Json-api debug messages

Hi daml Community!

I run sandbox with:

daml sandbox --port-file ./scripts/components/canton-sandbox-port.txt --log-level-root=DEBUG --log-level-canton=DEBUG --log-level-stdout=DEBUG

and then json-api with:

daml json-api --ledger-host localhost --ledger-port 6865 --http-port 7575 --log-level DEBUG --max-inbound-message-size 9283730

Then I exercise a choice via json-api. Inside daml choice code I have

debug "my message"

Is there a way to print debug messages to the log? With this set up I cannot find my debug messages… Am I missing something? Is it possible? I want to debug a choice exercising it from json-api. I see debug messages with VS Code sandbox running a script but not with json-api request… I tried trace messages and cannot find them in the log too.

Hi @VictorShneer,

I used the same arguments as you did and my debug message showed up for me upon exercising the choice. You should check your sandbox logs (log/canton.log at the path you started the sandbox at by default).
Search for “DEBUG daml.tracelog”, the result should be only lines outputted by your code.

Kind Regards,
Mate

VictorShneer:

–log-level DEBUG

For what it’s worth, this option doesn’t help here. As @Mate_Varga noted, the log appears in the sandbox log; it will never appear in json-api’s own logs, because json-api is not executing the daml containing the debug call, and never sees this message.