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Go realtime with GraphQL Subscriptions
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Pierre Renaudin
September 05, 2017
Technology
1
130
Go realtime with GraphQL Subscriptions
Meetup GraphQL Paris - @ eFounders
5 September 2017
Pierre Renaudin
September 05, 2017
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Transcript
GraphQL Meetup Go realtime with subscriptions
Y U NO realtime?
Concept
Subscriptions Concept • Channel based events • Usage of GraphQL
Schema • Connection • Subscription
Subscriptions Concept • Events based • Usage of GraphQL Schema
• Connection • Subscription type Channel { id: ID! createdAt: Date! name: String! isFavorite: Boolean! } extend type Subscription { channelCreated: Channel! channelUpdated: Channel! channelDeleted: Channel! }
MIND. BLOWN.
Server-side
None
None
SubscriptionServer • Track Client • Send keep-alive • Execute our
GraphQL Schema • Manage connections
Pubsub • Object to publish data • Use to aggregate
events • Use to filtering before sending data • Can use Redis or InMemory or RabbitMQ
Filters and Permissions Publish event with data and audience Resolve
subscription and filter to allowed users
Client-side
- React Relay: Easy and straightforward - Apollo: Not tied
up with React with special packages for React, Angular etc…
- React Relay: Easy and straightforward - Apollo: Not tied
up with React with special packages for React, Angular etc…
import { SubscriptionClient, addGraphQLSubscriptions } from 'subscriptions-transport-ws' const
networkInterface = createNetworkInterface({ uri: 'https://api.graph.cool/simple/v1/<project-id>' }) const wsClient = new SubscriptionClient('__SUBSCRIPTION_API_ENDPOINT__', { reconnect: true, }) const networkInterfaceWithSubscriptions = addGraphQLSubscriptions( networkInterface, wsClient ) const client = new ApolloClient({ networkInterface: networkInterfaceWithSubscriptions }) Apollo Setup
None
Listen and receive data _subscribeToNewChannels = () => { this.props.channelsQuery.subscribeTo({
document: gql` subscription { channelCreated { id createdAt name isFavorite } } `, updateQuery: (previous, { subscriptionData }) => { // Dispatch your subscription data :) } }) }
« It just works ™ » Arnaud Rinquin 9 Juin
2017
DEMO
Go further How to - https://www.howtographql.com/react-apollo/8-subscriptions/ RFC - https://github.com/facebook/graphql/blob/master/rfcs/Subscriptions.md Demo
- https://blog.graph.cool/how-to-build-a-real-time-chat-with-graphql- subscriptions-and-apollo-d4004369b0d4
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