Class: Routemaster::Middleware::Siphon

Inherits:
Object
  • Object
show all
Defined in:
lib/routemaster/middleware/siphon.rb

Overview

Filters out events based on their topic and passes them to a handling class

use Middleware::Siphon, 'siphon_events' => {'some_topic' => SomeTopicHandler}

Topic handlers are initialized with the full event payload and must respond to #call

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Siphon

Returns a new instance of Siphon.



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# File 'lib/routemaster/middleware/siphon.rb', line 9

def initialize(app, options = {})
  @app = app
  @processors = options.fetch(:siphon_events) { {} }
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/routemaster/middleware/siphon.rb', line 14

def call(env)
  siphoned, non_siphoned = env.fetch('routemaster.payload', []).partition do |event|
    topics_to_siphon.include? event['topic']
  end
  siphoned.each do |event|
    @processors[event['topic']].new(event).call
  end
  env['routemaster.payload'] = non_siphoned
  @app.call(env)
end