龙卷风websocket处理程序未捕获的异常

Question

I'm trying to catch uncaught exceptions in my WebSocketHandler. But Tornado's WebSocketHandler does not have the same exception handling interface as the HTTP RequestHandler.

In the above source, it looks like exceptions are caught and logged here:

def _run_callback(self, callback, *args, **kwargs):
    """Runs the given callback with exception handling.

    On error, aborts the websocket connection and returns False.
    """
    try:
        callback(*args, **kwargs)
    except Exception:
        app_log.error("Uncaught exception in %s",
                      self.request.path, exc_info=True)
        self._abort()

Instead of hacking the handler and subclassing WebSocketProtocol which implements the above method, is there a better way to catch exceptions in the WebSocketHandler ?

Answer 1

Subclassing and overriding WebSocketProtocol._run_callback is currently the best way to do this from a base class. But since it's cumbersome to subclass and override this method, it's probably better to handle this at the application level until proper support can be added to the framework . Either wrap all your callbacks in a big try/except block or if you have enough of them that this gets irritating, you can make your own exception-catching decorator.