Joseph Doherty
212 lines
11 KiB
C#
212 lines
11 KiB
C#
namespace ZB.MOM.WW.ScadaBridge.Communication;
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/// <summary>
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/// Configuration options for central-site communication, including per-pattern
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/// timeouts and transport heartbeat settings.
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/// </summary>
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public class CommunicationOptions
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{
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/// <summary>
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/// Central control-plane gRPC endpoints (preferred first), e.g.
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/// <c>["http://scadabridge-central-a:8083", "http://scadabridge-central-b:8083"]</c>. Dialled by
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/// <see cref="Grpc.CentralChannelProvider"/> with sticky failover/failback. Required on every site
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/// node — gRPC (<c>CentralControlService</c>) is the only site→central transport.
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/// </summary>
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/// <remarks>
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/// Sites reach central by container/host name, NOT via Traefik (which is HTTP/1 only; gRPC is
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/// h2c on the central node's dedicated <c>CentralGrpcPort</c>).
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/// </remarks>
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public List<string> CentralGrpcEndpoints { get; set; } = new();
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/// <summary>Timeout for deployment commands (typically longest due to apply logic).</summary>
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public TimeSpan DeploymentTimeout { get; set; } = TimeSpan.FromMinutes(2);
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/// <summary>Timeout for lifecycle commands (disable, enable, delete).</summary>
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public TimeSpan LifecycleTimeout { get; set; } = TimeSpan.FromSeconds(30);
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/// <summary>Timeout for artifact deployment commands.</summary>
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public TimeSpan ArtifactDeploymentTimeout { get; set; } = TimeSpan.FromMinutes(1);
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/// <summary>Timeout for remote query requests (event logs, parked messages).</summary>
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public TimeSpan QueryTimeout { get; set; } = TimeSpan.FromSeconds(30);
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/// <summary>Timeout for integration call routing.</summary>
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public TimeSpan IntegrationTimeout { get; set; } = TimeSpan.FromSeconds(30);
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/// <summary>Timeout for debug view subscribe/unsubscribe handshake.</summary>
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public TimeSpan DebugViewTimeout { get; set; } = TimeSpan.FromSeconds(10);
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/// <summary>Timeout for health report acknowledgement (fire-and-forget, but bounded).</summary>
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public TimeSpan HealthReportTimeout { get; set; } = TimeSpan.FromSeconds(10);
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/// <summary>
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/// Notification Outbox: timeout for forwarding a buffered notification to central
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/// and awaiting its <c>NotificationSubmitAck</c>. A timeout is treated as a
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/// transient failure — the Store-and-Forward engine keeps the message buffered
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/// and retries the forward at the fixed retry interval.
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/// </summary>
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public TimeSpan NotificationForwardTimeout { get; set; } = TimeSpan.FromSeconds(30);
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/// <summary>
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/// Preshared key authenticating this node's gRPC control plane — the site↔central
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/// boundary. On a site node this is the key its inbound gate
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/// (<c>ControlPlaneAuthInterceptor</c>) expects on every <c>SiteStreamService</c> call, and
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/// which central must present; central resolves the matching value per site from its own
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/// secret store under the name <c>SB-GRPC-PSK-{siteId}</c>.
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/// </summary>
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/// <remarks>
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/// <para>
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/// In production this is supplied as <c>${secret:SB-GRPC-PSK-<siteId>}</c> and expanded
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/// out of the secrets store before the host is built, so the plaintext never sits in
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/// appsettings. Development rigs set a literal, mirroring the LocalDb replication key.
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/// </para>
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/// <para>
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/// <b>Empty means closed, not open.</b> With no key set the interceptor rejects every gated
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/// call. This is not optional configuration: a node that ships without a key serves no
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/// streams and no audit pulls.
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/// </para>
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/// <para>
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/// Distinct from <c>LocalDb:Replication:ApiKey</c>, which authenticates the pair partner for
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/// database replication over the same listener. The two are never shared.
