fix: Ignore input event stream member when encoding input shape (#981)

* Ignore input event stream member when encoding input shape.

* Fix ktlint.

---------

Co-authored-by: Sichan Yoo <[email protected]>

Author: sichanyoo

smithy-swift-codegen/src/main/kotlin/software/amazon/smithy/swift/codegen/Utils.kt

@@ -7,6 +7,7 @@ package software.amazon.smithy.swift.codegen
 import software.amazon.smithy.aws.traits.protocols.AwsJson1_0Trait
 import software.amazon.smithy.aws.traits.protocols.AwsJson1_1Trait
 import software.amazon.smithy.model.shapes.ShapeId
+import software.amazon.smithy.protocol.traits.Rpcv2CborTrait
 import software.amazon.smithy.swift.codegen.lang.reservedWords
 import software.amazon.smithy.utils.CaseUtils
 
@@ -35,4 +36,9 @@ fun swiftEnumCaseName(
     return enumCaseName
 }
 
-fun supportsStreamingAndIsRPC(protocolID: ShapeId): Boolean = arrayOf(AwsJson1_0Trait.ID, AwsJson1_1Trait.ID).contains(protocolID)
+fun supportsStreamingAndIsRPC(protocolID: ShapeId): Boolean =
+    arrayOf(
+        AwsJson1_0Trait.ID,
+        AwsJson1_1Trait.ID,
+        Rpcv2CborTrait.ID,
+    ).contains(protocolID)

smithy-swift-codegen/src/main/kotlin/software/amazon/smithy/swift/codegen/integration/serde/member/MemberShapeEncodeGenerator.kt

@@ -11,6 +11,7 @@ import software.amazon.smithy.model.shapes.StructureShape
 import software.amazon.smithy.model.shapes.TimestampShape
 import software.amazon.smithy.model.shapes.UnionShape
 import software.amazon.smithy.model.traits.SparseTrait
+import software.amazon.smithy.model.traits.StreamingTrait
 import software.amazon.smithy.model.traits.TimestampFormatTrait
 import software.amazon.smithy.model.traits.XmlFlattenedTrait
 import software.amazon.smithy.swift.codegen.SwiftWriter
@@ -68,6 +69,14 @@ abstract class MemberShapeEncodeGenerator(
         memberShape: MemberShape,
         prefix: String,
     ) {
+        // If member shape is a event streaming member (union with streaming trait),
+        //   we must ignore it when encoding input struct.
+        // The event streaming member will be set as body via EventStreamBodyMiddleware.
+        val targetShape = ctx.model.expectShape(memberShape.target)
+        if (targetShape is UnionShape && targetShape.hasTrait<StreamingTrait>()) {
+            return
+        }
+
         val memberName = ctx.symbolProvider.toMemberName(memberShape)
         val propertyKey = nodeInfoUtils.nodeInfo(memberShape)
         val writingClosure = writingClosureUtils.writingClosure(memberShape)

smithy-swift-codegen/src/main/kotlin/software/amazon/smithy/swift/codegen/swiftintegrations/InitialRequestIntegration.kt

@@ -7,6 +7,7 @@ import software.amazon.smithy.model.Model
 import software.amazon.smithy.model.knowledge.EventStreamIndex
 import software.amazon.smithy.model.knowledge.TopDownIndex
 import software.amazon.smithy.model.shapes.StructureShape
+import software.amazon.smithy.protocol.traits.Rpcv2CborTrait
 import software.amazon.smithy.swift.codegen.SwiftDelegator
 import software.amazon.smithy.swift.codegen.SwiftSettings
 import software.amazon.smithy.swift.codegen.core.SwiftCodegenContext
@@ -26,7 +27,7 @@ class InitialRequestIntegration : SwiftIntegration {
         settings: SwiftSettings,
     ): Boolean {
         val service = settings.getService(model)
-        return service.hasTrait<AwsJson1_0Trait>() || service.hasTrait<AwsJson1_1Trait>()
+        return service.hasTrait<AwsJson1_0Trait>() || service.hasTrait<AwsJson1_1Trait>() || service.hasTrait<Rpcv2CborTrait>()
     }
 
     override fun writeAdditionalFiles(