baseline: OpenMU upstream b5a0961 (fresh source)

src/Network/ConnectionExtensions.cs

@@ -0,0 +1,29 @@
+// <copyright file="ConnectionExtensions.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Network;
+
+/// <summary>
+/// Extension methods for <see cref="IConnection"/>.
+/// </summary>
+public static class ConnectionExtensions
+{
+    /// <summary>
+    /// Sends a message asynchronously.
+    /// </summary>
+    /// <param name="connection">The connection.</param>
+    /// <param name="packetBuilder">The packet builder which writes to the <see cref="IConnection.Output"/> and returns the length of the packet in bytes.</param>
+    public static async ValueTask SendAsync(this IConnection connection, Func<int> packetBuilder)
+    {
+        if (!connection.Connected)
+        {
+            return;
+        }
+
+        using var l = await connection.OutputLock.LockAsync().ConfigureAwait(false);
+        var length = packetBuilder();
+        connection.Output.Advance(length);
+        await connection.Output.FlushAsync().ConfigureAwait(false);
+    }
+}