routes.rb'

Henrik Lindberg (JIRA) Thu, 18 Feb 2016 11:18:28 -0800

Title: Message Title

PUP-4450

We can use the 4.x loaders to load helper code - even in such a way that it is loaded anonymously. But we cannot transitively load code it in turn depends on - gems etc. That would be considered part of the runtime.

It would be a bit special though, but would enable loading multiple versions of the helper code. We could define this as (winging it from the top of my mind):

# require/load it

puppet_require 'module_realtive/path/to_my_helper'

# instead of using PuppetX::MyName::MyModule - a reference to the class is done indirectly

my_helper = Puppet.get_helper('MyModule::MyHelper')

x = my_helper.new

x.hello("auto loaded helper class")

Instead of making the helper a regular ruby class it is written like the functions are:

Puppet.create_helper_class('MyModule::MyHelper') do

  def hello(name)

    puts "Hello %s" % name

end

end

What this does (just as for functions) is to create an anonymous class; although it is given a name "MyModule::MyHelper" this is not done by binding it to a Ruby Constant. That is what makes it possible to get rid of it, have multiple implementations etc.
Also, binding the instance to a Ruby Constant, a global variable, or class instance variable (in a statically bound class), is not allowed as that would either leak, or make it impossible to redefine it.

But alas, it does not solve the problem of 3d party ruby code. But certainly fixes it for helper code.

You can in fact simulate this today Implement a 4.x function. Add the methods you like on it. Look up that function in Ruby, and call the methods on it. A bit dirty but illustrates the principle. A function is really just a "helper with a puppet interface".

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Jira (PUP-4450) Cannot load 'provider/network_route/routes.rb'

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