响应上的JMESPath筛选

Question

当lldp-remote-system-name包含slc1时，我尝试过滤以获得lldp-remote-system-name。

但我得到了错误：

json_query筛选器插件中jmespath.search中的错误："in"需要字符串作为左操作数，而不是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 }}"

响应

{
"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

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

标识符也可以被引用。当标识符包含unquoted-string grammar规则中未指定的字符时，这是必要的。在这种情况下，标识符用双引号指定，后跟任意数量的unescaped-char或escaped-char字符，后跟双引号。

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

如果你想有一个沿海的原始字符串，请使用反勾号：`。

因此，您的JMESPath查询应该在多行上拆分，以使其更可读：

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

Answer 2

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"
}