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Phase 3 PR 33 — DriverHostStatus entity + EF migration (data-layer for LMX #7). New DriverHostStatus entity with composite key (NodeId, DriverInstanceId, HostName) persists each server node's per-host connectivity view — one row per (server node, driver instance, probe-reported host), which means a redundant 2-node cluster with one Galaxy driver reporting 3 platforms produces 6 rows because each server node owns its own runtime view of the shared host topology, not 3. Fields: NodeId (64), DriverInstanceId (64), HostName (256 — fits Galaxy FQDNs and Modbus host:port strings), State (DriverHostState enum — Unknown/Running/Stopped/Faulted, persisted as nvarchar(16) via HasConversion<string> so DBAs inspecting the table see readable state names not ordinals), StateChangedUtc + LastSeenUtc (datetime2(3) — StateChangedUtc tracks actual transitions while LastSeenUtc advances on every publisher heartbeat so the Admin UI can flag stale rows from a crashed Server independent of State), Detail (nullable 1024 — exception message from the driver's probe when Faulted, null otherwise).

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DriverHostState enum lives in Configuration.Enums/ rather than reusing Core.Abstractions.HostState so the Configuration project stays free of driver-runtime dependencies (it's referenced by both the Admin process and the Server process, so pulling in the driver-abstractions assembly to every Admin build would be unnecessary weight). The server-side publisher hosted service (follow-up PR 34) will translate HostStatusChangedEventArgs.NewState to this enum on every transition.
No foreign key to ClusterNode — a Server may start reporting host status before its ClusterNode row exists (first-boot bootstrap), and we'd rather keep the status row than drop it. The Admin-side service that renders the dashboard will left-join on NodeId when presenting. Two indexes declared: IX_DriverHostStatus_Node drives the per-cluster drill-down (Admin UI joins ClusterNode on ClusterId to pick which NodeIds to fetch), IX_DriverHostStatus_LastSeen drives the stale-row query (now - LastSeen > threshold).
EF migration AddDriverHostStatus creates the table + PK + both indexes. Model snapshot updated. SchemaComplianceTests expected-tables list extended. DriverHostStatusTests (3 new cases, category SchemaCompliance, uses the shared fixture DB): composite key allows same (host, driver) across different nodes AND same (node, host) across different drivers — both real-world cases the publisher needs to support; upsert-in-place pattern (fetch-by-composite-PK, mutate, save) produces one row not two — the pattern the publisher will use; State enum persists as string not int — reading the DB via ADO.NET returns 'Faulted' not '3'.
Configuration.Tests SchemaCompliance suite: 10 pass / 0 fail (7 prior + 3 new). Configuration build clean. No Server or Admin code changes yet — publisher + /hosts page are PR 34.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
2026-04-18 15:38:41 -04:00
parent a9357600e7
commit 8464e3f376
8 changed files with 1576 additions and 0 deletions
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28
src/ZB.MOM.WW.OtOpcUa.Configuration/OtOpcUaConfigDbContext.cs
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@@ -27,6 +27,7 @@ public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbConte
public DbSet<ClusterNodeGenerationState> ClusterNodeGenerationStates => Set<ClusterNodeGenerationState>();
public DbSet<ConfigAuditLog> ConfigAuditLogs => Set<ConfigAuditLog>();
public DbSet<ExternalIdReservation> ExternalIdReservations => Set<ExternalIdReservation>();
public DbSet<DriverHostStatus> DriverHostStatuses => Set<DriverHostStatus>();
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
@@ -47,6 +48,7 @@ public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbConte
ConfigureClusterNodeGenerationState(modelBuilder);
ConfigureConfigAuditLog(modelBuilder);
ConfigureExternalIdReservation(modelBuilder);
ConfigureDriverHostStatus(modelBuilder);
}
private static void ConfigureServerCluster(ModelBuilder modelBuilder)
@@ -484,4 +486,30 @@ public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbConte
e.HasIndex(x => x.EquipmentUuid).HasDatabaseName("IX_ExternalIdReservation_Equipment");
});
}
private static void ConfigureDriverHostStatus(ModelBuilder modelBuilder)
{
modelBuilder.Entity<DriverHostStatus>(e =>
{
e.ToTable("DriverHostStatus");
// Composite key — one row per (server node, driver instance, probe-reported host).
// A redundant 2-node cluster with one Galaxy driver reporting 3 platforms produces
// 6 rows because each server node owns its own runtime view; the composite key is
// what lets both views coexist without shadowing each other.
e.HasKey(x => new { x.NodeId, x.DriverInstanceId, x.HostName });
e.Property(x => x.NodeId).HasMaxLength(64);
e.Property(x => x.DriverInstanceId).HasMaxLength(64);
e.Property(x => x.HostName).HasMaxLength(256);
e.Property(x => x.State).HasConversion<string>().HasMaxLength(16);
e.Property(x => x.StateChangedUtc).HasColumnType("datetime2(3)");
e.Property(x => x.LastSeenUtc).HasColumnType("datetime2(3)");
e.Property(x => x.Detail).HasMaxLength(1024);
// NodeId-only index drives the Admin UI's per-cluster drill-down (select all host
// statuses for the nodes of a specific cluster via join on ClusterNode.ClusterId).
e.HasIndex(x => x.NodeId).HasDatabaseName("IX_DriverHostStatus_Node");
// LastSeenUtc index powers the Admin UI's stale-row query (now - LastSeen > N).
e.HasIndex(x => x.LastSeenUtc).HasDatabaseName("IX_DriverHostStatus_LastSeen");
});
}
}