Railsconf2014

Rails as an SOA client - Railsconf 2014

Transcript

1. RAILS AS 

   AN SOA CLIENT
   Pete Hodgson | @ph1 | phodgson@thoughtworks.com
   

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2. @ph1
   rails
   DB
   DB
   rails
   app
   

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3. @ph1
   rails
   a
   service
   a
   service
   DB
   DB
   rails
   app
   

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4. @ph1
   rails
   a
   service
   a
   service a
   service
   a
   service
   DB
   DB
   rails
   app
   

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5. @ph1
   rails
   a
   service
   a
   service a
   service
   a
   service
   rails
   app
   

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

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7. @ph1
   ACT ONE
   INDEPENDENCE
   CO-DEPENDENCE
   and
   

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8. @ph1
   a
   service
   rails
   app
   a
   service
   

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9. @ph1
   SELECTION OF DEALS
   ARRAY OF ENTICING
   PRODUCT CATEGORIES
   

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10. @ph1
    rails
    app
    product
    service
    deals
    service
    

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11. @ph1
    rails
    app
    

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

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13. @ph1
    CONWAY’S
    LAW
    

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14. @ph1
    SYSTEM
    ARCHITECTURE
    HOW PEOPLE
    WORK TOGETHER
    AFFECTS
    

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15. @ph1
    HOW PEOPLE
    WORK TOGETHER
    AFFECTS
    SYSTEM
    ARCHITECTURE
    

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

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17. @ph1
    WHO’S BUG
    IS IT
    ANYWAY?
    

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18. @ph1
    rails
    app
    deals
    service
    product
    service
    

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19. @ph1
    fake
    service
    fake
    service
    rails
    BOUNDED
    INTEGRATION

    TESTS
    rails
    app
    

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

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

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22. @ph1
    CONTRACT
    TESTS
    

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23. @ph1
    rails
    app
    product
    service
    deals
    service
    

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24. @ph1
    product
    service
    deals
    service
    rails
    app
    

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

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26. 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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27. 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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28. @ph1
    ACT TWO
    SERVICE
    GATEWAYS
    

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29. @ph1
    faraday
    

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30. @ph1
    rack
    

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31. CACHING
    AUTHENTICATION
    HTTP SERVER
    COOKIES
    LOGGING
    rack
    

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32. @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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33. @ph1
    CACHING
    AUTHENTICATION
    HTTP CLIENT
    SERIALIZATION
    faraday
    

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34. @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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35. @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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36. @ph1
    a
    service
    a
    service
    service gateways
    

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37. @ph1
    hexagonal 

    architecture
    

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38. @ph1
    CACHING
    AUTHENTICATION
    HTTP CLIENT
    SERIALIZATION
    

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39. @ph1
    {
    “JSON”: “parsing”
    }
    !
    
    
    
    

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40. @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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41. @ph1
    hashie
    lazy_doc
    embedded_doc
    representable
    

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42. @ph1
    CACHING
    AUTHENTICATION
    HTTP CLIENT
    SERIALIZATION
    

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43. @ph1
    rails
    app
    product
    service
    pricing
    service
    

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

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

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46. @ph1
    CACHING
    AUTHENTICATION
    HTTP CLIENT
    SERIALIZATION
    

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47. @ph1
    CACHING
    AUTHENTICATION
    HTTP CLIENT
    SERIALIZATION
    

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48. @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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49. @ph1
    on the web

    OF the web
    

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50. @ph1
    EPILOGUE
    SOME

    PRINCIPLES
    

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51. @ph1
    CONWAY’S
    LAW
    

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52. @ph1
    DOMAIN
    DRIVEN
    DESIGN
    

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53. @ph1
    POSTEL’S
    LAW
    

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54. @ph1
    HEXAGONAL
    ARCHITECTURE
    

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55. @ph1
    EMBRACE

    THE WEB
    

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56. THANKS!
    Pete Hodgson
    @ph1

    phodgson@thoughtworks.com
    

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57. 57
    SLIDES =>
    Pete Hodgson
    @ph1

    phodgson@thoughtworks.com
    

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