mirror of
https://github.com/release-engineering/repo-autoindex.git
synced 2025-02-24 06:02:54 +00:00
137388d475
startElement signature changed in the .pyi stubs for XML classes, triggering a mypy complaint here. Suppress it as there is no actual error here.
256 lines
8.1 KiB
Python
256 lines
8.1 KiB
Python
import datetime
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import logging
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import os
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from collections.abc import AsyncGenerator, Generator, Iterable, Mapping
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from dataclasses import dataclass
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from typing import BinaryIO, Optional, Type, Any
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from xml.dom.minidom import Element
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from xml.dom.pulldom import END_ELEMENT, START_ELEMENT
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from xml.sax.handler import ContentHandler
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from defusedxml import pulldom, sax # type: ignore
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from .base import (
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ICON_PACKAGE,
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GeneratedIndex,
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IOFetcher,
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IndexEntry,
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Repo,
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ContentError,
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)
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from .template import TemplateContext
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from .tree import treeify
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LOG = logging.getLogger("autoindex")
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def assert_repodata_ok(condition: Any, msg: str):
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if not condition:
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raise ContentError(msg)
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def get_tag(elem: Element, name: str) -> Element:
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elems: list[Element] = elem.getElementsByTagName(name)
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assert_repodata_ok(len(elems) == 1, f"expected exactly one {name} tag")
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return elems[0]
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def get_text_tag(elem: Element, name: str) -> str:
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tagnode = get_tag(elem, name)
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child = tagnode.firstChild
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assert_repodata_ok(child, f"missing text {name} tag")
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return str(child.toxml()) # type: ignore
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@dataclass
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class Package:
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href: str
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time: str
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size: int
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@property
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def index_entry(self) -> IndexEntry:
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return IndexEntry(
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icon=ICON_PACKAGE,
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href=self.href,
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text=os.path.basename(self.href),
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time=datetime.datetime.utcfromtimestamp(float(self.time)).isoformat(),
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size=str(self.size),
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)
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def pulldom_elements(
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xml_str: str, path_matcher, attr_matcher=lambda _: True
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) -> Generator[Element, None, None]:
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stream = pulldom.parseString(xml_str)
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current_path = []
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for event, node in stream:
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if event == START_ELEMENT:
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current_path.append(node.tagName)
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if path_matcher(current_path) and attr_matcher(node.attributes):
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stream.expandNode(node)
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yield node
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# expandNode makes it so that we don't get END_ELEMENT any more
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# for this node, so pop here.
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current_path.pop()
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elif event == END_ELEMENT:
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LOG.debug("leaving element %s", current_path)
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current_path.pop()
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class PackagesParser(ContentHandler):
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# SAX-integrated parser to load Package instances from a primary XML.
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#
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# We use this rather than pulldom because the pulldom memory usage while
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# parsing a large primary XML seems unreasonably high.
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#
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def __init__(self) -> None:
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self.current_path: list[str] = []
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self.current_package: Optional[Package] = None
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self.packages: list[Package] = []
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def parse(self, xml: BinaryIO) -> Iterable[Package]:
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self.packages = []
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# Parse the XML document; this will invoke our start/end element handlers
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# which in turn will populate self.packages
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sax.parse(xml, self)
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return self.packages
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def startElement(self, name: str, attrs: Mapping[str, Any]): # type: ignore
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self.current_path.append(name)
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LOG.debug("entering element %s", self.current_path)
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if self.current_path == ["metadata", "package"] and attrs.get("type") == "rpm":
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self.current_package = Package("<unknown package>", "", 0)
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elif self.current_path == ["metadata", "package", "location"]:
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assert self.current_package
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self.current_package.href = attrs["href"]
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elif self.current_path == ["metadata", "package", "time"]:
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assert self.current_package
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self.current_package.time = attrs["file"]
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elif self.current_path == ["metadata", "package", "size"]:
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assert self.current_package
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self.current_package.size = attrs["package"]
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def endElement(self, _name: str):
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LOG.debug("leaving element %s", self.current_path)
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if self.current_path == ["metadata", "package"]:
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assert self.current_package
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self.packages.append(self.current_package)
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self.current_package = None
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self.current_path.pop()
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class YumRepo(Repo):
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async def render_index(
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self, index_href_suffix: str
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) -> AsyncGenerator[GeneratedIndex, None]:
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LOG.debug("repomd.xml: %s", self.entry_point_content)
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entries = []
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entries.extend(await self._repodata_entries())
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entries.extend(await self._package_entries())
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for page in self.__render_entries(entries, index_href_suffix):
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yield page
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async def _repodata_entries(self) -> list[IndexEntry]:
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out = []
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# There's always an entry for repomd.xml itself...
