feat(hosts): surface per-host connectivity on /hosts; drop the unwritable table (#521)
`IHostConnectivityProbe` was a dead surface: eleven drivers implement it, `GetHostStatuses()` had ZERO production call sites, and `OnHostStatusChanged` had no subscriber outside the Galaxy driver's own aggregator. Per-host connectivity was computed by every driver and read by nobody. The issue offered "build the publisher or delete it". The publisher as its entity doc described it — driver nodes upserting `DriverHostStatus` rows — is not buildable: per-cluster mesh Phase 4 gates `AddOtOpcUaConfigDb` on the `admin` role, so a driver-only node has no ConfigDb connection to write rows with. So the capability is kept and the transport changed. `DriverHealthChanged.HostStatuses` now carries the probe result to `/hosts` as a Hosts column. That channel already reached the page, already survives the mesh split via the Phase 5 gRPC telemetry stream, and already replays a last-value snapshot on re-subscribe — so per-host state re-primes after a reconnect without a durable store. Both halves of the interface finally do what they are for: the event triggers a prompt publish, the pull is the source of truth. The point of the column is the case the driver-level state chip structurally cannot express: a multi-device driver stays aggregate-Healthy while ONE of its devices is unreachable. Two traps, both pinned by tests that were falsified against the prod code: - The host digest MUST be in the publish fingerprint. On a single-host-down transition every other fingerprint component is unchanged, so the dedup would swallow exactly the publish carrying the news — the trap that already bit the rediscovery signal. Removing it turns the guard test red, verified. - null (no probe) must stay distinct from empty (probe with no hosts). proto3 cannot tell an absent repeated field from an empty one, hence the explicit `has_host_statuses` flag; collapsing them would render every probe-less driver as one whose devices are all fine. Dropped: the DriverHostStatus entity, enum, DbSet, model config and table (migration DropDriverHostStatusTable — empty on every deployment, so the scaffolder's data-loss warning is moot, and Down() recreates it exactly). Found en route, NOT fixed here: `DriverInstanceResilienceStatus` is the identical defect — no writer, no reader, only a DbSet declaration, while the live data rides the `driver-resilience-status` telemetry channel. Its doc-comment now states that rather than describing the sampler and AdminUI join that were never built. Filed as #524 rather than widening this schema change beyond what was asked. Claude-Session: https://claude.ai/code/session_015p7wGqy3YpZNCpDzTpGMKo
This commit is contained in:
Joseph Doherty
@@ -1,3 +1,5 @@
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using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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namespace ZB.MOM.WW.OtOpcUa.Commons.Messages.Drivers;
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/// <summary>
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@@ -26,6 +28,22 @@ namespace ZB.MOM.WW.OtOpcUa.Commons.Messages.Drivers;
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/// The driver-supplied reason string from the same event (e.g. <c>"deploy-time-changed"</c>), shown
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/// to the operator alongside the prompt. Null when <paramref name="RediscoveryNeededUtc"/> is null.
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/// </param>
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/// <param name="HostStatuses">
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/// Per-host connectivity as reported by <c>IHostConnectivityProbe.GetHostStatuses()</c>, or null when
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/// the driver does not implement that capability. Empty (not null) when it does but knows no hosts yet.
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/// <para><b>Why this rides the health snapshot rather than a table.</b> The <c>DriverHostStatus</c>
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/// entity used to own this, with a doc-comment describing a publisher hosted service that upserted rows
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/// from each driver node. That publisher was never built, and since per-cluster mesh Phase 4 it is
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/// unbuildable as described: <c>Program.cs</c> gates <c>AddOtOpcUaConfigDb</c> on the <c>admin</c> role,
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/// so a driver-only node has no ConfigDb connection to write rows to. This channel already reaches
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/// <c>/hosts</c>, already survives the mesh split via the Phase 5 gRPC telemetry stream, and already
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/// replays a last-value snapshot on every (re)subscribe — so per-host state re-primes after a
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/// reconnect without a durable store. The table was dropped; see Gitea #521.</para>
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/// <para><b>Value-equality caveat.</b> A record's generated <c>Equals</c> compares this list by
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/// REFERENCE, so two <c>DriverHealthChanged</c> carrying equal-but-distinct lists are not equal.
