ID

22f5874

date

2026-11-06 22:40:02+00:00

author

Alex Chan <alexc@tailscale.com>

parent

954bbfb

message

manager: warn if we can't determine the source file of a function

changed files

2 files, 7 additions, 1 deletion

• src/funkycache/manager.py
• tests/test_manager.py

Changed files

src/funkycache/manager.py (10189 → 10346)

diff --git a/src/funkycache/manager.py b/src/funkycache/manager.py
index c4570fc..acf015c 100644
--- a/src/funkycache/manager.py
+++ b/src/funkycache/manager.py
@@ -276,6 +276,11 @@ def _dep_paths(func: F, files: list[Path]) -> set[Path]:
     # 1. Include the source file of the function.
     if func_file := inspect.getsourcefile(func):
         dep_paths.append(Path(func_file))
+    else:
+        warnings.warn(
+            f"unable to determine source file for {func}; "
+            "caches may not be invalidated correctly"
+        )
 
     # 2. Include any explicitly declared files.
     if files:

tests/test_manager.py (13569 → 13658)

diff --git a/tests/test_manager.py b/tests/test_manager.py
index 5492263..9b73f20 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -257,7 +257,8 @@ class FunkyCacheTestSuite(ABC):
 
         assert inspect.getsourcefile(double) is None
 
-        cache.register(double)
+        with pytest.warns(UserWarning, match="unable to determine source file for"):
+            cache.register(double)
 
     def test_function_cannot_depend_on_symlink(
         self, cache: FunkyCache, tmp_path: Path