Filter plugins

[Valentin Fadeev]

Recently I had to write templates containing somewhat long filter pipelines. Part of the logic involved lookuping current output of the pipeline in a dictionary (hostvars) and then extracting the value of a field of the resulting dictionary. In order to keep things decoupled I wrote two almost trivial plugins. Here an example:

 - name: find another host to join to form a cluster (e.g. Consul)
   set_fact:
     host_to_join: >
     {{
       groups['my_group'] | difference([inventory_hostname])
                          | list
                          | random
                          | find_in(hostvars)
                          | get_key('ec2_private_ip_address')
     }}

Just wondering whether there are other existing ways of achieving the same result, with/without plugins, as surely someone must have faced a similar task.

Thanks
Valentin

[Brian Coca]

something like:

- name: find another host to join to form a cluster (e.g. Consul)
set_fact:
host_to_join: >
{{

(groups['my_group'] | difference([inventory_hostname])
| random
| intersection(hostvars.keys())
).'ec2_private_ip_address'

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--
Brian Coca