AWS SAM CLI beta CDK build cannot invoke Lambda functions generated by AWS Solutions Constructs

[alexpulver]

AWS SAM CLI beta CDK build cannot invoke Lambda function generated by aws_solutions_constructs.aws_apigateway_lambda.ApiGatewayToLambda construct.

Reproduction Steps

1. Install AWS SAM CLI beta CDK build following the instructions in Getting started with AWS SAM and the AWS CDK

2. Run the following commands:

git clone https://github.com/alexpulver/aws-cdk-project-structure-python-basic
cd aws-cdk-project-structure-python-basic

# *** Remove "@aws-cdk/core:newStyleStackSynthesis": "true" from cdk.context.json ***

python3 -m venv .venv
source .venv/bin/activate
./install-deps.sh
export AWS_ACCESS_KEY_ID="****"
export AWS_SECRET_ACCESS_KEY="****"
export AWS_SESSION_TOKEN="****"
npx cdk synth
grep -B1 ::Function cdk.out/AwsCdkProjectDev.template.json 
# Example output:
#    "ApiApiGatewayToLambdaLambdaFunction036A2BFE": {
#      "Type": "AWS::Lambda::Function",
sam-beta-cdk local invoke AwsCdkProjectDev/ApiApiGatewayToLambdaLambdaFunction036A2BFE

Error Log

The resource AWS::Lambda::Function 'ApiApiGatewayToLambdaLambdaFunction036A2BFE' has specified S3 location for Code. It will not be built and SAM CLI does not support invoking it locally.
The resource AWS::Lambda::Function 'ApiApiGatewayToLambdaLambdaFunction036A2BFE' has specified S3 location for Code. It will not be built and SAM CLI does not support invoking it locally.
AwsCdkProjectDev/ApiApiGatewayToLambdaLambdaFunction036A2BFE not found. Possible options in your template: []
Error: Function AwsCdkProjectDev/ApiApiGatewayToLambdaLambdaFunction036A2BFE not found in template

Environment

• CDK CLI Version : 1.106.1
• CDK Framework Version: 1.106.1
• AWS Solutions Constructs Version : 1.106.1
• OS : macOS Catalina 10.15.7
• Language : English

Other

The ApiGatewayToLambda construct overwrites the Metadata field (source code) to add the cfn_nag object. The original CDK Lambda construct populates fields like aws:asset:path and aws:asset:property into the resource Metadata. sam-beta-cdk relies on these info to locate the local Lambda code. I think the ApiGatewayToLambda construct should try to avoid overwriting the whole Metadata object. Instead, it should only update the existing Metadata object. Thanks @hawflau for the analysis!

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This is 🐛 Bug Report

[alexpulver]

@biffgaut thanks a lot! Saw that this was finally released in AWS Solutions Constructs 1.114.0 today, tested with the latest AWS SAM CLI beta and it works.

$ sam-beta-cdk local invoke UUID4GeneratorBackend-Dev/LambdaFunction | jq
Synthesizing CDK App
Invoking app.handler (python3.7)
Skip pulling image and use local one: amazon/aws-sam-cli-emulation-image-python3.7:rapid-1.22.0.dev202107140310.

Mounting /Users/apulver/aws-cdk-project-structure-python-basic/.aws-sam/.cdk-out/asset.95125f45dbdf585e631e3e345d6e11e03ba441f7d55587aaf2a22c66392ce5c7 as /var/task:ro,delegated inside runtime container
START RequestId: 12c2925f-9e79-4713-9046-9db3be3c5195 Version: $LATEST
request: {}
END RequestId: 12c2925f-9e79-4713-9046-9db3be3c5195
REPORT RequestId: 12c2925f-9e79-4713-9046-9db3be3c5195	Init Duration: 0.24 ms	Duration: 960.08 ms	Billed Duration: 1000 ms	Memory Size: 128 MB	Max Memory Used: 128 MB	
{
  "statusCode": 200,
  "headers": {
    "Content-Type": "text/plain"
  },
  "body": "Hello, CDK! Here is your UUID4: {'uuid': '32c5e81c-c9b7-48ef-91fb-ac8a9fddafab'}\n"
}