Module: Datadog::Contrib::Redis::Patcher

Includes:
Patcher
Defined in:
lib/ddtrace/contrib/redis/patcher.rb

Overview

Patcher enables patching of ‘redis’ module.

Class Method Summary collapse

Methods included from Patcher

included

Class Method Details

.patch ⇒ Object

patch applies our patch if needed



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# File 'lib/ddtrace/contrib/redis/patcher.rb', line 19

def patch
  # do not require these by default, but only when actually patching
  require 'redis'
  require 'ddtrace/ext/app_types'
  require 'ddtrace/contrib/redis/tags'
  require 'ddtrace/contrib/redis/quantize'

  patch_redis_client
end

.patch_redis_client ⇒ Object

rubocop:disable Metrics/MethodLength rubocop:disable Metrics/BlockLength



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# File 'lib/ddtrace/contrib/redis/patcher.rb', line 31

def patch_redis_client
  ::Redis::Client.class_eval do
    alias_method :call_without_datadog, :call
    remove_method :call
    def call(*args, &block)
      pin = Datadog::Pin.get_from(self)
      return call_without_datadog(*args, &block) unless pin && pin.tracer

      response = nil
      pin.tracer.trace(Datadog::Contrib::Redis::Ext::SPAN_COMMAND) do |span|
        span.service = pin.service
        span.span_type = Datadog::Contrib::Redis::Ext::TYPE
        span.resource = Datadog::Contrib::Redis::Quantize.format_command_args(*args)
        Datadog::Contrib::Redis::Tags.set_common_tags(self, span)

        response = call_without_datadog(*args, &block)
      end

      response
    end

    alias_method :call_pipeline_without_datadog, :call_pipeline
    remove_method :call_pipeline
    def call_pipeline(*args, &block)
      pin = Datadog::Pin.get_from(self)
      return call_pipeline_without_datadog(*args, &block) unless pin && pin.tracer

      response = nil
      pin.tracer.trace(Datadog::Contrib::Redis::Ext::SPAN_COMMAND) do |span|
        span.service = pin.service
        span.span_type = Datadog::Contrib::Redis::Ext::TYPE
        commands = args[0].commands.map { |c| Datadog::Contrib::Redis::Quantize.format_command_args(c) }
        span.resource = commands.join("\n")
        Datadog::Contrib::Redis::Tags.set_common_tags(self, span)
        span.set_metric Datadog::Contrib::Redis::Ext::METRIC_PIPELINE_LEN, commands.length

        response = call_pipeline_without_datadog(*args, &block)
      end

      response
    end

    def datadog_pin
      @datadog_pin ||= begin
        pin = Datadog::Pin.new(
          datadog_configuration[:service_name],
          app: Ext::APP,
          app_type: Datadog::Ext::AppTypes::DB,
          tracer: datadog_configuration[:tracer]
        )
        pin.onto(self)
      end
    end

    private

    def datadog_configuration
      Datadog.configuration[:redis, options]
    end
  end
end

.target_version ⇒ Object 



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# File 'lib/ddtrace/contrib/redis/patcher.rb', line 14

def target_version
  Integration.version
end