pvc/pvcf.py

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#!/usr/bin/env python3
# pvcf.py - Supplemental functions for the PVC CLI client
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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/>.
#
###############################################################################
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import os, sys, libvirt, uuid, kazoo.client, lxml.objectify, click, ansiiprint
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#
# Validate a UUID
#
def validateUUID(dom_uuid):
try:
uuid.UUID(dom_uuid)
return True
except:
return False
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#
# Connect and disconnect from Zookeeper
#
def startZKConnection(zk_host):
zk = kazoo.client.KazooClient(hosts=zk_host)
zk.start()
return zk
def stopZKConnection(zk):
zk.stop()
zk.close()
return 0
#
# XML information parsing functions
#
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def getInformationFromXML(zk, uuid, long_output):
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# Obtain the contents of the XML from Zookeeper
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try:
xml = zk.get('/domains/%s/xml' % uuid)[0].decode('ascii')
dstate = zk.get('/domains/%s/state' % uuid)[0].decode('ascii')
dhypervisor = zk.get('/domains/%s/hypervisor' % uuid)[0].decode('ascii')
dlasthypervisor = zk.get('/domains/%s/lasthypervisor' % uuid)[0].decode('ascii')
except:
return None
if dlasthypervisor == '':
dlasthypervisor = 'N/A'
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# Parse XML using lxml.objectify
parsed_xml = lxml.objectify.fromstring(xml)
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# Get the information we want from it
duuid = parsed_xml.uuid
dname = parsed_xml.name
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dmemory = parsed_xml.memory
dmemory_unit = parsed_xml.memory.attrib['unit']
dvcpu = parsed_xml.vcpu
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try:
dvcputopo = '{}/{}/{}'.format(parsed_xml.cpu.topology.attrib['sockets'], parsed_xml.cpu.topology.attrib['cores'], parsed_xml.cpu.topology.attrib['threads'])
except:
dvcputopo = 'N/A'
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dtype = parsed_xml.os.type
darch = parsed_xml.os.type.attrib['arch']
dmachine = parsed_xml.os.type.attrib['machine']
dfeatures = []
for feature in parsed_xml.features.getchildren():
dfeatures.append(feature.tag)
dconsole = parsed_xml.devices.console.attrib['type']
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demulator = parsed_xml.devices.emulator
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ddisks = []
dnets = []
dcontrollers = []
for device in parsed_xml.devices.getchildren():
if device.tag == 'disk':
disk_attrib = device.source.attrib
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disk_target = device.target.attrib
disk_type = device.attrib['type']
if disk_type == 'network':
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disk_obj = { 'type': disk_attrib.get('protocol'), 'name': disk_attrib.get('name'), 'dev': disk_target.get('dev'), 'bus': disk_target.get('bus') }
elif disk_type == 'file':
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disk_obj = { 'type': 'file', 'name': disk_attrib.get('file'), 'dev': disk_target.get('dev'), 'bus': disk_target.get('bus') }
else:
disk_obj = {}
ddisks.append(disk_obj)
if device.tag == 'interface':
net_type = device.attrib['type']
net_mac = device.mac.attrib['address']
net_bridge = device.source.attrib[net_type]
net_model = device.model.attrib['type']
net_obj = { 'type': net_type, 'mac': net_mac, 'source': net_bridge, 'model': net_model }
dnets.append(net_obj)
if device.tag == 'controller':
controller_type = device.attrib['type']
try:
controller_model = device.attrib['model']
except KeyError:
controller_model = 'none'
controller_obj = { 'type': controller_type, 'model': controller_model }
dcontrollers.append(controller_obj)
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# Format a nice output; do this line-by-line then concat the elements at the end
ainformation = []
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ainformation.append('{}Virtual machine information:{}'.format(ansiiprint.bold(), ansiiprint.end()))
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ainformation.append('')
# Basic information
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ainformation.append('{}UUID:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), duuid))
ainformation.append('{}Name:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dname))
ainformation.append('{}Memory:{} {} {}'.format(ansiiprint.purple(), ansiiprint.end(), dmemory, dmemory_unit))
ainformation.append('{}vCPUs:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dvcpu))
ainformation.append('{}Topology [S/C/T]:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dvcputopo))
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if long_output == True:
# Virtualization information
ainformation.append('')
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ainformation.append('{}Emulator:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), demulator))
ainformation.append('{}Type:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dtype))