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/// Nothing dedups on record equality — <c>DriverInstanceActor</c> keeps its own flattened fingerprint
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/// precisely because of this — but do not introduce such a comparison without fixing it here first.</para>
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/// </param>
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public sealed record DriverHealthChanged(
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string ClusterId,
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string DriverInstanceId,
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@@ -35,7 +53,8 @@ public sealed record DriverHealthChanged(
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int ErrorCount5Min,
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DateTime PublishedUtc,
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DateTime? RediscoveryNeededUtc = null,
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string? RediscoveryReason = null)
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string? RediscoveryReason = null,
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IReadOnlyList<HostConnectivityStatus>? HostStatuses = null)
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{
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/// <summary>
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/// DPS topic name. Both the runtime <c>AkkaDriverHealthPublisher</c> and the AdminUI
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@@ -70,6 +70,19 @@ message DriverHealth {
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google.protobuf.Timestamp published_utc = 7;
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google.protobuf.Timestamp rediscovery_needed_utc = 8; // DateTime? — absent Timestamp encodes null
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optional string rediscovery_reason = 9; // nullable in the record
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// Per-host connectivity (Gitea #521). proto3 cannot distinguish an absent repeated field from an
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// empty one, and the two mean different things here — "driver is not an IHostConnectivityProbe" vs
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// "it is one and currently knows no hosts" — so the presence flag carries that bit explicitly rather
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// than letting an empty list silently claim the driver has no probe.
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bool has_host_statuses = 10;
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repeated HostConnectivity host_statuses = 11;
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}
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// Mirrors ZB.MOM.WW.OtOpcUa.Core.Abstractions.HostConnectivityStatus.
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message HostConnectivity {
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string host_name = 1;
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string state = 2; // HostState-as-string, matching DriverHealth.state
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google.protobuf.Timestamp last_changed_utc = 3;
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}
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// Mirrors ZB.MOM.WW.OtOpcUa.Commons.Messages.Drivers.DriverResilienceStatusChanged.
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@@ -1,62 +0,0 @@
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using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
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namespace ZB.MOM.WW.OtOpcUa.Configuration.Entities;
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/// <summary>
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/// Per-host connectivity snapshot the Server publishes for each driver's
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/// <c>IHostConnectivityProbe.GetHostStatuses</c> entry. One row per
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/// (<see cref="NodeId"/>, <see cref="DriverInstanceId"/>, <see cref="HostName"/>) triple —
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/// a redundant 2-node cluster with one Galaxy driver reporting 3 platforms produces 6
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/// rows, not 3, because each server node owns its own runtime view.
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/// </summary>
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/// <remarks>
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/// <para>
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/// Supports the per-AppEngine Admin dashboard drill-down. The publisher hosted
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/// service on the Server side subscribes to every
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/// registered driver's <c>OnHostStatusChanged</c> and upserts rows on transitions +
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/// periodic liveness heartbeats. <see cref="LastSeenUtc"/> advances on every
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/// heartbeat so the Admin UI can flag stale rows from a crashed Server.
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/// </para>
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/// <para>
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/// No foreign-key to <see cref="ClusterNode"/> — a Server may start reporting host
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/// status before its ClusterNode row exists (e.g. first-boot bootstrap), and we'd
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/// rather keep the status row than drop it. The Admin-side service left-joins on
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/// NodeId when presenting rows.
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/// </para>
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/// </remarks>
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public sealed class DriverHostStatus
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{
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/// <summary>Server node that's running the driver.</summary>
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public required string NodeId { get; set; }
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/// <summary>Driver instance's stable id (matches <c>IDriver.DriverInstanceId</c>).</summary>
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public required string DriverInstanceId { get; set; }
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/// <summary>
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/// Driver-side host identifier — Galaxy Platform / AppEngine name, Modbus
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/// <c>host:port</c>, whatever the probe returns. Opaque to the Admin UI except as
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/// a display string.
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/// </summary>
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public required string HostName { get; set; }
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/// <summary>Gets or sets the current connectivity state of the host.</summary>
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public DriverHostState State { get; set; } = DriverHostState.Unknown;
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/// <summary>Timestamp of the last state transition (not of the most recent heartbeat).</summary>
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public DateTime StateChangedUtc { get; set; }
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/// <summary>
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/// Advances on every publisher heartbeat — the Admin UI uses
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/// <c>now - LastSeenUtc > threshold</c> to flag rows whose owning Server has
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/// stopped reporting (crashed, network-partitioned, etc.), independent of
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/// <see cref="State"/>.
