feat(batch27): implement jetstream bootstrap and account wiring

dotnet/src/ZB.MOM.NatsNet.Server/Accounts/Account.JetStream.cs

@@ -0,0 +1,62 @@
+namespace ZB.MOM.NatsNet.Server;
+
+public sealed partial class Account
+{
+    internal Exception? EnableAllJetStreamServiceImportsAndMappings()
+    {
+        _mu.EnterReadLock();
+        var server = Server as NatsServer;
+        _mu.ExitReadLock();
+
+        if (server == null)
+            return new InvalidOperationException("jetstream account not registered");
+
+        var systemAccount = server.SystemAccount();
+        var destinationName = systemAccount?.Name ?? string.Empty;
+
+        if (systemAccount != null && !ServiceImportExists(destinationName, JsApiSubjects.JsAllApi))
+        {
+            var err = AddServiceImport(systemAccount, JsApiSubjects.JsAllApi, JsApiSubjects.JsAllApi);
+            if (err != null)
+                return new InvalidOperationException($"error setting up jetstream service imports for account: {err.Message}", err);
+        }
+
+        var domain = server.GetOpts().JetStreamDomain;
+        if (!string.IsNullOrWhiteSpace(domain))
+        {
+            var mappings = new Dictionary<string, string>(StringComparer.Ordinal)
+            {
+                [$"$JS.{domain}.API.>"] = JsApiSubjects.JsAllApi,
+                [$"$JS.{domain}.API.INFO"] = JsApiSubjects.JsApiAccountInfo,
+            };
+
+            _mu.EnterReadLock();
+            try
+            {
+                foreach (var mapping in _mappings)
+                    mappings.Remove(mapping.Source);
+            }
+            finally
+            {
+                _mu.ExitReadLock();
+            }
+
+            foreach (var (src, dest) in mappings)
+            {
+                var err = AddMapping(src, dest);
+                if (err != null)
+                    server.Errorf("Error adding JetStream domain mapping: {0}", err.Message);
+            }
+        }
+
+        return null;
+    }
+
+    internal Exception? EnableJetStreamInfoServiceImportOnly()
+    {
+        if (ServiceImportShadowed(JsApiSubjects.JsApiAccountInfo))
+            return null;
+
+        return EnableAllJetStreamServiceImportsAndMappings();
+    }
+}