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/*** UTILITY ------------------------------------------ ***/
import {
executeSchema,
gql,
GraphQLHTTP,
GraphQLWS,
PubSub
} from "./entry.ts";
const pubsub = new PubSub();
const schema = executeSchema({
resolvers: {
Mutation: {
ping: (_: unknown, { msg }: { msg: string }) => {
pubsub.publish("PING", { pinged: msg });
return msg;
}
},
Query: {
hello: () => "world"
},
Subscription: {
pinged: {
subscribe: () => pubsub.asyncIterator(["PING"])
}
}
},
typeDefs: gql`
type Query { hello: String }
type Mutation { ping(msg: String!): String }
type Subscription { pinged: String }
`
});
const subscriptions = GraphQLWS({ schema });
const handler = GraphQLHTTP({
graphiql: true,
playgroundOptions: { title: "Subscriptions Example" },
schema,
subscriptions
});
/*** PROGRAM ------------------------------------------ ***/
Deno.serve({ port: 4000 }, handler);
setInterval(() => {
pubsub.publish("PING", { pinged: `tick @ ${new Date().toISOString()}` });
}, 2000);
/*** deno run -A subscription-example.ts ***/
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