istio
/
istio.io
mirror of https://github.com/istio/istio.io.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Fix the table format in expression-language.md (#1396) 

Add `|` to make the table correct and use `\` to escape the `|` character inside the table. Not sure if this is the right way to fix but the preview page looks good.
This commit is contained in:
Yangmin 2018-05-31 12:33:01 -07:00 committed by Martin Taillefer
parent 61a4a6a2ec
commit e45ae989f9
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
content/docs/reference/config/policy-and-telemetry/expression-language.md
View File

@ -21,14 +21,14 @@ CEXL accepts a subset of **[Go expressions](https://golang.org/ref/spec#Expressi
CEXL supports the following functions.
|Operator/Function |Definition |Example | Description
|-----------------------------------------
|Operator/Function |Definition |Example | Description|
|------------------|-----------|--------|------------|
|`==` |Equals |`request.size == 200`
|`!=` |Not Equals |`request.auth.principal != "admin"`
|`||` |Logical OR | `(request.size == 200) || (request.auth.principal == "admin")`
|`\|\|` |Logical OR | `(request.size == 200) \|\| (request.auth.principal == "admin")`
|`&&` |Logical AND | `(request.size == 200) && (request.auth.principal == "admin")`
|`[ ]` |Map Access | `request.headers["x-id"]`
|`|` |First non empty | `source.labels["app"] | source.labels["svc"] | "unknown"`
|`\|` |First non empty | `source.labels["app"] \| source.labels["svc"] \| "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.
|`dnsName` | Convert a textual DNS name into the `DNS_NAME` type | `dnsName("www.istio.io")` | Use the `dnsName` function to create a `DNS_NAME` literal.
@ -56,10 +56,10 @@ For example, the expression `request.auth.principal == "user1"` fails evaluation
## Examples
|Expression |Return Type |Description
|------------------------------------
|`request.size| 200` | **int** | `request.size` if available, otherwise 200.
|Expression |Return Type |Description|
|-----------|------------|-----------|
|`request.size \| 200` | **int** | `request.size` if available, otherwise 200.
|`request.headers["X-FORWARDED-HOST"] == "myhost"`| **boolean**
|`(request.headers["x-user-group"] == "admin") || (request.auth.principal == "admin")`| **boolean**| True if the user is admin or in the admin group.
|`(request.auth.principal | "nobody" ) == "user1"` | **boolean** | True if `request.auth.principal` is "user1", The expression will not error out if `request.auth.principal` is missing.
|`(request.headers["x-user-group"] == "admin") \|\| (request.auth.principal == "admin")`| **boolean**| True if the user is admin or in the admin group.
|`(request.auth.principal \| "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.