如何解决 Ansible 的 url 分页循环问题？

Question

I need to send a URL query and return the JSON result, then read IP, username, password and use it as host.

And the first step of my problem is that there are multiple pages when I send a URL query and I will save the server information on all these pages as a host, then save the information from these pages as a host, access these servers, and update them.

URL - http://apilink/virtual-machines

page results JSON

"meta": {
        "pagination": {
            "count": 16, 
            "current_page": 1, 
            "links": {
                "next": "http://apilink/virtual-machines?page=2"
            }, 
            "per_page": 16, 
            "total": 169, 
            "total_pages": 11
        }
    }

I will continue to query with the next URL and I have to write the results on all returned pages as hosts.

"json": {
    "data": [
         {
            "actual_mhz": 0, 
            "connectionParameters": {
                "data": [
                    {
                        "description": "Secure Shell", 
                        "ip_addr": "192.168.1.1", 
                        "port": 22, 
                        "protocol": "SSH"
                    }
                ]
            },  
            "hostname": "hostnameserver1", 
            "name": "server1", 
            "os": null, 
            "password": "xXxXxXxXX", 
            "status": "running", 
            "username": "root", 
         [
    },

From the result returned like this, I will use IP, username, password as host, access these hosts with the next task, and run the system update command.

Answer 1

In this case, I would do a first API call, just to grab the meta.pagination.total_pages , then based on this value, I would use a couple loop and range , which is the replacement of the with_sequence .

Then what you have to know is that when you register the result of a command, you can access the result of the previous items from the variable already.
There is only something to understand, this is the fact that Ansible is creating results in a very peculiar way:

1. The items are registered as if you where using no loop at all, and you can reference the previous element via your registered variable.
2. When you exist the loop, then the results key is created in the dictionary and then populated from all the results.

Something like:

- hosts: localhost
  gather_facts: no
      
  tasks:
    - uri:
        url: https://example.org/virtual-machines
      register: number_of_pages

    - uri: 
        url: >-
          {{ 
             api_call.json.meta.pagination.links.next 
             if api_call is defined else 'https://example.org/virtual-machines'
          }}
      loop: "{{ range(number_of_pages.json.meta.pagination.total_pages) }}"
      register: api_call

    - debug: 
        msg: "{{ api_call }}"