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publish: Remove "Guix-Nar-Compression" header from responses.

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This was harmless but non-compliant and unnecessary.

* guix/scripts/publish.scm <top level>: Rename "Guix-Nar-Compression" to
"X-Nar-Compression" as should have always been.
(render-nar, nar-response-port): Adjust accordingly.
(strip-headers): New procedure.
(sans-content-length, with-content-length): Use it.
This commit is contained in:
Ludovic Courtès 2018-01-09 22:38:47 +01:00
parent b0de7fdba6
commit 297e04d660
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GPG key ID: 090B11993D9AEBB5
1 changed files with 12 additions and 10 deletions
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22
guix/scripts/publish.scm
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@ -505,10 +505,10 @@ (define* (bake-narinfo+nar cache item
stat:size))
port))))))
;; XXX: Declare the 'Guix-Compression' HTTP header, which is in fact for
;; XXX: Declare the 'X-Nar-Compression' HTTP header, which is in fact for
;; internal consumption: it allows us to pass the compression info to
;; 'http-write', as part of the workaround to <http://bugs.gnu.org/21093>.
(declare-header! "Guix-Nar-Compression"
(declare-header! "X-Nar-Compression"
(lambda (str)
(match (call-with-input-string str read)
(('compression type level)
@ -529,7 +529,7 @@ (define* (render-nar store request store-item
(if (valid-path? store store-path)
(values `((content-type . (application/x-nix-archive
(charset . "ISO-8859-1")))
(guix-nar-compression . ,compression))
(x-nar-compression . ,compression))
;; XXX: We're not returning the actual contents, deferring
;; instead to 'http-write'. This is a hack to work around
;; <http://bugs.gnu.org/21093>.
@ -638,20 +638,22 @@ (define (request-path-components request)
(define %http-write
(@@ (web server http) http-write))
(define (strip-headers response)
"Return RESPONSE's headers minus 'Content-Length' and our internal headers."
(fold alist-delete
(response-headers response)
'(content-length x-raw-file x-nar-compression)))
(define (sans-content-length response)
"Return RESPONSE without its 'content-length' header."
(set-field response (response-headers)
(alist-delete 'content-length
(response-headers response)
eq?)))
(strip-headers response)))
(define (with-content-length response length)
"Return RESPONSE with a 'content-length' header set to LENGTH."
(set-field response (response-headers)
(alist-cons 'content-length length
(fold alist-delete
(response-headers response)
'(content-length x-raw-file)))))
(strip-headers response))))
(define-syntax-rule (swallow-EPIPE exp ...)
"Swallow EPIPE errors raised by EXP..."
@ -673,7 +675,7 @@ (define-syntax-rule (swallow-zlib-error exp ...)
(define (nar-response-port response)
"Return a port on which to write the body of RESPONSE, the response of a
/nar request, according to COMPRESSION."
(match (assoc-ref (response-headers response) 'guix-nar-compression)
(match (assoc-ref (response-headers response) 'x-nar-compression)
(($ <compression> 'gzip level)
;; Note: We cannot used chunked encoding here because
;; 'make-gzip-output-port' wants a file port.