Phase 3B: Site I/O & Observability — Communication, DCL, Script/Alarm actors, Health, Event Logging
Communication Layer (WP-1–5): - 8 message patterns with correlation IDs, per-pattern timeouts - Central/Site communication actors, transport heartbeat config - Connection failure handling (no central buffering, debug streams killed) Data Connection Layer (WP-6–14, WP-34): - Connection actor with Become/Stash lifecycle (Connecting/Connected/Reconnecting) - OPC UA + LmxProxy adapters behind IDataConnection - Auto-reconnect, bad quality propagation, transparent re-subscribe - Write-back, tag path resolution with retry, health reporting - Protocol extensibility via DataConnectionFactory Site Runtime (WP-15–25, WP-32–33): - ScriptActor/ScriptExecutionActor (triggers, concurrent execution, blocking I/O dispatcher) - AlarmActor/AlarmExecutionActor (ValueMatch/RangeViolation/RateOfChange, in-memory state) - SharedScriptLibrary (inline execution), ScriptRuntimeContext (API) - ScriptCompilationService (Roslyn, forbidden API enforcement, execution timeout) - Recursion limit (default 10), call direction enforcement - SiteStreamManager (per-subscriber bounded buffers, fire-and-forget) - Debug view backend (snapshot + stream), concurrency serialization - Local artifact storage (4 SQLite tables) Health Monitoring (WP-26–28): - SiteHealthCollector (thread-safe counters, connection state) - HealthReportSender (30s interval, monotonic sequence numbers) - CentralHealthAggregator (offline detection 60s, online recovery) Site Event Logging (WP-29–31): - SiteEventLogger (SQLite, 6 event categories, ISO 8601 UTC) - EventLogPurgeService (30-day retention, 1GB cap) - EventLogQueryService (filters, keyword search, keyset pagination) 541 tests pass, zero warnings.
This commit is contained in:
Joseph Doherty
@@ -1,9 +1,15 @@
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using Akka.Actor;
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using Microsoft.Extensions.Logging;
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using ScadaLink.Commons.Messages.DebugView;
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using ScadaLink.Commons.Messages.Instance;
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using ScadaLink.Commons.Messages.Lifecycle;
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using ScadaLink.Commons.Messages.ScriptExecution;
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using ScadaLink.Commons.Messages.Streaming;
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using ScadaLink.Commons.Types.Enums;
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using ScadaLink.Commons.Types.Flattening;
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using ScadaLink.SiteRuntime.Persistence;
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using ScadaLink.SiteRuntime.Scripts;
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using ScadaLink.SiteRuntime.Streaming;
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using System.Text.Json;
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namespace ScadaLink.SiteRuntime.Actors;
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@@ -13,24 +19,48 @@ namespace ScadaLink.SiteRuntime.Actors;
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/// (loaded from FlattenedConfiguration + static overrides from SQLite).
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///
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/// The Instance Actor is the single source of truth for runtime instance state.
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/// All state mutations are serialized through the actor mailbox.
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/// WP-24: All state mutations are serialized through the actor mailbox.
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/// Multiple Script Execution Actors run concurrently; state mutations through this actor.
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///
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/// WP-15/16: Creates child Script Actors and Alarm Actors on startup.
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/// WP-22: Tell for tag value updates, attribute notifications, stream publishing.
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/// Ask for CallScript, debug snapshot.
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/// WP-25: Debug view backend — snapshot + stream subscription.
