Unable to cancel dl-serve with ctrl + C

[renereimann]

When running sensor-logger not in detached mode, I can not break the execution of dl-serve using CTRL+C.
When pressing CTRL + C an LOG ERROR is reported:

{'timestamp': '2025-11-13T18:12:56.830981Z', 'endpoint_name': 'pg70_pressure_mbar', 'value_cal': 640.0, 'value_raw': 640.0}
^C[*** LOG ERROR #0175 ***] [2025-11-13 18:12:57] [signal_handler] async log: thread pool doesn't exist anymore [/usr/local/src/scarab/library/utility/signal_handler.cc(370)]

I am running dl-python version 5.1.1 in docker compose. For the test above I started the container with the main process doing sleep 10000 while I connect to the docker container and run dl-serve using PDB
/usr/local/bin/python -m pdb /usr/local/bin/dl-serve -c /root/auth/sensor-logger.yaml -vvv

[renereimann]

I see the same error message also in just normal running sensor-logger

2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(42) -> in python's on alert
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(49) -> routing key: 'sensor_value.pg60_pressure_mbar'
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(50) -> regex: 'sensor_value\.(?P<endpoint_name>\w+)'
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(44) -> routing key data are:
{'endpoint_name': 'pg60_pressure_mbar'}
2025-11-14T08:24:03[INFO    ] dripline.implementations.postgres_sensor_logger(52) -> Inserting from endpoint values_table; data are:
{'timestamp': '2025-11-14T08:24:03.327610Z', 'endpoint_name': 'pg60_pressure_mbar', 'value_cal': 590.0, 'value_raw': 590.0}
2025-11-14T08:24:03[DEBUG   ] dripline.implementations.postgres_sensor_logger(55) -> Return from insertion: {}
2025-11-14T08:24:03[INFO    ] dripline.implementations.postgres_sensor_logger(56) -> finished processing data
[*** LOG ERROR #0204 ***] [2025-11-14 08:24:03] [amqp] async log: thread pool doesn't exist anymore [/usr/local/src/library/core.cc(299)]
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(42) -> in python's on alert
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(49) -> routing key: 'sensor_value.pg100_pressure_mbar'
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(50) -> regex: 'sensor_value\.(?P<endpoint_name>\w+)'
2025-11-14T08:24:03[DEBUG   ] dripline.core.alert_consumer(44) -> routing key data are:
{'endpoint_name': 'pg100_pressure_mbar'}```

[renereimann]

These are acutally two seperate issues, a logging issue and a ctrl-c issue. I can also not interupt dl-serve with ctrl-c in normal running mode.

[nsoblath]

I'm going to focus this issue on the ctrl-c issue. The log error is annoying but doesn't hinder operations as the logger backend appears to recover. I'll change the title accordingly.

[nsoblath]

This does not appear to be a dl-cpp issue. run_simple_service can be cancelled with sigint.

[nsoblath]

This may actually be related to the logger errors, but I'm not completely sure. It might be that the logger errors interrupt whatever was being done when then occur, and while the application might recover, perhaps the function in which the logging was performed doesn't continue. This would explain why the ctrl-c isn't working to quit the application -- in this specific case and under this hypothesis, the act of quitting isn't being completed because of the error.