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fix(drivers): InitializeAsync releases previous device/session state before overwrite (#630)

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FOCAS, AbLegacy, AbCip, TwinCAT, S7 and OpcUaClient orphaned the previous
probe/recycle/fixed-tree loops and clients when re-initialised on a live driver.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
This commit is contained in:
Joseph Doherty
2026-10-08 14:28:55 -04:00
parent d898262c4a
commit 461133235a
13 changed files with 494 additions and 36 deletions
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src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient/OpcUaClientDriver.cs
+40 -25
View File
@@ -194,6 +194,10 @@ public sealed class OpcUaClientDriver : IDriver, ITagDiscovery, IReadable, IWrit
/// <inheritdoc />
public async Task InitializeAsync(string driverConfigJson, CancellationToken cancellationToken)
{
// #630: InitializeAsync is reachable on a live driver (DriverInstanceActor.AdoptConfigDuringInit runs
// it with no teardown first); `Session = session` below would otherwise orphan the previous session,
// its keep-alive handler and any reconnect handler.
await ReleaseSessionAsync(cancellationToken).ConfigureAwait(false);
_health = new DriverHealth(DriverState.Initializing, null, null);
try
{
@@ -587,32 +591,14 @@ public sealed class OpcUaClientDriver : IDriver, ITagDiscovery, IReadable, IWrit
await InitializeAsync(driverConfigJson, cancellationToken).ConfigureAwait(false);
}
/// <inheritdoc />
public async Task ShutdownAsync(CancellationToken cancellationToken)
/// <summary>
/// Cancels any in-flight reconnect, detaches the keep-alive handler and closes + disposes the current
/// session. The session part of <see cref="ShutdownAsync"/>; also run at the top of
/// <see cref="InitializeAsync"/> so a re-initialise on a live driver (#630) does not orphan the
/// previous session and its reconnect handler. Subscriptions are NOT touched here.
/// </summary>
private async Task ReleaseSessionAsync(CancellationToken cancellationToken)
{
// Tear down remote subscriptions first — otherwise Session.Close will try and may fail
// with BadSubscriptionIdInvalid noise in the upstream log. _subscriptions is cleared
// whether or not the wire-side delete succeeds since the local handles are useless
// after close anyway. Before deleting each subscription we detach the Notification
// handlers we attached at subscribe time so the SDK's invocation list no longer
// holds the driver instance through the closure.
foreach (var rs in _subscriptions.Values)
{
DetachNotificationHandlers(rs.ItemHandlers);
try { await rs.Subscription.DeleteAsync(silent: true, cancellationToken).ConfigureAwait(false); }
catch { /* best-effort */ }
}
_subscriptions.Clear();
foreach (var ras in _alarmSubscriptions.Values)
{
try { ras.EventItem.Notification -= ras.Handler; }
catch { /* best-effort */ }
try { await ras.Subscription.DeleteAsync(silent: true, cancellationToken).ConfigureAwait(false); }
catch { /* best-effort */ }
}
_alarmSubscriptions.Clear();
// Abort any in-flight reconnect attempts before touching the session — BeginReconnect's
// retry loop holds a reference to the current session and would fight Session.CloseAsync
// if left spinning. Take the handler under _probeLock so a keep-alive callback racing
@@ -645,6 +631,35 @@ public sealed class OpcUaClientDriver : IDriver, ITagDiscovery, IReadable, IWrit
try { if (sessionToClose is Session s) await s.CloseAsync(cancellationToken).ConfigureAwait(false); }
catch { /* best-effort */ }
try { sessionToClose?.Dispose(); } catch { }
}
/// <inheritdoc />
public async Task ShutdownAsync(CancellationToken cancellationToken)
{
// Tear down remote subscriptions first — otherwise Session.Close will try and may fail
// with BadSubscriptionIdInvalid noise in the upstream log. _subscriptions is cleared
// whether or not the wire-side delete succeeds since the local handles are useless
// after close anyway. Before deleting each subscription we detach the Notification
// handlers we attached at subscribe time so the SDK's invocation list no longer
// holds the driver instance through the closure.
foreach (var rs in _subscriptions.Values)
{
DetachNotificationHandlers(rs.ItemHandlers);
try { await rs.Subscription.DeleteAsync(silent: true, cancellationToken).ConfigureAwait(false); }
catch { /* best-effort */ }
}
_subscriptions.Clear();
foreach (var ras in _alarmSubscriptions.Values)
{
try { ras.EventItem.Notification -= ras.Handler; }
catch { /* best-effort */ }
try { await ras.Subscription.DeleteAsync(silent: true, cancellationToken).ConfigureAwait(false); }
catch { /* best-effort */ }
}
_alarmSubscriptions.Clear();
await ReleaseSessionAsync(cancellationToken).ConfigureAwait(false);
_namespaceMap = null;
_connectedEndpointUrl = null;