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When I cause an error inside received_message, it gets silenced and the socket gets closed

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
30/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
networking

Research direction

Start with the minimal reproduction in the issue and trace how ws4py.websocket.WebSocket handles exceptions from received_message. Check the error and socket-close path when make_error() raises; done means the behavior is observable and covered by a regression test or documented outcome.

Written by the indexing model from the issue text.

Description

I have an error in one of my larger programs that occurs somewhere in received_message or in a function that is called inside of that function. The error is pretty hard to pin down because when it happens it just gets silenced so I can't figure out where it is, and also the socket gets closed. I wrote a smaller program to simulate this and got the same results. Here's the smaller program:

from ws4py.server.cherrypyserver import WebSocketPlugin, WebSocketTool
from ws4py.websocket import WebSocket

cherrypy.config.update({'server.socket_port': 80, 'server.socket_host': '0.0.0.0'})

WebSocketPlugin(cherrypy.engine).subscribe()
cherrypy.tools.websocket = WebSocketTool()

def make_error():
	this_makes_an_error()

class EchoWebSocket(WebSocket):
	def closed(self, code, reason=None):
		print 'socket closed'
	def received_message(self, msg):
                make_error()
		self.send(msg.data, msg.is_binary) # echo

class Root(object):
	@cherrypy.expose
	def index(self):
		return 'some HTML with a websocket javascript connection'

	@cherrypy.expose
	def ws(self):
		# you can access the class instance through
		handler = cherrypy.request.ws_handler

if __name__ == '__main__':
	cherrypy.quickstart(Root(), '/', config={'/ws': {'tools.websocket.on': True, 'tools.websocket.handler_cls': EchoWebSocket}})```


When I send a message into the socket via JavaScript, I see no error in the console, just a "socket closed."
Thanks for your help!
Dominant language
Python
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