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/// </summary>
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public DateTime LastSeenUtc { get; set; }
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/// <summary>
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/// Optional human-readable detail populated when <see cref="State"/> is
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/// <see cref="DriverHostState.Faulted"/> — e.g. the exception message from the
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/// driver's probe. Null for Running / Stopped / Unknown transitions.
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/// </summary>
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public string? Detail { get; set; }
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}
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+18
-9
@@ -1,17 +1,26 @@
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namespace ZB.MOM.WW.OtOpcUa.Configuration.Entities;
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/// <summary>
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/// Runtime resilience counters the CapabilityInvoker + MemoryTracking + MemoryRecycle
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/// surfaces for each <c>(DriverInstanceId, HostName)</c> pair. Separate from
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/// <see cref="DriverHostStatus"/> (which owns per-host <i>connectivity</i> state) so a
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/// host that's Running but has tripped its breaker or is approaching its memory ceiling
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/// shows up distinctly on Admin <c>/hosts</c>.
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/// Runtime resilience counters per <c>(DriverInstanceId, HostName)</c> pair.
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/// <para><b>⚠️ This table is DEAD: nothing writes it and nothing reads it.</b> The only reference in
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/// the repo is the <c>DriverInstanceResilienceStatuses</c> DbSet declaration. Do not treat a query
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/// against it as a source of runtime state — it returns empty on every deployment.</para>
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/// </summary>
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/// <remarks>
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/// Per <c>docs/v2/implementation/phase-6-1-resilience-and-observability.md</c> §Stream E.1.
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/// The Admin UI left-joins this table on DriverHostStatus for display; rows are written
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/// by the runtime via a HostedService that samples the tracker at a configurable
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/// interval (default 5 s) — writes are non-critical, a missed sample is tolerated.
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/// <para>
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/// The original design (<c>docs/v2/implementation/phase-6-1-resilience-and-observability.md</c>
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/// §Stream E.1) called for a HostedService sampling the tracker every ~5 s into this table, and
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/// an Admin UI that left-joined it on <c>DriverHostStatus</c> for display. Neither was built:
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/// there is no sampler, the join exists in no razor file, and <c>DriverHostStatus</c> itself was
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/// removed in Gitea #521.
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/// </para>
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/// <para>
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/// The live data does exist — it just never goes through SQL. Resilience state reaches the
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/// AdminUI as <c>DriverResilienceStatusChanged</c> over the Phase 5 telemetry stream into the
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/// in-memory <c>IDriverResilienceStatusStore</c>, the same shape #521 adopted for per-host
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/// connectivity, and for the same reason: per-cluster mesh Phase 4 leaves a driver-only node with
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/// no ConfigDb connection to write rows with. Keep-or-delete is tracked as Gitea #524.
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/// </para>
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/// </remarks>
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public sealed class DriverInstanceResilienceStatus
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{
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@@ -1,21 +0,0 @@
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namespace ZB.MOM.WW.OtOpcUa.Configuration.Enums;
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/// <summary>
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/// Persisted mirror of <c>Core.Abstractions.HostState</c> — the lifecycle state each
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/// <c>IHostConnectivityProbe</c>-capable driver reports for its per-host topology
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/// (Galaxy Platforms / AppEngines, Modbus PLC endpoints, future OPC UA gateway upstreams).
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/// Defined here instead of re-using <c>Core.Abstractions.HostState</c> so the
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/// Configuration project stays free of driver-runtime dependencies.
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/// </summary>
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/// <remarks>
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/// The server-side publisher (follow-up PR) translates
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/// <c>HostStatusChangedEventArgs.NewState</c> to this enum on every transition and
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/// upserts into <see cref="Entities.DriverHostStatus"/>. Admin UI reads from the DB.
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/// </remarks>
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public enum DriverHostState
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{
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Unknown,
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Running,
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Stopped,
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Faulted,
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}
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+1599
File diff suppressed because it is too large
Load Diff
+56
@@ -0,0 +1,56 @@
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using System;
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using Microsoft.EntityFrameworkCore.Migrations;
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#nullable disable
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namespace ZB.MOM.WW.OtOpcUa.Configuration.Migrations
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{
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/// <summary>
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/// Drops the DriverHostStatus table (Gitea #521). The scaffolder warns this "may result in the loss
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/// of data"; here it cannot. No code ever inserted a row — the publisher hosted service its entity
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/// doc described was never written, and per-cluster mesh Phase 4 made it unbuildable as described,
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/// since a driver-only node has no ConfigDb connection. Every deployment's copy of this table is
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/// empty. Per-host connectivity now rides DriverHealthChanged.HostStatuses over the Phase 5
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/// telemetry stream to /hosts. Down() recreates the table exactly, so the rollback is lossless too.
