template.yaml

AWSTemplateFormatVersion: "2010-09-09"
Transform: "AWS::Serverless-2016-10-31"
Description: AppSync Broadcaster
Metadata:
  AWS::ServerlessRepo::Application:
    Name: appsync-broadcaster
    Description: Simple app that broadcasts messages to multiple clients using Serverless GraphQL real-time subscriptions powered by AWS AppSync
    Author: awsed
    SpdxLicenseId: MIT
    LicenseUrl: LICENSE.txt
    ReadmeUrl: README.md
    Labels: ['appsync', 'graphql', 'real-time', 'react', 'amplify']
    HomepageUrl: https://github.com/awsed/appsync-broadcaster-sar
    SemanticVersion: 1.0.0
    SourceCodeUrl: https://github.com/awsed/appsync-broadcaster-sar
Outputs:
  ApiId:
    Description: Unique AWS AppSync GraphQL API Identifier
    Value: !GetAtt broadcasterApi.ApiId
  ApiUrl:
    Description: The Endpoint URL of your GraphQL API
    Value: !GetAtt broadcasterApi.GraphQLUrl
  Region:
    Description: Region where the resources are deployed
    Value: !Ref AWS::Region
  ApiKey:
    Description: The API Key to access your API
    Value: !GetAtt apiKey.ApiKey
Resources:
  broadcasterApi:
    Type: "AWS::AppSync::GraphQLApi"
    Properties:
      Name: "BroadcasterSAR"
      AuthenticationType: "API_KEY"
  apiKey:
    Type: "AWS::AppSync::ApiKey"
    Properties:
      ApiId: !GetAtt broadcasterApi.ApiId
  pubSubDataSource:
    Type: "AWS::AppSync::DataSource"
    Properties:
      Type: NONE
      Description: "Local Resolver"
      ApiId: !GetAtt broadcasterApi.ApiId
      Name: PubSub
  schema:
    Type: "AWS::AppSync::GraphQLSchema"
    Properties:
      ApiId: !GetAtt broadcasterApi.ApiId
      Definition: |
        schema {
          query: Query
          mutation: Mutation
          subscription: Subscription
        } 

        type Message {
          message: String!
        }

        type Mutation {
          sendMessage(message: String!): Message
        }

        type Query {
          getMessage: Message
        }

        type Subscription {
          subscribeToMessage: Message
            @aws_subscribe(mutations: ["sendMessage"])
        }
  pubSubResolver:
    Type: "AWS::AppSync::Resolver"
    Properties:
      ApiId: !GetAtt broadcasterApi.ApiId
      TypeName: "Mutation"
      FieldName: "sendMessage"
      DataSourceName: !GetAtt pubSubDataSource.Name
      RequestMappingTemplate: |
        {
            "version": "2017-02-28",
            "payload": {
                "message": "${context.arguments.message}",
                "sentAt": "$util.time.nowISO8601()"
            }
        }
      ResponseMappingTemplate: |
        $util.toJson($context.result)