[pywin32-bugs] [ pywin32-Bugs-2994205 ] SimpleXMLRPCServer behave strangely in win32 service

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Bugs item #2994205, was opened at 2010-04-29 22:51
Message generated for change (Comment added) made by adamhj
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: adamhj (adamhj)
Assigned to: Nobody/Anonymous (nobody)
Summary: SimpleXMLRPCServer behave strangely in win32 service

Initial Comment:
i found that when i run a SimpleXMLRPCServer instance in a windows service(using pywin32 win32service module), the server will occasionally refuse xml rpc request.



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>Comment By: adamhj (adamhj)
Date: 2010-04-29 23:20

Message:
and my testing environment is python 2.6.4, pywin32-214.win32-py2.6,
windows 2003 server(x86) with sp2

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Comment By: adamhj (adamhj)
Date: 2010-04-29 23:16

Message:
sorry, i'm using sf tracker for the first time and mistake the post button
for upload attachment button.

the bad response behavior (of SimpleXMLRPCServer in service) does not
happen everytime but appears regularly, it seems it will occurs every a few
calls

the attachment i uploaded yet is my testing script of the server side, and
the client side is a simple loop:
#----------------------------------------------------------------------
#client.py
import xmlrpclib

s = xmlrpclib.ServerProxy('http://localhost:8000')
while True:
		print s.func0()
#----------------------------------------------------------------------

way to product the bug:
1. install server.py as windows service: 
    python server.py install
2. start the service in service manager
3. run client.py in console:
    python client.py > output.txt

and after a few calls, the error is raised:

Traceback (most recent call last):
  File "D:\test\xmlrpcsvc\client.py", line 6, in <module>
    print s.func0()
  File "D:\Python26\lib\xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "D:\Python26\lib\xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "D:\Python26\lib\xmlrpclib.py", line 1243, in request
    headers
xmlrpclib.ProtocolError: <ProtocolError for localhost:8000/RPC2: -1 >


i changed func0 to func1,2,3 to test different parameter type and size,
and all output.txt have exactly 37 lines, so it seems that this error will
happen every 38 client calls

sniffer shows that in the failed session, the server will close the
connection(TCP FIN) just after receive client request, without sending any
response data or error info

this behavior only exists in windows service process, when running a
SimpleXMLRPCServer from console script, this does not happen, so i think
maybe this is some issue in pywin32 service module

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=551954&aid=2994205&group_id=78018