82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
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import textwrap
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from enum import Enum
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from collections import UserDict
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import libvirt
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from lxml.etree import SubElement, fromstring, tostring
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class Boot(Enum):
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BIOS = 'bios'
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UEFI = 'uefi'
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class vCPUMode(Enum):
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HOST_MODEL = 'host-model'
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HOST_PASSTHROUGTH = 'host-passthrougth'
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CUSTOM = 'custom'
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MAXIMUM = 'maximum'
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class DomainCapabilities:
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def __init__(self, session: libvirt.virConnect):
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self.session = session
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self.domcaps = fromstring(
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self.session.getDomainCapabilities())
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@property
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def arch(self):
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return self.domcaps.xpath('/domainCapabilities/arch')[0].text
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@property
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def virttype(self):
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return self.domcaps.xpath('/domainCapabilities/domain')[0].text
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@property
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def emulator(self):
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return self.domcaps.xpath('/domainCapabilities/path')[0].text
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@property
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def machine(self):
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return self.domcaps.xpath('/domainCapabilities/machine')[0].text
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def best_cpu(self, mode: vCPUMode) -> str:
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"""
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See https://libvirt.org/html/libvirt-libvirt-host.html
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#virConnectBaselineHypervisorCPU
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"""
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cpus = self.domcaps.xpath(
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f'/domainCapabilities/cpu/mode[@name="{mode}"]')[0]
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cpus.tag = 'cpu'
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for attr in cpus.attrib.keys():
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del cpus.attrib[attr]
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arch = SubElement(cpus, 'arch')
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arch.text = self.arch
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xmlcpus = tostring(cpus, encoding='unicode', pretty_print=True)
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xml = self.session.baselineHypervisorCPU(self.emulator,
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self.arch, self.machine, self.virttype, [xmlcpus])
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return textwrap.indent(xml, ' ' * 2)
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class vCPUTopology(UserDict):
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"""
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CPU topology schema ``{'sockets': 1, 'cores': 4, 'threads': 1}``::
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<topology sockets='1' dies='1' cores='4' threads='1'/>
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"""
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def __init__(self, topology: dict):
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super().__init__(self._validate(topology))
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def _validate(self, topology: dict):
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if isinstance(topology, dict):
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if ['sockets', 'cores', 'threads'] != list(topology.keys()):
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raise ValueError("Topology must have 'sockets', 'cores' "
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"and 'threads' keys.")
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for key in topology.keys():
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if not isinstance(topology[key], int):
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raise TypeError(f"Key '{key}' must be 'int'")
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return topology
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raise TypeError("Topology must be a 'dict'")
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