New submission from Joel Lovinger <[email protected]>:
In Python 2.4.3 a Telnet.expect with timeout=0 would always make at least one
call to Telnet.fill_rawq if a match couldn't be found and the connection was
open.
In Python 2.7.1/2.7.3 Telnet.expect with timeout=0 breaks before any call to
Telnet.fill_rawq if a match isn't found in already read raw/cooked data.
Expected behavior is that on timeout=0 at least one non-blocking attempt should
be made to read from the connection when necessary to fulfill a match.
>From code inspection (including Python 2.7.3) timeout behavior was modified to
>provide an overall elapsed timeout instead of passing unmodified timeout to
>each select resulting in the failure.
Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from telnetlib import Telnet
>>> import time
>>> tn = Telnet("scn.org", 23)
>>> time.sleep(5) # short wait for data to be available
>>> tn.expect(['.{16}'], 0)
(-1, None, '')
>>>
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from telnetlib import Telnet
>>> import time
>>> tn = Telnet("scn.org", 23)
>>> time.sleep(5) # short wait for data to be available
>>> tn.expect(['.{16}'], 0)
(0, <_sre.SRE_Match object at 0x01752410>, '\r\nSeattle Communit')
>>>
----------
components: Library (Lib)
messages: 158096
nosy: Joel.Lovinger
priority: normal
severity: normal
status: open
title: telnetlib Telnet.expect fails with timeout=0
type: behavior
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue14556>
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