Class: Hiera::Backend::Regex_backend

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

Instance Method Summary collapse

Constructor Details

#initialize(cache = nil) ⇒ Regex_backend

TODO: Support JSON or YAML format and initialize accordingly



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# File 'lib/hiera/backend/regex_backend.rb', line 8

def initialize(cache=nil)
   require 'yaml'
   @cache = cache || Filecache.new
end

Instance Method Details

#datasourcefiles(scope) ⇒ Object 



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# File 'lib/hiera/backend/regex_backend.rb', line 72

def datasourcefiles(scope)
  datadir = Backend.datadir(:regex, scope)
  datasources(scope) do |source|
    file = Backend.datafile(:regex, scope, source, :regex)
    if file
      yield(file)
    end
  end
end

#datasources(scope) ⇒ Object 



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# File 'lib/hiera/backend/regex_backend.rb', line 58

def datasources(scope)
  datadir = Backend.datadir(:regex, scope)
  Config[:hierarchy].flatten.map do |source|
    # We only support data sources that end in a key.  Keys found
    # in the middle of a datasource's name are impossible to support since
    # standard file names do not do well containing regular experssion patterns
    if source =~ /\}$/
      # We need to strip out the ending key's %{::} characters so that they do not
      # get interpolated when we call parse_string
      yield(Backend.parse_string(source.gsub(/%\{:*([^\{]*)\}$/, '\1'), scope))
    end
  end
end

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

TODO: Support multiple resolution_types, currently only supports :priority



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# File 'lib/hiera/backend/regex_backend.rb', line 14

def lookup(key, scope, order_override, resolution_type)
  answer = nil
  datasourcefiles(scope) do |source|
    scope_key = File.basename(source, ".regex")
    scope_key = "::#{scope_key}" if ! scope[scope_key]
    if ! scope[scope_key]
      Hiera.debug("Could not find key #{scope_key} within scope, skipping check for source #{source}")
      next
    end
    Hiera.debug("Checking #{source} for #{scope_key} regex matching #{scope[scope_key]}")

    # TODO: Add support for more than just YAML format
    data = YAML.load(@cache.read(source))

    next if ! data
    next if data.empty?

    lineno = 0
    data.each do |item|
      lineno = lineno + 1
      item.each_key do |regex_key|
        if scope[scope_key] =~ /#{regex_key}/ and item[regex_key].has_key?(key)
          Hiera.debug("#{scope_key} with value of '#{scope[scope_key]}' matched regex /#{regex_key}/ at #{source}:#{lineno}")
          new_answer = Backend.parse_answer(item[regex_key][key], scope)
          case 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 ||= {}
            answer = Backend.merge_answer(new_answer,answer)
          else
            answer = new_answer
            return answer
          end
        end
      end
    end
  end
  return answer
end