pvc/daemon-common/common.py

775 lines
23 KiB
Python

#!/usr/bin/env python3
# common.py - PVC client function library, common fuctions
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2021 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import time
import uuid
import lxml
import subprocess
import signal
from json import loads
from re import match as re_match
from re import split as re_split
from distutils.util import strtobool
from threading import Thread
from shlex import split as shlex_split
from functools import wraps
###############################################################################
# Performance Profiler decorator
###############################################################################
# Get performance statistics on a function or class
class Profiler(object):
def __init__(self, config):
self.is_debug = config['debug']
self.pvc_logdir = '/var/log/pvc'
def __call__(self, function):
if not callable(function):
return
if not self.is_debug:
return function
@wraps(function)
def profiler_wrapper(*args, **kwargs):
import cProfile
import pstats
from os import path, makedirs
from datetime import datetime
if not path.exists(self.pvc_logdir):
print('Profiler: Requested profiling of {} but no log dir present; printing instead.'.format(str(function.__name__)))
log_result = False
else:
log_result = True
profiler_logdir = '{}/profiler'.format(self.pvc_logdir)
if not path.exists(profiler_logdir):
makedirs(profiler_logdir)
pr = cProfile.Profile()
pr.enable()
ret = function(*args, **kwargs)
pr.disable()
stats = pstats.Stats(pr)
stats.sort_stats(pstats.SortKey.TIME)
if log_result:
stats.dump_stats(filename='{}/{}_{}.log'.format(profiler_logdir, str(function.__name__), str(datetime.now()).replace(' ', '_')))
else:
print('Profiler stats for function {} at {}:'.format(str(function.__name__), str(datetime.now())))
stats.print_stats()
return ret
return profiler_wrapper
###############################################################################
# Supplemental functions
###############################################################################
#
# Run a local OS daemon in the background
#
class OSDaemon(object):
def __init__(self, command_string, environment, logfile):
command = shlex_split(command_string)
# Set stdout to be a logfile if set
if logfile:
stdout = open(logfile, 'a')
else:
stdout = subprocess.PIPE
# Invoke the process
self.proc = subprocess.Popen(
command,
env=environment,
stdout=stdout,
stderr=stdout,
)
# Signal the process
def signal(self, sent_signal):
signal_map = {
'hup': signal.SIGHUP,
'int': signal.SIGINT,
'term': signal.SIGTERM,
'kill': signal.SIGKILL
}
self.proc.send_signal(signal_map[sent_signal])
def run_os_daemon(command_string, environment=None, logfile=None):
daemon = OSDaemon(command_string, environment, logfile)
return daemon
#
# Run a local OS command via shell
#
def run_os_command(command_string, background=False, environment=None, timeout=None):
command = shlex_split(command_string)
if background:
def runcmd():
try:
subprocess.run(
command,
env=environment,
timeout=timeout,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
except subprocess.TimeoutExpired:
pass
thread = Thread(target=runcmd, args=())
thread.start()
return 0, None, None
else:
try:
command_output = subprocess.run(
command,
env=environment,
timeout=timeout,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
retcode = command_output.returncode
except subprocess.TimeoutExpired:
retcode = 128
except Exception:
retcode = 255
try:
stdout = command_output.stdout.decode('ascii')
except Exception:
stdout = ''
try:
stderr = command_output.stderr.decode('ascii')
except Exception:
stderr = ''
return retcode, stdout, stderr
#
# Validate a UUID
#
def validateUUID(dom_uuid):
try:
uuid.UUID(dom_uuid)
return True
except Exception:
return False
#
# Parse a Domain XML object
#
def getDomainXML(zkhandler, dom_uuid):
try:
xml = zkhandler.read(('domain.xml', dom_uuid))
except Exception:
return None
# Parse XML using lxml.objectify
parsed_xml = lxml.objectify.fromstring(xml)
return parsed_xml
#
# Get the main details for a VM object from XML
#
def getDomainMainDetails(parsed_xml):
# Get the information we want from it
duuid = str(parsed_xml.uuid)
try:
ddescription = str(parsed_xml.description)
except AttributeError:
ddescription = "N/A"
dname = str(parsed_xml.name)
dmemory = str(parsed_xml.memory)
dmemory_unit = str(parsed_xml.memory.attrib.get('unit'))
if dmemory_unit == 'KiB':
dmemory = int(int(dmemory) / 1024)
elif dmemory_unit == 'GiB':
dmemory = int(int(dmemory) * 1024)
dvcpu = str(parsed_xml.vcpu)
try:
dvcputopo = '{}/{}/{}'.format(parsed_xml.cpu.topology.attrib.get('sockets'), parsed_xml.cpu.topology.attrib.get('cores'), parsed_xml.cpu.topology.attrib.get('threads'))
except Exception:
dvcputopo = 'N/A'
return duuid, dname, ddescription, dmemory, dvcpu, dvcputopo
#
# Get long-format details
#
def getDomainExtraDetails(parsed_xml):
dtype = str(parsed_xml.os.type)
darch = str(parsed_xml.os.type.attrib['arch'])
dmachine = str(parsed_xml.os.type.attrib['machine'])
dconsole = str(parsed_xml.devices.console.attrib['type'])
demulator = str(parsed_xml.devices.emulator)
return dtype, darch, dmachine, dconsole, demulator
#
# Get CPU features
#
def getDomainCPUFeatures(parsed_xml):
dfeatures = []
try:
for feature in parsed_xml.features.getchildren():
dfeatures.append(feature.tag)
except Exception:
pass
return dfeatures
#
# Get disk devices
#
def getDomainDisks(parsed_xml, stats_data):
ddisks = []
for device in parsed_xml.devices.getchildren():
if device.tag == 'disk':
disk_attrib = device.source.attrib
disk_target = device.target.attrib
disk_type = device.attrib.get('type')
disk_stats_list = [x for x in stats_data.get('disk_stats', []) if x.get('name') == disk_attrib.get('name')]
try:
disk_stats = disk_stats_list[0]
except Exception:
disk_stats = {}
if disk_type == 'network':
disk_obj = {
'type': disk_attrib.get('protocol'),
'name': disk_attrib.get('name'),
'dev': disk_target.get('dev'),
'bus': disk_target.get('bus'),
'rd_req': disk_stats.get('rd_req', 0),
'rd_bytes': disk_stats.get('rd_bytes', 0),
'wr_req': disk_stats.get('wr_req', 0),
'wr_bytes': disk_stats.get('wr_bytes', 0)
}
elif disk_type == 'file':
disk_obj = {
'type': 'file',
'name': disk_attrib.get('file'),
'dev': disk_target.get('dev'),
'bus': disk_target.get('bus'),
'rd_req': disk_stats.get('rd_req', 0),
'rd_bytes': disk_stats.get('rd_bytes', 0),
'wr_req': disk_stats.get('wr_req', 0),
'wr_bytes': disk_stats.get('wr_bytes', 0)
}
else:
disk_obj = {}
ddisks.append(disk_obj)
return ddisks
#
# Get a list of disk devices
#
def getDomainDiskList(zkhandler, dom_uuid):
domain_information = getInformationFromXML(zkhandler, dom_uuid)
disk_list = []
for disk in domain_information['disks']:
disk_list.append(disk['name'])
return disk_list
#
# Get domain information from XML
#
def getInformationFromXML(zkhandler, uuid):
"""
Gather information about a VM from the Libvirt XML configuration in the Zookeper database
and return a dict() containing it.
