QSERVER-17813 GraphQL Field Duplication Enabled

Author: Vishal-Rao-SU

qudini-reactive-graphql/README.md

@@ -38,6 +38,10 @@ public DataFetcherExceptionHandler graphqlExceptionHandler(...) {
     return ...;
 }
 ```
+### Query Depth
+
+Your GraphQL Max Query Depth  is expected to be available in the classpath, in `application.properties`. `qudini-reactive.graphql-max-depth` is the property name.
+Exception is thrown if Query Depth is exceeded. If Property itself is not present, default value 5 is set.
 
 ### Wiring
 

qudini-reactive-graphql/src/main/java/com/qudini/reactive/graphql/http/GraphQLHandler.java

@@ -4,11 +4,12 @@
 import com.qudini.reactive.logging.Log;
 import graphql.ExecutionResult;
 import graphql.GraphQL;
+import graphql.analysis.MaxQueryDepthInstrumentation;
 import graphql.execution.DataFetcherExceptionHandler;
-import graphql.execution.instrumentation.dataloader.DataLoaderDispatcherInstrumentation;
 import graphql.schema.GraphQLSchema;
 import lombok.RequiredArgsConstructor;
 import org.dataloader.DataLoaderRegistry;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.web.reactive.function.server.ServerRequest;
 import org.springframework.web.reactive.function.server.ServerResponse;
@@ -28,6 +29,9 @@ public final class GraphQLHandler {
     private final GraphQLSchema schema;
     private final DataFetcherExceptionHandler exceptionHandler;
 
+    @Value("${qudini-reactive.graphql-max-depth:5}")
+    private Integer maxDepth;
+
     public Mono<ServerResponse> postJson(ServerRequest request) {
         return Mono
                 .deferContextual(Mono::just)
@@ -42,7 +46,7 @@ private Mono<Map<String, Object>> execute(ContextView context, GraphQLRequest re
         var input = request.toExecutionInput(context, registry);
         var graphql = GraphQL
                 .newGraphQL(schema)
-                .instrumentation(new DataLoaderDispatcherInstrumentation())
+                .instrumentation(new MaxQueryDepthInstrumentation(maxDepth))
                 .defaultDataFetcherExceptionHandler(exceptionHandler)
                 .build();
         return Log