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# -*- coding: utf-8 -*- |
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# |
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# This file is part of Glances. |
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# |
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# Copyright (C) 2019 Nicolargo <[email protected]> |
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# |
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# Glances is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU Lesser General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Glances is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU Lesser General Public License for more details. |
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# |
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# You should have received a copy of the GNU Lesser General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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""" |
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Systemd AMP |
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=========== |
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Monitor the state of the systemd system and service (unit) manager. |
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How to read the stats |
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--------------------- |
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active: Number of active units. This is usually a fairly basic way to tell if the |
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unit has started successfully or not. |
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loaded: Number of loaded units (unit's configuration has been parsed by systemd). |
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failed: Number of units with an active failed status. |
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Source reference: https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units |
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Configuration file example |
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-------------------------- |
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[amp_systemd] |
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# Systemd |
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enable=true |
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regex=\/usr\/lib\/systemd\/systemd |
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refresh=60 |
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one_line=true |
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systemctl_cmd=/usr/bin/systemctl --plain |
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""" |
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from subprocess import check_output, CalledProcessError |
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from glances.logger import logger |
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from glances.compat import iteritems, to_ascii |
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from glances.amps.glances_amp import GlancesAmp |
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class Amp(GlancesAmp): |
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"""Glances' Systemd AMP.""" |
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NAME = 'Systemd' |
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VERSION = '1.0' |
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DESCRIPTION = 'Get services list from systemctl (systemd)' |
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AUTHOR = 'Nicolargo' |
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EMAIL = '[email protected]' |
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# def __init__(self, args=None): |
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# """Init the AMP.""" |
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# super(Amp, self).__init__(args=args) |
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def update(self, process_list): |
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"""Update the AMP""" |
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# Get the systemctl status |
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logger.debug('{}: Update stats using systemctl {}'.format(self.NAME, self.get('systemctl_cmd'))) |
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try: |
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res = check_output(self.get('systemctl_cmd').split()) |
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except (OSError, CalledProcessError) as e: |
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logger.debug('{}: Error while executing systemctl ({})'.format(self.NAME, e)) |
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else: |
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status = {} |
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# For each line |
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for r in to_ascii(res).split('\n')[1:-8]: |
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# Split per space .* |
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column = r.split() |
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if len(column) > 3: |
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# load column |
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for c in range(1, 3): |
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try: |
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status[column[c]] += 1 |
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except KeyError: |
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status[column[c]] = 1 |
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# Build the output (string) message |
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output = 'Services\n' |
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for k, v in iteritems(status): |
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output += '{}: {}\n'.format(k, v) |
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self.set_result(output, separator=' ') |
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return self.result() |
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Escape sequences in Python are generally interpreted according to rules similar to standard C. Only if strings are prefixed with
r
orR
are they interpreted as regular expressions.The escape sequence that was used indicates that you might have intended to write a regular expression.
Learn more about the available escape sequences. in the Python documentation.