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AWS::Serverless: :API GraphQL

Use o tipo de AWS::Serverless::GraphQLApi recurso AWS Serverless Application Model (AWS SAM) para criar e configurar uma AWS AppSync GraphQL API para seu aplicativo sem servidor.

Para saber mais AWS AppSync, consulte O que é AWS AppSync? no Guia do AWS AppSync desenvolvedor.

Sintaxe

YAML

LogicalId:
  Type: AWS::Serverless::GraphQLApi
  Properties:
    ApiKeys: ApiKeys
    Auth: Auth
    Cache: AWS::AppSync::ApiCache
    DataSources: DataSource
    DomainName: AWS::AppSync::DomainName
    Functions: Function
    Logging: LogConfig
    Name: String
    Resolvers: Resolver
    SchemaInline: String
    SchemaUri: String
    Tags:
    - Tag
    XrayEnabled: Boolean

Propriedades

Valores de retorno

Para obter uma lista dos valores de retorno, consulte o AWS::Serverless::GraphQLApi no Guia do usuário do CloudFormation.

Exemplos

API DO GraphQL com a fonte de dados do DynamoDB

Neste exemplo, criamos uma API GraphQL que usa uma tabela do DynamoDB como fonte de dados.

schema.graphql

schema {
  query: Query
  mutation: Mutation
}

type Query {
  getPost(id: String!): Post
}

type Mutation {
  addPost(author: String!, title: String!, content: String!): Post!
}

type Post {
  id: String!
  author: String
  title: String
  content: String
  ups: Int!
  downs: Int!
  version: Int!
}

template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
...
Resources:
  DynamoDBPostsTable:
    Type: AWS::Serverless::SimpleTable

  MyGraphQLAPI:
    Type: AWS::Serverless::GraphQLApi
    Properties:
      SchemaUri: ./sam_graphql_api/schema.graphql
      Auth:
        Type: AWS_IAM
      DataSources:
        DynamoDb:
          PostsDataSource:
            TableName: !Ref DynamoDBPostsTable
            TableArn: !GetAtt DynamoDBPostsTable.Arn
      Functions:
        preprocessPostItem:
          Runtime:
            Name: APPSYNC_JS
            Version: 1.0.0
          DataSource: NONE
          CodeUri: ./sam_graphql_api/preprocessPostItem.js
        createPostItem:
          Runtime:
            Name: APPSYNC_JS
            Version: "1.0.0"
          DataSource: PostsDataSource
          CodeUri: ./sam_graphql_api/createPostItem.js
        getPostFromTable:
          Runtime:
            Name: APPSYNC_JS
            Version: "1.0.0"
          DataSource: PostsDataSource
          CodeUri: ./sam_graphql_api/getPostFromTable.js
      Resolvers:
        Mutation:
          addPost:
            Runtime:
              Name: APPSYNC_JS
              Version: "1.0.0"
            Pipeline:
            - preprocessPostItem
            - createPostItem
        Query:
          getPost:
            CodeUri: ./sam_graphql_api/getPost.js
            Runtime:
              Name: APPSYNC_JS
              Version: "1.0.0"
            Pipeline:
            - getPostFromTable

createPostItem.js

import { util } from "@aws-appsync/utils";

export function request(ctx) {
  const { key, values } = ctx.prev.result;
  return {
    operation: "PutItem",
    key: util.dynamodb.toMapValues(key),
    attributeValues: util.dynamodb.toMapValues(values),
  };
}

export function response(ctx) {
  return ctx.result;
}

getPostFromTable.js

import { util } from "@aws-appsync/utils";

export function request(ctx) {
  return dynamoDBGetItemRequest({ id: ctx.args.id });
}

export function response(ctx) {
  return ctx.result;
}

/**
 * A helper function to get a DynamoDB item
 */
function dynamoDBGetItemRequest(key) {
  return {
    operation: "GetItem",
    key: util.dynamodb.toMapValues(key),
  };
}

pré-processar PostItem.js

import { util } from "@aws-appsync/utils";

export function request(ctx) {
  const id = util.autoId();
  const { ...values } = ctx.args;
  values.ups = 1;
  values.downs = 0;
  values.version = 1;
  return { payload: { key: { id }, values: values } };
}

export function response(ctx) {
  return ctx.result;
}

Aqui está nosso código de resolução:

getPost.js

export function request(ctx) {
  return {};
}

export function response(ctx) {
  return ctx.prev.result;
}

GraphQL API com uma função de evento Lambda como fonte de dados

Neste exemplo, criamos uma GraphQL API que usa uma função de evento Lambda como fonte de dados.

template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
...
Resources:
  MyLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: index.handler
      Runtime: nodejs20.x
      CodeUri: ./lambda

  MyGraphQLAPI:
    Type: AWS::Serverless::GraphQLApi
    Properties:
      Name: MyApi
      SchemaUri: ./gql/schema.gql
      Auth:
        Type: API_KEY
      ApiKeys:
        MyApiKey:
          Description: my api key
      DataSources:
        Lambda:
          MyLambdaDataSource:
            FunctionArn: !GetAtt MyLambdaFunction.Arn
      Functions:
        lambdaInvoker:
          Runtime:
            Name: APPSYNC_JS
            Version: 1.0.0
          DataSource: MyLambdaDataSource
          CodeUri: ./gql/invoker.js
      Resolvers:
        Mutation:
          addPost:
            Runtime:
              Name: APPSYNC_JS
              Version: 1.0.0
            Pipeline:
            - lambdaInvoker
        Query:
          getPost:
            Runtime:
              Name: APPSYNC_JS
              Version: 1.0.0
            Pipeline:
            - lambdaInvoker

Outputs:
  MyGraphQLAPI:
    Description: AppSync API
    Value: !GetAtt MyGraphQLAPI.GraphQLUrl
  MyGraphQLAPIMyApiKey:
    Description: API Key for authentication
    Value: !GetAtt MyGraphQLAPIMyApiKey.ApiKey

schema.graphql

schema {
  query: Query
  mutation: Mutation
}
type Query {
  getPost(id: ID!): Post
}
type Mutation {
  addPost(id: ID!, author: String!, title: String, content: String): Post!
}
type Post {
  id: ID!
  author: String!
  title: String
  content: String
  ups: Int
  downs: Int
}

Aqui estão nossas funções:

lambda/index.js

exports.handler = async (event) => {
  console.log("Received event {}", JSON.stringify(event, 3));

  const posts = {
    1: {
      id: "1",
      title: "First book",
      author: "Author1",
      content: "Book 1 has this content",
      ups: "100",
      downs: "10",
    },
  };

  console.log("Got an Invoke Request.");
  let result;
  switch (event.field) {
    case "getPost":
      return posts[event.arguments.id];
    case "addPost":
      // return the arguments back
      return event.arguments;
    default:
      throw new Error("Unknown field, unable to resolve " + event.field);
  }
};

invoker.js

import { util } from "@aws-appsync/utils";

export function request(ctx) {
  const { source, args } = ctx;
  return {
    operation: "Invoke",
    payload: { field: ctx.info.fieldName, arguments: args, source },
  };
}

export function response(ctx) {
  return ctx.result;
}