backfill @required on ChangeMessageVisibilityBatchRequestEntry.Visibi…

…lityTimeout

.changelog/3a3fee5b50bb49bda3226e0b2622885e.json

@@ -0,0 +1,8 @@
+{
+    "id": "3a3fee5b-50bb-49bd-a322-6e0b2622885e",
+    "type": "bugfix",
+    "description": "Fix issue where SDK could not send a VisibilityTimeout of 0 in a ChangeMessageVisibilityBatchRequestEntry.",
+    "modules": [
+        "service/sqs"
+    ]
+}

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

@@ -0,0 +1,57 @@
+package software.amazon.smithy.aws.go.codegen.customization;
+
+import static java.util.stream.Collectors.toSet;
+
+import java.util.Arrays;
+import java.util.Map;
+import java.util.Set;
+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.Shape;
+import software.amazon.smithy.model.shapes.ShapeId;
+import software.amazon.smithy.model.traits.RequiredTrait;
+import software.amazon.smithy.model.transform.ModelTransformer;
+
+/**
+ * Adds the @required trait to inputs that have @default, but lack of serialization of their zero value causes issues.
+ *
+ * If a shape is listed here there should generally be an upstreaming effort with the service team to fix. Link issues
+ * in comments (or internal ticket IDs) where available.
+ */
+public class BackfillRequiredTrait implements GoIntegration {
+    private static final Map<ShapeId, Set<ShapeId>> toBackfill = Map.ofEntries(
+            serviceToShapeIds("com.amazonaws.sqs#AmazonSQS",
+                    // https://github.com/aws/aws-sdk/issues/527
+                    "com.amazonaws.sqs#ChangeMessageVisibilityBatchRequestEntry$VisibilityTimeout")
+    );
+
+    private boolean mustPreprocess(ShapeId service) {
+        return toBackfill.containsKey(service);
+    }
+
+    @Override
+    public Model preprocessModel(Model model, GoSettings settings) {
+        var serviceId = settings.getService();
+        return mustPreprocess(serviceId)
+                ? backfillRequired(model, toBackfill.get(serviceId))
+                : model;
+    }
+
+    private Model backfillRequired(Model model, Set<ShapeId> shapes) {
+        return ModelTransformer.create()
+                .mapShapes(model, (shape) -> shapes.contains(shape.getId()) ? withRequired(shape) : shape);
+    }
+
+    private Shape withRequired(Shape shape) {
+        return Shape.shapeToBuilder(shape)
+                .addTrait(new RequiredTrait())
+                .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(toSet()));
+    }
+}

codegen/smithy-aws-go-codegen/src/main/resources/META-INF/services/software.amazon.smithy.go.codegen.integration.GoIntegration

@@ -84,3 +84,4 @@ software.amazon.smithy.aws.go.codegen.customization.AccountIDEndpointRouting
 software.amazon.smithy.aws.go.codegen.customization.RetryModeUserAgent
 software.amazon.smithy.aws.go.codegen.customization.RequestCompressionUserAgent
 software.amazon.smithy.aws.go.codegen.customization.s3.ExpressUserAgent
+software.amazon.smithy.aws.go.codegen.customization.BackfillRequiredTrait