apollo-kotlin-ffs is an Apollo compiler plugin that adds Federation Foreign Schemas (FFS) to the Apollo Compiler.
This is useful if you want to use Apollo Kotlin codegen with a schema that contains federation subgraph directives.
Those schemas are typically meant to be consumed by a server framework and not by a client. Clients should use introspection results or the full schema after it has been processed by the server framework.
Sometimes getting such a client schema is cumbersome. In those cases, apollo-kotlin-ffs adds the federation directives to the Apollo Kotlin compiler so that it can process the backend SDL.
Note
apollo-kotlin-ffs does not do any composition or any query planning. It is merely a tool to help clients validate schemas that are otherwise meant for server consumption.
To use apollo-kotlin-ffs in your project, add it as a plugin to your Apollo Kotlin service:
apollo {
service("service") {
packageName.set("com.example")
plugin("com.apollographql.ffs:apollo-kotlin-ffs:0.0.0")
}
}See apollographql/apollo-kotlin#6221 for more context.
The Kdoc API reference can be found at:
https://apollographql.github.io/apollo-kotlin-ffs/kdoc