object MetricsOps
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- MetricsOps.scala
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def
classifierFMethodWithOptionallyExcludedPath[F[_]](exclude: (String) ⇒ Boolean, excludedValue: String = "*", pathSeparator: String = "_"): (Request[F]) ⇒ Option[String]
Given an exclude function, return a 'classifier' function, i.e.
Given an exclude function, return a 'classifier' function, i.e. for application in org.http4s.server/client.middleware.Metrics#apply.
Let's say you want a classifier that excludes integers since your paths consist of: * GET /users/{integer} = GET_users_* * POST /users = POST_users * PUT /users/{integer} = PUT_users_* * DELETE /users/{integer} = DELETE_users_*
In such a case, we could use:
classifierFMethodWithOptionallyExcludedPath( exclude = { str: String => scala.util.Try(str.toInt).isSuccess }, excludedValue = "*", intercalateValue = "_" )
Chris Davenport notes the following on performance considerations of exclude's function value:
> It's worth noting that this runs on every segment of a path. So note that if an intermediate Throwables with > Stack traces is known and discarded, there may be a performance penalty, such as the above example with Try(str.toInt). > I benchmarked some approaches and regex matches should generally be preferred over Throwable's > in this position.
- exclude
For a given String, namely a path value, determine whether the value gets excluded.
- excludedValue
Indicates the String value to be supplied for an excluded path's field.
- pathSeparator
Value to use for separating the metrics fields' values
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Request[F] => Option[String]
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