Module: Datadog::Tracing::Contrib::Grape::Endpoint

Defined in:
lib/datadog/tracing/contrib/grape/endpoint.rb

Overview

Endpoint module includes a list of subscribers to create traces when a Grape endpoint is hit

Constant Summary collapse

KEY_RUN = 
'datadog_grape_endpoint_run'
KEY_RENDER = 
'datadog_grape_endpoint_render'

Class Method Summary collapse

Class Method Details

.endpoint_render(name, start, finish, id, payload) ⇒ Object 



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 172

def endpoint_render(name, start, finish, id, payload)
  return unless Thread.current[KEY_RENDER]

  Thread.current[KEY_RENDER] = false

  return unless enabled?

  span = Tracing.active_span
  return unless span

  # catch thrown exceptions
  begin
    # Measure service stats
    Contrib::Analytics.set_measured(span)

    handle_error(span, payload[:exception_object]) if payload[:exception_object]
  ensure
    span.start(start)
    span.finish(finish)
  end
rescue StandardError => e
  Datadog.logger.error(e.message)
  Datadog::Core::Telemetry::Logger.report(e)
end

.endpoint_run(name, start, finish, id, payload) ⇒ Object 



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 84

def endpoint_run(name, start, finish, id, payload)
  return unless Thread.current[KEY_RUN]

  Thread.current[KEY_RUN] = false

  return unless enabled?

  trace = Tracing.active_trace
  span = Tracing.active_span
  return unless trace && span

  begin
    # collect endpoint details
    endpoint = payload.fetch(:endpoint)
    api_view = api_view(endpoint.options[:for])
    request_method = endpoint.options.fetch(:method).first
    path = endpoint_expand_path(endpoint)

    trace.resource = span.resource

    # Set analytics sample rate
    Contrib::Analytics.set_sample_rate(span, analytics_sample_rate) if analytics_enabled?

    # Measure service stats
    Contrib::Analytics.set_measured(span)

    handle_error_and_status_code(span, endpoint, payload)

    # override the current span with this notification values
    span.set_tag(Ext::TAG_ROUTE_ENDPOINT, api_view) unless api_view.nil?
    span.set_tag(Ext::TAG_ROUTE_PATH, path)
    span.set_tag(Ext::TAG_ROUTE_METHOD, request_method)

    span.set_tag(Tracing::Metadata::Ext::HTTP::TAG_METHOD, request_method)
    span.set_tag(Tracing::Metadata::Ext::HTTP::TAG_URL, path)
  ensure
    span.start(start)
    span.finish(finish)
  end
rescue StandardError => e
  Datadog.logger.error(e.message)
  Datadog::Core::Telemetry::Logger.report(e)
end

.endpoint_run_filters(name, start, finish, id, payload) ⇒ Object 



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 197

def endpoint_run_filters(name, start, finish, id, payload)
  return unless enabled?

  # safe-guard to prevent submitting empty filters
  zero_length = (finish - start).zero?
  filters = payload[:filters]
  type = payload[:type]
  return if (!filters || filters.empty?) || !type || zero_length

  span = Tracing.trace(
    Ext::SPAN_ENDPOINT_RUN_FILTERS,
    service: service_name,
    type: Tracing::Metadata::Ext::HTTP::TYPE_INBOUND,
    start_time: start
  )

  begin
    span.set_tag(Tracing::Metadata::Ext::TAG_COMPONENT, Ext::TAG_COMPONENT)
    span.set_tag(Tracing::Metadata::Ext::TAG_OPERATION, Ext::TAG_OPERATION_ENDPOINT_RUN_FILTERS)

    # Set analytics sample rate
    Contrib::Analytics.set_sample_rate(span, analytics_sample_rate) if analytics_enabled?

    # Measure service stats
    Contrib::Analytics.set_measured(span)

    # catch thrown exceptions
    handle_error(span, payload[:exception_object]) if payload[:exception_object]

    span.set_tag(Ext::TAG_FILTER_TYPE, type.to_s)
  ensure
    span.start(start)
    span.finish(finish)
  end
rescue StandardError => e
  Datadog.logger.error(e.message)
  Datadog::Core::Telemetry::Logger.report(e)
end

.endpoint_start_process(_name, _start, _finish, _id, payload) ⇒ Object 



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 39

def endpoint_start_process(_name, _start, _finish, _id, payload)
  return if Thread.current[KEY_RUN]
  return unless enabled?

