Class: Hiera::Backend::Yamll_backend

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

Constant Summary collapse

VERSION = 
"0.3.1"

Instance Method Summary collapse

Constructor Details

#initialize(cache = nil) ⇒ Yamll_backend

This is left blank because we are hacking hiera backend logic to get around a limitation of hiera where you cannot have multiple backends of the same type. This class is just a subclass of the built in yaml backend. there is no difference in the backends other than the namespace



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# File 'lib/hiera/backend/yamll_backend.rb', line 12

def initialize(cache=nil)
  require 'yaml'
  Hiera.debug("Hiera YAMLL backend starting")
  @cache = cache || Filecache.new
end

Instance Method Details

#lookup(key, scope, order_override, resolution_type, context = nil) ⇒ Object

context is for newer versions of hiera and we will use that variable as a way to determine versions of hiera



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# File 'lib/hiera/backend/yamll_backend.rb', line 19

def lookup(key, scope, order_override, resolution_type, context=nil)
  answer = nil
  found = false
  newer_hiera_version = Hiera::VERSION >= '3.0.0'

  Hiera.debug("Looking up #{key} in YAMLL backend")
  Backend.datasourcefiles(:yamll, scope, "yaml", order_override) do |source, yamlfile|
    data = @cache.read_file(yamlfile, Hash) do |data|
      YAML.load(data) || {}
    end

    next if data.empty?
    next unless data.include?(key)
    found = true

    # 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.
    Hiera.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
    if newer_hiera_version
      # versions of newer hiera use a context
      new_answer = Backend.parse_answer(data[key], scope, {}, context)
    else
      new_answer = Backend.parse_answer(data[key], scope, {})
    end
    case resolution_type.is_a?(Hash) ? :hash : resolution_type
    when :array
      raise Exception, "Hiera type mismatch for key '#{key}': 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 for key '#{key}': expected Hash and got #{new_answer.class}" unless new_answer.kind_of? Hash
      answer ||= {}
      if newer_hiera_version
        answer = Backend.merge_answer(new_answer, answer, resolution_type)
      else
        answer = Backend.merge_answer(new_answer, answer)
      end
    else
      answer = new_answer
      break
    end
  end
  if newer_hiera_version
    throw :no_such_key unless found
  end
  return answer
end