From: gnus via info-gnus-english <info-gnus-english@gnu.org>
To: bobnewell@bobnewell.net
Cc: info-gnus-english@gnu.org
Subject: RE: How to trap an error when connecting to a news server
Date: Sat, 04 Jan 2020 19:31:05 +0000 [thread overview]
Message-ID: <1578166265275.914646@criptext.com> (raw)
In-Reply-To: <1578146518407.757655@criptext.com>
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On Sat, 4 Jan 2020 at 7:09 PM, Bob Newell < bobnewell@bobnewell.net > wrote:> >
(defun news-check ()
(condition-case err
(message "The result is %s" (gnus-group-get-new-news))
(news-error
(message "I expect the server closed again %s",err)
)
)
)
I could be mistaken in this, but in your code above, where did you get
'news-error' as the name of the error condition raised? I can't find this
anywhere in the gnus source tree. Do you know for sure that
gnus-group-get-new-news (or anything it calls) raises that condition?
Thank you for your response. It is useful to me that you ask this. I could not
tell from the manual that "arith-error" in the example had a specific meaning,
so I arbitrarily changed it.
https://www.gnu.org/software/emacs/manual/html_node/elisp/Handling-Errors.html
How do I tell what the error condition will be? The code in nntp.el is this (I
think this is where the server closed condition occurs) :
(defun nntp-report (&rest args)
"Report an error from the nntp backend. The first string in ARGS
can be a format string. For some commands, the failed command may be
retried once before actually displaying the error report."
(if nntp--report-1
(progn
;; Throw out to nntp-with-open-group-error so that the connection may
;; be restored and the command retried."
(when nntp-record-commands
(nntp-record-command "*** CONNECTION LOST ***"))
(throw 'nntp-with-open-group-error t))
(when nntp-record-commands
(nntp-record-command "*** CALLED nntp-report ***"))
(nnheader-report 'nntp args)
(apply 'error args)
))
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next prev parent reply other threads:[~2020-01-04 19:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-04 14:01 gnus via info-gnus-english
2020-01-04 19:08 ` Bob Newell
2020-01-04 19:31 ` gnus via info-gnus-english [this message]
2020-01-04 20:20 ` gnus via info-gnus-english
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