Railsconf2014

RAILS AS  
AN SOA CLIENT
Pete Hodgson | @ph1 | [email protected]

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@ph1
rails
DB
DB
rails
app

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@ph1
rails
a
service
a
service
DB
DB
rails
app

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@ph1
rails
a
service
a
service a
service
a
service
DB
DB
rails
app

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@ph1
rails
a
service
a
service a
service
a
service
rails
app

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me me me
Pete Hodgson
Consultant at ThoughtWorks
@ph1
blog.thepete.net

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@ph1
ACT ONE
INDEPENDENCE
CO-DEPENDENCE
and

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@ph1
a
service
rails
app
a
service

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@ph1
SELECTION OF DEALS
ARRAY OF ENTICING
PRODUCT CATEGORIES

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@ph1
rails
app
product
service
deals
service

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@ph1
rails
app

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@ph1
rails
app
product
service
deals
service
RED
TEAM
GREEN
TEAM
BLUE
TEAM

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@ph1
CONWAY’S
LAW

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@ph1
SYSTEM
ARCHITECTURE
HOW PEOPLE
WORK TOGETHER
AFFECTS

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@ph1
HOW PEOPLE
WORK TOGETHER
AFFECTS
SYSTEM
ARCHITECTURE

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@ph1
rails
app
product
service
deals
service
RED
TEAM
GREEN
TEAM
BLUE
TEAM

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@ph1
WHO’S BUG
IS IT
ANYWAY?

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@ph1
rails
app
deals
service
product
service

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@ph1
fake
service
fake
service
rails
BOUNDED
INTEGRATION 
TESTS
rails
app

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@ph1
IN PROCESS OUT-OF-PROCESS
vcr
webmock
mimic
moco
stubby
montebank

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@ph1
deals
service
product
service
rails
product
service
deals
service
✓
? ?
rails
app

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@ph1
CONTRACT
TESTS

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@ph1
rails
app
product
service
deals
service

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@ph1
product
service
deals
service
rails
app

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@ph1
(or minitest, or whatever)
plain old rspec
pacto
pact

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END-TO-END
TESTS
UNIT
TESTS
BOUNDED
INTEGRATION TESTS
SERVICE A
CONTRACT TESTS
SERVICE B
CONTRACT TESTS
SERVICE D
CONTRACT TESTS
SERVICE C
CONTRACT TESTS
FUNCTIONAL
TESTS

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@ph1
ACT TWO
SERVICE
GATEWAYS

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@ph1
faraday

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@ph1
rack

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CACHING
AUTHENTICATION
HTTP SERVER
COOKIES
LOGGING
rack

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@ph1
use Rack::Sendfile
use ActionDispatch::Static
use Rack::Lock
use #
use Rack::Runtime
use Rack::MethodOverride
use ActionDispatch::RequestId
use Rails::Rack::Logger
use ActionDispatch::ShowExceptions
use ActionDispatch::DebugExceptions
use ActionDispatch::RemoteIp
use ActionDispatch::Reloader
use ActionDispatch::Callbacks
use ActiveRecord::Migration::CheckPending
use ActiveRecord::ConnectionAdapters::ConnectionManagement
use ActiveRecord::QueryCache
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
use ActionDispatch::ParamsParser
use Rack::Head
use Rack::ConditionalGet
use Rack::ETag
run MyApp::Application.routes

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@ph1
CACHING
AUTHENTICATION
HTTP CLIENT
SERIALIZATION
faraday

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@ph1
class BikeStationGateway
STATIONS_PATH = '/stations/json'
!
def initialize( base_url = 'http://bayareabikeshare.com' )
@conn = Faraday.new(:url => base_url ) do |faraday|
faraday.use :instrumentation
faraday.response :json
faraday.request :encode_json
faraday.response :follow_redirects
faraday.response :logger
faraday.adapter Faraday.default_adapter
end
end
!
def stations
response = @conn.get(STATIONS_PATH)
# ... parse response.body into a list of stations
end
end

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@ph1
a
service
a
service
service gateways

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@ph1
hexagonal  
architecture

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@ph1
CACHING
AUTHENTICATION
HTTP CLIENT
SERIALIZATION

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@ph1
{
“JSON”: “parsing”
}
!

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@ph1
{
"meta": {
"response-time": "141",
"server": "http://foo.com",
...
},
"product": {
"uid": "151231511315083",
"summary": {
"title": "A Book Of Things",
"shortDescription": “.....",
...
},
"author": {
"firstName": "Bob",
"lastName": "Smith",
...
},
...
}
}

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@ph1
hashie
lazy_doc
embedded_doc
representable

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@ph1
CACHING
AUTHENTICATION
HTTP CLIENT
SERIALIZATION

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@ph1
rails
app
product
service
pricing
service

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@ph1
cache the crap
out of this!
/prod-images/15123_front.png

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@ph1
cache the crap
out of this too!
/products/15123.json

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@ph1
CACHING
AUTHENTICATION
HTTP CLIENT
SERIALIZATION

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@ph1
class BikeStationGateway
STATIONS_PATH = '/stations/json'
!
def initialize( base_url = 'http://bayareabikeshare.com' )
@conn = Faraday.new(:url => base_url ) do |faraday|
faraday.use :instrumentation
faraday.response :json
faraday.request :encode_json
faraday.response :follow_redirects
faraday.response :logger
!
faraday.use
FaradayMiddleware::RackCompatible,
Rack::Cache::Context,
:metastore => "file:#{cache_dir}/faraday/meta",
:entitystore => “file:#{cache_dir}/faraday/body",
:ignore_headers => %w[Set-Cookie X-Content-Digest]
!
!
faraday.adapter Faraday.default_adapter
end
end
end

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Railsconf2014

Railsconf2014

Pete Hodgson

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