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# A simple wrapper for templates, so they don't have full access to
# the scope objects.
class Puppet::Parser::TemplateWrapper
attr_accessor :scope, :file, :string
include Puppet::Util
Puppet::Util.logmethods(self)
def initialize(scope)
@__scope__ = scope
end
def scope
@__scope__
end
# Should return true if a variable is defined, false if it is not
def has_variable?(name)
if scope.lookupvar(name.to_s, false) != :undefined
true
else
false
end
end
# Allow templates to access the defined classes
def classes
return scope.catalog.classes
end
# Allow templates to access the tags defined in the current scope
def tags
return scope.tags
end
# Allow templates to access the all the defined tags
def all_tags
return scope.catalog.tags
end
# Ruby treats variables like methods, so we used to expose variables
# within scope to the ERB code via method_missing. As per RedMine #1427,
# though, this means that conflicts between methods in our inheritance
# tree (Kernel#fork) and variable names (fork => "yes/no") could arise.
#
# Worse, /new/ conflicts could pop up when a new kernel or object method
# was added to Ruby, causing templates to suddenly fail mysteriously when
# Ruby was upgraded.
#
# To ensure that legacy templates using unqualified names work we retain
# the missing_method definition here until we declare the syntax finally
# dead.
def method_missing(name, *args)
# We have to tell lookupvar to return :undefined to us when
# appropriate; otherwise it converts to "".
value = scope.lookupvar(name.to_s, false)
if value != :undefined
return value
else
# Just throw an error immediately, instead of searching for
# other missingmethod things or whatever.
raise Puppet::ParseError, "Could not find value for '%s'" % name
end
end
def file=(filename)
@file = Puppet::Module::find_template(filename, scope.compiler.environment)
unless FileTest.exists?(file)
raise Puppet::ParseError,
"Could not find template %s" % file
end
# We'll only ever not have a parser in testing, but, eh.
if scope.parser
scope.parser.watch_file(file)
end
@string = File.read(file)
end
def result(string = nil)
if string
self.string = string
template_source = "inline template"
else
template_source = file
end
# Expose all the variables in our scope as instance variables of the
# current object, making it possible to access them without conflict
# to the regular methods.
benchmark(:debug, "Bound template variables for #{template_source}") do
scope.to_hash.each { |name, value|
if name.kind_of?(String)
realname = name.gsub(/[^\w]/, "_")
else
realname = name
end
instance_variable_set("@#{realname}", value)
}
end
result = nil
benchmark(:debug, "Interpolated template #{template_source}") do
template = ERB.new(self.string, 0, "-")
result = template.result(binding)
end
result
end
def to_s
"template[%s]" % (file ? file : "inline")
end
end
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