From: Christopher Baines <mail@cbaines.net>
To: 47160@debbugs.gnu.org
Subject: [bug#47160] [PATCH v2 1/2] scripts: substitute: Add back some error handling.
Date: Mon, 15 Mar 2021 16:15:31 +0000 [thread overview]
Message-ID: <20210315161532.1716-1-mail@cbaines.net> (raw)
In-Reply-To: <20210315151133.16282-1-mail@cbaines.net>
In f50f5751fff4cfc6d5abba9681054569694b7a5c, the way fetch was called within
process-substitution was changed. As with-cached-connection actually includes
important error handling for the opening of a HTTP request (when using a
cached connection), this change removed some error handling.
This commit adds that error handling back,
(call-)with-cached-connection is back, rebranded as
call-with-cached-connection-and-error-handling.
* guix/scripts/substitute.scm (process-substitution): Retry once for some
errors when making HTTP requests to fetch substitutes.
---
guix/scripts/substitute.scm | 38 ++++++++++++++++++++++++++++++++-----
1 file changed, 33 insertions(+), 5 deletions(-)
diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index 6892aa999b..16ba28455f 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -45,6 +45,7 @@
#:select (uri-abbreviation nar-uri-abbreviation
(open-connection-for-uri
. guix:open-connection-for-uri)))
+ #:autoload (gnutls) (error/invalid-session)
#:use-module (guix progress)
#:use-module ((guix build syscalls)
#:select (set-thread-name))
@@ -377,6 +378,31 @@ server certificates."
(drain-input socket)
socket))))))))
+(define (call-with-cached-connection-and-error-handling uri proc)
+ (define (get-port)
+ (open-connection-for-uri/cached uri
+ #:verify-certificate? #f))
+
+ (let ((port (get-port)))
+ (catch #t
+ (lambda ()
+ (proc port))
+ (lambda (key . args)
+ ;; If PORT was cached and the server closed the connection in the
+ ;; meantime, we get EPIPE. In that case, open a fresh connection
+ ;; and retry. We might also get 'bad-response or a similar
+ ;; exception from (web response) later on, once we've sent the
+ ;; request, or a ERROR/INVALID-SESSION from GnuTLS.
+ (if (or (and (eq? key 'system-error)
+ (= EPIPE (system-error-errno `(,key ,@args))))
+ (and (eq? key 'gnutls-error)
+ (eq? (first args) error/invalid-session))
+ (memq key '(bad-response bad-header bad-header-component)))
+ (begin
+ (close-port port) ; close the port to get a fresh one
+ (proc (get-port)))
+ (apply throw key args))))))
+
(define* (process-substitution store-item destination
#:key cache-urls acl
deduplicate? print-build-trace?)
@@ -424,11 +450,13 @@ the current output port."
(call-with-connection-error-handling
uri
(lambda ()
- (http-fetch uri #:text? #f
- #:open-connection open-connection-for-uri/cached
- #:keep-alive? #t
- #:buffered? #f
- #:verify-certificate? #f))))))
+ (call-with-cached-connection-and-error-handling
+ uri
+ (lambda (port)
+ (http-fetch uri #:text? #f
+ #:port port
+ #:keep-alive? #t
+ #:buffered? #f))))))))
(else
(leave (G_ "unsupported substitute URI scheme: ~a~%")
(uri->string uri)))))
--
2.30.1
next prev parent reply other threads:[~2021-03-15 16:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 15:11 [bug#47160] [PATCH] scripts: substitute: Add back some error handling Christopher Baines
2021-03-15 15:20 ` Ludovic Courtès
2021-03-15 16:15 ` Christopher Baines
2021-03-15 20:51 ` Ludovic Courtès
2021-03-15 21:33 ` Christopher Baines
2021-03-16 20:34 ` Ludovic Courtès
2021-03-15 16:15 ` Christopher Baines [this message]
2021-03-15 16:15 ` [bug#47160] [PATCH v2 2/2] scripts: substitute: Tweak error reporting in process-substitution Christopher Baines
2021-03-16 21:30 ` [bug#47160] [PATCH] scripts: substitute: Add back some error handling Ludovic Courtès
2021-03-16 23:11 ` Christopher Baines
2021-03-16 23:46 ` [bug#47160] [PATCH 1/2] " Christopher Baines
2021-03-16 23:46 ` [bug#47160] [PATCH 2/2] scripts: substitute: Tweak error reporting in process-substitution Christopher Baines
2021-03-17 20:18 ` [bug#47160] [PATCH] scripts: substitute: Add back some error handling Ludovic Courtès
2021-03-17 20:46 ` bug#47160: " Christopher Baines
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