ainformation.append('{}Arch:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), darch))
ainformation.append('{}Machine:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dmachine))
ainformation.append('{}Features:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), ' '.join(dfeatures)))
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# PVC cluster information
ainformation.append('')
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dstate_colour = {
'start': ansiiprint.green(),
'stop': ansiiprint.red(),
'shutdown': ansiiprint.yellow(),
'migrate': ansiiprint.blue(),
'unmigrate': ansiiprint.blue()
}
ainformation.append('{}State:{} {}{}{}'.format(ansiiprint.purple(), ansiiprint.end(), dstate_colour[dstate], dstate, ansiiprint.end()))
ainformation.append('{}Active Hypervisor:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dhypervisor))
ainformation.append('{}Last Hypervisor:{} {}'.format(ansiiprint.purple(), ansiiprint.end(), dlasthypervisor))
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if long_output == True:
# Disk list
ainformation.append('')
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name_length = 0
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for disk in ddisks:
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_name_length = len(disk['name']) + 1
if _name_length > name_length:
name_length = _name_length
ainformation.append('{0}Disks:{1} {2}ID Type {3: <{width}} Dev Bus{4}'.format(ansiiprint.purple(), ansiiprint.end(), ansiiprint.bold(), 'Name', ansiiprint.end(), width=name_length))
for disk in ddisks:
ainformation.append(' {0: <3} {1: <5} {2: <{width}} {3: <4} {4: <5}'.format(ddisks.index(disk), disk['type'], disk['name'], disk['dev'], disk['bus'], width=name_length))
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# Network list
ainformation.append('')
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ainformation.append('{}Interfaces:{} {}ID Type Source Model MAC{}'.format(ansiiprint.purple(), ansiiprint.end(), ansiiprint.bold(), ansiiprint.end()))
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for net in dnets:
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ainformation.append(' {0: <3} {1: <8} {2: <10} {3: <8} {4}'.format(dnets.index(net), net['type'], net['source'], net['model'], net['mac']))
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# Controller list
ainformation.append('')
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ainformation.append('{}Controllers:{} {}ID Type Model{}'.format(ansiiprint.purple(), ansiiprint.end(), ansiiprint.bold(), ansiiprint.end()))
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for controller in dcontrollers:
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ainformation.append(' {0: <3} {1: <14} {2: <8}'.format(dcontrollers.index(controller), controller['type'], controller['model']))
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# Join it all together
information = '\n'.join(ainformation)
return information
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#
# Cluster search functions
#
def getClusterDomainList(zk):
# Get a list of UUIDs by listing the children of /domains
uuid_list = zk.get_children('/domains')
name_list = []
# For each UUID, get the corresponding name from the data
for uuid in uuid_list:
name_list.append(zk.get('/domains/%s' % uuid)[0].decode('ascii'))
return uuid_list, name_list
def searchClusterByUUID(zk, uuid):
try:
# Get the lists
uuid_list, name_list = getClusterDomainList(zk)
# We're looking for UUID, so find that element ID
index = uuid_list.index(uuid)
# Get the name_list element at that index
name = name_list[index]
except ValueError:
# We didn't find anything
return None
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return name
def searchClusterByName(zk, name):
try:
# Get the lists
uuid_list, name_list = getClusterDomainList(zk)
# We're looking for name, so find that element ID
index = name_list.index(name)
# Get the uuid_list element at that index
uuid = uuid_list[index]
except ValueError:
# We didn't find anything
return None
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return uuid
#
# Allow mutually exclusive options in Click
#
class MutuallyExclusiveOption(click.Option):
def __init__(self, *args, **kwargs):
meargs = kwargs.pop('mutually_exclusive', [])
_me_arg = []
_me_func = []
for arg in meargs:
_me_arg.append(arg['argument'])
_me_func.append(arg['function'])
self.me_arg = set(_me_arg)
self.me_func = set(_me_func)
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help = kwargs.get('help', '')
if self.me_func:
ex_str = ', '.join(self.me_arg)
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kwargs['help'] = help + (
' Mutually exclusive with `' + ex_str + '`.'
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)
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super(MutuallyExclusiveOption, self).__init__(*args, **kwargs)
def handle_parse_result(self, ctx, opts, args):
if self.me_func.intersection(opts) and self.name in opts:
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raise click.UsageError(
"Illegal usage: `{}` is mutually exclusive with "
"arguments `{}`.".format(
self.opts[-1],
', '.join(self.me_arg)
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)
)
return super(MutuallyExclusiveOption, self).handle_parse_result(
ctx,
opts,
args
)