appsync.md

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