bito-code-review[bot] commented on code in PR #40084:
URL: https://github.com/apache/superset/pull/40084#discussion_r3263875823
##########
superset/extensions/local_extensions_watcher.py:
##########
@@ -29,37 +29,113 @@
logger = logging.getLogger(__name__)
+# Sentinel file Flask watches via --extra-files. Touching it on a real change
+# triggers a server reload without depending on cwd or the location of any
+# Python source file.
+RELOAD_TRIGGER = Path(__file__).resolve().parent / ".reload_trigger"
+
# Guard to prevent multiple initializations
_watcher_initialized = False
_watcher_lock = threading.Lock()
-def _get_file_handler_class() -> Any:
+def _get_file_handler_class() -> Any: # noqa: C901
"""Get the file handler class, importing watchdog only when needed."""
try:
- from watchdog.events import FileSystemEventHandler
+ import hashlib
+
+ from watchdog.events import (
+ FileCreatedEvent,
+ FileModifiedEvent,
+ FileMovedEvent,
+ FileSystemEventHandler,
+ )
class LocalExtensionFileHandler(FileSystemEventHandler):
- """Custom file system event handler for LOCAL_EXTENSIONS
directories."""
+ """Custom file system event handler for LOCAL_EXTENSIONS
directories.
+
+ Only reacts to genuine content changes (create / modify / move) in
the
+ dist directory, verified by comparing a SHA-256 of the file's
content.
+ This avoids the Docker VirtioFS / osxfs problem where reading a
file
+ generates inotify events that watchdog surfaces as modifications.
+ """
+
+ def __init__(self) -> None:
+ super().__init__()
+ # sha256 of last-seen content, keyed by absolute path
+ self._file_hashes: dict[str, str] = {}
+ # Deduplicate: only trigger once per second across all files
+ self._last_trigger: float = 0.0
+ self._lock = threading.Lock()
+
+ # ── helpers ──────────────────────────────────────────────────────
+
+ @staticmethod
+ def _sha256(path: str) -> str | None:
+ try:
+ with open(path, "rb") as fh:
+ return hashlib.sha256(fh.read()).hexdigest()
+ except OSError:
+ return None
+
+ def _content_changed(self, path: str) -> bool:
+ """Return True only when the file's content differs from last
seen.
+
+ The first time a path is observed its hash is stored as the
baseline
+ and False is returned — that event is a 'first-seen', not a
change.
+ Only a subsequent event where the digest differs from the
baseline
+ is treated as a genuine content change.
+ """
+ digest = self._sha256(path)
+ if digest is None:
+ return False
+ old_digest = self._file_hashes.get(path)
+ self._file_hashes[path] = digest
+ if old_digest is None:
+ # First observation — record baseline, do not trigger
restart.
+ return False
+ return old_digest != digest
+
+ # ── event handler
─────────────────────────────────────────────────
def on_any_event(self, event: Any) -> None:
- """Handle any file system event in the watched directories."""
+ """Handle file system events in the watched directories."""
if event.is_directory:
return
- # Only trigger on changes to files in `dist` directory
+ # Only react to true write events; skip access / close / open
etc.
+ if not isinstance(
+ event, (FileCreatedEvent, FileModifiedEvent,
FileMovedEvent)
+ ):
+ return
+
+ # Only care about files inside a `dist` directory
src = getattr(event, "src_path", None)
if not isinstance(src, str) or "dist" not in Path(src).parts:
return
+ # Verify the file content actually changed to ignore spurious
+ # inotify events generated by Docker bind-mount reads.
+ if not self._content_changed(src):
+ return
+
+ # Debounce: one restart per second max, regardless of how many
+ # files webpack writes simultaneously.
+ now = time.monotonic()
+ with self._lock:
+ if now - self._last_trigger < 1.0:
+ return
+ self._last_trigger = now
+
logger.info(
"File change detected in LOCAL_EXTENSIONS: %s",
event.src_path
)
- # Touch superset/__init__.py to trigger Flask's file watcher
- superset_init = Path("superset/__init__.py")
- logger.info("Triggering restart by touching %s", superset_init)
- os.utime(superset_init, (time.time(), time.time()))
+ # Touch the dedicated reload-trigger sentinel file.
+ # Flask watches this via --extra-files; it is never read by
Python
+ # so Docker VirtioFS will not generate spurious inotify events
on it.
+ logger.info("Triggering restart by touching %s",
RELOAD_TRIGGER)
+ os.utime(RELOAD_TRIGGER, (time.time(), time.time()))
Review Comment:
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