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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""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 criticality status
# - key: stat_name
# - value: criticality
# 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 criticality."""
try:
return self.status[stat_name]
except KeyError:
return None
def set(self, stat_name, criticality):
"""Set the stat_name to criticality."""
self.status[stat_name] = criticality
def run(self, stat_name, criticality, commands, repeat, mustache_dict=None):
"""Run the commands (in background).
:param stat_name: plugin_name (+ header)
:param criticality: criticality of the trigger
:param commands: a list of command line with optional {{mustache}}
:param repeat: If True, then repeat the action
:param mustache_dict: Plugin stats (can be use within {{mustache}})
:return: True if the commands have been ran.
"""
if (self.get(stat_name) == criticality 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, criticality, 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, criticality, cmd_full))
try:
ret = secure_popen(cmd_full)
except OSError as e:
logger.error("Action error for {} ({}): {}".format(stat_name, criticality, e))
else:
logger.debug("Action result for {} ({}): {}".format(stat_name, criticality, ret))
self.set(stat_name, criticality)
return True