graphql-subscriptions | small module that implements GraphQL subscriptions | GraphQL library

You just need to install graphql-subscriptions and subscriptions-transport-ws. And then you can easily add subscription server to your existing graphql endpoint. You can add it into your server creation code-

According to this issue Typescript must be ran in strict mode to transpile the code correctly. Seems Objection v3 is still in some pre-release state so this isn't quite documented yet.

GraphQL is a specification and it's common to see GraphQL over HTTP for queries and mutations, however with GraphQL subscriptions we need to receive continuous updates from an API. That's where WebSockets come in.

WebSockets are often used as a transport protocol for GraphQL Subscriptions. So, to answer your question, GraphQL Subscriptions aren't bound to any protocol. In fact, GraphQL queries and mutations aren't limited to HTTP either. Hence, WebSocket-based GraphQL Subscriptions libraries implement a small protocol over which they send GraphQL subscription operations and results.

Two notable implementations are:

• subscriptions-transport-ws which was made by the Apollo team (and hence does enjoy great support in Apollo Server) but isn't being actively maintained anymore
• graphql-ws which is a successor project (with slight incompatibilities). Its readme does explain how to add it to an Apollo Server.

These are just protocol libraries with a server-side and a client-side implementation to facilitate GraphQL operations and result being sent over WebSockets. They thus take a lot of the work away from you having to come up with your own protocol or implementing one on something other than WebSockets.

I had must used subccribe keyword for subs define. Thanks me. Subscription :{ userNotifications : withFilter( subccribe: ()=>pubSub.asyncIterator(NEW_NOTIFICATION_CREATE), (payload, variables)=>{ console.log("payload=>", payload); console.log("variables=>", variables); return true } )}}

I didn't find any solution or example to get client-socket from graphql subscription. In most example they use Gateway instead of graphql pubsub. So I used GateWay to implement real-time activities and graphql for other request.

follow https://medium.com/flawless-app-stories/gyp-no-xcode-or-clt-version-detected-macos-catalina-anansewaa-38b536389e8d.

it is issue about catalina

In a production environment, you'll typically want multiple instances that run on different servers to increase resiliency. This way, a single server failure won't necessarily impact availability. As your business and the resource demands on your server grow, it's also often easier and more cost effective to scale up horizontally by adding more servers than by adding more resources to your individual server.

The EventEmitters created by the basic PubSub implementation are tied to an individual processes. There's no way to share their usage across multiple processes, let alone different servers. So if you publish something, an application running on a different process or server will not be notified of the event. On the other hand, if you use the Redis implementation of PubSub (or pretty much any of the other ones), then Redis will serve as a "go-between" for your application instances -- each application will publish events to Redis and subscribe to it for changes.

I have gave up to use variables as I figured out that I can send parameters like query and mutation requests. So I have changed the request so that it now makes queries like this:

And also server accepts that parameter in the type definition of the subscriptions. Now the input parameters of the withFilter filter function (the second callback) are payload and variables which are respectively, data published by a mutation and data retrieved from the subscriber.

So now with the above request, current function works perfect: