868 lines
25 KiB
Python
868 lines
25 KiB
Python
#!/usr/bin/env python3
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# common.py - PVC client function library, common fuctions
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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 time
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import uuid
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import lxml
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import subprocess
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import signal
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from json import loads
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from re import match as re_match
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from re import split as re_split
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from distutils.util import strtobool
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from threading import Thread
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from shlex import split as shlex_split
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from functools import wraps
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###############################################################################
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# Performance Profiler decorator
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###############################################################################
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# Get performance statistics on a function or class
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class Profiler(object):
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def __init__(self, config):
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self.is_debug = config["debug"]
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self.pvc_logdir = "/var/log/pvc"
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def __call__(self, function):
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if not callable(function):
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return
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if not self.is_debug:
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return function
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@wraps(function)
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def profiler_wrapper(*args, **kwargs):
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import cProfile
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import pstats
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from os import path, makedirs
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from datetime import datetime
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if not path.exists(self.pvc_logdir):
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print(
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"Profiler: Requested profiling of {} but no log dir present; printing instead.".format(
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str(function.__name__)
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)
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)
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log_result = False
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else:
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log_result = True
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profiler_logdir = "{}/profiler".format(self.pvc_logdir)
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if not path.exists(profiler_logdir):
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makedirs(profiler_logdir)
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pr = cProfile.Profile()
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pr.enable()
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ret = function(*args, **kwargs)
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pr.disable()
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stats = pstats.Stats(pr)
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stats.sort_stats(pstats.SortKey.TIME)
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if log_result:
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stats.dump_stats(
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filename="{}/{}_{}.log".format(
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profiler_logdir,
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str(function.__name__),
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str(datetime.now()).replace(" ", "_"),
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)
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)
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else:
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print(
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"Profiler stats for function {} at {}:".format(
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str(function.__name__), str(datetime.now())
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)
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)
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stats.print_stats()
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return ret
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return profiler_wrapper
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###############################################################################
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# Supplemental functions
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###############################################################################
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#
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# Run a local OS daemon in the background
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#
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class OSDaemon(object):
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def __init__(self, command_string, environment, logfile):
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command = shlex_split(command_string)
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# Set stdout to be a logfile if set
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if logfile:
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stdout = open(logfile, "a")
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else:
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stdout = subprocess.PIPE
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# Invoke the process
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self.proc = subprocess.Popen(
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command,
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env=environment,
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stdout=stdout,
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stderr=stdout,
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)
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# Signal the process
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def signal(self, sent_signal):
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signal_map = {
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"hup": signal.SIGHUP,
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"int": signal.SIGINT,
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"term": signal.SIGTERM,
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"kill": signal.SIGKILL,
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}
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self.proc.send_signal(signal_map[sent_signal])
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def run_os_daemon(command_string, environment=None, logfile=None):
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daemon = OSDaemon(command_string, environment, logfile)
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return daemon
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#
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# Run a local OS command via shell
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#
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def run_os_command(command_string, background=False, environment=None, timeout=None):
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command = shlex_split(command_string)
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if background:
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def runcmd():
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try:
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subprocess.run(
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command,
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env=environment,
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timeout=timeout,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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except subprocess.TimeoutExpired:
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pass
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thread = Thread(target=runcmd, args=())
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thread.start()
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return 0, None, None
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else:
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try:
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command_output = subprocess.run(
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command,
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env=environment,
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timeout=timeout,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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retcode = command_output.returncode
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except subprocess.TimeoutExpired:
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retcode = 128
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except Exception:
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retcode = 255
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try:
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stdout = command_output.stdout.decode("ascii")
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except Exception:
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stdout = ""
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try:
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stderr = command_output.stderr.decode("ascii")
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except Exception:
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stderr = ""
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return retcode, stdout, stderr
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#
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# Validate a UUID
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#
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def validateUUID(dom_uuid):
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try:
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uuid.UUID(dom_uuid)
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return True
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except Exception:
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return False
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#
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# Parse a Domain XML object
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#
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def getDomainXML(zkhandler, dom_uuid):
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try:
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xml = zkhandler.read(("domain.xml", dom_uuid))
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except Exception:
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return None
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# Parse XML using lxml.objectify
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parsed_xml = lxml.objectify.fromstring(xml)
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return parsed_xml
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#
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# Get the main details for a VM object from XML
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#
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def getDomainMainDetails(parsed_xml):
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# Get the information we want from it
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duuid = str(parsed_xml.uuid)
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try:
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ddescription = str(parsed_xml.description)
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except AttributeError:
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ddescription = "N/A"
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dname = str(parsed_xml.name)
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dmemory = str(parsed_xml.memory)
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dmemory_unit = str(parsed_xml.memory.attrib.get("unit"))
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if dmemory_unit == "KiB":
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dmemory = int(int(dmemory) / 1024)
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elif dmemory_unit == "GiB":
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dmemory = int(int(dmemory) * 1024)
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dvcpu = str(parsed_xml.vcpu)
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try:
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dvcputopo = "{}/{}/{}".format(
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parsed_xml.cpu.topology.attrib.get("sockets"),
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parsed_xml.cpu.topology.attrib.get("cores"),
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parsed_xml.cpu.topology.attrib.get("threads"),
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)
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except Exception:
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dvcputopo = "N/A"
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return duuid, dname, ddescription, dmemory, dvcpu, dvcputopo
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#
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# Get long-format details
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#
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def getDomainExtraDetails(parsed_xml):
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dtype = str(parsed_xml.os.type)
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darch = str(parsed_xml.os.type.attrib["arch"])
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dmachine = str(parsed_xml.os.type.attrib["machine"])
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dconsole = str(parsed_xml.devices.console.attrib["type"])
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demulator = str(parsed_xml.devices.emulator)
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return dtype, darch, dmachine, dconsole, demulator
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#
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# Get CPU features
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#
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def getDomainCPUFeatures(parsed_xml):
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dfeatures = []
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try:
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for feature in parsed_xml.features.getchildren():
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dfeatures.append(feature.tag)
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except Exception:
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pass
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return dfeatures
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#
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# Get disk devices
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#
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def getDomainDisks(parsed_xml, stats_data):
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ddisks = []
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for device in parsed_xml.devices.getchildren():
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if device.tag == "disk":
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disk_attrib = device.source.attrib
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disk_target = device.target.attrib
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disk_type = device.attrib.get("type")
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disk_stats_list = [
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x
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for x in stats_data.get("disk_stats", [])
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if x.get("name") == disk_attrib.get("name")
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]
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try:
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disk_stats = disk_stats_list[0]
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except Exception:
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disk_stats = {}
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if disk_type == "network":
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disk_obj = {
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"type": disk_attrib.get("protocol"),
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"name": disk_attrib.get("name"),
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"dev": disk_target.get("dev"),
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"bus": disk_target.get("bus"),
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"rd_req": disk_stats.get("rd_req", 0),
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"rd_bytes": disk_stats.get("rd_bytes", 0),
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"wr_req": disk_stats.get("wr_req", 0),
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"wr_bytes": disk_stats.get("wr_bytes", 0),
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}
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elif disk_type == "file":
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disk_obj = {
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"type": "file",
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"name": disk_attrib.get("file"),
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"dev": disk_target.get("dev"),
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"bus": disk_target.get("bus"),
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"rd_req": disk_stats.get("rd_req", 0),
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"rd_bytes": disk_stats.get("rd_bytes", 0),
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"wr_req": disk_stats.get("wr_req", 0),
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"wr_bytes": disk_stats.get("wr_bytes", 0),
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}
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else:
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disk_obj = {}
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ddisks.append(disk_obj)
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return ddisks
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#
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# Get a list of disk devices
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#
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def getDomainDiskList(zkhandler, dom_uuid):
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domain_information = getInformationFromXML(zkhandler, dom_uuid)
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disk_list = []
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for disk in domain_information["disks"]:
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disk_list.append(disk["name"])
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return disk_list
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#
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# Get a list of domain tags
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#
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def getDomainTags(zkhandler, dom_uuid):
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"""
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Get a list of tags for domain dom_uuid
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The UUID must be validated before calling this function!
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"""
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tags = list()
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for tag in zkhandler.children(("domain.meta.tags", dom_uuid)):
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tag_type = zkhandler.read(("domain.meta.tags", dom_uuid, "tag.type", tag))
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protected = bool(
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strtobool(
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zkhandler.read(("domain.meta.tags", dom_uuid, "tag.protected", tag))
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)
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)
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tags.append({"name": tag, "type": tag_type, "protected": protected})
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return tags
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#
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# Get a set of domain metadata
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#
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def getDomainMetadata(zkhandler, dom_uuid):
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"""
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Get the domain metadata for domain dom_uuid
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The UUID must be validated before calling this function!
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"""
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domain_node_limit = zkhandler.read(("domain.meta.node_limit", dom_uuid))
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domain_node_selector = zkhandler.read(("domain.meta.node_selector", dom_uuid))
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domain_node_autostart = zkhandler.read(("domain.meta.autostart", dom_uuid))
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domain_migration_method = zkhandler.read(("domain.meta.migrate_method", dom_uuid))
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if not domain_node_limit:
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domain_node_limit = None
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else:
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domain_node_limit = domain_node_limit.split(",")
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if not domain_node_autostart:
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domain_node_autostart = None
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return (
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domain_node_limit,
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domain_node_selector,
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domain_node_autostart,
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domain_migration_method,
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)
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#
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# Get domain information from XML
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#
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def getInformationFromXML(zkhandler, uuid):
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"""
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Gather information about a VM from the Libvirt XML configuration in the Zookeper database
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and return a dict() containing it.
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"""
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domain_state = zkhandler.read(("domain.state", uuid))
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domain_node = zkhandler.read(("domain.node", uuid))
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domain_lastnode = zkhandler.read(("domain.last_node", uuid))
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domain_failedreason = zkhandler.read(("domain.failed_reason", uuid))
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(
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domain_node_limit,
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domain_node_selector,
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domain_node_autostart,
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domain_migration_method,
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) = getDomainMetadata(zkhandler, uuid)
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domain_tags = getDomainTags(zkhandler, uuid)
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domain_profile = zkhandler.read(("domain.profile", uuid))
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domain_vnc = zkhandler.read(("domain.console.vnc", uuid))
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if domain_vnc:
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domain_vnc_listen, domain_vnc_port = domain_vnc.split(":")
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else:
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domain_vnc_listen = "None"
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domain_vnc_port = "None"
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parsed_xml = getDomainXML(zkhandler, uuid)
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stats_data = zkhandler.read(("domain.stats", uuid))
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if stats_data is not None:
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try:
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stats_data = loads(stats_data)
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except Exception:
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stats_data = {}
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else:
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stats_data = {}
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(
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domain_uuid,
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domain_name,
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domain_description,
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domain_memory,
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domain_vcpu,
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domain_vcputopo,
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) = getDomainMainDetails(parsed_xml)
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domain_networks = getDomainNetworks(parsed_xml, stats_data)
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(
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domain_type,
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domain_arch,
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domain_machine,
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domain_console,
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domain_emulator,
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) = getDomainExtraDetails(parsed_xml)
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domain_features = getDomainCPUFeatures(parsed_xml)
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domain_disks = getDomainDisks(parsed_xml, stats_data)
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domain_controllers = getDomainControllers(parsed_xml)
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if domain_lastnode:
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domain_migrated = "from {}".format(domain_lastnode)
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else:
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domain_migrated = "no"
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domain_information = {
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"name": domain_name,
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"uuid": domain_uuid,
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"state": domain_state,
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"node": domain_node,
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"last_node": domain_lastnode,
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"migrated": domain_migrated,
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"failed_reason": domain_failedreason,
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"node_limit": domain_node_limit,
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"node_selector": domain_node_selector,
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"node_autostart": bool(strtobool(domain_node_autostart)),
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"migration_method": domain_migration_method,
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"tags": domain_tags,
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"description": domain_description,
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"profile": domain_profile,
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"memory": int(domain_memory),
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"memory_stats": stats_data.get("mem_stats", {}),
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"vcpu": int(domain_vcpu),
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"vcpu_topology": domain_vcputopo,
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"vcpu_stats": stats_data.get("cpu_stats", {}),
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"networks": domain_networks,
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"type": domain_type,
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"arch": domain_arch,
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"machine": domain_machine,
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"console": domain_console,
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"vnc": {"listen": domain_vnc_listen, "port": domain_vnc_port},
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"emulator": domain_emulator,
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"features": domain_features,
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"disks": domain_disks,
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"controllers": domain_controllers,
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"xml": lxml.etree.tostring(parsed_xml, encoding="ascii", method="xml")
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.decode()
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.replace('"', "'"),
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}
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return domain_information
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#
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# Get network devices
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#
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def getDomainNetworks(parsed_xml, stats_data):
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dnets = []
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for device in parsed_xml.devices.getchildren():
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if device.tag == "interface":
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try:
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net_type = device.attrib.get("type")
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except Exception:
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net_type = None
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try:
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net_mac = device.mac.attrib.get("address")
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except Exception:
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net_mac = None
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try:
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net_bridge = device.source.attrib.get(net_type)
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except Exception:
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net_bridge = None
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try:
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net_model = device.model.attrib.get("type")
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except Exception:
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net_model = None
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try:
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net_stats_list = [
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x
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for x in stats_data.get("net_stats", [])
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if x.get("bridge") == net_bridge
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]
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net_stats = net_stats_list[0]
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except Exception:
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net_stats = {}
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net_rd_bytes = net_stats.get("rd_bytes", 0)
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net_rd_packets = net_stats.get("rd_packets", 0)
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net_rd_errors = net_stats.get("rd_errors", 0)
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net_rd_drops = net_stats.get("rd_drops", 0)
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net_wr_bytes = net_stats.get("wr_bytes", 0)
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net_wr_packets = net_stats.get("wr_packets", 0)
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net_wr_errors = net_stats.get("wr_errors", 0)
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net_wr_drops = net_stats.get("wr_drops", 0)
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if net_type == "direct":
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net_vni = "macvtap:" + device.source.attrib.get("dev")
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net_bridge = device.source.attrib.get("dev")
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elif net_type == "hostdev":
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net_vni = "hostdev:" + str(device.sriov_device)
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net_bridge = str(device.sriov_device)
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else:
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net_vni = re_match(r"[vm]*br([0-9a-z]+)", net_bridge).group(1)
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net_obj = {
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"type": net_type,
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"vni": net_vni,
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"mac": net_mac,
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"source": net_bridge,
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"model": net_model,
|
|
"rd_bytes": net_rd_bytes,
|
|
"rd_packets": net_rd_packets,
|
|
"rd_errors": net_rd_errors,
|
|
"rd_drops": net_rd_drops,
|
|
"wr_bytes": net_wr_bytes,
|
|
"wr_packets": net_wr_packets,
|
|
"wr_errors": net_wr_errors,
|
|
"wr_drops": net_wr_drops,
|
|
}
|
|
dnets.append(net_obj)
|
|
|
|
return dnets
|
|
|
|
|
|
#
|
|
# Get controller devices
|
|
#
|
|
def getDomainControllers(parsed_xml):
|
|
dcontrollers = []
|
|
for device in parsed_xml.devices.getchildren():
|
|
if device.tag == "controller":
|
|
controller_type = device.attrib.get("type")
|
|
try:
|
|
controller_model = device.attrib.get("model")
|
|
except KeyError:
|
|
controller_model = "none"
|
|
controller_obj = {"type": controller_type, "model": controller_model}
|
|
dcontrollers.append(controller_obj)
|
|
|
|
return dcontrollers
|
|
|
|
|
|
#
|
|
# Verify node is valid in cluster
|
|
#
|
|
def verifyNode(zkhandler, node):
|
|
return zkhandler.exists(("node", node))
|
|
|
|
|
|
#
|
|
# Get the primary coordinator node
|
|
#
|
|
def getPrimaryNode(zkhandler):
|
|
failcount = 0
|
|
while True:
|
|
try:
|
|
primary_node = zkhandler.read("base.config.primary_node")
|
|
except Exception:
|
|
primary_node == "none"
|
|
|
|
if primary_node == "none":
|
|
raise
|
|
time.sleep(1)
|
|
failcount += 1
|
|
continue
|
|
else:
|
|
break
|
|
|
|
if failcount > 2:
|
|
return None
|
|
|
|
return primary_node
|
|
|
|
|
|
#
|
|
# Find a migration target
|
|
#
|
|
def findTargetNode(zkhandler, dom_uuid):
|
|
# Determine VM node limits; set config value if read fails
|
|
try:
|
|
node_limit = zkhandler.read(("domain.meta.node_limit", dom_uuid)).split(",")
|
|
if not any(node_limit):
|
|
node_limit = None
|
|
except Exception:
|
|
node_limit = None
|
|
|
|
# Determine VM search field or use default; set config value if read fails
|
|
try:
|
|
search_field = zkhandler.read(("domain.meta.node_selector", dom_uuid))
|
|
except Exception:
|
|
search_field = None
|
|
|
|
# If our search field is invalid, use the default
|
|
if search_field is None or search_field in ["None", "none"]:
|
|
search_field = zkhandler.read("base.config.migration_target_selector")
|
|
|
|
# Execute the search
|
|
if search_field == "mem":
|
|
return findTargetNodeMemFree(zkhandler, node_limit, dom_uuid)
|
|
if search_field == "memprov":
|
|
return findTargetNodeMemProv(zkhandler, node_limit, dom_uuid)
|
|
if search_field == "load":
|
|
return findTargetNodeLoad(zkhandler, node_limit, dom_uuid)
|
|
if search_field == "vcpus":
|
|
return findTargetNodeVCPUs(zkhandler, node_limit, dom_uuid)
|
