Restructure solution layout by module

src/Concelier/__Libraries/StellaOps.Concelier.Storage.Mongo/MongoSessionProvider.cs

@@ -0,0 +1,34 @@
+using Microsoft.Extensions.Options;
+using MongoDB.Driver;
+
+namespace StellaOps.Concelier.Storage.Mongo;
+
+public interface IMongoSessionProvider
+{
+    Task<IClientSessionHandle> StartSessionAsync(CancellationToken cancellationToken = default);
+}
+
+internal sealed class MongoSessionProvider : IMongoSessionProvider
+{
+    private readonly IMongoClient _client;
+    private readonly MongoStorageOptions _options;
+
+    public MongoSessionProvider(IMongoClient client, IOptions<MongoStorageOptions> options)
+    {
+        _client = client ?? throw new ArgumentNullException(nameof(client));
+        _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
+    }
+
+    public Task<IClientSessionHandle> StartSessionAsync(CancellationToken cancellationToken = default)
+    {
+        var sessionOptions = new ClientSessionOptions
+        {
+            DefaultTransactionOptions = new TransactionOptions(
+                readPreference: ReadPreference.Primary,
+                readConcern: ReadConcern.Majority,
+                writeConcern: WriteConcern.WMajority.With(wTimeout: _options.CommandTimeout))
+        };
+
+        return _client.StartSessionAsync(sessionOptions, cancellationToken);
+    }
+}