/// <summary>
/// For calling MusicBee functions through TCP. For list of available functions see TcpMessaging.Command enum.
/// </summary>
/// <typeparam name="T">Return type of selected function. If void, use type 'object'</typeparam>
/// <param name="cmd">Selected function.</param>
/// <param name="args">All arguments required by selected function. If no parameters required, leave empty.</param>
/// <returns></returns>
public async Task <T> SendRequest <T>(Command cmd, params object[] args)
{
Logger.Trace("Begin SendRequest: {0}", cmd);
if (!TcpRequest.CheckIfValidParameters(cmd, args))
{
throw new Exception("Invalid function parameters!");
}
var request = new TcpRequest(cmd, args);
WriteToStreamAsync(request);
if (!request.ResponseRequired)
{
Logger.Trace("End SendRequest {0} - response not required", cmd);
return(default(T));
}
try
{
_responseStack.Add(cmd, new TaskCompletionSource <TcpResponse>());
Logger.Debug("Request {0} - awaiting response", cmd);
await _responseStack[cmd].Task;
_responseStack.TryGetValue(cmd, out var responseTask);
Logger.Debug("Request {0} - received response", cmd);
if (responseTask == null)
{
throw new NullReferenceException("Response not found in responseStack!");
}
_responseStack.Remove(cmd);
Logger.Trace("End SendRequest {0} - response arrived", cmd);
return((T)responseTask.Task.Result.Response);
}
catch (Exception e)
{
Logger.Error(e, "Failed to get response");
throw;
}
}
protected virtual void OnRequestArrived(TcpRequest req) => RequestArrived?.Invoke(this, req);
