When an error is returned by the lambda wrapped by aws cfn wrapper; the PhysicalResourceID is not included. It was modified recently to include all request types: #76
However, AWS Docs mention PhysicalResourceID is always required. Therefore Cloudformation incorrectly reports the error "Invalid Physical Resource ID" instead of the actual error during resource creation.
Steps to replicate:
Modified the Simple Test Lambda to include an error condition:
package main
import (
"context"
"fmt"
"errors"
"github.com/aws/aws-lambda-go/cfn"
"github.com/aws/aws-lambda-go/lambda"
)
func echoResource(ctx context.Context, event cfn.Event) (physicalResourceID string, data map[string]interface{}, err error) {
v, _ := event.ResourceProperties["Echo"].(string)
if event.RequestType == "Create" {
if v == "ERROR" {
err = errors.New("My Custom Resource Creation Failed")
fmt.Errorf("Error occurred")
return
}
}
data = map[string]interface{} {
"Echo": v,
}
return
}
func main() {
lambda.Start(cfn.LambdaWrap(echoResource))
}
Created simple Cloudformation template to create custom resource:
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: AWS Test
Resources:
TestResource:
Type: "Custom::TestResource"
Properties:
Echo: ERROR
ServiceToken: arn:aws:lambda:us-west-1:xxxxx:function:cfn-test
Observed that the error reported during Stack Creation is incorrect:
The error message reported must be : My Custom Resource Creation Failed
When an error is returned by the lambda wrapped by aws cfn wrapper; the PhysicalResourceID is not included. It was modified recently to include all request types: #76
However, AWS Docs mention PhysicalResourceID is always required. Therefore Cloudformation incorrectly reports the error "Invalid Physical Resource ID" instead of the actual error during resource creation.
Steps to replicate:
Modified the Simple Test Lambda to include an error condition:
Created simple Cloudformation template to create custom resource:
Observed that the error reported during Stack Creation is incorrect:
The error message reported must be :
My Custom Resource Creation Failed