Support struct in Scala layer

Signed-off-by: Hongxin Liang <[email protected]>

flytekit-examples-scala/src/main/resources/META-INF/services/org.flyte.flytekit.SdkLaunchPlanRegistry

@@ -1 +1 @@
-org.flyte.examples.flytekitscala.FibonacciLaunchPlan
+org.flyte.examples.flytekitscala.LaunchPlanRegistry

flytekit-examples-scala/src/main/resources/META-INF/services/org.flyte.flytekit.SdkRunnableTask

@@ -3,3 +3,4 @@ org.flyte.examples.flytekitscala.SumTask
 org.flyte.examples.flytekitscala.GreetTask
 org.flyte.examples.flytekitscala.AddQuestionTask
 org.flyte.examples.flytekitscala.NoInputsTask
+org.flyte.examples.flytekitscala.NestedIOTask

flytekit-examples-scala/src/main/resources/META-INF/services/org.flyte.flytekit.SdkWorkflow

@@ -1,2 +1,3 @@
 org.flyte.examples.flytekitscala.FibonacciWorkflow
 org.flyte.examples.flytekitscala.WelcomeWorkflow
+org.flyte.examples.flytekitscala.NestedIOWorkflow

flytekit-examples-scala/src/main/scala/org/flyte/examples/flytekitscala/FibonacciLaunchPlan.scala → flytekit-examples-scala/src/main/scala/org/flyte/examples/flytekitscala/LaunchPlanRegistry.scala

@@ -20,8 +20,9 @@ import org.flyte.flytekit.{SdkLaunchPlan, SimpleSdkLaunchPlanRegistry}
 import org.flyte.flytekitscala.SdkScalaType
 
 case class FibonacciLaunchPlanInput(fib0: Long, fib1: Long)
+case class NestedIOLaunchPlanInput(name: String, generic: Nested)
 
-class FibonacciLaunchPlan extends SimpleSdkLaunchPlanRegistry {
+class LaunchPlanRegistry extends SimpleSdkLaunchPlanRegistry {
   // Register default launch plans for all workflows
   registerDefaultLaunchPlans()
 
@@ -53,4 +54,33 @@ class FibonacciLaunchPlan extends SimpleSdkLaunchPlanRegistry {
       .withDefaultInput("fib0", 0L)
       .withDefaultInput("fib1", 1L)
   )
+
+  registerLaunchPlan(
+    SdkLaunchPlan
+      .of(new NestedIOWorkflow)
+      .withName("NestedIOWorkflowLaunchPlan")
+      .withDefaultInput(
+        SdkScalaType[NestedIOLaunchPlanInput],
+        NestedIOLaunchPlanInput(
+          "yo",
+          Nested(
+            boolean = true,
+            1.toByte,
+            2.toShort,
+            3,
+            4L,
+            5.toFloat,
+            6.toDouble,
+            "hello",
+            List("1", "2"),
+            Map("1" -> "1", "2" -> "2"),
+            Some(false),
+            None,
+            Some(List("3", "4")),
+            Some(Map("3" -> "3", "4" -> "4")),
+            NestedNested(7.toDouble, NestedNestedNested("world"))
+          )
+        )
+      )
+  )
 }

flytekit-examples-scala/src/main/scala/org/flyte/examples/flytekitscala/NestedIOTask.scala

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2023 Flyte Authors.
+ *
+ * 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 org.flyte.examples.flytekitscala
+
+import org.flyte.flytekit.{SdkBindingData, SdkRunnableTask, SdkTransform}
+import org.flyte.flytekitscala.{
+  Description,
+  SdkBindingDataFactory,
+  SdkScalaType
+}
+
+case class NestedNestedNested(string: String)
+case class NestedNested(double: Double, nested: NestedNestedNested)
+case class Nested(
+    boolean: Boolean,
+    byte: Byte,
+    short: Short,
+    int: Int,
+    long: Long,
+    float: Float,
+    double: Double,
+    string: String,
+    list: List[String],
+    map: Map[String, String],
+    optBoolean: Option[Boolean],
+    optByte: Option[Byte],
+    optList: Option[List[String]],
+    optMap: Option[Map[String, String]],
+    nested: NestedNested
+)
+case class NestedIOTaskInput(
+    @Description("the name of the person to be greeted")
+    name: SdkBindingData[String],
+    @Description("a nested input")
+    generic: SdkBindingData[Nested]
+)
+case class NestedIOTaskOutput(
+    @Description("the name of the person to be greeted")
+    name: SdkBindingData[String],
+    @Description("a nested input")
+    generic: SdkBindingData[Nested]
+)
+
+/** Example Flyte task that takes a name as the input and outputs a simple
+  * greeting message.
+  */
+class NestedIOTask
+    extends SdkRunnableTask[
+      NestedIOTaskInput,
+      NestedIOTaskOutput
+    ](
+      SdkScalaType[NestedIOTaskInput],
+      SdkScalaType[NestedIOTaskOutput]
+    ) {
+
+  /** Defines task behavior. This task takes a name as the input, wraps it in a
+    * welcome message, and outputs the message.
+    *
+    * @param input
+    *   the name of the person to be greeted
+    * @return
+    *   the welcome message
+    */
+  override def run(input: NestedIOTaskInput): NestedIOTaskOutput =
+    NestedIOTaskOutput(
+      input.name,
+      input.generic
+    )
+}

