Real-Time Serverless Back Ends with GraphQL

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What is GraphQL? Open, declarative data-fetching specification != Graph database Use NoSQL, Relational, HTTP, etc. Traditional data-fetching GraphQL /posts /postInfo /postJustTitle /postsByAuthor /postNameStartsWithX /commentsOnPost

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How does GraphQL work? { "id": "1", "name": "Get Milk", “priority": "1" }, { "id": “2", "name": “Go to gym", “priority": “5" },… type Query { getTodos: [Todo] } type Todo { id: ID! name: String description: String priority: Int duedate: String } query { getTodos { id name priority } } Model data with application schema Client requests what it needs Only that data is returned

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. GraphQL Schema type Event { id: ID! name: String where: String when: String description: String comments: [Comment] } type Comment { commentId: String! eventId: ID! content: String! createdAt: String! }

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. GraphQL Schema Mutation type Mutation { createEvent( name: String!, when: String!, where: String!, description: String! ): Event deleteEvent(id: ID!): Event commentOnEvent( eventId: ID!, content: String!, createdAt: String! ): Comment }

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. GraphQL Schema Mutation Query type Query { getEvent(id: ID!): Event listEvents( limit: Int, nextToken: String ): EventConnection }

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. GraphQL Schema Mutation Query Subscription type Subscription { subscribeToEventComments(eventId: String!): Comment @aws_subscribe(mutations: ["commentOnEvent"]) }

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Can you do … with GraphQL? Realtime? YES Batching? YES Pagination? YES Relations? YES Aggregations? YES Search? YES Offline? YES

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. AWS AppSync DynamoDB Table Lambda Function Elasticsearch Service GraphQL Schema Upload Schema GraphQL Query Mutation Subscription Real-time Offline DynamoDB to Elasticsearch Sync Function AppSync API Cognito User Pool

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© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. AWS AppSync DynamoDB Table Lambda Function Elasticsearch Service GraphQL Schema Autogenerate Schema GraphQL Query Mutation Subscription Real-time Offline DynamoDB to Elasticsearch Sync Function AppSync API Cognito User Pool