Optimize replication failure caching, batch UI auth checks, add bulk download size limit, background parent cleanup

app/iam.py

@@ -309,6 +309,18 @@ class IamService:
         if not self._is_allowed(principal, normalized, action):
             raise IamError(f"Access denied for action '{action}' on bucket '{bucket_name}'")
 
+    def check_permissions(self, principal: Principal, bucket_name: str | None, actions: Iterable[str]) -> Dict[str, bool]:
+        self._maybe_reload()
+        bucket_name = (bucket_name or "*").lower() if bucket_name != "*" else (bucket_name or "*")
+        normalized_actions = {a: self._normalize_action(a) for a in actions}
+        results: Dict[str, bool] = {}
+        for original, canonical in normalized_actions.items():
+            if canonical not in ALLOWED_ACTIONS:
+                results[original] = False
+            else:
+                results[original] = self._is_allowed(principal, bucket_name, canonical)
+        return results
+
     def buckets_for_principal(self, principal: Principal, buckets: Iterable[str]) -> List[str]:
         return [bucket for bucket in buckets if self._is_allowed(principal, bucket, "list")]
 

app/replication.py

@@ -176,11 +176,12 @@ class ReplicationFailureStore:
         self.storage_root = storage_root
         self.max_failures_per_bucket = max_failures_per_bucket
         self._lock = threading.Lock()
+        self._cache: Dict[str, List[ReplicationFailure]] = {}
 
     def _get_failures_path(self, bucket_name: str) -> Path:
         return self.storage_root / ".myfsio.sys" / "buckets" / bucket_name / "replication_failures.json"
 
-    def load_failures(self, bucket_name: str) -> List[ReplicationFailure]:
+    def _load_from_disk(self, bucket_name: str) -> List[ReplicationFailure]:
         path = self._get_failures_path(bucket_name)
         if not path.exists():
             return []
@@ -192,7 +193,7 @@ class ReplicationFailureStore:
             logger.error(f"Failed to load replication failures for {bucket_name}: {e}")
             return []
 
-    def save_failures(self, bucket_name: str, failures: List[ReplicationFailure]) -> None:
+    def _save_to_disk(self, bucket_name: str, failures: List[ReplicationFailure]) -> None:
         path = self._get_failures_path(bucket_name)
         path.parent.mkdir(parents=True, exist_ok=True)
         data = {"failures": [f.to_dict() for f in failures[:self.max_failures_per_bucket]]}
@@ -202,6 +203,18 @@ class ReplicationFailureStore:
         except OSError as e:
             logger.error(f"Failed to save replication failures for {bucket_name}: {e}")
 
+    def load_failures(self, bucket_name: str) -> List[ReplicationFailure]:
+        if bucket_name in self._cache:
+            return list(self._cache[bucket_name])
+        failures = self._load_from_disk(bucket_name)
+        self._cache[bucket_name] = failures
+        return list(failures)
+
+    def save_failures(self, bucket_name: str, failures: List[ReplicationFailure]) -> None:
+        trimmed = failures[:self.max_failures_per_bucket]
+        self._cache[bucket_name] = trimmed
+        self._save_to_disk(bucket_name, trimmed)
+
     def add_failure(self, bucket_name: str, failure: ReplicationFailure) -> None:
         with self._lock:
             failures = self.load_failures(bucket_name)
@@ -227,6 +240,7 @@ class ReplicationFailureStore:
 
     def clear_failures(self, bucket_name: str) -> None:
         with self._lock:
+            self._cache.pop(bucket_name, None)
             path = self._get_failures_path(bucket_name)
             if path.exists():
                 path.unlink()

app/storage.py

@@ -11,6 +11,7 @@ import time
 import unicodedata
 import uuid
 from collections import OrderedDict
+from concurrent.futures import ThreadPoolExecutor
 from contextlib import contextmanager
 from dataclasses import dataclass
 from datetime import datetime, timezone
@@ -187,6 +188,7 @@ class ObjectStorage:
         self._object_cache_max_size = object_cache_max_size
         self._object_key_max_length_bytes = object_key_max_length_bytes
         self._sorted_key_cache: Dict[str, tuple[list[str], int]] = {}
+        self._cleanup_executor = ThreadPoolExecutor(max_workers=1, thread_name_prefix="ParentCleanup")
 
     def _get_bucket_lock(self, bucket_id: str) -> threading.Lock:
         """Get or create a lock for a specific bucket. Reduces global lock contention."""
@@ -544,11 +546,14 @@ class ObjectStorage:
         return self._read_metadata(bucket_path.name, safe_key) or {}
 
     def _cleanup_empty_parents(self, path: Path, stop_at: Path) -> None:
-        """Remove empty parent directories up to (but not including) stop_at.
+        """Remove empty parent directories in a background thread.
 
