Apollo 2.x graphIQL Can't Reach Subscription? - graphql

Question

My Apollo queries and mutations are working perfectly. Now I'm adding a subscription and for some reason graphIql (please note the I in graphIql) can't trigger the subscription. A breakpoint in the subscription doesn't activate, and the data comes back to graphIql as null. There are no console log errors in graphIql.
Here's the relevant code:
TYPES
type Resolution {
_id: String!
name: String!
goals: [Goal]
completed: Boolean
}
type Query {
resolutions: [Resolution]
getResolutionViaId(resolutionId: String!): Resolution
}
type Mutation {
createResolution(name: String!): Resolution
}
type Subscription {
resolutionWasAdded: Resolution
}
RESOLVERS
Subscription: {
resolutionWasAdded: {
subscribe: () => pubsub.asyncIterator(RESOLUTION_SUBSCRIPTION_TOPIC)
}
}
QUERY ENTERED IN GRAPHIQL
subscription resolutionWasAdded {
resolutionWasAdded {
__typename
_id
name
completed
}
}
RESPONSE IN GRAPHIQL
{
"data": {
"resolutionWasAdded": null
}
}
What could I be missing?
UPDATE
I see I need to set up graphIql to be aware of my subscription endpoint. I've googled quite a bit but don't yet see how to do it with this client setup:
import React from "react";
import {Meteor} from "meteor/meteor";
import {render} from "react-dom";
import {ApolloProvider} from "react-apollo";
import {ApolloLink, from} from "apollo-link";
import {ApolloClient} from "apollo-client";
import {HttpLink} from "apollo-link-http";
import {InMemoryCache} from "apollo-cache-inmemory";
import {onError} from 'apollo-link-error';
import {split} from 'apollo-link';
import {WebSocketLink} from 'apollo-link-ws';
import {getMainDefinition} from 'apollo-utilities';
import {toIdValue} from 'apollo-utilities';
import App from "../../ui/App";
// Create an http link:
const httpLink = new HttpLink({
uri: Meteor.absoluteUrl("graphql"),
credentials: 'same-origin'
})
// Create a WebSocket link:
const wsLink = new WebSocketLink({
uri: `ws://localhost:3200/subscriptions`,
options: {
reconnect: true
}
});
// using the ability to split links, you can send data to each link
// depending on what kind of operation is being sent
const splitLink = split(
// split based on operation type
({query}) => {
const {kind, operation} = getMainDefinition(query);
return kind === 'OperationDefinition' && operation === 'subscription';
},
wsLink,
httpLink,
);
const authLink = new ApolloLink((operation, forward) => {
const token = Accounts._storedLoginToken();
operation.setContext(() => ({
headers: {
"meteor-login-token": token
}
}));
return forward(operation);
});
const client = new ApolloClient({
link: ApolloLink.from([
onError(({graphQLErrors, networkError}) => {
if (graphQLErrors)
graphQLErrors.map(({message, locations, path}) =>
console.log(
`[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`,
),
);
if (networkError) console.log(`[Network error]: ${networkError}`);
}),
authLink,
splitLink,
]),
cache: new InMemoryCache({})
});
const ApolloApp = () => (
<ApolloProvider client={client}>
<App/>
</ApolloProvider>
);
Meteor.startup(() => {
render(<ApolloApp/>, document.getElementById("app"));
});
What is the correct way to modify this setup so as to tell graphIql about the subscription endpoint?