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/// </para>
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/// </remarks>
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public string GrpcPsk { get; set; } = "";
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/// <summary>
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/// Central-side per-site gRPC preshared keys, keyed by site identifier — the mirror image
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/// of <see cref="GrpcPsk"/>, which is the single key a site node expects on its own inbound
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/// gate. An entry here takes precedence over the secret store for that site.
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/// </summary>
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/// <remarks>
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/// <para>
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/// <b>Why both a config map and a secret store.</b> The store is the primary source and the
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/// only one that works for the real case: sites are added at runtime from the Central UI, so
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/// their keys cannot be enumerated in configuration at boot, and <c>SitePskProvider</c>
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/// resolves <c>SB-GRPC-PSK-{siteId}</c> on demand. This map covers the cases the store
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/// cannot or should not: a development rig that runs with no master key and injects every
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/// credential as an environment override, and an operator pinning one site's key without
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/// touching the store. Values may themselves be <c>${secret:…}</c> references, since a map
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/// declared in configuration IS enumerable at boot.
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/// </para>
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/// <para>
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/// Absence is not a fallback to "unauthenticated" in either source — a site with no key in
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/// the map and none in the store cannot be dialed at all.
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/// </para>
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/// </remarks>
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public Dictionary<string, string> SitePsks { get; set; } = new();
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/// <summary>gRPC keepalive ping interval for streaming connections.</summary>
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public TimeSpan GrpcKeepAlivePingDelay { get; set; } = TimeSpan.FromSeconds(15);
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/// <summary>gRPC keepalive ping timeout — stream is considered dead if no response within this period.</summary>
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public TimeSpan GrpcKeepAlivePingTimeout { get; set; } = TimeSpan.FromSeconds(10);
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/// <summary>Maximum lifetime for a single gRPC stream before the server forces re-establishment.</summary>
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public TimeSpan GrpcMaxStreamLifetime { get; set; } = TimeSpan.FromHours(4);
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/// <summary>Maximum number of concurrent gRPC streaming subscriptions per site node.</summary>
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public int GrpcMaxConcurrentStreams { get; set; } = 100;
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/// <summary>
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/// Send-channel capacity for a per-instance Debug View stream (<c>SubscribeInstance</c>).
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/// Lossy by design: the Debug View is a diagnostic surface and drops its oldest events
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/// under backpressure rather than stalling the site's event hub.
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/// </summary>
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public int GrpcInstanceStreamChannelCapacity { get; set; } = 1000;
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/// <summary>
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/// Send-channel capacity for the site-wide alarm stream (<c>SubscribeSite</c>). Larger
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/// than the Debug View's (WP2.3): that feed backs the operator Alarm Summary, where a
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/// silently dropped transition is a missed alarm rather than a missed diagnostic frame,
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/// and an alarm burst arriving during a WAN stall must survive the stall.
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/// </summary>
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public int GrpcSiteAlarmStreamChannelCapacity { get; set; } = 20_000;
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/// <summary>Akka.Remote transport heartbeat interval.</summary>
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public TimeSpan TransportHeartbeatInterval { get; set; } = TimeSpan.FromSeconds(5);
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/// <summary>
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/// Application-level site→central heartbeat cadence. Distinct from
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/// <see cref="TransportHeartbeatInterval"/> (the Akka.Remote failure-detector
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/// setting) — tuning the transport FD must not silently retune the health
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/// heartbeat. Default equals the old effective value (5s) — no behavior change.
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/// </summary>
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public TimeSpan ApplicationHeartbeatInterval { get; set; } = TimeSpan.FromSeconds(5);
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/// <summary>Akka.Remote transport failure detection threshold.</summary>
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public TimeSpan TransportFailureThreshold { get; set; } = TimeSpan.FromSeconds(15);
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/// <summary>
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/// Base URL (Traefik/LB) the SITE uses to fetch deploy configs from central,
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/// e.g. "https://central.example:9000". Carried in RefreshDeploymentCommand so
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/// sites need no new standing config. Empty disables notify-and-fetch fallback.
