102 lines
3.6 KiB
Python
102 lines
3.6 KiB
Python
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from ansible.compat.six import iteritems
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from jinja2.utils import missing
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from ansible.utils.unicode import to_unicode
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__all__ = ['AnsibleJ2Vars']
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class AnsibleJ2Vars:
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'''
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Helper class to template all variable content before jinja2 sees it. This is
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done by hijacking the variable storage that jinja2 uses, and overriding __contains__
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and __getitem__ to look like a dict. Added bonus is avoiding duplicating the large
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hashes that inject tends to be.
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To facilitate using builtin jinja2 things like range, globals are also handled here.
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'''
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def __init__(self, templar, globals, locals=None, *extras):
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'''
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Initializes this object with a valid Templar() object, as
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well as several dictionaries of variables representing
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different scopes (in jinja2 terminology).
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'''
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self._templar = templar
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self._globals = globals
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self._extras = extras
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self._locals = dict()
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if isinstance(locals, dict):
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for key, val in iteritems(locals):
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if key[:2] == 'l_' and val is not missing:
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self._locals[key[2:]] = val
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def __contains__(self, k):
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if k in self._templar._available_variables:
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return True
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if k in self._locals:
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return True
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for i in self._extras:
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if k in i:
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return True
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if k in self._globals:
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return True
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return False
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def __getitem__(self, varname):
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if varname not in self._templar._available_variables:
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if varname in self._locals:
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return self._locals[varname]
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for i in self._extras:
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if varname in i:
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return i[varname]
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if varname in self._globals:
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return self._globals[varname]
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else:
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raise KeyError("undefined variable: %s" % varname)
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variable = self._templar._available_variables[varname]
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# HostVars is special, return it as-is, as is the special variable
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# 'vars', which contains the vars structure
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from ansible.vars.hostvars import HostVars
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if isinstance(variable, dict) and varname == "vars" or isinstance(variable, HostVars):
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return variable
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else:
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value = None
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try:
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value = self._templar.template(variable)
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except Exception as e:
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raise type(e)(to_unicode(variable) + ': ' + e.message)
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return value
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def add_locals(self, locals):
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'''
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If locals are provided, create a copy of self containing those
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locals in addition to what is already in this variable proxy.
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'''
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if locals is None:
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return self
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return AnsibleJ2Vars(self._templar, self._globals, locals=locals, *self._extras)
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