glances.plugins.processlist

Complexity

Total Complexity

184

Size/Duplication

Total Lines	959
Duplicated Lines	10.95 %

Importance

Changes

0

44 Methods

Rating	Name	Duplication	Size	Complexity
B	ProcesslistPlugin._get_process_curses_cmdline()	0	31	8
A	ProcesslistPlugin._get_process_curses_vms()	0	9	3
B	ProcesslistPlugin._get_process_curses_io_read_write()	0	18	7
B	ProcesslistPlugin.load()	0	20	7
A	ProcesslistPlugin.add_memory_line()	0	13	4
A	ProcesslistPlugin.add_ionice_line()	0	5	1
A	ProcesslistPlugin._msg_curse_extended_process_thread()	0	19	2
C	ProcesslistPlugin.get_status_alert()	0	13	10
C	ProcesslistPlugin.get_nice_alert()	0	13	9
A	ProcesslistPlugin._get_process_curses_memory_percent()	0	15	2
A	ProcesslistPlugin.get_export()	0	6	1
A	ProcesslistPlugin._get_process_curses_pid()	0	5	1
A	ProcesslistPlugin._sort_stats()	0	3	1
A	ProcesslistPlugin.maybe_add_cpu_affinity_line()	0	7	3
A	ProcesslistPlugin._get_process_curses_io_counters()	0	4	1
A	ProcesslistPlugin._get_process_curses_memory_info()	0	6	2
A	ProcesslistPlugin.maybe_add_memory_swap_line()	0	10	3
A	ProcesslistPlugin._mmm_key()	0	5	2
A	ProcesslistPlugin.add_title_line()	0	6	1
B	ProcesslistPlugin.maybe_add_ionice_line()	0	18	6
A	ProcesslistPlugin.get_headers()	0	8	2
A	ProcesslistPlugin.add_io_and_network_lines()	0	8	4
A	ProcesslistPlugin.add_memory_info_lines()	0	12	2
A	ProcesslistPlugin.update()	0	19	2
A	ProcesslistPlugin.get_process_curses_data()	0	27	4
A	ProcesslistPlugin._get_process_curses_status()	0	14	2
A	ProcesslistPlugin._get_process_curses_nice()	0	12	3
C	ProcesslistPlugin._msg_curse_sum()	94	94	10
A	ProcesslistPlugin.get_key()	0	3	1
A	ProcesslistPlugin.is_selected_process()	0	6	1
A	ProcesslistPlugin._mmm_reset()	0	4	1
F	ProcesslistPlugin._msg_curse_header()	11	64	26
A	ProcesslistPlugin._mmm_deco()	0	5	2
A	ProcesslistPlugin._msg_curse_extended_process()	0	28	1
A	ProcesslistPlugin._get_process_curses_num_threads()	0	10	3
A	ProcesslistPlugin.add_cpu_line()	0	9	1
F	ProcesslistPlugin._sum_stats()	0	44	14
A	ProcesslistPlugin.__init__()	0	29	4
B	ProcesslistPlugin.msg_curse()	0	43	7
A	ProcesslistPlugin._get_process_curses_rss()	0	9	3
A	ProcesslistPlugin._get_process_curses_username()	0	9	2
A	ProcesslistPlugin._get_process_curses_cpu_percent()	0	19	5
A	ProcesslistPlugin._get_process_curses_cpu_times()	0	30	5
A	ProcesslistPlugin._max_pid_size()	0	7	2

#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2024 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#

"""Process list plugin."""

import copy
import functools
import os

from glances.globals import WINDOWS, key_exist_value_not_none_not_v, replace_special_chars
from glances.logger import logger
from glances.outputs.glances_unicode import unicode_message
from glances.plugins.core import CorePlugin
from glances.plugins.plugin.model import GlancesPluginModel
from glances.processes import glances_processes, sort_stats

# Fields description
# description: human readable description
# short_name: shortname to use un UI
# unit: unit type
# rate: if True then compute and add *_gauge and *_rate_per_is fields
# min_symbol: Auto unit should be used if value > than 1 'X' (K, M, G)...
fields_description = {
    'pid': {
        'description': 'Process identifier (ID)',
        'unit': 'number',
    },
    'name': {
        'description': 'Process name',
        'unit': 'string',
    },
    'cmdline': {
        'description': 'Command line with arguments',
        'unit': 'list',
    },
    'username': {
        'description': 'Process owner',
        'unit': 'string',
    },
    'num_threads': {
        'description': 'Number of threads',
        'unit': 'number',
    },
    'cpu_percent': {
        'description': 'Process CPU consumption \
(returned value can be > 100.0 in case of a process running multiple threads on different CPU cores)',
        'unit': 'percent',
    },
    'memory_percent': {
        'description': 'Process memory consumption',
        'unit': 'percent',
    },
    'memory_info': {
        'description': 'Process memory information (dict with rss, vms, shared, text, lib, data, dirty keys)',
        'unit': 'byte',
    },
    'status': {
        'description': 'Process status',
        'unit': 'string',
    },
    'nice': {
        'description': 'Process nice value',
        'unit': 'number',
    },
    'cpu_times': {
        'description': 'Process CPU times (dict with user, system, iowait keys)',
        'unit': 'second',
    },
    'gids': {
        'description': 'Process group IDs (dict with real, effective, saved keys)',
        'unit': 'number',
    },
    'io_counters': {
        'description': 'Process IO counters (list with read_count, write_count, read_bytes, write_bytes, io_tag keys)',
        'unit': 'byte',
    },
}