flytekit-examples-scala/src/main/scala/org/flyte/examples/flytekitscala/NestedIOWorkflow.scala

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020-2023 Flyte Authors.
+ *
+ * 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 org.flyte.examples.flytekitscala
+
+import org.flyte.flytekitscala.{
+  SdkScalaType,
+  SdkScalaWorkflow,
+  SdkScalaWorkflowBuilder
+}
+
+class NestedIOWorkflow
+    extends SdkScalaWorkflow[NestedIOTaskInput, Unit](
+      SdkScalaType[NestedIOTaskInput],
+      SdkScalaType.unit
+    ) {
+
+  override def expand(
+      builder: SdkScalaWorkflowBuilder,
+      input: NestedIOTaskInput
+  ): Unit = {
+    builder.apply(new NestedIOTask(), input)
+  }
+}

flytekit-scala_2.13/src/main/scala/org/flyte/flytekitscala/SdkLiteralTypes.scala

@@ -24,7 +24,18 @@ import org.flyte.flytekit.{
 
 import java.time.{Duration, Instant}
 import scala.collection.JavaConverters._
-import scala.reflect.runtime.universe.{TypeTag, typeOf}
+import scala.reflect.api.{Mirror, TypeCreator, Universe}
+import scala.reflect.runtime.universe
+import scala.reflect.{ClassTag, classTag}
+import scala.reflect.runtime.universe.{
+  NoPrefix,
+  Symbol,
+  Type,
+  TypeTag,
+  runtimeMirror,
+  termNames,
+  typeOf
+}
 
 object SdkLiteralTypes {
 
@@ -202,6 +213,185 @@ object SdkLiteralTypes {
     */
   def durations(): SdkLiteralType[Duration] = SdkJavaLiteralTypes.durations()
 
