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web: Factorize `http-get' hackery.

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This should fix `substitute-binary --query' on Guile 2.0.5.

* guix/web.scm: New file.
* Makefile.am (MODULES): Add it.
* po/POTFILES.in: Add it.
* guix/gnu-maintenance.scm (http-fetch): Remove.
  (%package-list-url): Turn into a URI.
  (official-gnu-packages): Add #:text? #t to `http-fetch' call.
* guix/scripts/substitute-binary.scm (fetch): Remove `http' case, and
  use `http-fetch' instead.
This commit is contained in:
Ludovic Courtès 2013-04-25 22:06:48 +02:00
parent 9e623d068d
commit 1c9e7d65d4
5 changed files with 95 additions and 63 deletions
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1
Makefile.am
View file

@ -48,6 +48,7 @@ MODULES = \
guix/build-system/perl.scm \
guix/build-system/trivial.scm \
guix/ftp-client.scm \
guix/web.scm \
guix/gnupg.scm \
guix/store.scm \
guix/ui.scm \

45
guix/gnu-maintenance.scm
View file

@ -28,6 +28,7 @@ (define-module (guix gnu-maintenance)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (system foreign)
#:use-module (guix web)
#:use-module (guix ftp-client)
#:use-module (guix ui)
#:use-module (guix utils)
@ -73,45 +74,11 @@ (define-module (guix gnu-maintenance)
;;; List of GNU packages.
;;;
(define (http-fetch uri)
"Return an input port containing the textual data at URI, a string."
(let*-values (((resp data)
(let ((uri (string->uri uri)))
;; Try hard to use the API du jour to get an input port.
(if (version>? "2.0.7" (version))
(if (defined? 'http-get*)
(http-get* uri)
(http-get uri)) ; old Guile, returns a string
(http-get uri #:streaming? #t)))) ; 2.0.8 or later
((code)
(response-code resp)))
(case code
((200)
(cond ((not data)
(begin
;; XXX: Guile 2.0.5 and earlier did not support chunked transfer
;; encoding, which is required when fetching %PACKAGE-LIST-URL
;; (see <http://lists.gnu.org/archive/html/guile-devel/2011-09/msg00089.html>).
;; Since users may still be using these versions, warn them and
;; bail out.
(warning (_ "using Guile ~a, ~a ~s encoding~%")
(version)
"which does not support HTTP"
(response-transfer-encoding resp))
(leave (_ "download failed; use a newer Guile~%")
uri resp)))
((string? data) ; old `http-get' returns a string
(open-input-string data))
(else ; input port
data)))
(else
(error "download failed" uri code
(response-reason-phrase resp))))))
(define %package-list-url
(string-append "http://cvs.savannah.gnu.org/"
"viewvc/*checkout*/gnumaint/"
"gnupackages.txt?root=womb"))
(string->uri
(string-append "http://cvs.savannah.gnu.org/"
"viewvc/*checkout*/gnumaint/"
"gnupackages.txt?root=womb")))
(define-record-type* <gnu-package-descriptor>
gnu-package-descriptor
@ -197,7 +164,7 @@ (define (alist->record alist make keys)
"savannah" "fsd" "language" "logo"
"doc-category" "doc-summary" "doc-urls"
"download-url")))
(group-package-fields (http-fetch %package-list-url)
(group-package-fields (http-fetch %package-list-url #:text? #t)
'(())))))
(define (find-packages regexp)

26
guix/scripts/substitute-binary.scm
View file

@ -35,8 +35,7 @@ (define-module (guix scripts substitute-binary)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (guix web)
#:export (guix-substitute-binary))
;;; Comment:
@ -128,28 +127,7 @@ (define (fetch uri)
(let ((port (open-input-file (uri-path uri))))
(values port (stat:size (stat port)))))
((http)
(let*-values (((resp port)
;; XXX: `http-get*' was introduced in 2.0.7, and deprecated
;; in 2.0.8 (!). Assume it is available here.
(if (version>? "2.0.7" (version))
(http-get* uri #:decode-body? #f)
(http-get uri #:streaming? #t)))
((code)
(response-code resp))
((size)
(response-content-length resp)))
(case code
((200) ; OK
(values port size))
((301 ; moved permanently
302) ; found (redirection)
(let ((uri (response-location resp)))
(format #t "following redirection to `~a'...~%"
(uri->string uri))
(fetch uri)))
(else
(error "download failed" (uri->string uri)
code (response-reason-phrase resp))))))))
(http-fetch uri #:text? #f))))
(define-record-type <cache>
(%make-cache url store-directory wants-mass-query?)

85
guix/web.scm Normal file
View file

@ -0,0 +1,85 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix web)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (srfi srfi-11)
#:use-module (rnrs io ports)
#:use-module (rnrs bytevectors)
#:use-module (guix ui)
#:use-module (guix utils)
#:export (http-fetch))
;;; Commentary:
;;;
;;; Web client portable among Guile versions.
;;;
;;; Code:
(define* (http-fetch uri #:key (text? #f))
"Return an input port containing the data at URI, and the expected number of
bytes available or #f. If TEXT? is true, the data at URI is considered to be
textual. Follow any HTTP redirection."
(let loop ((uri uri))
(let*-values (((resp data)
;; Try hard to use the API du jour to get an input port.
;; On Guile 2.0.5 and before, we can only get a string or
;; bytevector, and not an input port. Work around that.
(if (version>? "2.0.7" (version))
(if (defined? 'http-get*)
(http-get* uri #:decode-body? text?) ; 2.0.7
(http-get uri #:decode-body? text?)) ; 2.0.5-
(http-get uri #:streaming? #t))) ; 2.0.9+
((code)
(response-code resp)))
(case code
((200)
(let ((len (response-content-length resp)))
(cond ((not data)
(begin
;; XXX: Guile 2.0.5 and earlier did not support chunked
;; transfer encoding, which is required for instance when
;; fetching %PACKAGE-LIST-URL (see
;; <http://lists.gnu.org/archive/html/guile-devel/2011-09/msg00089.html>).
;; Since users may still be using these versions, warn them
;; and bail out.
(warning (_ "using Guile ~a, ~a ~s encoding~%")
(version)
"which does not support HTTP"
(response-transfer-encoding resp))
(leave (_ "download failed; use a newer Guile~%")
uri resp)))
((string? data) ; `http-get' from 2.0.5-
(values (open-input-string data) len))
((bytevector? data) ; likewise
(values (open-bytevector-input-port data) len))
(else ; input port
(values data len)))))
((301 ; moved permanently
302) ; found (redirection)
(let ((uri (response-location resp)))
(format #t "following redirection to `~a'...~%"
(uri->string uri))
(loop uri)))
(else
(error "download failed" uri code
(response-reason-phrase resp)))))))
;;; web.scm ends here

1
po/POTFILES.in
View file

@ -12,3 +12,4 @@ guix/scripts/hash.scm
guix/scripts/pull.scm
guix/gnu-maintenance.scm
guix/ui.scm
guix/web.scm