GraphQL to support federation

[jaspertandy]

I was torn on whether to post this as a bug, but since the GraphQL implementation doesn't claim to support federation, it's not.

However, it would make Craft's GraphQL implementation so useful to support the federation spec. Is this on the roadmap at all? I have a project coming up that would hugely benefit from it if it's at all possible.

At the moment, when I try to set Craft as a downstream in a federated config, I receive the following error:

Error checking for changes to service definitions: Couldn't load service definitions for "craft" at http://craft/graphql: Cannot query field "_service" on type "Query".

const gateway = new ApolloGateway({
  serviceList: [
    { name: 'users', url: 'http://users:4000' },
    { name: 'collections', url: 'http://collections:4000' },
    { name: 'craft', url: 'http://craft/graphql' }
  ]
});

This pointed me to this issue on Apollo Server, which then links off to the federation spec.

Would this be something that's feasible to add?

[andris-sevcenko]

It would need to be supported by the library that we're using, but I'm not sure if that's on a workable timetable, there. There was some work going on regarding that at some point, but it seems like it stalled. (nuwave/lighthouse#1051)

I'll keep this open, though, as it is a useful feature and maybe we can figure out a way of adding it.

[charlie-hadden]

Just to note: it appears that there is at least experimental support for this upstream now: https://lighthouse-php.com/5/federation/getting-started.html

[marjorg]

@andris-sevcenko Would be cool to have a way to plug into this using Craft