Debug calls in a script - not visible in the logs

Questions
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1

I have the following code:

stuff : Script ()
stuff = do
    debug "START"
    # do things
    ...
    debug "END"

It prints the debug texts in the “Trace” section in Daml Studio but how is it that I do not see them in the sandbox.log (–log-level DEBUG)?

2

Daml Script does not execute on the Sandbox which represents the ledger, but “client side”, ie in a separate process. You can test this by starting a sandbox using daml sandbox and then running

> daml script --dar .daml/dist/script-debug-0.0.1.dar --script-name="Main:stuff" --ledger-host=localhost --ledger-port=6865
[DA.Internal.Prelude:555]: "START"
[DA.Internal.Prelude:555]: "END"`

If you use daml start, you can also see it after the line “Running the initialization script.”:

❯ daml start

2022-01-26 12:32:07.59 [INFO]  [build]
Compiling script-debug to a DAR.

2022-01-26 12:32:08.12 [INFO]  [build]
Created .daml/dist/script-debug-0.0.1.dar
Waiting for sandbox to start:
13:32:09.155 [sandbox-akka.actor.default-dispatcher-4] INFO  akka.event.slf4j.Slf4jLogger - Slf4jLogger started
13:32:13.752 [program-resource-pool-1] INFO  c.d.p.apiserver.LedgerApiServer - Listening on localhost:6865 over plain text.
   ____             ____
  / __/__ ____  ___/ / /  ___ __ __
 _\ \/ _ `/ _ \/ _  / _ \/ _ \\ \ /
/___/\_,_/_//_/\_,_/_.__/\___/_\_\

13:32:13.786 [program-resource-pool-3] INFO  com.daml.platform.sandboxnext.Runner - Initialized sandbox version 2.0.0-snapshot.20211123.8463.0.bd2a6852 with ledger-id = 6a835f73-bf41-4986-a092-069143977b1e, port = 6865, dar file = List(.daml/dist/script-debug-0.0.1.dar), time mode = wall-clock time, ledger = in-memory, auth-service = AuthServiceWildcard$, contract ids seeding = strong
Running the initialization script.
[DA.Internal.Prelude:555]: "START"
[DA.Internal.Prelude:555]: "END"
Waiting for navigator to start:
   _  __          _           __
  / |/ /__ __  __(_)__ ____ _/ /____  ____
 /    / _ `/ |/ / / _ `/ _ `/ __/ _ \/ __/
/_/|_/\_,_/|___/_/\_, /\_,_/\__/\___/_/
                 /___/
Version 2.0.0-snapshot.20211123.8463.0.bd2a6852
Frontend running at http://localhost:7500.

Edit: Note that none of this requires special log level settings.

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