* feat: auto-disable master vacuum when plugin vacuum worker is active
When a vacuum-capable plugin worker connects to the admin server, the
admin server calls DisableVacuum on the master to prevent the automatic
scheduled vacuum from conflicting with the plugin worker's vacuum. When
the worker disconnects, EnableVacuum is called to restore the default
behavior. A safety net in the topology refresh loop re-enables vacuum
if the admin server disconnects without cleanup.
* rename isAdminServerConnected to isAdminServerConnectedFunc
* add 5s timeout to DisableVacuum/EnableVacuum gRPC calls
Prevents the monitor goroutine from blocking indefinitely if the
master is unresponsive.
* track plugin ownership of vacuum disable to avoid overriding operator
- Add vacuumDisabledByPlugin flag to Topology, set when DisableVacuum
is called while admin server is connected (i.e., by plugin monitor)
- Safety net only re-enables vacuum when it was disabled by plugin,
not when an operator intentionally disabled it via shell command
- EnableVacuum clears the plugin flag
* extract syncVacuumState for testability, add fake toggler tests
Extract the single sync step into syncVacuumState() with a
vacuumToggler interface. Add TestSyncVacuumState with a fake
toggler that verifies disable/enable calls on state transitions.
* use atomic.Bool for isDisableVacuum and vacuumDisabledByPlugin
Both fields are written by gRPC handlers and read by the vacuum
goroutine, causing a data race. Use atomic.Bool with Store/Load
for thread-safe access.
* use explicit by_plugin field instead of connection heuristic
Add by_plugin bool to DisableVacuumRequest proto so the caller
declares intent explicitly. The admin server monitor sets it to
true; shell commands leave it false. This prevents an operator's
intentional disable from being auto-reversed by the safety net.
* use setter for admin server callback instead of function parameter
Move isAdminServerConnected from StartRefreshWritableVolumes
parameter to Topology.SetAdminServerConnectedFunc() setter.
Keeps the function signature stable and decouples the topology
layer from the admin server concept.
* suppress repeated log messages on persistent sync failures
Add retrying parameter to syncVacuumState so the initial
state transition is logged at V(0) but subsequent retries
of the same transition are silent until the call succeeds.
* clear plugin ownership flag on manual DisableVacuum
Prevents stale plugin flag from causing incorrect auto-enable
when an operator manually disables vacuum after a plugin had
previously disabled it.
* add by_plugin to EnableVacuumRequest for symmetric ownership tracking
Plugin-driven EnableVacuum now only re-enables if the plugin was
the one that disabled it. If an operator manually disabled vacuum
after the plugin, the plugin's EnableVacuum is a no-op. This
prevents the plugin monitor from overriding operator intent on
worker disconnect.
* use cancellable context for monitorVacuumWorker goroutine
Replace context.Background() with a cancellable context stored
as bgCancel on AdminServer. Shutdown() calls bgCancel() so
monitorVacuumWorker exits cleanly via ctx.Done().
* track operator and plugin vacuum disables independently
Replace single isDisableVacuum flag with two independent flags:
vacuumDisabledByOperator and vacuumDisabledByPlugin. Each caller
only flips its own flag. The effective disabled state is the OR
of both. This prevents a plugin connect/disconnect cycle from
overriding an operator's manual disable, and vice versa.
* fix safety net to clear plugin flag, not operator flag
The safety net should call EnableVacuumByPlugin() to clear only
the plugin disable flag when the admin server disconnects. The
previous call to EnableVacuum() incorrectly cleared the operator
flag instead.
