在Ansible中将Python脚本的输出转换为dict [英] Converting output of Python script to dict in Ansible

问题描述

我有一个名为test.py的Python脚本，该脚本是:

I have a Python script called test.py which is:

#!/usr/bin/python
a = "A:2\nB:5"
print a

现在在我的Ansible剧本中，我正在运行此脚本，并使用此任务将输出注册到变量中

Now in my Ansible playbook, I am running this script and registering the output to a variable using this task

- name: Create variable from the command
  command: "python ./test.py"
  register: command_output

我想将输出转换为字典Dict，以便在后续任务中可以访问Dict.A或Dict.B之类的值.

I want to convert the output to a dictionary Dict in ansible so that in subsequent tasks I can access values like Dict.A or Dict.B.

我尝试了此处的所有选项，但没有一个对我有用.

I tried all the options present here but none are working for me.

在实现第一个答案时，这是我的剧本:

While implementing the first answer this is my playbook:

---
- hosts: localhost
  gather_facts: no
  become: yes
  tasks:
    - name: Create variable from command
      command: "python ./test.py"
      register: command_output

    - name: set parameter values as fact
      set_fact:
        parameter: >
          "{{ parameter | default({}) | combine ( { item.split(':')[0]: item.split(':')[1] } ) }}"
      with_items: "{{command_output.stdout_lines}}"

    - debug:
        msg: "{{parameter}}"

为此，我遇到了错误:

TASK [set parameter values as fact] **************************************************************************************************************************************************************
ok: [localhost] => (item=A:2)
fatal: [localhost]: FAILED! => {"msg": "|combine expects dictionaries, got u'\"{u\\'A\\': u\\'2\\'}\"\\n'"}

第二个答案是我写的这个脚本

For second answer I wrote this script

---
- hosts: localhost
  gather_facts: no
  become: yes
  tasks:

    - name: Create variable from command
      command: "python ./test.py"
      register: command_output


    - name: set parameter values as fact
      set_fact:
        parameter: >
          {{
            parameter | default({})|
            combine(
              dict([item.partition(':')[::2]|map('trim')])
            )
          }}
      with_items: "{{command_output.stdout_lines}}"

    - debug:
        msg: "{{parameter.B}}"

在这种情况下，我收到此错误

In this case, I am getting this error

fatal: [localhost]: FAILED! => {"msg": "Unexpected templating type error occurred on ({{ dict([item.partition(':')[::2]|map('trim')]) }}): <lambda>() takes exactly 0 arguments (1 given)"}

我不知道如何在Ansible中将python脚本的输出转换为字典.我可以从python发送输出作为列表，字符串或字典本身，但是无论如何，它在Ansible中注册为字符串，然后，我无法将其转换回Ansible中的字典.

I am clueless what I can do to convert the output of my python script to a dictionary in Ansible. I can send the output as the list, string or dictionary itself from python but in any case, it registers as a string in Ansible and after that, I am not able to convert it back to the dictionary in Ansible.

如果还有其他方法可以执行此操作，请提供帮助.我正在考虑为此编写ansible模块，但是即使在那儿，我也不确定ansible将如何处理模块的输出，因为本质上这也是一个python脚本.

If there is any other way to implement this please help. I am thinking about writing ansible module for this but even there I am not sure how will ansible handle the output of module as in essence that is also a python script.

推荐答案

说明

这是YAML解释的问题.您可以在块标量定义>之后用"显式定义一个字符串，这意味着在第一次迭代后，将parameter变量定义为字符串.

This is a problem with YAML interpretation. You explicitly define a string with " following block scalar definition > which means after the first iteration parameter variable is defined as string.

然后第二次迭代失败，因为您将该字符串传递给了combine过滤器(而不是它期望的字典).

Then the second iteration fails, because you pass that string to the combine filter (instead of a dictionary, which it expects).

解决方案

要么单行编写，要么不使用YAML块标量定义(>):

Either write this in a single line instead of using YAML block scalar definition (>):

parameter: "{{ parameter | default({}) | combine ( { item.split(':')[0]: item.split(':')[1] } ) }}"

或删除引号:

parameter: >
  {{ parameter | default({}) | combine ( { item.split(':')[0]: item.split(':')[1] } ) }}

输出:

TASK [Create variable from the command] *************************************************************************************
changed: [localhost]

TASK [set parameter values as fact] *****************************************************************************************
ok: [localhost] => (item=A:2)
ok: [localhost] => (item=B:5)

TASK [debug] ****************************************************************************************************************
ok: [localhost] => {
    "msg": {
        "A": "2",
        "B": "5"
    }
}

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