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authorLudovic Courtès <ludovic.courtes@inria.fr>2017-07-21 14:07:29 +0200
committerLudovic Courtès <ludo@gnu.org>2017-07-21 17:03:24 +0200
commit3d3e93b3f9cdf05f3dde07db45147f5919242fa2 (patch)
tree2b434ed8258cb43be92338087cae16284c47e6ee /guix
parent0cf9f9b1e3cff70e837ca5b0759acd0f94f38732 (diff)
substitute: Optimize hash-part-to-path conversion on non-200 responses.
Previously this operation was linear in the number of requests and involved costly calls to 'string-contains'. * guix/scripts/substitute.scm (fetch-narinfos)[hash-part->path]: New procedure. [handle-narinfo-response]: Use it for caching when CODE is not 200.
Diffstat (limited to 'guix')
-rwxr-xr-xguix/scripts/substitute.scm16
1 files changed, 13 insertions, 3 deletions
diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index 9348599193..c066016aa4 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -47,6 +47,7 @@
#:use-module (ice-9 format)
#:use-module (ice-9 ftw)
#:use-module (ice-9 binary-ports)
+ #:use-module (ice-9 vlist)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
@@ -609,6 +610,17 @@ if file doesn't exist, and the narinfo otherwise."
url (* 100. (/ done (length paths))))
(set! done (+ 1 done)))))
+ (define hash-part->path
+ (let ((mapping (fold (lambda (path result)
+ (vhash-cons (store-path-hash-part path) path
+ result))
+ vlist-null
+ paths)))
+ (lambda (hash)
+ (match (vhash-assoc hash mapping)
+ (#f #f)
+ ((_ . path) path)))))
+
(define (handle-narinfo-response request response port result)
(let* ((code (response-code response))
(len (response-content-length response))
@@ -627,9 +639,7 @@ if file doesn't exist, and the narinfo otherwise."
(if len
(get-bytevector-n port len)
(read-to-eof port))
- (cache-narinfo! url
- (find (cut string-contains <> hash-part) paths)
- #f
+ (cache-narinfo! url (hash-part->path hash-part) #f
(if (= 404 code)
ttl
%narinfo-transient-error-ttl))