AWSTemplateFormatVersion: '2010-09-09'
Resources:
  LambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
          Version: 2012-10-17
          Statement:
            -
              Effect: Allow
              Principal:
                Service:
                  - lambda.amazonaws.com
              Action:
                - sts:AssumeRole
      Path: /
      Policies:
          -
            PolicyName: CloudwatchLogs
            PolicyDocument:
              Version: 2012-10-17
              Statement:
                -
                  Effect: Allow
                  Action:
                    - logs:CreateLogGroup
                  Resource:
                    - !Sub "arn:aws:logs:${AWS::Region}:${AWS::AccountId}:*"
                -
                  Effect: Allow
                  Action:
                    - logs:CreateLogStream
                    - logs:PutLogEvents
                  Resource:
                    - !Sub "arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/*"
  LambdaUDFFunction:
     Type: "AWS::Lambda::Function"
     Properties:
       FunctionName: f-lower-python-varchar
       Role: !GetAtt 'LambdaRole.Arn'
       Timeout: 300
       Code:
         ZipFile: |
           import json
           def handler(event, context):
               print("Received event: " + json.dumps(event, indent=2))
               print(json.dumps(event))
               res = [x[0].lower() for x in event['arguments']]
               ret_json = json.dumps({"results": res})
               return ret_json
       Handler: index.handler
       Runtime: python3.7