Remove invalid defaults from a few services

.changelog/24113a10aa884c7dbef8b7c9989da291.json

@@ -0,0 +1,8 @@
+{
+    "id": "24113a10-aa88-4c7d-bef8-b7c9989da291",
+    "type": "feature",
+    "description": "**BREAKFIX**: Correct nullability of InitialCapacityConfig's WorkerCount field. The type of this value has changed from int64 to *int64. Due to this field being marked required, with an enforced minimum of 1, but a default of 0, the former type would result in automatic failure behavior without caller intervention. Calling code will need to be updated accordingly.",
+    "modules": [
+        "service/emrserverless"
+    ]
+}

.changelog/d4bc92a6c4064c22bd2b44f9a82587ce.json

@@ -0,0 +1,8 @@
+{
+    "id": "d4bc92a6-c406-4c22-bd2b-44f9a82587ce",
+    "type": "feature",
+    "description": "**BREAKFIX**: Correct nullability of GetExperimentResultsInput's Period field. The type of this value has changed from int64 to *int64. Due to the nature of default value serialization, the former type could cause unexpected/incorrect behavior when set to its zero value. Calling code will need to be updated accordingly.",
+    "modules": [
+        "service/evidently"
+    ]
+}

codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/customization/RemoveDefaults.java

@@ -3,27 +3,36 @@
 import software.amazon.smithy.go.codegen.GoSettings;
 import software.amazon.smithy.go.codegen.integration.GoIntegration;
 import software.amazon.smithy.model.Model;
+import software.amazon.smithy.model.shapes.MemberShape;
 import software.amazon.smithy.model.shapes.Shape;
-import software.amazon.smithy.model.shapes.AbstractShapeBuilder;
 import software.amazon.smithy.model.shapes.ShapeId;
 import software.amazon.smithy.model.traits.DefaultTrait;
 import software.amazon.smithy.model.transform.ModelTransformer;
 import software.amazon.smithy.utils.MapUtils;
-import software.amazon.smithy.utils.SetUtils;
-import software.amazon.smithy.utils.ToSmithyBuilder;
 
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 public class RemoveDefaults implements GoIntegration {
-    private static final Map<ShapeId, Set<ShapeId>> toRemove = MapUtils.of(
-            ShapeId.from("com.amazonaws.s3control#AWSS3ControlServiceV20180820"), SetUtils.of(
-                    ShapeId.from("com.amazonaws.s3control#PublicAccessBlockConfiguration$BlockPublicAcls"),
-                    ShapeId.from("com.amazonaws.s3control#PublicAccessBlockConfiguration$IgnorePublicAcls"),
-                    ShapeId.from("com.amazonaws.s3control#PublicAccessBlockConfiguration$BlockPublicPolicy"),
-                    ShapeId.from("com.amazonaws.s3control#PublicAccessBlockConfiguration$RestrictPublicBuckets")
-            )
-    );
+    private static final Map<ShapeId, Set<ShapeId>> toRemove = MapUtils.ofEntries(
+        serviceToShapeIds("com.amazonaws.s3control#AWSS3ControlServiceV20180820",
+                "com.amazonaws.s3control#PublicAccessBlockConfiguration$BlockPublicAcls",
+                "com.amazonaws.s3control#PublicAccessBlockConfiguration$IgnorePublicAcls",
+                "com.amazonaws.s3control#PublicAccessBlockConfiguration$BlockPublicPolicy",
+                "com.amazonaws.s3control#PublicAccessBlockConfiguration$RestrictPublicBuckets"),
+        serviceToShapeIds("com.amazonaws.evidently#Evidently",
+                "com.amazonaws.evidently#ResultsPeriod"),
+        serviceToShapeIds("com.amazonaws.amplifyuibuilder#AmplifyUIBuilder",
+                "smithy.go.synthetic#ListPlaceIndexesInput$MaxResults",
+                "smithy.go.synthetic#SearchPlaceIndexForSuggestionsInput$MaxResults",
+                "com.amazonaws.location#PlaceIndexSearchResultLimit"),
+        serviceToShapeIds("com.amazonaws.paymentcryptographydata#PaymentCryptographyDataPlane",
+                "com.amazonaws.paymentcryptographydata#IntegerRangeBetween4And12"),
+        serviceToShapeIds("com.amazonaws.emrserverless#AwsToledoWebService",
+                "com.amazonaws.emrserverless#WorkerCounts"));
 
     private boolean mustPreprocess(ShapeId service) {
         return toRemove.containsKey(service);
@@ -38,16 +47,52 @@ public Model preprocessModel(Model model, GoSettings settings) {
     }
 
     private Model removeDefaults(Model model, Set<ShapeId> fromShapes) {
-        return ModelTransformer.create().mapShapes(model, it ->
-                fromShapes.contains(it.getId())
-                        ? withoutDefault(it)
-                        : it
-        );
+        Set<ShapeId> removedRootDefaults = new HashSet<>();
+        Model removedRootDefaultsModel = ModelTransformer.create().mapShapes(model, (shape) -> {
+            if (shouldRemoveRootDefault(shape, fromShapes)) {
+                removedRootDefaults.add(shape.getId());
+                return withoutDefault(shape);
+            } else {
+                return shape;
+            }
+        });
+        return ModelTransformer.create().mapShapes(removedRootDefaultsModel, (shape) -> {
+            if (shouldRemoveMemberDefault(shape, removedRootDefaults, fromShapes)) {
+                return withoutDefault(shape);
+            } else {
+                return shape;
+            }
+        });
+    }
+
+    private boolean shouldRemoveRootDefault(Shape shape, Set<ShapeId> removeDefaultsFrom) {
+        return !shape.isMemberShape()
+                && removeDefaultsFrom.contains(shape.getId())
+                && shape.hasTrait(DefaultTrait.class);
+    }
+
+    private boolean shouldRemoveMemberDefault(
+            Shape shape,
+            Set<ShapeId> removedRootDefaults,
+            Set<ShapeId> removeDefaultsFrom
+    ) {
+        if (!shape.isMemberShape()) {
+            return false;
+        }
+        MemberShape member = shape.asMemberShape().get();
+        return (removedRootDefaults.contains(member.getTarget()) || removeDefaultsFrom.contains(member.getId()))
+                && member.hasTrait(DefaultTrait.class);
     }
 
     private Shape withoutDefault(Shape shape) {
         return Shape.shapeToBuilder(shape)
                 .removeTrait(DefaultTrait.ID)
                 .build();
     }
+
+    private static Map.Entry<ShapeId, Set<ShapeId>> serviceToShapeIds(String serviceId, String... shapeIds) {
+        return Map.entry(
+                ShapeId.from(serviceId),
+                Arrays.stream(shapeIds).map(ShapeId::from).collect(Collectors.toSet()));
+    }
 }