* bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously
@ 2021-08-05 16:46 dick.r.chiang
2021-08-06 11:27 ` Lars Ingebrigtsen
0 siblings, 1 reply; 5+ messages in thread
From: dick.r.chiang @ 2021-08-05 16:46 UTC (permalink / raw)
To: 49897
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[-- Attachment #1: 0001-Rationalize-url-retrieve-synchronously.patch --]
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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
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/home/dick/.emacs.d/elpa/gnus-5.14pre/gnus-dired hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/gnus-dired
/home/dick/.emacs.d/elpa/gnus-5.14pre/nnnil hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/nnnil
/home/dick/.emacs.d/elpa/gnus-5.14pre/gnus-gravatar hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/gnus-gravatar
/home/dick/.emacs.d/elpa/gnus-5.14pre/nngateway hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/nngateway
/home/dick/.emacs.d/elpa/gnus-5.14pre/gnus-logic hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/gnus-logic
/home/dick/.emacs.d/elpa/gnus-5.14pre/deuglify hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/deuglify
/home/dick/.emacs.d/elpa/gnus-5.14pre/gnus-topic hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/gnus-topic
/home/dick/.emacs.d/elpa/hierarchy-20171221.1151/hierarchy hides /home/dick/.local/share/emacs/28.0.50/lisp/emacs-lisp/hierarchy
/home/dick/.emacs.d/elpa/gnus-5.14pre/nnir hides /home/dick/.local/share/emacs/28.0.50/lisp/obsolete/nnir
Features:
(shadow emacsbug supercite regi bbdb-message sendmail footnote nndoc
debbugs-gnu debbugs soap-client rng-xsd rng-dt rng-util xsd-regexp goto-addr
magit-extras mule-util magit-patch-changelog magit-patch magit-submodule
magit-obsolete magit-popup async-bytecomp async magit-blame magit-stash
magit-reflog magit-bisect magit-push magit-pull magit-fetch magit-clone
magit-remote magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status magit
magit-repos magit-apply magit-wip magit-log which-func imenu magit-diff
git-commit log-edit pcvs-util add-log magit-core magit-autorevert magit-margin
magit-transient magit-process with-editor vterm face-remap vterm-module term
ehelp eshell esh-cmd esh-ext esh-opt esh-proc esh-io esh-arg esh-module
esh-groups esh-util server magit-mode transient magit-git magit-section
magit-utils tramp-archive tramp-gvfs tramp-cache zeroconf ivy delsel colir
ivy-overlay ffap dumb-jump f vc-git vc vc-dispatcher bug-reference cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs shortdoc emms-source-file locate url-about url-dired help-fns
radix-tree jka-compr misearch multi-isearch url-queue smerge-mode diff
diff-mode qp sort smiley shr-color gnus-async gnus-ml gravatar dns mail-extr
gnus-notifications gnus-fun notifications gnus-kill gnus-dup disp-table
mm-archive utf-7 gnutls network-stream url-cache nntwitter nntwitter-api nnrss
nndiscourse benchmark rbenv nnhackernews nnfolder bbdb-gnus gnus-demon nntp
nnmairix nnml nnreddit gnus-topic url-http url-auth url-gw nsm request
autorevert filenotify virtualenvwrapper gud s dash json-rpc python tramp-sh
tramp tramp-loaddefs trampver tramp-integration files-x tramp-compat ls-lisp
gnus-score score-mode gnus-bcklg gnus-srvr gnus-cite anaphora bbdb-mua
bbdb-com crm bbdb bbdb-site timezone gnus-delay gnus-draft gnus-cache
gnus-agent gnus-msg nnselect gnus-search eieio-opt speedbar ezimage dframe
find-func gnus-art mm-uu mml2015 mm-view mml-smime smime dig gnus-sum shr svg
dom nndraft nnmh gnus-group mm-url gnus-undo use-package use-package-delight
use-package-diminish gnus-start gnus-dbus dbus xml gnus-cloud nnimap nnmail
mail-source imap rfc2104 utf7 netrc nnoo parse-time iso8601 gnus-spec gnus-int
gnus-range gnus-win paredit-ext paredit subed subed-vtt subed-srt subed-common
subed-mpv subed-debug subed-config dired-x inf-ruby ruby-mode smie company
haskell-interactive-mode haskell-presentation-mode haskell-process
