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webvirtcloud/vrtManager/util.py
Ing. Jan KRCMAR 15d7216368 page speed serving enhancements
handle xml doc enhancements
2018-02-14 15:22:57 +01:00

138 lines
3.1 KiB
Python

import random
import libxml2
import libvirt
import string
def is_kvm_available(xml):
kvm_domains = get_xml_path(xml, "//domain/@type='kvm'")
if kvm_domains > 0:
return True
else:
return False
def randomMAC():
"""Generate a random MAC address."""
# qemu MAC
oui = [0x52, 0x54, 0x00]
mac = oui + [random.randint(0x00, 0xff),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff)]
return ':'.join(map(lambda x: "%02x" % x, mac))
def randomUUID():
"""Generate a random UUID."""
u = [random.randint(0, 255) for dummy in range(0, 16)]
return "-".join(["%02x" * 4, "%02x" * 2, "%02x" * 2, "%02x" * 2, "%02x" * 6]) % tuple(u)
def randomPasswd(length=12, alphabet=string.letters + string.digits):
"""Generate a random password"""
return ''.join([random.choice(alphabet) for i in xrange(length)])
def get_max_vcpus(conn, type=None):
"""@param conn: libvirt connection to poll for max possible vcpus
@type type: optional guest type (kvm, etc.)"""
if type is None:
type = conn.getType()
try:
m = conn.getMaxVcpus(type.lower())
except libvirt.libvirtError:
m = 32
return m
def xml_escape(str):
"""Replaces chars ' " < > & with xml safe counterparts"""
if str is None:
return None
str = str.replace("&", "&amp;")
str = str.replace("'", "&apos;")
str = str.replace("\"", "&quot;")
str = str.replace("<", "&lt;")
str = str.replace(">", "&gt;")
return str
def compareMAC(p, q):
"""Compare two MAC addresses"""
pa = p.split(":")
qa = q.split(":")
if len(pa) != len(qa):
if p > q:
return 1
else:
return -1
for i in xrange(len(pa)):
n = int(pa[i], 0x10) - int(qa[i], 0x10)
if n > 0:
return 1
elif n < 0:
return -1
return 0
def get_xml_path(xml, path=None, func=None):
"""
Return the content from the passed xml xpath, or return the result
of a passed function (receives xpathContext as its only arg)
"""
doc = None
ctx = None
result = None
try:
doc = libxml2.parseDoc(xml)
ctx = doc.xpathNewContext()
if path:
result = get_xpath(ctx, path)
elif func:
result = func(ctx)
else:
raise ValueError("'path' or 'func' is required.")
finally:
if doc:
doc.freeDoc()
if ctx:
ctx.xpathFreeContext()
return result
def get_xpath(ctx, path):
result = None
ret = ctx.xpathEval(path)
if ret is not None:
if type(ret) == list:
if len(ret) >= 1:
result = ret[0].content
else:
result = ret
return result
def pretty_mem(val):
val = int(val)
if val > (10 * 1024 * 1024):
return "%2.2f GB" % (val / (1024.0 * 1024.0))
else:
return "%2.0f MB" % (val / 1024.0)
def pretty_bytes(val):
val = int(val)
if val > (1024 * 1024 * 1024):
return "%2.2f GB" % (val / (1024.0 * 1024.0 * 1024.0))
else:
return "%2.2f MB" % (val / (1024.0 * 1024.0))