/// <summary>Try to execute the specified action input as a command.</summary>
/// <param name="actionInput">The action input to try to execute.</param>
private void TryExecuteAction(ActionInput actionInput)
{
try
{
ScriptingCommand command = CommandCreator.Instance.Create(actionInput);
if (command == null)
{
return;
}
// Verify the user has permissions to use this command.
string guardsErrorMessage = CommandGuardHelpers.VerifyCommandPermission(command);
if (guardsErrorMessage == null)
{
guardsErrorMessage = (string)command.GuardsDelegate.DynamicInvoke(actionInput);
}
// Verify that the other command-specific guards are passed.
if (guardsErrorMessage == null)
{
// Execute the command if we passed all the guards.
command.ExecuteDelegate.DynamicInvoke(actionInput);
}
else
{
// Otherwise display what went wrong to the user of the action.
IController controller = actionInput.Controller;
controller.Write(new OutputBuilder().AppendLine(guardsErrorMessage));
}
}
catch (Exception ex)
{
// Most of our exceptions should be TargetInvocationExceptions but we're going to
// handle them basically the same way as others, except that we only care about the
// inner exception (what actually went wrong, since we know we're doing invokes here).
if (ex is TargetInvocationException && ex.InnerException != null)
{
ex = ex.InnerException;
}
// In order to isolate command-specific issues, we're going to trap the exception, log
// the details, and kill that command. (Other commands and the game itself should be
// able to continue through such situations.)
// Start gathering info, but carefully to avoid causing potential further exceptions here.
IController controller = actionInput.Controller;
#if DEBUG
Thing thing = controller != null ? controller.Thing : null;
string thingName = thing != null ? thing.Name : "[null]";
string thingID = thing != null?thing.Id.ToString() : "[null]";
string fullCommand = actionInput != null ? actionInput.FullText : "[null]";
string format = "Exception encountered for command: {1}{0}From thing: {2} (ID: {3}){0}{4}";
string message = string.Format(format, Environment.NewLine, fullCommand, thingName, thingID, ex.ToDeepString());
#endif
// If the debugger is attached, we probably want to break now in order to better debug
// the issue closer to where it occurred; if your debugger broke here you may want to
// look at the stack trace to see where the exception originated.
if (Debugger.IsAttached)
{
string stackTrace = ex.StackTrace;
Debugger.Break();
}
// TODO: FIX: this.host..UpdateSubSystemHost(this, message);
if (controller != null)
{
#if DEBUG
controller.Write(new OutputBuilder().AppendLine(message));
#else
controller.Write(new OutputBuilder().AppendLine("An error occured processing your command."));
#endif
}
}
}
/// <summary>Try to execute the specified action input as a command.</summary>
/// <param name="actionInput">The action input to try to execute.</param>
private void TryExecuteAction(ActionInput actionInput)
{
Debug.Assert(actionInput != null, "actionInput must be defined.");
try
{
ScriptingCommand command = CommandCreator.Instance.Create(actionInput);
if (command == null)
{
return;
}
// Verify the user has permissions to use this command.
string guardsErrorMessage = CommandGuardHelpers.VerifyCommandPermission(command);
if (guardsErrorMessage == null)
{
guardsErrorMessage = (string)command.GuardsDelegate.DynamicInvoke(actionInput);
}
// Verify that the other command-specific guards are passed.
if (guardsErrorMessage == null)
{
// Execute the command if we passed all the guards.
command.ExecuteDelegate.DynamicInvoke(actionInput);
}
else
{
// Otherwise display what went wrong to the issuing session of this action input.
// (If there is no such session, such as an AI issuing a malformed action, for now this is just ignored. TODO: Send this issue to server log?)
actionInput.Session?.WriteLine(guardsErrorMessage);
}
}
catch (Exception ex)
{
// Most of our exceptions should be TargetInvocationExceptions but we're going to
// handle them basically the same way as others, except that we only care about the
// inner exception (what actually went wrong, since we know we're doing invokes here).
if (ex is TargetInvocationException && ex.InnerException != null)
{
ex = ex.InnerException;
}
// In order to isolate command-specific issues, we're going to trap the exception, log
// the details, and kill that command. (Other commands and the game itself should be
// able to continue through such situations.)
// Start gathering info, but carefully to avoid causing potential further exceptions here.
#if DEBUG
// TODO: Improve action error output to always provide full details to server log and admin players.
// https://github.com/DavidRieman/WheelMUD/issues/136
string thingName = actionInput.Actor?.Name ?? "[null]";
string thingID = actionInput.Actor?.Id.ToString() ?? "[null]";
string fullCommand = actionInput.FullText ?? "[null]";
string format = "Exception encountered for command: {1}{0}From thing: {2} (ID: {3}){0}{4}";
string message = string.Format(format, Environment.NewLine, fullCommand, thingName, thingID, ex.ToDeepString());
#else
string message = "An error occurred while processing your command.";
#endif
actionInput.Session?.WriteLine(message);
// If the debugger is attached, we probably want to break now in order to better debug
// the issue closer to where it occurred; if your debugger broke here you may want to
// look at the stack trace to see where the exception originated.
if (Debugger.IsAttached)
{
string stackTrace = ex.StackTrace;
Debugger.Break();
}
}
}
