Today I tried to make a very simple GraphQL subscription and hit some dead ends. Details in thread.

# graphql-kotlin

[Neal Sanche]

Today I tried to make a very simple GraphQL subscription and hit some dead ends. Details in thread.

[Neal Sanche]

On the graphql-kotlin server side I wrote this silly subscription.

Untitled

[Neal Sanche]

This is being consumed by Apollo GraphQL on Kotlin Multiplatform. But, what I see over on that side is that usually all I get is the first string, "hi" or the first and last string, but rarely do I get all of them. I'd be willing to concede that this might be an issue on the client side, but thought I'd ask here first if anyone has had these sorts of issues?

[Shane Myrick]

Adding this function to the example spring app and calling it from the GraphQL Playground returns the correct data, so it sounds like a client issue

fun flowBuilder(): Publisher<String> = kotlinx.coroutines.flow.flow {
        emit("hi")
        delay(1000)
        emit("there")
        delay(1000)
        emit("world")
    }.asPublisher()

[Shane Myrick]

Make sure your client is implementing the graphql-ws protocol

https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md

[Neal Sanche]

Thanks, yes, I do think there's some sort of mismatch going on with this. And I will focus on the client side and see if I can verify which protocol is being used.

[Neal Sanche]

It does use graphql-ws. So I'll keep looking for why this isn't working.