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119 lines
3.8 KiB
Python
119 lines
3.8 KiB
Python
# (c) 2012-2014, 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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import collections
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from jinja2.runtime import Undefined
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from ansible.module_utils._text import to_bytes
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from ansible.template import Templar
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STATIC_VARS = [
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'ansible_version',
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'ansible_play_hosts',
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'inventory_hostname',
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'inventory_hostname_short',
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'inventory_file',
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'inventory_dir',
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'groups',
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'group_names',
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'omit',
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'playbook_dir',
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'play_hosts',
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'role_names',
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'ungrouped',
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]
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try:
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from hashlib import sha1
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except ImportError:
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from sha import sha as sha1
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__all__ = ['HostVars']
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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, inventory, variable_manager, loader):
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self._lookup = dict()
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self._inventory = inventory
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self._loader = loader
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self._variable_manager = variable_manager
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variable_manager._hostvars = self
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self._cached_result = dict()
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def set_variable_manager(self, variable_manager):
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self._variable_manager = variable_manager
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variable_manager._hostvars = self
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def set_inventory(self, inventory):
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self._inventory = inventory
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def _find_host(self, host_name):
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# does not use inventory.hosts so it can create localhost on demand
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return self._inventory.get_host(host_name)
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def raw_get(self, host_name):
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'''
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Similar to __getitem__, however the returned data is not run through
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the templating engine to expand variables in the hostvars.
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'''
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host = self._find_host(host_name)
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if host is None:
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return Undefined(name="hostvars['%s']" % host_name)
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return self._variable_manager.get_vars(host=host, include_hostvars=False)
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def __getitem__(self, host_name):
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data = self.raw_get(host_name)
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sha1_hash = sha1(to_bytes(data)).hexdigest()
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if sha1_hash not in self._cached_result:
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templar = Templar(variables=data, loader=self._loader)
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self._cached_result[sha1_hash] = templar.template(data, fail_on_undefined=False, static_vars=STATIC_VARS)
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return self._cached_result[sha1_hash]
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def set_host_variable(self, host, varname, value):
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self._variable_manager.set_host_variable(host, varname, value)
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def set_nonpersistent_facts(self, host, facts):
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self._variable_manager.set_nonpersistent_facts(host, facts)
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def set_host_facts(self, host, facts):
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self._variable_manager.set_host_facts(host, facts)
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def __contains__(self, host_name):
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# does not use inventory.hosts so it can create localhost on demand
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return self._find_host(host_name) is not None
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def __iter__(self):
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for host in self._inventory.hosts:
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yield host
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def __len__(self):
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return len(self._inventory.hosts)
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def __repr__(self):
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out = {}
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for host in self._inventory.hosts:
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out[host] = self.get(host)
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return repr(out)
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