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Rework common library for new zkhandler

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This commit is contained in:
Joshua Boniface
2021-05-29 20:35:28 -04:00
parent 6205dba451
commit b186a75b4e
1 changed files with 47 additions and 74 deletions
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121
daemon-common/common.py
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@@ -30,8 +30,6 @@ from re import match as re_match
from distutils.util import strtobool
import daemon_lib.zkhandler as zkhandler
###############################################################################
# Supplemental functions
###############################################################################
@@ -77,34 +75,12 @@ def validateUUID(dom_uuid):
return False
#
# Connect and disconnect from Zookeeper
#
def startZKConnection(zk_host):
zk_conn = kazoo.client.KazooClient(hosts=zk_host)
try:
zk_conn.start()
except kazoo.handlers.threading.KazooTimeoutError:
print('Timed out connecting to Zookeeper at "{}".'.format(zk_host))
exit(1)
except Exception as e:
print('Failed to connect to Zookeeper at "{}": {}'.format(zk_host, e))
exit(1)
return zk_conn
def stopZKConnection(zk_conn):
zk_conn.stop()
zk_conn.close()
return 0
#
# Parse a Domain XML object
#
def getDomainXML(zk_conn, dom_uuid):
def getDomainXML(zkhandler, dom_uuid):
try:
xml = zkhandler.readdata(zk_conn, '/domains/{}/xml'.format(dom_uuid))
xml = zkhandler.read('/domains/{}/xml'.format(dom_uuid))
except Exception:
return None
@@ -214,8 +190,8 @@ def getDomainDisks(parsed_xml, stats_data):
#
# Get a list of disk devices
#
def getDomainDiskList(zk_conn, dom_uuid):
domain_information = getInformationFromXML(zk_conn, dom_uuid)
def getDomainDiskList(zkhandler, dom_uuid):
domain_information = getInformationFromXML(zkhandler, dom_uuid)
disk_list = []
for disk in domain_information['disks']:
disk_list.append(disk['name'])
@@ -226,30 +202,30 @@ def getDomainDiskList(zk_conn, dom_uuid):
#
# Get domain information from XML
#
def getInformationFromXML(zk_conn, uuid):
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.readdata(zk_conn, '/domains/{}/state'.format(uuid))
domain_node = zkhandler.readdata(zk_conn, '/domains/{}/node'.format(uuid))
domain_lastnode = zkhandler.readdata(zk_conn, '/domains/{}/lastnode'.format(uuid))
domain_failedreason = zkhandler.readdata(zk_conn, '/domains/{}/failedreason'.format(uuid))
domain_state = zkhandler.read('/domains/{}/state'.format(uuid))
domain_node = zkhandler.read('/domains/{}/node'.format(uuid))
domain_lastnode = zkhandler.read('/domains/{}/lastnode'.format(uuid))
domain_failedreason = zkhandler.read('/domains/{}/failedreason'.format(uuid))
try:
domain_node_limit = zkhandler.readdata(zk_conn, '/domains/{}/node_limit'.format(uuid))
domain_node_limit = zkhandler.read('/domains/{}/node_limit'.format(uuid))
except Exception:
domain_node_limit = None
try:
domain_node_selector = zkhandler.readdata(zk_conn, '/domains/{}/node_selector'.format(uuid))
domain_node_selector = zkhandler.read('/domains/{}/node_selector'.format(uuid))
except Exception:
domain_node_selector = None
try:
domain_node_autostart = zkhandler.readdata(zk_conn, '/domains/{}/node_autostart'.format(uuid))
