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106 lines
3.6 KiB
106 lines
3.6 KiB
# -*- 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) 2018 Nicolargo <nicolas@nicolargo.com>
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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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"""Manage on alert actions."""
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from subprocess import Popen
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from glances.logger import logger
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from glances.timer import Timer
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try:
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import pystache
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except ImportError:
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logger.debug("Pystache library not found (action scripts won't work)")
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pystache_tag = False
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else:
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pystache_tag = True
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class GlancesActions(object):
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"""This class manage action if an alert is reached."""
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def __init__(self, args=None):
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"""Init GlancesActions class."""
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# Dict with the criticity status
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# - key: stat_name
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# - value: criticity
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# Goal: avoid to execute the same command twice
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self.status = {}
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# Add a timer to avoid any trigger when Glances is started (issue#732)
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# Action can be triggered after refresh * 2 seconds
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if hasattr(args, 'time'):
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self.start_timer = Timer(args.time * 2)
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else:
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self.start_timer = Timer(3)
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def get(self, stat_name):
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"""Get the stat_name criticity."""
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try:
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return self.status[stat_name]
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except KeyError:
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return None
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def set(self, stat_name, criticity):
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"""Set the stat_name to criticity."""
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self.status[stat_name] = criticity
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def run(self, stat_name, criticity, commands, repeat, mustache_dict=None):
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"""Run the commands (in background).
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- stats_name: plugin_name (+ header)
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- criticity: criticity of the trigger
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- commands: a list of command line with optional {{mustache}}
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- If True, then repeat the action
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- mustache_dict: Plugin stats (can be use within {{mustache}})
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Return True if the commands have been ran.
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"""
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if (self.get(stat_name) == criticity and not repeat) or \
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not self.start_timer.finished():
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# Action already executed => Exit
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return False
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logger.debug("{} action {} for {} ({}) with stats {}".format(
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"Repeat" if repeat else "Run",
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commands, stat_name, criticity, mustache_dict))
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# Run all actions in background
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for cmd in commands:
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# Replace {{arg}} by the dict one (Thk to {Mustache})
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if pystache_tag:
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cmd_full = pystache.render(cmd, mustache_dict)
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else:
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cmd_full = cmd
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# Execute the action
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logger.info("Action triggered for {} ({}): {}".format(stat_name,
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criticity,
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cmd_full))
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logger.debug("Stats value for the trigger: {}".format(
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mustache_dict))
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try:
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Popen(cmd_full, shell=True)
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except OSError as e:
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logger.error("Can't execute the action ({})".format(e))
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self.set(stat_name, criticity)
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return True
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