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How to use attach_to_existing_process method in autotest

Best Python code snippet using autotest_python

pidfile_monitor.py

Source:pidfile_monitor.py

...21    return pidfile_timeout_mins * 6022class PidfileRunMonitor(object):23    """24    Client must call either run() to start a new process or25    attach_to_existing_process().26    """27    class _PidfileException(Exception):28        """29        Raised when there's some unexpected behavior with the pid file, but only30        used internally (never allowed to escape this class).31        """32    def __init__(self):33        self._drone_manager = drone_manager.instance()34        self.lost_process = False35        self._start_time = None36        self.pidfile_id = None37        self._killed = False38        self._state = drone_manager.PidfileContents()39    def _add_nice_command(self, command, nice_level):40        if not nice_level:41            return command42        return ['nice', '-n', str(nice_level)] + command43    def _set_start_time(self):44        self._start_time = time.time()45    def run(self, command, working_directory, num_processes, nice_level=None,46            log_file=None, pidfile_name=None, paired_with_pidfile=None,47            username=None, drone_hostnames_allowed=None):48        assert command is not None49        if nice_level is not None:50            command = ['nice', '-n', str(nice_level)] + command51        self._set_start_time()52        self.pidfile_id = self._drone_manager.execute_command(53            command, working_directory, pidfile_name=pidfile_name,54            num_processes=num_processes, log_file=log_file,55            paired_with_pidfile=paired_with_pidfile, username=username,56            drone_hostnames_allowed=drone_hostnames_allowed)57    def attach_to_existing_process(self, execution_path,58                                   pidfile_name=drone_manager.AUTOSERV_PID_FILE,59                                   num_processes=None):60        self._set_start_time()61        self.pidfile_id = self._drone_manager.get_pidfile_id_from(62            execution_path, pidfile_name=pidfile_name)63        if num_processes is not None:64            self._drone_manager.declare_process_count(self.pidfile_id, num_processes)65    def kill(self):66        if self.has_process():67            self._drone_manager.kill_process(self.get_process())68            self._killed = True69    def has_process(self):70        self._get_pidfile_info()71        return self._state.process is not None72    def get_process(self):73        self._get_pidfile_info()74        assert self._state.process is not None75        return self._state.process76    def _read_pidfile(self, use_second_read=False):77        assert self.pidfile_id is not None, (78            'You must call run() or attach_to_existing_process()')79        contents = self._drone_manager.get_pidfile_contents(80            self.pidfile_id, use_second_read=use_second_read)81        if contents.is_invalid():82            self._state = drone_manager.PidfileContents()83            raise self._PidfileException(contents)84        self._state = contents85    def _handle_pidfile_error(self, error, message=''):86        self.on_lost_process(self._state.process)87    def _get_pidfile_info_helper(self):88        if self.lost_process:89            return90        self._read_pidfile()91        if self._state.process is None:92            self._handle_no_process()...

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