larshei
As a simple example, a server stores posts and clients can create posts. Other clients should receive updates, when a new post is created, based on a post subscription.
Embedded Device --(creates_post)--> Data Server <--(subscribes)-- Some Client we don't know yet
The server is set up with a schema that includes a subcription.
Using graphiql on the server I can subscribe to post_created that is triggered whenever a new post is created and updates are displayed in graphiql whenever I create a new Post by using HTTPoison through the elixir shell.
Communication is done using phoenix channels between the server and graphiql, right?
Thats not really something I can use to communicate with some client that I do not know much about.
How would I expose the subscription to a graphQL client?
I probably cant use phoenix channels and read something about Apollo?
Is there a more generic way or would apollo be the generic way?
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vincer
The generic way would probably just be with the phoenix npm package:
https://www.npmjs.com/package/phoenix
We use this method to update web pages live in a CMS. We send a subscribe GraphQL query, store the ID returned and then handle the “subscribe:data” events that Absinthe/Phoenix sends down.