是否可以使用Jinja/Ansible映射多个属性？

Question

我想构建一个输出,显示变量的键和值.

以下工作完美......

# Format in Ansible

msg="{{ php_command_result.results | map(attribute='item') | join(', ') }}"

# Output
{'value': {'svn_tag': '20150703r1_6.36_homeland'}, 'key': 'ui'}, {'value': {'svn_tag': '20150702r1_6.36_homeland'}, 'key': 'api'}

我想要的是如此展示key和svn_tag一起:

我能够显示无论是key或svn_tag,但让他们走在一起也不行.

msg="{{ php_command_result.results | map(attribute='item.key') | join(', ') }}"

# Output
ui, api

但是,这就是我想要的.

# Desired Output
api - 20150702r1_6.36_homeland
ui - 20150703r1_6.36_homeland

Answer 1

使用Jinja语句:

- set_fact:
    php_command_result:
      results: [{"value":{"svn_tag":"20150703r1_6.36_homeland"},"key":"ui"},{"value":{"svn_tag":"20150702r1_6.36_homeland"},"key":"api"}]

- debug:
    msg: "{% for result in php_command_result.results %}\
        {{ result.key }} - {{ result.value.svn_tag }} |
      {% endfor %}"

输出:

ok: [localhost] => {
    "msg": "ui - 20150703r1_6.36_homeland | api - 20150702r1_6.36_homeland | "
}

如果您希望结果分开:

- debug:
    msg: "{% set output = [] %}\
        {% for result in php_command_result.results %}\
          {{ output.append( result.key ~ ' - ' ~ result.value.svn_tag) }}\
        {% endfor %}\
      {{ output }}"

输出:

ok: [localhost] => {
    "msg": [
        "ui - 20150703r1_6.36_homeland", 
        "api - 20150702r1_6.36_homeland"
    ]
}

如果需要,可以将这些中的任何一个放在一行上:

- debug:
    msg: "{% for result in php_command_result.results %}{{ result.key }} - {{ result.value.svn_tag }} | {% endfor %}"

- debug:
    msg: "{% set output = [] %}{% for result in php_command_result.results %}{{ output.append( result.key ~ ' - ' ~ result.value.svn_tag) }}{% endfor %}{{ output }}"

Answer 2

当我搜索处理类似任务的方法时，我发现了这个问题，但我希望输出是另一个包含各个元素的 JSON 列表。我花了很多注意力map，filter甚至 Jinja2for循环，所以我也将在这里发布答案。只需创建以下文件并通过以下方式运行ansible-playbook：

- hosts: localhost
  connection: local
  vars:
    to_test: [ {'value': {'svn_tag': '20150703r1_6.36_homeland'}, 'key': 'ui'}, {'value': {'svn_tag': '20150702r1_6.36_homeland'}, 'key': 'api'} ]
  tasks:
  - debug:
      msg: "to_test: {{ to_test }}"
  - debug:
      msg: "to_test reduced: {{ to_test | json_query('[].{key: key, svn_tag: value.svn_tag}') | list }}"
  - debug:
      msg: "to_test reduced: {{ to_test | json_query(query1) | list }}"
    vars:
      query1: "[].{key: key, svn_tag: value.svn_tag}"

最终结果是一个漂亮的 JSON 数组：

[{'key': 'ui', 'svn_tag': '20150703r1_6.36_homeland'}, {'key': 'api', 'svn_tag': '20150702r1_6.36_homeland'}]"

Answer 3

您可以使用以下技术来做到这一点：

1. 创建filter_plugin. 添加filter_plugins = <path to the folder>ansible.cfg。然后创建一个文件说my_plugin.py：

   class FilterModule(object):
   ''' Custom filter '''
       def filters(self, my_arg):
          return <parse it here......>
   

例子：

剧本.yml

---
- hosts: localhost
  gather_facts: no
  connection: local
  tasks:
    - set_fact: 
        php_command_result:
          results: {'value': {'svn_tag': '20150703r1_6.36_homeland'}, 'key': 'ui'}
    - debug: msg="Hey look what I got '{{ php_command_result.results | a }}'"

my_plugin.py

import json

class FilterModule(object):
    def filters(self):
      return {'a': a}

def a(a):
  r = '%s - %s' % (a['key'], a['value']['svn_tag'])
  return r

2. 快速简便的方法：只需使用模块python/php/shell或您喜欢的任何shell模块。像这样的东西：

   - name: Pars output
     shell: python -c "import json; json.loads('{{ php_command_result.results }}') ....
   

Answer 4

这是没有自定义 filter_plugin 或运行 shell 命令的解决方案。但是，它需要在 with_items 循环（php_fmt）中设置额外的事实。

- hosts: localhost
  connection: local
  gather_facts: false 
  tasks:
    - set_fact: 
        php_command_result:
          results: '[{"value":{"svn_tag":"20150703r1_6.36_homeland"},"key":"ui"},{"value":{"svn_tag":"20150702r1_6.36_homeland"},"key":"api"}]'

    - set_fact:
        php_fmt: "{{ php_fmt|default([])|union([item.key+' -- '+item.value.svn_tag ]) }}"
      with_items: "{{ php_command_result.results }}"

    - debug: 
        msg: "{{php_fmt|join(',')}}"

Answer 5

这是filter_plugins我发现非常易于使用的另一个答案。

如果有人仍然需要这个，您可以使用以下代码（放入 playbooks/filter_plugins/mapattributes.py）：

#!/usr/bin/env python
class FilterModule(object):
  def filters(self):
    return { 'mapattributes': self.mapattributes }

  def mapattributes(self, list_of_dicts, list_of_keys):
    l = []
    for di in list_of_dicts:
      newdi = { }
      for key in list_of_keys:
        # newdi[key] = di[key]
        if di.get(key, None) != None:
          newdi[key] = di[key]

      l.append(newdi)
    return l

假设你有这个列表，你只需要从中输入：

    INTERFACES:
      - { name: GigabitEthernet1/0/24 , enabled: yes, state: up , description: FRONT }
      - { name: GigabitEthernet1/0/9  , enabled: yes, state: up , description: BACK  }

让我们创建另一个只过滤需要的变量 key:values

    test: "{{ INTERFACES | mapattributes(['name', 'description']) }}"

测试输出

    - debug:
        var: test

ok: [R1] => {
    "test": [
        {
            "description": "FRONT",
            "name": "GigabitEthernet1/0/24"
        },
        {
            "description": "BACK",
            "name": "GigabitEthernet1/0/9"
        }
    ]
}

这让我有一个大字典，只切片我需要传递给的键 ios_interface/aggregate

感谢 Nee6ione，我在托盘/jinja github问题上找到了它