Automatically filter streaming operations

This adds an integration that strips out streaming operations, with the
intent that it will be removed once event streams are supported.

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

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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 software.amazon.smithy.aws.go.codegen;
+
+import java.util.Set;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+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.knowledge.EventStreamIndex;
+import software.amazon.smithy.model.shapes.OperationShape;
+import software.amazon.smithy.model.shapes.Shape;
+import software.amazon.smithy.model.transform.ModelTransformer;
+
+/**
+ * Filters out event stream operations.
+ * TODO: implement event streams
+ */
+public final class FilterStreamingOperations implements GoIntegration {
+    private static final Logger LOGGER = Logger.getLogger(FilterStreamingOperations.class.getName());
+
+    public FilterStreamingOperations() {}
+
+    @Override
+    public Model preprocessModel(Model model, GoSettings settings) {
+        EventStreamIndex index = EventStreamIndex.of(model);
+        Set<Shape> streamingOperations = model.shapes(OperationShape.class)
+                .filter(op -> index.getOutputInfo(op).isPresent() || index.getInputInfo(op).isPresent())
+                .peek(op -> LOGGER.warning(String.format(
+                        "Filtering out unsupported event stream operation: %s", op.getId().toString())))
+                .collect(Collectors.toSet());
+        ModelTransformer transformer = ModelTransformer.create();
+        return transformer.removeUnreferencedShapes(transformer.removeShapes(model, streamingOperations));
+    }
+}

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

@@ -26,3 +26,4 @@ software.amazon.smithy.aws.go.codegen.customization.S3ErrorWith200Status
 software.amazon.smithy.aws.go.codegen.customization.Route53Customizations
 software.amazon.smithy.aws.go.codegen.customization.S3HeadObjectCustomizations
 software.amazon.smithy.aws.go.codegen.customization.PresignURLAutoFill
+software.amazon.smithy.aws.go.codegen.FilterStreamingOperations