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Versions: 7
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Contents
# frozen_string_literal: true
# Copyright 2020 OpenTelemetry Authors
#
# SPDX-License-Identifier: Apache-2.0
require 'opentelemetry'
module OpenTelemetry
module Instrumentation
module Rack
# The Instrumentation class contains logic to detect and install the Rack
# instrumentation
class Instrumentation < OpenTelemetry::Instrumentation::Base
install do |config|
require_dependencies
retain_middleware_names if config[:retain_middleware_names]
end
present do
defined?(::Rack)
end
private
def require_dependencies
require_relative 'middlewares/tracer_middleware'
end
MissingApplicationError = Class.new(StandardError)
# intercept all middleware-compatible calls, retain class name
def retain_middleware_names
next_middleware = config[:application]
raise MissingApplicationError unless next_middleware
while next_middleware
if next_middleware.respond_to?(:call)
next_middleware.singleton_class.class_eval do
alias_method :__call, :call
def call(env)
env['RESPONSE_MIDDLEWARE'] = self.class.to_s
__call(env)
end
end
end
next_middleware = next_middleware.instance_variable_defined?('@app') &&
next_middleware.instance_variable_get('@app')
end
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems