this actually looks like what I'm looking for: 

https://groups.google.com/d/msg/ansible-devel/DQiGednLgU0/JIvQ2Z-zFQAJ

specifically the 
get_variable_manager() 
method. 

On Tuesday, February 20, 2018 at 10:40:35 AM UTC-8, shaun smiley wrote:
>
> Ah, I was starting to trace through Ansible but hadn't found yet where the 
> CallBack is instantiated.  
>
> v2_playbook_on_play_start receives an arg called "play".  That gives the 
> list of nodes as their passed into the command line; i.e. names of groups 
> are not broken out.  I'd prefer to have a list of computed hosts at some 
> point before v2_playbook_on_stats at the very end.  
>
> --Shaun
>
> On Mon, Feb 19, 2018 at 6:36 AM, Matt Martz <m...@sivel.net> wrote:
>
>> The earliest you can start to get info like that is during 
>> `v2_playbook_on_play_start`
>>
>> `__init__` is run during object instantiation, which happens before a 
>> playbook and play have been parsed.  Since a play is where the hosts live, 
>> you will have to wait until that point.
>>
>> On Sat, Feb 17, 2018 at 11:18 PM, shaun smiley <senorsm...@gmail.com> 
>> wrote:
>>
>>> I am developing a custom callback plugin.  
>>>
>>> I need to know the computed list of hosts in the constructor (i.e. the 
>>> __init__method of my CallbackModule).  
>>> This should be all hosts currently limited, not necessarily which hosts 
>>> will actually be called in any particular play (which may vary of course).  
>>>
>>> Is this even possible to grab at that point?
>>>
>>>
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>>
>>
>>
>> -- 
>> Matt Martz
>> @sivel
>> sivel.net
>>
>
>

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