Finch.io 0.1.3

This release contains several functional improvements:

ValidationRule accepts param name in order to pass it into the exception. So, a fancy errors may be generated out the expections ParamNotFound and ValidationFailed

val params = for {
  name <- RequiredParam("name")
  _ <- ValidationRule("name", "should be longer then 5 chars") { name.length > 5 }
} yield name

val a = new Service[HttpRequest, HttpResponse] {
  def apply(req: HttpRequest) = for {
    name <- params(req)
  } yield Ok()
}

val req: HttpRequest = ???

a(req) handle {
  case e: ParamNotFound => BadRequest(s"${e.param} not found")
  case e: ValidationFailed => BadRequest(s"${e.param} is not validated: ${e.rule}")
}

Also, a Respond builder may consume HTTP headers with withHeaders method:

val ok: Respond = Ok.withHeaders("Header-A" - > "a", "Header-B" -> B)
val rep: HttpRequest = ok()

Also, a new right-hand-side operand for pipe ! operator is pure service. Services, filters and endpoints may be piped to other service like following.

Composing services:

val ab: Service[A, B] = ???
val bc: Service[B, C] = ???
val ac: Service[A, C] = ab ! bc

Composing endpoints:

val ab: Endpoint[A, B] = ???
val bc: Endpoint[B, C] = ???
val ac: Endpoint[A, C] = ab ! bc

Finally, TurnJsonIntoHttp is no longer a filter but pure service. So, it may be constructred without request type.