Glint

Transcript

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

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   @kentaro Software engineer to build technical basis Rubyist / Perl

   Monger Kentaro Kuribayashi paperboy&co.
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   None
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   Problem

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   Applications often consists of various components

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   • Cache servers • Storage servers • Job queue/workers •

   Other applications (e.g. external APIs) • etc.
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   • 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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   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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   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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    Solution

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    Glint

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    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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    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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    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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    Basic usage

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    With RSpec

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    servers/memcached.rb

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    spec_helper.rb

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    **_spec.rb

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    App + External App

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    initializer/**.rb

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    **_spec.rb

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    TCP server + TCP server

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    Fluentd::Integration

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    How Glint Cleans up the Servers

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    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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    glint/server.rb Glint::Server#stop

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    • Stubbing out external connection may cause some problems •

    Glint allows you to easily fire up TCP servers as you need • Patches are welcome! Recap