         On Windows/OneDrive, directories may be locked briefly after file deletion.
-        This method retries with a small delay to handle that case.
+        Running this in the background avoids blocking the request thread with retries.
         """
+        self._cleanup_executor.submit(self._do_cleanup_empty_parents, path, stop_at)
+
+    def _do_cleanup_empty_parents(self, path: Path, stop_at: Path) -> None:
         for parent in path.parents:
             if parent == stop_at:
                 break

app/ui.py

@@ -423,57 +423,25 @@ def bucket_detail(bucket_name: str):
         },
         indent=2,
     )
-    can_edit_policy = False
+    iam = _iam()
-    if principal:
+    bucket_perms = iam.check_permissions(
-        try:
+        principal, bucket_name, ["policy", "lifecycle", "cors", "write", "replication"],
-            _iam().authorize(principal, bucket_name, "policy")
+    ) if principal else {}
-            can_edit_policy = True
+    admin_perms = iam.check_permissions(
-        except IamError:
+        principal, None, ["iam:list_users"],
-            can_edit_policy = False
+    ) if principal else {}
 
-    can_manage_lifecycle = False
+    can_edit_policy = bucket_perms.get("policy", False)
-    if principal:
+    can_manage_lifecycle = bucket_perms.get("lifecycle", False)
-        try:
+    can_manage_cors = bucket_perms.get("cors", False)
-            _iam().authorize(principal, bucket_name, "lifecycle")
+    can_manage_versioning = bucket_perms.get("write", False)
-            can_manage_lifecycle = True
+    can_manage_replication = bucket_perms.get("replication", False)
-        except IamError:
+    is_replication_admin = admin_perms.get("iam:list_users", False)
-            can_manage_lifecycle = False
-
-    can_manage_cors = False
-    if principal:
-        try:
-            _iam().authorize(principal, bucket_name, "cors")
-            can_manage_cors = True
-        except IamError:
-            can_manage_cors = False
 
     try:
         versioning_enabled = storage.is_versioning_enabled(bucket_name)
     except StorageError:
         versioning_enabled = False
-    can_manage_versioning = False
-    if principal:
-        try:
-            _iam().authorize(principal, bucket_name, "write")
-            can_manage_versioning = True
-        except IamError:
-            can_manage_versioning = False
-
-    can_manage_replication = False
-    if principal:
-        try:
-            _iam().authorize(principal, bucket_name, "replication")
-            can_manage_replication = True
-        except IamError:
-            can_manage_replication = False
-
-    is_replication_admin = False
-    if principal:
-        try:
-            _iam().authorize(principal, None, "iam:list_users")
-            is_replication_admin = True
-        except IamError:
-            is_replication_admin = False
 
     replication_rule = _replication().get_rule(bucket_name)
     connections = _connections().list() if (is_replication_admin or replication_rule) else []
@@ -489,12 +457,7 @@ def bucket_detail(bucket_name: str):
 
     bucket_quota = storage.get_bucket_quota(bucket_name)
     bucket_stats = storage.bucket_stats(bucket_name)
-    can_manage_quota = False
+    can_manage_quota = is_replication_admin
-    try:
-        _iam().authorize(principal, None, "iam:list_users")
-        can_manage_quota = True
-    except IamError:
-        pass
 
     objects_api_url = url_for("ui.list_bucket_objects", bucket_name=bucket_name)
     objects_stream_url = url_for("ui.stream_bucket_objects", bucket_name=bucket_name)
@@ -1009,6 +972,18 @@ def bulk_download_objects(bucket_name: str):
     except IamError as exc:
         return jsonify({"error": str(exc)}), 403
 
+    max_total_bytes = current_app.config.get("BULK_DOWNLOAD_MAX_BYTES", 1024 * 1024 * 1024)
+    total_size = 0
+    for key in unique_keys:
+        try:
+            path = storage.get_object_path(bucket_name, key)
+            total_size += path.stat().st_size
+        except (StorageError, OSError):
+            continue
+    if total_size > max_total_bytes:
+        limit_mb = max_total_bytes // (1024 * 1024)
+        return jsonify({"error": f"Total download size exceeds {limit_mb} MB limit. Select fewer objects."}), 400
+
     buffer = io.BytesIO()
     with zipfile.ZipFile(buffer, "w", zipfile.ZIP_DEFLATED) as zf:
         for key in unique_keys: