From: Christopher Baines <mail@cbaines.net>
To: 45409@debbugs.gnu.org
Subject: [bug#45409] [PATCH v5 14/14] substitute: Rework connection error handling.
Date: Sat, 13 Feb 2021 13:47:19 +0000 [thread overview]
Message-ID: <20210213134719.19625-14-mail@cbaines.net> (raw)
In-Reply-To: <20210213134719.19625-1-mail@cbaines.net>
This is part of trying to reduce the interdependency of code within the
substitute module.
This commit addresses some of the error handling that was performed through
open-connection-for-uri/maybe. The new approach is to use
call-with-connection-error-handling, and wrap calls to http-multiple-get and
http-fetch with that procedure, which takes care of handling connection
errors.
I think this is even slightly more rigerous than the previous setup, because
this approach handles connection errors that occur when http-multiple-get
reconnects to a host.
* guix/scripts/substitute.scm (open-connection-for-uri/maybe): Transform in to
call-with-connection-error-handling.
(fetch-narinfos): Use call-with-connection-error-handling.
(process-query): Replace open-connection-for-uri/maybe with
open-connection-for-uri/cached.
(open-connection-for-uri/cached): Set a default timeout, matching the
behaviour in open-connection-for-uri/maybe.
(process-substitution): Use call-with-connection-error-handling.
---
guix/scripts/substitute.scm | 47 +++++++++++++++++--------------------
1 file changed, 22 insertions(+), 25 deletions(-)
diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index fea2cecef0..a3a0349530 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -281,22 +281,13 @@ if file doesn't exist, and the narinfo otherwise."
;; Set of names of unreachable hosts.
(make-hash-table))
-(define* (open-connection-for-uri/maybe uri
- #:key
- fresh?
- (time %fetch-timeout)
- verify-certificate?)
- "Open a connection to URI via 'open-connection-for-uri/cached' and return a
-port to it, or, if connection failed, print a warning and return #f. Pass
-#:fresh? to 'open-connection-for-uri/cached'."
+(define* (call-with-connection-error-handling uri proc)
+ "Call PROC, and catch if a connection fails, print a warning and return #f."
(define host
(uri-host uri))
(catch #t
- (lambda ()
- (open-connection-for-uri/cached uri #:timeout time
- #:fresh? fresh?
- #:verify-certificate? verify-certificate?))
+ proc
(match-lambda*
(('getaddrinfo-error error)
(unless (hash-ref %unreachable-hosts host)
@@ -377,11 +368,14 @@ port to it, or, if connection failed, print a warning and return #f. Pass
(let* ((requests (map (cut narinfo-request url <>) paths))
(result (begin
(update-progress!)
- (http-multiple-get uri
- handle-narinfo-response '()
- requests
- #:open-connection open-connection
- #:verify-certificate? #f))))
+ (call-with-connection-error-handling
+ uri
+ (lambda ()
+ (http-multiple-get uri
+ handle-narinfo-response '()
+ requests
+ #:open-connection open-connection
+ #:verify-certificate? #f))))))
(newline (current-error-port))
result))
((file #f)
@@ -595,7 +589,7 @@ authorized substitutes."
;; Return the subset of PATHS available in CACHE-URLS.
(let ((substitutable (lookup-narinfos/diverse
cache-urls paths valid?
- #:open-connection open-connection-for-uri/maybe)))
+ #:open-connection open-connection-for-uri/cached)))
(for-each (lambda (narinfo)
(format #t "~a~%" (narinfo-path narinfo)))
substitutable)
@@ -604,7 +598,7 @@ authorized substitutes."
;; Reply info about PATHS if it's in CACHE-URLS.
(let ((substitutable (lookup-narinfos/diverse
cache-urls paths valid?
- #:open-connection open-connection-for-uri/maybe)))
+ #:open-connection open-connection-for-uri/cached)))
(for-each display-narinfo-data substitutable)
(newline)))
(wtf
@@ -617,7 +611,7 @@ authorized substitutes."
(define open-connection-for-uri/cached
(let ((cache '()))
- (lambda* (uri #:key fresh? timeout verify-certificate?)
+ (lambda* (uri #:key fresh? (timeout %fetch-timeout) verify-certificate?)
"Return a connection for URI, possibly reusing a cached connection.
When FRESH? is true, delete any cached connections for URI and open a new one.
Return #f if URI's scheme is 'file' or #f.
@@ -704,11 +698,14 @@ the current output port."
