Introduction to AWS
AppSync
A Powerful and Serverless ⚡ GraphQL solution
Serverless Brno #1 - 24/11/2021 https://unsplash.com/photos/ZdiTUdJ3KBU

About me
● Serverless Developer At Serverless Guru
● Using Serverless Since 2018
● AWS Community Builder
● Contributor & maintainer of the
appsync plugin & simulator for the
Serverless Framework
● @Benoit_Boure
● https://github.com/bboure
● https://benoitboure.com/

Topics
- Into to GraphQL
- AWS AppSync

GraphQL

GraphQL
- Query language for APIs
- Explore your data as a graph
- GraphQL !== Graph Database

Traditional (REST) APIs
/users/1
/addresses/456
/images/123

GraphQL

Schema
- Base of GraphQL
- Defines shape, type of the data
- It validates the data at runtime

Types of queries
Queries Mutations Subscriptions

AWS AppSync

What is AWS AppSync (and why you should use it)?
- Fully managed GraphQL service by AWS
- It’s Serverless! (Don’t pay for idle)
- It scales!

Principal aspects and features of AWS AppSync
- Data Sources
- Resolvers (+Pipeline Resolvers)
- Authentication & Authorization
- Subscriptions (Real-time pub/sub)
- Cache

Data sources
DynamoDB OpenSearch
(ElasticSearch)
Aurora
Lamda HTTP None
(Local resolver)

Resolvers
DynamoDB
Lamda

Pipeline resolvers
Lamda DynamoDB GraphQL
AppSync

Authentication & Authorization
Lamda
API Key
OIDC
IAM
Cognito

Subscriptions
Source: https://aws.amazon.com/blogs/mobile/appsync-realtime/

Cache
- In-memory caching capability
- Full request or per-resolver
- Caching keys
- TTL: up to 1 hour

Limitations
- No custom scalars
- No custom domain (There are workarounds, but again, with limitations)
- No schema federation
- Not compliant with the latest GraphQL specs (June 2018)

Development
- Purple stack 💜!
Client-side libraries
- AmplifyJS
- Apollo Client
- graphql-code-generator
Deployment
- Amplify CLI
- AWS SAM
- CDK
- Serverless Framework
- CloudFormation
Developer tools

Thank you!
Děkuji!