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Add two expressions. (#1840)

This commit is contained in:
Pengyuan Bian 2018-07-18 04:41:19 -07:00 committed by Martin Taillefer
parent 6cfbccc9b5
commit 82685030a4
1 changed files with 3 additions and 1 deletions
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4
content/docs/reference/config/policy-and-telemetry/expression-language/index.md
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@ -38,6 +38,8 @@ CEXL supports the following functions.
|`.matches` | Regular expression match | `"svc.*".matches(destination.service)` | Matches `destination.service` against regular expression pattern `"svc.*"`.
|`.startsWith` | string prefix match | `destination.service.startsWith("acme")` | Checks whether `destination.service` starts with `"acme"`.
|`.endsWith` | string postfix match | `destination.service.endsWith("acme")` | Checks whether `destination.service` ends with `"acme"`.
|`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"`.
## Type checking
@ -60,6 +62,6 @@ For example, the expression `request.auth.principal == "user1"` fails evaluation
|-----------|------------|-----------|
|`request.size` <code>&#124; 200</code> | **int** | `request.size` if available, otherwise 200.
|`request.headers["X-FORWARDED-HOST"] == "myhost"`| **boolean**
|`(request.headers["x-user-group"] == "admin") <code>&#124;&#124;</code> (request.auth.principal == "admin")`| **boolean**| True if the user is admin or in the admin group.
|`(request.headers["x-user-group"] == "admin")` <code>&#124;&#124;</code> `(request.auth.principal == "admin")`| **boolean**| True if the user is admin or in the admin group.
|`(request.auth.principal` <code>&#124;</code> `"nobody" ) == "user1"` | **boolean** | True if `request.auth.principal` is "user1", The expression will not error out if `request.auth.principal` is missing.
|`source.labels["app"]=="reviews" && source.labels["version"]=="v3"`| **boolean** | True if app label is reviews and version label is v3, false otherwise.