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@ -19,13 +19,16 @@
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import collections
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from jinja2 import Undefined as j2undefined
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from ansible.template import Templar
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__all__ = ['HostVars']
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class HostVars(dict):
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# Note -- this is a Mapping, not a MutableMapping
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class HostVars(collections.Mapping):
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''' A special view of vars_cache that adds values from the inventory when needed. '''
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def __init__(self, vars_manager, play, inventory, loader):
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@ -36,7 +39,7 @@ class HostVars(dict):
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self._lookup = {}
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def __getitem__(self, host_name):
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if host_name not in self._lookup:
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host = self._inventory.get_host(host_name)
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if not host:
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@ -46,3 +49,13 @@ class HostVars(dict):
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self._lookup[host_name] = templar.template(result, fail_on_undefined=False)
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return self._lookup[host_name]
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def __contains__(self, host_name):
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item = self.get(host_name)
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if item and item is not j2undefined:
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return True
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return False
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def __iter__(self):
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raise NotImplementedError('HostVars does not support iteration as hosts are discovered on an as needed basis.')
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def __len__(self):
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raise NotImplementedError('HostVars does not support len. hosts entries are discovered dynamically as needed')
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