puppet.lindsay
$ git init
# puppet magic happens
$ git push

164. # puppetd --test --debug

166. resources

167. getting real
seth godin
wiki.merbivore.com

168. Thank you!
(and questions)