Class: Hiera::Backend::Proxy_backend

Inherits:
Object
  • Object
show all
Defined in:
puppet/modules/wmflib/lib/hiera/backend/proxy_backend.rb

Overview

This naming is required by puppet.

Instance Method Summary collapse

Constructor Details

#initializeProxy_backend

Returns a new instance of Proxy_backend



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# File 'puppet/modules/wmflib/lib/hiera/backend/proxy_backend.rb', line 26

def initialize
  Hiera.debug "Starting the proxy backend"
  @config = Config[:proxy]
  load_plugins
end

Instance Method Details

#load_pluginsObject



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# File 'puppet/modules/wmflib/lib/hiera/backend/proxy_backend.rb', line 32

def load_plugins
  @plugins ||= {}
  # Load plugins only once
  @config[:plugins].each do |plugin|
    Hiera.debug "Loading plugin #{plugin}"
    begin
      require "hiera/backend/#{plugin.downcase}_backend"
      @plugins[plugin] ||=
        Backend.const_get("#{plugin.capitalize}_backend").new
    rescue
      Hiera.warn "Failure: plugin #{plugin} failed to load"
    end
  end
end

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



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# File 'puppet/modules/wmflib/lib/hiera/backend/proxy_backend.rb', line 47

def lookup(key, scope, order_override, resolution_type)
  answer = nil
  hierarchy = Config[:hierarchy].clone

  Backend.datasources(scope, order_override) do |source|
    if source.include? '@@'
      plugin, source = source.split('@@')
    else
      plugin = @config[:default_plugin]
    end
    unless @plugins.include? plugin
      Hiera.
        warn "Hierarchy specifies to use plugin '#{plugin}' but can't find it"
      next
    end
    # We look up onto a foreign backend by limiting us to a
    # single element of hierarchy.
    Config[:hierarchy] = [source]
    new_answer = @plugins[plugin].
                 lookup(key, scope, order_override,
                        resolution_type)
    Config[:hierarchy] = hierarchy

    next if new_answer.nil?

    case resolution_type
    when :array
      raise Exception, "Hiera type mismatch: expected Array and got #{new_answer.class}" unless new_answer.kind_of? Array
      # The plugins already return an array of answers, so just concatenate it.
      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

  answer
end