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test: retry OPC UA host start on a port bind race (TOCTOU in AllocateFreePort)

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The tests probe a free port (bind 0, release) and start the SDK server later; under a
highly parallel run another test can take the port in between and the SDK fails with
'Failed to establish tcp listener sockets for Ipv4 and IPv6.'. OpcUaHostStart.StartAsync
builds a fresh host + server on a fresh port per attempt (up to 5) when the failure is a
bind failure; all 45 start sites in OpcUaServer.Tests, OpcUaServer.IntegrationTests and
Runtime.Tests use it. Per-attempt GUID ApplicationUris are hoisted out of the host factory
because a changed URI against a reused PKI store fails with 'Cannot access private key'.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
This commit is contained in:
Joseph Doherty
2026-10-08 22:30:55 -04:00
parent d83e8f21aa
commit f02067d295
41 changed files with 948 additions and 1078 deletions
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tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/SdkServiceLevelPublisherTests.cs
+30 -35
View File
@@ -23,19 +23,21 @@ public sealed class SdkServiceLevelPublisherTests : IDisposable
[Fact]
public async Task Publish_writes_value_to_Server_ServiceLevel_variable()
{
var server = new StandardServer();
await using var host = new OpcUaApplicationHost(
new OpcUaApplicationHostOptions
{
ApplicationName = "OtOpcUa.SvcLevel",
ApplicationUri = $"urn:OtOpcUa.SvcLevel:{Guid.NewGuid():N}",
OpcUaPort = AllocateFreePort(),
PublicHostname = "localhost",
PkiStoreRoot = _pkiRoot,
},
NullLogger<OpcUaApplicationHost>.Instance);
await host.StartAsync(server, Ct);
var applicationUri = $"urn:OtOpcUa.SvcLevel:{Guid.NewGuid():N}";
var started = await OpcUaHostStart.StartAsync(
port => new OpcUaApplicationHost(
new OpcUaApplicationHostOptions
{
ApplicationName = "OtOpcUa.SvcLevel",
ApplicationUri = applicationUri,
OpcUaPort = port,
PublicHostname = "localhost",
PkiStoreRoot = _pkiRoot,
},
NullLogger<OpcUaApplicationHost>.Instance),
() => new StandardServer(), Ct);
await using var host = started.Host;
var server = started.Server;
var publisher = new SdkServiceLevelPublisher(
server.CurrentInstance,
@@ -52,19 +54,21 @@ public sealed class SdkServiceLevelPublisherTests : IDisposable
[Fact]
public async Task Publish_is_idempotent_when_called_multiple_times()
{
var server = new StandardServer();
await using var host = new OpcUaApplicationHost(
new OpcUaApplicationHostOptions
{
ApplicationName = "OtOpcUa.SvcLevel.Idem",
ApplicationUri = $"urn:OtOpcUa.SvcLevel.Idem:{Guid.NewGuid():N}",
OpcUaPort = AllocateFreePort(),
PublicHostname = "localhost",
PkiStoreRoot = _pkiRoot,
},
NullLogger<OpcUaApplicationHost>.Instance);
await host.StartAsync(server, Ct);
var applicationUri = $"urn:OtOpcUa.SvcLevel.Idem:{Guid.NewGuid():N}";
var started = await OpcUaHostStart.StartAsync(
port => new OpcUaApplicationHost(
new OpcUaApplicationHostOptions
{
ApplicationName = "OtOpcUa.SvcLevel.Idem",
ApplicationUri = applicationUri,
OpcUaPort = port,
PublicHostname = "localhost",
PkiStoreRoot = _pkiRoot,
},
NullLogger<OpcUaApplicationHost>.Instance),
() => new StandardServer(), Ct);
await using var host = started.Host;
var server = started.Server;
var publisher = new SdkServiceLevelPublisher(
server.CurrentInstance,
NullLogger<SdkServiceLevelPublisher>.Instance);
@@ -76,15 +80,6 @@ public sealed class SdkServiceLevelPublisherTests : IDisposable
server.CurrentInstance.ServerObject.ServiceLevel.Value.ShouldBe((byte)240);
}
private static int AllocateFreePort()
{
using var listener = new System.Net.Sockets.TcpListener(System.Net.IPAddress.Loopback, 0);
listener.Start();
var port = ((System.Net.IPEndPoint)listener.LocalEndpoint).Port;
listener.Stop();
return port;
}
/// <summary>Disposes and cleans up the test resources.</summary>
public void Dispose()
{