JSONPath模板是由{}大括号括起来的JSONPath表达式组成。除了原始的JSONPath语法之外,我们还添加了三个函数:
- 可选的$操作符,因为表达式总是默认从根对象开始。
- 用""双引号来引用JSONPath表达式中的文本
- 使用range操作符来迭代List。
result对象被打印成String()函数。
输出结果:
{ "kind": "List", "items":[ { "kind":"None", "metadata":{"name":"127.0.0.1"}, "status":{ "capacity":{"cpu":"4"}, "addresses":[{"type": "LegacyHostIP", "address":"127.0.0.1"}] } }, { "kind":"None", "metadata":{"name":"127.0.0.2"}, "status":{ "capacity":{"cpu":"8"}, "addresses":[ {"type": "LegacyHostIP", "address":"127.0.0.2"}, {"type": "another", "address":"127.0.0.3"} ] } } ], "users":[ { "name": "myself", "user": {} }, { "name": "e2e", "user": {"username": "admin", "password": "secret"} } ] }
Function | Description | Example | Result |
text | the plain text | kind is {.kind} | kind is List |
@ | the current object | {@} | the same as input |
. or [] | child operator | {.kind} or {[‘kind’]} | List |
.. | recursive descent | {..name} | 127.0.0.1 127.0.0.2 myself e2e |
* | wildcard. Get all objects | {.items[*].metadata.name} | [127.0.0.1 127.0.0.2] |
[start:end :step] | subscript operator | {.users[0].name} | myself |
[,] | union operator | {.items[*][‘metadata.name’, ‘status.capacity’]} | 127.0.0.1 127.0.0.2 map[cpu:4] map[cpu:8] |
?() | filter | {.users[?(@.name==”e2e”)].user.password} | secret |
range, end | iterate list | {range .items[*]}[{.metadata.name}, {.status.capacity}] {end} | [127.0.0.1, map[cpu:4]] [127.0.0.2, map[cpu:8]] |
”” | quote interpreted string | {range .items[*]}{.metadata.name}{“\t”}{end} | 127.0.0.1 127.0.0.2 |
《Kubernetes JSONpath Support》有16个想法