9773a1f289
* Add a Singleton class, use it with Display * update six import * Move remaining failes to display singleton * Fix rebase issues * Singleton improvements * Add code-smell for 'from __main__ import display'. ci_complete * s/self/cls/g * Add docs for no-main-display * Address linting issues * Add changelog fragment. ci_complete * Implement reentrant lock for class instantiation in Singleton * Add Display singleton porting guide
125 lines
4.3 KiB
Python
125 lines
4.3 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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from abc import abstractmethod
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from ansible.errors import AnsibleFileNotFound
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from ansible.plugins import AnsiblePlugin
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from ansible.utils.display import Display
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display = Display()
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__all__ = ['LookupBase']
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class LookupBase(AnsiblePlugin):
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def __init__(self, loader=None, templar=None, **kwargs):
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super(LookupBase, self).__init__()
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self._loader = loader
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self._templar = templar
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# Backwards compat: self._display isn't really needed, just import the global display and use that.
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self._display = display
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def get_basedir(self, variables):
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if 'role_path' in variables:
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return variables['role_path']
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else:
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return self._loader.get_basedir()
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@staticmethod
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def _flatten(terms):
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ret = []
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for term in terms:
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if isinstance(term, (list, tuple)):
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ret.extend(term)
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else:
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ret.append(term)
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return ret
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@staticmethod
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def _combine(a, b):
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results = []
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for x in a:
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for y in b:
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results.append(LookupBase._flatten([x, y]))
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return results
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@staticmethod
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def _flatten_hash_to_list(terms):
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ret = []
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for key in terms:
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ret.append({'key': key, 'value': terms[key]})
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return ret
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@abstractmethod
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def run(self, terms, variables=None, **kwargs):
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"""
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When the playbook specifies a lookup, this method is run. The
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arguments to the lookup become the arguments to this method. One
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additional keyword argument named ``variables`` is added to the method
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call. It contains the variables available to ansible at the time the
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lookup is templated. For instance::
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"{{ lookup('url', 'https://toshio.fedorapeople.org/one.txt', validate_certs=True) }}"
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would end up calling the lookup plugin named url's run method like this::
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run(['https://toshio.fedorapeople.org/one.txt'], variables=available_variables, validate_certs=True)
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Lookup plugins can be used within playbooks for looping. When this
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happens, the first argument is a list containing the terms. Lookup
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plugins can also be called from within playbooks to return their
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values into a variable or parameter. If the user passes a string in
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this case, it is converted into a list.
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Errors encountered during execution should be returned by raising
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AnsibleError() with a message describing the error.
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Any strings returned by this method that could ever contain non-ascii
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must be converted into python's unicode type as the strings will be run
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through jinja2 which has this requirement. You can use::
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from ansible.module_utils._text import to_text
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result_string = to_text(result_string)
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"""
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pass
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def find_file_in_search_path(self, myvars, subdir, needle, ignore_missing=False):
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'''
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Return a file (needle) in the task's expected search path.
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'''
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if 'ansible_search_path' in myvars:
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paths = myvars['ansible_search_path']
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else:
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paths = [self.get_basedir(myvars)]
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result = None
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try:
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result = self._loader.path_dwim_relative_stack(paths, subdir, needle)
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except AnsibleFileNotFound:
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if not ignore_missing:
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self._display.warning("Unable to find '%s' in expected paths (use -vvvvv to see paths)" % needle)
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return result
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