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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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I am your father... |
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...for all Glances Application Monitoring Processes (AMP). |
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AMP (Application Monitoring Process) |
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A Glances AMP is a Python script called (every *refresh* seconds) if: |
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- the AMP is *enabled* in the Glances configuration file |
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- a process is running (match the *regex* define in the configuration file) |
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The script should define a Amp (GlancesAmp) class with, at least, an update method. |
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The update method should call the set_result method to set the AMP return string. |
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The return string is a string with one or more line (\n between lines). |
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If the *one_line* var is true then the AMP will be displayed in one line. |
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""" |
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from glances.compat import u, b, n, nativestr |
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from glances.timer import Timer |
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from glances.logger import logger |
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class GlancesAmp(object): |
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"""Main class for Glances AMP.""" |
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NAME = '?' |
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VERSION = '?' |
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DESCRIPTION = '?' |
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AUTHOR = '?' |
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EMAIL = '?' |
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def __init__(self, name=None, args=None): |
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"""Init AMP classe.""" |
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logger.debug("AMP - Init {} version {}".format(self.NAME, self.VERSION)) |
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# AMP name (= module name without glances_) |
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if name is None: |
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self.amp_name = self.__class__.__module__[len('glances_'):] |
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else: |
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self.amp_name = name |
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# Init the args |
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self.args = args |
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# Init the configs |
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self.configs = {} |
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# A timer is needed to only update every refresh seconds |
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# Init to 0 in order to update the AMP on startup |
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self.timer = Timer(0) |
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def load_config(self, config): |
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"""Load AMP parameters from the configuration file.""" |
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# Read AMP confifuration. |
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# For ex, the AMP foo should have the following section: |
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# |
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# [foo] |
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# enable=true |
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# regex=\/usr\/bin\/nginx |
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# refresh=60 |
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# |
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# and optionnaly: |
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# |
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# one_line=false |
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# option1=opt1 |
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# ... |
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# |
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amp_section = 'amp_' + self.amp_name |
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if (hasattr(config, 'has_section') and |
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config.has_section(amp_section)): |
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logger.debug("AMP - {}: Load configuration".format(self.NAME)) |
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for param, _ in config.items(amp_section): |
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try: |
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self.configs[param] = config.get_float_value(amp_section, param) |
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except ValueError: |
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self.configs[param] = config.get_value(amp_section, param).split(',') |
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if len(self.configs[param]) == 1: |
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self.configs[param] = self.configs[param][0] |
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logger.debug("AMP - {}: Load parameter: {} = {}".format(self.NAME, param, self.configs[param])) |
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else: |
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logger.debug("AMP - {}: Can not find section {} in the configuration file".format(self.NAME, self.amp_name)) |
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return False |
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# enable, regex and refresh are mandatories |
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# if not configured then AMP is disabled |
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if self.enable(): |
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for k in ['regex', 'refresh']: |
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if k not in self.configs: |
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logger.warning("AMP - {}: Can not find configuration key {} in section {}".format(self.NAME, k, self.amp_name)) |
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self.configs['enable'] = 'false' |
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else: |
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logger.debug("AMP - {} is disabled".format(self.NAME)) |
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# Init the count to 0 |
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self.configs['count'] = 0 |
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return self.enable() |
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def get(self, key): |
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"""Generic method to get the item in the AMP configuration""" |
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if key in self.configs: |
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return self.configs[key] |
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else: |
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return None |
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def enable(self): |
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"""Return True|False if the AMP is enabled in the configuration file (enable=true|false).""" |
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ret = self.get('enable') |
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if ret is None: |
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return False |
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else: |
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return ret.lower().startswith('true') |
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def regex(self): |
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"""Return regular expression used to identified the current application.""" |
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return self.get('regex') |
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def refresh(self): |
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"""Return refresh time in seconds for the current application monitoring process.""" |
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return self.get('refresh') |
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def one_line(self): |
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"""Return True|False if the AMP shoukd be displayed in oneline (one_lineline=true|false).""" |
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ret = self.get('one_line') |
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if ret is None: |
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return False |
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else: |
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return ret.lower().startswith('true') |
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def time_until_refresh(self): |
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"""Return time in seconds until refresh.""" |
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return self.timer.get() |
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def should_update(self): |
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"""Return True is the AMP should be updated: |
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- AMP is enable |
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- only update every 'refresh' seconds |
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""" |
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if self.timer.finished(): |
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self.timer.set(self.refresh()) |
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self.timer.reset() |
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return self.enable() |
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return False |
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def set_count(self, count): |
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"""Set the number of processes matching the regex""" |
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self.configs['count'] = count |
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def count(self): |
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"""Get the number of processes matching the regex""" |
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return self.get('count') |
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def count_min(self): |
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"""Get the minimum number of processes""" |
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return self.get('countmin') |
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def count_max(self): |
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"""Get the maximum number of processes""" |
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return self.get('countmax') |
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def set_result(self, result, separator=''): |
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"""Store the result (string) into the result key of the AMP |
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if one_line is true then replace \n by separator |
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""" |
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if self.one_line(): |
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self.configs['result'] = u(result).replace('\n', separator) |
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else: |
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self.configs['result'] = u(result) |
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def result(self): |
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""" Return the result of the AMP (as a string)""" |
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ret = self.get('result') |
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if ret is not None: |
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ret = u(ret) |
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return ret |
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def update_wrapper(self, process_list): |
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"""Wrapper for the children update""" |
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# Set the number of running process |
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self.set_count(len(process_list)) |
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# Call the children update method |
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if self.should_update(): |
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return self.update(process_list) |
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else: |
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return self.result() |
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nicolargo /
glances
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