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commit
5a64b2e269
3 changed files with 113 additions and 4 deletions
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@ -97,10 +97,6 @@ To enter comma use two commas ',,' somewhere - preferably at the end. Quotes and
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More Lookups
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More Lookups
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````````````
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````````````
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.. note:: This feature is very infrequently used in Ansible. You may wish to skip this section.
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.. versionadded:: 0.8
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Various *lookup plugins* allow additional ways to iterate over data. In :doc:`Loops <playbooks_loops>` you will learn
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Various *lookup plugins* allow additional ways to iterate over data. In :doc:`Loops <playbooks_loops>` you will learn
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how to use them to walk over collections of numerous types. However, they can also be used to pull in data
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how to use them to walk over collections of numerous types. However, they can also be used to pull in data
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from remote sources, such as shell commands or even key value stores. This section will cover lookup
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from remote sources, such as shell commands or even key value stores. This section will cover lookup
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@ -131,10 +127,18 @@ Here are some examples::
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- debug: msg="{{ lookup('etcd', 'foo') }} is a value from a locally running etcd"
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- debug: msg="{{ lookup('etcd', 'foo') }} is a value from a locally running etcd"
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# The following lookups were added in 1.9
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- debug: msg="{{item}}"
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- debug: msg="{{item}}"
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with_url:
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with_url:
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- 'http://github.com/gremlin.keys'
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- 'http://github.com/gremlin.keys'
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# outputs the cartesian product of the supplied lists
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- debug: msg="{{item}}"
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with_cartesian:
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- list1
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- list2
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- list3
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As an alternative you can also assign lookup plugins to variables or use them
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As an alternative you can also assign lookup plugins to variables or use them
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elsewhere. This macros are evaluated each time they are used in a task (or
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elsewhere. This macros are evaluated each time they are used in a task (or
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template)::
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template)::
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59
lib/ansible/runner/lookup_plugins/cartesian.py
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59
lib/ansible/runner/lookup_plugins/cartesian.py
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@ -0,0 +1,59 @@
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# (c) 2013, Bradley Young <young.bradley@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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import ansible.utils as utils
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import ansible.errors as errors
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from itertools import product
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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):
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ret.extend(term)
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elif isinstance(term, 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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class LookupModule(object):
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"""
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Create the cartesian product of lists
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[1, 2, 3], [a, b] -> [1, a], [1, b], [2, a], [2, b], [3, a], [3, b]
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"""
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def __init__(self, basedir=None, **kwargs):
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self.basedir = basedir
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def __lookup_injects(self, terms, inject):
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results = []
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for x in terms:
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intermediate = utils.listify_lookup_plugin_terms(x, self.basedir, inject)
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results.append(intermediate)
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return results
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def run(self, terms, inject=None, **kwargs):
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terms = utils.listify_lookup_plugin_terms(terms, self.basedir, inject)
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terms = self.__lookup_injects(terms, inject)
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my_list = terms[:]
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if len(my_list) == 0:
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raise errors.AnsibleError("with_cartesian requires at least one element in each list")
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return [flatten(x) for x in product(*my_list)]
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46
v2/ansible/plugins/lookup/cartesian.py
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46
v2/ansible/plugins/lookup/cartesian.py
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@ -0,0 +1,46 @@
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# (c) 2013, Bradley Young <young.bradley@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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from itertools import product
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from ansible.errors import *
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from ansible.plugins.lookup import LookupBase
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from ansible.utils.listify import listify_lookup_plugin_terms
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class LookupModule(LookupBase):
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"""
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Create the cartesian product of lists
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[1, 2, 3], [a, b] -> [1, a], [1, b], [2, a], [2, b], [3, a], [3, b]
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"""
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def __lookup_variabless(self, terms, variables):
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results = []
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for x in terms:
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intermediate = listify_lookup_plugin_terms(x, variables, loader=self._loader)
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results.append(intermediate)
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return results
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def run(self, terms, variables=None, **kwargs):
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terms = self.__lookup_variabless(terms, variables)
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my_list = terms[:]
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if len(my_list) == 0:
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raise errors.AnsibleError("with_cartesian requires at least one element in each list")
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return [self._flatten(x) for x in product(*my_list, fillvalue=None)]
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