775 lines
23 KiB
Python
775 lines
23 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) 2018-2021 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('Profiler: Requested profiling of {} but no log dir present; printing instead.'.format(str(function.__name__)))
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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(filename='{}/{}_{}.log'.format(profiler_logdir, str(function.__name__), str(datetime.now()).replace(' ', '_')))
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else:
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print('Profiler stats for function {} at {}:'.format(str(function.__name__), str(datetime.now())))
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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(parsed_xml.cpu.topology.attrib.get('sockets'), parsed_xml.cpu.topology.attrib.get('cores'), parsed_xml.cpu.topology.attrib.get('threads'))
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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 = [x for x in stats_data.get('disk_stats', []) if x.get('name') == disk_attrib.get('name')]
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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 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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try:
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domain_node_limit = zkhandler.read(('domain.meta.node_limit', uuid))
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except Exception:
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domain_node_limit = None
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try:
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domain_node_selector = zkhandler.read(('domain.meta.node_selector', uuid))
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except Exception:
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domain_node_selector = None
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try:
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domain_node_autostart = zkhandler.read(('domain.meta.autostart', uuid))
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except Exception:
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domain_node_autostart = None
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try:
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domain_migration_method = zkhandler.read(('domain.meta.migrate_method', uuid))
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except Exception:
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domain_migration_method = None
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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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try:
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domain_profile = zkhandler.read(('domain.profile', uuid))
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except Exception:
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domain_profile = None
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try:
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domain_vnc = zkhandler.read(('domain.console.vnc', uuid))
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domain_vnc_listen, domain_vnc_port = domain_vnc.split(':')
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except Exception:
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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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try:
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stats_data = loads(zkhandler.read(('domain.stats', uuid)))
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except Exception:
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stats_data = {}
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domain_uuid, domain_name, domain_description, domain_memory, domain_vcpu, domain_vcputopo = getDomainMainDetails(parsed_xml)
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domain_networks = getDomainNetworks(parsed_xml, stats_data)
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domain_type, domain_arch, domain_machine, domain_console, domain_emulator = 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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'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': {
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'listen': domain_vnc_listen,
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'port': domain_vnc_port
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},
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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').decode().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 = [x for x in stats_data.get('net_stats', []) if x.get('bridge') == net_bridge]
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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,
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'rd_bytes': net_rd_bytes,
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'rd_packets': net_rd_packets,
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'rd_errors': net_rd_errors,
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'rd_drops': net_rd_drops,
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'wr_bytes': net_wr_bytes,
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'wr_packets': net_wr_packets,
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'wr_errors': net_wr_errors,
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'wr_drops': net_wr_drops
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}
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dnets.append(net_obj)
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return dnets
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#
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# Get controller devices
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#
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def getDomainControllers(parsed_xml):
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dcontrollers = []
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for device in parsed_xml.devices.getchildren():
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if device.tag == 'controller':
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controller_type = device.attrib.get('type')
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try:
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controller_model = device.attrib.get('model')
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except KeyError:
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controller_model = 'none'
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controller_obj = {'type': controller_type, 'model': controller_model}
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dcontrollers.append(controller_obj)
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return dcontrollers
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#
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# Verify node is valid in cluster
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#
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def verifyNode(zkhandler, node):
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return zkhandler.exists(('node', node))
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#
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# Get the primary coordinator node
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#
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def getPrimaryNode(zkhandler):
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failcount = 0
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while True:
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try:
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primary_node = zkhandler.read('base.config.primary_node')
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except Exception:
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primary_node == 'none'
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if primary_node == 'none':
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raise
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time.sleep(1)
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failcount += 1
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continue
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else:
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break
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if failcount > 2:
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return None
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return primary_node
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#
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# Find a migration target
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#
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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 == 'None':
|
|
search_field = zkhandler.read('base.config.migration_target_selector')
|
|
|
|
# Execute the search
|
|
if search_field == 'mem':
|
|
return findTargetNodeMem(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 (relative to allocated memory)
|
|
#
|
|
def findTargetNodeMem(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)
|