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

(.com)

business
development
operations

have an idea

check that it’s profitable

apples oranges
are both fruit

web store book shop
are both businesses

financials

are important.

do them!

(conservative estimates are best)

check your tech

time is an expense

halve your deliverables

then halve them again

1-2 core features

write ideas down

development

Merb (merbivore.com)
development

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

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

development

bootstrap

$ sudo gem install merb-core merb-more
bootstrap

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

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

$ 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

$ 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 \"initial commit\"
bootstrap

$ 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 \"initial commit\"
s/bzr/git/g
bootstrap

merb-gen

$ merb &
merb-gen

$ merb &
$ merb-gen resource pub
merb-gen

$ merb &
$ merb-gen resource pub
$ bzr commit -m \"added merb-gen'd pub resource\"
merb-gen

$ merb &
$ merb-gen resource pub
$ bzr commit -m \"added merb-gen'd pub resource\"
$ vim spec/spec.opts spec/spec_helper.rb
merb-gen

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

...
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

run specs

$ rake spec:request
run specs

$ 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

request specs

$ vim spec/requests/pubs_spec.rb
request specs

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

run specs

$ rake spec:request
run specs

$ 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

haml

$ vim config/dependencies.rb
haml

$ vim config/dependencies.rb
...
dependency \"merb-haml\", merb_gems_version
haml

$ vim config/dependencies.rb
...
dependency \"merb-haml\", merb_gems_version
$ vim config/init.rb
haml

$ vim config/dependencies.rb
...
dependency \"merb-haml\", merb_gems_version
$ vim config/init.rb
...
use_template_engine :haml
haml

hamlise view

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

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

$ 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

$ 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!

model specs

$ vim spec/models/pubs_spec.rb
model specs

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

$ vim spec/models/pubs_spec.rb
1. it \"should have name, address, price\" 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

$ vim spec/models/pubs_spec.rb
2. it \"should handle different url formats\" 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

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

model specs

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

$ 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)] + \"'s Pub\"),
:price => (1..30).to_a[rand(30)],
:address => \"#{(40..166).to_a[rand(126)]} Spring \" + %w[Street Road Avenue][rand(3)],
:url => \"http://#{name.gsub(/\\W/, '').downcase}.com/\"
}
end
model specs

run specs

$ rake spec:models
run specs

$ 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

define properties

$ vim app/models/pub.rb
define properties

$ 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

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

run specs

$ rake spec:models
run specs

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

request specs

$ vim spec/requests/pubs_spec.rb
request specs

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

run specs

$ rake spec:request
run specs

$ 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

build partial

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

$ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
%div#cheapest
= partial \"cheapest\"
build partial

$ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
%div#cheapest
= partial \"cheapest\"
$ vim app/views/pubs/_cheapest.html.haml
build partial

$ vim app/views/pubs/index.html.haml
%h3 Nearest
%h3 Cheapest
%div#cheapest
= partial \"cheapest\"
$ 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 => \"price cheapest-#{index}\"}
= '$' + sprintf(\"%.2f\", pub.price)
build partial

run specs

$ rake spec:request
run specs

$ 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

nearest

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

$ vim app/views/pubs/index.html.haml
%h3 Nearest
%div#nearest
= partial \"nearest\"
%h3 Cheapest
%div#cheapest
= partial \"cheapest\"
nearest

$ vim app/views/pubs/index.html.haml
%h3 Nearest
%div#nearest
= partial \"nearest\"
%h3 Cheapest
%div#cheapest
= partial \"cheapest\"
$ vim app/views/pubs/_nearest.html.haml
nearest

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

global layout

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

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

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

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

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

$ vim public/javascripts/application.js
window.addEvent('domready', function() {
if (GBrowserIsCompatible()) {
var map = new GMap2($(\"map\"));
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

$ 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(\"<h4>\" + name + \"</h4>\" + ... );
map.addOverlay(marker);
}
});
}
custom geocoder

some stylesheet foo

slices
freezing
param-protection
action-args

operations

monitoring

collectd

lightweight
statistics
collection
daemon

lightweight
statistics
collection
daemon

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

<Plugin df>
MountPoint \"/\"
</Plugin>
<Plugin interface>
Interface \"eth0\"
Interface \"eth1\"
</Plugin>
...

<Plugin rrdtool>
DataDir \"/var/lib/collectd/rrd\"
CacheTimeout 180
CacheFlush 7200
</Plugin>
<Plugin network>
Server \"my.monitoring.server.net\"
# Port 25826
</Plugin>
...

<Plugin processes>
Process \"ruby\"
# Process \"mysqld\"
</Plugin>
...

eek!

collectd-nagios

$ /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;;;;

0 good
1 bad
2 ugly

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

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

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

configuration
management

Puppet
language => client/server => library

manifests
types
classes
nodes

manifests => describe
types
classes
nodes

manifests
types => manage
classes
nodes

package { apache2:
ensure => present
}

package { apache2:
ensure => present
}
file { \"/etc/apache2/apache2.conf\",
content => template(\"/etc/puppet/
config/classes/httpd_server/
httpd.conf.erb\"),
mode => 644
}

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

manifests
types => manage
classes
nodes

manifests
types
classes => group
nodes

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

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

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

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

manifests
types
classes => group
nodes

manifests
types
classes
nodes => apply

node \"srv01.skippy.com\" {
include passenger
}

node \"srv01.skippy.com\" {
include passenger
}

node \"srv01.skippy.com\" {
include passenger
}
node \"server02.skippy.com\" {
include passenger
}
node \"server03.skippy.com\" {
include passenger
}

node \"merbnode\" {
include passenger
}
node \"server01.skippy.com\" inherits passenger {}
node \"server02.skippy.com\" inherits passenger {}
node \"server03.skippy.com\" {
include customisation
}

versionable
infrastructure

versionable
infrastructure
(for free)

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

# puppetd --test --debug

resources

getting real
seth godin
wiki.merbivore.com

Thank you!
(and questions)