Package: emacs;
Reported by: dick.r.chiang <at> gmail.com
Date: Thu, 5 Aug 2021 16:48:01 UTC
Severity: normal
Tags: patch
Found in version 28.0.50
Fixed in version 28.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org:bug#49897; Package emacs.
(Thu, 05 Aug 2021 16:48:01 GMT) Full text and rfc822 format available.dick.r.chiang <at> gmail.com:bug-gnu-emacs <at> gnu.org.
(Thu, 05 Aug 2021 16:48:01 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: dick.r.chiang <at> gmail.com To: bug-gnu-emacs <at> gnu.org Subject: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously Date: Thu, 05 Aug 2021 12:46:59 -0400
[0001-Rationalize-url-retrieve-synchronously.patch (text/x-diff, inline)]
From b560aa029810dcfdee278b4b3614c938d996fa6c Mon Sep 17 00:00:00 2001 From: dickmao <none> Date: Thu, 5 Aug 2021 12:41:39 -0400 Subject: [PATCH] Rationalize url-retrieve-synchronously It's impossible to reason about this function without the conveniences of throw-catch and unwind-protect. Related bug#49861. * lisp/url/url.el (url-retrieve-synchronously): Accept-process-output on a null process. That is the safer, more conventional way of achieving non-blocking sleep-for. --- lisp/url/url.el | 125 ++++++++++++++++++------------------------------ 1 file changed, 46 insertions(+), 79 deletions(-) diff --git a/lisp/url/url.el b/lisp/url/url.el index a6565e2cdb..be66510dd8 100644 --- a/lisp/url/url.el +++ b/lisp/url/url.el @@ -235,85 +235,52 @@ url-retrieve-synchronously TIMEOUT is passed, it should be a number that says (in seconds) how long to wait for a response before giving up." (url-do-setup) - - (let ((retrieval-done nil) - (start-time (current-time)) - (url-asynchronous nil) - (asynch-buffer nil) - (timed-out nil)) - (setq asynch-buffer - (url-retrieve url (lambda (&rest ignored) - (url-debug 'retrieval "Synchronous fetching done (%S)" (current-buffer)) - (setq retrieval-done t - asynch-buffer (current-buffer))) - nil silent inhibit-cookies)) - (if (null asynch-buffer) - ;; We do not need to do anything, it was a mailto or something - ;; similar that takes processing completely outside of the URL - ;; package. - nil - (let ((proc (get-buffer-process asynch-buffer))) - ;; If the access method was synchronous, `retrieval-done' should - ;; hopefully already be set to t. If it is nil, and `proc' is also - ;; nil, it implies that the async process is not running in - ;; asynch-buffer. This happens e.g. for FTP files. In such a case - ;; url-file.el should probably set something like a `url-process' - ;; buffer-local variable so we can find the exact process that we - ;; should be waiting for. In the mean time, we'll just wait for any - ;; process output. - (while (and (not retrieval-done) - (or (not timeout) - (not (setq timed-out - (time-less-p timeout - (time-since start-time)))))) - (url-debug 'retrieval - "Spinning in url-retrieve-synchronously: %S (%S)" - retrieval-done asynch-buffer) - (if (buffer-local-value 'url-redirect-buffer asynch-buffer) - (setq proc (get-buffer-process - (setq asynch-buffer - (buffer-local-value 'url-redirect-buffer - asynch-buffer)))) - (if (and proc (memq (process-status proc) - '(closed exit signal failed)) - ;; Make sure another process hasn't been started. - (eq proc (or (get-buffer-process asynch-buffer) proc))) - ;; FIXME: It's not clear whether url-retrieve's callback is - ;; guaranteed to be called or not. It seems that url-http - ;; decides sometimes consciously not to call it, so it's not - ;; clear that it's a bug, but even then we need to decide how - ;; url-http can then warn us that the download has completed. - ;; In the mean time, we use this here workaround. - ;; XXX: The callback must always be called. Any - ;; exception is a bug that should be fixed, not worked - ;; around. - (progn ;; Call delete-process so we run any sentinel now. - (delete-process proc) - (setq retrieval-done t))) - ;; We used