def seconds_to_hms(input_seconds):
    """Convert seconds to human-readable time."""
    minutes, seconds = divmod(input_seconds, 60)
    hours, minutes = divmod(minutes, 60)

    hours = int(hours)
    minutes = int(minutes)
    seconds = str(int(seconds)).zfill(2)

    return hours, minutes, seconds


def split_cmdline(bare_process_name, cmdline):
    """Return path, cmd and arguments for a process cmdline based on bare_process_name.

    If first argument of cmdline starts with the bare_process_name then
    cmdline will just be considered cmd and path will be empty (see https://github.com/nicolargo/glances/issues/1795)

    :param bare_process_name: Name of the process from psutil
    :param cmdline: cmdline from psutil
    :return: Tuple with three strings, which are path, cmd and arguments of the process
    """
    if cmdline[0].startswith(bare_process_name):
        path, cmd = "", cmdline[0]
    else:
        path, cmd = os.path.split(cmdline[0])
    arguments = ' '.join(cmdline[1:])
    return path, cmd, arguments


class ProcesslistPlugin(GlancesPluginModel):
    """Glances' processes plugin.

    stats is a list
    """

    # Default list of processes stats to be grabbed / displayed
    # Can be altered by glances_processes.disable_stats
    enable_stats = [
        'cpu_percent',
        'memory_percent',
        'memory_info',  # vms and rss
        'pid',
        'username',
        'cpu_times',
        'num_threads',
        'nice',
        'status',
        'io_counters',  # ior and iow
        'cmdline',
    ]

    # Define the header layout of the processes list columns
    layout_header = {
        'cpu': '{:<6} ',
        'mem': '{:<5} ',
        'virt': '{:<5} ',
        'res': '{:<5} ',
        'pid': '{:>{width}} ',
        'user': '{:<10} ',
        'time': '{:>8} ',
        'thread': '{:<3} ',
        'nice': '{:>3} ',
        'status': '{:>1} ',
        'ior': '{:>4} ',
        'iow': '{:<4} ',
        'command': '{} {}',
    }

    # Define the stat layout of the processes list columns
    layout_stat = {
        'cpu': '{:<6.1f}',
        'cpu_no_digit': '{:<6.0f}',
        'mem': '{:<5.1f} ',
        'virt': '{:<5} ',
        'res': '{:<5} ',
        'pid': '{:>{width}} ',
        'user': '{:<10} ',
        'time': '{:>8} ',
        'thread': '{:<3} ',
        'nice': '{:>3} ',
        'status': '{:>1} ',
        'ior': '{:>4} ',
        'iow': '{:<4} ',
        'command': '{}',
        'name': '[{}]',
    }

    def __init__(self, args=None, config=None):
        """Init the plugin."""
        super().__init__(args=args, config=config, fields_description=fields_description, stats_init_value=[])

        # We want to display the stat in the curse interface
        self.display_curse = True

        # Trying to display proc time
        self.tag_proc_time = True

        # Call CorePlugin to get the core number (needed when not in IRIX mode / Solaris mode)
        try:
            self.nb_log_core = CorePlugin(args=self.args).update()["log"]
        except Exception:
            self.nb_log_core = 0

        # Get the max values (dict)
        self.max_values = copy.deepcopy(glances_processes.max_values())

        # Get the maximum PID number
        # Use to optimize space (see https://github.com/nicolargo/glances/issues/959)
        self.pid_max = glances_processes.pid_max

        # Load the config file
        self.load(args, config)

        # The default sort key could also be overwrite by command line (see #1903)
        if args and args.sort_processes_key is not None:
            glances_processes.set_sort_key(args.sort_processes_key, False)

        # Note: 'glances_processes' is already init in the processes.py script

    def load(self, args, config):
        # Set the default sort key if it is defined in the configuration file
        if config is None or 'processlist' not in config.as_dict():
            return
        if 'sort_key' in config.as_dict()['processlist']:
            logger.debug(
                'Configuration overwrites processes sort key by {}'.format(config.as_dict()['processlist']['sort_key'])
            )
            glances_processes.set_sort_key(config.as_dict()['processlist']['sort_key'], False)
        if 'export' in config.as_dict()['processlist']:
            glances_processes.export_process_filter = config.as_dict()['processlist']['export']
            if args.export:
                logger.info("Export process filter is set to: {}".format(config.as_dict()['processlist']['export']))
        if 'disable_stats' in config.as_dict()['processlist']:
            logger.info(
                'Followings processes stats wil not be displayed: {}'.format(
                    config.as_dict()['processlist']['disable_stats']
                )
            )
            glances_processes.disable_stats = config.as_dict()['processlist']['disable_stats'].split(',')

    def get_key(self):
        """Return the key of the list."""
        return 'pid'

    def update(self):
        """Update processes stats using the input method."""
        # Update the stats
        if self.input_method == 'local':
            # Update stats using the standard system lib
            # Note: Update is done in the processcount plugin
            # Just return the result
            stats = glances_processes.get_list()
        else:
            stats = self.get_init_value()

