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https://issues.apache.org/jira/browse/TS-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yunkai Zhang updated TS-2364:
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Attachment: 0001-TS-2364-Introduce-slice-notation-to-field-syntax-in-.patch
> Introduce slice notation to field syntax in log format
> ------------------------------------------------------
>
> Key: TS-2364
> URL: https://issues.apache.org/jira/browse/TS-2364
> Project: Traffic Server
> Issue Type: New Feature
> Components: Logging
> Reporter: Yunkai Zhang
> Assignee: Yunkai Zhang
> Fix For: 4.2.0
>
> Attachments:
> 0001-TS-2364-Introduce-slice-notation-to-field-syntax-in-.patch
>
>
> Now, we have two kind of field syntax in log format:
> {code}
> (1) simple; syntax: '%<field>', for example: %<cqu>
> (2) container field, syntax '%<{field}container>', for example:
> %<{Referer}cqh>.
> {code}
> I'm going to introduce slice notation, so that we can easy to limit the
> length of filed's output. With slice notation, the filed syntax will looks
> like:
> {code}
> (1) '%<field[start:end]>'
> (2) '%<{field}container[start:end]>'
> {code}
> In both forms, slice notation can be omitted, which means the whole field.
> But with one limitation: slice notation makes sense only when the field is
> string type and it shouldn't be ip/timestamp which are converted to string
> from integer.
> We can see the syntax of slice notation from Python, Golang, it's pretty
> simple:
> {code}
> [start:end] //items start through end-1
> [start:] //items start through the rest of the array
> [:end] //items from the beginning through end-1
> [:] //the whole array(by default)
> {code}
> For example,
> {code}
> '%<cqh>' //the whole characters of <cqh>.
> '%<cqh>[:]' //the whole characters of <cqh>.
> '%<cqh[0:30]>' //the first 30 characters of <cqh>.
> '%<cqh[-10:]>' //the last 10 characters of <cqh>.
> '%<cqh[:-5]>' //everything except the last 5 characters of <cqh>.
> {code}
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