start-api: Intrinsics like AWS::StackName appear undefined

[studds]

Description:

In v0.2.11 when running with sam local start-api, !Ref AWS::StackName returned 'goformation-stack' - I believe defined in https://github.com/awslabs/aws-sam-cli/blob/release/v0.2.11/vendor/github.com/awslabs/goformation/intrinsics/ref.go. In v0.3.0, it seems like nothing is returned.

Are these intrinsics still present in v0.3.0?

Steps to reproduce the issue:

1. Create a template that references AWS::StackName (see template.yaml below)
2. Create a app.js (see below) which logs process.env.STACK_NAME
3. Run sam local start-api
4. Navigate to http://localhost:3000/hello

template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
    sam-app

    Sample SAM Template for sam-app
    
# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
    Function:
        Timeout: 3


Resources:

    HelloWorldFunction:
        Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
        Properties:
            Handler: app.lambda_handler
            Runtime: nodejs8.10
            Environment: # More info about Env Vars: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#environment-object
                Variables:
                    STACK_NAME: !Ref AWS::StackName
            Events:
                HelloWorld:
                    Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
                    Properties:
                        Path: /hello
                        Method: get

app.js

exports.lambda_handler = async (event, context, callback) => {
	console.log('stack name: ' + process.env.STACK_NAME);
    callback(null, {
        'statusCode': 200,
        'body': 'OK'
    });
};

Observed result:

v0.2.11: log contains stack name: goformation-stack
v0.3.0: log contains stack name:

Expected result:

Both versions should output a stack name.

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

Output of sam --version:

SAM CLI, version 0.3.0

Optional Debug logs:

Add --debug flag to command you are running

[sanathkr]

Yes, this is a breaking change between the two versions. After v0.3.0 we stopped faking default AWS parameter values. Instead you can directly override the environment variable by passing value to sam local start-api --env-vars command.

Would this work for you?

[studds]

Yes, this will work in my case.

[jfuss]

We started resolving AWS::StackName in v0.6.1. Locally the StackName is defined as 'local'.

Closing