        # Get the max values (dict)
        # Use Deep copy to avoid change between update and display
        self.max_values = copy.deepcopy(glances_processes.max_values())

        # Update the stats
        self.stats = stats

        return self.stats

    def get_export(self):
        """Return the processes list to export.
        Not all the processeses are exported.
        Only the one defined in the Glances configuration file (see #794 for details).
        """
        return glances_processes.get_export()

    def get_nice_alert(self, value):
        """Return the alert relative to the Nice configuration list"""
        value = str(value)
        if self.get_limit('nice_critical') and value in self.get_limit('nice_critical'):
            return 'CRITICAL'
        if self.get_limit('nice_warning') and value in self.get_limit('nice_warning'):
            return 'WARNING'
        if self.get_limit('nice_careful') and value in self.get_limit('nice_careful'):
            return 'CAREFUL'
        if self.get_limit('nice_ok') and value in self.get_limit('nice_ok'):
            return 'OK'

        return 'DEFAULT'

    def get_status_alert(self, value):
        """Return the alert relative to the Status configuration list"""
        value = str(value)
        if self.get_limit('status_critical') and value in self.get_limit('status_critical'):
            return 'CRITICAL'
        if self.get_limit('status_warning') and value in self.get_limit('status_warning'):
            return 'WARNING'
        if self.get_limit('status_careful') and value in self.get_limit('status_careful'):
            return 'CAREFUL'
        if self.get_limit('status_ok') and value in self.get_limit('status_ok'):
            return 'OK'

        return 'OK' if value == 'R' else 'DEFAULT'

    def _get_process_curses_cpu_percent(self, p, selected, args):
        """Return process CPU curses"""
        if key_exist_value_not_none_not_v('cpu_percent', p, ''):
            cpu_layout = self.layout_stat['cpu'] if p['cpu_percent'] < 100 else self.layout_stat['cpu_no_digit']
            if args.disable_irix and self.nb_log_core != 0:
                msg = cpu_layout.format(p['cpu_percent'] / float(self.nb_log_core))
            else:
                msg = cpu_layout.format(p['cpu_percent'])
            alert = self.get_alert(
                p['cpu_percent'],
                highlight_zero=True,
                is_max=(p['cpu_percent'] == self.max_values['cpu_percent']),
                header="cpu",
            )
            ret = self.curse_add_line(msg, alert)
        else:
            msg = self.layout_header['cpu'].format('?')
            ret = self.curse_add_line(msg)
        return ret

    def _get_process_curses_memory_percent(self, p, selected, args):
        """Return process MEM curses"""
        if key_exist_value_not_none_not_v('memory_percent', p, ''):
            msg = self.layout_stat['mem'].format(p['memory_percent'])
            alert = self.get_alert(
                p['memory_percent'],
                highlight_zero=True,
                is_max=(p['memory_percent'] == self.max_values['memory_percent']),
                header="mem",
            )
            ret = self.curse_add_line(msg, alert)
        else:
            msg = self.layout_header['mem'].format('?')
            ret = self.curse_add_line(msg)
        return ret

    def _get_process_curses_vms(self, p, selected, args):
        """Return process VMS curses"""
        if key_exist_value_not_none_not_v('memory_info', p, '', 1) and 'vms' in p['memory_info']:
            msg = self.layout_stat['virt'].format(self.auto_unit(p['memory_info']['vms'], low_precision=False))
            ret = self.curse_add_line(msg, optional=True)
        else:
            msg = self.layout_header['virt'].format('?')
            ret = self.curse_add_line(msg)
        return ret

    def _get_process_curses_rss(self, p, selected, args):
        """Return process RSS curses"""
        if key_exist_value_not_none_not_v('memory_info', p, '', 0) and 'rss' in p['memory_info']:
            msg = self.layout_stat['res'].format(self.auto_unit(p['memory_info']['rss'], low_precision=False))
            ret = self.curse_add_line(msg, optional=True)
        else:
            msg = self.layout_header['res'].format('?')
            ret = self.curse_add_line(msg)
        return ret

    def _get_process_curses_memory_info(self, p, selected, args):
        ret = []
        if not self.get_conf_value('disable_virtual_memory', convert_bool=True, default=False):
            ret.append(self._get_process_curses_vms(p, selected, args))
        ret.append(self._get_process_curses_rss(p, selected, args))
        return ret

