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Add ZSink.fromFunctionM #2112

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merged 1 commit into from Nov 3, 2019
Merged

Add ZSink.fromFunctionM #2112

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8 changes: 8 additions & 0 deletions streams-tests/jvm/src/test/scala/zio/stream/SinkSpec.scala
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Expand Up @@ -1041,6 +1041,14 @@ object SinkSpec
.runCollect,
equalTo(List("1", "2", "3", "4", "5"))
)
},
testM("fromFunctionM") {
assertM(
Stream("1", "2", "3", "4", "5")
.transduce(Sink.fromFunctionM[Throwable, String, Int](s => Task(s.toInt)))
.runCollect,
equalTo(List(1, 2, 3, 4, 5))
)
}
),
testM("fromOutputStream") {
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6 changes: 6 additions & 0 deletions streams/shared/src/main/scala/zio/stream/Sink.scala
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Expand Up @@ -191,6 +191,12 @@ object Sink extends Serializable {
final def fromFunction[A, B](f: A => B): Sink[Unit, Nothing, A, B] =
ZSink.fromFunction(f)

/**
* see [[ZSink.fromFunctionM]]
*/
final def fromFunctionM[E, A, B](f: A => ZIO[Any, E, B]): Sink[Option[E], Nothing, A, B] =
ZSink.fromFunctionM(f)

/**
* see [[ZSink.halt]]
*/
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6 changes: 6 additions & 0 deletions streams/shared/src/main/scala/zio/stream/ZSink.scala
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Expand Up @@ -1495,6 +1495,12 @@ object ZSink extends ZSinkPlatformSpecific with Serializable {
final def fromFunction[A, B](f: A => B): ZSink[Any, Unit, Nothing, A, B] =
identity.map(f)

/**
* Creates a sink that effectfully transforms incoming values.
*/
final def fromFunctionM[R, E, A, B](f: A => ZIO[R, E, B]): ZSink[R, Option[E], Nothing, A, B] =
identity.mapError(_ => None).mapM(f(_).mapError(Some(_)))

/**
* Creates a sink halting with a specified cause.
*/
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