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size = len(self.entry_point_content)
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time = "-"
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revision_nodes = list(
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pulldom_elements(
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self.entry_point_content,
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path_matcher=lambda p: p == ["repomd", "revision"],
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)
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)
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if len(revision_nodes) == 1:
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timestamp_node = revision_nodes[0].firstChild
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assert_repodata_ok(timestamp_node, "missing timestamp node")
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time = datetime.datetime.utcfromtimestamp(
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int(timestamp_node.toxml()) # type: ignore
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).isoformat()
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out.append(
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IndexEntry(
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href="repodata/repomd.xml",
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text="repomd.xml",
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time=time,
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size=str(size),
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)
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)
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data_nodes = list(
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pulldom_elements(
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self.entry_point_content,
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path_matcher=lambda p: p == ["repomd", "data"],
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attr_matcher=lambda attrs: attrs.get("type"),
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)
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)
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data_nodes.sort(key=lambda node: str(node.attributes["type"].value))
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for node in data_nodes:
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href = get_tag(node, "location").attributes["href"].value
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basename = os.path.basename(href)
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timestamp = get_text_tag(node, "timestamp")
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time = datetime.datetime.utcfromtimestamp(float(timestamp)).isoformat()
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size = int(get_text_tag(node, "size"))
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out.append(
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IndexEntry(
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href=href,
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text=basename,
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time=time,
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size=str(size),
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)
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)
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return out
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async def _package_entries(self) -> list[IndexEntry]:
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primary_nodes = list(
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pulldom_elements(
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self.entry_point_content,
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path_matcher=lambda p: p == ["repomd", "data"],
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attr_matcher=lambda attrs: attrs.get("type")
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and attrs["type"].value == "primary",
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)
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)
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assert len(primary_nodes) == 1
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primary_node = primary_nodes[0]
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location = get_tag(primary_node, "location")
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href = location.attributes["href"].value
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primary_url = "/".join([self.base_url, href])
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primary_xml = await self.fetcher(primary_url)
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assert_repodata_ok(primary_xml, f"missing primary XML at {primary_url}")
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return sorted(
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[p.index_entry for p in self.__packages_from_primary(primary_xml)], # type: ignore
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key=lambda e: e.text,
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)
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def __packages_from_primary(self, primary_xml: BinaryIO) -> Iterable[Package]:
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return PackagesParser().parse(primary_xml)
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def __render_entries(
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self,
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entries: Iterable[IndexEntry],
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index_href_suffix: str,
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) -> Generator[GeneratedIndex, None, None]:
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ctx = TemplateContext()
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nodes = [treeify(entries, index_href_suffix=index_href_suffix)]
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while nodes:
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node = nodes.pop()
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yield GeneratedIndex(
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content=ctx.render_index(index_entries=node.entries),
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relative_dir=node.relative_dir,
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)
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nodes.extend(node.children)
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@classmethod
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async def probe(
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cls: Type["YumRepo"],
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fetcher: IOFetcher,
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url: str,
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) -> Optional["YumRepo"]:
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repomd_xml_url = f"{url}/repodata/repomd.xml"
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repomd_xml = await fetcher(repomd_xml_url)
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if repomd_xml is None:
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# not yum repo
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return None
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# it is a yum repo
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return cls(url, repomd_xml.read().decode(), fetcher)
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