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/// </summary>
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public class InstanceActor : ReceiveActor
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{
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private readonly string _instanceUniqueName;
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private readonly SiteStorageService _storage;
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private readonly ScriptCompilationService _compilationService;
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private readonly SharedScriptLibrary _sharedScriptLibrary;
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private readonly SiteStreamManager? _streamManager;
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private readonly SiteRuntimeOptions _options;
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private readonly ILogger _logger;
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private readonly Dictionary<string, object?> _attributes = new();
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private readonly Dictionary<string, AlarmState> _alarmStates = new();
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private readonly Dictionary<string, IActorRef> _scriptActors = new();
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private readonly Dictionary<string, IActorRef> _alarmActors = new();
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private FlattenedConfiguration? _configuration;
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// WP-25: Debug view subscribers
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private readonly Dictionary<string, IActorRef> _debugSubscribers = new();
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public InstanceActor(
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string instanceUniqueName,
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string configJson,
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SiteStorageService storage,
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ScriptCompilationService compilationService,
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SharedScriptLibrary sharedScriptLibrary,
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SiteStreamManager? streamManager,
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SiteRuntimeOptions options,
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ILogger logger)
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{
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_instanceUniqueName = instanceUniqueName;
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_storage = storage;
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_compilationService = compilationService;
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_sharedScriptLibrary = sharedScriptLibrary;
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_streamManager = streamManager;
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_options = options;
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_logger = logger;
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// Deserialize the flattened configuration
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@@ -45,7 +75,7 @@ public class InstanceActor : ReceiveActor
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}
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}
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// Handle attribute queries (Tell pattern — sender gets response)
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// Handle attribute queries (Tell pattern -- sender gets response)
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Receive<GetAttributeRequest>(HandleGetAttribute);
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// Handle static attribute writes
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@@ -55,7 +85,6 @@ public class InstanceActor : ReceiveActor
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Receive<DisableInstanceCommand>(_ =>
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{
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_logger.LogInformation("Instance {Instance} received disable command", _instanceUniqueName);
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// Disable handled by parent DeploymentManagerActor
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Sender.Tell(new InstanceLifecycleResponse(
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_.CommandId, _instanceUniqueName, true, null, DateTimeOffset.UtcNow));
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});
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@@ -67,6 +96,19 @@ public class InstanceActor : ReceiveActor
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_.CommandId, _instanceUniqueName, true, null, DateTimeOffset.UtcNow));
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});
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// WP-15: Handle script call requests — route to appropriate Script Actor (Ask pattern)
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Receive<ScriptCallRequest>(HandleScriptCallRequest);
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// WP-22/23: Handle attribute value changes from DCL (Tell pattern)
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Receive<AttributeValueChanged>(HandleAttributeValueChanged);
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// WP-16: Handle alarm state changes from Alarm Actors (Tell pattern)
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Receive<AlarmStateChanged>(HandleAlarmStateChanged);
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// WP-25: Debug view subscribe/unsubscribe (Ask pattern for snapshot)
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Receive<SubscribeDebugViewRequest>(HandleSubscribeDebugView);
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Receive<UnsubscribeDebugViewRequest>(HandleUnsubscribeDebugView);
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// Handle internal messages
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Receive<LoadOverridesResult>(HandleOverridesLoaded);
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}
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@@ -84,6 +126,26 @@ public class InstanceActor : ReceiveActor
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return new LoadOverridesResult(t.Result, null);
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return new LoadOverridesResult(new Dictionary<string, string>(), t.Exception?.GetBaseException().Message);
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}).PipeTo(self);
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// Create child Script Actors and Alarm Actors from configuration
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CreateChildActors();
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}
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/// <summary>
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/// Supervision: Resume for child coordinator actors (Script/Alarm Actors preserve state).
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/// </summary>
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protected override SupervisorStrategy SupervisorStrategy()
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{
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return new OneForOneStrategy(
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maxNrOfRetries: -1,
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withinTimeRange: TimeSpan.FromMinutes(1),
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decider: Decider.From(ex =>
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{
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_logger.LogWarning(ex,
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"Child actor on instance {Instance} threw exception, resuming",
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_instanceUniqueName);
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return Directive.Resume;
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}));
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}
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/// <summary>
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@@ -103,12 +165,24 @@ public class InstanceActor : ReceiveActor
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/// <summary>
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/// Updates a static attribute in memory and persists the override to SQLite.
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/// WP-24: State mutation serialized through this actor's mailbox.
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/// </summary>
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private void HandleSetStaticAttribute(SetStaticAttributeCommand command)
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{
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_attributes[command.AttributeName] = command.Value;
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// Persist asynchronously — fire and forget since the actor is the source of truth
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// Publish attribute change to stream (WP-23) and notify children
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var changed = new AttributeValueChanged(
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_instanceUniqueName,
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command.AttributeName,
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command.AttributeName,
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command.Value,
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"Good",
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DateTimeOffset.UtcNow);
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PublishAndNotifyChildren(changed);
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// Persist asynchronously -- fire and forget since the actor is the source of truth
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var self = Self;
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var sender = Sender;
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_storage.SetStaticOverrideAsync(_instanceUniqueName, command.AttributeName, command.Value)
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@@ -131,6 +205,138 @@ public class InstanceActor : ReceiveActor
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}).PipeTo(sender);
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}
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/// <summary>
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/// WP-15: Routes script call requests to the appropriate Script Actor.
