02d62978f4
Partly fixes <https://bugs.gnu.org/47867>. Reported by Florian Pelz <pelzflorian@pelzflorian.de>. In GnuTLS up to 3.7.1 included, GNUTLS_E_AGAIN and GNUTLS_E_INTERRUPTED are not handled by 'write_to_session_record_port' and could be thrown at the caller. This patch works around that by dropping connections altogether and restarting when this happens. * guix/http-client.scm (false-if-networking-error): Swallow ERROR/AGAIN and ERROR/INTERRUPTED. * guix/scripts/substitute.scm (call-with-cached-connection): Likewise.
348 lines
14 KiB
Scheme
348 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
|
||
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
|
||
;;; Copyright © 2012, 2015 Free Software Foundation, Inc.
|
||
;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
|
||
;;;
|
||
;;; 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 http-client)
|
||
#:use-module (web uri)
|
||
#:use-module (web http)
|
||
#:use-module ((web client) #:hide (open-socket-for-uri))
|
||
#:use-module (web request)
|
||
#:use-module (web response)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-11)
|
||
#:use-module (srfi srfi-19)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-34)
|
||
#:use-module (srfi srfi-35)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 binary-ports)
|
||
#:use-module (rnrs bytevectors)
|
||
#:use-module (guix ui)
|
||
#:use-module (guix utils)
|
||
#:use-module (guix base64)
|
||
#:autoload (gcrypt hash) (sha256)
|
||
#:autoload (gnutls) (error/invalid-session error/again error/interrupted)
|
||
#:use-module ((guix build utils)
|
||
#:select (mkdir-p dump-port))
|
||
#:use-module ((guix build download)
|
||
#:select (open-socket-for-uri
|
||
(open-connection-for-uri
|
||
. guix:open-connection-for-uri)
|
||
resolve-uri-reference))
|
||
#:re-export (open-socket-for-uri)
|
||
#:export (&http-get-error
|
||
http-get-error?
|
||
http-get-error-uri
|
||
http-get-error-code
|
||
http-get-error-reason
|
||
|
||
http-fetch
|
||
http-multiple-get
|
||
|
||
%http-cache-ttl
|
||
http-fetch/cached))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; HTTP client portable among Guile versions, and with proper error condition
|
||
;;; reporting.
|
||
;;;
|
||
;;; Code:
|
||
|
||
;; HTTP GET error.
|
||
(define-condition-type &http-get-error &error
|
||
http-get-error?
|
||
(uri http-get-error-uri) ; URI
|
||
(code http-get-error-code) ; integer
|
||
(reason http-get-error-reason)) ; string
|
||
|
||
|
||
(define* (http-fetch uri #:key port (text? #f) (buffered? #t)
|
||
(open-connection guix:open-connection-for-uri)
|
||
(keep-alive? #f)
|
||
(verify-certificate? #t)
|
||
(headers '((user-agent . "GNU Guile")))
|
||
(log-port (current-error-port))
|
||
timeout)
|
||
"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. When BUFFERED? is #f, return an
|
||
unbuffered port, suitable for use in `filtered-port'. HEADERS is an alist of
|
||
extra HTTP headers.
|
||
|
||
When KEEP-ALIVE? is true, the connection is marked as 'keep-alive' and PORT is
|
||
not closed upon completion.
|
||
|
||
When VERIFY-CERTIFICATE? is true, verify HTTPS server certificates.
|
||
|
||
TIMEOUT specifies the timeout in seconds for connection establishment; when
|
||
TIMEOUT is #f, connection establishment never times out.
|
||
|
||
Write information about redirects to LOG-PORT.
|
||
|
||
Raise an '&http-get-error' condition if downloading fails."
|
||
(let loop ((uri (if (string? uri)
|
||
(string->uri uri)
|
||
uri)))
|
||
(let ((port (or port (open-connection uri
|
||
#:verify-certificate?
|
||
verify-certificate?
|
||
#:timeout timeout)))
|
||
(headers (match (uri-userinfo uri)
|
||
((? string? str)
|
||
(cons (cons 'Authorization
|
||
(string-append "Basic "
|
||
(base64-encode
|
||
(string->utf8 str))))
|
||
headers))
|
||
(_ headers))))
|
||
(unless (or buffered? (not (file-port? port)))
|
||
(setvbuf port 'none))
|
||
(let*-values (((resp data)
|
||
(http-get uri #:streaming? #t #:port port
|
||
#:keep-alive? keep-alive?
