如何在Ansible中獲取具有動態變化位置的Json陣列元素

下面是我的 json 檔案，其中我在log陣列內部server有domain陣列。

[
  {
    "?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"
              }
            ]
          }
        ]
      }
    ]
  }
]

log陣列內部陣列的位置server可能會發生變化，如上面的 json 所示。

我希望獲取如下輸出：

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. logarray 可能并不總是所有服務器陣列的鍵，因此不應列印。例如。服務器名稱 AdminServer 沒有任何日志串列，而 myserv1 和 myserv2 有。

此外，log如果存在，可能并不總是server陣列的第二個鍵，如 json 中所示。

當 log 始終是serveraarray 的第二個元素時，提供了一種解決方案，如下所示：

- 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

請建議。

uj5u.com熱心網友回復：

你有很多解決方案可以做到這一點，一個：

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

結果：

skipping: [localhost] => (item={'name': 'mydom'}) 
skipping: [localhost] => (item={'domain-version': '12.2.1.3.0'}) 
skipping: [localhost] => (item={'server': [{'name': 'AdminServer'}, {'ssl': {'name': 'AdminServer'}}, {'listen-port': '12400'}, {'listen-address': 'mydom.host1.bank.com'}]}) 
ok: [localhost] => (item={'server': [{'name': 'myserv1'}, {'ssl': [{'name': 'myserv1'}, {'login-timeout-millis': '25000'}]}, {'log': [{'name': 'myserv1'}, {'file-name': '/web/bea_logs/domains/mydom/myserv1/myserv1.log'}]}]}) => {
    "msg": "myserv1 -> /web/bea_logs/domains/mydom/myserv1/myserv1.log"
}
ok: [localhost] => (item={'server': [{'name': 'myserv2'}, {'ssl': {'name': 'myserv2'}}, {'reverse-dns-allowed': 'false'}, {'log': [{'name': 'myserv2'}, {'file-name': '/web/bea_logs/domains/mydom/myserv2/myserv2.log'}]}]}) => {
    "msg": "myserv2 -> /web/bea_logs/domains/mydom/myserv2/myserv2.log"
}

盡管你的問題，試試這個另一種解決方案：

- hosts: localhost
  gather_facts: no
  vars:
    json: "{{ lookup('file', './file.json') | from_json }}"
  tasks:
    - name: display
      set_fact:
        values: "{{ values | d([])   [v] }}"
      loop: "{{ json[1].domain }}"
      vars:
        v: >-
          {%- set dico = (item | dict2items).0.value -%}
          {%- set result = {} -%}
          {%- for i in dico -%}
          {%- for x in i if x in ["name", "log"] -%}
          {%- if result.update({x: i[x]}) -%}{% endif -%}
          {%- endfor -%}
          {%- endfor -%}
          {%- if 'log' in result %}{{ result }}{% endif -%}
      when: item.server is defined and v != ''
    
    - debug:
        msg: "{{ item.name }} -> {{ item.log[1]['file-name'] }}"
      loop: "{{ values }}"

標籤：数组 json 解析 可靠的 元素

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