performance(legacy_repository): introduce link cache to improve perfo…

…rmance for legacy repositories

Co-authored-by: Jarrod Moore <jmo@jmo.name>

src/poetry/repositories/link_sources/base.py

@@ -1,9 +1,9 @@
 from __future__ import annotations
 
+import functools
 import logging
 import re
 
-from abc import abstractmethod
 from typing import TYPE_CHECKING
 
 from packaging.utils import canonicalize_name
@@ -15,6 +15,7 @@
 
 
 if TYPE_CHECKING:
+    from collections import defaultdict
     from collections.abc import Iterator
 
     from packaging.utils import NormalizedName
@@ -39,21 +40,16 @@ class LinkSource:
 
     def __init__(self, url: str) -> None:
         self._url = url
+        self._get_link_cache_wrapper = functools.lru_cache(maxsize=1)(
+            self._get_link_cache
+        )
 
     @property
     def url(self) -> str:
         return self._url
 
     def versions(self, name: str) -> Iterator[Version]:
-        name = canonicalize_name(name)
-        seen: set[Version] = set()
-
-        for link in self.links:
-            pkg = self.link_package_data(link)
-
-            if pkg and pkg.name == name and pkg.version not in seen:
-                seen.add(pkg.version)
-                yield pkg.version
+        yield from self._link_cache[canonicalize_name(name)]
 
     @property
     def packages(self) -> Iterator[Package]:
@@ -64,9 +60,10 @@ def packages(self) -> Iterator[Package]:
                 yield pkg
 
     @property
-    @abstractmethod
     def links(self) -> Iterator[Link]:
-        raise NotImplementedError()
+        for links_per_version in self._link_cache.values():
+            for links in links_per_version.values():
+                yield from links
 
     @classmethod
     def link_package_data(cls, link: Link) -> Package | None:
@@ -102,11 +99,7 @@ def link_package_data(cls, link: Link) -> Package | None:
     def links_for_version(
         self, name: NormalizedName, version: Version
     ) -> Iterator[Link]:
-        for link in self.links:
-            pkg = self.link_package_data(link)
-
-            if pkg and pkg.name == name and pkg.version == version:
-                yield link
+        yield from self._link_cache[name][version]
 
     def clean_link(self, url: str) -> str:
         """Makes sure a link is fully encoded.  That is, if a ' ' shows up in
@@ -127,3 +120,14 @@ def yanked(self, name: NormalizedName, version: Version) -> str | bool:
         if reasons:
             return "\n".join(sorted(reasons))
         return True
+
+    @property
+    def _link_cache(
+        self,
+    ) -> defaultdict[NormalizedName, defaultdict[Version, list[Link]]]:
+        return self._get_link_cache_wrapper()
+
+    def _get_link_cache(
+        self,
+    ) -> defaultdict[NormalizedName, defaultdict[Version, list[Link]]]:
+        raise NotImplementedError()

src/poetry/repositories/link_sources/html.py

@@ -3,16 +3,20 @@
 import urllib.parse
 import warnings
 
+from collections import defaultdict
 from html import unescape
 from typing import TYPE_CHECKING
 
+from packaging.utils import canonicalize_name
 from poetry.core.packages.utils.link import Link
+from poetry.core.semver.version import Version
 
 from poetry.repositories.link_sources.base import LinkSource
 
 
 if TYPE_CHECKING:
-    from collections.abc import Iterator
+    from packaging.utils import NormalizedName
+
 
 with warnings.catch_warnings():
     warnings.simplefilter("ignore")
@@ -25,8 +29,12 @@ def __init__(self, url: str, content: str) -> None:
 
         self._parsed = html5lib.parse(content, namespaceHTMLElements=False)
 
-    @property
-    def links(self) -> Iterator[Link]:
+    def _get_link_cache(
+        self,
+    ) -> defaultdict[NormalizedName, defaultdict[Version, list[Link]]]:
+        links: defaultdict[
+            NormalizedName, defaultdict[Version, list[Link]]
+        ] = defaultdict(lambda: defaultdict(list))
         for anchor in self._parsed.findall(".//a"):
             if anchor.get("href"):
                 href = anchor.get("href")
@@ -44,7 +52,14 @@ def links(self) -> Iterator[Link]:
                 if link.ext not in self.SUPPORTED_FORMATS:
                     continue
 
-                yield link
+                pkg = self.link_package_data(link)
+                if pkg:
+                    links[pkg.name][pkg.version].append(link)
+                else:
+                    # dummy name and version
+                    links[canonicalize_name("")][Version.parse("0")].append(link)
+
+        return links
 
 
 class SimpleRepositoryPage(HTMLPage):

tests/repositories/link_sources/test_base.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 
+from collections import defaultdict
 from typing import TYPE_CHECKING
-from unittest.mock import PropertyMock
 
 import pytest
 
+from packaging.utils import NormalizedName
 from packaging.utils import canonicalize_name
 from poetry.core.packages.package import Package
 from poetry.core.packages.utils.link import Link
@@ -22,21 +23,37 @@
 @pytest.fixture
 def link_source(mocker: MockerFixture) -> LinkSource:
     url = "https://example.org"
-    link_source = LinkSource(url)
-    mocker.patch(
-        f"{LinkSource.__module__}.{LinkSource.__qualname__}.links",
-        new_callable=PropertyMock,
-        return_value=iter(
-            [
-                Link(f"{url}/demo-0.1.0.tar.gz"),
-                Link(f"{url}/demo-0.1.0_invalid.tar.gz"),
-                Link(f"{url}/invalid.tar.gz"),
-                Link(f"{url}/demo-0.1.0-py2.py3-none-any.whl"),
-                Link(f"{url}/demo-0.1.1.tar.gz"),
-            ]
-        ),
-    )
-    return link_source
+
+    class LinkSourceMock(LinkSource):
+        def _get_link_cache(
+            self,
+        ) -> defaultdict[NormalizedName, defaultdict[Version, list[Link]]]:
+            return defaultdict(
+                lambda: defaultdict(list),
+                {
+                    canonicalize_name("demo"): defaultdict(
+                        list,
+                        {
+                            Version.parse("0.1.0"): [
+                                Link(f"{url}/demo-0.1.0.tar.gz"),
+                                Link(f"{url}/demo-0.1.0-py2.py3-none-any.whl"),
+                            ],
+                            Version.parse("0.1.1"): [Link(f"{url}/demo-0.1.1.tar.gz")],
+                        },
+                    ),
+                    canonicalize_name(""): defaultdict(
+                        list,
+                        {
+                            Version.parse("0"): [
+                                Link(f"{url}/demo-0.1.0_invalid.tar.gz"),
+                                Link(f"{url}/invalid.tar.gz"),
+                            ]
+                        },
+                    ),
+                },
+            )
+
+    return LinkSourceMock(url)
 
 
 @pytest.mark.parametrize(