    def _get_process_curses_pid(self, p, selected, args):
        """Return process PID curses"""
        # Display processes, so the PID should be displayed
        msg = self.layout_stat['pid'].format(p['pid'], width=self._max_pid_size())
        return self.curse_add_line(msg)

    def _get_process_curses_username(self, p, selected, args):
        """Return process username curses"""
        if 'username' in p:
            # docker internal users are displayed as ints only, therefore str()
            # Correct issue #886 on Windows OS
            msg = self.layout_stat['user'].format(str(p['username'])[:9])
        else:
            msg = self.layout_header['user'].format('?')
        return self.curse_add_line(msg)

    def _get_process_curses_cpu_times(self, p, selected, args):
        """Return process time curses"""
        cpu_times = p['cpu_times']
        try:
            # Sum user and system time
            user_system_time = cpu_times['user'] + cpu_times['system']
        except (OverflowError, TypeError, KeyError):
            # Catch OverflowError on some Amazon EC2 server
            # See https://github.com/nicolargo/glances/issues/87
            # Also catch TypeError on macOS
            # See: https://github.com/nicolargo/glances/issues/622
            # Also catch KeyError (as no stats be present for processes of other users)
            # See: https://github.com/nicolargo/glances/issues/2831
            # logger.debug("Cannot get TIME+ ({})".format(e))
            msg = self.layout_header['time'].format('?')
            return self.curse_add_line(msg, optional=True)

        hours, minutes, seconds = seconds_to_hms(user_system_time)
        if hours > 99:
            msg = f'{hours:<7}h'
        elif 0 < hours < 100:
            msg = f'{hours}h{minutes}:{seconds}'
        else:
            msg = f'{minutes}:{seconds}'

        msg = self.layout_stat['time'].format(msg)
        if hours > 0:
            return self.curse_add_line(msg, decoration='CPU_TIME', optional=True)

        return self.curse_add_line(msg, optional=True)

    def _get_process_curses_num_threads(self, p, selected, args):
        """Return process thread curses"""
        if 'num_threads' in p:
            num_threads = p['num_threads']
            if num_threads is None:
                num_threads = '?'
            msg = self.layout_stat['thread'].format(num_threads)
        else:
            msg = self.layout_header['thread'].format('?')
        return self.curse_add_line(msg)

    def _get_process_curses_nice(self, p, selected, args):
        """Return process nice curses"""
        if 'nice' in p:
            nice = p['nice']
            if nice is None:
                nice = '?'
            msg = self.layout_stat['nice'].format(nice)
            ret = self.curse_add_line(msg, decoration=self.get_nice_alert(nice))
        else:
            msg = self.layout_header['nice'].format('?')
            ret = self.curse_add_line(msg)
        return ret

    def _get_process_curses_status(self, p, selected, args):
        """Return process status curses"""
        if 'status' in p:
            status = p['status']
            msg = self.layout_stat['status'].format(status)
            ret = self.curse_add_line(msg, decoration=self.get_status_alert(status))
            # if status == 'R':
            #     ret = self.curse_add_line(msg, decoration='STATUS')
            # else:
            #     ret = self.curse_add_line(msg)
        else:
            msg = self.layout_header['status'].format('?')
            ret = self.curse_add_line(msg)
        return ret

    def _get_process_curses_io_read_write(self, p, selected, args, rorw='ior'):
        """Return process IO Read or Write curses"""
        if 'io_counters' in p and p['io_counters'][4] == 1 and p['time_since_update'] != 0:
            # Display rate if stats is available and io_tag ([4]) == 1
            # IO
            io = int(
                (p['io_counters'][0 if rorw == 'ior' else 1] - p['io_counters'][2 if rorw == 'ior' else 3])
                / p['time_since_update']
            )
            if io == 0:
                msg = self.layout_stat[rorw].format("0")
            else:
                msg = self.layout_stat[rorw].format(self.auto_unit(io, low_precision=True))
            ret = self.curse_add_line(msg, optional=True, additional=True)
        else:
            msg = self.layout_header[rorw].format("?")
            ret = self.curse_add_line(msg, optional=True, additional=True)
        return ret

    def _get_process_curses_io_counters(self, p, selected, args):
        return [
            self._get_process_curses_io_read_write(p, selected, args, rorw='ior'),
            self._get_process_curses_io_read_write(p, selected, args, rorw='iow'),
        ]

