finding a phrase through ansible script

[Bishwajit Samanta]

i am having a problem in finding solution. I have a piece of file which contains data in below format (json type with quotes)::-

hostinfo:
  'host001':
    ip: x.x.x.x
    hostclass: 'puppet'
  'host002':
    ip: y.y.y.y
    hostclass: 'ess'
  'host003':
    ip: z.z.z.z
    hostclass: 'mdb'

Now my task is to find out the hostname of the system belong to hostclass 'ess' , which in this case the answer in host002. I have to write an ansible script to find out the result. Can anyone help me in finding out, or any idea to approach for the problem.

Issue Type:: Finding a phrase through ansible
Ansible Version:: Ansible 2.4.0
Component Name:: It looks similar to json type file.

[Matt Martz]

The following task will find that:

    - debug:

        msg: "{{ hostinfo|dictsort|selectattr('1.hostclass', 'equalto', 'ess')|first|first }}"

That takes the `hostinfo` dict, turns it into a list of tuples, selects where `hostclass` equals `ess`, gets the first result (there should only be one here), and then gets the first element.

If you don't have jinja2 version with the `equalto` test, you can replace that with `search` or `match`

It outputs:

TASK [debug] *********************************************************************************************************************************************************************************************************************************

ok: [localhost] => {

    "msg": "host002"

}

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Matt Martz
@sivel
sivel.net

[Bishwajit Samanta]

I am glad you replied so fast, but sorry to say i am not an ansible expert . I am just a beginner . I just typed the code. Can you help me in understanding  where i am not correct.

---

- hosts: devops

  tasks:

    - debug:

       msg: "{{ hostinfo|dictsort|selectattr('1.hostclass', 'equalto', 'ess')|first|first }}"

~

~

[Bishwajit Samanta]

@Matt Martz : I am sorry to ask silly questions, regarding ansible as by seeing the small piece of code, i can understand you must be an ansible expert. If possible you can help me in my problem explanation a bit. 

And any such links for learning you want to refer, please refer me. As i googled selectattr but first|first parameter which you have passed i am not getting any good document. If you can help me in referring such, it would be of very nice help.

[Matt Martz]

Templating in Ansible is handled by Jinja2.  You can find documentation on Jinja2 at http://jinja.pocoo.org/docs/dev/templates/

For the `first` filter specifically: http://jinja.pocoo.org/docs/dev/templates/#first

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[Bishwajit Samanta]

Hi, thanks for sharing the docs link. In the meanwhile i am not able to go in the right direction of solving the problem. so far what i have done is ::

1. converted the text file to json through python.

2. write some ansible codes, which in return it is dumping the contents but i am not able to get the thing i want.

---

- hosts: devops

  gather_facts: no

  vars:

    contents: "{{ lookup('file', '/root/ansible/sample_1.json') | from_json }}"

  tasks:

    - debug:

      msg: "{{ hostinfo|dictsort|selectattr('1.hostclass', 'equalto', 'ess')|first|first }}"

    - debug:

       msg: "{{ contents }}"

Can you guide in my problem please.. 

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