在Ansible中讀取時如何處理JSON陣列中缺少的鍵

下面是我的 JSON 檔案：

[
  {
    "?xml": {
      "attributes": {
        "encoding": "UTF-8",
        "version": "1.0"
      }
    }
  },
  {
    "domain": [
      {
        "name": "mydom"
      },
      {
        "domain-version": "12.2.1.3.0"
      },
      {
        "server": [
          {
            "name": "AdminServer"
          },
          {
            "ssl": {
              "name": "AdminServer"
            }
          },
          {
            "listen-port": "12400"
          },
          {
            "listen-address": "mydom.host1.bank.com"
          }
        ]
      },
      {
        "server": [
          {
            "name": "myserv1"
          },
          {
            "ssl": [
              {
                "name": "myserv1"
              },
              {
                "login-timeout-millis": "25000"
              }
            ]
          },
          {
            "log": [
              {
                "name": "myserv1"
              },
              {
                "file-name": "/web/bea_logs/domains/mydom/myserv1/myserv1.log"
              }
            ]
          }
        ]
      },
      {
        "server": [
          {
            "name": "myserv2"
          },
          {
            "ssl": {
              "name": "myserv2"
            }
          },
         {
           "reverse-dns-allowed": "false"
         },
          {
            "log": [
              {
                "name": "myserv2"
              },
              {
                "file-name": "/web/bea_logs/domains/mydom/myserv2/myserv2.log"
              }
            ]
          }
        ]
      }
    ]
  }
]

我需要使用 ansible 代碼獲取日志串列name，file-name如下所示。

myserv1_log: "/web/bea_logs/domains/mydom/myserv1/myserv1.log"
myserv2_log: "/web/bea_logs/domains/mydom/myserv2/myserv2.log"

我面臨兩個挑戰。

1. server可能并不總是domain陣列的第三個鍵。
2. log陣列可能并不總是所有server陣列的鍵，因此不應列印。例如。server名稱 AdminServer 沒有任何log串列，而 myserv1 和 myserv2 有。

我需要一個 ansible 代碼來列印動態變化的 json 所需的代碼。

注意：server將始終是domain陣列中的鍵

我在這里發布參考我的類似查詢：無法理想地決議 ansible 中的 json 檔案

請建議。

uj5u.com熱心網友回復：

您只需測驗兩個鍵是否存在：

- hosts: localhost
  gather_facts: no
  vars:
    json: "{{ lookup('file', './file.json') | from_json }}"
  tasks:
    - name: display
      debug:
        msg: "name: {{ servername }} --> filename: {{ filename }}"
      loop: "{{ json[1].domain }}"
      vars:
        servername: "{{ item.server.0.name }}_log"
        filename: "{{ item['server'][2]['log'][1]['file-name'] }}"
      when: item.server is defined and item.server.2.log is defined

結果：

TASK [display] 
skipping: [localhost] => (item={'name': 'USWL1212MRSHM01'}) 
skipping: [localhost] => (item={'domain-version': '12.2.1.3.0'}) 
skipping: [localhost] => (item={'server': [{'name': 'AdminServer'}, {'ssl': {'name': 'AdminServer'}}, {'listen-port': '12400'}, {'listen-address': 'myhost1'}]}) 
ok: [localhost] => (item={'server': [{'name': 'myserv1'}, {'ssl': {'name': 'myserv1'}}, {'log': [{'name': 'myserv1'}, {'file-name': '/web/bea_logs/domains/mydom/myserv1/myserv1.log'}]}]}) => {
    "msg": "name: myserv1_log --> filename: /web/bea_logs/domains/mydom/myserv1/myserv1.log"
}
ok: [localhost] => (item={'server': [{'name': 'myserv2'}, {'ssl': {'name': 'myserv2'}}, {'log': [{'name': 'myserv2'}, {'file-name': '/web/bea_logs/domains/mydom/myserv2/myserv2.log'}]}]}) => {
    "msg": "name: myserv2_log --> filename: /web/bea_logs/domains/mydom/myserv2/myserv2.log"
}

如您所見，當條件不成立時，將跳過該操作...

您可以通過僅測驗 key 來簡化log，因為在您的情況下， keylog始終鏈接到 keyserver

when: item.server.2.log is defined   

uj5u.com熱心網友回復：

鑒于資料

mydata:
  - ?xml:
      attributes:
        encoding: UTF-8
        version: '1.0'
  - domain:
    - name: USWL1212MRSHM01
    - domain-version: 12.2.1.3.0
    - server:
      - name: AdminServer
      - ssl:
          name: AdminServer
      - listen-port: '12400'
      - listen-address: myhost1
    - server:
      - name: myserv1
      - ssl:
          name: myserv1
      - log:
        - name: myserv1
        - file-name: /web/bea_logs/domains/mydom/myserv1/myserv1.log
    - server:
      - name: myserv2
      - ssl:
          name: myserv2
      - log:
        - name: myserv2
        - file-name: /web/bea_logs/domains/mydom/myserv2/myserv2.log

使用json_query選擇屬性日志

_logs: "{{ mydata|json_query(_query) }}"
_query: '[].domain[][].server[].log'

給

_logs:
  - - name: myserv1
    - file-name: /web/bea_logs/domains/mydom/myserv1/myserv1.log
  - - name: myserv2
    - file-name: /web/bea_logs/domains/mydom/myserv2/myserv2.log

接下來，組合專案并使用items2dict創建字典

logs_dict: "{{ _logs|map('combine')|list|
                     items2dict(key_name='name', value_name='file-name') }}"

給出預期的結果

logs_dict:
  myserv1: /web/bea_logs/domains/mydom/myserv1/myserv1.log
  myserv2: /web/bea_logs/domains/mydom/myserv2/myserv2.log

- hosts: localhost
  vars:
    mydata: "{{ lookup('file', 'test-658-data.yml')|from_yaml }}"
    _logs: "{{ mydata|json_query(_query) }}"
    _query: '[].domain[][].server[].log'
    logs_dict: "{{ _logs|map('combine')|list|
                         items2dict(key_name='name', value_name='file-name') }}"
  tasks:
    - debug:
        var: logs_dict

mydata: "{{ lookup('file', 'test-658-data.yml')|from_yaml }}"
_logs: "{{ mydata|json_query(_query) }}"
_query: '[].domain[][].server'
_arr: "{{ _logs|map('combine')|
                selectattr('name', 'defined')|
                selectattr('log', 'defined') }}"
_names: "{{ _arr|map(attribute='name')|list }}"
_files: "{{ _arr|map(attribute='log.1.file-name')|list }}"
logs_dict: "{{ dict(_names|zip(_files)) }}"

標籤：json 数组列表 动态的 可靠的 钥匙

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