first tests for federation

server/implementation/src/main/java/io/smallrye/graphql/SmallRyeGraphQLServerLogging.java

@@ -94,4 +94,7 @@ public interface SmallRyeGraphQLServerLogging {
     @Message(id = 15000, value = "Using %s service for context propagation")
     void usingContextPropagationService(String name);
 
+    @LogMessage(level = Logger.Level.DEBUG)
+    @Message(id = 16000, value = "Enable GraphQL Federation")
+    void enableFederation();
 }

server/implementation/src/main/java/io/smallrye/graphql/bootstrap/Bootstrap.java

@@ -180,6 +180,7 @@ private void generateGraphQLSchema() {
         JsonInputRegistry.override(overrides);
 
         if (Config.get().isFederationEnabled()) {
+            log.enableFederation();
             GraphQLSchema rawSchema = schemaBuilder.build();
             this.graphQLSchema = Federation.transform(rawSchema)
                     .fetchEntities(new FederationDataFetcher(rawSchema.getQueryType(), rawSchema.getCodeRegistry()))

server/runner/src/main/resources/META-INF/microprofile-config.properties

@@ -2,7 +2,7 @@ smallrye.graphql.printDataFetcherException=true
 smallrye.graphql.tracing.enabled=true
 smallrye.graphql.allowGet=true
 smallrye.graphql.logPayload=true
-
 mp.graphql.showErrorMessage=java.security.AccessControlException,io.smallrye.graphql.test.apps.exceptionlist.*
 mp.graphql.hideErrorMessage=java.io.IOException,io.smallrye.graphql.test.apps.exceptionlist.*
-smallrye.graphql.errorExtensionFields=exception,classification,code,description,validationErrorType,queryPath
+smallrye.graphql.errorExtensionFields=exception,classification,code,description,validationErrorType,queryPath
+smallrye.graphql.federation.enabled=true

server/tck/src/test/java/io/smallrye/graphql/test/apps/federation/price/api/Prices.java

@@ -0,0 +1,23 @@
+package io.smallrye.graphql.test.apps.federation.price.api;
+
+import static java.util.Arrays.asList;
+
+import java.util.List;
+
+import org.eclipse.microprofile.graphql.GraphQLApi;
+import org.eclipse.microprofile.graphql.Id;
+import org.eclipse.microprofile.graphql.Query;
+
+@GraphQLApi
+public class Prices {
+    private static final List<ProductWithPrice> PRICES = asList(
+            ProductWithPrice.product("1", 100),
+            ProductWithPrice.product("2", 400));
+
+    @Query
+    public ProductWithPrice product(@Id String id) {
+        return PRICES.stream()
+                .filter(productWithPrice -> productWithPrice.getId().equals(id))
+                .findFirst().orElseThrow(() -> new RuntimeException("product not find"));
+    }
+}

server/tck/src/test/java/io/smallrye/graphql/test/apps/federation/price/api/ProductWithPrice.java

@@ -0,0 +1,40 @@
+package io.smallrye.graphql.test.apps.federation.price.api;
+
+import org.eclipse.microprofile.graphql.Id;
+
+import io.smallrye.graphql.api.federation.Extends;
+import io.smallrye.graphql.api.federation.Key;
+
+/**
+ * In a real federated service, this would also be a {@code Price}, but we can't have the same type twice within one service.
+ */
+@Key(fields = "id")
+@Extends
+public class ProductWithPrice {
+    public static ProductWithPrice product(String id, int price) {
+        ProductWithPrice product = new ProductWithPrice();
+        product.setId(id);
+        product.setPrice(price);
+        return product;
+    }
+
+    @Id
+    private String id;
+    private int price;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

server/tck/src/test/java/io/smallrye/graphql/test/apps/federation/product/api/Product.java

@@ -0,0 +1,35 @@
+package io.smallrye.graphql.test.apps.federation.product.api;
+
+import org.eclipse.microprofile.graphql.Id;
+
+import io.smallrye.graphql.api.federation.Key;
+
+@Key(fields = "id")
+public class Product {
+    static Product product(String id, String name) {
+        Product product = new Product();
+        product.setId(id);
+        product.setName(name);
+        return product;
+    }
+
+    @Id
+    private String id;
+    private String name;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

server/tck/src/test/java/io/smallrye/graphql/test/apps/federation/product/api/Products.java

@@ -0,0 +1,23 @@
+package io.smallrye.graphql.test.apps.federation.product.api;
+
+import static java.util.Arrays.asList;
+
+import java.util.List;
+
+import org.eclipse.microprofile.graphql.GraphQLApi;
+import org.eclipse.microprofile.graphql.Id;
+import org.eclipse.microprofile.graphql.Query;
+
+@GraphQLApi
+public class Products {
+    private static final List<Product> PRODUCTS = asList(
+            Product.product("1", "Armchair"),
+            Product.product("2", "Table"));
+
+    @Query
+    public Product product(@Id String id) {
+        return PRODUCTS.stream()
+                .filter(product -> product.getId().equals(id))
+                .findFirst().orElseThrow(() -> new RuntimeException("product not find"));
+    }
+}

server/tck/src/test/resources/tests/federation/input.graphql

@@ -0,0 +1,8 @@
+{
+  deepList{
+    names
+  }
+  deepListFoo{
+    bar
+  }
+}

server/tck/src/test/resources/tests/federation/output.json

@@ -0,0 +1,24 @@
+{
+  "data": {
+    "deepList": [
+      [
+        [
+          {
+            "names": [
+              "Phillip"
+            ]
+          }
+        ]
+      ]
+    ],
+    "deepListFoo": [
+      [
+        [
+          {
+            "bar": "bar"
+          }
+        ]
+      ]
+    ]
+  }
+}

server/tck/src/test/resources/tests/federation/test.properties

@@ -0,0 +1,2 @@
+ignore=false
+priority=100