Ansible command loop amend string value and push original value into new array

Hi I'm using ansible to create some elastic search indexes using laravel's artisan commands. The issue I have is that when I have to create an index I have to use the php class name which the base name is snake cased from camel case e.g. UserConfigurator = user_configurator. In my vars I have the following;

elastic_search:
version: 6.3.2
indexes:
- "App\ElasticSearch\Configurators\UserConfigurator"
- "App\ElasticSearch\Configurators\ClientConfigurator"
models:
- "App\Models\User"
- "App\Models\Client"


and in my playbook I have the following;

- name: check if indexes exist
uri: url='http://localhost:9200/ index_name '
method=HEAD
status_code=200,404

- name: create indexes
command: php artisan elastic:create-index " item "
args:
chdir: "site_root"
with_items: "elastic_search.indexes"


The playbook isn't sufficient enough to do what I want to do due to lack of experience. Any ideas how I may loop over each elastic_search.indexes and convert the class basename to a snake case and check to see if the index exists or not and push them into two separate arrays so then I can use the one of the new variables to create the index and the other variable to update the index?

1 Answer
1

Any ideas how I may loop over each elastic_search.indexes and convert the class basename to a snake case

The algorithm I use for snake-casing something is to break the word at an upper-to-lower boundary, lowercase the entire thing, then reassemble the parts, being mindful that the first upper-to-lower transition is special and should not be separated by _.

_

We can leverage the behavior that when set_fact sees a block of text that looks like JSON, it will coerce that block of text into a dict (you'll see that behavior on the command line with ansible -e '"hello": "world"' too), along with the infinitely handy regex_replace jinja2 filter provided by ansible:

set_fact

dict

ansible -e '"hello": "world"'

regex_replace

- hosts: all
gather_facts: no
vars:
class_names:
- 'AppElasticSearchConfiguratorsUserConfigurator'
- 'AppElasticSearchConfiguratorsClientConfigurator'
tasks:
- set_fact:
index_names: >-
[
% for cn in class_names -%
'' if loop.first else ','

regex_replace("([A-Z])([a-z])", "x0012")
% endfor %
]
with_items: ' class_names '
- debug: var=index_names verbosity=0
- debug: var=item verbosity=0
with_items: ' index_names '


which produces the correct output:

TASK [debug] *******************************************************************
ok: [localhost] => (item=user_configurator) =>
"item": "user_configurator"

ok: [localhost] => (item=client_configurator) =>
"item": "client_configurator"



and now you can use those indices in a command of your choosing.

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