/*
* Copyright 2018-2020 ProfunKtor
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dev.profunktor.tracer
import cats.Monad
import cats.data.{Kleisli, OptionT}
import cats.syntax.flatMap._
import cats.syntax.functor._
import dev.profunktor.tracer.Tracer.TraceId
import org.http4s.{HttpRoutes, Request, Response}
object TracedHttpRoute {
case class TracedRequest[F[_]](traceId: TraceId, request: Request[F])
def apply[F[_]: Monad: Tracer](
pf: PartialFunction[TracedRequest[F], F[Response[F]]]
): HttpRoutes[F] =
Kleisli[OptionT[F, ?], Request[F], Response[F]] { req =>
OptionT {
Tracer[F]
.getTraceId(req)
.map(x => TracedRequest[F](x.getOrElse(TraceId("-")), req))
.flatMap { tr =>
val rs: OptionT[F, Response[F]] = pf.andThen(OptionT.liftF(_)).applyOrElse(tr, Function.const(OptionT.none))
rs.value
}
}
}
}
