Feature request: Subscriptions

[itsezc]

Are there any plans to support Subscriptions?

and how about other features such as @batch, @relay, @defer, @stream and @live (Apollo GraphQL Blog)

I understand that said features would take considerable effort to implement, but I'm sure that if there was to be a roadmap the community will start submitting PR for these features.

[jgillich]

The goal is to support the latest GraphQL spec, so that's a yes regarding subscriptions. Not a fan of supporting out of spec extensions at least for now, but it looks like some of them might become part of the next GraphQL version anyhow.

[vrishtrix]

+1 I need subscriptions

[thomasDelaporte]

I'd love for @live and @stream to be supported, I have been waiting on Apollo 3.0 far too long

[jgillich]

I've looked into subscriptions and I feel like the best way to implement them is via channels:

class Subscription
  @[GraphQL::Field]
  def example : Channel(String)
    channel = Channel(String).new
    spawn do
      channel.send "foo"
      channel.send "bar"
    end
    channel
  end
end

For triggering updates from mutations one could use a channel on Context, so I don't think we need to add anything for that.

The spec doesn't define any transport protocol or format, but the most sensible thing seems to be to do what Apollo/graphql-ws do, with the ability to override it.

Does that sound good?

[atik7]

Please make example for redis ( https://github.com/davidyaha/graphql-redis-subscriptions ) , so it will be easy to put crystal app along with nodejs implementation syncing states, thanks,

[jaireddjawed]

Is this project still accepting contributions? I would like to attempt to implement the subscriptions feature.

[jgillich]

Kind of. Are you interested in becoming a maintainer? I think there are some issues that would need to be looked at before a new release can be made (notably #48)

[jaireddjawed]

Yes, I am interested. I did see #48, but wasnt sure how to respond there since the project doesn't create DB connections anywhere. I can follow up with him for further investigation.