graphql-aws-lamba-example

An example Task board API demonstrating how to use the graphql-aws-lambda library

It does not include any user validation with something like cognito. The authorization header just accepts the value as the user id.

Deploying

• Run mvn package to create fat jar.
• Upload to an s3 bucket
• cf.json is a cloud formation script that can then be used to setup the environment
• can then look at the aws api gateway to find the urls to connect to

Running locally

Can be run locally by starting the VertxRunner main method. Will need to have setup a compatible dynamo table would suggest starting with AWS deployment as will create dynamo tables

Connecting the apollo client

Example connection information for apollo client, Chrome does sometimes have some header issues with the AWS websocket but below code works with chrome

import ApolloClient from 'apollo-client';
import { WebSocketLink } from "apollo-link-ws";
import { split } from 'apollo-link';
import { HttpLink } from 'apollo-link-http';
import { InMemoryCache } from 'apollo-boost';
import {SubscriptionClient} from 'subscriptions-transport-ws'

// Create an http link:
const httpLink = new HttpLink({
  uri: 'https://....execute-api.region.amazonaws.com/...',
  headers: {
    'Authorization': ...
  }
});

// Create a WebSocket link:
const wsLink = new WebSocketLink(new SubscriptionClient(`wss://....execute-api.region.amazonaws.com/...`, {
  reconnect: true,
  connectionParams: async () => {
    return {
      Authorization: ...
    }
  }
}, undefined, []));

const link = split(
  // split based on operation type
  ({ query }) => {
    const definition = getMainDefinition(query);
    return (
      definition.kind === 'OperationDefinition' &&
      definition.operation === 'subscription'
    );
  },
  wsLink,
  httpLink
);

const gqlClient = new ApolloClient(
  {
      link: link,
      cache: new InMemoryCache()
  }
)

Insomnia example workspace

Insomnia_workspace.json has examples of the graphql endpoints being called.