Class: Griffin::Interceptors::Server::ScoutApmInterceptor

Inherits:
GRPC::ServerInterceptor
  • Object
show all
Defined in:
lib/griffin/interceptors/server/scout_apm_interceptor.rb

Constant Summary collapse

LAYER_TYPE =

Specify the controller layer so that the transaction gets categorized as a web transaction.

'Controller'

Instance Method Summary collapse

Constructor Details

#initialize(ignored_services: [], sampling_rate: 1.0) ⇒ ScoutApmInterceptor

Returns a new instance of ScoutApmInterceptor.



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# File 'lib/griffin/interceptors/server/scout_apm_interceptor.rb', line 15

def initialize(ignored_services: [], sampling_rate: 1.0)
  @ignored_services = ignored_services.map(&:service_name)
  @sampling_rate = sampling_rate.to_f
end

Instance Method Details

#request_response(request: nil, call: nil, method: nil) ⇒ Object 



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# File 'lib/griffin/interceptors/server/scout_apm_interceptor.rb', line 20

def request_response(request: nil, call: nil, method: nil)
  service_name = call.service_name
  method_name = method.name

  return yield if rand > @sampling_rate || @ignored_services.include?(service_name)

  layer = ScoutApm::Layer.new(LAYER_TYPE, "#{service_name}/#{method_name}")

  req = ScoutApm::RequestManager.lookup
  req.start_layer(layer)
  req.annotate_request(uri: "/#{service_name}/#{method_name}")

  ScoutApm::Context.add(
    request_id: call.metadata['x-request-id'],
    user_agent: call.metadata['user-agent'],
  )

  begin
    yield
  rescue => e
    req.error!
    raise e
  ensure
    req.stop_layer
  end
end