Class: NewRelic::Agent::ServerlessHandlerEventSources

Inherits:
Object
  • Object
show all
Defined in:
lib/new_relic/agent/serverless_handler_event_sources.rb

Overview

ServerlessHandlerEventSources - New Relic’s language agent devs maintain a cross-agent JSON map of all AWS resources with the potential to invoke an AWS Lambda function by issuing it an event. This map is used to glean source specific attributes while instrumenting the function’s invocation.

Given that the event arrives as a Ruby hash argument to the AWS Lambda function, the JSON map’s values need to be converted into arrays that can be passed to ‘Hash#dig`. So a value such as `’records.name’‘ needs to be converted to `[’records’, 0, ‘name’]‘. This class’s ‘.to_hash` method yields the converted data.

Furthermore, ‘.length` calls are converted to Ruby `#size` notation to denote that a method call must be performed on the dug value.

Constant Summary collapse

JSON_SOURCE = 
File.join(File.dirname(__FILE__), 'serverless_handler_event_sources.json').freeze
JSON_RAW = 
JSON.parse(File.read(JSON_SOURCE)).freeze

Class Method Summary collapse

Class Method Details

.to_hash ⇒ Object 



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# File 'lib/new_relic/agent/serverless_handler_event_sources.rb', line 26

def self.to_hash
  JSON_RAW.each_with_object({}) do |(type, info), hash|
    hash[type] = {'attributes' => {},
                  'name' => info['name'],
                  'required_keys' => []}
    info['attributes'].each { |attr, value| hash[type]['attributes'][attr] = transform(value) }
    info['required_keys'].each { |key| hash[type]['required_keys'].push(transform(key)) }
  end.freeze
end

.transform(value) ⇒ Object 



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# File 'lib/new_relic/agent/serverless_handler_event_sources.rb', line 36

def self.transform(value)
  value.gsub(/\[(\d+)\]/, '.\1').split('.').map do |e|
    if e.match?(/^\d+$/)
      e.to_i
    elsif e == 'length'
      '#size'
    else
      e
    end
  end
end