Joseph Doherty
7b0b9c7365
Solution + 23 src projects + 26 test projects renamed; folders, csproj, namespaces, and ScadaLinkDbContext/ScadaBridgeDbContext class updated. ActorSystem "scadalink" → "scadabridge", Akka seed-node URLs migrated. SQL roles/logins, LDAP domains, CLI command name, and CLI config dir (~/.scadalink → ~/.scadabridge) also renamed. Build green; 5 Host.Tests fail awaiting SQL login rename in next commit. Pre-existing StaleTagMonitor timing flakes unchanged. Rename script committed at tools/rename-to-scadabridge.sh.
58 lines
2.3 KiB
C#
58 lines
2.3 KiB
C#
using Akka.Cluster;
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using ZB.MOM.WW.ScadaBridge.Host.Actors;
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using ZB.MOM.WW.ScadaBridge.InboundAPI;
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namespace ZB.MOM.WW.ScadaBridge.Host.Health;
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/// <summary>
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/// InboundAPI-008 / InboundAPI-022: production implementation of
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/// <see cref="IActiveNodeGate"/> backed by the running Akka.NET cluster.
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///
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/// The inbound API is "Central cluster only (active node)" — a standby central
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/// node must not execute method scripts or <c>Route.To()</c> calls. This gate
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/// mirrors the leadership check in <see cref="ActiveNodeHealthCheck"/> (the
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/// node is the cluster leader, <see cref="MemberStatus.Up"/>), so
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/// <see cref="InboundApiEndpointFilter"/> can return HTTP 503 on a standby.
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///
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/// Registered only in the Central-role branch of <c>Program.cs</c>. The gate
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/// is resolved per request from <c>HttpContext.RequestServices</c>; while the
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/// <c>AkkaHostedService</c> is still warming up (<c>ActorSystem == null</c>)
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/// or the node has not yet reached <see cref="MemberStatus.Up"/>, this
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/// implementation reports <c>IsActiveNode == false</c> — the safe-by-default
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/// answer matching the standby case.
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/// </summary>
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public sealed class ActiveNodeGate : IActiveNodeGate
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{
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private readonly AkkaHostedService _akkaService;
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/// <summary>Initializes a new <see cref="ActiveNodeGate"/> bound to the given Akka hosted service.</summary>
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/// <param name="akkaService">The Akka hosted service exposing the cluster's <see cref="Akka.Actor.ActorSystem"/>.</param>
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public ActiveNodeGate(AkkaHostedService akkaService)
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{
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_akkaService = akkaService;
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}
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/// <summary>
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/// <c>true</c> only when this node has joined the cluster (<see cref="MemberStatus.Up"/>)
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/// AND is the current cluster leader; <c>false</c> in every other state
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/// (actor system not yet started, node still joining, node is a standby).
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/// </summary>
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public bool IsActiveNode
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{
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get
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{
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var system = _akkaService.ActorSystem;
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if (system == null)
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return false;
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var cluster = Cluster.Get(system);
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var self = cluster.SelfMember;
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if (self.Status != MemberStatus.Up)
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return false;
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var leader = cluster.State.Leader;
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return leader != null && leader == self.Address;
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}
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}
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}
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