337 lines
9.9 KiB
Python
337 lines
9.9 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 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, either version 3 of the License, or
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# (at your option) any later version.
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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 uuid
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import lxml
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import math
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import kazoo.client
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import client_lib.zkhandler as zkhandler
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###############################################################################
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# Supplemental functions
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###############################################################################
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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:
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return False
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#
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# Connect and disconnect from Zookeeper
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#
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def startZKConnection(zk_host):
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zk_conn = kazoo.client.KazooClient(hosts=zk_host)
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zk_conn.start()
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return zk_conn
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def stopZKConnection(zk_conn):
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zk_conn.stop()
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zk_conn.close()
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return 0
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#
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# Parse a Domain XML object
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#
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def getDomainXML(zk_conn, dom_uuid):
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try:
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xml = zkhandler.readdata(zk_conn, '/domains/{}/xml'.format(dom_uuid))
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except:
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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['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['sockets'], parsed_xml.cpu.topology.attrib['cores'], parsed_xml.cpu.topology.attrib['threads'])
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except:
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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 = parsed_xml.os.type
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darch = parsed_xml.os.type.attrib['arch']
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dmachine = parsed_xml.os.type.attrib['machine']
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dconsole = parsed_xml.devices.console.attrib['type']
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demulator = 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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for feature in parsed_xml.features.getchildren():
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dfeatures.append(feature.tag)
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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):
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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['type']
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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') }
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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') }
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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 network devices
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#
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def getDomainNetworks(parsed_xml):
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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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net_type = device.attrib['type']
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net_mac = device.mac.attrib['address']
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net_bridge = device.source.attrib[net_type]
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net_model = device.model.attrib['type']
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net_obj = { 'type': net_type, 'mac': net_mac, 'source': net_bridge, 'model': net_model }
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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['type']
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try:
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controller_model = device.attrib['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(zk_conn, node):
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if zkhandler.exists(zk_conn, '/nodes/{}'.format(node)):
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return True
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else:
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return False
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#
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# Get the primary coordinator node
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#
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def getPrimaryNode(zk_conn):
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failcount = 0
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while True:
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try:
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primary_node = zkhandler.readdata(zk_conn, '/primary_node')
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except:
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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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# Get the list of valid target nodes
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#
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def getNodes(zk_conn, dom_uuid):
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valid_node_list = []
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full_node_list = zkhandler.listchildren(zk_conn, '/nodes')
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try:
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current_node = zkhandler.readdata(zk_conn, '/domains/{}/node'.format(dom_uuid))
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except:
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current_node = None
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for node in full_node_list:
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daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node))
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domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(node))
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if node == current_node:
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continue
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if daemon_state != 'run' or domain_state != 'ready':
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continue
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valid_node_list.append(node)
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if not valid_node_list:
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# We found no valid nodes; possibly they're all flushed or all down. Return the entire list instead.
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valid_node_list = full_node_list
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return valid_node_list
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#
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# Find a migration target
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#
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def findTargetNode(zk_conn, search_field, dom_uuid):
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if search_field == 'mem':
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return findTargetNodeMem(zk_conn, dom_uuid)
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if search_field == 'load':
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return findTargetNodeLoad(zk_conn, dom_uuid)
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if search_field == 'vcpus':
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return findTargetNodeVCPUs(zk_conn, dom_uuid)
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if search_field == 'vms':
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return findTargetNodeVMs(zk_conn, dom_uuid)
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return None
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# via allocated memory
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def findTargetNodeMem(zk_conn, dom_uuid):
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least_alloc = math.inf
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target_node = None
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node_list = getNodes(zk_conn, dom_uuid)
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for node in node_list:
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alloc = float(zkhandler.readdata(zk_conn, '/nodes/{}/memalloc'.format(node)))
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if alloc < least_alloc:
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least_alloc = alloc
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target_node = node
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return target_node
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# via load average
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def findTargetNodeLoad(zk_conn, dom_uuid):
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least_load = math.inf
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target_node = None
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node_list = getNodes(zk_conn, dom_uuid)
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for node in node_list:
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load = float(zkhandler.readdata(zk_conn, '/nodes/{}/cpuload'.format(node)))
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if load < least_load:
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least_load = load
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target_node = node
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return target_node
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# via total vCPUs
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def findTargetNodeVCPUs(zk_conn, dom_uuid):
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least_vcpus = math.inf
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target_node = None
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node_list = getNodes(zk_conn, dom_uuid)
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for node in node_list:
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vcpus = float(zkhandler.readdata(zk_conn, '/nodes/{}/vcpualloc'.format(node)))
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if vcpus < least_vcpus:
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least_vcpus = vcpus
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target_node = node
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return target_node
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# via total VMs
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def findTargetNodeVMs(zk_conn, dom_uuid):
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least_vms = math.inf
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target_node = None
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node_list = getNodes(zk_conn, dom_uuid)
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for node in node_list:
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vms = float(zkhandler.readdata(zk_conn, '/nodes/{}/domainscount'.format(node)))
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if vms < least_vms:
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least_vms = vms
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target_node = node
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return target_node
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# Connect to the primary host and run a command
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def runRemoteCommand(node, command, become=False):
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import paramiko
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import hashlib
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import dns.resolver
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import dns.flags
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# Support doing SSHFP checks
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class DnssecPolicy(paramiko.client.MissingHostKeyPolicy):
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def missing_host_key(self, client, hostname, key):
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sshfp_expect = hashlib.sha1(key.asbytes()).hexdigest()
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ans = dns.resolver.query(hostname, 'SSHFP')
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if not ans.response.flags & dns.flags.DO:
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raise AssertionError('Answer is not DNSSEC signed')
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for answer in ans.response.answer:
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for item in answer.items:
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if sshfp_expect in item.to_text():
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client._log(paramiko.common.DEBUG, 'Found {} in SSHFP for host {}'.format(key.get_name(), hostname))
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return
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raise AssertionError('SSHFP not published in DNS')
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if become:
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command = 'sudo ' + command
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ssh_client = paramiko.client.SSHClient()
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ssh_client.load_system_host_keys()
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ssh_client.set_missing_host_key_policy(DnssecPolicy())
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#ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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ssh_client.connect(node)
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stdin, stdout, stderr = ssh_client.exec_command(command)
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return stdout.read().decode('ascii').rstrip(), stderr.read().decode('ascii').rstrip()
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