490 lines
16 KiB
Python
490 lines
16 KiB
Python
#!/usr/bin/env python3
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# PluginInstance.py - Class implementing a PVC monitoring instance
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2022 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import concurrent.futures
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import time
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import importlib.util
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from os import walk
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from datetime import datetime
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from json import dumps
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from apscheduler.schedulers.background import BackgroundScheduler
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class PluginError(Exception):
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"""
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An exception that results from a plugin failing setup
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"""
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pass
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class PluginResult(object):
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def __init__(self, zkhandler, config, logger, this_node, plugin_name):
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self.zkhandler = zkhandler
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self.config = config
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self.logger = logger
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self.this_node = this_node
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self.plugin_name = plugin_name
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self.current_time = int(time.time())
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self.health_delta = 0
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self.message = "N/A"
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self.data = {}
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self.runtime = "0.00"
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def set_health_delta(self, new_delta):
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self.health_delta = new_delta
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def set_message(self, new_message):
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self.message = new_message
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def set_data(self, new_data):
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self.data = new_data
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def set_runtime(self, new_runtime):
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self.runtime = new_runtime
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def to_zookeeper(self):
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self.zkhandler.write(
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[
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.name",
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self.plugin_name,
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),
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self.plugin_name,
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.last_run",
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self.plugin_name,
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),
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self.current_time,
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.health_delta",
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self.plugin_name,
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),
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self.health_delta,
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.message",
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self.plugin_name,
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),
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self.message,
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.data",
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self.plugin_name,
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),
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dumps(self.data),
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.runtime",
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self.plugin_name,
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),
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self.runtime,
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),
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]
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)
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class MonitoringPlugin(object):
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def __init__(self, zkhandler, config, logger, this_node, plugin_name):
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self.zkhandler = zkhandler
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self.config = config
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self.logger = logger
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self.this_node = this_node
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self.plugin_name = plugin_name
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self.plugin_result = PluginResult(
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self.zkhandler,
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self.config,
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self.logger,
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self.this_node,
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self.plugin_name,
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)
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def __str__(self):
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return self.plugin_name
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#
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# Helper functions; exposed to child MonitoringPluginScript instances
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#
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def log(self, message, state="d"):
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"""
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Log a message to the PVC logger instance using the plugin name as a prefix
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Takes "state" values as defined by the PVC logger instance, defaulting to debug:
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"d": debug
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"i": informational
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"t": tick/keepalive
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"w": warning
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"e": error
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"""
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if state == "d" and not self.config["debug"]:
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return
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self.logger.out(message, state=state, prefix=self.plugin_name)
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#
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# Primary class functions; implemented by the individual plugins
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#
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def setup(self):
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"""
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setup(): Perform setup of the plugin; run once during daemon startup
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This step is optional and should be used sparingly.
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If you wish for the plugin to not load in certain conditions, do any checks here
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and return a non-None failure message to indicate the error.
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"""
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pass
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def run(self, coordinator_state=None):
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"""
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run(): Run the plugin, returning a PluginResult object
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The {coordinator_state} can be used to check if this is a "primary" coordinator, "secondary" coordinator, or "client" (non-coordinator)
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"""
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return self.plugin_result
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def cleanup(self):
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"""
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cleanup(): Clean up after the plugin; run once during daemon shutdown
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OPTIONAL
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"""
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pass
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class MonitoringInstance(object):
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def __init__(self, zkhandler, config, logger, this_node):
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self.zkhandler = zkhandler
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self.config = config
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self.logger = logger
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self.this_node = this_node
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# Get a list of plugins from the plugin_directory
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plugin_files = next(walk(self.config["plugin_directory"]), (None, None, []))[
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2
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] # [] if no file
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self.all_plugins = list()
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self.all_plugin_names = list()
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successful_plugins = 0
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# Load each plugin file into the all_plugins list
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for plugin_file in sorted(plugin_files):
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try:
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self.logger.out(
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f"Loading monitoring plugin from {self.config['plugin_directory']}/{plugin_file}",
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state="i",
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)
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loader = importlib.machinery.SourceFileLoader(
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"plugin_script", f"{self.config['plugin_directory']}/{plugin_file}"
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)
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spec = importlib.util.spec_from_loader(loader.name, loader)
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plugin_script = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(plugin_script)
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plugin = plugin_script.MonitoringPluginScript(
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self.zkhandler,
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self.config,
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self.logger,
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self.this_node,
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plugin_script.PLUGIN_NAME,
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)
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failed_setup = plugin.setup()
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if failed_setup is not None:
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raise PluginError(f"{failed_setup}")
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# Create plugin key
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self.zkhandler.write(
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[
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.name",
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plugin.plugin_name,
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),
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plugin.plugin_name,
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.last_run",
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plugin.plugin_name,
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),
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"0",
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.health_delta",
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plugin.plugin_name,
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),
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"0",
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.message",
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plugin.plugin_name,
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),
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"Initializing",
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.data",
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plugin.plugin_name,
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),
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dumps({}),
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),
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(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin.runtime",
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plugin.plugin_name,
