Phoenix-like `pipeline` plugin for Roda

[Василий Колесников]

Hi Jeremy and all!

What do you think about the subject? Would it be useful to have such plugin?

https://gist.github.com/v-kolesnikov/7138713dcd46c40f2a43c2843414c0d4

[Jeremy Evans]

Basically, this is a separate middleware stack executed at arbitrary points during routing. Except that it doesn't operate as a middleware stack.  Consider a middleware such as:

class M2
  def initialize(app)
    @app = app
  end

  def call(env)
    @app.call(env.merge('baz'=>'quuz'))
  end
end

This change to `env` is lost.  Also consider a change where you are using a middleware that modifies the response:

class M2
  def initialize(app)
    @app = app
  end

  def call(env)
    res = @app.call(env)
    def (res[2]).each
      super{|s| yield s.upcase}
    end
    res
  end
end

This pipeline plugin doesn't do what is expected with this middleware.

If you actually want something like this in Roda, you need separate rack applications for the branches which need separate middleware stacks.  Those rack applications can also be Roda applications.  You can then use r.run to dispatch to these apps:

class API < Roda
  use M1

  route do |r|
    'foo'
  end
end

class Web < Roda
  use M1
  use M2

  route do |r|
     'bar'
  end
end

class App < Roda
  route do |r|
    r.root do
      'root'
    end

    r.on('foo') do
      r.run API
    end

    r.on('bar') do
      r.run Web
    end
  end
end

If you have many similar blocks like this using r.run, you may want to look into the multi_run plugin.

Thanks,

Jeremy

[Vasily Kolesnikov]

Now, I see the problems. Thanks!

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С уважением

Василий Колесников