gh-116811: Ensure MetadataPathFinder.invalidate_caches is reachable when delegated through PathFinder. (#116812)

jaraco · web-flow · commit 5f52d20a9390 · 2024-03-14T17:59:00.000-04:00
* Make MetadataPathFinder a proper classmethod.

* In PathFinder.invalidate_caches, also invoke MetadataPathFinder.invalidate_caches.

* Add blurb
diff --git a/Lib/importlib/_bootstrap_external.py b/Lib/importlib/_bootstrap_external.py
@@ -1470,6 +1470,9 @@ def invalidate_caches():
         # https://bugs.python.org/issue45703
         _NamespacePath._epoch += 1
 
+        from importlib.metadata import MetadataPathFinder
+        MetadataPathFinder.invalidate_caches()
+
     @staticmethod
     def _path_hooks(path):
         """Search sys.path_hooks for a finder for 'path'."""
diff --git a/Lib/importlib/metadata/__init__.py b/Lib/importlib/metadata/__init__.py
@@ -797,6 +797,7 @@ def _search_paths(cls, name, paths):
             path.search(prepared) for path in map(FastPath, paths)
         )
 
+    @classmethod
     def invalidate_caches(cls) -> None:
         FastPath.__new__.cache_clear()
 
diff --git a/Misc/NEWS.d/next/Library/2024-03-14-10-01-23.gh-issue-116811._h5iKP.rst b/Misc/NEWS.d/next/Library/2024-03-14-10-01-23.gh-issue-116811._h5iKP.rst
@@ -0,0 +1,2 @@
+In ``PathFinder.invalidate_caches``, delegate to
+``MetadataPathFinder.invalidate_caches``.

Original file line number	Diff line number	Diff line change
`@@ -797,6 +797,7 @@ def _search_paths(cls, name, paths):`
`797`	`797`	`path.search(prepared) for path in map(FastPath, paths)`
`798`	`798`	`)`
`799`	`799`
	`800`	`+ @classmethod`
`800`	`801`	`def invalidate_caches(cls) -> None:`
`801`	`802`	`FastPath.__new__.cache_clear()`
`802`	`803`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+In ``PathFinder.invalidate_caches``, delegate to
	`2`	+``MetadataPathFinder.invalidate_caches``.