Merge pull request #10305 from bcoca/cartesian

Cartesian

docsite/rst/playbooks_lookups.rst

@@ -97,10 +97,6 @@ To enter comma use two commas ',,' somewhere - preferably at the end. Quotes and
 More Lookups
 ````````````
 
-.. note:: This feature is very infrequently used in Ansible.  You may wish to skip this section.
-
-.. versionadded:: 0.8
-
 Various *lookup plugins* allow additional ways to iterate over data.  In :doc:`Loops <playbooks_loops>` you will learn
 how to use them to walk over collections of numerous types.  However, they can also be used to pull in data
 from remote sources, such as shell commands or even key value stores. This section will cover lookup
@@ -131,10 +127,18 @@ Here are some examples::
 
          - debug: msg="{{ lookup('etcd', 'foo') }} is a value from a locally running etcd"
 
+         # The following lookups were added in 1.9
          - debug: msg="{{item}}"
            with_url:
                 - 'http://github.com/gremlin.keys'
 
+         # outputs the cartesian product of the supplied lists
+         - debug: msg="{{item}}"
+           with_cartesian:
+                - list1
+                - list2
+                - list3
+
 As an alternative you can also assign lookup plugins to variables or use them
 elsewhere.  This macros are evaluated each time they are used in a task (or
 template)::

lib/ansible/runner/lookup_plugins/cartesian.py

+# (c) 2013, Bradley Young <young.bradley@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/>.
+
+import ansible.utils as utils
+import ansible.errors as errors
+from itertools import product
+
+def flatten(terms):
+    ret = []
+    for term in terms:
+        if isinstance(term, list):
+            ret.extend(term)
+        elif isinstance(term, tuple):
+            ret.extend(term)
+        else:
+            ret.append(term)
+    return ret
+
+class LookupModule(object):
+    """
+    Create the cartesian product of lists
+    [1, 2, 3], [a, b] -> [1, a], [1, b], [2, a], [2, b], [3, a], [3, b]
+    """
+
+    def __init__(self, basedir=None, **kwargs):
+        self.basedir = basedir
+
+    def __lookup_injects(self, terms, inject):
+        results = []
+        for x in terms:
+            intermediate = utils.listify_lookup_plugin_terms(x, self.basedir, inject)
+            results.append(intermediate)
+        return results
+
+    def run(self, terms, inject=None, **kwargs):
+
+        terms = utils.listify_lookup_plugin_terms(terms, self.basedir, inject)
+        terms = self.__lookup_injects(terms, inject)
+
+        my_list = terms[:]
+        if len(my_list) == 0:
+            raise errors.AnsibleError("with_cartesian requires at least one element in each list")
+        return [flatten(x) for x in product(*my_list)]
+
+

v2/ansible/plugins/lookup/cartesian.py

+# (c) 2013, Bradley Young <young.bradley@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/>.
+
+from itertools import product
+
+from ansible.errors import *
+from ansible.plugins.lookup import LookupBase
+from ansible.utils.listify import listify_lookup_plugin_terms
+
+class LookupModule(LookupBase):
+    """
+    Create the cartesian product of lists
+    [1, 2, 3], [a, b] -> [1, a], [1, b], [2, a], [2, b], [3, a], [3, b]
+    """
+
+    def __lookup_variabless(self, terms, variables):
+        results = []
+        for x in terms:
+            intermediate = listify_lookup_plugin_terms(x, variables, loader=self._loader)
+            results.append(intermediate)
+        return results
+
+    def run(self, terms, variables=None, **kwargs):
+
+        terms = self.__lookup_variabless(terms, variables)
+
+        my_list = terms[:]
+        if len(my_list) == 0:
+            raise errors.AnsibleError("with_cartesian requires at least one element in each list")
+
+        return [self._flatten(x) for x in product(*my_list, fillvalue=None)]
+