Parsing JSON from Ansible - json

Question

I'm looking on the web but I'm unable to find a solution, the scenario in quite complex.
I have one json array with values like these:
[
{
"IP1": "1.2.3.4"
"IP1_VLAN": "900 - CLOUD-DEV"
"IP1_Role": "Management"
"IP2": "4.5.6.7"
"IP2_VLAN": "901 - CLOUD-DEV"
"IP2_Role": "Production"
"IP2": "8.9.10.11"
"IP2_VLAN": "902 - CLOUD-DEV"
"IP2_Role": "Backup"
}
]
My goal is: "Select the IP with the role of Management and tell me the address", it should select IP*_Role == Management and tell me in this case 1.2.3.4
Do you have any idea how to deal with this?

Answer 1

Following my comment, my 2 cent answer: searching through your actual data structure is going to be hard and ugly. If you have the option to change it a bit, things can get much easier.
Here is an example using a list declared in yaml in the following demo playbook. Data is extracted using json_query with the relevent jmespath expression (i.e. the query variable in the debug task)
---
- hosts: localhost
gather_facts: False
vars:
my_ips:
- ip: "1.2.3.4"
vlan: "900 - CLOUD-DEV"
role: "Management"
- ip: "4.5.6.7"
vlan: "901 - CLOUD-DEV"
role: "Production"
- ip: "8.9.10.11"
vlan: "902 - CLOUD-DEV"
role: "Backup"
tasks:
- name: Get ips per role
vars:
query: >-
[?role=='{{ item }}']
debug:
msg: "List of ips for role {{ item }}: {{ my_ips | json_query(query) }}"
loop:
- Management
- Production
- Backup
Which gives
PLAY [localhost] ********************************************************************************************************************************************************************************************************************************************************
TASK [Get ips per role] *************************************************************************************************************************************************************************************************************************************************
Wednesday 23 October 2019 16:14:23 +0200 (0:00:00.043) 0:00:00.043 *****
ok: [localhost] => (item=Management) => {
"msg": "List of ips for role Management: [{'ip': '1.2.3.4', 'vlan': '900 - CLOUD-DEV', 'role': 'Management'}]"
}
ok: [localhost] => (item=Production) => {
"msg": "List of ips for role Production: [{'ip': '4.5.6.7', 'vlan': '901 - CLOUD-DEV', 'role': 'Production'}]"
}
ok: [localhost] => (item=Backup) => {
"msg": "List of ips for role Backup: [{'ip': '8.9.10.11', 'vlan': '902 - CLOUD-DEV', 'role': 'Backup'}]"
}
PLAY RECAP **************************************************************************************************************************************************************************************************************************************************************
localhost : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
The equivalent variable declaration in plain json would be:
[
{
"ip": "1.2.3.4",
"vlan": "900 - CLOUD-DEV",
"role": "Management"
},
{
"ip": "4.5.6.7",
"vlan": "901 - CLOUD-DEV",
"role": "Production"
},
{
"ip": "8.9.10.11",
"vlan": "902 - CLOUD-DEV",
"role": "Backup"
}
]
If you have to load this from an external string (e.g. loading a file...), you can use the from_json filter in your playbook