[bug#49196] [PATCH v4 3/3] import: go: Improve error handling.

[zimoun <zimon.toutoune@gmail.com>]

* guix/import/go.scm (go-module->guix-package*): Handle errors.
(go-module-recursive-import): Remove 'guard'.
* guix/scripts/import/go.scm (guix-import-go): Adjust.
* tests/go.scm: Adjust.
---
 guix/import/go.scm         | 49 +++++++++++++++++++++++---------------
 guix/scripts/import/go.scm |  6 ++---
 tests/go.scm               |  2 +-
 3 files changed, 34 insertions(+), 23 deletions(-)

diff --git a/guix/import/go.scm b/guix/import/go.scm
index a2863c79ad..e7d8bc3959 100644
--- a/guix/import/go.scm
+++ b/guix/import/go.scm
@@ -5,7 +5,8 @@
 ;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2021 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
-;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
+;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
+;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -62,6 +63,7 @@
   #:use-module (web uri)
 
   #:export (go-module->guix-package
+            go-module->guix-package*
             go-module-recursive-import))
 
 ;;; Commentary:
@@ -631,7 +633,28 @@ hint: use one of the following available versions ~a\n"
          dependencies+versions
          dependencies))))
 
-(define go-module->guix-package* (memoize go-module->guix-package))
+(define go-module->guix-package*
+  (lambda args
+    ;; Disable output buffering so that the following warning gets printed
+    ;; consistently.
+    (setvbuf (current-error-port) 'none)
+    (let ((package-name (match args ((name _ ...) name))))
+      (guard (c ((http-get-error? c)
+                 (warning (G_ "Failed to import package ~s.
+reason: ~s could not be fetched: HTTP error ~a (~s).
+This package and its dependencies won't be imported.~%")
+                          package-name
+                          (uri->string (http-get-error-uri c))
+                          (http-get-error-code c)
+                          (http-get-error-reason c))
+                 (values #f '()))
+                (else
+                 (warning (G_ "Failed to import package ~s.
+reason: ~s.~%")
+                          package-name
+                          (exception-args c))
+                 (values #f '())))
+        (apply go-module->guix-package args)))))
 
 (define* (go-module-recursive-import package-name
                                      #:key (goproxy "https://proxy.golang.org")
@@ -642,22 +665,10 @@ hint: use one of the following available versions ~a\n"
    package-name
    #:repo->guix-package
    (lambda* (name #:key version repo)
-     ;; Disable output buffering so that the following warning gets printed
-     ;; consistently.
-     (setvbuf (current-error-port) 'none)
-     (guard (c ((http-get-error? c)
-                (warning (G_ "Failed to import package ~s.
-reason: ~s could not be fetched: HTTP error ~a (~s).
-This package and its dependencies won't be imported.~%")
-                         name
-                         (uri->string (http-get-error-uri c))
-                         (http-get-error-code c)
-                         (http-get-error-reason c))
-                (values #f '())))
-       (receive (package-sexp dependencies)
-           (go-module->guix-package* name #:goproxy goproxy
-                                     #:version version
-                                     #:pin-versions? pin-versions?)
-         (values package-sexp dependencies))))
+     (receive (package-sexp dependencies)
+         (go-module->guix-package* name #:goproxy goproxy
+                                   #:version version
+                                   #:pin-versions? pin-versions?)
+       (values package-sexp dependencies)))
    #:guix-name go-module->guix-package-name
    #:version version))
diff --git a/guix/scripts/import/go.scm b/guix/scripts/import/go.scm
index 74e8e60cce..071ecdb2ef 100644
--- a/guix/scripts/import/go.scm
+++ b/guix/scripts/import/go.scm
@@ -115,10 +115,10 @@ that are not yet in Guix"))
                (map package->definition*
                     (apply go-module-recursive-import arguments))
                ;; Single import.
-               (let ((sexp (apply go-module->guix-package arguments)))
+               (let ((sexp (apply go-module->guix-package* arguments)))
                  (unless sexp
-                   (leave (G_ "failed to download meta-data for module '~a'~%")
-                          module-name))
+                   (leave (G_ "failed to download meta-data for module '~a'.~%")
+                          name))
                  (package->definition* sexp))))))
       (()
        (leave (G_ "too few arguments~%")))
diff --git a/tests/go.scm b/tests/go.scm
index b088ab50d2..929a8b39d1 100644
--- a/tests/go.scm
+++ b/tests/go.scm
@@ -286,6 +286,6 @@ package.")
                               (nix-base32-string->bytevector
                                "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5")
                               #f)))
-                 (go-module->guix-package "github.com/go-check/check")))))))
+                 (go-module->guix-package* "github.com/go-check/check")))))))
 
 (test-end "go")
-- 
2.32.0