haskell-session haskell-compile haskell-mode haskell-cabal haskell-utils
haskell-font-lock haskell-indentation haskell-string haskell-sort-imports
haskell-lexeme haskell-align-imports haskell-complete-module
haskell-ghc-support etags fileloop generator dabbrev haskell-customize hydra
lv use-package-ensure paren solarized-theme solarized-definitions projectile
skeleton ibuf-macs find-dired ibuf-ext ibuffer ibuffer-loaddefs grep gnus
message rx rmc puny dired dired-loaddefs rfc822 mml mml-sec epa epg epg-config
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader pcase nnheader gnus-util rmail rmail-loaddefs rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils time-date flx-ido flx
google-translate-default-ui google-translate-core-ui facemenu color ido
google-translate-core google-translate-tk google-translate-backend
use-package-bind-key bind-key auto-complete advice popup cus-edit pp cus-load
wid-edit ess-r-mode ess-r-flymake flymake-proc flymake warnings thingatpt
ess-r-xref xref ess-trns ess-r-package shell pcomplete ess-r-completion
ess-roxy ess-r-syntax ess-rd noutline outline easy-mmode hideshow ess-s-lang
ess-help ess-mode ess-inf project format-spec ess-tracebug ess ess-utils
ess-custom compile text-property-search comint ansi-color emms-player-mplayer
emms-player-simple emms emms-compat cl-extra help-mode use-package-core
derived hl-line winner ring edmacro kmacro finder-inf json-reformat-autoloads
json-snatcher-autoloads sml-mode-autoloads tornado-template-mode-autoloads
info package browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache json
subr-x map url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs
cl-lib iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment text-mode
elisp-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook help
simple abbrev obarray cl-preloaded nadvice button loaddefs faces cus-face
macroexp files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote threads
dbusbind inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process 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))
^ permalink raw reply related [flat|nested] 5+ messages in thread
* bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously
2021-08-05 16:46 bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously dick.r.chiang
@ 2021-08-06 11:27 ` Lars Ingebrigtsen
2021-08-06 12:15 ` dick
2021-08-06 13:09 ` dick
0 siblings, 2 replies; 5+ messages in thread
From: Lars Ingebrigtsen @ 2021-08-06 11:27 UTC (permalink / raw)
To: dick.r.chiang; +Cc: 49897
dick.r.chiang@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
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously
2021-08-06 11:27 ` Lars Ingebrigtsen
@ 2021-08-06 12:15 ` dick
2021-08-06 13:09 ` dick
1 sibling, 0 replies; 5+ messages in thread
From: dick @ 2021-08-06 12:15 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: 49897
Yes, this is much better. I wonder what came over me to obfuscate things like
that.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously
2021-08-06 11:27 ` Lars Ingebrigtsen
2021-08-06 12:15 ` dick
@ 2021-08-06 13:09 ` dick
2021-08-06 13:47 ` Lars Ingebrigtsen
1 sibling, 1 reply; 5+ messages in thread
From: dick @ 2021-08-06 13:09 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: 49897
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.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously
2021-08-06 13:09 ` dick
@ 2021-08-06 13:47 ` Lars Ingebrigtsen
0 siblings, 0 replies; 5+ messages in thread
From: Lars Ingebrigtsen @ 2021-08-06 13:47 UTC (permalink / raw)
To: dick; +Cc: 49897
dick <dick.r.chiang@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
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-08-06 13:47 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2021-08-05 16:46 bug#49897: 28.0.50; [PATCH] Make sense of url-retrieve-synchronously dick.r.chiang
2021-08-06 11:27 ` Lars Ingebrigtsen
2021-08-06 12:15 ` dick
2021-08-06 13:09 ` dick
2021-08-06 13:47 ` Lars Ingebrigtsen
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