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Tuples vs functions vs generics
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import scala.concurrent.{ExecutionContext, Future} | |
import cats.implicits._ | |
import shapeless.ops.tuple.IsComposite | |
import concurrent.ExecutionContext.Implicits._ | |
import shapeless.ops.tuple._ | |
def unwrap0[I, E, O](uf: I => Future[Either[E, O]]): I => Future[Either[E, O]] = uf | |
def unwrap1[I, K, E, O](uf: I => K => Future[Either[E, O]]): ((I, K)) => Future[Either[E, O]] = i => uf(i._1)(i._2) | |
def unwrapN[IN_TUPLE, OUT_TUPLE, I, E, O](uf: I => OUT_TUPLE => Future[Either[E, O]]) | |
(implicit ic: IsComposite.Aux[IN_TUPLE, I, OUT_TUPLE]) | |
: IN_TUPLE => Future[Either[E, O]] = | |
{inTuple => | |
uf(ic.head(inTuple))(ic.tail(inTuple)) | |
} | |
def withF1[I, K, E, A, O](af: I => Future[Either[E, A]]) | |
(uf: A => K => Future[Either[E, O]]) | |
(implicit ec: ExecutionContext) | |
: ((I, K)) => Future[Either[E, O]] = | |
{ i => | |
af(i._1).flatMap { | |
case Left(e) => Future.successful(Left(e)) | |
case Right(u) => | |
uf(u)(i._2) | |
} | |
} | |
def withFN[IN_TUPLE, OUT_TUPLE, I, E, A, O](af: I => Future[Either[E, A]]) | |
(uf: A => OUT_TUPLE => Future[Either[E, O]]) | |
(implicit ic: IsComposite.Aux[IN_TUPLE, I, OUT_TUPLE], ec: ExecutionContext) | |
: IN_TUPLE => Future[Either[E, O]] = | |
{ inTuple => | |
val t = ic.head(inTuple) | |
af(t).flatMap { | |
case Left(e) => Future.successful(Left(e)) | |
case Right(u) => | |
val outTuple = ic.tail(inTuple) | |
uf(u)(outTuple) | |
} | |
} | |
def authFunc(b: Boolean): Future[Either[String, Int]] = if(b) Future.successful(1.asRight[String]) else Future.successful("error".asLeft[Int]) | |
def appLogic(id: Int, name: String, s1: String, s2: String): Future[Either[String, Int]] = Future.successful(1.asRight[String]) | |
val endpointLogic: ((Boolean, String)) => Future[Either[String, Int]] = { | |
withF1(authFunc){ userId => | |
unwrap0 { name => | |
appLogic(userId, name, "", "") | |
} | |
} | |
} | |
val endpointLogic2: ((Boolean, String, String)) => Future[Either[String, Int]] = { | |
withFN(authFunc){ userId => | |
unwrap1 { name: String => | |
unwrap0 { email: String => | |
appLogic(userId, name, email, "") | |
} | |
} | |
} | |
} | |
val endpointLogic3: ((Boolean, String, String, String)) => Future[Either[String, Int]] = { | |
withFN(authFunc){ userId: Int => | |
unwrapN { dummy: String => | |
unwrap1 { name: String => | |
unwrap0 { email: String => | |
appLogic(userId, name, email, dummy) | |
} | |
} | |
} | |
} | |
} | |
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