Getting started with `serverless-cqrs` -  part 3 - serverless.yml

serverless.yml

service: myService

## define some static variables
custom:
  writeModelTableName: commitsByEntityIdAndVersion
  writeModelIndexName: indexByEntityNameAndCommitId
  readModelDomainName: readmodel

provider:
  name: aws
  runtime: nodejs8.10
  ## make these values available in process.env
  environment:
    WRITE_MODEL_TABLENAME: ${self:custom.writeModelTableName}
    WRITE_MODEL_INDEXNAME: ${self:custom.writeModelIndexName}
    ELASTIC_READ_MODEL_ENDPOINT:
      Fn::GetAtt:
        - ReadModelProjections
        - DomainEndpoint 

  ## allow our lambda functions to access to following resources
  iamRoleStatements:
    - Effect: Allow
      Action:
        - "dynamodb:*"
      Resource: "arn:aws:dynamodb:*:*:table/${self:custom.writeModelTableName}*"
    - Effect: "Allow"
      Action:
        - "es:*"
      Resource:
        - "arn:aws:es:*:*:domain/${self:custom.readModelDomainName}/*"  
    - Effect: "Allow"
      Action:
        - "es:ESHttpGet"
      Resource:
        - "*"   

## create the following API Gateway endpoints and connect them to our app
functions:    
  router:
    handler: index.handler
    events:
      - http: POST
      - http: GET {id}
      - http: PUT {id}/{index}
      - http: DELETE {id}

resources:
  Resources:
    ## create the dynamodb table for storing events
    EventStoreTable:
      Type: 'AWS::DynamoDB::Table'
      Properties:
        TableName: ${self:custom.writeModelTableName}
        AttributeDefinitions: 
          - AttributeName: entityId
            AttributeType: S
          - AttributeName: version
            AttributeType: N
          - AttributeName: entityName
            AttributeType: S
          - AttributeName: commitId
            AttributeType: S
        KeySchema:
          - AttributeName: entityId
            KeyType: HASH
          - AttributeName: version
            KeyType: RANGE
        ProvisionedThroughput:
          ReadCapacityUnits: 5
          WriteCapacityUnits: 5
        GlobalSecondaryIndexes:
        - IndexName: ${self:custom.writeModelIndexName}
          KeySchema:
          - AttributeName: entityName
            KeyType: HASH
          - AttributeName: commitId
            KeyType: RANGE
          Projection:
            ProjectionType: INCLUDE
          ProvisionedThroughput:
            ReadCapacityUnits: 5
            WriteCapacityUnits: 5

    ## create an ElasticSearch instance for storing read model projections
    ReadModelProjections:
        Type: 'AWS::Elasticsearch::Domain'
        Properties:
          DomainName: ${self:custom.readModelDomainName}
          ElasticsearchVersion: 6.2
          EBSOptions:
            EBSEnabled: true
            VolumeSize: 10
            VolumeType: gp2
          ElasticsearchClusterConfig:
            InstanceType: t2.small.elasticsearch