Module: MetrixWire::Instrument::RackBuilder

Defined in:
lib/metrixwire/instrument/rack_builder.rb

Overview

Auto-inserts Rack into any Rack app that isn't Rails, by patching Rack::Builder#to_app to wrap the built app once. This is what makes Sinatra / bare Rack "zero-wiring": the user never adds use.

Rails is handled by the Railtie instead (this patch skips when Rails is defined so we don't double-wrap).

Defined Under Namespace

Modules: Patch

Class Method Summary collapse

Class Method Details

.install ⇒ Object 



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# File 'lib/metrixwire/instrument/rack_builder.rb', line 14

def install
  return unless defined?(::Rack::Builder)
  return if ::Rack::Builder.instance_variable_get(:@__metrixwire_patched)

  ::Rack::Builder.prepend(Patch)
  ::Rack::Builder.instance_variable_set(:@__metrixwire_patched, true)
rescue StandardError
  nil
end