AWS AppSync

• AppSync is a managed service which uses GraphQL
• It is used for building APIs on AWS which use GraphQL
• GraphQL makes it easy for applications to get the exact data they need. This includes combining data from multiple resources
• Datasets behind GraphQL can include:
  • NoSQL data stores
  • RDS databases
  • HTTP APIs
  • etc.
• AppSync integrates with (resolvers) DynamoDB, Aurora, ElasticSearch, etc.
• Supports customer resources using Lambda
• Provides support for real time data retrieval using WebSocket or MQTT on WebSocket protocols
• Mobile applications: replacement for Cognito Sync
• Requires a GraphQL schema for getting started

• Example for GraphQL schema:

    type Query {
        human(id: ID!): Human
    }
  
    type Human {
        name: String
        appearsIn: [Episode]
        starships: [Starship]
    }
  
    enum Episode {
        NEWHOPE
        EMPIRE
        JEDI
    }
  
    type Starship {
        name: String
    }
  

Security

• Four ways we can authorize applications to interact with AppSync:
  • API_KEY
  • AWS_IAM
  • OPENID_CONNECT (OpenID Connect provider/ JWT)
  • AMAZON_COGNITO_USER_POOLS
• For custom domain & HTTPS, use CloudFront in front of AppSync