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),
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"0.00",
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),
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]
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)
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self.all_plugins.append(plugin)
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self.all_plugin_names.append(plugin.plugin_name)
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successful_plugins += 1
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self.logger.out(
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f"Successfully loaded monitoring plugin '{plugin.plugin_name}'",
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state="o",
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)
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except Exception as e:
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self.logger.out(
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f"Failed to load monitoring plugin: {e}",
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state="w",
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)
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self.zkhandler.write(
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[
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(
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("node.monitoring.plugins", self.this_node.name),
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" ".join(self.all_plugin_names),
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),
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]
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)
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if successful_plugins < 1:
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return
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# Clean up any old plugin data for which a plugin file no longer exists
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plugins_data = self.zkhandler.children(
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("node.monitoring.data", self.this_node.name)
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)
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if plugins_data is not None:
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for plugin_key in plugins_data:
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if plugin_key not in self.all_plugin_names:
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self.zkhandler.delete(
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(
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"node.monitoring.data",
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self.this_node.name,
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"monitoring_plugin",
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plugin_key,
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)
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)
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self.start_check_timer()
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def __del__(self):
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self.shutdown()
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def shutdown(self):
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self.stop_check_timer()
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self.run_cleanups()
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def start_check_timer(self):
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check_interval = 60
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self.logger.out(
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f"Starting monitoring check timer ({check_interval} second interval)",
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state="s",
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)
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self.check_timer = BackgroundScheduler()
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self.check_timer.add_job(
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self.run_plugins,
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trigger="interval",
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seconds=check_interval,
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)
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self.check_timer.start()
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def stop_check_timer(self):
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try:
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self.check_timer.shutdown()
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self.logger.out("Stopping monitoring check timer", state="s")
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except Exception:
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self.logger.out("Failed to stop monitoring check timer", state="w")
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def run_plugin(self, plugin):
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time_start = datetime.now()
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try:
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result = plugin.run(coordinator_state=self.this_node.coordinator_state)
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except Exception as e:
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self.logger.out(
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f"Monitoring plugin {plugin.plugin_name} failed: {type(e).__name__}: {e}",
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state="e",
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)
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# Whatever it had, we try to return
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return plugin.plugin_result
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time_end = datetime.now()
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time_delta = time_end - time_start
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runtime = "{:0.02f}".format(time_delta.total_seconds())
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result.set_runtime(runtime)
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result.to_zookeeper()
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return result
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def run_plugins(self):
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if self.this_node.coordinator_state == "primary":
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cst_colour = self.logger.fmt_green
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elif self.this_node.coordinator_state == "secondary":
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cst_colour = self.logger.fmt_blue
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else:
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cst_colour = self.logger.fmt_cyan
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self.logger.out(
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"{}{} healthcheck @ {}{} [{}{}{}]".format(
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self.logger.fmt_purple,
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self.config["node_hostname"],
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datetime.now(),
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self.logger.fmt_end,
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self.logger.fmt_bold + cst_colour,
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self.this_node.coordinator_state,
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self.logger.fmt_end,
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),
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state="t",
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)
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runtime_start = datetime.now()
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total_health = 100
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plugin_results = list()
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with concurrent.futures.ThreadPoolExecutor(max_workers=99) as executor:
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to_future_plugin_results = {
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executor.submit(self.run_plugin, plugin): plugin
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for plugin in self.all_plugins
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}
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for future in concurrent.futures.as_completed(to_future_plugin_results):
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plugin_results.append(future.result())
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for result in sorted(plugin_results, key=lambda x: x.plugin_name):
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if (
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self.config["log_keepalives"]
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and self.config["log_keepalive_plugin_details"]
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):
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self.logger.out(
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result.message + f" [-{result.health_delta}]",
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state="t",
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prefix=f"{result.plugin_name} ({result.runtime}s)",
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)
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total_health -= result.health_delta
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if total_health < 0:
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total_health = 0
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self.zkhandler.write(
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[
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(
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("node.monitoring.health", self.this_node.name),
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total_health,
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),
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]
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)
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runtime_end = datetime.now()
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runtime_delta = runtime_end - runtime_start
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runtime = "{:0.02f}".format(runtime_delta.total_seconds())
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time.sleep(0.2)
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if isinstance(self.this_node.health, int):
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if self.this_node.health > 90:
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health_colour = self.logger.fmt_green
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elif self.this_node.health > 50:
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health_colour = self.logger.fmt_yellow
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else:
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health_colour = self.logger.fmt_red
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health_text = str(self.this_node.health) + "%"
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else:
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health_colour = self.logger.fmt_blue
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health_text = "N/A"
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self.logger.out(
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"Node health at {health_colour}{health}{nofmt}, checked in {runtime} seconds".format(
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health_colour=health_colour,
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nofmt=self.logger.fmt_end,
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health=health_text,
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runtime=runtime,
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),
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state="t",
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)
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def run_cleanup(self, plugin):
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return plugin.cleanup()
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def run_cleanups(self):
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with concurrent.futures.ThreadPoolExecutor(max_workers=99) as executor:
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to_future_plugin_results = {
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executor.submit(self.run_cleanup, plugin): plugin
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for plugin in self.all_plugins
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}
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for future in concurrent.futures.as_completed(to_future_plugin_results):
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# This doesn't do anything, just lets us wait for them all to complete
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pass
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# Set the node health to None as no previous checks are now valid
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self.zkhandler.write(
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[
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(
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("node.monitoring.health", self.this_node.name),
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None,
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),
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]
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)
|