74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
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from lxml.etree import Element, QName, SubElement
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class Constructor:
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"""
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The XML constructor. This class builds XML configs for libvirt.
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"""
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def construct_xml(self,
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tag: dict,
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namespace: str | None = None,
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nsprefix: str | None = None,
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root: Element = None) -> Element:
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"""
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Shortly this recursive function transforms dictonary to XML.
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Return etree.Element built from dict with following structure::
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{
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'name': 'device', # tag name
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'text': '', # optional key
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'values': { # optional key, must be a dict of key-value pairs
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'type': 'disk'
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},
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children: [] # optional key, must be a list of dicts
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}
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Child elements must have the same structure. Infinite `children` nesting
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is allowed.
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"""
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use_ns = False
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if isinstance(namespace, str) and isinstance(nsprefix, str):
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use_ns = True
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# Create element
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if root is None:
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if use_ns:
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element = Element(QName(namespace, tag['name']),
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nsmap={nsprefix: namespace})
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else:
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element = Element(tag['name'])
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else:
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if use_ns:
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element = SubElement(root, QName(namespace, tag['name']))
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else:
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element = SubElement(root, tag['name'])
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# Fill up element with content
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if 'text' in tag.keys():
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element.text = tag['text']
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if 'values' in tag.keys():
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for key in tag['values'].keys():
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element.set(str(key), str(tag['values'][key]))
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if 'children' in tag.keys():
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for child in tag['children']:
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element.append(
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self.construct_xml(child,
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namespace=namespace,
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nsprefix=nsprefix,
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root=element))
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return element
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def add_meta(self, xml: Element, data: dict,
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namespace: str, nsprefix: str) -> None:
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"""
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Add metadata to domain. See:
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https://libvirt.org/formatdomain.html#general-metadata
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"""
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metadata = metadata_old = xml.xpath('/domain/metadata')[0]
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metadata.append(
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self.construct_xml(
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data,
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namespace=namespace,
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nsprefix=nsprefix,
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))
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xml.replace(metadata_old, metadata)
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