fix RPC protocol error deser

Author: AllanZhengYP

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java

@@ -656,8 +656,7 @@ private List<HttpBinding> readErrorResponseBody(
         if (isErrorCodeInBody) {
             // Body is already parsed in error dispatcher, simply assign body to data.
             writer.write("const data: any = output.body;");
-            List<HttpBinding> responseBindings = bindingIndex.getResponseBindings(error).values()
-                    .stream().collect(Collectors.toList());
+            List<HttpBinding> responseBindings = bindingIndex.getResponseBindings(error, Location.DOCUMENT);
             responseBindings.sort(Comparator.comparing(HttpBinding::getMemberName));
             return responseBindings;
         } else {

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpRpcProtocolGenerator.java

@@ -90,6 +90,8 @@ public void generateSharedComponents(GenerationContext context) {
         generateDocumentBodyShapeSerializers(context, serializingDocumentShapes);
         generateDocumentBodyShapeDeserializers(context, deserializingDocumentShapes);
         HttpProtocolGeneratorUtils.generateMetadataDeserializer(context, getApplicationProtocol().getResponseType());
+        HttpProtocolGeneratorUtils.generateCollectBody(context);
+        HttpProtocolGeneratorUtils.generateCollectBodyString(context);
     }
 
     @Override
@@ -285,14 +287,20 @@ private void generateErrorDeserializer(GenerationContext context, StructureShape
                        + "  context: __SerdeContext\n"
                        + "): Promise<$T> => {", "};", errorDeserMethodName, outputReference, errorSymbol, () -> {
             // First deserialize the body properly.
-            writer.write("const deserialized: any = $L($L.body, context);",
-                    ProtocolGenerator.getDeserFunctionName(errorSymbol, context.getProtocolName()), outputReference);
+            if (isErrorCodeInBody) {
+                writer.write("const body = $L.body", outputReference);
+            } else {
+                // If error node not in body, error body is not parsed in dispatcher.
+                writer.write("const body = parsedBody($L.body, context);", outputReference);
+            }
+            writer.write("const deserialized: any = $L(body, context);",
+                    ProtocolGenerator.getDeserFunctionName(errorSymbol, context.getProtocolName()));
 
             // Then load it into the object with additional error and response properties.
             writer.openBlock("const contents: $T = {", "};", errorSymbol, () -> {
                 writer.write("__type: $S,", error.getId().getName());
                 writer.write("$$fault: $S,", error.getTrait(ErrorTrait.class).get().getValue());
-                writer.write("$$metadata: deserializeMetadata(output),");
+                writer.write("$$metadata: deserializeMetadata($L),", outputReference);
                 writer.write("...deserialized,");
             });