|
||
#:headers headers))
|
||
((code)
|
||
(response-code resp)))
|
||
(case code
|
||
((200)
|
||
(values data (response-content-length resp)))
|
||
((301 ; moved permanently
|
||
302 ; found (redirection)
|
||
303 ; see other
|
||
307 ; temporary redirection
|
||
308) ; permanent redirection
|
||
(let ((uri (resolve-uri-reference (response-location resp) uri)))
|
||
(close-port port)
|
||
(format log-port (G_ "following redirection to `~a'...~%")
|
||
(uri->string uri))
|
||
(loop uri)))
|
||
(else
|
||
(raise (condition (&http-get-error
|
||
(uri uri)
|
||
(code code)
|
||
(reason (response-reason-phrase resp)))
|
||
(&message
|
||
(message
|
||
(format
|
||
#f
|
||
(G_ "~a: HTTP download failed: ~a (~s)")
|
||
(uri->string uri) code
|
||
(response-reason-phrase resp))))))))))))
|
||
|
||
(define-syntax-rule (false-if-networking-error exp)
|
||
"Return #f if EXP triggers a network related exception as can occur when
|
||
reusing stale cached connections."
|
||
;; FIXME: Duplicated from 'with-cached-connection'.
|
||
(catch #t
|
||
(lambda ()
|
||
exp)
|
||
(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)
|
||
(memq (first args)
|
||
(list error/invalid-session
|
||
|
||
;; XXX: These two are not properly handled in
|
||
;; GnuTLS < 3.7.2, in
|
||
;; 'write_to_session_record_port'; see
|
||
;; <https://bugs.gnu.org/47867>.
|
||
error/again error/interrupted)))
|
||
(memq key
|
||
'(bad-response bad-header bad-header-component)))
|
||
#f
|
||
(apply throw key args)))))
|
||
|
||
(define* (http-multiple-get base-uri proc seed requests
|
||
#:key port (verify-certificate? #t)
|
||
(open-connection guix:open-connection-for-uri)
|
||
(keep-alive? #t)
|
||
(batch-size 1000))
|
||
"Send all of REQUESTS to the server at BASE-URI. Call PROC for each
|
||
response, passing it the request object, the response, a port from which to
|
||
read the response body, and the previous result, starting with SEED, à la
|
||
'fold'. Return the final result.
|
||
|
||
When PORT is specified, use it as the initial connection on which HTTP
|
||
requests are sent; otherwise call OPEN-CONNECTION to open a new connection for
|
||
a URI. When KEEP-ALIVE? is false, close the connection port before
|
||
returning."
|
||
(let connect ((port port)
|
||
(requests requests)
|
||
(result seed))
|
||
(define batch
|
||
(if (>= batch-size (length requests))
|
||
requests
|
||
(take requests batch-size)))
|
||
|
||
;; (format (current-error-port) "connecting (~a requests left)..."
|
||
;; (length requests))
|
||
(let ((p (or port (open-connection base-uri
|
||
#:verify-certificate?
|
||
verify-certificate?))))
|
||
;; For HTTPS, P is not a file port and does not support 'setvbuf'.
|
||
(when (file-port? p)
|
||
(setvbuf p 'block (expt 2 16)))
|
||
|
||
;; Send BATCH in a row.
|
||
;; XXX: Do our own caching to work around inefficiencies when
|
||
;; communicating over TLS: <http://bugs.gnu.org/22966>.
|
||
(let-values (((buffer get) (open-bytevector-output-port)))
|
||
;; Inherit the HTTP proxying property from P.
|
||
(set-http-proxy-port?! buffer (http-proxy-port? p))
|
||
|
||
(unless (false-if-networking-error
|
||
(begin
|
||
(for-each (cut write-request <> buffer) batch)
|
||
(put-bytevector p (get))
|
||
(force-output p)
|
||
#t))
|
||
;; If PORT becomes unusable, open a fresh connection and retry.
|
||
(close-port p) ; close the broken port
|
||
(connect #f requests result)))
|
||
|
||
;; Now start processing responses.
|
||
(let loop ((sent batch)
|
||
(processed 0)
|
||
(result result))
|
||
(match sent
|
||
(()
|
||
(match (drop requests processed)
|
||
(()
|
||
(unless keep-alive?