"""
domain_state = zkhandler.read(('domain.state', uuid))
domain_node = zkhandler.read(('domain.node', uuid))
domain_lastnode = zkhandler.read(('domain.last_node', uuid))
domain_failedreason = zkhandler.read(('domain.failed_reason', uuid))
try:
domain_node_limit = zkhandler.read(('domain.meta.node_limit', uuid))
except Exception:
domain_node_limit = None
try:
domain_node_selector = zkhandler.read(('domain.meta.node_selector', uuid))
except Exception:
domain_node_selector = None
try:
domain_node_autostart = zkhandler.read(('domain.meta.autostart', uuid))
except Exception:
domain_node_autostart = None
try:
domain_migration_method = zkhandler.read(('domain.meta.migrate_method', uuid))
except Exception:
domain_migration_method = None
if not domain_node_limit:
domain_node_limit = None
else:
domain_node_limit = domain_node_limit.split(',')
if not domain_node_autostart:
domain_node_autostart = None
try:
domain_profile = zkhandler.read(('domain.profile', uuid))
except Exception:
domain_profile = None
try:
domain_vnc = zkhandler.read(('domain.console.vnc', uuid))
domain_vnc_listen, domain_vnc_port = domain_vnc.split(':')
except Exception:
domain_vnc_listen = 'None'
domain_vnc_port = 'None'
parsed_xml = getDomainXML(zkhandler, uuid)
try:
stats_data = loads(zkhandler.read(('domain.stats', uuid)))
except Exception:
stats_data = {}
domain_uuid, domain_name, domain_description, domain_memory, domain_vcpu, domain_vcputopo = getDomainMainDetails(parsed_xml)
domain_networks = getDomainNetworks(parsed_xml, stats_data)
domain_type, domain_arch, domain_machine, domain_console, domain_emulator = getDomainExtraDetails(parsed_xml)
domain_features = getDomainCPUFeatures(parsed_xml)
domain_disks = getDomainDisks(parsed_xml, stats_data)
domain_controllers = getDomainControllers(parsed_xml)
if domain_lastnode:
domain_migrated = 'from {}'.format(domain_lastnode)
else:
domain_migrated = 'no'
domain_information = {
'name': domain_name,
'uuid': domain_uuid,
'state': domain_state,
'node': domain_node,
'last_node': domain_lastnode,
'migrated': domain_migrated,
'failed_reason': domain_failedreason,
'node_limit': domain_node_limit,
'node_selector': domain_node_selector,
'node_autostart': bool(strtobool(domain_node_autostart)),
'migration_method': domain_migration_method,
'description': domain_description,
'profile': domain_profile,
'memory': int(domain_memory),
'memory_stats': stats_data.get('mem_stats', {}),
'vcpu': int(domain_vcpu),
'vcpu_topology': domain_vcputopo,
'vcpu_stats': stats_data.get('cpu_stats', {}),
'networks': domain_networks,
'type': domain_type,
'arch': domain_arch,
'machine': domain_machine,
'console': domain_console,
'vnc': {
'listen': domain_vnc_listen,
'port': domain_vnc_port
},
'emulator': domain_emulator,
'features': domain_features,
'disks': domain_disks,
'controllers': domain_controllers,
'xml': lxml.etree.tostring(parsed_xml, encoding='ascii', method='xml').decode().replace('\"', '\'')
}
return domain_information
#
# Get network devices
#
def getDomainNetworks(parsed_xml, stats_data):
dnets = []
for device in parsed_xml.devices.getchildren():
if device.tag == 'interface':
try:
net_type = device.attrib.get('type')
except Exception:
net_type = None
try:
net_mac = device.mac.attrib.get('address')
except Exception:
net_mac = None
try:
net_bridge = device.source.attrib.get(net_type)
except Exception:
net_bridge = None
try:
net_model = device.model.attrib.get('type')
except Exception:
net_model = None
try:
net_stats_list = [x for x in stats_data.get('net_stats', []) if x.get('bridge') == net_bridge]
net_stats = net_stats_list[0]
except Exception:
net_stats = {}
net_rd_bytes = net_stats.get('rd_bytes', 0)
net_rd_packets = net_stats.get('rd_packets', 0)
net_rd_errors = net_stats.get('rd_errors', 0)
net_rd_drops = net_stats.get('rd_drops', 0)
net_wr_bytes = net_stats.get('wr_bytes', 0)
net_wr_packets = net_stats.get('wr_packets', 0)
net_wr_errors = net_stats.get('wr_errors', 0)
net_wr_drops = net_stats.get('wr_drops', 0)
if net_type == 'direct':
net_vni = 'macvtap:' + device.source.attrib.get('dev')
net_bridge = device.source.attrib.get('dev')
elif net_type == 'hostdev':
net_vni = 'hostdev:' + str(device.sriov_device)
net_bridge = str(device.sriov_device)
else:
net_vni = re_match(r'[vm]*br([0-9a-z]+)', net_bridge).group(1)
net_obj = {
'type': net_type,
'vni': net_vni,
'mac': net_mac,
'source': net_bridge,
'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 == '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)