8460: Tolerate None where dicts are expected in events.

[arvados.git] / services / fuse / arvados_fuse / __init__.py

diff --git a/services/fuse/arvados_fuse/__init__.py b/services/fuse/arvados_fuse/__init__.py
index f32a5db3cc29e63d7b556adfa19d011f89ccd713..51b0a57a7fe11e573361e242eb80d324a540dfda 100644 (file)
--- a/services/fuse/arvados_fuse/__init__.py
+++ b/services/fuse/arvados_fuse/__init__.py
@@ -367,45 +367,38 @@ class Operations(llfuse.Operations):
         return True
 
     def listen_for_events(self):
-        self.events = arvados.events.subscribe(self._api_client,
-                                 [["event_type", "in", ["create", "update", "delete"]]],
-                                 self.on_event)
+        self.events = arvados.events.subscribe(
+            self._api_client,
+            [["event_type", "in", ["create", "update", "delete"]]],
+            self.on_event)
 
     @catch_exceptions
     def on_event(self, ev):
         if 'event_type' not in ev:
             return
         with llfuse.lock:
+            new_attrs = (ev.get("properties") or {}).get("new_attributes") or {}
+            pdh = new_attrs.get("portable_data_hash")
+            # new_attributes.modified_at currently lacks
+            # subsecond precision (see #6347) so use event_at
+            # which should always be the same.
+            stamp = ev.get("event_at")
+
             for item in self.inodes.inode_cache.find_by_uuid(ev["object_uuid"]):
                 item.invalidate()
-                if ev["object_kind"] == "arvados#collection":
-                    new_attr = (ev.get("properties") and
-                                ev["properties"].get("new_attributes") and
-                                ev["properties"]["new_attributes"])
-
-                    # new_attributes.modified_at currently lacks
-                    # subsecond precision (see #6347) so use event_at
-                    # which should always be the same.
-                    record_version = (
-                        (ev["event_at"], new_attr["portable_data_hash"])
-                        if new_attr else None)
-
-                    item.update(to_record_version=record_version)
+                if stamp and pdh and ev.get("object_kind") == "arvados#collection":
+                    item.update(to_record_version=(stamp, pdh))
                 else:
                     item.update()
 
-            oldowner = (
-                ev.get("properties") and
-                ev["properties"].get("old_attributes") and
-                ev["properties"]["old_attributes"].get("owner_uuid"))
-            newowner = ev["object_owner_uuid"]
+            oldowner = ((ev.get("properties") or {}).get("old_attributes") or {}).get("owner_uuid")
+            newowner = ev.get("object_owner_uuid")
             for parent in (
                     self.inodes.inode_cache.find_by_uuid(oldowner) +
                     self.inodes.inode_cache.find_by_uuid(newowner)):
                 parent.invalidate()
                 parent.update()
 
-
     @catch_exceptions
     def getattr(self, inode):
         if inode not in self.inodes: