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Http4s simple integration #100

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merged 4 commits into from
Dec 2, 2019
Merged

Http4s simple integration #100

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a465f8b
Http4s simple integration
fokot Nov 29, 2019
daa38d5
Http4s simple integration scalafmt fix
fokot Nov 29, 2019
27c71f4
added executeRequestF
fokot Dec 1, 2019
ff5799e
moved code to executeToJson
fokot Dec 2, 2019
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38 changes: 34 additions & 4 deletions http4s/src/main/scala/caliban/Http4sAdapter.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ package caliban

import caliban.ResponseValue._
import caliban.Value._
import cats.data.OptionT
import cats.data.{ Kleisli, OptionT }
import cats.effect.Effect
import cats.effect.syntax.all._
import cats.~>
Expand Down Expand Up @@ -80,21 +80,38 @@ object Http4sAdapter {
): URIO[R, GraphQLResponse[E]] =
interpreter.execute(query.query, query.operationName, query.variables.map(jsonToVariables).getOrElse(Map()))

private def executeToJson[R, Q, M, S, E](
interpreter: GraphQL[R, Q, M, S, E],
query: GraphQLRequest
): URIO[R, Json] =
execute(interpreter, query)
.foldCause(cause => GraphQLResponse(NullValue, cause.defects).asJson, _.asJson)

def makeRestService[R, Q, M, S, E](interpreter: GraphQL[R, Q, M, S, E]): HttpRoutes[RIO[R, *]] = {
object dsl extends Http4sDsl[RIO[R, *]]
import dsl._

HttpRoutes.of[RIO[R, *]] {
case req @ POST -> Root =>
for {
query <- req.attemptAs[GraphQLRequest].value.absolve
result <- execute(interpreter, query)
.foldCause(cause => GraphQLResponse(NullValue, cause.defects).asJson, _.asJson)
query <- req.attemptAs[GraphQLRequest].value.absolve
result <- executeToJson(interpreter, query)
response <- Ok(result)
} yield response
}
}

def executeRequest[R0, R, Q, M, S, E](interpreter: GraphQL[R, Q, M, S, E], provideEnv: R0 => R): HttpApp[RIO[R0, *]] =
Kleisli { req =>
object dsl extends Http4sDsl[RIO[R0, *]]
import dsl._
for {
query <- req.attemptAs[GraphQLRequest].value.absolve
result <- executeToJson(interpreter, query).provideSome[R0](provideEnv)
response <- Ok(result)
} yield response
}

def makeWebSocketService[R, Q, M, S, E](interpreter: GraphQL[R, Q, M, S, E]): HttpRoutes[RIO[R, *]] = {

object dsl extends Http4sDsl[RIO[R, *]]
Expand Down Expand Up @@ -195,6 +212,15 @@ object Http4sAdapter {
.dimap((req: Request[F]) => req.mapK(toTask))((res: Response[Task]) => res.mapK(toF))
}

private def wrapApp[F[_]: Effect](app: HttpApp[Task])(implicit runtime: Runtime[Any]): HttpApp[F] = {
val toF: Task ~> F = λ[Task ~> F](_.toIO.to[F])
val toTask: F ~> Task = λ[F ~> Task](_.toIO.to[Task])

app
.mapK(toF)
.dimap((req: Request[F]) => req.mapK(toTask))((res: Response[Task]) => res.mapK(toF))
}

def makeWebSocketServiceF[F[_], Q, M, S, E](
interpreter: GraphQL[Any, Q, M, S, E]
)(implicit F: Effect[F], runtime: Runtime[Any]): HttpRoutes[F] =
Expand All @@ -205,4 +231,8 @@ object Http4sAdapter {
)(implicit F: Effect[F], runtime: Runtime[Any]): HttpRoutes[F] =
wrapRoute(makeRestService[Any, Q, M, S, E](interpreter))

def executeRequestF[F[_], Q, M, S, E](
interpreter: GraphQL[Any, Q, M, S, E]
)(implicit F: Effect[F], runtime: Runtime[Any]): HttpApp[F] =
wrapApp(executeRequest[Any, Any, Q, M, S, E](interpreter, identity))
}