(warning (G_ "while fetching ~a: server is somewhat slow~%")
(uri->string uri))
(warning (G_ "try `--no-substitutes' if the problem persists~%")))
- (http-fetch uri #:text? #f
- #:open-connection open-connection-for-uri/maybe
- #:keep-alive? #t
- #:buffered? #f
- #:verify-certificate? #f))))
+ (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))))))
(else
(leave (G_ "unsupported substitute URI scheme: ~a~%")
(uri->string uri)))))
--
2.30.0
next prev parent reply other threads:[~2021-02-13 13:49 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-24 17:17 [bug#45409] [PATCH 0/3] Move some (guix scripts substitute) code to two new modules Christopher Baines
2020-12-24 17:22 ` [bug#45409] [PATCH 1/3] guix: Move narinfo code from substitute script to module Christopher Baines
2020-12-24 17:22 ` [bug#45409] [PATCH 2/3] guix: Untangle (guix narinfo) from (guix scripts substitute) Christopher Baines
2020-12-24 17:22 ` [bug#45409] [PATCH 3/3] guix: Split (guix substitute) " Christopher Baines
2021-01-03 15:08 ` Ludovic Courtès
2021-01-03 18:19 ` Christopher Baines
2021-01-03 15:03 ` [bug#45409] [PATCH 1/3] guix: Move narinfo code from substitute script to module Ludovic Courtès
2021-01-03 18:16 ` Christopher Baines
2021-01-04 21:24 ` Christopher Baines
2021-01-03 17:59 ` [bug#45409] [PATCH v2 1/3] substitute: Untangle skipping authentication from valid-narinfo? Christopher Baines
2021-01-03 17:59 ` [bug#45409] [PATCH v2 2/3] guix: Move narinfo code from substitute script to module Christopher Baines
2021-01-03 17:59 ` [bug#45409] [PATCH v2 3/3] guix: Split (guix substitutes) from (guix scripts substitute) Christopher Baines
2021-01-04 21:19 ` [bug#45409] [PATCH v3 1/3] substitute: Untangle skipping authentication from valid-narinfo? Christopher Baines
2021-01-04 21:19 ` [bug#45409] [PATCH v3 2/3] guix: Move narinfo code from substitute script to module Christopher Baines
2021-01-05 21:58 ` Ludovic Courtès
2021-01-04 21:19 ` [bug#45409] [PATCH v3 3/3] guix: Split (guix substitutes) from (guix scripts substitute) Christopher Baines
2021-01-05 22:03 ` Ludovic Courtès
2021-01-07 22:29 ` Christopher Baines
2021-01-11 13:26 ` Ludovic Courtès
2021-01-16 14:18 ` Christopher Baines
2021-02-13 13:56 ` Christopher Baines
2021-02-22 22:21 ` Christopher Baines
2021-02-23 20:46 ` Christopher Baines
2021-01-05 21:57 ` [bug#45409] [PATCH v3 1/3] substitute: Untangle skipping authentication from valid-narinfo? Ludovic Courtès
2021-01-05 22:58 ` Christopher Baines
2021-01-06 8:37 ` Ludovic Courtès
2021-01-16 13:57 ` [bug#45409] [PATCH v4 01/13] substitute: Remove buffer handling from fetch Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 02/13] substitute: Remove connection " Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 03/13] substitute: Remove redundant let block " Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 04/13] guix: Move http-multiple-get to (guix http-client) Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 05/13] http-client: Add error handling to http-multiple-get Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 06/13] substitute: open-connection-for-uri/maybe add #:verify-certificate? Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 07/13] substitute: Stop using call-with-cached-connection in fetch-narinfos Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 08/13] http-client: Accept #:open-connection in http-fetch Christopher Baines
2021-01-16 13:57 ` [bug#45409] [PATCH v4 09/13] substitute: Change connection cache handling in process-substitution Christopher Baines
2021-01-16 13:58 ` [bug#45409] [PATCH v4 10/13] substitute: Remove now redundant connection caching helpers Christopher Baines
2021-01-16 13:58 ` [bug#45409] [PATCH v4 11/13] substitute: Remove redundant fetch arguments Christopher Baines
2021-01-16 13:58 ` [bug#45409] [PATCH v4 12/13] substitute: Inline fetch in to process-substitutes Christopher Baines
2021-01-16 13:58 ` [bug#45409] [PATCH v4 13/13] substitute: Remove fetch-narinfos use open-connection-for-uri/maybe Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 01/14] substitute: Remove buffer handling from fetch Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 02/14] substitute: Remove connection " Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 03/14] substitute: Remove redundant let block " Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 04/14] guix: Move http-multiple-get to (guix http-client) Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 05/14] http-client: Add error handling to http-multiple-get Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 06/14] substitute: open-connection-for-uri/maybe add #:verify-certificate? Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 07/14] substitute: Stop using call-with-cached-connection in fetch-narinfos Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 08/14] http-client: Accept #:open-connection in http-fetch Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 09/14] substitute: Change connection cache handling in process-substitution Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 10/14] substitute: Remove now redundant connection caching helpers Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 11/14] substitute: Remove redundant fetch arguments Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 12/14] substitute: Inline fetch in to process-substitutes Christopher Baines
2021-02-13 13:47 ` [bug#45409] [PATCH v5 13/14] substitute: Remove fetch-narinfos use open-connection-for-uri/maybe Christopher Baines
2021-02-13 13:47 ` Christopher Baines [this message]
2021-02-23 19:59 ` [bug#45409] [PATCH 1/2] guix: Split (guix substitutes) from (guix scripts substitute) Christopher Baines
2021-02-23 19:59 ` [bug#45409] [PATCH 2/2] substitute: Print backtraces to (current-error-port) Christopher Baines
2021-03-06 0:57 ` bug#45409: [PATCH 0/3] Move some (guix scripts substitute) code to two new modules Christopher Baines
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