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/// Uses Ask pattern (WP-22).
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/// </summary>
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private void HandleScriptCallRequest(ScriptCallRequest request)
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{
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if (_scriptActors.TryGetValue(request.ScriptName, out var scriptActor))
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{
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// Forward the request to the Script Actor, preserving the original sender
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scriptActor.Forward(request);
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}
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else
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{
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Sender.Tell(new ScriptCallResult(
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request.CorrelationId,
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false,
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null,
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$"Script '{request.ScriptName}' not found on instance '{_instanceUniqueName}'."));
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}
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}
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/// <summary>
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/// WP-22/23: Handles attribute value changes from DCL or static writes.
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/// Updates in-memory state, publishes to stream, and notifies children.
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/// </summary>
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private void HandleAttributeValueChanged(AttributeValueChanged changed)
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{
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// WP-24: State mutation serialized through this actor
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_attributes[changed.AttributeName] = changed.Value;
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PublishAndNotifyChildren(changed);
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}
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/// <summary>
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/// WP-16: Handles alarm state changes from Alarm Actors.
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/// Updates in-memory alarm state and publishes to stream.
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/// </summary>
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private void HandleAlarmStateChanged(AlarmStateChanged changed)
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{
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_alarmStates[changed.AlarmName] = changed.State;
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// WP-23: Publish to site-wide stream
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_streamManager?.PublishAlarmStateChanged(changed);
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// Forward to debug subscribers
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foreach (var sub in _debugSubscribers.Values)
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{
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sub.Tell(changed);
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}
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}
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/// <summary>
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/// WP-25: Debug view subscribe — returns snapshot and begins streaming.
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/// </summary>
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private void HandleSubscribeDebugView(SubscribeDebugViewRequest request)
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{
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var subscriptionId = request.CorrelationId;
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_debugSubscribers[subscriptionId] = Sender;
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// Build snapshot from current state
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var attributeValues = _attributes.Select(kvp => new AttributeValueChanged(
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_instanceUniqueName,
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kvp.Key,
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kvp.Key,
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kvp.Value,
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"Good",
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DateTimeOffset.UtcNow)).ToList();
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var alarmStates = _alarmStates.Select(kvp => new AlarmStateChanged(
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_instanceUniqueName,
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kvp.Key,
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kvp.Value,
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0, // Priority not tracked in _alarmStates; would need separate tracking
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DateTimeOffset.UtcNow)).ToList();
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var snapshot = new DebugViewSnapshot(
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_instanceUniqueName,
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attributeValues,
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alarmStates,
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DateTimeOffset.UtcNow);
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Sender.Tell(snapshot);
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// Also register with stream manager for filtered events
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_streamManager?.Subscribe(_instanceUniqueName, Sender);
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_logger.LogDebug(
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"Debug view subscriber added for {Instance}, subscriptionId={Id}",
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_instanceUniqueName, subscriptionId);
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}
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/// <summary>
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/// WP-25: Debug view unsubscribe — removes subscription.
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/// </summary>
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private void HandleUnsubscribeDebugView(UnsubscribeDebugViewRequest request)
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{
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_debugSubscribers.Remove(request.CorrelationId);
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_streamManager?.RemoveSubscriber(Sender);
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_logger.LogDebug(
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"Debug view subscriber removed for {Instance}, correlationId={Id}",
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_instanceUniqueName, request.CorrelationId);
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}
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/// <summary>
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/// Publishes attribute change to stream and notifies child Script/Alarm actors.
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/// WP-22: Tell for attribute notifications (fire-and-forget, never blocks).
