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Re: trapping process filter error in a thread
From: |
Thien-Thi Nguyen |
Subject: |
Re: trapping process filter error in a thread |
Date: |
Sat, 02 Apr 2022 20:07:31 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
() Felix Dietrich <felix.dietrich@sperrhaken.name>
() Thu, 24 Mar 2022 03:33:50 +0100
> would like to use Emacs' threads and ‘url-http’ funcs.
You are much braver than I ;). I am not sure if the url
library is robust enough for that task, but you can certainly
try and play around with it.
'Tis a fine line between brave and foolish, i'm told. :-D
> (a) Can anyone else reproduce this on their Emacs?
Yes (also Debianʼs 27.1), but it does not appear to have
anything to do with threads: it happens just as well when you
call ‘func’ directly.
I think this tells us that error handing wrt threads are as if
they were invoked as a (top-level) command.
[analysis: chain of failures] I have not found a good way to
handle these errors with the url library.
Thanks for digging into the details. After some poking around,
i realize that the url*.el facility has quite a lot of baggage
to deal w/, as well. It's amazing how much cruft RFCs output!
> (c) Is there a recommended way to trap process filter
> errors for a noninteractive (perhaps batch) session?
Fix the process filter ;).
Haha!
I found the variable ‘command-error-function’ in the Emacs
Lisp manual [...].
Good eye! I have managed to adapt your code fragment to produce
a bad.el (attached here):
bad.el
Description: application/emacs-lisp
that is able to trap the error (see bad.out, here):
bad.out
Description: Binary data
Curiously, there is ‘no-catch’ in the CAR of ‘var’ contents, but
i was not able to find any mention of it in the Elisp reference
manual.
> (d) Is there a more idiomatic way to work w/ threads and
> ‘url-http’ (or async network connections, in general)?
[url-*.el overview, plus emacs-aio]
I hope to be able to study these Someday.
> Thank-you for any insight into this corner of Emacs Lisp!
[‘read-string’ in batch mode]
Thanks for the tip. It's good to see Emacs can be useful in
many different contexts.
--
Thien-Thi Nguyen -----------------------------------------------
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