Running cloudformation template yaml using boto gives validation error - amazon-web-services

Question

I have created a yaml template file. I want to tag a lambda function based on a condition as given in the documentation https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/conditions-section-structure.html
Following is my yaml-
AWSTemplateFormatVersion: '2012-10-10'
Description: "Cloud formation template"
Parameters:
tagName:
Type: String
Description: "tag name for the resource"
Default: test
Conditions:
isConditionalTag:
- Fn::Equals:
- Ref: tagName
- "test"
Resources:
TestambdaFunction:
Properties:
Code:
S3Bucket: "abc-test"
S3Key: xyz-RELEASE.jar
Description: Test Lambda function
Environment:
Variables:
DATA_TYPE: "test-data"
FunctionName: TestFunction
Handler: com.test.testLambda::handleRequest
MemorySize: 200
Role: "arn:aws:iam::user:role/general"
Runtime: java8
Timeout: 300
Tags:
- Key: "component"
Value:
Fn::If:
- isConditionalTag
- Ref: tagName
- "newValue"
Type: AWS::Lambda::Function
There are no formatting errors while runnning the template using boto gives validation error as
boto.exception.BotoServerError: BotoServerError: 400 Bad Request
{"Error":{"Code":"ValidationError","Message":"Template format error: Conditions can only be boolean operations on parameters and other conditions","Type":"Sender"},"RequestId":"30250a23-4a66-11e8-a3bd-a14cac12563"}

Answer 1

You won't need to use a Condition to get this done.
Conditions are used to define whether or not a resource is created in Cloudformation.
Based on the documentation,
The optional Conditions section includes statements that define when a
resource is created or when a property is defined. For example, you
can compare whether a value is equal to another value. Based on the
result of that condition, you can conditionally create resources
You should be able to solve this doing something like this (untested):
Parameters:
tagName:
Type: String
Description: "tag name for the resource"
Default: test
Resources:
TestambdaFunction:
Properties:
Code:
S3Bucket: "abc-test"
S3Key: xyz-RELEASE.jar
Description: Test Lambda function
Environment:
Variables:
DATA_TYPE: "test-data"
FunctionName: TestFunction
Handler: com.test.testLambda::handleRequest
MemorySize: 256
Role: "arn:aws:iam::user:role/general"
Runtime: java8
Timeout: 300
Tags:
- Key: "component"
Value: !Ref tagName
Type: AWS::Lambda::Function
Note that Lambda functions need memory in increments of 64MB