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/// </summary>
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public partial class DropDriverHostStatusTable : Migration
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{
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/// <inheritdoc />
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protected override void Up(MigrationBuilder migrationBuilder)
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{
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migrationBuilder.DropTable(
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name: "DriverHostStatus");
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}
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/// <inheritdoc />
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protected override void Down(MigrationBuilder migrationBuilder)
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{
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migrationBuilder.CreateTable(
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name: "DriverHostStatus",
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columns: table => new
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{
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NodeId = table.Column<string>(type: "nvarchar(64)", maxLength: 64, nullable: false),
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DriverInstanceId = table.Column<string>(type: "nvarchar(64)", maxLength: 64, nullable: false),
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HostName = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: false),
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Detail = table.Column<string>(type: "nvarchar(1024)", maxLength: 1024, nullable: true),
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LastSeenUtc = table.Column<DateTime>(type: "datetime2(3)", nullable: false),
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State = table.Column<string>(type: "nvarchar(16)", maxLength: 16, nullable: false),
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StateChangedUtc = table.Column<DateTime>(type: "datetime2(3)", nullable: false)
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},
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constraints: table =>
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{
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table.PrimaryKey("PK_DriverHostStatus", x => new { x.NodeId, x.DriverInstanceId, x.HostName });
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});
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migrationBuilder.CreateIndex(
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name: "IX_DriverHostStatus_LastSeen",
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table: "DriverHostStatus",
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column: "LastSeenUtc");
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migrationBuilder.CreateIndex(
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name: "IX_DriverHostStatus_Node",
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table: "DriverHostStatus",
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column: "NodeId");
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}
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}
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}
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-40
@@ -394,46 +394,6 @@ namespace ZB.MOM.WW.OtOpcUa.Configuration.Migrations
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});
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});
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modelBuilder.Entity("ZB.MOM.WW.OtOpcUa.Configuration.Entities.DriverHostStatus", b =>
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{
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b.Property<string>("NodeId")
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.HasMaxLength(64)
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.HasColumnType("nvarchar(64)");
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b.Property<string>("DriverInstanceId")
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.HasMaxLength(64)
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.HasColumnType("nvarchar(64)");
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b.Property<string>("HostName")
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.HasMaxLength(256)
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.HasColumnType("nvarchar(256)");
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b.Property<string>("Detail")
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.HasMaxLength(1024)
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.HasColumnType("nvarchar(1024)");
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b.Property<DateTime>("LastSeenUtc")
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.HasColumnType("datetime2(3)");
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b.Property<string>("State")
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.IsRequired()
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.HasMaxLength(16)
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.HasColumnType("nvarchar(16)");
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b.Property<DateTime>("StateChangedUtc")
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.HasColumnType("datetime2(3)");
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b.HasKey("NodeId", "DriverInstanceId", "HostName");
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b.HasIndex("LastSeenUtc")
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.HasDatabaseName("IX_DriverHostStatus_LastSeen");
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b.HasIndex("NodeId")
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.HasDatabaseName("IX_DriverHostStatus_Node");
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b.ToTable("DriverHostStatus", (string)null);
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});
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modelBuilder.Entity("ZB.MOM.WW.OtOpcUa.Configuration.Entities.DriverInstance", b =>
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{
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b.Property<Guid>("DriverInstanceRowId")
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@@ -44,8 +44,6 @@ public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbConte
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public DbSet<ConfigAuditLog> ConfigAuditLogs => Set<ConfigAuditLog>();
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/// <summary>Gets the DbSet of external ID reservations.</summary>
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public DbSet<ExternalIdReservation> ExternalIdReservations => Set<ExternalIdReservation>();
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/// <summary>Gets the DbSet of driver host statuses.</summary>
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public DbSet<DriverHostStatus> DriverHostStatuses => Set<DriverHostStatus>();
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/// <summary>Gets the DbSet of driver instance resilience statuses.</summary>
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public DbSet<DriverInstanceResilienceStatus> DriverInstanceResilienceStatuses => Set<DriverInstanceResilienceStatus>();
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/// <summary>Gets the DbSet of LDAP group role mappings.</summary>
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@@ -90,7 +88,6 @@ public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbConte
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ConfigureNodeAcl(modelBuilder);
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ConfigureConfigAuditLog(modelBuilder);
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ConfigureExternalIdReservation(modelBuilder);
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ConfigureDriverHostStatus(modelBuilder);
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ConfigureDriverInstanceResilienceStatus(modelBuilder);
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ConfigureLdapGroupRoleMapping(modelBuilder);
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ConfigureScript(modelBuilder);
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@@ -542,31 +539,12 @@ public sealed class OtOpcUaConfigDbContext(DbContextOptions<OtOpcUaConfigDbConte
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});
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}
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private static void ConfigureDriverHostStatus(ModelBuilder modelBuilder)
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{
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modelBuilder.Entity<DriverHostStatus>(e =>
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{
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e.ToTable("DriverHostStatus");
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// Composite key — one row per (server node, driver instance, probe-reported host).
