openapi-to-graphql-nullable/test/example_gql_server_ws.js

Fork of openapi-to-graphql that fixes nullable handling. Published to NPM since there's no other easy way to consume a Lerna package. Unmaintained.

const express = require('express')
const { graphqlHTTP } = require('express-graphql')
const { execute, printSchema, subscribe } = require('graphql')
const { createServer } = require('http')
const { SubscriptionServer } = require('subscriptions-transport-ws')
const { MQTTPubSub } = require('graphql-mqtt-subscriptions')
const { connect } = require('mqtt')
const openAPIToGraphQL = require('../lib/index')

const oas5 = require('./fixtures/example_oas5.json')

const HTTP_PORT = 3000
const app = express()

openAPIToGraphQL
  .createGraphQLSchema(oas5, {
    fillEmptyResponses: true,
    createSubscriptionsFromCallbacks: true
  })
  .then(({ schema, report }) => {
    console.log(JSON.stringify(report, null, 2))
    const myGraphQLSchema = printSchema(schema)
    console.log(myGraphQLSchema)

    const client = connect(`mqtt://localhost:1885`, {
      keepalive: 60,
      reschedulePings: true,
      protocolId: 'MQTT',
      protocolVersion: 4,
      reconnectPeriod: 2000,
      connectTimeout: 5 * 1000,
      clean: true
    })

    const pubsub = new MQTTPubSub({
      client
    })

    app.use(
      '/graphql',
      graphqlHTTP({
        schema,
        graphiql: true,
        subscriptionsEndpoint: `ws://localhost:${HTTP_PORT}/subscriptions`,
        context: { pubsub }
      })
    )

    const server = createServer(app)

    server.listen(HTTP_PORT, () => {
      console.log(`Running a GraphQL API server at :`)
      console.log(`http://localhost:${HTTP_PORT}/graphql`)
      console.log(`ws://localhost:${HTTP_PORT}/subscriptions`)

      new SubscriptionServer(
        {
          execute,
          subscribe,
          schema,
          onConnect: (params, socket, ctx) => {
            // Add pubsub to subscribe context
            return { pubsub }
          }
        },
        {
          server,
          path: '/subscriptions'
        }
      )
    })
  })
  .catch((err) => {
    console.log(err)
  })