  # collect endpoint details
  endpoint = payload.fetch(:endpoint)
  env = payload.fetch(:env)
  api_view = api_view(endpoint.options[:for])
  request_method = endpoint.options.fetch(:method).first
  path = endpoint_expand_path(endpoint)
  resource = "#{api_view} #{request_method} #{path}"

  # Store the beginning of a trace
  span = Tracing.trace(
    Ext::SPAN_ENDPOINT_RUN,
    service: service_name,
    type: Tracing::Metadata::Ext::HTTP::TYPE_INBOUND,
    resource: resource
  )
  trace = Tracing.active_trace

  # Set the trace resource
  trace.resource = span.resource

  span.set_tag(Tracing::Metadata::Ext::TAG_COMPONENT, Ext::TAG_COMPONENT)
  span.set_tag(Tracing::Metadata::Ext::TAG_OPERATION, Ext::TAG_OPERATION_ENDPOINT_RUN)

  if (grape_route = env['grape.routing_args']) && grape_route[:route_info]
    trace.set_tag(
      Tracing::Metadata::Ext::HTTP::TAG_ROUTE,
      # here we are removing the format from the path:
      # e.g. /path/to/resource(.json) => /path/to/resource
      # e.g. /path/to/resource(.:format) => /path/to/resource
      grape_route[:route_info].path&.gsub(/\(\.:?\w+\)\z/, '')
    )

    trace.set_tag(Tracing::Metadata::Ext::HTTP::TAG_ROUTE_PATH, env['SCRIPT_NAME'])
  end

  Thread.current[KEY_RUN] = true
rescue StandardError => e
  Datadog.logger.error(e.message)
  Datadog::Core::Telemetry::Logger.report(e)
end

.endpoint_start_render ⇒ Object 



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 152

def endpoint_start_render(*)
  return if Thread.current[KEY_RENDER]
  return unless enabled?

  # Store the beginning of a trace
  span = Tracing.trace(
    Ext::SPAN_ENDPOINT_RENDER,
    service: service_name,
    type: Tracing::Metadata::Ext::HTTP::TYPE_TEMPLATE
  )

  span.set_tag(Tracing::Metadata::Ext::TAG_COMPONENT, Ext::TAG_COMPONENT)
  span.set_tag(Tracing::Metadata::Ext::TAG_OPERATION, Ext::TAG_OPERATION_ENDPOINT_RENDER)

  Thread.current[KEY_RENDER] = true
rescue StandardError => e
  Datadog.logger.error(e.message)
  Datadog::Core::Telemetry::Logger.report(e)
end

.handle_error_and_status_code(span, endpoint, payload) ⇒ Object

Status code resolution is tied to the exception handling



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 129

def handle_error_and_status_code(span, endpoint, payload)
  status = nil

  # Handle exceptions and status code
  if (exception_object = payload[:exception_object])
    # If the exception is not an internal Grape error, we won't have a status code at this point.
    status = exception_object.status if exception_object.respond_to?(:status)

    handle_error(span, exception_object, status)
  else
    # Status code is unreliable in `endpoint_run.grape` if there was an exception.
    # Only after `Grape::Middleware::Error#run_rescue_handler` that the error status code of a request with a
    # Ruby exception error is resolved. But that handler is called further down the Grape middleware stack.
    # Rack span will then be the most reliable source for status codes.
    # DEV: As a corollary, instrumenting Grape without Rack will provide incomplete
    # DEV: status quote information.
    status = endpoint.status
    span.set_error(endpoint) if error_status_codes.include?(status)
  end

  span.set_tag(Tracing::Metadata::Ext::HTTP::TAG_STATUS_CODE, status) if status
end

.subscribe ⇒ Object 



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# File 'lib/datadog/tracing/contrib/grape/endpoint.rb', line 20

def subscribe
  # subscribe when a Grape endpoint is hit
  ::ActiveSupport::Notifications.subscribe('endpoint_run.grape.start_process') do |*args|
    endpoint_start_process(*args)
  end
  ::ActiveSupport::Notifications.subscribe('endpoint_run.grape') do |*args|
    endpoint_run(*args)
  end
  ::ActiveSupport::Notifications.subscribe('endpoint_render.grape.start_render') do |*args|
    endpoint_start_render(*args)
  end
  ::ActiveSupport::Notifications.subscribe('endpoint_render.grape') do |*args|
    endpoint_render(*args)
  end
  ::ActiveSupport::Notifications.subscribe('endpoint_run_filters.grape') do |*args|
    endpoint_run_filters(*args)
  end
end