pvc/node-daemon/pvcnoded/objects/NetstatsInstance.py

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#!/usr/bin/env python3
# NetstatsInstance.py - Class implementing a PVC network stats gatherer and run by pvcnoded
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2024 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/>.
#
###############################################################################
from apscheduler.schedulers.background import BackgroundScheduler
from collections import deque
from json import dumps
from os import walk
from os.path import exists
class NetstatsIfaceInstance(object):
"""
NetstatsIfaceInstance
This class implements a rolling statistics poller for a network interface,
collecting stats on the bits and packets per second in both directions every
second.
Via the get_stats() function, it returns the rolling average of all 4 values,
as well as totals, over the last 5 seconds (self.avg_samples) as a tuple of:
(rx_bps, rx_pps, tx_bps, tx_pps, total_bps, total_pps, link_speed, state)
"""
def __init__(self, logger, iface, avg_samples):
"""
Initialize the class instance, creating our BackgroundScheduler, setting
the average sample rate, and creating the deques and average values.
"""
self.logger = logger
self.iface = iface
self.data_valid = False
self.data_polls = 0
self.timer = BackgroundScheduler()
self.timer.add_job(self.gather_stats, trigger="interval", seconds=1)
self.avg_samples = avg_samples
self.link_speed = 0
self.state = "down"
self.rx_bits_rolling = deque(list(), self.avg_samples + 1)
self.rx_bps = 0
self.rx_packets_rolling = deque(list(), self.avg_samples + 1)
self.rx_pps = 0
self.tx_bits_rolling = deque(list(), self.avg_samples + 1)
self.tx_bps = 0
self.tx_packets_rolling = deque(list(), self.avg_samples + 1)
self.tx_pps = 0
self.total_bps = 0
self.total_pps = 0
def get_iface_stats(self):
"""
Reads the interface statistics from the sysfs for the interface.
"""
iface_state_path = f"/sys/class/net/{self.iface}/operstate"
with open(iface_state_path) as stfh:
self.state = stfh.read().strip()
iface_speed_path = f"/sys/class/net/{self.iface}/speed"
try:
with open(iface_speed_path) as spfh:
# The speed key is always in Mbps so multiply by 1000*1000 to get bps
self.link_speed = int(spfh.read()) * 1000 * 1000
except OSError:
self.link_speed = 0
iface_stats_path = f"/sys/class/net/{self.iface}/statistics"
with open(f"{iface_stats_path}/rx_bytes") as rxbfh:
self.rx_bits_rolling.append(int(rxbfh.read()) * 8)
with open(f"{iface_stats_path}/tx_bytes") as txbfh:
self.tx_bits_rolling.append(int(txbfh.read()) * 8)
with open(f"{iface_stats_path}/rx_packets") as rxpfh:
self.rx_packets_rolling.append(int(rxpfh.read()) * 8)
with open(f"{iface_stats_path}/tx_packets") as txpfh:
self.tx_packets_rolling.append(int(txpfh.read()) * 8)
def calculate_averages(self):
"""
Calculates the bps/pps values from the rolling values.
"""
rx_bits_diffs = list()
for sample_idx in range(self.avg_samples, 0, -1):
rx_bits_diffs.append(
self.rx_bits_rolling[sample_idx] - self.rx_bits_rolling[sample_idx - 1]
)
self.rx_bps = int(sum(rx_bits_diffs) / self.avg_samples)
rx_packets_diffs = list()
for sample_idx in range(self.avg_samples, 0, -1):
rx_packets_diffs.append(
self.rx_packets_rolling[sample_idx]
- self.rx_packets_rolling[sample_idx - 1]
)
self.rx_pps = int(sum(rx_packets_diffs) / self.avg_samples)
tx_bits_diffs = list()
for sample_idx in range(self.avg_samples, 0, -1):
tx_bits_diffs.append(
self.tx_bits_rolling[sample_idx] - self.tx_bits_rolling[sample_idx - 1]
)
self.tx_bps = int(sum(tx_bits_diffs) / self.avg_samples)
tx_packets_diffs = list()
for sample_idx in range(self.avg_samples, 0, -1):
tx_packets_diffs.append(
self.tx_packets_rolling[sample_idx]
- self.tx_packets_rolling[sample_idx - 1]
)
self.tx_pps = int(sum(tx_packets_diffs) / self.avg_samples)
self.total_bps = self.rx_bps + self.tx_bps
self.total_pps = self.rx_pps + self.tx_pps
def gather_stats(self):
"""
Gathers the current stats and then calculates the averages.
