Self healing systemd services if it is in failed status.

systemd.py

#!/usr/bin/env python3

from subprocess import (
    Popen,
    PIPE
)

class Service(object):

    def __init__(self, service_name):
        self.service = f"{service_name}.service"

    def __run__(self, action):
        with Popen(["systemctl", action, self.service], stdout=PIPE, stderr=PIPE) as process:
            return {'status': process.stdout.read(), 'error': process.stderr.read()}

    def reload(self):
        self.__run__('reload')

    def restart(self):
        self.__run__('restart')

    def start(self):
        self.__run__('start')

    @property
    def status(self):
        with Popen(["systemctl", "show", "-p", "SubState", "-p", "ActiveState", self.service"], stdout=PIPE, stderr=PIPE) as process:
            res = [item.decode('utf-8').split('=') for item in process.stdout.readlines()]
        return {i[0]: i[1].strip() for i in res}

    def stop(self):
        self.__run__('start')

    def heal(self):
        if self.status.get('ActiveState') == 'failed':
            if self.status.get('SubState') == 'failed':
                self.reload()
                self.restart()
            else:
                self.reload()
        return self.status


## Usage
#
# sshd = Service('sshd')
# #check status
# if sshd.status.get('SubStatus') == 'failed':
#    sshd.heal()

## Alternative implementation: Add an initializer tho convert it from a simple lib to act as a script also,
#
# if __name__ == __main__:
# from sys import argv
# if len(argv) > 1:
#     svc = Service(argv)
#     if sshd.status.get('SubStatus') == 'failed':
#        sshd.heal()