test re up wathcers state

backend/src/config.py

@@ -54,6 +54,7 @@ class BackendSettings:
     bridge_bpf_build_dir: str
     bridge_link_state_poll_interval_seconds: float
     bridge_link_state_thread_join_timeout_seconds: float
+    bridge_link_state_recovery_holdoff_seconds: float
     telemetry_process_stop_timeout_seconds: float
     telemetry_reader_join_timeout_seconds: float
     tshark_enabled: bool
@@ -96,6 +97,10 @@ def load_settings() -> BackendSettings:
             "BACKEND_BRIDGE_LINK_STATE_THREAD_JOIN_TIMEOUT_SECONDS",
             2.0,
         ),
+        bridge_link_state_recovery_holdoff_seconds=_env_float(
+            "BACKEND_BRIDGE_LINK_STATE_RECOVERY_HOLDOFF_SECONDS",
+            1.0,
+        ),
         telemetry_process_stop_timeout_seconds=_env_float("BACKEND_TELEMETRY_PROCESS_STOP_TIMEOUT_SECONDS", 3.0),
         telemetry_reader_join_timeout_seconds=_env_float("BACKEND_TELEMETRY_READER_JOIN_TIMEOUT_SECONDS", 2.0),
         tshark_enabled=_env_bool("BACKEND_TSHARK_ENABLED", True),

backend/src/utilities/bridge_link_state_manager.py

@@ -69,6 +69,8 @@ class BridgeLinkStateWatcher:
         )
         self._running = False
         self._suppressed_members: dict[str, bool] = {}
+        self._settle_deadlines: dict[str, float] = {}
+        self._all_clear_since: Optional[float] = None
         self._last_poll_ts: Optional[float] = None
         self._last_error: Optional[str] = None
         self._last_action: Optional[str] = None
@@ -111,6 +113,7 @@ class BridgeLinkStateWatcher:
                 "last_error": self._last_error,
                 "last_action": self._last_action,
                 "suppressed_members": sorted(self._suppressed_members),
+                "recovery_holdoff_seconds": settings.bridge_link_state_recovery_holdoff_seconds,
                 "members": members,
             }
 
@@ -139,22 +142,55 @@ class BridgeLinkStateWatcher:
                 for iface, restore_up in self._suppressed_members.items()
                 if iface in states
             }
+            self._settle_deadlines = {
+                iface: deadline
+                for iface, deadline in self._settle_deadlines.items()
+                if iface in states and deadline > now
+            }
 
         if len(states) < 2:
+            self._all_clear_since = None
             self._restore_suppressed_members(reason="bridge_has_fewer_than_two_members")
             return
 
+        with self._lock:
             suppressed_snapshot = set(self._suppressed_members)
+            settling_snapshot = {
+                iface for iface, deadline in self._settle_deadlines.items() if deadline > now
+            }
+
         failing_members = sorted(
             ifname
             for ifname, state in states.items()
-            if ifname not in suppressed_snapshot and not state.link_ready
+            if ifname not in suppressed_snapshot and ifname not in settling_snapshot and not state.link_ready
         )
 
         if failing_members:
+            with self._lock:
+                self._all_clear_since = None
             self._suppress_other_members(states, failing_members)
             return
 
+        if suppressed_snapshot:
+            should_restore = False
+            with self._lock:
+                if self._all_clear_since is None:
+                    self._all_clear_since = now
+                should_restore = now - self._all_clear_since >= settings.bridge_link_state_recovery_holdoff_seconds
+                if not should_restore:
+                    remaining = max(
+                        0.0,
+                        settings.bridge_link_state_recovery_holdoff_seconds - (now - self._all_clear_since),
+                    )
+                    self._last_action = f"waiting {remaining:.2f}s before restoring suppressed members"
+
+            if should_restore:
+                self._restore_suppressed_members(reason="all_members_recovered")
+            return
+
+        with self._lock:
+            self._all_clear_since = None
+
         self._restore_suppressed_members(reason="all_members_recovered")
 
     def _read_member_state(self, ifname: str) -> MemberLinkState:
@@ -209,6 +245,7 @@ class BridgeLinkStateWatcher:
 
         with self._lock:
             self._suppressed_members = {}
+            self._all_clear_since = None
             self._last_action = f"restored {restored_members} ({reason})"
 
     def _set_interface_admin_state(self, ifname: str, target_up: bool) -> None:
@@ -222,6 +259,10 @@ class BridgeLinkStateWatcher:
                 raise RuntimeError(f"Interface {ifname} not found while propagating link state")
             ipr.link("set", index=indices[0], state=state_name)
 
+        if target_up:
+            with self._lock:
+                self._settle_deadlines[ifname] = time.time() + settings.bridge_link_state_recovery_holdoff_seconds
+
 
 class BridgeLinkStateManager:
     """Track bridge link-state watchers keyed by bridge name."""