LambdaBackedCustomResourceWithPythonRuntime.template

{
  "Description" : "This is a sample template for lambda-backed custom resource. Runtime for Lambda function is python",
  "Parameters" : {
    "Base" : {
      "Type" : "String",
      "Default" : "10"
    },
    "CustomResourceId" : {
      "Type" : "String",
      "Default" : "SomeCustomResourceId"
    }
  },
  "Resources":{
    "TestCustomResource" : {
      "Type" : "Custom::TestCustomResourceWithLambda",
      "Properties" : {
        "ServiceToken" : { "Fn::GetAtt" : ["TestLambdaFunction", "Arn"] },
        "Base" : { "Ref" : "Base" },
        "Id" : { "Ref" : "CustomResourceId" }
      }
    },
    "TestLambdaFunction" : {
      "Type" : "AWS::Lambda::Function",
      "Properties" : {
        "Handler" : "index.handler",
        "Role" : {"Fn::GetAtt" : ["TestLambdaExecutionRole", "Arn"]},
        "Code" : {
            "ZipFile" : { "Fn::Join" : ["\n", [
              "from __future__ import print_function",
              "import json",
              "import cfnresponse",
              "print('Loading function')",
              "def handler(event, context):",
              "   base = event['ResourceProperties']['Base']",
              "   customId = event['ResourceProperties']['Id']",
              "   outputData = {}",
              "   isInt = True",
              "   try:",
              "      int(base)",
              "   except ValueError:",
              "      isInt = False",
              "   except Exception as e:",
              "      print(e)",
              "      cfnresponse.send(event, context, cfnresponse.FAILED, { 'error': str(e) }, customId)",
              "      return",
              "   if event['RequestType'] != 'Delete' and isInt:",
              "      outputData['Result'] = int(base) * 5",
              "   if event['RequestType'] == 'Delete' or isInt:",
              "      cfnresponse.send(event, context, cfnresponse.SUCCESS, outputData, customId)",
              "   else:",
              "      cfnresponse.send(event, context, cfnresponse.FAILED, outputData, customId)"
            ]]}
        },
        "Timeout" : "10",
        "MemorySize" : "256",
        "Runtime" : "python2.7"
      }
    },
    "TestLambdaExecutionRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "lambda.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Path": "/",
        "Policies": [
          {
            "PolicyName": "cwlogs",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": "logs:CreateLogGroup",
                  "Resource": { "Fn::Join" : [":", ["arn:aws:logs", { "Ref" : "AWS::Region" }, { "Ref" : "AWS::AccountId" }, "*" ]] }
                },
                {
                  "Effect": "Allow",
                  "Action": [
                    "logs:CreateLogStream",
                    "logs:PutLogEvents"
                  ],
                  "Resource": [
                    { "Fn::Join" : [":", ["arn:aws:logs", { "Ref" : "AWS::Region" }, { "Ref" : "AWS::AccountId" }, "log-group", "/aws/lambda/*", "*" ]] }
                  ]
                }
              ]
            }
          }
        ]
      }
    }
  },
  "Outputs" : {
    "Result" : {
      "Value" : { "Fn::GetAtt" : [ "TestCustomResource", "Result" ] }
    }
  }
}