Deploying a GraphQL Server with Firebase Functions

firebase-graphql-with-data.js

// sample graphql server deployed with firebase functions
// pulling some basic stockmarket data from a firebase db
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const express = require('express');
const graphqlHTTP = require('express-graphql');
const values = require('lodash.values');
const { GraphQLSchema, GraphQLObjectType, GraphQLList, GraphQLString } = require('graphql');

// Init express
const app = express();

// Init Firebase admin
admin.initializeApp(functions.config().firebase);

// connect to db
const db = admin.database();
const ref = db.ref('poll');

// Construct Securities Type
const SecurityType = new GraphQLObjectType({
  name: 'Security',
  description: 'A stock market security',
  fields: () => ({
    symbol: { type: GraphQLString },
    name: { type: GraphQLString },
    open: { type: GraphQLString },
    last: { type: GraphQLString },
    percDay: { type: GraphQLString },
    status: { type: GraphQLString },
    volume: { type: GraphQLString },
    lastUpdatedAt: { type: GraphQLString },
  }),
});

// Construct root query
const query = new GraphQLObjectType({
  name: 'Query',
  description: 'The Root Query',
  fields: () => ({
    securities: {
      type: new GraphQLList(SecurityType),
      description: 'A list of all securities',
      resolve() {
        return ref.child('securities').once('value').then(data => {
          return values(data.val());
        });
      },
    },
  }),
});

// Construct the schema
const schema = new GraphQLSchema({
  query,
});

app.use('/', graphqlHTTP({
  schema,
  graphiql: true,
}));

exports.graphql = functions.https.onRequest(app);

I know you've uploaded this a long time ago but I'm trying to use this now and get an error. If you've ever encountered this I'd love to hear how you worked around it.

Error: listen EADDRINUSE: address already in use :::8080 
at Server.setupListenHandle [as _listen2] (net.js:1280:14) 
at listenInCluster (net.js:1328:12) 
at Server.listen (net.js:1415:7) 
at Object.<anonymous> (/layers/google.nodejs.functions-framework/functions-framework/node_modules/@google-cloud/functions-framework/build/src/index.js:85:8) 
at Module._compile (internal/modules/cjs/loader.js:778:30) 
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10) 
at Module.load (internal/modules/cjs/loader.js:653:32) 
at tryModuleLoad (internal/modules/cjs/loader.js:593:12) 
at Function.Module._load (internal/modules/cjs/loader.js:585:3) 
at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)