Option (or default) to wrap up executions before shutting down Sandbox

[ryanblock]

Currently, when Sandbox is ordered to shut down, it does so immediately. This is a pretty nice user experience, as it keeps things moving super fast, especially in tests.

However, sometimes a Lambda may still be executing. Sandbox will shut down, and the spawned process, now without a parent, may start outputting red herring errors to the console.

I'm thinking an option (or change of defaults) to wrap up executions before shutting down might be helpful. Some ideas:

Module

// Immediately terminates
await sandbox.end()

// Wait for all Lambdas to terminate; this could in theory delay shutdown by up to 15 minutes
await sandbox.end({ clean: true })

// Same as above, but force termination after 5 seconds?
await sandbox.end({ clean: true, forceShutdown: 5000 })

CLI

# ctrl-c → Immediately terminates

# ctrl-c
$ There appear to be 3 Lambda processes still running, would you like to wait for them to finish?
> Wait for processes to finish
  Terminate immediately