baseimage-tutorial-framework/lib/tfw/mixins/supervisor_mixin.py

import xmlrpc.client
from xmlrpc.client import Fault as SupervisorFault
from contextlib import suppress
from os import remove

from tfw.decorators.lazy_property import lazy_property
from tfw.config import TFWENV


class SupervisorBaseMixin:
    @lazy_property
    def supervisor(self):
        # pylint: disable=no-self-use
        return xmlrpc.client.ServerProxy(TFWENV.SUPERVISOR_HTTP_URI).supervisor


class SupervisorMixin(SupervisorBaseMixin):
    def stop_process(self, process_name):
        with suppress(SupervisorFault):
            self.supervisor.stopProcess(process_name)

    def start_process(self, process_name):
        self.supervisor.startProcess(process_name)

    def restart_process(self, process_name):
        self.stop_process(process_name)
        self.start_process(process_name)


class SupervisorLogMixin(SupervisorBaseMixin):
    def read_stdout(self, process_name, tail=0):
        return self.supervisor.readProcessStdoutLog(process_name, -tail, 0)

    def read_stderr(self, process_name, tail=0):
        return self.supervisor.readProcessStderrLog(process_name, -tail, 0)

    def clear_logs(self, process_name):
        for logfile in ('stdout_logfile', 'stderr_logfile'):
            with suppress(FileNotFoundError):
                remove(self.supervisor.getProcessInfo(process_name)[logfile])
        self.supervisor.clearProcessLogs(process_name)