CODEWITHSUNDEEP
scalaakka-http
xohzzwn6kcj9
xohzzwn6kcj9

Reputation: 35

akka-http custom PathMatcher

Many of directives (e.g., parameters) gives very convenient unmarshalling mechanism.

But I failed to find similar DSL for the Path Matcher from the documentation. I thought that given proper Unmarshaller, I would something like below,

implicit val userStatusUnmarshaller: FromStringUnmarshaller[UserStatus] = ???
val route = path("user" / Segment.as[UserStatus]) { status: UserStatus => 
    ...
}

expecially when the custom unmarshalling result is Enumeration.

Do they give such a way but I couldn't find or is there another way to do the same thing?

Upvotes: 0

Views: 1069

Answers (2)

Federico Pellegatta
Federico Pellegatta

Reputation: 4017

What about implicitly extend PathMatcher1[String] asking for something String => Option[T].

implicit class PimpedSegment(segment: PathMatcher1[String]) {
  def as[T](implicit asT: String => Option[T]): PathMatcher1[T] =
    segment.flatMap(asT)
}

For example you could implicitly require a JsonReader[T]:

implicit class JsonSegment(segment: PathMatcher1[String]) {
  def as[T: JsonReader]: PathMatcher1[T] = segment.flatMap { string =>
    Try(JsString(string).convertTo[T]).toOption
  }
}

Then it can be used as Segment.as[UserStatus].

Upvotes: 3

Tomasz Perek
Tomasz Perek

Reputation: 409

You can flatMap segment to UserStatus like so:

    Segment.flatMap(UserStatus.fromString)

fromString should return Option[UserStatus]

Upvotes: 6

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