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shuffle filter: added optional 'seed' parameter

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Alexander Gubin 2017-01-02 10:50:04 +01:00 • committed by Brian Coca
parent f9385cb972
commit fce9f4f679
2 changed files with 10 additions and 2 deletions
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4
docsite/rst/playbooks_filters.rst
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@ -185,6 +185,10 @@ To get a random list from an existing list::
{{ ['a','b','c']|shuffle }} => ['c','a','b'] {{ ['a','b','c']|shuffle }} => ['c','a','b']
{{ ['a','b','c']|shuffle }} => ['b','c','a'] {{ ['a','b','c']|shuffle }} => ['b','c','a']
As of Ansible version 2.3, it's also possible to shuffle a list idempotent. All you need is a seed.::
{{ ['a','b','c']|shuffle(seed=inventory_hostname) }} => ['b','a','c']
note that when used with a non 'listable' item it is a noop, otherwise it always returns a list note that when used with a non 'listable' item it is a noop, otherwise it always returns a list

8
lib/ansible/plugins/filter/core.py
View file

@ -217,10 +217,14 @@ def rand(environment, end, start=None, step=None, seed=None):
else: else:
raise errors.AnsibleFilterError('random can only be used on sequences and integers') raise errors.AnsibleFilterError('random can only be used on sequences and integers')
def randomize_list(mylist): def randomize_list(mylist, seed=None):
try: try:
mylist = list(mylist) mylist = list(mylist)
shuffle(mylist) if seed:
r = Random(seed)
r.shuffle(mylist)
else:
shuffle(mylist)
except: except:
pass pass
return mylist return mylist