How to process SIGTERM signal gracefully?

Question

Let\'s assume we have such a trivial daemon written in python:

def mainloop():
    while True:
        # 1. do
        # 2. some
        # 3. important
              


        

Answer 1

The simplest solution I have found, taking inspiration by responses above is

class SignalHandler:

    def __init__(self):

        # register signal handlers
        signal.signal(signal.SIGINT, self.exit_gracefully)
        signal.signal(signal.SIGTERM, self.exit_gracefully)

        self.logger = Logger(level=ERROR)

    def exit_gracefully(self, signum, frame):
        self.logger.info('captured signal %d' % signum)
        traceback.print_stack(frame)

        ###### do your resources clean up here! ####

        raise(SystemExit)