Class: Jerakia::Schema

Inherits:
Object
  • Object
show all
Defined in:
lib/jerakia/schema.rb

Instance Method Summary collapse

Constructor Details

#initialize(request, opts) ⇒ Schema

Arguments: request(Jerakia::Request), opts(Hash)

Raises:



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# File 'lib/jerakia/schema.rb', line 5

def initialize(request,opts)
  schema_datasource=datasource(opts)
  schema_request=Jerakia::Request.new(
    :metadata   => request.metadata,
    :key        => request.key,
    :namespace  => request.namespace,
    :use_schema => false,
  )

  Jerakia.log.debug("Schema lookup invoked for #{request.key} namespace: #{request.namespace}")
  schema_lookup = Jerakia::Launcher.new(schema_request) 


  begin
    schema_lookup.evaluate do
      policy :schema do
        lookup :schema do
          datasource *schema_datasource
        end
      end
    end
  rescue Jerakia::Error => e
    raise Jerakia::SchemaError, "Schema lookup for #{request.key} failed: #{e.message}"
  end

  
  @schema_data = schema_lookup.answer.payload || {}

  # Validate the returned data from the schema
  raise Jerakia::SchemaError, "Schema must return a hash for key #{request.key}" unless @schema_data.is_a?(Hash)

  valid_opts = [ "alias", "cascade", "merge" ]
  @schema_data.keys.each do |key|
    unless valid_opts.include?(key)
      raise Jerakia::SchemaError, "Unknown schema option #{key} for key #{request.key}"
    end
  end

  


  Jerakia.log.debug("Schema returned #{@schema_data}")

  if salias = @schema_data["alias"]
    Jerakia.log.debug("Schema alias found to #{@schema_data["alias"]}")
    request.namespace=Array(salias["namespace"]) if salias["namespace"]
    request.key = salias["key"] if salias["key"]
  end


  if @schema_data["cascade"]
    Jerakia.log.debug("Overriding lookup_type from #{request.lookup_type} to :cascade")
    request.lookup_type= :cascade
  end

  if @schema_data["merge"]
    if ["array", "hash", "deep_hash"].include?(@schema_data["merge"])
      request.merge = @schema_data["merge"].to_sym
    else
      raise Jerakia::SchemaError, "Invalid merge type #{@schema_data['merge']} found in schema for key #{request.key}" 
    end
  end

end

Instance Method Details

#datasource(opts = {}) ⇒ Object 



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# File 'lib/jerakia/schema.rb', line 70

def datasource(opts={})
  [ 
    :file, {
      :docroot        => opts["docroot"] || "/var/lib/jerakia/schema",
      :format         => opts["format"]  || :json,
      :enable_caching => opts["enable_caching"] || true,
      :searchpath     => [ '' ],
    }
  ] 
end