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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
#
# Glances is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Glances is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Manage on alert actions."""
from glances.logger import logger
from glances.timer import Timer
from glances.secure import secure_popen
try:
import chevron
except ImportError:
logger.debug("Chevron library not found (action scripts won't work)")
chevron_tag = False
else:
chevron_tag = True
class GlancesActions(object):
"""This class manage action if an alert is reached."""
def __init__(self, args=None):
"""Init GlancesActions class."""
# Dict with the criticity status
# - key: stat_name
# - value: criticity
# Goal: avoid to execute the same command twice
self.status = {}
# Add a timer to avoid any trigger when Glances is started (issue#732)
# Action can be triggered after refresh * 2 seconds
if hasattr(args, 'time'):
self.start_timer = Timer(args.time * 2)
else:
self.start_timer = Timer(3)
def get(self, stat_name):
"""Get the stat_name criticity."""
try:
return self.status[stat_name]
except KeyError:
return None
def set(self, stat_name, criticity):
"""Set the stat_name to criticity."""
self.status[stat_name] = criticity
def run(self, stat_name, criticity, commands, repeat, mustache_dict=None):
"""Run the commands (in background).
- stats_name: plugin_name (+ header)
- criticity: criticity of the trigger
- commands: a list of command line with optional {{mustache}}
- If True, then repeat the action
- mustache_dict: Plugin stats (can be use within {{mustache}})
Return True if the commands have been ran.
"""
if (self.get(stat_name) == criticity and not repeat) or \
not self.start_timer.finished():
# Action already executed => Exit
return False
logger.debug("{} action {} for {} ({}) with stats {}".format(
"Repeat" if repeat else "Run",
commands, stat_name, criticity, mustache_dict))
# Run all actions in background
for cmd in commands:
# Replace {{arg}} by the dict one (Thk to {Mustache})
if chevron_tag:
cmd_full = chevron.render(cmd, mustache_dict)
else:
cmd_full = cmd
# Execute the action
logger.info("Action triggered for {} ({}): {}".format(stat_name,
criticity,
cmd_full))
try:
ret = secure_popen(cmd_full)
except OSError as e:
logger.error("Action error for {} ({}): {}".format(stat_name,
criticity,
e))
else:
logger.debug("Action result for {} ({}): {}".format(stat_name,
criticity,
ret))
self.set(stat_name, criticity)
return True
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