Runs via the BackgroundScheduler timer every 1 second.
"""
self.get_iface_stats()
if self.data_valid:
self.calculate_averages()
# Handle data validity: our data is invalid until we hit enough polls
# to make a valid average (avg_samples plus 1).
if not self.data_valid:
self.data_polls += 1
if self.data_polls > self.avg_samples:
self.data_valid = True
def start(self):
"""
Starts the timer.
"""
self.timer.start()
def stop(self):
"""
Stops the timer.
"""
self.timer.shutdown()
def get_stats(self):
"""
Returns a tuple of the current statistics.
"""
if not self.data_valid:
return None
return (
self.rx_bps,
self.rx_pps,
self.tx_bps,
self.tx_pps,
self.total_bps,
self.total_pps,
self.link_speed,
self.state,
)
class NetstatsInstance(object):
"""
NetstatsInstance
This class implements a rolling statistics poller for all PHYSICAL network interfaces,
on the system, initializing a NetstatsIfaceInstance for each, as well as handling
value updates into Zookeeper.
"""
def __init__(self, logger, config, zkhandler, this_node):
"""
Initialize the class instance.
"""
self.logger = logger
self.config = config
self.zkhandler = zkhandler
self.node_name = this_node.name
self.interfaces = dict()
self.logger.out(
f"Starting netstats collector ({self.config['keepalive_interval']} second interval)",
state="s",
)
self.set_interfaces()
def shutdown(self):
"""
Stop all pollers and delete the NetstatsIfaceInstance objects
"""
# Empty the network stats object
self.zkhandler.write([(("node.network.stats", self.node_name), dumps({}))])
for iface in self.interfaces.keys():
self.interfaces[iface].stop()
def set_interfaces(self):
"""
Sets the list of interfaces on the system, and then ensures that each
interface has a NetstatsIfaceInstance assigned to it and polling.
"""
# Get a list of all active interfaces
net_root_path = "/sys/class/net"
all_ifaces = list()
for (_, dirnames, _) in walk(net_root_path):
all_ifaces.extend(dirnames)
all_ifaces.sort()
self.logger.out(
f"Parsing network list: {all_ifaces}", state="d", prefix="netstats-thread"
)
# Add any missing interfaces
for iface in all_ifaces:
if not exists(f"{net_root_path}/{iface}/device"):
# This is not a physical interface; skip it
continue
if iface not in self.interfaces.keys():
# Set the number of samples to be equal to the keepalive interval, so that each
# keepalive has a fresh set of data from the last keepalive_interval seconds.
self.interfaces[iface] = NetstatsIfaceInstance(
self.logger, iface, self.config["keepalive_interval"]
)
self.interfaces[iface].start()
# Remove any superfluous interfaces
for iface in self.interfaces.keys():
if iface not in all_ifaces:
self.interfaces[iface].stop()
del self.interfaces[iface]
def set_data(self):
data = dict()
for iface in self.interfaces.keys():
self.logger.out(
f"Getting data for interface {iface}",
state="d",
prefix="netstats-thread",
)
iface_stats = self.interfaces[iface].get_stats()
if iface_stats is None:
continue
(
iface_rx_bps,
iface_rx_pps,
iface_tx_bps,
iface_tx_pps,
iface_total_bps,
iface_total_pps,
iface_link_speed,
iface_state,
) = iface_stats
data[iface] = {
"rx_bps": iface_rx_bps,
"rx_pps": iface_rx_pps,
"tx_bps": iface_tx_bps,
"tx_pps": iface_tx_pps,
"total_bps": iface_total_bps,
"total_pps": iface_total_pps,
"link_speed": iface_link_speed,
"state": iface_state,
}
self.zkhandler.write([(("node.network.stats", self.node_name), dumps(data))])