health checks for waterfurnace_aurora

[ltomes]

I have observed cases where waterfurnace_aurora has stopped publishing new events to my MQTT broker, but I don't see any errors in the waterfurnace_aurora docker containers logs to indicate anything is wrong. Restarting the docker container resolves this.

Ideally I think I would create a healthcheck in docker compose that restarts my service if it is not sending events as expected.

I attempted to add the following healthcheck:

    healthcheck:
      test:
        [
          "CMD-SHELL",
          "aurora_fetch --yaml ${MODBUS_DEVICE_PATH} valid"
        ]
      interval: 10s
      timeout: 10s
      retries: 24

but see this in the logs after:

got garbage: Illegal function: 0; ["/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/lib/aurora/modbus/slave.rb:53:in `read_rtu_response'", "/usr/local/bundle/gems/rmodbus-2.1.3/lib/rmodbus/rtu_slave.rb:35:in `read_pdu'", "/usr/local/bundle/gems/rmodbus-2.1.3/lib/rmodbus/client/slave.rb:269:in `block in query'", "/usr/local/lib/ruby/3.3.0/timeout.rb:186:in `block in timeout'", "/usr/local/lib/ruby/3.3.0/timeout.rb:193:in `timeout'", "/usr/local/bundle/gems/rmodbus-2.1.3/lib/rmodbus/client/slave.rb:267:in `query'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/lib/aurora/modbus/slave.rb:12:in `read_multiple_holding_registers'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/lib/aurora/abc_client.rb:223:in `refresh'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/exe/aurora_mqtt_bridge:102:in `block (3 levels) in join'", "/usr/local/bundle/gems/mqtt-ccutrer-1.0.3/lib/mqtt/client.rb:342:in `batch_publish'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/exe/aurora_mqtt_bridge:101:in `block (2 levels) in join'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/exe/aurora_mqtt_bridge:100:in `synchronize'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/exe/aurora_mqtt_bridge:100:in `block in join'", "<internal:kernel>:187:in `loop'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/exe/aurora_mqtt_bridge:98:in `join'", "/usr/local/bundle/gems/waterfurnace_aurora-1.5.2/exe/aurora_mqtt_bridge:877:in `<top (required)>'", "aurora_mqtt_bridge:25:in `load'", "aurora_mqtt_bridge:25:in `<main>'"]

Does anyone have any suggestions for what a simple health check could look like for this service?
I'm happy to MR it back to https://github.com/ccutrer/waterfurnace_aurora/blob/main/docker/README.md once I've observed it restarting the service after a failure.