|
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// A redundant 2-node cluster with one Galaxy driver reporting 3 platforms produces
|
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// 6 rows because each server node owns its own runtime view; the composite key is
|
||||
// what lets both views coexist without shadowing each other.
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||||
e.HasKey(x => new { x.NodeId, x.DriverInstanceId, x.HostName });
|
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e.Property(x => x.NodeId).HasMaxLength(64);
|
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e.Property(x => x.DriverInstanceId).HasMaxLength(64);
|
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e.Property(x => x.HostName).HasMaxLength(256);
|
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e.Property(x => x.State).HasConversion<string>().HasMaxLength(16);
|
||||
e.Property(x => x.StateChangedUtc).HasColumnType("datetime2(3)");
|
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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");
|
||||
});
|
||||
}
|
||||
// ConfigureDriverHostStatus is GONE (Gitea #521). The DriverHostStatus table held per-host
|
||||
// connectivity that a publisher hosted service was supposed to upsert from each driver node. That
|
||||
// publisher was never written, and per-cluster mesh Phase 4 made it unwritable as designed: ConfigDb
|
||||
// is registered only on the admin role, so a driver-only node has no connection to write rows with.
|
||||
// Per-host connectivity now rides DriverHealthChanged.HostStatuses to /hosts over the Phase 5
|
||||
// telemetry stream, which needs no DB and survives the mesh split.
|
||||
|
||||
private static void ConfigureDriverInstanceResilienceStatus(ModelBuilder modelBuilder)
|
||||
{
|
||||
|
||||
@@ -22,13 +22,20 @@ public interface IDriverHealthPublisher
|
||||
/// </param>
|
||||
/// <param name="rediscoveryReason">The driver-supplied reason from that event; null when
|
||||
/// <paramref name="rediscoveryNeededUtc"/> is null.</param>
|
||||
/// <param name="hostStatuses">
|
||||
/// Per-host connectivity from <see cref="IHostConnectivityProbe.GetHostStatuses"/>, or null when the
|
||||
/// driver is not an <see cref="IHostConnectivityProbe"/>. Lets a multi-device driver (a FOCAS or
|
||||
/// AbLegacy instance owning several PLCs) surface ONE unreachable device that would otherwise be
|
||||
/// invisible behind an aggregate-Healthy driver row.
|
||||
/// </param>
|
||||
void Publish(
|
||||
string clusterId,
|
||||
string driverInstanceId,
|
||||
DriverHealth health,
|
||||
int errorCount5Min,
|
||||
DateTime? rediscoveryNeededUtc = null,
|
||||
string? rediscoveryReason = null);
|
||||
string? rediscoveryReason = null,
|
||||
IReadOnlyList<HostConnectivityStatus>? hostStatuses = null);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
@@ -49,6 +56,7 @@ public sealed class NullDriverHealthPublisher : IDriverHealthPublisher
|
||||
DriverHealth health,
|
||||
int errorCount5Min,
|
||||
DateTime? rediscoveryNeededUtc = null,
|
||||
string? rediscoveryReason = null)
|
||||
string? rediscoveryReason = null,
|
||||
IReadOnlyList<HostConnectivityStatus>? hostStatuses = null)
|
||||
{ /* no-op */ }
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user