Class: ThreeThings::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/three-things/middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, statsd, prefix = "") ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/three-things/middleware.rb', line 3

def initialize(app, statsd, prefix = "")
  @app = app
  @statsd = statsd

  # This is actually better dealt with using Statsd.tap, but it all depends
  # on your statsd implementation.
  @prefix = prefix
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/three-things/middleware.rb', line 20

def call(env)
  req = Rack::Request.new(env)

  # Request count
  @statsd.increment path("request.count"), tags: ["path:#{req.path}"]

  # Reqest time
  status, headers, body = @statsd.time path("request.time"), tags: ["path:#{req.path}"] do
    @app.call env
  end

  # Request errors
  if status > 308
    @statsd.increment path("request.error"), tags: ["status_code:#{status}", "path:#{req.path}"]
  end

  [status, headers, body]
end

#path(postfix) ⇒ Object 



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# File 'lib/three-things/middleware.rb', line 12

def path(postfix)
  if @prefix != ""
    "#{@prefix}.#{postfix}"
  else
    postfix
  end
end