Description of sensorAlarm

SensorAlarm pools the database filled by readsensor and checks for alarm conditions. Alarms are given based on criteria. The table with all criteria and actions is given below.

The code for sensorAlarm can be found in CVS, in the module wsrt_mac/alarms. The following files are used by the sensorAlarm program:

• alarmActions.py → class to execute shell-commands and send mail to the observer on duty.
• class_sensorAlarm.py → class that does most of the things
• DBConnection.py → class for interfacing with a MySQL database
• log.py → class to write to a logfile
• sensorAlarm.py → Main program

The alarmActions class handles the execution of shell-commands. It provides a mechanism to stop a command after it has been running for a certain amount of time (timeout). The default timeout is one second.

In case of problems with executing a command (timeout, or a non-zero exit status) the observer will be notified by email/SMS. This uses the sendMail program.

Logmessages are written to a logfile (see class log.py).

This is the Alarm conditions table that is used in the software. It originates from the file /wsrt/config/alarmconditions.cfg on wop33.