Initial commit

src/ReverseLlama.Server/PendingCommand.cs

@@ -0,0 +1,17 @@
+using ReverseLlama.Protocol;
+
+namespace ReverseLlama.Server;
+
+internal sealed class PendingCommand
+{
+    private readonly TaskCompletionSource<TunnelMessage> _completion = new(TaskCreationOptions.RunContinuationsAsynchronously);
+
+    public Task<TunnelMessage> WaitAsync(CancellationToken cancellationToken) =>
+        _completion.Task.WaitAsync(cancellationToken);
+
+    public void Complete(TunnelMessage message) =>
+        _completion.TrySetResult(message);
+
+    public void Fail(string error) =>
+        _completion.TrySetException(new InvalidOperationException(error));
+}