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# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com> # # This file is part of Ansible # # Ansible is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # Ansible is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Ansible. If not, see <http://www.gnu.org/licenses/>. # Make coding more python3-ish from __future__ import (absolute_import, division, print_function) __metaclass__ = type from collections.abc import Mapping from jinja2.utils import missing from ansible.errors import AnsibleError, AnsibleUndefinedVariable from ansible.module_utils._text import to_native __all__ = ['AnsibleJ2Vars'] class AnsibleJ2Vars(Mapping): ''' Helper class to template all variable content before jinja2 sees it. This is done by hijacking the variable storage that jinja2 uses, and overriding __contains__ and __getitem__ to look like a dict. Added bonus is avoiding duplicating the large hashes that inject tends to be. To facilitate using builtin jinja2 things like range, globals are also handled here. ''' def __init__(self, templar, globals, locals=None): ''' Initializes this object with a valid Templar() object, as well as several dictionaries of variables representing different scopes (in jinja2 terminology). ''' self._templar = templar self._globals = globals self._locals = dict() if isinstance(locals, dict): for key, val in locals.items(): if val is not missing: if key[:2] == 'l_': self._locals[key[2:]] = val elif key not in ('context', 'environment', 'template'): self._locals[key] = val def __contains__(self, k): if k in self._locals: return True if k in self._templar.available_variables: return True if k in self._globals: return True return False def __iter__(self): keys = set() keys.update(self._templar.available_variables, self._locals, self._globals) return iter(keys) def __len__(self): keys = set() keys.update(self._templar.available_variables, self._locals, self._globals) return len(keys) def __getitem__(self, varname): if varname in self._locals: return self._locals[varname] if varname in self._templar.available_variables: variable = self._templar.available_variables[varname] elif varname in self._globals: return self._globals[varname] else: raise KeyError("undefined variable: %s" % varname) # HostVars is special, return it as-is, as is the special variable # 'vars', which contains the vars structure from ansible.vars.hostvars import HostVars if isinstance(variable, dict) and varname == "vars" or isinstance(variable, HostVars) or hasattr(variable, '__UNSAFE__'): return variable else: value = None try: value = self._templar.template(variable) except AnsibleUndefinedVariable as e: # Instead of failing here prematurely, return an Undefined # object which fails only after its first usage allowing us to # do lazy evaluation and passing it into filters/tests that # operate on such objects. return self._templar.environment.undefined( hint=f"{variable}: {e.message}", name=varname, exc=AnsibleUndefinedVariable, ) except Exception as e: msg = getattr(e, 'message', None) or to_native(e) raise AnsibleError("An unhandled exception occurred while templating '%s'. " "Error was a %s, original message: %s" % (to_native(variable), type(e), msg)) return value def add_locals(self, locals): ''' If locals are provided, create a copy of self containing those locals in addition to what is already in this variable proxy. ''' if locals is None: return self # prior to version 2.9, locals contained all of the vars and not just the current # local vars so this was not necessary for locals to propagate down to nested includes new_locals = self._locals | locals return AnsibleJ2Vars(self._templar, self._globals, locals=new_locals)