to use `sit-for' here, but in some cases it wouldn't - ;; work because apparently pending keyboard input would always - ;; interrupt it before it got a chance to handle process input. - ;; `sleep-for' was tried but it lead to other forms of - ;; hanging. --Stef - (unless (or (with-local-quit - (accept-process-output proc 1)) - (null proc)) - ;; accept-process-output returned nil, maybe because the process - ;; exited (and may have been replaced with another). If we got - ;; a quit, just stop. - (when quit-flag - (delete-process proc)) - (setq proc (and (not quit-flag) - (get-buffer-process asynch-buffer)))))) - ;; On timeouts, make sure we kill any pending processes. - ;; There may be more than one if we had a redirect. - (when timed-out - (when (process-live-p proc) - (delete-process proc)) - (when-let ((aproc (get-buffer-process asynch-buffer))) - (when (process-live-p aproc) - (delete-process aproc)))))) - asynch-buffer)) + (let* (url-asynchronous + data-buffer + (callback (lambda (&rest _args) + (setq data-buffer (current-buffer)) + (url-debug 'retrieval + "Synchronous fetching done (%S)" + data-buffer)))) + (if-let ((start-time (current-time)) + (proc-buffer (url-retrieve url callback nil silent inhibit-cookies))) + (unwind-protect + (catch 'done + (while (not data-buffer) + (when (and timeout (time-less-p timeout (time-since start-time))) + (url-debug 'retrieval "Timed out %s (after %ss)" url + (float-time (time-since start-time))) + (throw 'done 'timeout)) + (url-debug 'retrieval + "Spinning in url-retrieve-synchronously: nil (%S)" + proc-buffer) + (when-let ((redirect-buffer (buffer-local-value + 'url-redirect-buffer + proc-buffer))) + (unless (eq redirect-buffer proc-buffer) + (url-debug 'retrieval + "Redirect in url-retrieve-synchronously: %S -> %S" + proc-buffer redirect-buffer) + (let (kill-buffer-query-functions) + (kill-buffer proc-buffer)) + ;; Accommodate self-admitted hack in commit 55d1d8b + (setq proc-buffer redirect-buffer))) + (when-let ((proc (get-buffer-process proc-buffer))) + (when (memq (process-status proc) + '(closed exit signal failed)) + ;; Process sentinel vagaries occasionally cause + ;; url-retrieve to fail calling callback. + (unless data-buffer + (url-debug 'retrieval "Dead process %s" url) + (throw 'done 'exception)))) + ;; Querying over consumer internet in the US takes 100 ms, + ;; so split the difference. + (accept-process-output nil 0.05))) + (unless (eq data-buffer proc-buffer) + (let (kill-buffer-query-functions) + (kill-buffer proc-buffer)))) + (url-debug 'retrieval "Synchronous fetching unnecessary %s" url)) + data-buffer)) ;; url-mm-callback called from url-mm, which requires mm-decode. (declare-function mm-dissect-buffer "mm-decode" -- 2.26.2
[Message part 2 (text/plain, inline)]
In GNU Emacs 28.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10) of 2021-08-05 built on dick Repository revision: a9709f95a1a9c0f32227f9458bfe6410fccde0aa Repository branch: el-gz Windowing system distributor 'The X.Org Foundation', version 11.0.11906000 System Description: Ubuntu 18.04.4 LTS Configured using: 'configure --prefix=/home/dick/.local PKG_CONFIG_PATH=/home/dick/.local/lib/pkgconfig' Configured features: CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2 LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Magit Log Minor modes in effect: async-bytecomp-package-mode: t global-git-commit-mode: t magit-auto-revert-mode: t show-paren-mode: t projectile-mode: t flx-ido-mode: t override-global-mode: t shell-dirtrack-mode: t global-hl-line-mode: t 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emacs) Memory information: ((conses 16 1311187 135586) (symbols 48 55510 4) (strings 32 206640 27720) (string-bytes 1 8554859) (vectors 16 76514) (vector-slots 8 2135257 126708) (floats 8 2336 4198) (intervals 56 5063 1552) (buffers 992 42))
bug-gnu-emacs <at> gnu.org:bug#49897; Package emacs.
