Glint

RedDotRubyConf 2013
http://www.reddotrubyconf.com/

Transcript

1. Glint
   Fires arbitrary TCP servers
   http://www.flickr.com/photos/tjblackwell/3107540997/
   

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2. @kentaro
   Software engineer to
   build technical basis
   Rubyist / Perl Monger
   Kentaro Kuribayashi
   paperboy&co.
   

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4. Problem
   

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5. Applications often consists
   of various components
   

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6. • Cache servers
   • Storage servers
   • Job queue/workers
   • Other applications
   (e.g. external APIs)
   • etc.
   

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7. • Launch servers in advance
   (e.g mysql/pg with Rails)
   • Stub out connections to
   the servers
   (e.g. stub/mock in RSpec)
   To deal with it, you may:
   

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8. Launching Servers
   • We don’t always need
   such many servers
   • It can be waste of limited
   resources of our daily-
   used local machine
   

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9. Stubbing out Connections
   • Efficient way to test apps that
   depends on external
   components
   • But we can’t tell whether or
   not our apps work well indeed
   against real servers
   

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10. Solution
    

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11. Glint
    

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12. Glint is a library which allows
    you to fire arbitrary TCP
    servers to help you test your
    codes against those real
    servers without stubbing
    out.
    

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13. 1. Fork a child process for a
    TCP server
    2. Find an empty port for the
    server
    3. Exec the server program
    using the port
    4. Destroy the child process
    when it’s no longer needed
    

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14. 1. Fork a child process for a
    TCP server
    2. Find an empty port for the
    server
    3. Exec the server program
    using the port
    4. Destroy the child process
    when it’s no longer needed
    

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15. Basic usage
    

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16. With RSpec
    

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17. servers/memcached.rb
    

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18. spec_helper.rb
    

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19. **_spec.rb
    

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20. App + External App
    

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21. initializer/**.rb
    

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22. **_spec.rb
    

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23. TCP server
    +
    TCP server
    

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24. Fluentd::Integration
    

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25. How Glint Cleans up
    the Servers
    

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26. http://ruby-doc.org/core-2.0/ObjectSpace.html
    “ObjectSpace also provides support
    for object finalizers, procs that will
    be called when a specific object is
    about to be destroyed by garbage
    collection.”
    

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27. glint/server.rb
    Glint::Server#stop
    

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28. • Stubbing out external
    connection may cause
    some problems
    • Glint allows you to easily
    fire up TCP servers as you
    need
    • Patches are welcome!
    Recap
    

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