    def _get_process_curses_cmdline(self, p, selected, args):
        """Return process cmdline curses"""
        ret = []
        # If no command line for the process is available, fallback to the bare process name instead
        bare_process_name = p['name']
        cmdline = p.get('cmdline', '?')
        try:
            process_decoration = 'PROCESS_SELECTED' if (selected and not args.disable_cursor) else 'PROCESS'
            if cmdline:
                path, cmd, arguments = split_cmdline(bare_process_name, cmdline)
                # Manage end of line in arguments (see #1692)
                arguments = replace_special_chars(arguments)
                if os.path.isdir(path) and not args.process_short_name:
                    msg = self.layout_stat['command'].format(path) + os.sep
                    ret.append(self.curse_add_line(msg, splittable=True))
                    ret.append(self.curse_add_line(cmd, decoration=process_decoration, splittable=True))
                else:
                    msg = self.layout_stat['command'].format(cmd)
                    ret.append(self.curse_add_line(msg, decoration=process_decoration, splittable=True))
                if arguments:
                    msg = ' ' if args.cursor_process_name_position == 0 else unicode_message('THREE_DOTS')
                    msg += self.layout_stat['command'].format(arguments[args.cursor_process_name_position :])
                    ret.append(self.curse_add_line(msg, splittable=True))
            else:
                msg = self.layout_stat['name'].format(bare_process_name)
                ret.append(self.curse_add_line(msg, decoration=process_decoration, splittable=True))
        except (TypeError, UnicodeEncodeError) as e:
            # Avoid crash after running fine for several hours #1335
            logger.debug(f"Can not decode command line '{cmdline}' ({e})")
            ret.append(self.curse_add_line('', splittable=True))
        return ret

    def get_process_curses_data(self, p, selected, args):
        """Get curses data to display for a process.

        - p is the process to display
        - selected is a tag=True if p is the selected process
        """
        ret = [self.curse_new_line()]

        # When a process is selected:
        # * display a special character at the beginning of the line
        # * underline the command name
        ret.append(
            self.curse_add_line(
                unicode_message('PROCESS_SELECTOR') if (selected and not args.disable_cursor) else ' ', 'SELECTED'
            )
        )

        for stat in [i for i in self.enable_stats if i not in glances_processes.disable_stats]:
            msg = getattr(self, f'_get_process_curses_{stat}')(p, selected, args)
            if isinstance(msg, list):
                # ex: _get_process_curses_command return a list, so extend
                ret.extend(msg)
            else:
                # ex: _get_process_curses_cpu return a dict, so append
                ret.append(msg)

        return ret

    def is_selected_process(self, args):
        return (
            args.is_standalone
            and self.args.enable_process_extended
            and args.cursor_position is not None
            and glances_processes.extended_process is not None
        )

    def msg_curse(self, args=None, max_width=None):
        """Return the dict to display in the curse interface."""
        # Init the return message
        ret = []

        # Only process if stats exist and display plugin enable...
        if not self.stats or args.disable_process:
            return ret

        # Compute the sort key
        process_sort_key = glances_processes.sort_key
        processes_list_sorted = self._sort_stats(process_sort_key)

        # Display extended stats for selected process
        #############################################

        if self.is_selected_process(args):
            self._msg_curse_extended_process(ret, glances_processes.extended_process)

        # Display others processes list
        ###############################

        # Header
        self._msg_curse_header(ret, process_sort_key, args)

        # Process list
        # Loop over processes (sorted by the sort key previously compute)
        # This is a Glances bottleneck (see flame graph),
        # TODO: get_process_curses_data should be optimized
        for position, process in enumerate(processes_list_sorted):
            ret.extend(self.get_process_curses_data(process, position == args.cursor_position, args))

        # A filter is set Display the stats summaries
        if glances_processes.process_filter is not None:
            if args.reset_minmax_tag:
                args.reset_minmax_tag = not args.reset_minmax_tag
                self._mmm_reset()
            self._msg_curse_sum(ret, args=args)
            self._msg_curse_sum(ret, mmm='min', args=args)
            self._msg_curse_sum(ret, mmm='max', args=args)

        # Return the message with decoration
        return ret

    def _msg_curse_extended_process(self, ret, p):
        """Get extended curses data for the selected process (see issue #2225)

        The result depends of the process type (process or thread).

        Input p is a dict with the following keys:
        {'status': 'S',
         'memory_info': {'rss': 466890752, 'vms': 3365347328, 'shared': 68153344,
                         'text': 659456, 'lib': 0, 'data': 774647808, 'dirty': 0],
         'pid': 4980,
         'io_counters': [165385216, 0, 165385216, 0, 1],
         'num_threads': 20,
         'nice': 0,
         'memory_percent': 5.958135664449709,
         'cpu_percent': 0.0,
         'gids': {'real': 1000, 'effective': 1000, 'saved': 1000},
         'cpu_times': {'user': 696.38, 'system': 119.98, 'children_user': 0.0,
                       'children_system': 0.0, 'iowait': 0.0),
         'name': 'WebExtensions',
         'key': 'pid',
         'time_since_update': 2.1997854709625244,
         'cmdline': ['/snap/firefox/2154/usr/lib/firefox/firefox', '-contentproc', '-childID', '...'],
         'username': 'nicolargo',
         'cpu_min': 0.0,
         'cpu_max': 7.0,
         'cpu_mean': 3.2}
        """
        self._msg_curse_extended_process_thread(ret, p)

    def add_title_line(self, ret, prog):
        ret.append(self.curse_add_line("Pinned thread ", "TITLE"))
        ret.append(self.curse_add_line(prog.get('name', ''), "UNDERLINE"))
        ret.append(self.curse_add_line(" ('e' to unpin)"))