domain_node_autostart = zkhandler.read('/domains/{}/node_autostart'.format(uuid))
except Exception:
domain_node_autostart = None
try:
domain_migration_method = zkhandler.readdata(zk_conn, '/domains/{}/migration_method'.format(uuid))
domain_migration_method = zkhandler.read('/domains/{}/migration_method'.format(uuid))
except Exception:
domain_migration_method = None
@@ -262,21 +238,21 @@ def getInformationFromXML(zk_conn, uuid):
domain_node_autostart = None
try:
domain_profile = zkhandler.readdata(zk_conn, '/domains/{}/profile'.format(uuid))
domain_profile = zkhandler.read('/domains/{}/profile'.format(uuid))
except Exception:
domain_profile = None
try:
domain_vnc = zkhandler.readdata(zk_conn, '/domains/{}/vnc'.format(uuid))
domain_vnc = zkhandler.read('/domains/{}/vnc'.format(uuid))
domain_vnc_listen, domain_vnc_port = domain_vnc.split(':')
except Exception:
domain_vnc_listen = 'None'
domain_vnc_port = 'None'
parsed_xml = getDomainXML(zk_conn, uuid)
parsed_xml = getDomainXML(zkhandler, uuid)
try:
stats_data = loads(zkhandler.readdata(zk_conn, '/domains/{}/stats'.format(uuid)))
stats_data = loads(zkhandler.read('/domains/{}/stats'.format(uuid)))
except Exception:
stats_data = {}
@@ -409,21 +385,18 @@ def getDomainControllers(parsed_xml):
#
# Verify node is valid in cluster
#
def verifyNode(zk_conn, node):
if zkhandler.exists(zk_conn, '/nodes/{}'.format(node)):
return True
else:
return False
def verifyNode(zkhandler, node):
return zkhandler.exists(zkhandler, '/nodes/{}'.format(node))
#
# Get the primary coordinator node
#
def getPrimaryNode(zk_conn):
def getPrimaryNode(zkhandler):
failcount = 0
while True:
try:
primary_node = zkhandler.readdata(zk_conn, '/primary_node')
primary_node = zkhandler.read('/primary_node')
except Exception:
primary_node == 'none'
@@ -444,10 +417,10 @@ def getPrimaryNode(zk_conn):
#
# Find a migration target
#
def findTargetNode(zk_conn, dom_uuid):
def findTargetNode(zkhandler, dom_uuid):
# Determine VM node limits; set config value if read fails
try:
node_limit = zkhandler.readdata(zk_conn, '/domains/{}/node_limit'.format(dom_uuid)).split(',')
node_limit = zkhandler.read('/domains/{}/node_limit'.format(dom_uuid)).split(',')
if not any(node_limit):
node_limit = None
except Exception:
@@ -455,30 +428,30 @@ def findTargetNode(zk_conn, dom_uuid):
# Determine VM search field or use default; set config value if read fails
try:
search_field = zkhandler.readdata(zk_conn, '/domains/{}/node_selector'.format(dom_uuid))
search_field = zkhandler.read('/domains/{}/node_selector'.format(dom_uuid))
except Exception:
search_field = 'mem'
# Execute the search
if search_field == 'mem':
return findTargetNodeMem(zk_conn, node_limit, dom_uuid)
return findTargetNodeMem(zkhandler, node_limit, dom_uuid)
if search_field == 'load':
return findTargetNodeLoad(zk_conn, node_limit, dom_uuid)
return findTargetNodeLoad(zkhandler, node_limit, dom_uuid)
if search_field == 'vcpus':
return findTargetNodeVCPUs(zk_conn, node_limit, dom_uuid)
return findTargetNodeVCPUs(zkhandler, node_limit, dom_uuid)
if search_field == 'vms':
return findTargetNodeVMs(zk_conn, node_limit, dom_uuid)
return findTargetNodeVMs(zkhandler, node_limit, dom_uuid)
# Nothing was found
return None
# Get the list of valid target nodes
def getNodes(zk_conn, node_limit, dom_uuid):
def getNodes(zkhandler, node_limit, dom_uuid):
