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require 'yaml'
require 'puppet/network'
require 'puppet/network/format'
module Puppet::Network::FormatHandler
class FormatError < Puppet::Error; end
class FormatProtector
attr_reader :format
def protect(method, args)
begin
Puppet::Network::FormatHandler.format(format).send(method, *args)
rescue => details
direction = method.to_s.include?("intern") ? "from" : "to"
error = FormatError.new("Could not #{method} #{direction} #{format}: #{details}")
error.set_backtrace(details.backtrace)
raise error
end
end
def initialize(format)
@format = format
end
[:intern, :intern_multiple, :render, :render_multiple, :mime].each do |method|
define_method(method) do |*args|
protect(method, args)
end
end
end
@formats = {}
def self.create(*args, &block)
instance = Puppet::Network::Format.new(*args)
instance.instance_eval(&block) if block_given?
@formats[instance.name] = instance
instance
end
def self.extended(klass)
klass.extend(ClassMethods)
# LAK:NOTE This won't work in 1.9 ('send' won't be able to send
# private methods, but I don't know how else to do it.
klass.send(:include, InstanceMethods)
end
def self.format(name)
@formats[name.to_s.downcase.intern]
end
def self.format_by_extension(ext)
@formats.each do |name, format|
return format if format.extension == ext
end
nil
end
# Provide a list of all formats.
def self.formats
@formats.keys
end
# Return a format capable of handling the provided mime type.
def self.mime(mimetype)
mimetype = mimetype.to_s.downcase
@formats.values.find { |format| format.mime == mimetype }
end
# Use a delegator to make sure any exceptions generated by our formats are
# handled intelligently.
def self.protected_format(name)
name = format_to_canonical_name(name)
@format_protectors ||= {}
@format_protectors[name] ||= FormatProtector.new(name)
@format_protectors[name]
end
# Return a format name given:
# * a format name
# * a mime-type
# * a format instance
def self.format_to_canonical_name(format)
case format
when Puppet::Network::Format
out = format
when %r{\w+/\w+}
out = mime(format)
else
out = format(format)
end
raise ArgumentError, "No format match the given format name or mime-type (#{format})" if out.nil?
out.name
end
module ClassMethods
def format_handler
Puppet::Network::FormatHandler
end
def convert_from(format, data)
format_handler.protected_format(format).intern(self, data)
end
def convert_from_multiple(format, data)
format_handler.protected_format(format).intern_multiple(self, data)
end
def render_multiple(format, instances)
format_handler.protected_format(format).render_multiple(instances)
end
def default_format
supported_formats[0]
end
def support_format?(name)
Puppet::Network::FormatHandler.format(name).supported?(self)
end
def supported_formats
result = format_handler.formats.collect { |f| format_handler.format(f) }.find_all { |f| f.supported?(self) }.collect { |f| f.name }.sort do |a, b|
# It's an inverse sort -- higher weight formats go first.
format_handler.format(b).weight <=> format_handler.format(a).weight
end
result = put_preferred_format_first(result)
Puppet.debug "#{friendly_name} supports formats: #{result.map{ |f| f.to_s }.sort.join(' ')}; using #{result.first}"
result
end
private
def friendly_name
if self.respond_to? :indirection
indirection.name
else
self
end
end
def put_preferred_format_first(list)
preferred_format = Puppet.settings[:preferred_serialization_format].to_sym
if list.include?(preferred_format)
list.delete(preferred_format)
list.unshift(preferred_format)
else
Puppet.debug "Value of 'preferred_serialization_format' (#{preferred_format}) is invalid for #{friendly_name}, using default (#{list.first})"
end
list
end
end
module InstanceMethods
def render(format = nil)
format ||= self.class.default_format
Puppet::Network::FormatHandler.protected_format(format).render(self)
end
def mime(format = nil)
format ||= self.class.default_format
Puppet::Network::FormatHandler.protected_format(format).mime
end
def support_format?(name)
self.class.support_format?(name)
end
end
end
require 'puppet/network/formats'
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