(Fri, 06 Aug 2021 11:28:02 GMT) Full text and rfc822 format available.Message #8 received at 49897 <at> debbugs.gnu.org (full text, mbox):
From: Lars Ingebrigtsen <larsi <at> gnus.org> To: dick.r.chiang <at> gmail.com Cc: 49897 <at> debbugs.gnu.org Subject: Re: bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously Date: Fri, 06 Aug 2021 13:27:43 +0200
dick.r.chiang <at> gmail.com writes: > It's impossible to reason about this function without the > conveniences of throw-catch and unwind-protect. Related bug#49861. Well, that's a big change here, and the code had a lot of special-casing to handle various edge cases with quit-ing and stuff... which... I agree with you shouldn't be necessary, so I've done some tests and applied your patch (with some trivial changes): > + (if-let ((start-time (current-time)) Doing if-lets on things that can't be nil is mildly confusing, so I moved that up to the surrounding let... > + (proc-buffer (url-retrieve url callback nil silent inhibit-cookies))) ... and the same here, which allowed for less indentation. So now I guess we'll wait for the bug reports to arrive about something subtle not working any more here. :-) -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no
Lars Ingebrigtsen <larsi <at> gnus.org>
to control <at> debbugs.gnu.org.
(Fri, 06 Aug 2021 11:28:02 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org:bug#49897; Package emacs.
(Fri, 06 Aug 2021 12:16:02 GMT) Full text and rfc822 format available.Message #13 received at 49897 <at> debbugs.gnu.org (full text, mbox):
From: dick <dick.r.chiang <at> gmail.com> To: Lars Ingebrigtsen <larsi <at> gnus.org> Cc: 49897 <at> debbugs.gnu.org Subject: Re: bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously Date: Fri, 06 Aug 2021 08:15:27 -0400
Yes, this is much better. I wonder what came over me to obfuscate things like that.
bug-gnu-emacs <at> gnu.org:bug#49897; Package emacs.
(Fri, 06 Aug 2021 13:10:02 GMT) Full text and rfc822 format available.Message #16 received at 49897 <at> debbugs.gnu.org (full text, mbox):
From: dick <dick.r.chiang <at> gmail.com> To: Lars Ingebrigtsen <larsi <at> gnus.org> Cc: 49897 <at> debbugs.gnu.org Subject: Re: bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously Date: Fri, 06 Aug 2021 09:09:32 -0400
I'm sorry to say the rewrite doesn't solve bug#49861 (hanging http GETs) for me. The process filter `url-http-generic-filter` just isn't seeing any data from the remote site, and given the frequency of occurrence, it's not the remote site's fault. There's something off about the C-level network descriptor handling for process filters. While (in my mind) the url lisp code is not culpable, I'm still glad we rewrote url-retrieve-synchronously.
bug-gnu-emacs <at> gnu.org:bug#49897; Package emacs.
(Fri, 06 Aug 2021 13:48:02 GMT) Full text and rfc822 format available.Message #19 received at 49897 <at> debbugs.gnu.org (full text, mbox):
From: Lars Ingebrigtsen <larsi <at> gnus.org> To: dick <dick.r.chiang <at> gmail.com> Cc: 49897 <at> debbugs.gnu.org Subject: Re: bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously Date: Fri, 06 Aug 2021 15:47:21 +0200
dick <dick.r.chiang <at> gmail.com> writes: > I'm sorry to say the rewrite doesn't solve bug#49861 (hanging http GETs) for > me. The process filter `url-http-generic-filter` just isn't seeing any data > from the remote site, and given the frequency of occurrence, it's not the > remote site's fault. There's something off about the C-level network > descriptor handling for process filters. Yes, people have been poking away at the process.c code again and again to try to fix these hangs, and they usually seem to be able to fix their own use case... it's pretty maddening. It's always impossible for anybody else to reproduce the problems, which doesn't help. It's not that network connections are complex in themselves, but the Emacs process stuff has grown from a viewpoint of "run a command and output the data in the displayed buffer", and that's grown into real network connections, with coding systems applied and filters and... (And then TLS was added, and then there was that rewrite to make it all asynchronous, which complicated things even further.) So what we have is a slow, convoluted mess in this area, which is a shame. I have for years wanted to redo the network stuff (note -- note the process stuff; they're separate issues) to be efficient and sane. That is: You can push octets to the network, and you get octets back, stashed into a unibyte buffer only. And then it's up to the application level, not the network level, to interpret the octets. But it's that problem of finding the time... -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no
Debbugs Internal Request <help-debbugs <at> gnu.org>
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(Sat, 04 Sep 2021 11:24:06 GMT) Full text and rfc822 format available.
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