Gradle Plugin Doesn't Generate Federation Directives

[kartomic8]

When using the Gradle Plugin (v2.6.2), the output of the generateSchema gradle task does not appear to generate federation-compatible directives.

Sample code:

generateSchema {
    destination = "build/generated/schema.graphql"
    includeTransitiveDependencies = true
    includeDirectives = true
    includeScalars = true
}

// Example of annotated class
@Data
@AllArgsConstructor
@Shareable
public class Menu {
  @NonNull List<MenuItem> menuItems;
}

# generated graphql
# expected @shareable directive in the line below, but it is not there:

type Menu {
  menuItems: [MenuItem]!
}


# In addition, the federation directives aren't imported, nor are they defined in the output.

I took a look at the maven plugin, which does appear to implement federation, and I can't find similar code in the gradle plugin, so I believe its just not implemented. Can the team confirm, and if it isn't implemented advise on a timeframe for doing so?

[jmartisk]

Hi, currently the plugin assumes that it should enable Federation if at least one of these conditions is true:

• At least one of these Federation directives is detected in the app: https://github.com/smallrye/smallrye-graphql/blob/main/tools/gradle-plugin/plugin/src/main/java/io/smallrye/graphql/gradle/tasks/FederationDotNames.java#L28
• smallrye.graphql.federation.enabled system property is true

If this is not good enough, we welcome suggestions on how to improve it

[kartomic8]

Thanks for responding. @jmartisk, looks like most of it was user error, enabling the appopriate settings resulted in those directives being added to the schema. However, there's one thing I wanted to inquire about that we weren't able to figure out. We're using the Apollo Federated Router in our environment, and from playing around with it it seems to want us to import directives rather than redefine them.

E.g. This works with apollo router:

extend schema
  @link(url: "https://specs.apollo.dev/federation/v2.7",
        import: ["@key"]) {
  query: Query
  mutation: Mutation
}

But this generated output from the smallrye doesn't

"Designates an object type as an entity and specifies its key fields (a set of fields that the subgraph can use to uniquely identify any instance of the entity). You can apply multiple @key directives to a single entity (to specify multiple valid sets of key fields)."
directive @key(fields: FieldSet!, resolvable: Boolean = true) repeatable on OBJECT | INTERFACE

Is there a way we can get the smallrye-graphql library to emit the extend schema style of importing directions from the federation spec?