baseimage-tutorial-framework/lib/tfw/components/supervisor.py

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


class SupervisorBase:
    def __init__(self, supervisor_uri):
        self.supervisor = xmlrpc.client.ServerProxy(supervisor_uri).supervisor


class ProcessManager(SupervisorBase):
    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 LogManager(SupervisorBase):
    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)