JMESPath 响应过滤

Question

当 lldp-remote-system-name 包含 slc1.

时，我尝试过滤以获得 lldp-remote-system-name

但我收到错误：

Error in jmespath.search in json_query filter plugin:\n'in ' requires string as left operand, not NoneType

任务：

- name: get system information
  juniper_junos_rpc:
    rpc: get-lldp-neighbors-information
  register: response

- name: Get remote system name
  set_fact:
    lldp_interface: "{{ response.parsed_output | to_json | from_json | json_query(interface) }}"
  vars:
    interface: '"lldp-neighbors-information"."lldp-neighbor-information"[?contains("lldp-remote-system-name","slc1")]."lldp-remote-system-name"'

- name: Print response
  debug:
    msg: 
        - "{{ lldp_interface }}"

回应

{
    "lldp-neighbors-information": {
        "lldp-neighbor-information": [
            {
                "lldp-local-parent-interface-name": "ae1",
                "lldp-local-port-id": "et-0/0/50",
                "lldp-remote-chassis-id": "22:22:22:22:22:22",
                "lldp-remote-chassis-id-subtype": "Mac address",
                "lldp-remote-port-description": "las1-router-1:et-0/0/50",
                "lldp-remote-system-name": "las1-router-1"
            },
            {
                "lldp-local-parent-interface-name": "ae0",
                "lldp-local-port-id": "xe-0/0/1",
                "lldp-remote-chassis-id": "11:11:11:11:11:11",
                "lldp-remote-chassis-id-subtype": "Mac address",
                "lldp-remote-port-description": "slc1-router-1-xe-0/0/1",
                "lldp-remote-system-name": "slc1-router-1"
            }
        ]
    }
}

Answer 1

无需使用jmepath:

- name: testplaybook jinja2
  hosts: localhost
  gather_facts: no
  vars:
    response:
      lldp-neighbors-information:
        lldp-neighbor-information:
        - lldp-local-parent-interface-name: ae1
          lldp-local-port-id: et-0/0/50
          lldp-remote-chassis-id: 22:22:22:22:22:22
          lldp-remote-chassis-id-subtype: Mac address
          lldp-remote-port-description: las1-router-1:et-0/0/50
          lldp-remote-system-name: las1-router-1
        - lldp-local-parent-interface-name: ae0
          lldp-local-port-id: xe-0/0/1
          lldp-remote-chassis-id: 11:11:11:11:11:11
          lldp-remote-chassis-id-subtype: Mac address
          lldp-remote-port-description: slc1-router-1-xe-0/0/1
          lldp-remote-system-name: slc1-router-1
  tasks:

    - name: Disp 
      debug: 
        msg: "{{ item['lldp-remote-system-name'] }}"
      loop: "{{ response['lldp-neighbors-information']['lldp-neighbor-information'] }}"
      loop_control:
        label: "interface name: {{ item['lldp-local-parent-interface-name'] }}"
      when: "'slc1' in item['lldp-remote-system-name']"

结果：

skipping: [localhost] => (item=interface name: ae1) 
ok: [localhost] => (item=interface name: ae0) => {
    "msg": "slc1-router-1"
}

Answer 2

在 JMESPath 中，双引号不是字符串分隔符，它们有一个特定的用途：它们分隔具有特殊字符的标识符：

An identifier can also be quoted. This is necessary when an identifier has characters not specified in the unquoted-string grammar rule. In this situation, an identifier is specified with a double quote, followed by any number of unescaped-char or escaped-char characters, followed by a double quote.

^{来源：https://jmespath.org/specification.html#identifiers}

如果您想要 raw string littoral，请改用反引号：`.

因此，您的 JMESPath 查询应该是 — 分成多行以使其更具可读性：

interface: >-
  "lldp-neighbors-information"
  ."lldp-neighbor-information"[?
    contains("lldp-remote-system-name",`slc1`)
  ]
  ."lldp-remote-system-name"

给定任务：

- debug:
    msg: "{{ json | json_query(interface) }}"
  vars:
    interface: >-
      "lldp-neighbors-information"
      ."lldp-neighbor-information"[?
        contains("lldp-remote-system-name",`slc1`)
      ]
      ."lldp-remote-system-name"
    json:
      lldp-neighbors-information:
        lldp-neighbor-information:
          - lldp-local-parent-interface-name: ae1
            lldp-local-port-id: et-0/0/50
            lldp-remote-chassis-id: 22:22:22:22:22:22
            lldp-remote-chassis-id-subtype: Mac address
            lldp-remote-port-description: las1-router-1:et-0/0/50
            lldp-remote-system-name: las1-router-1
          - lldp-local-parent-interface-name: ae0
            lldp-local-port-id: xe-0/0/1
            lldp-remote-chassis-id: 11:11:11:11:11:11
            lldp-remote-chassis-id-subtype: Mac address
            lldp-remote-port-description: slc1-router-1-xe-0/0/1
            lldp-remote-system-name: slc1-router-1

这产生：

ok: [localhost] => 
  msg:
  - slc1-router-1

JMESPath 响应过滤

JMESPath filtering on response

ansible

jmespath