|
||
(close-port p))
|
||
(reverse result))
|
||
(remainder
|
||
(connect p remainder result))))
|
||
((head tail ...)
|
||
(match (false-if-networking-error (read-response p))
|
||
((? response? resp)
|
||
(let* ((body (response-body-port resp))
|
||
(result (proc head resp body result)))
|
||
;; The server can choose to stop responding at any time,
|
||
;; in which case we have to try again. Check whether
|
||
;; that is the case. Note that even upon "Connection:
|
||
;; close", we can read from BODY.
|
||
(match (assq 'connection (response-headers resp))
|
||
(('connection 'close)
|
||
(close-port p)
|
||
(connect #f ;try again
|
||
(drop requests (+ 1 processed))
|
||
result))
|
||
(_
|
||
(loop tail (+ 1 processed) result)))))
|
||
(#f
|
||
(close-port p)
|
||
(connect #f ; try again
|
||
(drop requests processed)
|
||
result)))))))))
|
||
|
||
|
||
;;;
|
||
;;; Caching.
|
||
;;;
|
||
|
||
(define %http-cache-ttl
|
||
;; Time-to-live in seconds of the HTTP cache of in ~/.cache/guix.
|
||
(make-parameter
|
||
(* 3600 (or (and=> (getenv "GUIX_HTTP_CACHE_TTL")
|
||
string->number*)
|
||
36))))
|
||
|
||
(define (cache-file-for-uri uri)
|
||
"Return the name of the file in the cache corresponding to URI."
|
||
(let ((digest (sha256 (string->utf8 (uri->string uri)))))
|
||
;; Use the "URL" alphabet because it does not contain "/".
|
||
(string-append (cache-directory) "/http/"
|
||
(base64-encode digest 0 (bytevector-length digest)
|
||
#f #f base64url-alphabet))))
|
||
|
||
(define* (http-fetch/cached uri #:key (ttl (%http-cache-ttl)) text?
|
||
(write-cache dump-port)
|
||
(cache-miss (const #t))
|
||
(log-port (current-error-port))
|
||
(timeout 10))
|
||
"Like 'http-fetch', return an input port, but cache its contents in
|
||
~/.cache/guix. The cache remains valid for TTL seconds.
|
||
|
||
Call WRITE-CACHE with the HTTP input port and the cache output port to write
|
||
the data to cache. Call CACHE-MISS with URI just before fetching data from
|
||
URI.
|
||
|
||
TIMEOUT specifies the timeout in seconds for connection establishment.
|
||
|
||
Write information about redirects to LOG-PORT."
|
||
(let ((file (cache-file-for-uri uri)))
|
||
(define (update-cache cache-port)
|
||
(define cache-time
|
||
(and cache-port
|
||
(stat:mtime (stat cache-port))))
|
||
|
||
(define headers
|
||
`((user-agent . "GNU Guile")
|
||
,@(if cache-time
|
||
`((if-modified-since
|
||
. ,(time-utc->date (make-time time-utc 0 cache-time))))
|
||
'())))
|
||
|
||
;; Update the cache and return an input port.
|
||
(guard (c ((http-get-error? c)
|
||
(if (= 304 (http-get-error-code c)) ;"Not Modified"
|
||
(begin
|
||
(utime file) ;update FILE's mtime
|
||
cache-port)
|
||
(raise c))))
|
||
(let ((port (http-fetch uri #:text? text?
|
||
#:log-port log-port
|
||
#:headers headers #:timeout timeout)))
|
||
(cache-miss uri)
|
||
(mkdir-p (dirname file))
|
||
(when cache-port
|
||
(close-port cache-port))
|
||
(with-atomic-file-output file
|
||
(cut write-cache port <>))
|
||
(close-port port)
|
||
(open-input-file file))))
|
||
|
||
(define (old? port)
|
||
;; Return true if PORT has passed TTL.
|
||
(let* ((s (stat port))
|
||
(now (current-time time-utc)))
|
||
(< (+ (stat:mtime s) ttl) (time-second now))))
|
||
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(let ((port (open-input-file file)))
|
||
(if (old? port)
|
||
(update-cache port)
|
||
port)))
|
||
(lambda args
|
||
(if (= ENOENT (system-error-errno args))
|
||
(update-cache #f)
|
||
(apply throw args))))))
|
||
|
||
;;; http-client.scm ends here
|