pvc/health-daemon/pvchealthd/objects/MonitoringInstance.py

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