+  /** Returns a [[SdkLiteralType]] for products.
+    * @return
+    *   the [[SdkLiteralType]]
+    */
+  def generics[T <: Product: TypeTag: ClassTag](): SdkLiteralType[T] = {
+    ScalaLiteralType[T](
+      LiteralType.ofSimpleType(SimpleType.STRUCT),
+      (value: T) => Literal.ofScalar(Scalar.ofGeneric(toStruct(value))),
+      (x: Literal) => toProduct(x.scalar().generic()),
+      (v: T) => BindingData.ofScalar(Scalar.ofGeneric(toStruct(v))),
+      "generics"
+    )
+  }
+
+  private def toStruct(product: Product): Struct = {
+    def productToMap(product: Product): Map[String, Any] = {
+      // by spec getDeclaredFields is not ordered but in practice it works fine
+      // it's a lot better since Scala 2.13 because productElementNames was introduced
+      //   (product.productElementNames zip product.productIterator).toMap
+      product.getClass.getDeclaredFields
+        .map(_.getName)
+        .zip(product.productIterator.toList)
+        .toMap
+    }
+
+    def mapToStruct(map: Map[String, Any]): Struct = {
+      val fields = map.map({ case (key, value) =>
+        (key, anyToStructValue(value))
+      })
+      Struct.of(fields.asJava)
+    }
+
+    def anyToStructValue(value: Any): Struct.Value = {
+      def anyToStructureValue0(value: Any): Struct.Value = {
+        value match {
+          case s: String => Struct.Value.ofStringValue(s)
+          case n @ (_: Byte | _: Short | _: Int | _: Long | _: Float |
+              _: Double) =>
+            Struct.Value.ofNumberValue(n.toString.toDouble)
+          case b: Boolean => Struct.Value.ofBoolValue(b)
+          case l: List[Any] =>
+            Struct.Value.ofListValue(l.map(anyToStructValue).asJava)
+          case m: Map[_, _] =>
+            Struct.Value.ofStructValue(
+              mapToStruct(m.asInstanceOf[Map[String, Any]])
+            )
+          case null => Struct.Value.ofNullValue()
+          case p: Product =>
+            Struct.Value.ofStructValue(mapToStruct(productToMap(p)))
+          case _ =>
+            throw new IllegalArgumentException(
+              s"Unsupported type: ${value.getClass}"
+            )
+        }
+      }
+
+      value match {
+        case Some(v) => anyToStructureValue0(v)
+        case None    => Struct.Value.ofNullValue()
+        case _       => anyToStructureValue0(value)
+      }
+    }
+
+    mapToStruct(productToMap(product))
+  }
+
+  private def toProduct[T <: Product: TypeTag: ClassTag](
+      struct: Struct
+  ): T = {
+    def structToMap(struct: Struct): Map[String, Any] = {
+      struct
+        .fields()
+        .asScala
+        .map({ case (key, value) =>
+          (key, structValueToAny(value))
+        })
+        .toMap
+    }
+
+    def mapToProduct[S <: Product: TypeTag: ClassTag](
+        map: Map[String, Any]
+    ): S = {
+      val mirror = runtimeMirror(classTag[S].runtimeClass.getClassLoader)
+
+      def valueToParamValue(value: Any, param: Symbol): Any = {
+        def valueToParamValue0(value: Any, param: Symbol): Any = {
+          if (param.typeSignature =:= typeOf[Byte]) {
+            value.asInstanceOf[Double].toByte
+          } else if (param.typeSignature =:= typeOf[Short]) {
+            value.asInstanceOf[Double].toShort
+          } else if (param.typeSignature =:= typeOf[Int]) {
+            value.asInstanceOf[Double].toInt
+          } else if (param.typeSignature =:= typeOf[Long]) {
+            value.asInstanceOf[Double].toLong
+          } else if (param.typeSignature =:= typeOf[Float]) {
+            value.asInstanceOf[Double].toFloat
+          } else if (param.typeSignature <:< typeOf[Product]) {
+            val typeTag = createTypeTag(param.typeSignature)
+            val classTag = ClassTag(
+              typeTag.mirror.runtimeClass(param.typeSignature)
+            )
+            mapToProduct(value.asInstanceOf[Map[String, Any]])(
+              typeTag,
+              classTag
+            )
+          } else {
+            value
+          }
+        }
+
+        if (param.typeSignature <:< typeOf[Option[Any]]) {
+          Some(
+            valueToParamValue0(
+              value,
+              param.typeSignature.dealias.typeArgs.head.typeSymbol
+            )
+          )
+        } else {
+          valueToParamValue0(value, param)
+        }
+      }
+
+      def createTypeTag[U <: Product](tpe: Type): TypeTag[U] = {
+        val typSym = mirror.staticClass(tpe.typeSymbol.fullName)
+        // note: this uses internal API, otherwise we will need to depend on scala-compiler at runtime
+        val typeRef =
+          universe.internal.typeRef(NoPrefix, typSym, List.empty)
+
+        TypeTag(
+          mirror,
+          new TypeCreator {
+            override def apply[V <: Universe with Singleton](
+                m: Mirror[V]
+            ): V#Type = {
+              assert(
+                m == mirror,
+                s"TypeTag[$typeRef] defined in $mirror cannot be migrated to $m."
+              )
+              typeRef.asInstanceOf[V#Type]
+            }
+          }
+        )
+      }
+
+      val clazz = typeOf[S].typeSymbol.asClass
+      val classMirror = mirror.reflectClass(clazz)
+      val constructor = typeOf[S].decl(termNames.CONSTRUCTOR).asMethod
+      val constructorMirror = classMirror.reflectConstructor(constructor)
+
+      val constructorArgs =
+        constructor.paramLists.flatten.map((param: Symbol) => {
+          val paramName = param.name.toString
+          val value = map.getOrElse(
+            paramName,
+            throw new IllegalArgumentException(
+              s"Map is missing required parameter named $paramName"
+            )
+          )
+          valueToParamValue(value, param)
+        })
+
+      constructorMirror(constructorArgs: _*).asInstanceOf[S]
+    }
+
+    def structValueToAny(value: Struct.Value): Any = {
+      value.kind() match {
+        case Struct.Value.Kind.STRING_VALUE => value.stringValue()
+        case Struct.Value.Kind.NUMBER_VALUE => value.numberValue()
+        case Struct.Value.Kind.BOOL_VALUE   => value.boolValue()
+        case Struct.Value.Kind.LIST_VALUE =>
+          value.listValue().asScala.map(structValueToAny).toList
+        case Struct.Value.Kind.STRUCT_VALUE => structToMap(value.structValue())
+        case Struct.Value.Kind.NULL_VALUE   => None
+      }
+    }
+
+    mapToProduct[T](structToMap(struct))
+  }
+
   /** Returns a [[SdkLiteralType]] for blob.
     *
     * @return