Module: SignalFx::Tracing::Instrumenter::Faraday

Defined in:
lib/signalfx/tracing/instrumentation/faraday.rb

Class Method Summary collapse

Class Method Details

.instrument(opts = {}) ⇒ Object 



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# File 'lib/signalfx/tracing/instrumentation/faraday.rb', line 10

def instrument(opts = {})
  begin
    require 'faraday'
  rescue LoadError
    return
  end

  begin
    require 'faraday/tracer'
  rescue LoadError => e
    puts e.message
    return
  end

  patch_initialize if !@instrumented
  @instrumented = true
end

.patch_initialize ⇒ Object

somewhat messy, but this lets connections be traced without manual configuration to use the middleware



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# File 'lib/signalfx/tracing/instrumentation/faraday.rb', line 30

def patch_initialize
  ::Faraday::Connection.module_eval do
    alias_method :initialize_original, :initialize

    def initialize(url = nil, options = nil, &block)
      # initialize the connection as usual
      initialize_original(url, options, &block)

      # before we let go, add the Faraday tracer to the beginning of the stack
      @builder.insert(0, ::Faraday::Tracer)
    end
  end
end