Module: Datadog::Contrib::ActiveSupport::Cache::Instrumentation

Defined in:
lib/ddtrace/contrib/active_support/cache/instrumentation.rb

Overview

Defines instrumentation for ActiveSupport caching rubocop:disable Lint/RescueException

Defined Under Namespace

Modules: Delete, Fetch, Read, Write

Class Method Summary collapse

Class Method Details

.finish_trace_cache(payload) ⇒ Object 



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# File 'lib/ddtrace/contrib/active_support/cache/instrumentation.rb', line 37

def finish_trace_cache(payload)
  # retrieve the tracing context and continue the trace
  tracing_context = payload.fetch(:tracing_context)
  span = tracing_context[:dd_cache_span]
  return unless span && !span.finished?

  begin
    # discard parameters from the cache_store configuration
    if defined?(::Rails)
      store, = *Array.wrap(::Rails.configuration.cache_store).flatten
      span.set_tag(Ext::TAG_CACHE_BACKEND, store)
    end

    normalized_key = ::ActiveSupport::Cache.expand_cache_key(payload.fetch(:key))
    cache_key = Datadog::Utils.truncate(normalized_key, Ext::QUANTIZE_CACHE_MAX_KEY_SIZE)
    span.set_tag(Ext::TAG_CACHE_KEY, cache_key)

    span.set_error(payload[:exception]) if payload[:exception]
  ensure
    span.finish
  end
rescue StandardError => e
  Datadog::Tracer.log.debug(e.message)
end

.start_trace_cache(payload) ⇒ Object 



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# File 'lib/ddtrace/contrib/active_support/cache/instrumentation.rb', line 12

def start_trace_cache(payload)
  tracer = Datadog.configuration[:active_support][:tracer]

  # In most of the cases Rails ``fetch()`` and ``read()`` calls are nested.
  # This check ensures that two reads are not nested since they don't provide
  # interesting details.
  # NOTE: the ``finish_trace_cache()`` is fired but it already has a safe-guard
  # to avoid any kind of issue.
  current_span = tracer.active_span
  return if payload[:action] == Ext::RESOURCE_CACHE_GET &&
            current_span.try(:name) == Ext::SPAN_CACHE &&
            current_span.try(:resource) == Ext::RESOURCE_CACHE_GET

  tracing_context = payload.fetch(:tracing_context)

  # create a new ``Span`` and add it to the tracing context
  service = Datadog.configuration[:active_support][:cache_service]
  type = Ext::SPAN_TYPE_CACHE
  span = tracer.trace(Ext::SPAN_CACHE, service: service, span_type: type)
  span.resource = payload.fetch(:action)
  tracing_context[:dd_cache_span] = span
rescue StandardError => e
  Datadog::Tracer.log.debug(e.message)
end