[bug#53818] [PATCH v2 4/7] import: json: Make 'json-fetch' take '#:cached?' argument.

[Xinglu Chen]

* json.scm (json-fetch): Add ‘#:cached?’ keyword argument.
---
 guix/import/json.scm | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/guix/import/json.scm b/guix/import/json.scm
index 0c98bb25b8..6f88353659 100644
--- a/guix/import/json.scm
+++ b/guix/import/json.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2015, 2016 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2020 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2022 Xinglu Chen <public@yoctocell.xyz>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -37,17 +38,22 @@ (define-module (guix import json)
 (define* (json-fetch url
                      ;; Note: many websites returns 403 if we omit a
                      ;; 'User-Agent' header.
-                     #:key (headers `((user-agent . "GNU Guile")
-                                      (Accept . "application/json"))))
+                     #:key
+                     (headers `((user-agent . "GNU Guile")
+                                (Accept . "application/json")))
+                     cached?)
   "Return a representation of the JSON resource URL (a list or hash table), or
 #f if URL returns 403 or 404.  HEADERS is a list of HTTP headers to pass in
-the query."
+the query.  If CACHED? is #t, 'http-fetch/cached' will be used to fetch URL."
   (guard (c ((and (http-get-error? c)
                   (let ((error (http-get-error-code c)))
                     (or (= 403 error)
                         (= 404 error))))
              #f))
-    (let* ((port   (http-fetch url #:headers headers))
+    (let* ((port   ((if cached?
+                        http-fetch/cached
+                        http-fetch)
+                    url #:headers headers))
            (result (json->scm port)))
       (close-port port)
       result)))
-- 
2.34.1