        return ret

    def add_cpu_line(self, ret, prog):
        ret.append(self.curse_new_line())
        ret.append(self.curse_add_line(' CPU Min/Max/Mean: '))
        msg = '{: >7.1f}{: >7.1f}{: >7.1f}%'.format(
            prog.get('cpu_min', 0), prog.get('cpu_max', 0), prog.get('cpu_mean', 0)
        )
        ret.append(self.curse_add_line(msg, decoration='INFO'))

        return ret

    def maybe_add_cpu_affinity_line(self, ret, prog):
        if 'cpu_affinity' in prog and prog['cpu_affinity'] is not None:
            ret.append(self.curse_add_line(' Affinity: '))
            ret.append(self.curse_add_line(str(len(prog.get('cpu_affinity', []))), decoration='INFO'))
            ret.append(self.curse_add_line(' cores', decoration='INFO'))

        return ret

    def add_ionice_line(self, headers, default):
        def add_ionice_using_matches(msg, v):
            return msg + headers.get(v, default(v))

        return add_ionice_using_matches

    def get_headers(self, k):
        # Linux: The scheduling class. 0 for none, 1 for real time, 2 for best-effort, 3 for idle.
        default = {0: 'No specific I/O priority', 1: k + 'Real Time', 2: k + 'Best Effort', 3: k + 'IDLE'}

        # Windows: On Windows only ioclass is used and it can be set to 2 (normal), 1 (low) or 0 (very low).
        windows = {0: k + 'Very Low', 1: k + 'Low', 2: 'No specific I/O priority'}

        return windows if WINDOWS else default

    def maybe_add_ionice_line(self, ret, prog):
        if 'ionice' in prog and prog['ionice'] is not None and hasattr(prog['ionice'], 'ioclass'):
            msg = ' IO nice: '
            k = 'Class is '
            v = prog['ionice'].ioclass

            def default(v):
                return k + str(v)

The variable k does not seem to be defined in case 'ionice' in prog and SubscriptNode is not None and hasattr(SubscriptNode, 'ioclass') on line 641 is False. Are you sure this can never be the case?

            headers = self.get_headers(k)
            msg = self.add_ionice_line(headers, default)(msg, v)
            #  value is a number which goes from 0 to 7.
            # The higher the value, the lower the I/O priority of the process.
            if hasattr(prog['ionice'], 'value') and prog['ionice'].value != 0:
                msg += ' (value {}/7)'.format(str(prog['ionice'].value))
            ret.append(self.curse_add_line(msg, splittable=True))

        return ret

    def maybe_add_memory_swap_line(self, ret, prog):
        if 'memory_swap' in prog and prog['memory_swap'] is not None:
            ret.append(
                self.curse_add_line(
                    self.auto_unit(prog.get('memory_swap', 0), low_precision=False), decoration='INFO', splittable=True
                )
            )
            ret.append(self.curse_add_line(' swap ', splittable=True))

        return ret

    def add_memory_info_lines(self, ret, prog):
        for key, val in prog['memory_info'].items():
            ret.append(
                self.curse_add_line(
                    self.auto_unit(val, low_precision=False),
                    decoration='INFO',
                    splittable=True,
                )
            )
            ret.append(self.curse_add_line(' ' + key + ' ', splittable=True))

        return ret

    def add_memory_line(self, ret, prog):
        ret.append(self.curse_new_line())
        ret.append(self.curse_add_line(' MEM Min/Max/Mean: '))
        msg = '{: >7.1f}{: >7.1f}{: >7.1f}%'.format(
            prog.get('memory_min', 0), prog.get('memory_max', 0), prog.get('memory_mean', 0)
        )
        ret.append(self.curse_add_line(msg, decoration='INFO'))
        if 'memory_info' in prog and prog['memory_info'] is not None:
            ret.append(self.curse_add_line(' Memory info: '))
            steps = [self.add_memory_info_lines, self.maybe_add_memory_swap_line]
            ret = functools.reduce(lambda ret, step: step(ret, prog), steps, ret)

        return ret

    def add_io_and_network_lines(self, ret, prog):
        ret.append(self.curse_new_line())
        ret.append(self.curse_add_line(' Open: '))
        for stat_prefix in ['num_threads', 'num_fds', 'num_handles', 'tcp', 'udp']:
            if stat_prefix in prog and prog[stat_prefix] is not None:
                ret.append(self.curse_add_line(str(prog.get(stat_prefix, 0)), decoration='INFO'))
                ret.append(self.curse_add_line(' {} '.format(stat_prefix.replace('num_', ''))))
        return ret

    def _msg_curse_extended_process_thread(self, ret, prog):
        # `append_newlines` has dummy arguments for piping thru `functools.reduce`
        def append_newlines(ret, prog):
            (ret.append(self.curse_new_line()),)
            ret.append(self.curse_new_line())

            return ret

        steps = [
            self.add_title_line,
            self.add_cpu_line,
            self.maybe_add_cpu_affinity_line,
            self.maybe_add_ionice_line,
            self.add_memory_line,
            self.add_io_and_network_lines,
            append_newlines,
        ]

