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add new expressions (#3363)

This commit is contained in:
Pengyuan Bian 2019-02-25 07:07:30 -08:00 committed by istio-bot
parent ea846f8d04
commit ccd58553f8
1 changed files with 5 additions and 0 deletions
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content/docs/reference/config/policy-and-telemetry/expression-language/index.md
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@ -29,6 +29,10 @@ CEXL supports the following functions.
|`&&` |Logical AND | `(request.size == 200) && (request.auth.principal == "admin")`
|`[ ]` |Map Access | `request.headers["x-request-id"]`
|`+` |Add | `request.host + request.path`
|`>` |Greater Than | `response.code > 200`
|`>=` |Greater Than or Equal to | `request.size >= 100`
|`<` |Less Than | `response.code < 500`
|`<=` |Less Than or Equal to | `request.size <= 100`
|<code>&#124;</code> |First non empty | `source.labels["app"]` <code>&#124;</code> `source.labels["svc"]` <code>&#124;</code> `"unknown"`
|`match` | Glob match |`match(destination.service, "*.ns1.svc.cluster.local")` | Matches prefix or suffix based on the location of `*`
|`email` | Convert a textual e-mail into the `EMAIL_ADDRESS` type | `email("awesome@istio.io")` | Use the `email` function to create an `EMAIL_ADDRESS` literal.
@ -42,6 +46,7 @@ CEXL supports the following functions.
|`emptyStringMap` | Create an empty string map | `request.headers` <code>&#124;</code> `emptyStringMap()`| Use `emptyStringMap` to create an empty string map for default value of `request.headers`.
|`conditional` | Simulate ternary operator | `conditional((context.reporter.kind` <code>&#124;</code> `"inbound") == "outbound", "client", "server")` | Returns `"client"` if report kind is `outbound` otherwise returns `"server"`.
|`toLower` | Convert a string to lowercase letters | `toLower("User-Agent")` | Returns `"user-agent"`.
|`size` | Length of a string | `size("admin")` | Returns 5
## Type checking