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

# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
# All Rights Reserved. See LICENSE file for details.

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

from tfw.config import TFWENV


class SupervisorMixin:
    supervisor = xmlrpc.client.ServerProxy(TFWENV.SUPERVISOR_HTTP_URI).supervisor

    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 read_log_stdout(self, process_name):
        return self._read_log_internal(self.supervisor.readProcessStdoutLog, process_name)

    def read_log_stderr(self, process_name):
        return self._read_log_internal(self.supervisor.readProcessStderrLog, process_name)

    def _read_log_internal(self, read_method, process_name):
        log = read_method(process_name, 0, 0)
        self.clear_logs(process_name)
        return log

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

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