AWS Dev Day Kyiv 2019 Track: Backend & Architecture Session: "How to build real-time backends" Speaker: Martin Beeby, AWS Principle Evangelist Level: 300 AWS Dev Day is a free, full-day technical event where new developers will learn about some of the hottest topics in cloud computing, and experienced developers can dive deep on newer AWS services. Provectus has organized AWS Dev Day Kyiv in close collaboration with Amazon Web Services: 800+ participants, 18 sessions, 3 tracks, a really AWSome Day!  Now, together with Zeo Alliance, we're building and nurturing AWS User Group Ukraine — join us on Facebook to stay updated about cloud technologies and AWS services: https://www.facebook.com/groups/AWSUserGroupUkraine Video: https://youtu.be/bsZYA6V3bDA

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K Y I V
11/06/2019
Cloud backend for real-time
applications
Martin Beeby @thebeebs
Developer Evangelist
AWS
B A R 5

2. @ t h e b e e b s
M a r t i n B e e b y
@ t h e b e e b s
A software developer since I was 16
Developer for 20 years
Work at Amazon Web Services
MARTIN BEEBY
@THEBEEBS
THEBEEBS.CO.UK/INCEPTION

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Agenda
What is Real-Time
Using Frameworks on AWS – SignalR
API Gateway and WebSocket's
Real-Time with AppSync

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Real-time all around us
- Banking alerts
- News story updates
- Multi-player games
- Chat applications
- Shared whiteboards
- AR/VR experiences
- Document collaboration
- Feedback

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Hotel Booking

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Document Collaboration

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Feedback

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Technology Evolution
Long
Polling
Forever
Frames
Server Sent
Events
Web
Sockets

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Without Real-Time

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With Real-Time

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What is SignalR
Popular .net Real-Time
framework.
ASP.NET Core SignalR
is an open-source
library that simplifies
adding real-time web
functionality to apps.
Real-time web
functionality enables
server-side code to
push content to clients
instantly.
Supports, WS, SSE,
Long Polling and
degrades based upon
server and client
abilities

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Add SignalR to Services

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Add SignalR Route to app

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Publish to Amazon Elastic Beanstalk

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Publish to Amazon Elastic Beanstalk

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Publish to Amazon Elastic Beanstalk
services.AddSignalR()
.AddStackExchangeRedis(connectionString, options
=> { options.Configuration.ChannelPrefix =
"MyApp"; });

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Programming Model

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Connecting to the API

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Client to Server Messaging

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Server to client Messaging

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Connection URL Options

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Realtime Chat

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{
"action": "sendmessage",
"data " : "Hello, Kyiv."
}

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
AWS AppSync
AWS AppSync is a managed service for application data using GraphQL
with real-time capabilities and an offline programming model
Real-time
collaboration
Offline programming
model with sync
Flexible database
options
Fine-grained
access control

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
GraphQL Subscriptions
mutation addPost( id:123
title:"New post!"
author:"Nadia"){
id
title
author
}
data: [{
id:123,
title:"New Post!"
author:"Nadia"
}]
Near Realtime updates of data
Event based mode, triggered by Mutations
• Scalable model, designed as a platform for common use-cases
• Subscription arguments can filter what to receive
Can be used with ANY data source in AppSync
• Such as Lambda, DynamoDB, Elasticsearch, HTTP Endpoints

37. @ t h e b e e b s
M a r t i n B e e b y
Schema Directives
subscription NewPostSub {
addedPost {
__typename
version
title
content
author
url
}
}
type Subscription {
addedPost: Post
@aws_subscribe(mutations: ["addPost"])
deletedPost: Post
@aws_subscribe(mutations: ["deletePost"])
}
type Mutation {
addPost(id: ID! author: String! title:
String content: String): Post!
deletePost(id: ID!): Post!
}

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What we looked at
What is Real-Time
Using Frameworks on AWS – SignalR
API Gateway and WebSocket's
Real-Time with AppSync

41. Thank you!
© 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Martin Beeby
@thebeebs