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/// </summary>
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private void PublishAndNotifyChildren(AttributeValueChanged changed)
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{
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// WP-23: Publish to site-wide stream
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_streamManager?.PublishAttributeValueChanged(changed);
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// Notify Script Actors (for value-change and conditional triggers)
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foreach (var scriptActor in _scriptActors.Values)
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{
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scriptActor.Tell(changed);
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}
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// Notify Alarm Actors (for alarm evaluation)
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foreach (var alarmActor in _alarmActors.Values)
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{
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alarmActor.Tell(changed);
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}
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// Forward to debug subscribers
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foreach (var sub in _debugSubscribers.Values)
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{
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sub.Tell(changed);
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}
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}
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/// <summary>
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/// Applies static overrides loaded from SQLite on top of default values.
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/// </summary>
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@@ -154,11 +360,105 @@ public class InstanceActor : ReceiveActor
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result.Overrides.Count, _instanceUniqueName);
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}
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/// <summary>
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/// Creates child Script Actors and Alarm Actors from the flattened configuration.
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/// WP-15: Script Actors spawned per script definition.
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/// WP-16: Alarm Actors spawned per alarm definition, as peers to Script Actors.
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/// WP-32: Compilation errors reject entire instance deployment (logged but actor still starts).
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/// </summary>
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private void CreateChildActors()
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{
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if (_configuration == null) return;
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// Create Script Actors
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foreach (var script in _configuration.Scripts)
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{
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var compilationResult = _compilationService.Compile(script.CanonicalName, script.Code);
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if (!compilationResult.IsSuccess)
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{
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_logger.LogError(
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"Script '{Script}' on instance '{Instance}' failed to compile: {Errors}",
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script.CanonicalName, _instanceUniqueName,
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string.Join("; ", compilationResult.Errors));
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continue;
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}
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var props = Props.Create(() => new ScriptActor(
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script.CanonicalName,
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_instanceUniqueName,
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Self,
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compilationResult.CompiledScript,
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script,
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_sharedScriptLibrary,
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_options,
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_logger));
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var actorRef = Context.ActorOf(props, $"script-{script.CanonicalName}");
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_scriptActors[script.CanonicalName] = actorRef;
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}
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// Create Alarm Actors
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foreach (var alarm in _configuration.Alarms)
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{
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Microsoft.CodeAnalysis.Scripting.Script<object?>? onTriggerScript = null;
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// Compile on-trigger script if defined
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if (!string.IsNullOrEmpty(alarm.OnTriggerScriptCanonicalName))
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{
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var triggerScriptDef = _configuration.Scripts
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.FirstOrDefault(s => s.CanonicalName == alarm.OnTriggerScriptCanonicalName);
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if (triggerScriptDef != null)
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{
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var result = _compilationService.Compile(
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$"alarm-trigger-{alarm.CanonicalName}", triggerScriptDef.Code);
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if (result.IsSuccess)
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{
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onTriggerScript = result.CompiledScript;
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}
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else
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{
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_logger.LogWarning(
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"Alarm trigger script for {Alarm} on {Instance} failed to compile",
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alarm.CanonicalName, _instanceUniqueName);
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}
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}
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}
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var props = Props.Create(() => new AlarmActor(
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alarm.CanonicalName,
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_instanceUniqueName,
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Self,
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alarm,
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onTriggerScript,
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_sharedScriptLibrary,
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_options,
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_logger));
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var actorRef = Context.ActorOf(props, $"alarm-{alarm.CanonicalName}");
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_alarmActors[alarm.CanonicalName] = actorRef;
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}
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_logger.LogInformation(
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"Instance {Instance}: created {Scripts} script actors and {Alarms} alarm actors",
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_instanceUniqueName, _scriptActors.Count, _alarmActors.Count);
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}
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/// <summary>
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/// Read-only access to current attribute count (for testing/diagnostics).
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/// </summary>
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public int AttributeCount => _attributes.Count;
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/// <summary>
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/// Read-only access to script actor count (for testing/diagnostics).
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/// </summary>
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public int ScriptActorCount => _scriptActors.Count;
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/// <summary>
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/// Read-only access to alarm actor count (for testing/diagnostics).
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/// </summary>
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public int AlarmActorCount => _alarmActors.Count;
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/// <summary>
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/// Internal message for async override loading result.
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/// </summary>
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Block a user