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[Inventory] Cache the result of enumerating groups and host names

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for `VariableManager._get_magic_variables()`.

This saves a lot of time re-iterating the nearly always constant global
list of groups and their members.

Generate once and cache, and invalidate cache in case `add_host:` or
`group_by:` are used.
This commit is contained in:
Tobias Wolf 2016-08-30 14:27:06 +02:00 • committed by James Cammarata
commit c23b11d212
4 changed files with 38 additions and 11 deletions
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6
lib/ansible/plugins/strategy/__init__.py
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@ -475,6 +475,9 @@ class StrategyBase:
# patterns may have referenced the group
self._inventory.clear_pattern_cache()
# clear cache of group dict, which is used in magic host variables
self._inventory.clear_group_dict_cache()
# also clear the hostvar cache entry for the given play, so that
# the new hosts are available if hostvars are referenced
self._variable_manager.invalidate_hostvars_cache(play=iterator._play)
@ -495,6 +498,9 @@ class StrategyBase:
group_name = result_item.get('add_group')
new_group = self._inventory.get_group(group_name)
if not new_group:
# clear cache of group dict, which is used in magic host variables
self._inventory.clear_group_dict_cache()
# create the new group and add it to inventory
new_group = Group(name=group_name)
self._inventory.add_group(new_group)