Class: Rack::Instrumentation

Inherits:
Object
  • Object
show all
Includes:
Metrics::MiddlewareHelpers
Defined in:
lib/rack/instrumentation.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Instrumentation

Returns a new instance of Instrumentation.



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# File 'lib/rack/instrumentation.rb', line 7

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/instrumentation.rb', line 11

def call(env)
  begin
    header_metrics env

    time     = Time.now
    response = @app.call(env)
    duration = (Time.now - time) * 1000.0

    request_metrics response.first, duration, metric: 'rack.request'

    response
  rescue Exception => raised
    instrument 'rack.exception', 1, type: 'count'
    raise
  end
end