apollo-server_graphql-modules_subscriptions

The server side implementation of Graphql subscription with apollo-server and Graphql Modules.

If you are using apollo-server-koa, checkout the koa branch.

HOW TO START

clone the repository

  git clone git@github.com:dancon/apollo-server_graphql-modules_subscriptions.git

install the dependencies

  cd apollo-server_graphql-modules_subscriptions

  npm i

start the project in debug mode in VSCode or just excute the command below

  npm start

Demonstrate

open http://localhost:4000/graphql in your browser, you will see the graphql playground, and excute oprations below in different tabs.

Subscription

  subscription {
    indicatorUpdated (psm: "ts") {
      host
      risk
    }
  }

Mutation

  mutation {
    updateIndicators (psm: "t1", payload: [ { host: "t1", risk: false } ]) {
      host
      risk
    }
  }

NEED TO KNOW

Make sure the versions of @graphql-modules/core and @graphql-modules/di is 0.7.1 or higher
when use Subscription transformation, you must keep the reture type of resolve function in correspondence with the definition in the schema.

resolvers.ts

  Subscription: {
    indicatorUpdated: {
      resolve(payload) {
        console.log('subscription transformation:', payload)

        // the reture type MUST be in correspondence with the definition in the schema.
        return [
          {
            host: '改了',
            risk: false
          }
        ]
      },
      subscribe: (_, __, { injector }: ModuleContext) => injector.get(PubSub).asyncIterator(['indicatorUpdated'])
    }
  }