Issue 707074: timeouts incompatible w/ line-oriented protocols (original) (raw)

Created on 2003-03-20 18:58 by skip.montanaro, last changed 2022-04-10 16:07 by admin. This issue is now closed.

Files
File name Uploaded Description Edit
socket.diff skip.montanaro,2003-03-21 18:02
Messages (7)
msg15217 - (view) Author: Skip Montanaro (skip.montanaro) * (Python triager) Date: 2003-03-20 18:58
I've come to the conclusion that, as written, the higher level line- oriented protocols which use the socket library (httplib, ftplib, xmlrpclib, etc) won't work with socket timeouts. They generally do something like: self.file = self.sock.makefile('rb') then use file methods to send and receive data on the socket. Alas, the socket docs state: Timeout mode internally sets the socket in non-blocking mode. The blocking and timeout modes are shared between file descriptors and socket objects that refer to the same network endpoint. A consequence of this is that file objects returned by the makefile() method should only be used when the socket is in blocking mode; in timeout or non-blocking mode file operations that cannot be completed immediately will fail. I view this state of affairs as a bug which should be fixed at some point, as these higher level protocol modules are probably the predominant way sockets get used in Python programs.
msg15218 - (view) Author: Skip Montanaro (skip.montanaro) * (Python triager) Date: 2003-03-21 18:02
Logged In: YES user_id=44345 The attached simple patch to socket.py seems to do the trick. No tests fail as a result. The new test_urllibnet test case fails on Mac OS X without the patch and succeeds with the patch.
msg15219 - (view) Author: Jack Jansen (jackjansen) * (Python committer) Date: 2003-03-24 10:58
Logged In: YES user_id=45365 If this patch is accepted: may I request it be done soon? Changes like this often affect how things work on MacOS9 (IOW: break things on MacOS9:-), and in general changing the makefile() semantics on all non-windows platforms is something that may turn up hidden bugs, so I don't think we want this in as a last-second mod before 2.3b1 goes out.
msg15220 - (view) Author: Skip Montanaro (skip.montanaro) * (Python triager) Date: 2003-03-24 17:23
Logged In: YES user_id=44345 Jack, Any chance you can simply apply it to the source and see how it goes on MacOS9? -Skip
msg15221 - (view) Author: Neal Norwitz (nnorwitz) * (Python committer) Date: 2003-03-29 22:55
Logged In: YES user_id=33168 This works for me on linux. I don't know if there's any issue wrt to removing _needwrapper. Perhaps it should be checked in and see if anyone complains? I'm not sure who else should review this patch.
msg15222 - (view) Author: Skip Montanaro (skip.montanaro) * (Python triager) Date: 2003-03-30 05:10
Logged In: YES user_id=44345 Okay, checked in and closed. Let's see who screams. Lib/socket.py 1.36 Lib/test/test_urllibnet.py 1.1 Misc/NEWS 1.705
msg15223 - (view) Author: Guido van Rossum (gvanrossum) * (Python committer) Date: 2003-04-11 20:38
Logged In: YES user_id=6380 Not me. I didn't even notice this was checked in! Good job.
History
Date User Action Args
2022-04-10 16:07:48 admin set github: 38191
2003-03-20 18:58:56 skip.montanaro create