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POtornado websockets ioloop exception
 

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  1. POtornado websockets ioloop exception
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    <p>I'm trying to get the hello-world example from the tornado websockets docs working. I'm pretty new to tornado, and totally new to websockets. I have specified the following handler, straight from the docs:</p> <pre><code>class EchoWebSocket(tornado.websocket.WebSocketHandler): def open(self): print "WebSocket opened" def on_message(self, message): self.write_message(u"You said: " + message) def on_close(self): print "WebSocket closed" </code></pre> <p>and call it from javascript using </p> <pre><code>var ws = new WebSocket("ws://localhost:6665/websocket"); ws.onopen = function() { ws.send("Hello, world"); }; ws.onmessage = function (evt) { alert(evt.data); }; </code></pre> <p>also straight from the docs. I immediately hit three exceptions:</p> <pre><code>[E 111123 17:45:54 iostream:233] Uncaught exception, closing connection. Traceback (most recent call last): File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers self.request_callback(self._request) File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__ handler = spec.handler_class(self, request, **spec.kwargs) TypeError: default __new__ takes no parameters [E 111123 17:45:54 iostream:221] Uncaught exception, closing connection. Traceback (most recent call last): File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 199, in _handle_events self._handle_read() File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 258, in _handle_read if self._read_from_buffer(): File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 325, in _read_from_buffer self._consume(loc + delimiter_len)) File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers self.request_callback(self._request) File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__ handler = spec.handler_class(self, request, **spec.kwargs) TypeError: default __new__ takes no parameters [E 111123 17:45:54 ioloop:281] Exception in I/O handler for fd 4 Traceback (most recent call last): File "/local/lib/python2.5/site-packages/tornado/ioloop.py", line 269, in start self._handlers[fd](fd, events) File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 199, in _handle_events self._handle_read() File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 258, in _handle_read if self._read_from_buffer(): File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 325, in _read_from_buffer self._consume(loc + delimiter_len)) File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped callback(*args, **kwargs) File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers self.request_callback(self._request) File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__ handler = spec.handler_class(self, request, **spec.kwargs) TypeError: default __new__ takes no parameters </code></pre> <p>which I confess to being unable to properly parse, and I'm nervous to dip into tornado.web. Is there something obvious I'm doing wrong? I'm using tornado 1.2.1.</p>
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