|
if search_field == "vms":
|
|
return findTargetNodeVMs(zkhandler, node_limit, dom_uuid)
|
|
|
|
# Nothing was found
|
|
return None
|
|
|
|
|
|
#
|
|
# Get the list of valid target nodes
|
|
#
|
|
def getNodes(zkhandler, node_limit, dom_uuid):
|
|
valid_node_list = []
|
|
full_node_list = zkhandler.children("base.node")
|
|
current_node = zkhandler.read(("domain.node", dom_uuid))
|
|
|
|
for node in full_node_list:
|
|
if node_limit and node not in node_limit:
|
|
continue
|
|
|
|
daemon_state = zkhandler.read(("node.state.daemon", node))
|
|
domain_state = zkhandler.read(("node.state.domain", node))
|
|
|
|
if node == current_node:
|
|
continue
|
|
|
|
if daemon_state != "run" or domain_state != "ready":
|
|
continue
|
|
|
|
valid_node_list.append(node)
|
|
|
|
return valid_node_list
|
|
|
|
|
|
#
|
|
# via free memory
|
|
#
|
|
def findTargetNodeMemFree(zkhandler, node_limit, dom_uuid):
|
|
most_memfree = 0
|
|
target_node = None
|
|
|
|
node_list = getNodes(zkhandler, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
memfree = int(zkhandler.read(("node.memory.free", node)))
|
|
|
|
if memfree > most_memfree:
|
|
most_memfree = memfree
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
|
|
#
|
|
# via provisioned memory
|
|
#
|
|
def findTargetNodeMemProv(zkhandler, node_limit, dom_uuid):
|
|
most_provfree = 0
|
|
target_node = None
|
|
|
|
node_list = getNodes(zkhandler, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
memprov = int(zkhandler.read(("node.memory.provisioned", node)))
|
|
memused = int(zkhandler.read(("node.memory.used", node)))
|
|
memfree = int(zkhandler.read(("node.memory.free", node)))
|
|
memtotal = memused + memfree
|
|
provfree = memtotal - memprov
|
|
|
|
if provfree > most_provfree:
|
|
most_provfree = provfree
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
|
|
#
|
|
# via load average
|
|
#
|
|
def findTargetNodeLoad(zkhandler, node_limit, dom_uuid):
|
|
least_load = 9999.0
|
|
target_node = None
|
|
|
|
node_list = getNodes(zkhandler, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
load = float(zkhandler.read(("node.cpu.load", node)))
|
|
|
|
if load < least_load:
|
|
least_load = load
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
|
|
#
|
|
# via total vCPUs
|
|
#
|
|
def findTargetNodeVCPUs(zkhandler, node_limit, dom_uuid):
|
|
least_vcpus = 9999
|
|
target_node = None
|
|
|
|
node_list = getNodes(zkhandler, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
vcpus = int(zkhandler.read(("node.vcpu.allocated", node)))
|
|
|
|
if vcpus < least_vcpus:
|
|
least_vcpus = vcpus
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
|
|
#
|
|
# via total VMs
|
|
#
|
|
def findTargetNodeVMs(zkhandler, node_limit, dom_uuid):
|
|
least_vms = 9999
|
|
target_node = None
|
|
|
|
node_list = getNodes(zkhandler, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
vms = int(zkhandler.read(("node.count.provisioned_domains", node)))
|
|
|
|
if vms < least_vms:
|
|
least_vms = vms
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
|
|
#
|
|
# Connect to the primary node and run a command
|
|
#
|
|
def runRemoteCommand(node, command, become=False):
|
|
import paramiko
|
|
import hashlib
|
|
import dns.resolver
|
|
import dns.flags
|
|
|
|
# Support doing SSHFP checks
|
|
class DnssecPolicy(paramiko.client.MissingHostKeyPolicy):
|
|
def missing_host_key(self, client, hostname, key):
|
|
sshfp_expect = hashlib.sha1(key.asbytes()).hexdigest()
|
|
ans = dns.resolver.query(hostname, "SSHFP")
|
|
if not ans.response.flags & dns.flags.DO:
|
|
raise AssertionError("Answer is not DNSSEC signed")
|
|
for answer in ans.response.answer:
|
|
for item in answer.items:
|
|
if sshfp_expect in item.to_text():
|
|
client._log(
|
|
paramiko.common.DEBUG,
|
|
"Found {} in SSHFP for host {}".format(
|
|
key.get_name(), hostname
|
|
),
|
|
)
|
|
return
|
|
raise AssertionError("SSHFP not published in DNS")
|
|
|
|
if become:
|
|
command = "sudo " + command
|
|
|
|
ssh_client = paramiko.client.SSHClient()
|
|
ssh_client.load_system_host_keys()
|
|
ssh_client.set_missing_host_key_policy(DnssecPolicy())
|
|
ssh_client.connect(node)
|
|
stdin, stdout, stderr = ssh_client.exec_command(command)
|
|
return (
|
|
stdout.read().decode("ascii").rstrip(),
|
|
stderr.read().decode("ascii").rstrip(),
|
|
)
|
|
|
|
|
|
#
|
|
# Reload the firewall rules of the system
|
|
#
|
|
def reload_firewall_rules(rules_file, logger=None):
|
|
if logger is not None:
|
|
logger.out("Reloading firewall configuration", state="o")
|
|
|
|
retcode, stdout, stderr = run_os_command("/usr/sbin/nft -f {}".format(rules_file))
|
|
if retcode != 0 and logger is not None:
|
|
logger.out("Failed to reload configuration: {}".format(stderr), state="e")
|
|
|
|
|
|
#
|
|
# Create an IP address
|
|
#
|
|
def createIPAddress(ipaddr, cidrnetmask, dev):
|
|
run_os_command("ip address add {}/{} dev {}".format(ipaddr, cidrnetmask, dev))
|
|
run_os_command(
|
|
"arping -P -U -W 0.02 -c 2 -i {dev} -S {ip} {ip}".format(dev=dev, ip=ipaddr)
|
|
)
|
|
|
|
|
|
#
|
|
# Remove an IP address
|
|
#
|
|
def removeIPAddress(ipaddr, cidrnetmask, dev):
|
|
run_os_command("ip address delete {}/{} dev {}".format(ipaddr, cidrnetmask, dev))
|
|
|
|
|
|
#
|
|
# Sort a set of interface names (e.g. ens1f1v10)
|
|
#
|
|
def sortInterfaceNames(interface_names):
|
|
# We can't handle non-list inputs
|
|
if not isinstance(interface_names, list):
|
|
return interface_names
|
|
|
|
def atoi(text):
|
|
return int(text) if text.isdigit() else text
|
|
|
|
def natural_keys(text):
|
|
"""
|
|
alist.sort(key=natural_keys) sorts in human order
|
|
http://nedbatchelder.com/blog/200712/human_sorting.html
|
|
(See Toothy's implementation in the comments)
|
|
"""
|
|
return [atoi(c) for c in re_split(r"(\d+)", text)]
|
|
|
|
return sorted(interface_names, key=natural_keys)
|