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message.data becoms None in spawned greenlets

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难度
3/5
预计耗时
1-2 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
python

调研方向

Start at ws4py.websocket.WebSocket and the received_message entry point, then trace the message lifecycle when gevent.spawn runs the handler. Reproduce the reported behavior if possible and determine what should preserve message.data; done means spawned handlers receive the original data without requiring deepcopy, with a regression test if the project supports one.

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描述

Hi there,

I don't have a self-contained test case but I can easily reproduce the following nevertheless in my project.

In a subclass of ws4py.websocket.WebSocket that is running in a gevent-based server I implemented the received_message method.

This works fine as long as it looks similar to the below:

def received_message(self, message):
    _self._on_received_message(message.data)

However, the moment I spawn the handler function into its own greenlet as below ..

from gevent import spawn

def received_message(self, message):
    spawn(_self._on_received_message, message.data)

.. message.data becomes None somewhere between spawn and the moment _self._on_received_message gets called but at any rate _self._on_received_message receives None, the original data is lost by the time that method is called in its own greenlet.

The workaround is to deepcopy it before spawning the greenlet

from copy import deepcopy
from gevent import spawn

def received_message(self, message):
    spawn(_self._on_received_message, deepcopy(message.data))
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Python
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