serverless.yml

service:
  name: websocket-chat

plugins:
  - serverless-webpack

provider:
  name: aws
  stage: ${env:NODE_ENV, "development"}
  region: ${env:AWS_REGION}
  runtime: nodejs12.x
  iamRoleStatements:
    - Effect: "Allow"
      Action:
        - "dynamodb:PutItem"
        - "dynamodb:DeleteItem"
        - "dynamodb:Scan"
      Resource:
        - Fn::Join:
            - ""
            - - Fn::GetAtt: [ConnectionTable, Arn]
              - "*"

functions:
  connect:
    handler: handler.connect
    events:
      - websocket:
          route: $connect
  disconnect:
    handler: handler.disconnect
    events:
      - websocket:
          route: $disconnect
  broadcast:
    handler: handler.broadcast
    events:
      - websocket:
          route: $default

resources:
  Resources:
    ConnectionTable:
      Type: AWS::DynamoDB::Table
      Properties:
        TableName: ${env:CONNECTION_TABLE_NAME, "ConnectionIds"}
        AttributeDefinitions:
          - AttributeName: connectionId
            AttributeType: S
        KeySchema:
          - AttributeName: connectionId
            KeyType: HASH
        ProvisionedThroughput:
          ReadCapacityUnits: 5
          WriteCapacityUnits: 5