AppSync

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AppSync

About

• It is a managed service, that helps to built GraphQL APIs.

• GraphQL makes it easy for application to get exactly the data they need, using GraphQL queries (another way of making API).

• This includes combining data from one or more sources.

  • NoSQL data stores, Relational database, HTTP APIs.

  • It integrates with DynamoDB, Aurora, OpenSearch and others.

  • Custom sources can also used with AWS Lambda.

• Retrieve data in real-time with WebSocket or MQTT on Websocket.

• For mobile apps if you need local data access and data synchronization, (its basically a replacement for Cognito Sync)

• GraphQL schema is required to get started with AppSync.

• For custom domain && HTTPs, use CloudFront in front of AppSync.

Working

• AppSync receives GraphQL queries send by clients and forwards it to resolver like DynamoDb resolver.

• AppSync knows how to return all the query details as per query in json form.

AppSync Working

Integration Diagram

• Different integrations possible with AppSync.

  

  Integration

Security

• There are four ways one can authorize applications to interact with your AWS AppSync GraphQL API.

  • API KEY

  • AWS IAM : Use roles, users, cross-account access

  • OPENID_CONNECT : Using OpenID connect provider/JSON Web Token

  • AMAZON_COGNITO_USER_POOLS

  • Lambda authorizor

Caching

• API Responses can be cached. Three types of caching are supported.

  • No Cache

  • Full request cache

  • Per-resolver cache

Monitoring

• Appsync is integrated with CloudWatch and captures logs and metrics.

• A dashboard capturing metrics is available.