Ruby handler param bugs

Describe the issue There are several weird bugs happening in sandbox for Ruby lambdas:

1. When setting the handler method arguments as

def handler(event, context)
  .....
end

You get the following error: handler': wrong number of arguments (given 0, expected 2) (ArgumentError)

1. To fix the above error, you can provide a default empty hash to the arguments:

def handler(event={}, context={})
  .....
end

However, this causes different issues when introducing an error into the code. If I were to then intentionally cause a bug, the function is now executed twice in a row, and the value of the arguments are empty the second time around.

def handler(event = {}, context = {})
 puts event
 puts context
 puts foo # raise an undefined local variable error
 { body: 'hello world' }
end

Result:

/Users/jeremycohenhoffing/projects/lambda-test-app/src/http/get-index/index.rb:9:in `handler': undefined local variable or method `foo' for main:Object (NameError)
   from -e:16:in `rescue in <main>'
   from -e:12:in `<main>'
{:event=>{"version"=>"2.0", "routeKey"=>"GET /", "rawPath"=>"/", "rawQueryString"=>"", "cookies"=>["some_cookies"], "headers"=>{"host"=>"localhost:3333", "cache-control"=>"max-age=0", "sec-ch-ua"=>"\", "accept"=>"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9", "accept-language"=>"en-US,en;q=0.9", "sec-gpc"=>"1"}, "requestContext"=>{"http"=>{"method"=>"GET", "path"=>"/"}, "routeKey"=>"GET /"}, "isBase64Encoded"=>false}, :context=>{"aws_request_id"=>"xxxxxx", "function_name"=>"sandbox-get-index", "function_version"=>"$LATEST", "invoked_function_arn"=>"sandbox", "memory_limit_in_mb"=>1152}}
{} 
{} # second time the function is executed with arguments now empty
{}

Please also see this discussion: https://discord.com/channels/880272256100601927/884128391341678742/953697307528929280

Steps to reproduce Steps to reproduce the behavior:

1. I created a boilerplate Architect v10.1.0 project here: https://github.com/jcohenho/ruby-lambda-test-arc-app
2. Run the app with npx arc sandbox
3. For the first issue, change the handler arguments to

def handler(event, context)

1. For the second issue, intentionally add a bug and see that the handler is executed twice

Expected behavior

1. I expect the lambda handler to run only once
2. I expect the lambda to not have weird params issues and show correct errors

Screenshots If applicable, add screenshots to help explain your problem

Desktop Please complete the following information (if appropriate):

• OS: MacOS Catalina 10.15.6
• Browser: Chrome
• Version: 98.0.4758.109

[brianleroux]

lots of stuff on the go but I’ll do my best to have a look today 🙏

[jcohenho]

@brianleroux @ryanblock I would love to help contribute to this but I need a little help and guidance for how to run and test this sandbox code locally. I’m not sure where to begin so any advice would be much appreciated 🙏