Class: Hiera::Backend::Eyaml_backend

Inherits:
Object
  • Object
show all
Defined in:
lib/hiera/backend/eyaml_backend.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cache = nil) ⇒ Eyaml_backend

Returns a new instance of Eyaml_backend.



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# File 'lib/hiera/backend/eyaml_backend.rb', line 15

def initialize(cache = nil)
  debug("Hiera eYAML backend starting")

  @cache     = cache || Filecache.new
  @extension = Config[:eyaml][:extension] || "eyaml"
end

Instance Attribute Details

#extension ⇒ Object (readonly)

Returns the value of attribute extension.



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# File 'lib/hiera/backend/eyaml_backend.rb', line 13

def extension
  @extension
end

Instance Method Details

#lookup(key, scope, order_override, resolution_type) ⇒ Object 



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# File 'lib/hiera/backend/eyaml_backend.rb', line 22

def lookup(key, scope, order_override, resolution_type)
  answer = nil

  parse_options(scope)

  debug("Looking up #{key} in eYAML backend")

  Backend.datasources(scope, order_override) do |source|
    debug("Looking for data source #{source}")
    eyaml_file = Backend.datafile(:eyaml, scope, source, extension) || next

    next unless File.exists?(eyaml_file)

    data = @cache.read(eyaml_file, Hash) do |data|
      YAML.load(data) || {}
    end

    next if data.empty?
    next unless data.include?(key)

    # Extra logging that we found the key. This can be outputted
    # multiple times if the resolution type is array or hash but that
    # should be expected as the logging will then tell the user ALL the
    # places where the key is found.
    debug("Found #{key} in #{source}")

    # for array resolution we just append to the array whatever
    # we find, we then goes onto the next file and keep adding to
    # the array
    #
    # for priority searches we break after the first found data item
    new_answer = parse_answer(data[key], scope)
    case resolution_type
    when :array
      raise Exception, "Hiera type mismatch: expected Array and got #{new_answer.class}" unless new_answer.kind_of? Array or new_answer.kind_of? String
      answer ||= []
      answer << new_answer
    when :hash
      raise Exception, "Hiera type mismatch: expected Hash and got #{new_answer.class}" unless new_answer.kind_of? Hash
      answer ||= {}
      answer = Backend.merge_answer(new_answer,answer)
    else
      answer = new_answer
      break
    end
  end

  return answer
end