Joseph Doherty
57 lines
2.8 KiB
C#
57 lines
2.8 KiB
C#
using Microsoft.AspNetCore.Server.Kestrel.Core;
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using ZB.MOM.WW.ScadaBridge.Host;
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namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
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/// <summary>
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/// The site node's Kestrel configuration, asserted against the code that actually ships (the other
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/// Host startup tests re-declare their own <c>ConfigureKestrel</c> lambda, which can never catch a
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/// regression in <c>Program.cs</c>'s).
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/// </summary>
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public class SiteKestrelSetupTests
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{
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[Fact]
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public void SiteListener_EnablesHttp2Keepalive()
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{
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// Arch-review 2026-08-19 P4-3. Kestrel's default KeepAlivePingDelay is TimeSpan.MaxValue —
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// no server-initiated pings — so a half-open HTTP/2 connection is never detected on a
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// stream that is legitimately silent. The LocalDb sync stream is exactly that: with the
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// dialling node crashed or partitioned, this node's handler stays parked on a dead stream
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// holding the single-stream guard, refusing the reconnect that would heal the pair.
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var options = new KestrelServerOptions();
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SiteKestrelSetup.Configure(options, grpcPort: 8083, metricsPort: 8084);
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Assert.NotEqual(TimeSpan.MaxValue, options.Limits.Http2.KeepAlivePingDelay);
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Assert.Equal(SiteKestrelSetup.Http2KeepAlivePingDelay, options.Limits.Http2.KeepAlivePingDelay);
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Assert.Equal(SiteKestrelSetup.Http2KeepAlivePingTimeout, options.Limits.Http2.KeepAlivePingTimeout);
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// Detection has to be quick enough to matter, and a ping must not be its own timeout.
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Assert.True(SiteKestrelSetup.Http2KeepAlivePingTimeout < SiteKestrelSetup.Http2KeepAlivePingDelay);
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Assert.True(
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SiteKestrelSetup.Http2KeepAlivePingDelay + SiteKestrelSetup.Http2KeepAlivePingTimeout
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<= TimeSpan.FromMinutes(2));
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}
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[Fact]
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public void SiteListener_KeepsGrpcHttp2Only_AndMetricsHttp1Capable()
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{
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// The keepalive change must not disturb the protocol split: h2c-only on the gRPC port so
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// Grpc.AspNetCore can serve it without TLS ALPN, HTTP/1.1-capable on the metrics port so a
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// standard Prometheus scraper can reach /metrics.
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var options = new KestrelServerOptions();
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SiteKestrelSetup.Configure(options, grpcPort: 8083, metricsPort: 8084);
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var endpoints = options.GetType()
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.GetProperty("CodeBackedListenOptions", System.Reflection.BindingFlags.Instance
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| System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public)!
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.GetValue(options) as System.Collections.IEnumerable;
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Assert.NotNull(endpoints);
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var protocols = endpoints!.Cast<ListenOptions>().Select(o => o.Protocols).ToList();
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Assert.Equal(2, protocols.Count);
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Assert.Equal(HttpProtocols.Http2, protocols[0]);
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Assert.Equal(HttpProtocols.Http1AndHttp2, protocols[1]);
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}
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}
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