[FactCache] define first_order_merge method (#55781)

* Add first_order_merge method

Add test for updating a key that already exists

* changelog
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Sloane Hertel 2019-06-10 14:34:06 -04:00 committed by GitHub
commit 598a058afe
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@ -58,6 +58,19 @@ class FactCache(MutableMapping):
""" Flush the fact cache of all keys. """
self._plugin.flush()
def first_order_merge(self, key, value):
host_facts = {key: value}
try:
host_cache = self._plugin.get(key)
if host_cache:
host_cache.update(value)
host_facts[key] = host_cache
except KeyError:
pass
super(FactCache, self).update(host_facts)
def update(self, *args):
"""
Backwards compat shim