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/// </summary>
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public string CentralFetchBaseUrl { get; set; } = "";
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/// <summary>
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/// How long a staged PendingDeployment (and its fetch token) stays valid. Must
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/// comfortably cover both site nodes' fetches within one deploy window.
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/// </summary>
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public TimeSpan PendingDeploymentTtl { get; set; } = TimeSpan.FromMinutes(5);
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/// <summary>
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/// How often the central <c>PendingDeploymentPurgeActor</c> singleton reclaims
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/// expired (TTL-elapsed) PendingDeployment staging rows. Best-effort hygiene only:
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/// supersession bounds pending rows to ≤1 per instance and the config-fetch endpoint
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/// already enforces the TTL, so this purge merely sweeps rows left behind by instances
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/// that are deployed once and never re-deployed. Default 1 hour ≫ <see cref="PendingDeploymentTtl"/>.
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/// </summary>
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public TimeSpan PendingDeploymentPurgeInterval { get; set; } = TimeSpan.FromHours(1);
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// ── Aggregated live alarm cache (plan #10, Task 4) ───────────────────────────
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// Introduced by Task 4 with sane defaults; Task 6 formalizes eager validation
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// (positive interval/linger, positive concurrency/subscriber cap) and telemetry.
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/// <summary>
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/// How long the shared per-site live alarm aggregator keeps its gRPC stream +
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/// in-memory cache warm after its LAST Alarm Summary viewer leaves, before it is
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/// torn down. A short linger avoids re-seed thrash when an operator navigates away
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/// and straight back. Default 30s.
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/// </summary>
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public TimeSpan LiveAlarmCacheLinger { get; set; } = TimeSpan.FromSeconds(30);
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/// <summary>
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/// Cadence of the per-site aggregator's periodic reconcile snapshot fan-out. The
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/// backstop that corrects instance-set drift (enable/disable/deploy/delete) and any
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/// alarm delta missed by the live stream, since the aggregated stream never carries
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/// an explicit "removed" event. Default 60s.
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/// </summary>
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public TimeSpan LiveAlarmCacheReconcileInterval { get; set; } = TimeSpan.FromSeconds(60);
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/// <summary>
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/// Max concurrent per-instance snapshot fetches during a live-cache seed/reconcile
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/// fan-out — the aggregated analogue of the Alarm Summary poll's
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/// <c>MaxConcurrentFetches</c>. Default 8.
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/// </summary>
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public int LiveAlarmCacheSeedConcurrency { get; set; } = 8;
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/// <summary>
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/// Upper bound on concurrent Alarm Summary viewers sharing one site's aggregator.
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/// A defensive cap only — one gRPC stream per site is shared regardless of viewer
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/// count; this just bounds the subscriber list. Default 200.
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/// </summary>
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public int LiveAlarmCacheMaxSubscribersPerSite { get; set; } = 200;
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/// <summary>
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/// Publish-coalescing window for live alarm deltas: an applied delta marks the cache
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/// dirty and one publish (fresh snapshot + per-viewer onChanged fan-out) fires after
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/// this window, batching an alarm storm into ~4 publishes/second instead of one per
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/// transition (review 02 round 2, N6). Zero = publish per delta (legacy). Seed and
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/// reconcile publishes are always immediate. Default 250 ms.
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/// </summary>
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public TimeSpan LiveAlarmCachePublishCoalesce { get; set; } = TimeSpan.FromMilliseconds(250);
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/// <summary>
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/// Random jitter added to each per-site reconcile tick, as a fraction of
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/// <see cref="LiveAlarmCacheReconcileInterval"/> (WP2.3). Without it every aggregator
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/// started by one central failover fans its whole-site snapshot out on the same 60s
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/// boundary forever. Zero disables jitter.
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/// </summary>
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public double LiveAlarmCacheReconcileJitterFraction { get; set; } = 0.2;
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}
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