        functools.reduce(lambda ret, step: step(ret, prog), steps, ret)

    def _msg_curse_header(self, ret, process_sort_key, args=None):
        """Build the header and add it to the ret dict."""
        sort_style = 'SORT'

        display_stats = [i for i in self.enable_stats if i not in glances_processes.disable_stats]

        if 'cpu_percent' in display_stats:
            if args.disable_irix and 0 < self.nb_log_core < 10:
                msg = self.layout_header['cpu'].format('CPU%/' + str(self.nb_log_core))
            elif args.disable_irix and self.nb_log_core != 0:
                msg = self.layout_header['cpu'].format('CPUi')
            else:
                msg = self.layout_header['cpu'].format('CPU%')
            ret.append(self.curse_add_line(msg, sort_style if process_sort_key == 'cpu_percent' else 'DEFAULT'))

        if 'memory_percent' in display_stats:
            msg = self.layout_header['mem'].format('MEM%')
            ret.append(self.curse_add_line(msg, sort_style if process_sort_key == 'memory_percent' else 'DEFAULT'))
        if 'memory_info' in display_stats:
            if not self.get_conf_value('disable_virtual_memory', convert_bool=True, default=False):
                msg = self.layout_header['virt'].format('VIRT')
                ret.append(self.curse_add_line(msg, optional=True))
            msg = self.layout_header['res'].format('RES')
            ret.append(self.curse_add_line(msg, optional=True))
        if 'pid' in display_stats:
            msg = self.layout_header['pid'].format('PID', width=self._max_pid_size())
            ret.append(self.curse_add_line(msg))
        if 'username' in display_stats:
            msg = self.layout_header['user'].format('USER')
            ret.append(self.curse_add_line(msg, sort_style if process_sort_key == 'username' else 'DEFAULT'))
        if 'cpu_times' in display_stats:
            msg = self.layout_header['time'].format('TIME+')
            ret.append(
                self.curse_add_line(msg, sort_style if process_sort_key == 'cpu_times' else 'DEFAULT', optional=True)
            )
        if 'num_threads' in display_stats:
            msg = self.layout_header['thread'].format('THR')
            ret.append(self.curse_add_line(msg))
        if 'nice' in display_stats:
            msg = self.layout_header['nice'].format('NI')
            ret.append(self.curse_add_line(msg))
        if 'status' in display_stats:
            msg = self.layout_header['status'].format('S')
            ret.append(self.curse_add_line(msg))
        if 'io_counters' in display_stats:

This code seems to be duplicated in your project.

            msg = self.layout_header['ior'].format('R/s')
            ret.append(
                self.curse_add_line(
                    msg, sort_style if process_sort_key == 'io_counters' else 'DEFAULT', optional=True, additional=True
                )
            )
            msg = self.layout_header['iow'].format('W/s')
            ret.append(
                self.curse_add_line(
                    msg, sort_style if process_sort_key == 'io_counters' else 'DEFAULT', optional=True, additional=True
                )
            )
        if args.is_standalone and not args.disable_cursor:
            shortkey = "('e' to pin | 'k' to kill)"
        else:
            shortkey = ""
        if 'cmdline' in display_stats:
            msg = self.layout_header['command'].format("Command", shortkey)
            ret.append(self.curse_add_line(msg, sort_style if process_sort_key == 'name' else 'DEFAULT'))

    def _msg_curse_sum(self, ret, sep_char='_', mmm=None, args=None):

This code seems to be duplicated in your project.

        """
        Build the sum message (only when filter is on) and add it to the ret dict.

