feat: adopt shared ZB.MOM.WW.Health probes; add /healthz; canonical writer

2026-06-01 13:46:49 -04:00
parent 2a7ff03718
commit bbff1d19b5
5 changed files with 124 additions and 272 deletions
@@ -1,45 +0,0 @@
-using Akka.Cluster;
-using Microsoft.Extensions.Diagnostics.HealthChecks;
-using ZB.MOM.WW.ScadaBridge.Host.Actors;
-
-namespace ZB.MOM.WW.ScadaBridge.Host.Health;
-
-/// <summary>
-/// Health check that returns healthy only if this node is the active (leader) node
-/// in the Akka.NET cluster. Used by Traefik to route traffic to the active node.
-/// </summary>
-public class ActiveNodeHealthCheck : IHealthCheck
-{
-    private readonly AkkaHostedService _akkaService;
-
-    /// <summary>Initializes a new <see cref="ActiveNodeHealthCheck"/> with the given Akka hosted service.</summary>
-    /// <param name="akkaService">The Akka hosted service providing access to the actor system and cluster state.</param>
-    public ActiveNodeHealthCheck(AkkaHostedService akkaService)
-    {
-        _akkaService = akkaService;
-    }
-
-    /// <summary>Returns healthy if this node is the cluster leader (active node); otherwise returns unhealthy.</summary>
-    /// <param name="context">Health check context providing registration details.</param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    public Task<HealthCheckResult> CheckHealthAsync(
-        HealthCheckContext context,
-        CancellationToken cancellationToken = default)
-    {
-        var system = _akkaService.ActorSystem;
-        if (system == null)
-            return Task.FromResult(HealthCheckResult.Unhealthy("ActorSystem not yet available."));
-
-        var cluster = Cluster.Get(system);
-        var self = cluster.SelfMember;
-
-        if (self.Status != MemberStatus.Up)
-            return Task.FromResult(HealthCheckResult.Unhealthy($"Node not Up (status: {self.Status})."));
-
-        var leader = cluster.State.Leader;
-        if (leader != null && leader == self.Address)
-            return Task.FromResult(HealthCheckResult.Healthy("Active node (cluster leader)."));
-
-        return Task.FromResult(HealthCheckResult.Unhealthy("Standby node (not cluster leader)."));
-    }
-}
@@ -1,52 +0,0 @@
-using Akka.Cluster;
-using Microsoft.Extensions.Diagnostics.HealthChecks;
-using ZB.MOM.WW.ScadaBridge.Host.Actors;
-
-namespace ZB.MOM.WW.ScadaBridge.Host.Health;
-
-/// <summary>
-/// Health check that verifies this node is an active member of the Akka.NET cluster.
-/// Returns healthy only if the node's self-member status is Up or Joining.
-/// </summary>
-public class AkkaClusterHealthCheck : IHealthCheck
-{
-    private readonly AkkaHostedService _akkaService;
-
-    /// <summary>
-    /// Initializes the health check with the Akka hosted service.
-    /// </summary>
-    /// <param name="akkaService">The hosted service providing access to the Akka actor system.</param>
-    public AkkaClusterHealthCheck(AkkaHostedService akkaService)
-    {
-        _akkaService = akkaService;
-    }
-
-    /// <summary>
-    /// Checks that this node is an active member of the Akka.NET cluster.
-    /// </summary>
-    /// <param name="context">Health check context.</param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    public Task<HealthCheckResult> CheckHealthAsync(
-        HealthCheckContext context,
-        CancellationToken cancellationToken = default)
-    {
-        var system = _akkaService.ActorSystem;
-        if (system == null)
-            return Task.FromResult(HealthCheckResult.Degraded("ActorSystem not yet available."));
-
-        var cluster = Cluster.Get(system);
-        var status = cluster.SelfMember.Status;
-
-        var result = status switch
-        {
-            MemberStatus.Up or MemberStatus.Joining =>
-                HealthCheckResult.Healthy($"Akka cluster member status: {status}"),
-            MemberStatus.Leaving or MemberStatus.Exiting =>
-                HealthCheckResult.Degraded($"Akka cluster member status: {status}"),
-            _ =>
-                HealthCheckResult.Unhealthy($"Akka cluster member status: {status}")
-        };
-
-        return Task.FromResult(result);
-    }
-}
@@ -1,43 +0,0 @@
-using Microsoft.Extensions.Diagnostics.HealthChecks;
-using ZB.MOM.WW.ScadaBridge.ConfigurationDatabase;
-
-namespace ZB.MOM.WW.ScadaBridge.Host.Health;
-
-/// <summary>
-/// Health check that verifies database connectivity for Central nodes.
-/// </summary>
-public class DatabaseHealthCheck : IHealthCheck
-{
-    private readonly ScadaBridgeDbContext _dbContext;
-
-    /// <summary>
-    /// Initializes a new <see cref="DatabaseHealthCheck"/>.
-    /// </summary>
-    /// <param name="dbContext">The EF Core database context used to test connectivity.</param>
-    public DatabaseHealthCheck(ScadaBridgeDbContext dbContext)
-    {
-        _dbContext = dbContext;
-    }
-
-    /// <summary>
-    /// Checks database connectivity by attempting to open a connection.
-    /// </summary>
-    /// <param name="context">Health check context providing failure status information.</param>
-    /// <param name="cancellationToken">Cancellation token for the check.</param>
-    public async Task<HealthCheckResult> CheckHealthAsync(
-        HealthCheckContext context,
-        CancellationToken cancellationToken = default)
-    {
-        try
-        {
-            var canConnect = await _dbContext.Database.CanConnectAsync(cancellationToken);
-            return canConnect
-                ? HealthCheckResult.Healthy("Database connection is available.")
-                : HealthCheckResult.Unhealthy("Database connection failed.");
-        }
-        catch (Exception ex)
-        {
-            return HealthCheckResult.Unhealthy("Database connection failed.", ex);
-        }
-    }
-}