valid_node_list = []
full_node_list = zkhandler.listchildren(zk_conn, '/nodes')
full_node_list = zkhandler.children('/nodes')
try:
current_node = zkhandler.readdata(zk_conn, '/domains/{}/node'.format(dom_uuid))
current_node = zkhandler.read('/domains/{}/node'.format(dom_uuid))
except kazoo.exceptions.NoNodeError:
current_node = None
@@ -486,8 +459,8 @@ def getNodes(zk_conn, node_limit, dom_uuid):
if node_limit and node not in node_limit:
continue
daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node))
domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(node))
daemon_state = zkhandler.read('/nodes/{}/daemonstate'.format(node))
domain_state = zkhandler.read('/nodes/{}/domainstate'.format(node))
if node == current_node:
continue
@@ -501,15 +474,15 @@ def getNodes(zk_conn, node_limit, dom_uuid):
# via free memory (relative to allocated memory)
def findTargetNodeMem(zk_conn, node_limit, dom_uuid):
def findTargetNodeMem(zkhandler, node_limit, dom_uuid):
most_provfree = 0
target_node = None
node_list = getNodes(zk_conn, node_limit, dom_uuid)
node_list = getNodes(zkhandler, node_limit, dom_uuid)
for node in node_list:
memprov = int(zkhandler.readdata(zk_conn, '/nodes/{}/memprov'.format(node)))
memused = int(zkhandler.readdata(zk_conn, '/nodes/{}/memused'.format(node)))
memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(node)))
memprov = int(zkhandler.read('/nodes/{}/memprov'.format(node)))
memused = int(zkhandler.read('/nodes/{}/memused'.format(node)))
memfree = int(zkhandler.read('/nodes/{}/memfree'.format(node)))
memtotal = memused + memfree
provfree = memtotal - memprov
@@ -521,13 +494,13 @@ def findTargetNodeMem(zk_conn, node_limit, dom_uuid):
# via load average
def findTargetNodeLoad(zk_conn, node_limit, dom_uuid):
def findTargetNodeLoad(zkhandler, node_limit, dom_uuid):
least_load = 9999.0
target_node = None
node_list = getNodes(zk_conn, node_limit, dom_uuid)
node_list = getNodes(zkhandler, node_limit, dom_uuid)
for node in node_list:
load = float(zkhandler.readdata(zk_conn, '/nodes/{}/cpuload'.format(node)))
load = float(zkhandler.read('/nodes/{}/cpuload'.format(node)))
if load < least_load:
least_load = load
@@ -537,13 +510,13 @@ def findTargetNodeLoad(zk_conn, node_limit, dom_uuid):
# via total vCPUs
def findTargetNodeVCPUs(zk_conn, node_limit, dom_uuid):
def findTargetNodeVCPUs(zkhandler, node_limit, dom_uuid):
least_vcpus = 9999
target_node = None
node_list = getNodes(zk_conn, node_limit, dom_uuid)
node_list = getNodes(zkhandler, node_limit, dom_uuid)
for node in node_list:
vcpus = int(zkhandler.readdata(zk_conn, '/nodes/{}/vcpualloc'.format(node)))
vcpus = int(zkhandler.read('/nodes/{}/vcpualloc'.format(node)))
if vcpus < least_vcpus:
least_vcpus = vcpus
@@ -553,13 +526,13 @@ def findTargetNodeVCPUs(zk_conn, node_limit, dom_uuid):
# via total VMs
def findTargetNodeVMs(zk_conn, node_limit, dom_uuid):
def findTargetNodeVMs(zkhandler, node_limit, dom_uuid):
least_vms = 9999
target_node = None
node_list = getNodes(zk_conn, node_limit, dom_uuid)
node_list = getNodes(zkhandler, node_limit, dom_uuid)
for node in node_list:
vms = int(zkhandler.readdata(zk_conn, '/nodes/{}/domainscount'.format(node)))
vms = int(zkhandler.read('/nodes/{}/domainscount'.format(node)))
if vms < least_vms:
least_vms = vms