        :param ret: list of string where the message is added
        :param sep_char: define the line separation char
        :param mmm: display min, max, mean or current (if mmm=None)
        :param args: Glances args
        """
        ret.append(self.curse_new_line())
        if mmm is None:
            ret.append(self.curse_add_line(sep_char * 69))
            ret.append(self.curse_new_line())
        # CPU percent sum
        msg = ' '
        msg += self.layout_stat['cpu'].format(self._sum_stats('cpu_percent', mmm=mmm))
        ret.append(self.curse_add_line(msg, decoration=self._mmm_deco(mmm)))
        # MEM percent sum
        msg = self.layout_stat['mem'].format(self._sum_stats('memory_percent', mmm=mmm))
        ret.append(self.curse_add_line(msg, decoration=self._mmm_deco(mmm)))
        # VIRT and RES memory sum
        if (
            'memory_info' in self.stats[0]
            and self.stats[0]['memory_info'] is not None
            and self.stats[0]['memory_info'] != ''
        ):
            # VMS
            msg = self.layout_stat['virt'].format(
                self.auto_unit(self._sum_stats('memory_info', sub_key='vms', mmm=mmm), low_precision=False)
            )
            ret.append(self.curse_add_line(msg, decoration=self._mmm_deco(mmm), optional=True))
            # RSS
            msg = self.layout_stat['res'].format(
                self.auto_unit(self._sum_stats('memory_info', sub_key='rss', mmm=mmm), low_precision=False)
            )
            ret.append(self.curse_add_line(msg, decoration=self._mmm_deco(mmm), optional=True))
        else:
            msg = self.layout_header['virt'].format('')
            ret.append(self.curse_add_line(msg))
            msg = self.layout_header['res'].format('')
            ret.append(self.curse_add_line(msg))
        # PID
        msg = self.layout_header['pid'].format('', width=self._max_pid_size())
        ret.append(self.curse_add_line(msg))
        # USER
        msg = self.layout_header['user'].format('')
        ret.append(self.curse_add_line(msg))
        # TIME+
        msg = self.layout_header['time'].format('')
        ret.append(self.curse_add_line(msg, optional=True))
        # THREAD
        msg = self.layout_header['thread'].format('')
        ret.append(self.curse_add_line(msg))
        # NICE
        msg = self.layout_header['nice'].format('')
        ret.append(self.curse_add_line(msg))
        # STATUS
        msg = self.layout_header['status'].format('')
        ret.append(self.curse_add_line(msg))
        # IO read/write
        if 'io_counters' in self.stats[0] and mmm is None:
            # IO read
            io_rs = int(
                (self._sum_stats('io_counters', 0) - self._sum_stats('io_counters', sub_key=2, mmm=mmm))
                / self.stats[0]['time_since_update']
            )
            if io_rs == 0:
                msg = self.layout_stat['ior'].format('0')
            else:
                msg = self.layout_stat['ior'].format(self.auto_unit(io_rs, low_precision=True))
            ret.append(self.curse_add_line(msg, decoration=self._mmm_deco(mmm), optional=True, additional=True))
            # IO write
            io_ws = int(
                (self._sum_stats('io_counters', 1) - self._sum_stats('io_counters', sub_key=3, mmm=mmm))
                / self.stats[0]['time_since_update']
            )
            if io_ws == 0:
                msg = self.layout_stat['iow'].format('0')
            else:
                msg = self.layout_stat['iow'].format(self.auto_unit(io_ws, low_precision=True))
            ret.append(self.curse_add_line(msg, decoration=self._mmm_deco(mmm), optional=True, additional=True))
        else:
            msg = self.layout_header['ior'].format('')
            ret.append(self.curse_add_line(msg, optional=True, additional=True))
            msg = self.layout_header['iow'].format('')
            ret.append(self.curse_add_line(msg, optional=True, additional=True))
        if mmm is None:
            msg = '< {}'.format('current')
            ret.append(self.curse_add_line(msg, optional=True))
        else:
            msg = f'< {mmm}'
            ret.append(self.curse_add_line(msg, optional=True))
            msg = '(\'M\' to reset)'
            ret.append(self.curse_add_line(msg, optional=True))

    def _mmm_deco(self, mmm):
        """Return the decoration string for the current mmm status."""
        if mmm is not None:
            return 'DEFAULT'
        return 'FILTER'

    def _mmm_reset(self):
        """Reset the MMM stats."""
        self.mmm_min = {}
        self.mmm_max = {}

    def _sum_stats(self, key, sub_key=None, mmm=None):
        """Return the sum of the stats value for the given key.

        :param sub_key: If sub_key is set, get the p[key][sub_key]
        :param mmm: display min, max, mean or current (if mmm=None)
        """
        # Compute stats summary
        ret = 0
        for p in self.stats:
            if key not in p:
                # Correct issue #1188
                continue
            if p[key] is None:
                # Correct https://github.com/nicolargo/glances/issues/1105#issuecomment-363553788
                continue
            if sub_key is None:
                ret += p[key]
            elif sub_key in p[key]:
                ret += p[key][sub_key]

        # Manage Min/Max/Mean
        mmm_key = self._mmm_key(key, sub_key)
        if mmm == 'min':
            try:
                if self.mmm_min[mmm_key] > ret:
                    self.mmm_min[mmm_key] = ret
            except AttributeError:
                self.mmm_min = {}
                return 0
            except KeyError:
                self.mmm_min[mmm_key] = ret
            ret = self.mmm_min[mmm_key]
        elif mmm == 'max':
            try:
                if self.mmm_max[mmm_key] < ret:
                    self.mmm_max[mmm_key] = ret
            except AttributeError:
                self.mmm_max = {}
                return 0
            except KeyError:
                self.mmm_max[mmm_key] = ret
            ret = self.mmm_max[mmm_key]

        return ret

    def _mmm_key(self, key, sub_key):
        ret = key
        if sub_key is not None:
            ret += str(sub_key)
        return ret

    def _sort_stats(self, sorted_by=None):
        """Return the stats (dict) sorted by (sorted_by)."""
        return sort_stats(self.stats, sorted_by, reverse=glances_processes.sort_reverse)

    def _max_pid_size(self):
        """Return the maximum PID size in number of char."""
        if self.pid_max is not None:
            return len(str(self.pid_max))

        # By default return 5 (corresponding to 99999 PID number)
        return 5