graphql-aws-iot-client

WS client for serverless subscriptions queries and mutations that is compatible with Apollo Client and graphql-aws-iot-server.

Adapted from the Apollo Subscriptions Ws Transport

apollo module - setting up client in Angular 2 and up example:

Please note that this client will not work with the angular cli. You can either eject from the cli or use your own custom configuration. The angular cli strips out crypto in its build flow and crypto is required to sign the mqtt ws url for aws iot.

If you are using angular 2 and up you can import the client directly from 'graphql-aws-iot-client/src' to use the typescript code directly rather than the compiled code.

import { Inject } from '@angular/core';
import { NgModule } from '@angular/core';

import { ApolloModule } from 'apollo-angular';
import { ApolloClient } from 'apollo-client';

import { SubscriptionClient } from 'graphql-aws-iot-client/src';

import { getCredentialsFunction } from './get-credentials';

import { environment } from '../../environments/environment';
const { region, iotEndpoint, AppPrefix } = environment;


const wsClient = new SubscriptionClient(iotEndpoint, {
    appPrefix: AppPrefix, // used as a topic prefix to namespace app
    region, // required to create signed url (should be region of iotEndpoint url
    reconnect: true,
    getCredentialsFunction,
    debug: true // for logging of socket messages
});

const client: ApolloClient = new ApolloClient({
    dataIdFromObject: (o: any) => o.id,
    networkInterface: wsClient,
    connectToDevTools: true,
});

export function provideClient(): ApolloClient {
    return client;
}

@NgModule({
    imports: [ApolloModule.forRoot(provideClient)],
    exports: [ApolloModule]
})
export class AppApolloModule { }

The getCredentials function must be provided so that on every new connection a new signed url will be generated to connect to the socket. This will ensure that the credentials are not expired on reconnect. This function should return a promise with AWS Credentials.

See full example app at

Source Code Demo Code

Demo URL Demo URL